git.oblomov.eu Git - git/blob - builtin/fast-import.c

   1 #include "builtin.h"
   2 #include "cache.h"
   3 #include "repository.h"
   4 #include "config.h"
   5 #include "lockfile.h"
   6 #include "object.h"
   7 #include "blob.h"
   8 #include "tree.h"
   9 #include "commit.h"
  10 #include "delta.h"
  11 #include "pack.h"
  12 #include "refs.h"
  13 #include "csum-file.h"
  14 #include "quote.h"
  15 #include "dir.h"
  16 #include "run-command.h"
  17 #include "packfile.h"
  18 #include "object-store.h"
  19 #include "mem-pool.h"
  20 #include "commit-reach.h"
  21 #include "khash.h"
  22
  23 #define PACK_ID_BITS 16
  24 #define MAX_PACK_ID ((1<<PACK_ID_BITS)-1)
  25 #define DEPTH_BITS 13
  26 #define MAX_DEPTH ((1<<DEPTH_BITS)-1)
  27
  28 /*
  29  * We abuse the setuid bit on directories to mean "do not delta".
  30  */
  31 #define NO_DELTA S_ISUID
  32
  33 /*
  34  * The amount of additional space required in order to write an object into the
  35  * current pack. This is the hash lengths at the end of the pack, plus the
  36  * length of one object ID.
  37  */
  38 #define PACK_SIZE_THRESHOLD (the_hash_algo->rawsz * 3)
  39
  40 struct object_entry {
  41         struct pack_idx_entry idx;
  42         struct hashmap_entry ent;
  43         uint32_t type : TYPE_BITS,
  44                 pack_id : PACK_ID_BITS,
  45                 depth : DEPTH_BITS;
  46 };
  47
  48 static int object_entry_hashcmp(const void *map_data,
  49                                 const struct hashmap_entry *eptr,
  50                                 const struct hashmap_entry *entry_or_key,
  51                                 const void *keydata)
  52 {
  53         const struct object_id *oid = keydata;
  54         const struct object_entry *e1, *e2;
  55
  56         e1 = container_of(eptr, const struct object_entry, ent);
  57         if (oid)
  58                 return oidcmp(&e1->idx.oid, oid);
  59
  60         e2 = container_of(entry_or_key, const struct object_entry, ent);
  61         return oidcmp(&e1->idx.oid, &e2->idx.oid);
  62 }
  63
  64 struct object_entry_pool {
  65         struct object_entry_pool *next_pool;
  66         struct object_entry *next_free;
  67         struct object_entry *end;
  68         struct object_entry entries[FLEX_ARRAY]; /* more */
  69 };
  70
  71 struct mark_set {
  72         union {
  73                 struct object_id *oids[1024];
  74                 struct object_entry *marked[1024];
  75                 struct mark_set *sets[1024];
  76         } data;
  77         unsigned int shift;
  78 };
  79
  80 struct last_object {
  81         struct strbuf data;
  82         off_t offset;
  83         unsigned int depth;
  84         unsigned no_swap : 1;
  85 };
  86
  87 struct atom_str {
  88         struct atom_str *next_atom;
  89         unsigned short str_len;
  90         char str_dat[FLEX_ARRAY]; /* more */
  91 };
  92
  93 struct tree_content;
  94 struct tree_entry {
  95         struct tree_content *tree;
  96         struct atom_str *name;
  97         struct tree_entry_ms {
  98                 uint16_t mode;
  99                 struct object_id oid;
 100         } versions[2];
 101 };
 102
 103 struct tree_content {
 104         unsigned int entry_capacity; /* must match avail_tree_content */
 105         unsigned int entry_count;
 106         unsigned int delta_depth;
 107         struct tree_entry *entries[FLEX_ARRAY]; /* more */
 108 };
 109
 110 struct avail_tree_content {
 111         unsigned int entry_capacity; /* must match tree_content */
 112         struct avail_tree_content *next_avail;
 113 };
 114
 115 struct branch {
 116         struct branch *table_next_branch;
 117         struct branch *active_next_branch;
 118         const char *name;
 119         struct tree_entry branch_tree;
 120         uintmax_t last_commit;
 121         uintmax_t num_notes;
 122         unsigned active : 1;
 123         unsigned delete : 1;
 124         unsigned pack_id : PACK_ID_BITS;
 125         struct object_id oid;
 126 };
 127
 128 struct tag {
 129         struct tag *next_tag;
 130         const char *name;
 131         unsigned int pack_id;
 132         struct object_id oid;
 133 };
 134
 135 struct hash_list {
 136         struct hash_list *next;
 137         struct object_id oid;
 138 };
 139
 140 typedef enum {
 141         WHENSPEC_RAW = 1,
 142         WHENSPEC_RAW_PERMISSIVE,
 143         WHENSPEC_RFC2822,
 144         WHENSPEC_NOW
 145 } whenspec_type;
 146
 147 struct recent_command {
 148         struct recent_command *prev;
 149         struct recent_command *next;
 150         char *buf;
 151 };
 152
 153 typedef void (*mark_set_inserter_t)(struct mark_set **s, struct object_id *oid, uintmax_t mark);
 154 typedef void (*each_mark_fn_t)(uintmax_t mark, void *obj, void *cbp);
 155
 156 /* Configured limits on output */
 157 static unsigned long max_depth = 50;
 158 static off_t max_packsize;
 159 static int unpack_limit = 100;
 160 static int force_update;
 161
 162 /* Stats and misc. counters */
 163 static uintmax_t alloc_count;
 164 static uintmax_t marks_set_count;
 165 static uintmax_t object_count_by_type[1 << TYPE_BITS];
 166 static uintmax_t duplicate_count_by_type[1 << TYPE_BITS];
 167 static uintmax_t delta_count_by_type[1 << TYPE_BITS];
 168 static uintmax_t delta_count_attempts_by_type[1 << TYPE_BITS];
 169 static unsigned long object_count;
 170 static unsigned long branch_count;
 171 static unsigned long branch_load_count;
 172 static int failure;
 173 static FILE *pack_edges;
 174 static unsigned int show_stats = 1;
 175 static int global_argc;
 176 static const char **global_argv;
 177
 178 /* Memory pools */
 179 static struct mem_pool fi_mem_pool =  {NULL, 2*1024*1024 -
 180                                        sizeof(struct mp_block), 0 };
 181
 182 /* Atom management */
 183 static unsigned int atom_table_sz = 4451;
 184 static unsigned int atom_cnt;
 185 static struct atom_str **atom_table;
 186
 187 /* The .pack file being generated */
 188 static struct pack_idx_option pack_idx_opts;
 189 static unsigned int pack_id;
 190 static struct hashfile *pack_file;
 191 static struct packed_git *pack_data;
 192 static struct packed_git **all_packs;
 193 static off_t pack_size;
 194
 195 /* Table of objects we've written. */
 196 static unsigned int object_entry_alloc = 5000;
 197 static struct object_entry_pool *blocks;
 198 static struct hashmap object_table;
 199 static struct mark_set *marks;
 200 static const char *export_marks_file;
 201 static const char *import_marks_file;
 202 static int import_marks_file_from_stream;
 203 static int import_marks_file_ignore_missing;
 204 static int import_marks_file_done;
 205 static int relative_marks_paths;
 206
 207 /* Our last blob */
 208 static struct last_object last_blob = { STRBUF_INIT, 0, 0, 0 };
 209
 210 /* Tree management */
 211 static unsigned int tree_entry_alloc = 1000;
 212 static void *avail_tree_entry;
 213 static unsigned int avail_tree_table_sz = 100;
 214 static struct avail_tree_content **avail_tree_table;
 215 static size_t tree_entry_allocd;
 216 static struct strbuf old_tree = STRBUF_INIT;
 217 static struct strbuf new_tree = STRBUF_INIT;
 218
 219 /* Branch data */
 220 static unsigned long max_active_branches = 5;
 221 static unsigned long cur_active_branches;
 222 static unsigned long branch_table_sz = 1039;
 223 static struct branch **branch_table;
 224 static struct branch *active_branches;
 225
 226 /* Tag data */
 227 static struct tag *first_tag;
 228 static struct tag *last_tag;
 229
 230 /* Input stream parsing */
 231 static whenspec_type whenspec = WHENSPEC_RAW;
 232 static struct strbuf command_buf = STRBUF_INIT;
 233 static int unread_command_buf;
 234 static struct recent_command cmd_hist = {&cmd_hist, &cmd_hist, NULL};
 235 static struct recent_command *cmd_tail = &cmd_hist;
 236 static struct recent_command *rc_free;
 237 static unsigned int cmd_save = 100;
 238 static uintmax_t next_mark;
 239 static struct strbuf new_data = STRBUF_INIT;
 240 static int seen_data_command;
 241 static int require_explicit_termination;
 242 static int allow_unsafe_features;
 243
 244 /* Signal handling */
 245 static volatile sig_atomic_t checkpoint_requested;
 246
 247 /* Submodule marks */
 248 static struct string_list sub_marks_from = STRING_LIST_INIT_DUP;
 249 static struct string_list sub_marks_to = STRING_LIST_INIT_DUP;
 250 static kh_oid_map_t *sub_oid_map;
 251
 252 /* Where to write output of cat-blob commands */
 253 static int cat_blob_fd = STDOUT_FILENO;
 254
 255 static void parse_argv(void);
 256 static void parse_get_mark(const char *p);
 257 static void parse_cat_blob(const char *p);
 258 static void parse_ls(const char *p, struct branch *b);
 259
 260 static void for_each_mark(struct mark_set *m, uintmax_t base, each_mark_fn_t callback, void *p)
 261 {
 262         uintmax_t k;
 263         if (m->shift) {
 264                 for (k = 0; k < 1024; k++) {
 265                         if (m->data.sets[k])
 266                                 for_each_mark(m->data.sets[k], base + (k << m->shift), callback, p);
 267                 }
 268         } else {
 269                 for (k = 0; k < 1024; k++) {
 270                         if (m->data.marked[k])
 271                                 callback(base + k, m->data.marked[k], p);
 272                 }
 273         }
 274 }
 275
 276 static void dump_marks_fn(uintmax_t mark, void *object, void *cbp) {
 277         struct object_entry *e = object;
 278         FILE *f = cbp;
 279
 280         fprintf(f, ":%" PRIuMAX " %s\n", mark, oid_to_hex(&e->idx.oid));
 281 }
 282
 283 static void write_branch_report(FILE *rpt, struct branch *b)
 284 {
 285         fprintf(rpt, "%s:\n", b->name);
 286
 287         fprintf(rpt, "  status      :");
 288         if (b->active)
 289                 fputs(" active", rpt);
 290         if (b->branch_tree.tree)
 291                 fputs(" loaded", rpt);
 292         if (is_null_oid(&b->branch_tree.versions[1].oid))
 293                 fputs(" dirty", rpt);
 294         fputc('\n', rpt);
 295
 296         fprintf(rpt, "  tip commit  : %s\n", oid_to_hex(&b->oid));
 297         fprintf(rpt, "  old tree    : %s\n",
 298                 oid_to_hex(&b->branch_tree.versions[0].oid));
 299         fprintf(rpt, "  cur tree    : %s\n",
 300                 oid_to_hex(&b->branch_tree.versions[1].oid));
 301         fprintf(rpt, "  commit clock: %" PRIuMAX "\n", b->last_commit);
 302
 303         fputs("  last pack   : ", rpt);
 304         if (b->pack_id < MAX_PACK_ID)
 305                 fprintf(rpt, "%u", b->pack_id);
 306         fputc('\n', rpt);
 307
 308         fputc('\n', rpt);
 309 }
 310
 311 static void write_crash_report(const char *err)
 312 {
 313         char *loc = git_pathdup("fast_import_crash_%"PRIuMAX, (uintmax_t) getpid());
 314         FILE *rpt = fopen(loc, "w");
 315         struct branch *b;
 316         unsigned long lu;
 317         struct recent_command *rc;
 318
 319         if (!rpt) {
 320                 error_errno("can't write crash report %s", loc);
 321                 free(loc);
 322                 return;
 323         }
 324
 325         fprintf(stderr, "fast-import: dumping crash report to %s\n", loc);
 326
 327         fprintf(rpt, "fast-import crash report:\n");
 328         fprintf(rpt, "    fast-import process: %"PRIuMAX"\n", (uintmax_t) getpid());
 329         fprintf(rpt, "    parent process     : %"PRIuMAX"\n", (uintmax_t) getppid());
 330         fprintf(rpt, "    at %s\n", show_date(time(NULL), 0, DATE_MODE(ISO8601)));
 331         fputc('\n', rpt);
 332
 333         fputs("fatal: ", rpt);
 334         fputs(err, rpt);
 335         fputc('\n', rpt);
 336
 337         fputc('\n', rpt);
 338         fputs("Most Recent Commands Before Crash\n", rpt);
 339         fputs("---------------------------------\n", rpt);
 340         for (rc = cmd_hist.next; rc != &cmd_hist; rc = rc->next) {
 341                 if (rc->next == &cmd_hist)
 342                         fputs("* ", rpt);
 343                 else
 344                         fputs("  ", rpt);
 345                 fputs(rc->buf, rpt);
 346                 fputc('\n', rpt);
 347         }
 348
 349         fputc('\n', rpt);
 350         fputs("Active Branch LRU\n", rpt);
 351         fputs("-----------------\n", rpt);
 352         fprintf(rpt, "    active_branches = %lu cur, %lu max\n",
 353                 cur_active_branches,
 354                 max_active_branches);
 355         fputc('\n', rpt);
 356         fputs("  pos  clock name\n", rpt);
 357         fputs("  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n", rpt);
 358         for (b = active_branches, lu = 0; b; b = b->active_next_branch)
 359                 fprintf(rpt, "  %2lu) %6" PRIuMAX" %s\n",
 360                         ++lu, b->last_commit, b->name);
 361
 362         fputc('\n', rpt);
 363         fputs("Inactive Branches\n", rpt);
 364         fputs("-----------------\n", rpt);
 365         for (lu = 0; lu < branch_table_sz; lu++) {
 366                 for (b = branch_table[lu]; b; b = b->table_next_branch)
 367                         write_branch_report(rpt, b);
 368         }
 369
 370         if (first_tag) {
 371                 struct tag *tg;
 372                 fputc('\n', rpt);
 373                 fputs("Annotated Tags\n", rpt);
 374                 fputs("--------------\n", rpt);
 375                 for (tg = first_tag; tg; tg = tg->next_tag) {
 376                         fputs(oid_to_hex(&tg->oid), rpt);
 377                         fputc(' ', rpt);
 378                         fputs(tg->name, rpt);
 379                         fputc('\n', rpt);
 380                 }
 381         }
 382
 383         fputc('\n', rpt);
 384         fputs("Marks\n", rpt);
 385         fputs("-----\n", rpt);
 386         if (export_marks_file)
 387                 fprintf(rpt, "  exported to %s\n", export_marks_file);
 388         else
 389                 for_each_mark(marks, 0, dump_marks_fn, rpt);
 390
 391         fputc('\n', rpt);
 392         fputs("-------------------\n", rpt);
 393         fputs("END OF CRASH REPORT\n", rpt);
 394         fclose(rpt);
 395         free(loc);
 396 }
 397
 398 static void end_packfile(void);
 399 static void unkeep_all_packs(void);
 400 static void dump_marks(void);
 401
 402 static NORETURN void die_nicely(const char *err, va_list params)
 403 {
 404         static int zombie;
 405         char message[2 * PATH_MAX];
 406
 407         vsnprintf(message, sizeof(message), err, params);
 408         fputs("fatal: ", stderr);
 409         fputs(message, stderr);
 410         fputc('\n', stderr);
 411
 412         if (!zombie) {
 413                 zombie = 1;
 414                 write_crash_report(message);
 415                 end_packfile();
 416                 unkeep_all_packs();
 417                 dump_marks();
 418         }
 419         exit(128);
 420 }
 421
 422 #ifndef SIGUSR1 /* Windows, for example */
 423
 424 static void set_checkpoint_signal(void)
 425 {
 426 }
 427
 428 #else
 429
 430 static void checkpoint_signal(int signo)
 431 {
 432         checkpoint_requested = 1;
 433 }
 434
 435 static void set_checkpoint_signal(void)
 436 {
 437         struct sigaction sa;
 438
 439         memset(&sa, 0, sizeof(sa));
 440         sa.sa_handler = checkpoint_signal;
 441         sigemptyset(&sa.sa_mask);
 442         sa.sa_flags = SA_RESTART;
 443         sigaction(SIGUSR1, &sa, NULL);
 444 }
 445
 446 #endif
 447
 448 static void alloc_objects(unsigned int cnt)
 449 {
 450         struct object_entry_pool *b;
 451
 452         b = xmalloc(sizeof(struct object_entry_pool)
 453                 + cnt * sizeof(struct object_entry));
 454         b->next_pool = blocks;
 455         b->next_free = b->entries;
 456         b->end = b->entries + cnt;
 457         blocks = b;
 458         alloc_count += cnt;
 459 }
 460
 461 static struct object_entry *new_object(struct object_id *oid)
 462 {
 463         struct object_entry *e;
 464
 465         if (blocks->next_free == blocks->end)
 466                 alloc_objects(object_entry_alloc);
 467
 468         e = blocks->next_free++;
 469         oidcpy(&e->idx.oid, oid);
 470         return e;
 471 }
 472
 473 static struct object_entry *find_object(struct object_id *oid)
 474 {
 475         return hashmap_get_entry_from_hash(&object_table, oidhash(oid), oid,
 476                                            struct object_entry, ent);
 477 }
 478
 479 static struct object_entry *insert_object(struct object_id *oid)
 480 {
 481         struct object_entry *e;
 482         unsigned int hash = oidhash(oid);
 483
 484         e = hashmap_get_entry_from_hash(&object_table, hash, oid,
 485                                         struct object_entry, ent);
 486         if (!e) {
 487                 e = new_object(oid);
 488                 e->idx.offset = 0;
 489                 hashmap_entry_init(&e->ent, hash);
 490                 hashmap_add(&object_table, &e->ent);
 491         }
 492
 493         return e;
 494 }
 495
 496 static void invalidate_pack_id(unsigned int id)
 497 {
 498         unsigned long lu;
 499         struct tag *t;
 500         struct hashmap_iter iter;
 501         struct object_entry *e;
 502
 503         hashmap_for_each_entry(&object_table, &iter, e, ent) {
 504                 if (e->pack_id == id)
 505                         e->pack_id = MAX_PACK_ID;
 506         }
 507
 508         for (lu = 0; lu < branch_table_sz; lu++) {
 509                 struct branch *b;
 510
 511                 for (b = branch_table[lu]; b; b = b->table_next_branch)
 512                         if (b->pack_id == id)
 513                                 b->pack_id = MAX_PACK_ID;
 514         }
 515
 516         for (t = first_tag; t; t = t->next_tag)
 517                 if (t->pack_id == id)
 518                         t->pack_id = MAX_PACK_ID;
 519 }
 520
 521 static unsigned int hc_str(const char *s, size_t len)
 522 {
 523         unsigned int r = 0;
 524         while (len-- > 0)
 525                 r = r * 31 + *s++;
 526         return r;
 527 }
 528
 529 static void insert_mark(struct mark_set **top, uintmax_t idnum, struct object_entry *oe)
 530 {
 531         struct mark_set *s = *top;
 532
 533         while ((idnum >> s->shift) >= 1024) {
 534                 s = mem_pool_calloc(&fi_mem_pool, 1, sizeof(struct mark_set));
 535                 s->shift = (*top)->shift + 10;
 536                 s->data.sets[0] = *top;
 537                 *top = s;
 538         }
 539         while (s->shift) {
 540                 uintmax_t i = idnum >> s->shift;
 541                 idnum -= i << s->shift;
 542                 if (!s->data.sets[i]) {
 543                         s->data.sets[i] = mem_pool_calloc(&fi_mem_pool, 1, sizeof(struct mark_set));
 544                         s->data.sets[i]->shift = s->shift - 10;
 545                 }
 546                 s = s->data.sets[i];
 547         }
 548         if (!s->data.marked[idnum])
 549                 marks_set_count++;
 550         s->data.marked[idnum] = oe;
 551 }
 552
 553 static void *find_mark(struct mark_set *s, uintmax_t idnum)
 554 {
 555         uintmax_t orig_idnum = idnum;
 556         struct object_entry *oe = NULL;
 557         if ((idnum >> s->shift) < 1024) {
 558                 while (s && s->shift) {
 559                         uintmax_t i = idnum >> s->shift;
 560                         idnum -= i << s->shift;
 561                         s = s->data.sets[i];
 562                 }
 563                 if (s)
 564                         oe = s->data.marked[idnum];
 565         }
 566         if (!oe)
 567                 die("mark :%" PRIuMAX " not declared", orig_idnum);
 568         return oe;
 569 }
 570
 571 static struct atom_str *to_atom(const char *s, unsigned short len)
 572 {
 573         unsigned int hc = hc_str(s, len) % atom_table_sz;
 574         struct atom_str *c;
 575
 576         for (c = atom_table[hc]; c; c = c->next_atom)
 577                 if (c->str_len == len && !strncmp(s, c->str_dat, len))
 578                         return c;
 579
 580         c = mem_pool_alloc(&fi_mem_pool, sizeof(struct atom_str) + len + 1);
 581         c->str_len = len;
 582         memcpy(c->str_dat, s, len);
 583         c->str_dat[len] = 0;
 584         c->next_atom = atom_table[hc];
 585         atom_table[hc] = c;
 586         atom_cnt++;
 587         return c;
 588 }
 589
 590 static struct branch *lookup_branch(const char *name)
 591 {
 592         unsigned int hc = hc_str(name, strlen(name)) % branch_table_sz;
 593         struct branch *b;
 594
 595         for (b = branch_table[hc]; b; b = b->table_next_branch)
 596                 if (!strcmp(name, b->name))
 597                         return b;
 598         return NULL;
 599 }
 600
 601 static struct branch *new_branch(const char *name)
 602 {
 603         unsigned int hc = hc_str(name, strlen(name)) % branch_table_sz;
 604         struct branch *b = lookup_branch(name);
 605
 606         if (b)
 607                 die("Invalid attempt to create duplicate branch: %s", name);
 608         if (check_refname_format(name, REFNAME_ALLOW_ONELEVEL))
 609                 die("Branch name doesn't conform to GIT standards: %s", name);
 610
 611         b = mem_pool_calloc(&fi_mem_pool, 1, sizeof(struct branch));
 612         b->name = mem_pool_strdup(&fi_mem_pool, name);
 613         b->table_next_branch = branch_table[hc];
 614         b->branch_tree.versions[0].mode = S_IFDIR;
 615         b->branch_tree.versions[1].mode = S_IFDIR;
 616         b->num_notes = 0;
 617         b->active = 0;
 618         b->pack_id = MAX_PACK_ID;
 619         branch_table[hc] = b;
 620         branch_count++;
 621         return b;
 622 }
 623
 624 static unsigned int hc_entries(unsigned int cnt)
 625 {
 626         cnt = cnt & 7 ? (cnt / 8) + 1 : cnt / 8;
 627         return cnt < avail_tree_table_sz ? cnt : avail_tree_table_sz - 1;
 628 }
 629
 630 static struct tree_content *new_tree_content(unsigned int cnt)
 631 {
 632         struct avail_tree_content *f, *l = NULL;
 633         struct tree_content *t;
 634         unsigned int hc = hc_entries(cnt);
 635
 636         for (f = avail_tree_table[hc]; f; l = f, f = f->next_avail)
 637                 if (f->entry_capacity >= cnt)
 638                         break;
 639
 640         if (f) {
 641                 if (l)
 642                         l->next_avail = f->next_avail;
 643                 else
 644                         avail_tree_table[hc] = f->next_avail;
 645         } else {
 646                 cnt = cnt & 7 ? ((cnt / 8) + 1) * 8 : cnt;
 647                 f = mem_pool_alloc(&fi_mem_pool, sizeof(*t) + sizeof(t->entries[0]) * cnt);
 648                 f->entry_capacity = cnt;
 649         }
 650
 651         t = (struct tree_content*)f;
 652         t->entry_count = 0;
 653         t->delta_depth = 0;
 654         return t;
 655 }
 656
 657 static void release_tree_entry(struct tree_entry *e);
 658 static void release_tree_content(struct tree_content *t)
 659 {
 660         struct avail_tree_content *f = (struct avail_tree_content*)t;
 661         unsigned int hc = hc_entries(f->entry_capacity);
 662         f->next_avail = avail_tree_table[hc];
 663         avail_tree_table[hc] = f;
 664 }
 665
 666 static void release_tree_content_recursive(struct tree_content *t)
 667 {
 668         unsigned int i;
 669         for (i = 0; i < t->entry_count; i++)
 670                 release_tree_entry(t->entries[i]);
 671         release_tree_content(t);
 672 }
 673
 674 static struct tree_content *grow_tree_content(
 675         struct tree_content *t,
 676         int amt)
 677 {
 678         struct tree_content *r = new_tree_content(t->entry_count + amt);
 679         r->entry_count = t->entry_count;
 680         r->delta_depth = t->delta_depth;
 681         COPY_ARRAY(r->entries, t->entries, t->entry_count);
 682         release_tree_content(t);
 683         return r;
 684 }
 685
 686 static struct tree_entry *new_tree_entry(void)
 687 {
 688         struct tree_entry *e;
 689
 690         if (!avail_tree_entry) {
 691                 unsigned int n = tree_entry_alloc;
 692                 tree_entry_allocd += n * sizeof(struct tree_entry);
 693                 ALLOC_ARRAY(e, n);
 694                 avail_tree_entry = e;
 695                 while (n-- > 1) {
 696                         *((void**)e) = e + 1;
 697                         e++;
 698                 }
 699                 *((void**)e) = NULL;
 700         }
 701
 702         e = avail_tree_entry;
 703         avail_tree_entry = *((void**)e);
 704         return e;
 705 }
 706
 707 static void release_tree_entry(struct tree_entry *e)
 708 {
 709         if (e->tree)
 710                 release_tree_content_recursive(e->tree);
 711         *((void**)e) = avail_tree_entry;
 712         avail_tree_entry = e;
 713 }
 714
 715 static struct tree_content *dup_tree_content(struct tree_content *s)
 716 {
 717         struct tree_content *d;
 718         struct tree_entry *a, *b;
 719         unsigned int i;
 720
 721         if (!s)
 722                 return NULL;
 723         d = new_tree_content(s->entry_count);
 724         for (i = 0; i < s->entry_count; i++) {
 725                 a = s->entries[i];
 726                 b = new_tree_entry();
 727                 memcpy(b, a, sizeof(*a));
 728                 if (a->tree && is_null_oid(&b->versions[1].oid))
 729                         b->tree = dup_tree_content(a->tree);
 730                 else
 731                         b->tree = NULL;
 732                 d->entries[i] = b;
 733         }
 734         d->entry_count = s->entry_count;
 735         d->delta_depth = s->delta_depth;
 736
 737         return d;
 738 }
 739
 740 static void start_packfile(void)
 741 {
 742         struct strbuf tmp_file = STRBUF_INIT;
 743         struct packed_git *p;
 744         int pack_fd;
 745
 746         pack_fd = odb_mkstemp(&tmp_file, "pack/tmp_pack_XXXXXX");
 747         FLEX_ALLOC_STR(p, pack_name, tmp_file.buf);
 748         strbuf_release(&tmp_file);
 749
 750         p->pack_fd = pack_fd;
 751         p->do_not_close = 1;
 752         pack_file = hashfd(pack_fd, p->pack_name);
 753
 754         pack_data = p;
 755         pack_size = write_pack_header(pack_file, 0);
 756         object_count = 0;
 757
 758         REALLOC_ARRAY(all_packs, pack_id + 1);
 759         all_packs[pack_id] = p;
 760 }
 761
 762 static const char *create_index(void)
 763 {
 764         const char *tmpfile;
 765         struct pack_idx_entry **idx, **c, **last;
 766         struct object_entry *e;
 767         struct object_entry_pool *o;
 768
 769         /* Build the table of object IDs. */
 770         ALLOC_ARRAY(idx, object_count);
 771         c = idx;
 772         for (o = blocks; o; o = o->next_pool)
 773                 for (e = o->next_free; e-- != o->entries;)
 774                         if (pack_id == e->pack_id)
 775                                 *c++ = &e->idx;
 776         last = idx + object_count;
 777         if (c != last)
 778                 die("internal consistency error creating the index");
 779
 780         tmpfile = write_idx_file(NULL, idx, object_count, &pack_idx_opts,
 781                                  pack_data->hash);
 782         free(idx);
 783         return tmpfile;
 784 }
 785
 786 static char *keep_pack(const char *curr_index_name)
 787 {
 788         static const char *keep_msg = "fast-import";
 789         struct strbuf name = STRBUF_INIT;
 790         int keep_fd;
 791
 792         odb_pack_name(&name, pack_data->hash, "keep");
 793         keep_fd = odb_pack_keep(name.buf);
 794         if (keep_fd < 0)
 795                 die_errno("cannot create keep file");
 796         write_or_die(keep_fd, keep_msg, strlen(keep_msg));
 797         if (close(keep_fd))
 798                 die_errno("failed to write keep file");
 799
 800         odb_pack_name(&name, pack_data->hash, "pack");
 801         if (finalize_object_file(pack_data->pack_name, name.buf))
 802                 die("cannot store pack file");
 803
 804         odb_pack_name(&name, pack_data->hash, "idx");
 805         if (finalize_object_file(curr_index_name, name.buf))
 806                 die("cannot store index file");
 807         free((void *)curr_index_name);
 808         return strbuf_detach(&name, NULL);
 809 }
 810
 811 static void unkeep_all_packs(void)
 812 {
 813         struct strbuf name = STRBUF_INIT;
 814         int k;
 815
 816         for (k = 0; k < pack_id; k++) {
 817                 struct packed_git *p = all_packs[k];
 818                 odb_pack_name(&name, p->hash, "keep");
 819                 unlink_or_warn(name.buf);
 820         }
 821         strbuf_release(&name);
 822 }
 823
 824 static int loosen_small_pack(const struct packed_git *p)
 825 {
 826         struct child_process unpack = CHILD_PROCESS_INIT;
 827
 828         if (lseek(p->pack_fd, 0, SEEK_SET) < 0)
 829                 die_errno("Failed seeking to start of '%s'", p->pack_name);
 830
 831         unpack.in = p->pack_fd;
 832         unpack.git_cmd = 1;
 833         unpack.stdout_to_stderr = 1;
 834         strvec_push(&unpack.args, "unpack-objects");
 835         if (!show_stats)
 836                 strvec_push(&unpack.args, "-q");
 837
 838         return run_command(&unpack);
 839 }
 840
 841 static void end_packfile(void)
 842 {
 843         static int running;
 844
 845         if (running || !pack_data)
 846                 return;
 847
 848         running = 1;
 849         clear_delta_base_cache();
 850         if (object_count) {
 851                 struct packed_git *new_p;
 852                 struct object_id cur_pack_oid;
 853                 char *idx_name;
 854                 int i;
 855                 struct branch *b;
 856                 struct tag *t;
 857
 858                 close_pack_windows(pack_data);
 859                 finalize_hashfile(pack_file, cur_pack_oid.hash, 0);
 860                 fixup_pack_header_footer(pack_data->pack_fd, pack_data->hash,
 861                                          pack_data->pack_name, object_count,
 862                                          cur_pack_oid.hash, pack_size);
 863
 864                 if (object_count <= unpack_limit) {
 865                         if (!loosen_small_pack(pack_data)) {
 866                                 invalidate_pack_id(pack_id);
 867                                 goto discard_pack;
 868                         }
 869                 }
 870
 871                 close(pack_data->pack_fd);
 872                 idx_name = keep_pack(create_index());
 873
 874                 /* Register the packfile with core git's machinery. */
 875                 new_p = add_packed_git(idx_name, strlen(idx_name), 1);
 876                 if (!new_p)
 877                         die("core git rejected index %s", idx_name);
 878                 all_packs[pack_id] = new_p;
 879                 install_packed_git(the_repository, new_p);
 880                 free(idx_name);
 881
 882                 /* Print the boundary */
 883                 if (pack_edges) {
 884                         fprintf(pack_edges, "%s:", new_p->pack_name);
 885                         for (i = 0; i < branch_table_sz; i++) {
 886                                 for (b = branch_table[i]; b; b = b->table_next_branch) {
 887                                         if (b->pack_id == pack_id)
 888                                                 fprintf(pack_edges, " %s",
 889                                                         oid_to_hex(&b->oid));
 890                                 }
 891                         }
 892                         for (t = first_tag; t; t = t->next_tag) {
 893                                 if (t->pack_id == pack_id)
 894                                         fprintf(pack_edges, " %s",
 895                                                 oid_to_hex(&t->oid));
 896                         }
 897                         fputc('\n', pack_edges);
 898                         fflush(pack_edges);
 899                 }
 900
 901                 pack_id++;
 902         }
 903         else {
 904 discard_pack:
 905                 close(pack_data->pack_fd);
 906                 unlink_or_warn(pack_data->pack_name);
 907         }
 908         FREE_AND_NULL(pack_data);
 909         running = 0;
 910
 911         /* We can't carry a delta across packfiles. */
 912         strbuf_release(&last_blob.data);
 913         last_blob.offset = 0;
 914         last_blob.depth = 0;
 915 }
 916
 917 static void cycle_packfile(void)
 918 {
 919         end_packfile();
 920         start_packfile();
 921 }
 922
 923 static int store_object(
 924         enum object_type type,
 925         struct strbuf *dat,
 926         struct last_object *last,
 927         struct object_id *oidout,
 928         uintmax_t mark)
 929 {
 930         void *out, *delta;
 931         struct object_entry *e;
 932         unsigned char hdr[96];
 933         struct object_id oid;
 934         unsigned long hdrlen, deltalen;
 935         git_hash_ctx c;
 936         git_zstream s;
 937
 938         hdrlen = xsnprintf((char *)hdr, sizeof(hdr), "%s %lu",
 939                            type_name(type), (unsigned long)dat->len) + 1;
 940         the_hash_algo->init_fn(&c);
 941         the_hash_algo->update_fn(&c, hdr, hdrlen);
 942         the_hash_algo->update_fn(&c, dat->buf, dat->len);
 943         the_hash_algo->final_fn(oid.hash, &c);
 944         if (oidout)
 945                 oidcpy(oidout, &oid);
 946
 947         e = insert_object(&oid);
 948         if (mark)
 949                 insert_mark(&marks, mark, e);
 950         if (e->idx.offset) {
 951                 duplicate_count_by_type[type]++;
 952                 return 1;
 953         } else if (find_sha1_pack(oid.hash,
 954                                   get_all_packs(the_repository))) {
 955                 e->type = type;
 956                 e->pack_id = MAX_PACK_ID;
 957                 e->idx.offset = 1; /* just not zero! */
 958                 duplicate_count_by_type[type]++;
 959                 return 1;
 960         }
 961
 962         if (last && last->data.len && last->data.buf && last->depth < max_depth
 963                 && dat->len > the_hash_algo->rawsz) {
 964
 965                 delta_count_attempts_by_type[type]++;
 966                 delta = diff_delta(last->data.buf, last->data.len,
 967                         dat->buf, dat->len,
 968                         &deltalen, dat->len - the_hash_algo->rawsz);
 969         } else
 970                 delta = NULL;
 971
 972         git_deflate_init(&s, pack_compression_level);
 973         if (delta) {
 974                 s.next_in = delta;
 975                 s.avail_in = deltalen;
 976         } else {
 977                 s.next_in = (void *)dat->buf;
 978                 s.avail_in = dat->len;
 979         }
 980         s.avail_out = git_deflate_bound(&s, s.avail_in);
 981         s.next_out = out = xmalloc(s.avail_out);
 982         while (git_deflate(&s, Z_FINISH) == Z_OK)
 983                 ; /* nothing */
 984         git_deflate_end(&s);
 985
 986         /* Determine if we should auto-checkpoint. */
 987         if ((max_packsize
 988                 && (pack_size + PACK_SIZE_THRESHOLD + s.total_out) > max_packsize)
 989                 || (pack_size + PACK_SIZE_THRESHOLD + s.total_out) < pack_size) {
 990
 991                 /* This new object needs to *not* have the current pack_id. */
 992                 e->pack_id = pack_id + 1;
 993                 cycle_packfile();
 994
 995                 /* We cannot carry a delta into the new pack. */
 996                 if (delta) {
 997                         FREE_AND_NULL(delta);
 998
 999                         git_deflate_init(&s, pack_compression_level);
1000                         s.next_in = (void *)dat->buf;
1001                         s.avail_in = dat->len;
1002                         s.avail_out = git_deflate_bound(&s, s.avail_in);
1003                         s.next_out = out = xrealloc(out, s.avail_out);
1004                         while (git_deflate(&s, Z_FINISH) == Z_OK)
1005                                 ; /* nothing */
1006                         git_deflate_end(&s);
1007                 }
1008         }
1009
1010         e->type = type;
1011         e->pack_id = pack_id;
1012         e->idx.offset = pack_size;
1013         object_count++;
1014         object_count_by_type[type]++;
1015
1016         crc32_begin(pack_file);
1017
1018         if (delta) {
1019                 off_t ofs = e->idx.offset - last->offset;
1020                 unsigned pos = sizeof(hdr) - 1;
1021
1022                 delta_count_by_type[type]++;
1023                 e->depth = last->depth + 1;
1024
1025                 hdrlen = encode_in_pack_object_header(hdr, sizeof(hdr),
1026                                                       OBJ_OFS_DELTA, deltalen);
1027                 hashwrite(pack_file, hdr, hdrlen);
1028                 pack_size += hdrlen;
1029
1030                 hdr[pos] = ofs & 127;
1031                 while (ofs >>= 7)
1032                         hdr[--pos] = 128 | (--ofs & 127);
1033                 hashwrite(pack_file, hdr + pos, sizeof(hdr) - pos);
1034                 pack_size += sizeof(hdr) - pos;
1035         } else {
1036                 e->depth = 0;
1037                 hdrlen = encode_in_pack_object_header(hdr, sizeof(hdr),
1038                                                       type, dat->len);
1039                 hashwrite(pack_file, hdr, hdrlen);
1040                 pack_size += hdrlen;
1041         }
1042
1043         hashwrite(pack_file, out, s.total_out);
1044         pack_size += s.total_out;
1045
1046         e->idx.crc32 = crc32_end(pack_file);
1047
1048         free(out);
1049         free(delta);
1050         if (last) {
1051                 if (last->no_swap) {
1052                         last->data = *dat;
1053                 } else {
1054                         strbuf_swap(&last->data, dat);
1055                 }
1056                 last->offset = e->idx.offset;
1057                 last->depth = e->depth;
1058         }
1059         return 0;
1060 }
1061
1062 static void truncate_pack(struct hashfile_checkpoint *checkpoint)
1063 {
1064         if (hashfile_truncate(pack_file, checkpoint))
1065                 die_errno("cannot truncate pack to skip duplicate");
1066         pack_size = checkpoint->offset;
1067 }
1068
1069 static void stream_blob(uintmax_t len, struct object_id *oidout, uintmax_t mark)
1070 {
1071         size_t in_sz = 64 * 1024, out_sz = 64 * 1024;
1072         unsigned char *in_buf = xmalloc(in_sz);
1073         unsigned char *out_buf = xmalloc(out_sz);
1074         struct object_entry *e;
1075         struct object_id oid;
1076         unsigned long hdrlen;
1077         off_t offset;
1078         git_hash_ctx c;
1079         git_zstream s;
1080         struct hashfile_checkpoint checkpoint;
1081         int status = Z_OK;
1082
1083         /* Determine if we should auto-checkpoint. */
1084         if ((max_packsize
1085                 && (pack_size + PACK_SIZE_THRESHOLD + len) > max_packsize)
1086                 || (pack_size + PACK_SIZE_THRESHOLD + len) < pack_size)
1087                 cycle_packfile();
1088
1089         hashfile_checkpoint(pack_file, &checkpoint);
1090         offset = checkpoint.offset;
1091
1092         hdrlen = xsnprintf((char *)out_buf, out_sz, "blob %" PRIuMAX, len) + 1;
1093
1094         the_hash_algo->init_fn(&c);
1095         the_hash_algo->update_fn(&c, out_buf, hdrlen);
1096
1097         crc32_begin(pack_file);
1098
1099         git_deflate_init(&s, pack_compression_level);
1100
1101         hdrlen = encode_in_pack_object_header(out_buf, out_sz, OBJ_BLOB, len);
1102
1103         s.next_out = out_buf + hdrlen;
1104         s.avail_out = out_sz - hdrlen;
1105
1106         while (status != Z_STREAM_END) {
1107                 if (0 < len && !s.avail_in) {
1108                         size_t cnt = in_sz < len ? in_sz : (size_t)len;
1109                         size_t n = fread(in_buf, 1, cnt, stdin);
1110                         if (!n && feof(stdin))
1111                                 die("EOF in data (%" PRIuMAX " bytes remaining)", len);
1112
1113                         the_hash_algo->update_fn(&c, in_buf, n);
1114                         s.next_in = in_buf;
1115                         s.avail_in = n;
1116                         len -= n;
1117                 }
1118
1119                 status = git_deflate(&s, len ? 0 : Z_FINISH);
1120
1121                 if (!s.avail_out || status == Z_STREAM_END) {
1122                         size_t n = s.next_out - out_buf;
1123                         hashwrite(pack_file, out_buf, n);
1124                         pack_size += n;
1125                         s.next_out = out_buf;
1126                         s.avail_out = out_sz;
1127                 }
1128
1129                 switch (status) {
1130                 case Z_OK:
1131                 case Z_BUF_ERROR:
1132                 case Z_STREAM_END:
1133                         continue;
1134                 default:
1135                         die("unexpected deflate failure: %d", status);
1136                 }
1137         }
1138         git_deflate_end(&s);
1139         the_hash_algo->final_fn(oid.hash, &c);
1140
1141         if (oidout)
1142                 oidcpy(oidout, &oid);
1143
1144         e = insert_object(&oid);
1145
1146         if (mark)
1147                 insert_mark(&marks, mark, e);
1148
1149         if (e->idx.offset) {
1150                 duplicate_count_by_type[OBJ_BLOB]++;
1151                 truncate_pack(&checkpoint);
1152
1153         } else if (find_sha1_pack(oid.hash,
1154                                   get_all_packs(the_repository))) {
1155                 e->type = OBJ_BLOB;
1156                 e->pack_id = MAX_PACK_ID;
1157                 e->idx.offset = 1; /* just not zero! */
1158                 duplicate_count_by_type[OBJ_BLOB]++;
1159                 truncate_pack(&checkpoint);
1160
1161         } else {
1162                 e->depth = 0;
1163                 e->type = OBJ_BLOB;
1164                 e->pack_id = pack_id;
1165                 e->idx.offset = offset;
1166                 e->idx.crc32 = crc32_end(pack_file);
1167                 object_count++;
1168                 object_count_by_type[OBJ_BLOB]++;
1169         }
1170
1171         free(in_buf);
1172         free(out_buf);
1173 }
1174
1175 /* All calls must be guarded by find_object() or find_mark() to
1176  * ensure the 'struct object_entry' passed was written by this
1177  * process instance.  We unpack the entry by the offset, avoiding
1178  * the need for the corresponding .idx file.  This unpacking rule
1179  * works because we only use OBJ_REF_DELTA within the packfiles
1180  * created by fast-import.
1181  *
1182  * oe must not be NULL.  Such an oe usually comes from giving
1183  * an unknown SHA-1 to find_object() or an undefined mark to
1184  * find_mark().  Callers must test for this condition and use
1185  * the standard read_sha1_file() when it happens.
1186  *
1187  * oe->pack_id must not be MAX_PACK_ID.  Such an oe is usually from
1188  * find_mark(), where the mark was reloaded from an existing marks
1189  * file and is referencing an object that this fast-import process
1190  * instance did not write out to a packfile.  Callers must test for
1191  * this condition and use read_sha1_file() instead.
1192  */
1193 static void *gfi_unpack_entry(
1194         struct object_entry *oe,
1195         unsigned long *sizep)
1196 {
1197         enum object_type type;
1198         struct packed_git *p = all_packs[oe->pack_id];
1199         if (p == pack_data && p->pack_size < (pack_size + the_hash_algo->rawsz)) {
1200                 /* The object is stored in the packfile we are writing to
1201                  * and we have modified it since the last time we scanned
1202                  * back to read a previously written object.  If an old
1203                  * window covered [p->pack_size, p->pack_size + rawsz) its
1204                  * data is stale and is not valid.  Closing all windows
1205                  * and updating the packfile length ensures we can read
1206                  * the newly written data.
1207                  */
1208                 close_pack_windows(p);
1209                 hashflush(pack_file);
1210
1211                 /* We have to offer rawsz bytes additional on the end of
1212                  * the packfile as the core unpacker code assumes the
1213                  * footer is present at the file end and must promise
1214                  * at least rawsz bytes within any window it maps.  But
1215                  * we don't actually create the footer here.
1216                  */
1217                 p->pack_size = pack_size + the_hash_algo->rawsz;
1218         }
1219         return unpack_entry(the_repository, p, oe->idx.offset, &type, sizep);
1220 }
1221
1222 static const char *get_mode(const char *str, uint16_t *modep)
1223 {
1224         unsigned char c;
1225         uint16_t mode = 0;
1226
1227         while ((c = *str++) != ' ') {
1228                 if (c < '0' || c > '7')
1229                         return NULL;
1230                 mode = (mode << 3) + (c - '0');
1231         }
1232         *modep = mode;
1233         return str;
1234 }
1235
1236 static void load_tree(struct tree_entry *root)
1237 {
1238         struct object_id *oid = &root->versions[1].oid;
1239         struct object_entry *myoe;
1240         struct tree_content *t;
1241         unsigned long size;
1242         char *buf;
1243         const char *c;
1244
1245         root->tree = t = new_tree_content(8);
1246         if (is_null_oid(oid))
1247                 return;
1248
1249         myoe = find_object(oid);
1250         if (myoe && myoe->pack_id != MAX_PACK_ID) {
1251                 if (myoe->type != OBJ_TREE)
1252                         die("Not a tree: %s", oid_to_hex(oid));
1253                 t->delta_depth = myoe->depth;
1254                 buf = gfi_unpack_entry(myoe, &size);
1255                 if (!buf)
1256                         die("Can't load tree %s", oid_to_hex(oid));
1257         } else {
1258                 enum object_type type;
1259                 buf = read_object_file(oid, &type, &size);
1260                 if (!buf || type != OBJ_TREE)
1261                         die("Can't load tree %s", oid_to_hex(oid));
1262         }
1263
1264         c = buf;
1265         while (c != (buf + size)) {
1266                 struct tree_entry *e = new_tree_entry();
1267
1268                 if (t->entry_count == t->entry_capacity)
1269                         root->tree = t = grow_tree_content(t, t->entry_count);
1270                 t->entries[t->entry_count++] = e;
1271
1272                 e->tree = NULL;
1273                 c = get_mode(c, &e->versions[1].mode);
1274                 if (!c)
1275                         die("Corrupt mode in %s", oid_to_hex(oid));
1276                 e->versions[0].mode = e->versions[1].mode;
1277                 e->name = to_atom(c, strlen(c));
1278                 c += e->name->str_len + 1;
1279                 hashcpy(e->versions[0].oid.hash, (unsigned char *)c);
1280                 hashcpy(e->versions[1].oid.hash, (unsigned char *)c);
1281                 c += the_hash_algo->rawsz;
1282         }
1283         free(buf);
1284 }
1285
1286 static int tecmp0 (const void *_a, const void *_b)
1287 {
1288         struct tree_entry *a = *((struct tree_entry**)_a);
1289         struct tree_entry *b = *((struct tree_entry**)_b);
1290         return base_name_compare(
1291                 a->name->str_dat, a->name->str_len, a->versions[0].mode,
1292                 b->name->str_dat, b->name->str_len, b->versions[0].mode);
1293 }
1294
1295 static int tecmp1 (const void *_a, const void *_b)
1296 {
1297         struct tree_entry *a = *((struct tree_entry**)_a);
1298         struct tree_entry *b = *((struct tree_entry**)_b);
1299         return base_name_compare(
1300                 a->name->str_dat, a->name->str_len, a->versions[1].mode,
1301                 b->name->str_dat, b->name->str_len, b->versions[1].mode);
1302 }
1303
1304 static void mktree(struct tree_content *t, int v, struct strbuf *b)
1305 {
1306         size_t maxlen = 0;
1307         unsigned int i;
1308
1309         if (!v)
1310                 QSORT(t->entries, t->entry_count, tecmp0);
1311         else
1312                 QSORT(t->entries, t->entry_count, tecmp1);
1313
1314         for (i = 0; i < t->entry_count; i++) {
1315                 if (t->entries[i]->versions[v].mode)
1316                         maxlen += t->entries[i]->name->str_len + 34;
1317         }
1318
1319         strbuf_reset(b);
1320         strbuf_grow(b, maxlen);
1321         for (i = 0; i < t->entry_count; i++) {
1322                 struct tree_entry *e = t->entries[i];
1323                 if (!e->versions[v].mode)
1324                         continue;
1325                 strbuf_addf(b, "%o %s%c",
1326                         (unsigned int)(e->versions[v].mode & ~NO_DELTA),
1327                         e->name->str_dat, '\0');
1328                 strbuf_add(b, e->versions[v].oid.hash, the_hash_algo->rawsz);
1329         }
1330 }
1331
1332 static void store_tree(struct tree_entry *root)
1333 {
1334         struct tree_content *t;
1335         unsigned int i, j, del;
1336         struct last_object lo = { STRBUF_INIT, 0, 0, /* no_swap */ 1 };
1337         struct object_entry *le = NULL;
1338
1339         if (!is_null_oid(&root->versions[1].oid))
1340                 return;
1341
1342         if (!root->tree)
1343                 load_tree(root);
1344         t = root->tree;
1345
1346         for (i = 0; i < t->entry_count; i++) {
1347                 if (t->entries[i]->tree)
1348                         store_tree(t->entries[i]);
1349         }
1350
1351         if (!(root->versions[0].mode & NO_DELTA))
1352                 le = find_object(&root->versions[0].oid);
1353         if (S_ISDIR(root->versions[0].mode) && le && le->pack_id == pack_id) {
1354                 mktree(t, 0, &old_tree);
1355                 lo.data = old_tree;
1356                 lo.offset = le->idx.offset;
1357                 lo.depth = t->delta_depth;
1358         }
1359
1360         mktree(t, 1, &new_tree);
1361         store_object(OBJ_TREE, &new_tree, &lo, &root->versions[1].oid, 0);
1362
1363         t->delta_depth = lo.depth;
1364         for (i = 0, j = 0, del = 0; i < t->entry_count; i++) {
1365                 struct tree_entry *e = t->entries[i];
1366                 if (e->versions[1].mode) {
1367                         e->versions[0].mode = e->versions[1].mode;
1368                         oidcpy(&e->versions[0].oid, &e->versions[1].oid);
1369                         t->entries[j++] = e;
1370                 } else {
1371                         release_tree_entry(e);
1372                         del++;
1373                 }
1374         }
1375         t->entry_count -= del;
1376 }
1377
1378 static void tree_content_replace(
1379         struct tree_entry *root,
1380         const struct object_id *oid,
1381         const uint16_t mode,
1382         struct tree_content *newtree)
1383 {
1384         if (!S_ISDIR(mode))
1385                 die("Root cannot be a non-directory");
1386         oidclr(&root->versions[0].oid);
1387         oidcpy(&root->versions[1].oid, oid);
1388         if (root->tree)
1389                 release_tree_content_recursive(root->tree);
1390         root->tree = newtree;
1391 }
1392
1393 static int tree_content_set(
1394         struct tree_entry *root,
1395         const char *p,
1396         const struct object_id *oid,
1397         const uint16_t mode,
1398         struct tree_content *subtree)
1399 {
1400         struct tree_content *t;
1401         const char *slash1;
1402         unsigned int i, n;
1403         struct tree_entry *e;
1404
1405         slash1 = strchrnul(p, '/');
1406         n = slash1 - p;
1407         if (!n)
1408                 die("Empty path component found in input");
1409         if (!*slash1 && !S_ISDIR(mode) && subtree)
1410                 die("Non-directories cannot have subtrees");
1411
1412         if (!root->tree)
1413                 load_tree(root);
1414         t = root->tree;
1415         for (i = 0; i < t->entry_count; i++) {
1416                 e = t->entries[i];
1417                 if (e->name->str_len == n && !fspathncmp(p, e->name->str_dat, n)) {
1418                         if (!*slash1) {
1419                                 if (!S_ISDIR(mode)
1420                                                 && e->versions[1].mode == mode
1421                                                 && oideq(&e->versions[1].oid, oid))
1422                                         return 0;
1423                                 e->versions[1].mode = mode;
1424                                 oidcpy(&e->versions[1].oid, oid);
1425                                 if (e->tree)
1426                                         release_tree_content_recursive(e->tree);
1427                                 e->tree = subtree;
1428
1429                                 /*
1430                                  * We need to leave e->versions[0].sha1 alone
1431                                  * to avoid modifying the preimage tree used
1432                                  * when writing out the parent directory.
1433                                  * But after replacing the subdir with a
1434                                  * completely different one, it's not a good
1435                                  * delta base any more, and besides, we've
1436                                  * thrown away the tree entries needed to
1437                                  * make a delta against it.
1438                                  *
1439                                  * So let's just explicitly disable deltas
1440                                  * for the subtree.
1441                                  */
1442                                 if (S_ISDIR(e->versions[0].mode))
1443                                         e->versions[0].mode |= NO_DELTA;
1444
1445                                 oidclr(&root->versions[1].oid);
1446                                 return 1;
1447                         }
1448                         if (!S_ISDIR(e->versions[1].mode)) {
1449                                 e->tree = new_tree_content(8);
1450                                 e->versions[1].mode = S_IFDIR;
1451                         }
1452                         if (!e->tree)
1453                                 load_tree(e);
1454                         if (tree_content_set(e, slash1 + 1, oid, mode, subtree)) {
1455                                 oidclr(&root->versions[1].oid);
1456                                 return 1;
1457                         }
1458                         return 0;
1459                 }
1460         }
1461
1462         if (t->entry_count == t->entry_capacity)
1463                 root->tree = t = grow_tree_content(t, t->entry_count);
1464         e = new_tree_entry();
1465         e->name = to_atom(p, n);
1466         e->versions[0].mode = 0;
1467         oidclr(&e->versions[0].oid);
1468         t->entries[t->entry_count++] = e;
1469         if (*slash1) {
1470                 e->tree = new_tree_content(8);
1471                 e->versions[1].mode = S_IFDIR;
1472                 tree_content_set(e, slash1 + 1, oid, mode, subtree);
1473         } else {
1474                 e->tree = subtree;
1475                 e->versions[1].mode = mode;
1476                 oidcpy(&e->versions[1].oid, oid);
1477         }
1478         oidclr(&root->versions[1].oid);
1479         return 1;
1480 }
1481
1482 static int tree_content_remove(
1483         struct tree_entry *root,
1484         const char *p,
1485         struct tree_entry *backup_leaf,
1486         int allow_root)
1487 {
1488         struct tree_content *t;
1489         const char *slash1;
1490         unsigned int i, n;
1491         struct tree_entry *e;
1492
1493         slash1 = strchrnul(p, '/');
1494         n = slash1 - p;
1495
1496         if (!root->tree)
1497                 load_tree(root);
1498
1499         if (!*p && allow_root) {
1500                 e = root;
1501                 goto del_entry;
1502         }
1503
1504         t = root->tree;
1505         for (i = 0; i < t->entry_count; i++) {
1506                 e = t->entries[i];
1507                 if (e->name->str_len == n && !fspathncmp(p, e->name->str_dat, n)) {
1508                         if (*slash1 && !S_ISDIR(e->versions[1].mode))
1509                                 /*
1510                                  * If p names a file in some subdirectory, and a
1511                                  * file or symlink matching the name of the
1512                                  * parent directory of p exists, then p cannot
1513                                  * exist and need not be deleted.
1514                                  */
1515                                 return 1;
1516                         if (!*slash1 || !S_ISDIR(e->versions[1].mode))
1517                                 goto del_entry;
1518                         if (!e->tree)
1519                                 load_tree(e);
1520                         if (tree_content_remove(e, slash1 + 1, backup_leaf, 0)) {
1521                                 for (n = 0; n < e->tree->entry_count; n++) {
1522                                         if (e->tree->entries[n]->versions[1].mode) {
1523                                                 oidclr(&root->versions[1].oid);
1524                                                 return 1;
1525                                         }
1526                                 }
1527                                 backup_leaf = NULL;
1528                                 goto del_entry;
1529                         }
1530                         return 0;
1531                 }
1532         }
1533         return 0;
1534
1535 del_entry:
1536         if (backup_leaf)
1537                 memcpy(backup_leaf, e, sizeof(*backup_leaf));
1538         else if (e->tree)
1539                 release_tree_content_recursive(e->tree);
1540         e->tree = NULL;
1541         e->versions[1].mode = 0;
1542         oidclr(&e->versions[1].oid);
1543         oidclr(&root->versions[1].oid);
1544         return 1;
1545 }
1546
1547 static int tree_content_get(
1548         struct tree_entry *root,
1549         const char *p,
1550         struct tree_entry *leaf,
1551         int allow_root)
1552 {
1553         struct tree_content *t;
1554         const char *slash1;
1555         unsigned int i, n;
1556         struct tree_entry *e;
1557
1558         slash1 = strchrnul(p, '/');
1559         n = slash1 - p;
1560         if (!n && !allow_root)
1561                 die("Empty path component found in input");
1562
1563         if (!root->tree)
1564                 load_tree(root);
1565
1566         if (!n) {
1567                 e = root;
1568                 goto found_entry;
1569         }
1570
1571         t = root->tree;
1572         for (i = 0; i < t->entry_count; i++) {
1573                 e = t->entries[i];
1574                 if (e->name->str_len == n && !fspathncmp(p, e->name->str_dat, n)) {
1575                         if (!*slash1)
1576                                 goto found_entry;
1577                         if (!S_ISDIR(e->versions[1].mode))
1578                                 return 0;
1579                         if (!e->tree)
1580                                 load_tree(e);
1581                         return tree_content_get(e, slash1 + 1, leaf, 0);
1582                 }
1583         }
1584         return 0;
1585
1586 found_entry:
1587         memcpy(leaf, e, sizeof(*leaf));
1588         if (e->tree && is_null_oid(&e->versions[1].oid))
1589                 leaf->tree = dup_tree_content(e->tree);
1590         else
1591                 leaf->tree = NULL;
1592         return 1;
1593 }
1594
1595 static int update_branch(struct branch *b)
1596 {
1597         static const char *msg = "fast-import";
1598         struct ref_transaction *transaction;
1599         struct object_id old_oid;
1600         struct strbuf err = STRBUF_INIT;
1601
1602         if (is_null_oid(&b->oid)) {
1603                 if (b->delete)
1604                         delete_ref(NULL, b->name, NULL, 0);
1605                 return 0;
1606         }
1607         if (read_ref(b->name, &old_oid))
1608                 oidclr(&old_oid);
1609         if (!force_update && !is_null_oid(&old_oid)) {
1610                 struct commit *old_cmit, *new_cmit;
1611
1612                 old_cmit = lookup_commit_reference_gently(the_repository,
1613                                                           &old_oid, 0);
1614                 new_cmit = lookup_commit_reference_gently(the_repository,
1615                                                           &b->oid, 0);
1616                 if (!old_cmit || !new_cmit)
1617                         return error("Branch %s is missing commits.", b->name);
1618
1619                 if (!in_merge_bases(old_cmit, new_cmit)) {
1620                         warning("Not updating %s"
1621                                 " (new tip %s does not contain %s)",
1622                                 b->name, oid_to_hex(&b->oid),
1623                                 oid_to_hex(&old_oid));
1624                         return -1;
1625                 }
1626         }
1627         transaction = ref_transaction_begin(&err);
1628         if (!transaction ||
1629             ref_transaction_update(transaction, b->name, &b->oid, &old_oid,
1630                                    0, msg, &err) ||
1631             ref_transaction_commit(transaction, &err)) {
1632                 ref_transaction_free(transaction);
1633                 error("%s", err.buf);
1634                 strbuf_release(&err);
1635                 return -1;
1636         }
1637         ref_transaction_free(transaction);
1638         strbuf_release(&err);
1639         return 0;
1640 }
1641
1642 static void dump_branches(void)
1643 {
1644         unsigned int i;
1645         struct branch *b;
1646
1647         for (i = 0; i < branch_table_sz; i++) {
1648                 for (b = branch_table[i]; b; b = b->table_next_branch)
1649                         failure |= update_branch(b);
1650         }
1651 }
1652
1653 static void dump_tags(void)
1654 {
1655         static const char *msg = "fast-import";
1656         struct tag *t;
1657         struct strbuf ref_name = STRBUF_INIT;
1658         struct strbuf err = STRBUF_INIT;
1659         struct ref_transaction *transaction;
1660
1661         transaction = ref_transaction_begin(&err);
1662         if (!transaction) {
1663                 failure |= error("%s", err.buf);
1664                 goto cleanup;
1665         }
1666         for (t = first_tag; t; t = t->next_tag) {
1667                 strbuf_reset(&ref_name);
1668                 strbuf_addf(&ref_name, "refs/tags/%s", t->name);
1669
1670                 if (ref_transaction_update(transaction, ref_name.buf,
1671                                            &t->oid, NULL, 0, msg, &err)) {
1672                         failure |= error("%s", err.buf);
1673                         goto cleanup;
1674                 }
1675         }
1676         if (ref_transaction_commit(transaction, &err))
1677                 failure |= error("%s", err.buf);
1678
1679  cleanup:
1680         ref_transaction_free(transaction);
1681         strbuf_release(&ref_name);
1682         strbuf_release(&err);
1683 }
1684
1685 static void dump_marks(void)
1686 {
1687         struct lock_file mark_lock = LOCK_INIT;
1688         FILE *f;
1689
1690         if (!export_marks_file || (import_marks_file && !import_marks_file_done))
1691                 return;
1692
1693         if (safe_create_leading_directories_const(export_marks_file)) {
1694                 failure |= error_errno("unable to create leading directories of %s",
1695                                        export_marks_file);
1696                 return;
1697         }
1698
1699         if (hold_lock_file_for_update(&mark_lock, export_marks_file, 0) < 0) {
1700                 failure |= error_errno("Unable to write marks file %s",
1701                                        export_marks_file);
1702                 return;
1703         }
1704
1705         f = fdopen_lock_file(&mark_lock, "w");
1706         if (!f) {
1707                 int saved_errno = errno;
1708                 rollback_lock_file(&mark_lock);
1709                 failure |= error("Unable to write marks file %s: %s",
1710                         export_marks_file, strerror(saved_errno));
1711                 return;
1712         }
1713
1714         for_each_mark(marks, 0, dump_marks_fn, f);
1715         if (commit_lock_file(&mark_lock)) {
1716                 failure |= error_errno("Unable to write file %s",
1717                                        export_marks_file);
1718                 return;
1719         }
1720 }
1721
1722 static void insert_object_entry(struct mark_set **s, struct object_id *oid, uintmax_t mark)
1723 {
1724         struct object_entry *e;
1725         e = find_object(oid);
1726         if (!e) {
1727                 enum object_type type = oid_object_info(the_repository,
1728                                                         oid, NULL);
1729                 if (type < 0)
1730                         die("object not found: %s", oid_to_hex(oid));
1731                 e = insert_object(oid);
1732                 e->type = type;
1733                 e->pack_id = MAX_PACK_ID;
1734                 e->idx.offset = 1; /* just not zero! */
1735         }
1736         insert_mark(s, mark, e);
1737 }
1738
1739 static void insert_oid_entry(struct mark_set **s, struct object_id *oid, uintmax_t mark)
1740 {
1741         insert_mark(s, mark, xmemdupz(oid, sizeof(*oid)));
1742 }
1743
1744 static void read_mark_file(struct mark_set **s, FILE *f, mark_set_inserter_t inserter)
1745 {
1746         char line[512];
1747         while (fgets(line, sizeof(line), f)) {
1748                 uintmax_t mark;
1749                 char *end;
1750                 struct object_id oid;
1751
1752                 /* Ensure SHA-1 objects are padded with zeros. */
1753                 memset(oid.hash, 0, sizeof(oid.hash));
1754
1755                 end = strchr(line, '\n');
1756                 if (line[0] != ':' || !end)
1757                         die("corrupt mark line: %s", line);
1758                 *end = 0;
1759                 mark = strtoumax(line + 1, &end, 10);
1760                 if (!mark || end == line + 1
1761                         || *end != ' '
1762                         || get_oid_hex_any(end + 1, &oid) == GIT_HASH_UNKNOWN)
1763                         die("corrupt mark line: %s", line);
1764                 inserter(s, &oid, mark);
1765         }
1766 }
1767
1768 static void read_marks(void)
1769 {
1770         FILE *f = fopen(import_marks_file, "r");
1771         if (f)
1772                 ;
1773         else if (import_marks_file_ignore_missing && errno == ENOENT)
1774                 goto done; /* Marks file does not exist */
1775         else
1776                 die_errno("cannot read '%s'", import_marks_file);
1777         read_mark_file(&marks, f, insert_object_entry);
1778         fclose(f);
1779 done:
1780         import_marks_file_done = 1;
1781 }
1782
1783
1784 static int read_next_command(void)
1785 {
1786         static int stdin_eof = 0;
1787
1788         if (stdin_eof) {
1789                 unread_command_buf = 0;
1790                 return EOF;
1791         }
1792
1793         for (;;) {
1794                 if (unread_command_buf) {
1795                         unread_command_buf = 0;
1796                 } else {
1797                         struct recent_command *rc;
1798
1799                         stdin_eof = strbuf_getline_lf(&command_buf, stdin);
1800                         if (stdin_eof)
1801                                 return EOF;
1802
1803                         if (!seen_data_command
1804                                 && !starts_with(command_buf.buf, "feature ")
1805                                 && !starts_with(command_buf.buf, "option ")) {
1806                                 parse_argv();
1807                         }
1808
1809                         rc = rc_free;
1810                         if (rc)
1811                                 rc_free = rc->next;
1812                         else {
1813                                 rc = cmd_hist.next;
1814                                 cmd_hist.next = rc->next;
1815                                 cmd_hist.next->prev = &cmd_hist;
1816                                 free(rc->buf);
1817                         }
1818
1819                         rc->buf = xstrdup(command_buf.buf);
1820                         rc->prev = cmd_tail;
1821                         rc->next = cmd_hist.prev;
1822                         rc->prev->next = rc;
1823                         cmd_tail = rc;
1824                 }
1825                 if (command_buf.buf[0] == '#')
1826                         continue;
1827                 return 0;
1828         }
1829 }
1830
1831 static void skip_optional_lf(void)
1832 {
1833         int term_char = fgetc(stdin);
1834         if (term_char != '\n' && term_char != EOF)
1835                 ungetc(term_char, stdin);
1836 }
1837
1838 static void parse_mark(void)
1839 {
1840         const char *v;
1841         if (skip_prefix(command_buf.buf, "mark :", &v)) {
1842                 next_mark = strtoumax(v, NULL, 10);
1843                 read_next_command();
1844         }
1845         else
1846                 next_mark = 0;
1847 }
1848
1849 static void parse_original_identifier(void)
1850 {
1851         const char *v;
1852         if (skip_prefix(command_buf.buf, "original-oid ", &v))
1853                 read_next_command();
1854 }
1855
1856 static int parse_data(struct strbuf *sb, uintmax_t limit, uintmax_t *len_res)
1857 {
1858         const char *data;
1859         strbuf_reset(sb);
1860
1861         if (!skip_prefix(command_buf.buf, "data ", &data))
1862                 die("Expected 'data n' command, found: %s", command_buf.buf);
1863
1864         if (skip_prefix(data, "<<", &data)) {
1865                 char *term = xstrdup(data);
1866                 size_t term_len = command_buf.len - (data - command_buf.buf);
1867
1868                 for (;;) {
1869                         if (strbuf_getline_lf(&command_buf, stdin) == EOF)
1870                                 die("EOF in data (terminator '%s' not found)", term);
1871                         if (term_len == command_buf.len
1872                                 && !strcmp(term, command_buf.buf))
1873                                 break;
1874                         strbuf_addbuf(sb, &command_buf);
1875                         strbuf_addch(sb, '\n');
1876                 }
1877                 free(term);
1878         }
1879         else {
1880                 uintmax_t len = strtoumax(data, NULL, 10);
1881                 size_t n = 0, length = (size_t)len;
1882
1883                 if (limit && limit < len) {
1884                         *len_res = len;
1885                         return 0;
1886                 }
1887                 if (length < len)
1888                         die("data is too large to use in this context");
1889
1890                 while (n < length) {
1891                         size_t s = strbuf_fread(sb, length - n, stdin);
1892                         if (!s && feof(stdin))
1893                                 die("EOF in data (%lu bytes remaining)",
1894                                         (unsigned long)(length - n));
1895                         n += s;
1896                 }
1897         }
1898
1899         skip_optional_lf();
1900         return 1;
1901 }
1902
1903 static int validate_raw_date(const char *src, struct strbuf *result, int strict)
1904 {
1905         const char *orig_src = src;
1906         char *endp;
1907         unsigned long num;
1908
1909         errno = 0;
1910
1911         num = strtoul(src, &endp, 10);
1912         /*
1913          * NEEDSWORK: perhaps check for reasonable values? For example, we
1914          *            could error on values representing times more than a
1915          *            day in the future.
1916          */
1917         if (errno || endp == src || *endp != ' ')
1918                 return -1;
1919
1920         src = endp + 1;
1921         if (*src != '-' && *src != '+')
1922                 return -1;
1923
1924         num = strtoul(src + 1, &endp, 10);
1925         /*
1926          * NEEDSWORK: check for brokenness other than num > 1400, such as
1927          *            (num % 100) >= 60, or ((num % 100) % 15) != 0 ?
1928          */
1929         if (errno || endp == src + 1 || *endp || /* did not parse */
1930             (strict && (1400 < num))             /* parsed a broken timezone */
1931            )
1932                 return -1;
1933
1934         strbuf_addstr(result, orig_src);
1935         return 0;
1936 }
1937
1938 static char *parse_ident(const char *buf)
1939 {
1940         const char *ltgt;
1941         size_t name_len;
1942         struct strbuf ident = STRBUF_INIT;
1943
1944         /* ensure there is a space delimiter even if there is no name */
1945         if (*buf == '<')
1946                 --buf;
1947
1948         ltgt = buf + strcspn(buf, "<>");
1949         if (*ltgt != '<')
1950                 die("Missing < in ident string: %s", buf);
1951         if (ltgt != buf && ltgt[-1] != ' ')
1952                 die("Missing space before < in ident string: %s", buf);
1953         ltgt = ltgt + 1 + strcspn(ltgt + 1, "<>");
1954         if (*ltgt != '>')
1955                 die("Missing > in ident string: %s", buf);
1956         ltgt++;
1957         if (*ltgt != ' ')
1958                 die("Missing space after > in ident string: %s", buf);
1959         ltgt++;
1960         name_len = ltgt - buf;
1961         strbuf_add(&ident, buf, name_len);
1962
1963         switch (whenspec) {
1964         case WHENSPEC_RAW:
1965                 if (validate_raw_date(ltgt, &ident, 1) < 0)
1966                         die("Invalid raw date \"%s\" in ident: %s", ltgt, buf);
1967                 break;
1968         case WHENSPEC_RAW_PERMISSIVE:
1969                 if (validate_raw_date(ltgt, &ident, 0) < 0)
1970                         die("Invalid raw date \"%s\" in ident: %s", ltgt, buf);
1971                 break;
1972         case WHENSPEC_RFC2822:
1973                 if (parse_date(ltgt, &ident) < 0)
1974                         die("Invalid rfc2822 date \"%s\" in ident: %s", ltgt, buf);
1975                 break;
1976         case WHENSPEC_NOW:
1977                 if (strcmp("now", ltgt))
1978                         die("Date in ident must be 'now': %s", buf);
1979                 datestamp(&ident);
1980                 break;
1981         }
1982
1983         return strbuf_detach(&ident, NULL);
1984 }
1985
1986 static void parse_and_store_blob(
1987         struct last_object *last,
1988         struct object_id *oidout,
1989         uintmax_t mark)
1990 {
1991         static struct strbuf buf = STRBUF_INIT;
1992         uintmax_t len;
1993
1994         if (parse_data(&buf, big_file_threshold, &len))
1995                 store_object(OBJ_BLOB, &buf, last, oidout, mark);
1996         else {
1997                 if (last) {
1998                         strbuf_release(&last->data);
1999                         last->offset = 0;
2000                         last->depth = 0;
2001                 }
2002                 stream_blob(len, oidout, mark);
2003                 skip_optional_lf();
2004         }
2005 }
2006
2007 static void parse_new_blob(void)
2008 {
2009         read_next_command();
2010         parse_mark();
2011         parse_original_identifier();
2012         parse_and_store_blob(&last_blob, NULL, next_mark);
2013 }
2014
2015 static void unload_one_branch(void)
2016 {
2017         while (cur_active_branches
2018                 && cur_active_branches >= max_active_branches) {
2019                 uintmax_t min_commit = ULONG_MAX;
2020                 struct branch *e, *l = NULL, *p = NULL;
2021
2022                 for (e = active_branches; e; e = e->active_next_branch) {
2023                         if (e->last_commit < min_commit) {
2024                                 p = l;
2025                                 min_commit = e->last_commit;
2026                         }
2027                         l = e;
2028                 }
2029
2030                 if (p) {
2031                         e = p->active_next_branch;
2032                         p->active_next_branch = e->active_next_branch;
2033                 } else {
2034                         e = active_branches;
2035                         active_branches = e->active_next_branch;
2036                 }
2037                 e->active = 0;
2038                 e->active_next_branch = NULL;
2039                 if (e->branch_tree.tree) {
2040                         release_tree_content_recursive(e->branch_tree.tree);
2041                         e->branch_tree.tree = NULL;
2042                 }
2043                 cur_active_branches--;
2044         }
2045 }
2046
2047 static void load_branch(struct branch *b)
2048 {
2049         load_tree(&b->branch_tree);
2050         if (!b->active) {
2051                 b->active = 1;
2052                 b->active_next_branch = active_branches;
2053                 active_branches = b;
2054                 cur_active_branches++;
2055                 branch_load_count++;
2056         }
2057 }
2058
2059 static unsigned char convert_num_notes_to_fanout(uintmax_t num_notes)
2060 {
2061         unsigned char fanout = 0;
2062         while ((num_notes >>= 8))
2063                 fanout++;
2064         return fanout;
2065 }
2066
2067 static void construct_path_with_fanout(const char *hex_sha1,
2068                 unsigned char fanout, char *path)
2069 {
2070         unsigned int i = 0, j = 0;
2071         if (fanout >= the_hash_algo->rawsz)
2072                 die("Too large fanout (%u)", fanout);
2073         while (fanout) {
2074                 path[i++] = hex_sha1[j++];
2075                 path[i++] = hex_sha1[j++];
2076                 path[i++] = '/';
2077                 fanout--;
2078         }
2079         memcpy(path + i, hex_sha1 + j, the_hash_algo->hexsz - j);
2080         path[i + the_hash_algo->hexsz - j] = '\0';
2081 }
2082
2083 static uintmax_t do_change_note_fanout(
2084                 struct tree_entry *orig_root, struct tree_entry *root,
2085                 char *hex_oid, unsigned int hex_oid_len,
2086                 char *fullpath, unsigned int fullpath_len,
2087                 unsigned char fanout)
2088 {
2089         struct tree_content *t;
2090         struct tree_entry *e, leaf;
2091         unsigned int i, tmp_hex_oid_len, tmp_fullpath_len;
2092         uintmax_t num_notes = 0;
2093         struct object_id oid;
2094         /* hex oid + '/' between each pair of hex digits + NUL */
2095         char realpath[GIT_MAX_HEXSZ + ((GIT_MAX_HEXSZ / 2) - 1) + 1];
2096         const unsigned hexsz = the_hash_algo->hexsz;
2097
2098         if (!root->tree)
2099                 load_tree(root);
2100         t = root->tree;
2101
2102         for (i = 0; t && i < t->entry_count; i++) {
2103                 e = t->entries[i];
2104                 tmp_hex_oid_len = hex_oid_len + e->name->str_len;
2105                 tmp_fullpath_len = fullpath_len;
2106
2107                 /*
2108                  * We're interested in EITHER existing note entries (entries
2109                  * with exactly 40 hex chars in path, not including directory
2110                  * separators), OR directory entries that may contain note
2111                  * entries (with < 40 hex chars in path).
2112                  * Also, each path component in a note entry must be a multiple
2113                  * of 2 chars.
2114                  */
2115                 if (!e->versions[1].mode ||
2116                     tmp_hex_oid_len > hexsz ||
2117                     e->name->str_len % 2)
2118                         continue;
2119
2120                 /* This _may_ be a note entry, or a subdir containing notes */
2121                 memcpy(hex_oid + hex_oid_len, e->name->str_dat,
2122                        e->name->str_len);
2123                 if (tmp_fullpath_len)
2124                         fullpath[tmp_fullpath_len++] = '/';
2125                 memcpy(fullpath + tmp_fullpath_len, e->name->str_dat,
2126                        e->name->str_len);
2127                 tmp_fullpath_len += e->name->str_len;
2128                 fullpath[tmp_fullpath_len] = '\0';
2129
2130                 if (tmp_hex_oid_len == hexsz && !get_oid_hex(hex_oid, &oid)) {
2131                         /* This is a note entry */
2132                         if (fanout == 0xff) {
2133                                 /* Counting mode, no rename */
2134                                 num_notes++;
2135                                 continue;
2136                         }
2137                         construct_path_with_fanout(hex_oid, fanout, realpath);
2138                         if (!strcmp(fullpath, realpath)) {
2139                                 /* Note entry is in correct location */
2140                                 num_notes++;
2141                                 continue;
2142                         }
2143
2144                         /* Rename fullpath to realpath */
2145                         if (!tree_content_remove(orig_root, fullpath, &leaf, 0))
2146                                 die("Failed to remove path %s", fullpath);
2147                         tree_content_set(orig_root, realpath,
2148                                 &leaf.versions[1].oid,
2149                                 leaf.versions[1].mode,
2150                                 leaf.tree);
2151                 } else if (S_ISDIR(e->versions[1].mode)) {
2152                         /* This is a subdir that may contain note entries */
2153                         num_notes += do_change_note_fanout(orig_root, e,
2154                                 hex_oid, tmp_hex_oid_len,
2155                                 fullpath, tmp_fullpath_len, fanout);
2156                 }
2157
2158                 /* The above may have reallocated the current tree_content */
2159                 t = root->tree;
2160         }
2161         return num_notes;
2162 }
2163
2164 static uintmax_t change_note_fanout(struct tree_entry *root,
2165                 unsigned char fanout)
2166 {
2167         /*
2168          * The size of path is due to one slash between every two hex digits,
2169          * plus the terminating NUL.  Note that there is no slash at the end, so
2170          * the number of slashes is one less than half the number of hex
2171          * characters.
2172          */
2173         char hex_oid[GIT_MAX_HEXSZ], path[GIT_MAX_HEXSZ + (GIT_MAX_HEXSZ / 2) - 1 + 1];
2174         return do_change_note_fanout(root, root, hex_oid, 0, path, 0, fanout);
2175 }
2176
2177 static int parse_mapped_oid_hex(const char *hex, struct object_id *oid, const char **end)
2178 {
2179         int algo;
2180         khiter_t it;
2181
2182         /* Make SHA-1 object IDs have all-zero padding. */
2183         memset(oid->hash, 0, sizeof(oid->hash));
2184
2185         algo = parse_oid_hex_any(hex, oid, end);
2186         if (algo == GIT_HASH_UNKNOWN)
2187                 return -1;
2188
2189         it = kh_get_oid_map(sub_oid_map, *oid);
2190         /* No such object? */
2191         if (it == kh_end(sub_oid_map)) {
2192                 /* If we're using the same algorithm, pass it through. */
2193                 if (hash_algos[algo].format_id == the_hash_algo->format_id)
2194                         return 0;
2195                 return -1;
2196         }
2197         oidcpy(oid, kh_value(sub_oid_map, it));
2198         return 0;
2199 }
2200
2201 /*
2202  * Given a pointer into a string, parse a mark reference:
2203  *
2204  *   idnum ::= ':' bigint;
2205  *
2206  * Return the first character after the value in *endptr.
2207  *
2208  * Complain if the following character is not what is expected,
2209  * either a space or end of the string.
2210  */
2211 static uintmax_t parse_mark_ref(const char *p, char **endptr)
2212 {
2213         uintmax_t mark;
2214
2215         assert(*p == ':');
2216         p++;
2217         mark = strtoumax(p, endptr, 10);
2218         if (*endptr == p)
2219                 die("No value after ':' in mark: %s", command_buf.buf);
2220         return mark;
2221 }
2222
2223 /*
2224  * Parse the mark reference, and complain if this is not the end of
2225  * the string.
2226  */
2227 static uintmax_t parse_mark_ref_eol(const char *p)
2228 {
2229         char *end;
2230         uintmax_t mark;
2231
2232         mark = parse_mark_ref(p, &end);
2233         if (*end != '\0')
2234                 die("Garbage after mark: %s", command_buf.buf);
2235         return mark;
2236 }
2237
2238 /*
2239  * Parse the mark reference, demanding a trailing space.  Return a
2240  * pointer to the space.
2241  */
2242 static uintmax_t parse_mark_ref_space(const char **p)
2243 {
2244         uintmax_t mark;
2245         char *end;
2246
2247         mark = parse_mark_ref(*p, &end);
2248         if (*end++ != ' ')
2249                 die("Missing space after mark: %s", command_buf.buf);
2250         *p = end;
2251         return mark;
2252 }
2253
2254 static void file_change_m(const char *p, struct branch *b)
2255 {
2256         static struct strbuf uq = STRBUF_INIT;
2257         const char *endp;
2258         struct object_entry *oe;
2259         struct object_id oid;
2260         uint16_t mode, inline_data = 0;
2261
2262         p = get_mode(p, &mode);
2263         if (!p)
2264                 die("Corrupt mode: %s", command_buf.buf);
2265         switch (mode) {
2266         case 0644:
2267         case 0755:
2268                 mode |= S_IFREG;
2269         case S_IFREG | 0644:
2270         case S_IFREG | 0755:
2271         case S_IFLNK:
2272         case S_IFDIR:
2273         case S_IFGITLINK:
2274                 /* ok */
2275                 break;
2276         default:
2277                 die("Corrupt mode: %s", command_buf.buf);
2278         }
2279
2280         if (*p == ':') {
2281                 oe = find_mark(marks, parse_mark_ref_space(&p));
2282                 oidcpy(&oid, &oe->idx.oid);
2283         } else if (skip_prefix(p, "inline ", &p)) {
2284                 inline_data = 1;
2285                 oe = NULL; /* not used with inline_data, but makes gcc happy */
2286         } else {
2287                 if (parse_mapped_oid_hex(p, &oid, &p))
2288                         die("Invalid dataref: %s", command_buf.buf);
2289                 oe = find_object(&oid);
2290                 if (*p++ != ' ')
2291                         die("Missing space after SHA1: %s", command_buf.buf);
2292         }
2293
2294         strbuf_reset(&uq);
2295         if (!unquote_c_style(&uq, p, &endp)) {
2296                 if (*endp)
2297                         die("Garbage after path in: %s", command_buf.buf);
2298                 p = uq.buf;
2299         }
2300
2301         /* Git does not track empty, non-toplevel directories. */
2302         if (S_ISDIR(mode) && is_empty_tree_oid(&oid) && *p) {
2303                 tree_content_remove(&b->branch_tree, p, NULL, 0);
2304                 return;
2305         }
2306
2307         if (S_ISGITLINK(mode)) {
2308                 if (inline_data)
2309                         die("Git links cannot be specified 'inline': %s",
2310                                 command_buf.buf);
2311                 else if (oe) {
2312                         if (oe->type != OBJ_COMMIT)
2313                                 die("Not a commit (actually a %s): %s",
2314                                         type_name(oe->type), command_buf.buf);
2315                 }
2316                 /*
2317                  * Accept the sha1 without checking; it expected to be in
2318                  * another repository.
2319                  */
2320         } else if (inline_data) {
2321                 if (S_ISDIR(mode))
2322                         die("Directories cannot be specified 'inline': %s",
2323                                 command_buf.buf);
2324                 if (p != uq.buf) {
2325                         strbuf_addstr(&uq, p);
2326                         p = uq.buf;
2327                 }
2328                 while (read_next_command() != EOF) {
2329                         const char *v;
2330                         if (skip_prefix(command_buf.buf, "cat-blob ", &v))
2331                                 parse_cat_blob(v);
2332                         else {
2333                                 parse_and_store_blob(&last_blob, &oid, 0);
2334                                 break;
2335                         }
2336                 }
2337         } else {
2338                 enum object_type expected = S_ISDIR(mode) ?
2339                                                 OBJ_TREE: OBJ_BLOB;
2340                 enum object_type type = oe ? oe->type :
2341                                         oid_object_info(the_repository, &oid,
2342                                                         NULL);
2343                 if (type < 0)
2344                         die("%s not found: %s",
2345                                         S_ISDIR(mode) ?  "Tree" : "Blob",
2346                                         command_buf.buf);
2347                 if (type != expected)
2348                         die("Not a %s (actually a %s): %s",
2349                                 type_name(expected), type_name(type),
2350                                 command_buf.buf);
2351         }
2352
2353         if (!*p) {
2354                 tree_content_replace(&b->branch_tree, &oid, mode, NULL);
2355                 return;
2356         }
2357         tree_content_set(&b->branch_tree, p, &oid, mode, NULL);
2358 }
2359
2360 static void file_change_d(const char *p, struct branch *b)
2361 {
2362         static struct strbuf uq = STRBUF_INIT;
2363         const char *endp;
2364
2365         strbuf_reset(&uq);
2366         if (!unquote_c_style(&uq, p, &endp)) {
2367                 if (*endp)
2368                         die("Garbage after path in: %s", command_buf.buf);
2369                 p = uq.buf;
2370         }
2371         tree_content_remove(&b->branch_tree, p, NULL, 1);
2372 }
2373
2374 static void file_change_cr(const char *s, struct branch *b, int rename)
2375 {
2376         const char *d;
2377         static struct strbuf s_uq = STRBUF_INIT;
2378         static struct strbuf d_uq = STRBUF_INIT;
2379         const char *endp;
2380         struct tree_entry leaf;
2381
2382         strbuf_reset(&s_uq);
2383         if (!unquote_c_style(&s_uq, s, &endp)) {
2384                 if (*endp != ' ')
2385                         die("Missing space after source: %s", command_buf.buf);
2386         } else {
2387                 endp = strchr(s, ' ');
2388                 if (!endp)
2389                         die("Missing space after source: %s", command_buf.buf);
2390                 strbuf_add(&s_uq, s, endp - s);
2391         }
2392         s = s_uq.buf;
2393
2394         endp++;
2395         if (!*endp)
2396                 die("Missing dest: %s", command_buf.buf);
2397
2398         d = endp;
2399         strbuf_reset(&d_uq);
2400         if (!unquote_c_style(&d_uq, d, &endp)) {
2401                 if (*endp)
2402                         die("Garbage after dest in: %s", command_buf.buf);
2403                 d = d_uq.buf;
2404         }
2405
2406         memset(&leaf, 0, sizeof(leaf));
2407         if (rename)
2408                 tree_content_remove(&b->branch_tree, s, &leaf, 1);
2409         else
2410                 tree_content_get(&b->branch_tree, s, &leaf, 1);
2411         if (!leaf.versions[1].mode)
2412                 die("Path %s not in branch", s);
2413         if (!*d) {      /* C "path/to/subdir" "" */
2414                 tree_content_replace(&b->branch_tree,
2415                         &leaf.versions[1].oid,
2416                         leaf.versions[1].mode,
2417                         leaf.tree);
2418                 return;
2419         }
2420         tree_content_set(&b->branch_tree, d,
2421                 &leaf.versions[1].oid,
2422                 leaf.versions[1].mode,
2423                 leaf.tree);
2424 }
2425
2426 static void note_change_n(const char *p, struct branch *b, unsigned char *old_fanout)
2427 {
2428         static struct strbuf uq = STRBUF_INIT;
2429         struct object_entry *oe;
2430         struct branch *s;
2431         struct object_id oid, commit_oid;
2432         char path[GIT_MAX_RAWSZ * 3];
2433         uint16_t inline_data = 0;
2434         unsigned char new_fanout;
2435
2436         /*
2437          * When loading a branch, we don't traverse its tree to count the real
2438          * number of notes (too expensive to do this for all non-note refs).
2439          * This means that recently loaded notes refs might incorrectly have
2440          * b->num_notes == 0, and consequently, old_fanout might be wrong.
2441          *
2442          * Fix this by traversing the tree and counting the number of notes
2443          * when b->num_notes == 0. If the notes tree is truly empty, the
2444          * calculation should not take long.
2445          */
2446         if (b->num_notes == 0 && *old_fanout == 0) {
2447                 /* Invoke change_note_fanout() in "counting mode". */
2448                 b->num_notes = change_note_fanout(&b->branch_tree, 0xff);
2449                 *old_fanout = convert_num_notes_to_fanout(b->num_notes);
2450         }
2451
2452         /* Now parse the notemodify command. */
2453         /* <dataref> or 'inline' */
2454         if (*p == ':') {
2455                 oe = find_mark(marks, parse_mark_ref_space(&p));
2456                 oidcpy(&oid, &oe->idx.oid);
2457         } else if (skip_prefix(p, "inline ", &p)) {
2458                 inline_data = 1;
2459                 oe = NULL; /* not used with inline_data, but makes gcc happy */
2460         } else {
2461                 if (parse_mapped_oid_hex(p, &oid, &p))
2462                         die("Invalid dataref: %s", command_buf.buf);
2463                 oe = find_object(&oid);
2464                 if (*p++ != ' ')
2465                         die("Missing space after SHA1: %s", command_buf.buf);
2466         }
2467
2468         /* <commit-ish> */
2469         s = lookup_branch(p);
2470         if (s) {
2471                 if (is_null_oid(&s->oid))
2472                         die("Can't add a note on empty branch.");
2473                 oidcpy(&commit_oid, &s->oid);
2474         } else if (*p == ':') {
2475                 uintmax_t commit_mark = parse_mark_ref_eol(p);
2476                 struct object_entry *commit_oe = find_mark(marks, commit_mark);
2477                 if (commit_oe->type != OBJ_COMMIT)
2478                         die("Mark :%" PRIuMAX " not a commit", commit_mark);
2479                 oidcpy(&commit_oid, &commit_oe->idx.oid);
2480         } else if (!get_oid(p, &commit_oid)) {
2481                 unsigned long size;
2482                 char *buf = read_object_with_reference(the_repository,
2483                                                        &commit_oid,
2484                                                        commit_type, &size,
2485                                                        &commit_oid);
2486                 if (!buf || size < the_hash_algo->hexsz + 6)
2487                         die("Not a valid commit: %s", p);
2488                 free(buf);
2489         } else
2490                 die("Invalid ref name or SHA1 expression: %s", p);
2491
2492         if (inline_data) {
2493                 if (p != uq.buf) {
2494                         strbuf_addstr(&uq, p);
2495                         p = uq.buf;
2496                 }
2497                 read_next_command();
2498                 parse_and_store_blob(&last_blob, &oid, 0);
2499         } else if (oe) {
2500                 if (oe->type != OBJ_BLOB)
2501                         die("Not a blob (actually a %s): %s",
2502                                 type_name(oe->type), command_buf.buf);
2503         } else if (!is_null_oid(&oid)) {
2504                 enum object_type type = oid_object_info(the_repository, &oid,
2505                                                         NULL);
2506                 if (type < 0)
2507                         die("Blob not found: %s", command_buf.buf);
2508                 if (type != OBJ_BLOB)
2509                         die("Not a blob (actually a %s): %s",
2510                             type_name(type), command_buf.buf);
2511         }
2512
2513         construct_path_with_fanout(oid_to_hex(&commit_oid), *old_fanout, path);
2514         if (tree_content_remove(&b->branch_tree, path, NULL, 0))
2515                 b->num_notes--;
2516
2517         if (is_null_oid(&oid))
2518                 return; /* nothing to insert */
2519
2520         b->num_notes++;
2521         new_fanout = convert_num_notes_to_fanout(b->num_notes);
2522         construct_path_with_fanout(oid_to_hex(&commit_oid), new_fanout, path);
2523         tree_content_set(&b->branch_tree, path, &oid, S_IFREG | 0644, NULL);
2524 }
2525
2526 static void file_change_deleteall(struct branch *b)
2527 {
2528         release_tree_content_recursive(b->branch_tree.tree);
2529         oidclr(&b->branch_tree.versions[0].oid);
2530         oidclr(&b->branch_tree.versions[1].oid);
2531         load_tree(&b->branch_tree);
2532         b->num_notes = 0;
2533 }
2534
2535 static void parse_from_commit(struct branch *b, char *buf, unsigned long size)
2536 {
2537         if (!buf || size < the_hash_algo->hexsz + 6)
2538                 die("Not a valid commit: %s", oid_to_hex(&b->oid));
2539         if (memcmp("tree ", buf, 5)
2540                 || get_oid_hex(buf + 5, &b->branch_tree.versions[1].oid))
2541                 die("The commit %s is corrupt", oid_to_hex(&b->oid));
2542         oidcpy(&b->branch_tree.versions[0].oid,
2543                &b->branch_tree.versions[1].oid);
2544 }
2545
2546 static void parse_from_existing(struct branch *b)
2547 {
2548         if (is_null_oid(&b->oid)) {
2549                 oidclr(&b->branch_tree.versions[0].oid);
2550                 oidclr(&b->branch_tree.versions[1].oid);
2551         } else {
2552                 unsigned long size;
2553                 char *buf;
2554
2555                 buf = read_object_with_reference(the_repository,
2556                                                  &b->oid, commit_type, &size,
2557                                                  &b->oid);
2558                 parse_from_commit(b, buf, size);
2559                 free(buf);
2560         }
2561 }
2562
2563 static int parse_objectish(struct branch *b, const char *objectish)
2564 {
2565         struct branch *s;
2566         struct object_id oid;
2567
2568         oidcpy(&oid, &b->branch_tree.versions[1].oid);
2569
2570         s = lookup_branch(objectish);
2571         if (b == s)
2572                 die("Can't create a branch from itself: %s", b->name);
2573         else if (s) {
2574                 struct object_id *t = &s->branch_tree.versions[1].oid;
2575                 oidcpy(&b->oid, &s->oid);
2576                 oidcpy(&b->branch_tree.versions[0].oid, t);
2577                 oidcpy(&b->branch_tree.versions[1].oid, t);
2578         } else if (*objectish == ':') {
2579                 uintmax_t idnum = parse_mark_ref_eol(objectish);
2580                 struct object_entry *oe = find_mark(marks, idnum);
2581                 if (oe->type != OBJ_COMMIT)
2582                         die("Mark :%" PRIuMAX " not a commit", idnum);
2583                 if (!oideq(&b->oid, &oe->idx.oid)) {
2584                         oidcpy(&b->oid, &oe->idx.oid);
2585                         if (oe->pack_id != MAX_PACK_ID) {
2586                                 unsigned long size;
2587                                 char *buf = gfi_unpack_entry(oe, &size);
2588                                 parse_from_commit(b, buf, size);
2589                                 free(buf);
2590                         } else
2591                                 parse_from_existing(b);
2592                 }
2593         } else if (!get_oid(objectish, &b->oid)) {
2594                 parse_from_existing(b);
2595                 if (is_null_oid(&b->oid))
2596                         b->delete = 1;
2597         }
2598         else
2599                 die("Invalid ref name or SHA1 expression: %s", objectish);
2600
2601         if (b->branch_tree.tree && !oideq(&oid, &b->branch_tree.versions[1].oid)) {
2602                 release_tree_content_recursive(b->branch_tree.tree);
2603                 b->branch_tree.tree = NULL;
2604         }
2605
2606         read_next_command();
2607         return 1;
2608 }
2609
2610 static int parse_from(struct branch *b)
2611 {
2612         const char *from;
2613
2614         if (!skip_prefix(command_buf.buf, "from ", &from))
2615                 return 0;
2616
2617         return parse_objectish(b, from);
2618 }
2619
2620 static int parse_objectish_with_prefix(struct branch *b, const char *prefix)
2621 {
2622         const char *base;
2623
2624         if (!skip_prefix(command_buf.buf, prefix, &base))
2625                 return 0;
2626
2627         return parse_objectish(b, base);
2628 }
2629
2630 static struct hash_list *parse_merge(unsigned int *count)
2631 {
2632         struct hash_list *list = NULL, **tail = &list, *n;
2633         const char *from;
2634         struct branch *s;
2635
2636         *count = 0;
2637         while (skip_prefix(command_buf.buf, "merge ", &from)) {
2638                 n = xmalloc(sizeof(*n));
2639                 s = lookup_branch(from);
2640                 if (s)
2641                         oidcpy(&n->oid, &s->oid);
2642                 else if (*from == ':') {
2643                         uintmax_t idnum = parse_mark_ref_eol(from);
2644                         struct object_entry *oe = find_mark(marks, idnum);
2645                         if (oe->type != OBJ_COMMIT)
2646                                 die("Mark :%" PRIuMAX " not a commit", idnum);
2647                         oidcpy(&n->oid, &oe->idx.oid);
2648                 } else if (!get_oid(from, &n->oid)) {
2649                         unsigned long size;
2650                         char *buf = read_object_with_reference(the_repository,
2651                                                                &n->oid,
2652                                                                commit_type,
2653                                                                &size, &n->oid);
2654                         if (!buf || size < the_hash_algo->hexsz + 6)
2655                                 die("Not a valid commit: %s", from);
2656                         free(buf);
2657                 } else
2658                         die("Invalid ref name or SHA1 expression: %s", from);
2659
2660                 n->next = NULL;
2661                 *tail = n;
2662                 tail = &n->next;
2663
2664                 (*count)++;
2665                 read_next_command();
2666         }
2667         return list;
2668 }
2669
2670 static void parse_new_commit(const char *arg)
2671 {
2672         static struct strbuf msg = STRBUF_INIT;
2673         struct branch *b;
2674         char *author = NULL;
2675         char *committer = NULL;
2676         char *encoding = NULL;
2677         struct hash_list *merge_list = NULL;
2678         unsigned int merge_count;
2679         unsigned char prev_fanout, new_fanout;
2680         const char *v;
2681
2682         b = lookup_branch(arg);
2683         if (!b)
2684                 b = new_branch(arg);
2685
2686         read_next_command();
2687         parse_mark();
2688         parse_original_identifier();
2689         if (skip_prefix(command_buf.buf, "author ", &v)) {
2690                 author = parse_ident(v);
2691                 read_next_command();
2692         }
2693         if (skip_prefix(command_buf.buf, "committer ", &v)) {
2694                 committer = parse_ident(v);
2695                 read_next_command();
2696         }
2697         if (!committer)
2698                 die("Expected committer but didn't get one");
2699         if (skip_prefix(command_buf.buf, "encoding ", &v)) {
2700                 encoding = xstrdup(v);
2701                 read_next_command();
2702         }
2703         parse_data(&msg, 0, NULL);
2704         read_next_command();
2705         parse_from(b);
2706         merge_list = parse_merge(&merge_count);
2707
2708         /* ensure the branch is active/loaded */
2709         if (!b->branch_tree.tree || !max_active_branches) {
2710                 unload_one_branch();
2711                 load_branch(b);
2712         }
2713
2714         prev_fanout = convert_num_notes_to_fanout(b->num_notes);
2715
2716         /* file_change* */
2717         while (command_buf.len > 0) {
2718                 if (skip_prefix(command_buf.buf, "M ", &v))
2719                         file_change_m(v, b);
2720                 else if (skip_prefix(command_buf.buf, "D ", &v))
2721                         file_change_d(v, b);
2722                 else if (skip_prefix(command_buf.buf, "R ", &v))
2723                         file_change_cr(v, b, 1);
2724                 else if (skip_prefix(command_buf.buf, "C ", &v))
2725                         file_change_cr(v, b, 0);
2726                 else if (skip_prefix(command_buf.buf, "N ", &v))
2727                         note_change_n(v, b, &prev_fanout);
2728                 else if (!strcmp("deleteall", command_buf.buf))
2729                         file_change_deleteall(b);
2730                 else if (skip_prefix(command_buf.buf, "ls ", &v))
2731                         parse_ls(v, b);
2732                 else if (skip_prefix(command_buf.buf, "cat-blob ", &v))
2733                         parse_cat_blob(v);
2734                 else {
2735                         unread_command_buf = 1;
2736                         break;
2737                 }
2738                 if (read_next_command() == EOF)
2739                         break;
2740         }
2741
2742         new_fanout = convert_num_notes_to_fanout(b->num_notes);
2743         if (new_fanout != prev_fanout)
2744                 b->num_notes = change_note_fanout(&b->branch_tree, new_fanout);
2745
2746         /* build the tree and the commit */
2747         store_tree(&b->branch_tree);
2748         oidcpy(&b->branch_tree.versions[0].oid,
2749                &b->branch_tree.versions[1].oid);
2750
2751         strbuf_reset(&new_data);
2752         strbuf_addf(&new_data, "tree %s\n",
2753                 oid_to_hex(&b->branch_tree.versions[1].oid));
2754         if (!is_null_oid(&b->oid))
2755                 strbuf_addf(&new_data, "parent %s\n",
2756                             oid_to_hex(&b->oid));
2757         while (merge_list) {
2758                 struct hash_list *next = merge_list->next;
2759                 strbuf_addf(&new_data, "parent %s\n",
2760                             oid_to_hex(&merge_list->oid));
2761                 free(merge_list);
2762                 merge_list = next;
2763         }
2764         strbuf_addf(&new_data,
2765                 "author %s\n"
2766                 "committer %s\n",
2767                 author ? author : committer, committer);
2768         if (encoding)
2769                 strbuf_addf(&new_data,
2770                         "encoding %s\n",
2771                         encoding);
2772         strbuf_addch(&new_data, '\n');
2773         strbuf_addbuf(&new_data, &msg);
2774         free(author);
2775         free(committer);
2776         free(encoding);
2777
2778         if (!store_object(OBJ_COMMIT, &new_data, NULL, &b->oid, next_mark))
2779                 b->pack_id = pack_id;
2780         b->last_commit = object_count_by_type[OBJ_COMMIT];
2781 }
2782
2783 static void parse_new_tag(const char *arg)
2784 {
2785         static struct strbuf msg = STRBUF_INIT;
2786         const char *from;
2787         char *tagger;
2788         struct branch *s;
2789         struct tag *t;
2790         uintmax_t from_mark = 0;
2791         struct object_id oid;
2792         enum object_type type;
2793         const char *v;
2794
2795         t = mem_pool_alloc(&fi_mem_pool, sizeof(struct tag));
2796         memset(t, 0, sizeof(struct tag));
2797         t->name = mem_pool_strdup(&fi_mem_pool, arg);
2798         if (last_tag)
2799                 last_tag->next_tag = t;
2800         else
2801                 first_tag = t;
2802         last_tag = t;
2803         read_next_command();
2804         parse_mark();
2805
2806         /* from ... */
2807         if (!skip_prefix(command_buf.buf, "from ", &from))
2808                 die("Expected from command, got %s", command_buf.buf);
2809         s = lookup_branch(from);
2810         if (s) {
2811                 if (is_null_oid(&s->oid))
2812                         die("Can't tag an empty branch.");
2813                 oidcpy(&oid, &s->oid);
2814                 type = OBJ_COMMIT;
2815         } else if (*from == ':') {
2816                 struct object_entry *oe;
2817                 from_mark = parse_mark_ref_eol(from);
2818                 oe = find_mark(marks, from_mark);
2819                 type = oe->type;
2820                 oidcpy(&oid, &oe->idx.oid);
2821         } else if (!get_oid(from, &oid)) {
2822                 struct object_entry *oe = find_object(&oid);
2823                 if (!oe) {
2824                         type = oid_object_info(the_repository, &oid, NULL);
2825                         if (type < 0)
2826                                 die("Not a valid object: %s", from);
2827                 } else
2828                         type = oe->type;
2829         } else
2830                 die("Invalid ref name or SHA1 expression: %s", from);
2831         read_next_command();
2832
2833         /* original-oid ... */
2834         parse_original_identifier();
2835
2836         /* tagger ... */
2837         if (skip_prefix(command_buf.buf, "tagger ", &v)) {
2838                 tagger = parse_ident(v);
2839                 read_next_command();
2840         } else
2841                 tagger = NULL;
2842
2843         /* tag payload/message */
2844         parse_data(&msg, 0, NULL);
2845
2846         /* build the tag object */
2847         strbuf_reset(&new_data);
2848
2849         strbuf_addf(&new_data,
2850                     "object %s\n"
2851                     "type %s\n"
2852                     "tag %s\n",
2853                     oid_to_hex(&oid), type_name(type), t->name);
2854         if (tagger)
2855                 strbuf_addf(&new_data,
2856                             "tagger %s\n", tagger);
2857         strbuf_addch(&new_data, '\n');
2858         strbuf_addbuf(&new_data, &msg);
2859         free(tagger);
2860
2861         if (store_object(OBJ_TAG, &new_data, NULL, &t->oid, next_mark))
2862                 t->pack_id = MAX_PACK_ID;
2863         else
2864                 t->pack_id = pack_id;
2865 }
2866
2867 static void parse_reset_branch(const char *arg)
2868 {
2869         struct branch *b;
2870         const char *tag_name;
2871
2872         b = lookup_branch(arg);
2873         if (b) {
2874                 oidclr(&b->oid);
2875                 oidclr(&b->branch_tree.versions[0].oid);
2876                 oidclr(&b->branch_tree.versions[1].oid);
2877                 if (b->branch_tree.tree) {
2878                         release_tree_content_recursive(b->branch_tree.tree);
2879                         b->branch_tree.tree = NULL;
2880                 }
2881         }
2882         else
2883                 b = new_branch(arg);
2884         read_next_command();
2885         parse_from(b);
2886         if (b->delete && skip_prefix(b->name, "refs/tags/", &tag_name)) {
2887                 /*
2888                  * Elsewhere, we call dump_branches() before dump_tags(),
2889                  * and dump_branches() will handle ref deletions first, so
2890                  * in order to make sure the deletion actually takes effect,
2891                  * we need to remove the tag from our list of tags to update.
2892                  *
2893                  * NEEDSWORK: replace list of tags with hashmap for faster
2894                  * deletion?
2895                  */
2896                 struct tag *t, *prev = NULL;
2897                 for (t = first_tag; t; t = t->next_tag) {
2898                         if (!strcmp(t->name, tag_name))
2899                                 break;
2900                         prev = t;
2901                 }
2902                 if (t) {
2903                         if (prev)
2904                                 prev->next_tag = t->next_tag;
2905                         else
2906                                 first_tag = t->next_tag;
2907                         if (!t->next_tag)
2908                                 last_tag = prev;
2909                         /* There is no mem_pool_free(t) function to call. */
2910                 }
2911         }
2912         if (command_buf.len > 0)
2913                 unread_command_buf = 1;
2914 }
2915
2916 static void cat_blob_write(const char *buf, unsigned long size)
2917 {
2918         if (write_in_full(cat_blob_fd, buf, size) < 0)
2919                 die_errno("Write to frontend failed");
2920 }
2921
2922 static void cat_blob(struct object_entry *oe, struct object_id *oid)
2923 {
2924         struct strbuf line = STRBUF_INIT;
2925         unsigned long size;
2926         enum object_type type = 0;
2927         char *buf;
2928
2929         if (!oe || oe->pack_id == MAX_PACK_ID) {
2930                 buf = read_object_file(oid, &type, &size);
2931         } else {
2932                 type = oe->type;
2933                 buf = gfi_unpack_entry(oe, &size);
2934         }
2935
2936         /*
2937          * Output based on batch_one_object() from cat-file.c.
2938          */
2939         if (type <= 0) {
2940                 strbuf_reset(&line);
2941                 strbuf_addf(&line, "%s missing\n", oid_to_hex(oid));
2942                 cat_blob_write(line.buf, line.len);
2943                 strbuf_release(&line);
2944                 free(buf);
2945                 return;
2946         }
2947         if (!buf)
2948                 die("Can't read object %s", oid_to_hex(oid));
2949         if (type != OBJ_BLOB)
2950                 die("Object %s is a %s but a blob was expected.",
2951                     oid_to_hex(oid), type_name(type));
2952         strbuf_reset(&line);
2953         strbuf_addf(&line, "%s %s %"PRIuMAX"\n", oid_to_hex(oid),
2954                     type_name(type), (uintmax_t)size);
2955         cat_blob_write(line.buf, line.len);
2956         strbuf_release(&line);
2957         cat_blob_write(buf, size);
2958         cat_blob_write("\n", 1);
2959         if (oe && oe->pack_id == pack_id) {
2960                 last_blob.offset = oe->idx.offset;
2961                 strbuf_attach(&last_blob.data, buf, size, size);
2962                 last_blob.depth = oe->depth;
2963         } else
2964                 free(buf);
2965 }
2966
2967 static void parse_get_mark(const char *p)
2968 {
2969         struct object_entry *oe;
2970         char output[GIT_MAX_HEXSZ + 2];
2971
2972         /* get-mark SP <object> LF */
2973         if (*p != ':')
2974                 die("Not a mark: %s", p);
2975
2976         oe = find_mark(marks, parse_mark_ref_eol(p));
2977         if (!oe)
2978                 die("Unknown mark: %s", command_buf.buf);
2979
2980         xsnprintf(output, sizeof(output), "%s\n", oid_to_hex(&oe->idx.oid));
2981         cat_blob_write(output, the_hash_algo->hexsz + 1);
2982 }
2983
2984 static void parse_cat_blob(const char *p)
2985 {
2986         struct object_entry *oe;
2987         struct object_id oid;
2988
2989         /* cat-blob SP <object> LF */
2990         if (*p == ':') {
2991                 oe = find_mark(marks, parse_mark_ref_eol(p));
2992                 if (!oe)
2993                         die("Unknown mark: %s", command_buf.buf);
2994                 oidcpy(&oid, &oe->idx.oid);
2995         } else {
2996                 if (parse_mapped_oid_hex(p, &oid, &p))
2997                         die("Invalid dataref: %s", command_buf.buf);
2998                 if (*p)
2999                         die("Garbage after SHA1: %s", command_buf.buf);
3000                 oe = find_object(&oid);
3001         }
3002
3003         cat_blob(oe, &oid);
3004 }
3005
3006 static struct object_entry *dereference(struct object_entry *oe,
3007                                         struct object_id *oid)
3008 {
3009         unsigned long size;
3010         char *buf = NULL;
3011         const unsigned hexsz = the_hash_algo->hexsz;
3012
3013         if (!oe) {
3014                 enum object_type type = oid_object_info(the_repository, oid,
3015                                                         NULL);
3016                 if (type < 0)
3017                         die("object not found: %s", oid_to_hex(oid));
3018                 /* cache it! */
3019                 oe = insert_object(oid);
3020                 oe->type = type;
3021                 oe->pack_id = MAX_PACK_ID;
3022                 oe->idx.offset = 1;
3023         }
3024         switch (oe->type) {
3025         case OBJ_TREE:  /* easy case. */
3026                 return oe;
3027         case OBJ_COMMIT:
3028         case OBJ_TAG:
3029                 break;
3030         default:
3031                 die("Not a tree-ish: %s", command_buf.buf);
3032         }
3033
3034         if (oe->pack_id != MAX_PACK_ID) {       /* in a pack being written */
3035                 buf = gfi_unpack_entry(oe, &size);
3036         } else {
3037                 enum object_type unused;
3038                 buf = read_object_file(oid, &unused, &size);
3039         }
3040         if (!buf)
3041                 die("Can't load object %s", oid_to_hex(oid));
3042
3043         /* Peel one layer. */
3044         switch (oe->type) {
3045         case OBJ_TAG:
3046                 if (size < hexsz + strlen("object ") ||
3047                     get_oid_hex(buf + strlen("object "), oid))
3048                         die("Invalid SHA1 in tag: %s", command_buf.buf);
3049                 break;
3050         case OBJ_COMMIT:
3051                 if (size < hexsz + strlen("tree ") ||
3052                     get_oid_hex(buf + strlen("tree "), oid))
3053                         die("Invalid SHA1 in commit: %s", command_buf.buf);
3054         }
3055
3056         free(buf);
3057         return find_object(oid);
3058 }
3059
3060 static void insert_mapped_mark(uintmax_t mark, void *object, void *cbp)
3061 {
3062         struct object_id *fromoid = object;
3063         struct object_id *tooid = find_mark(cbp, mark);
3064         int ret;
3065         khiter_t it;
3066
3067         it = kh_put_oid_map(sub_oid_map, *fromoid, &ret);
3068         /* We've already seen this object. */
3069         if (ret == 0)
3070                 return;
3071         kh_value(sub_oid_map, it) = tooid;
3072 }
3073
3074 static void build_mark_map_one(struct mark_set *from, struct mark_set *to)
3075 {
3076         for_each_mark(from, 0, insert_mapped_mark, to);
3077 }
3078
3079 static void build_mark_map(struct string_list *from, struct string_list *to)
3080 {
3081         struct string_list_item *fromp, *top;
3082
3083         sub_oid_map = kh_init_oid_map();
3084
3085         for_each_string_list_item(fromp, from) {
3086                 top = string_list_lookup(to, fromp->string);
3087                 if (!fromp->util) {
3088                         die(_("Missing from marks for submodule '%s'"), fromp->string);
3089                 } else if (!top || !top->util) {
3090                         die(_("Missing to marks for submodule '%s'"), fromp->string);
3091                 }
3092                 build_mark_map_one(fromp->util, top->util);
3093         }
3094 }
3095
3096 static struct object_entry *parse_treeish_dataref(const char **p)
3097 {
3098         struct object_id oid;
3099         struct object_entry *e;
3100
3101         if (**p == ':') {       /* <mark> */
3102                 e = find_mark(marks, parse_mark_ref_space(p));
3103                 if (!e)
3104                         die("Unknown mark: %s", command_buf.buf);
3105                 oidcpy(&oid, &e->idx.oid);
3106         } else {        /* <sha1> */
3107                 if (parse_mapped_oid_hex(*p, &oid, p))
3108                         die("Invalid dataref: %s", command_buf.buf);
3109                 e = find_object(&oid);
3110                 if (*(*p)++ != ' ')
3111                         die("Missing space after tree-ish: %s", command_buf.buf);
3112         }
3113
3114         while (!e || e->type != OBJ_TREE)
3115                 e = dereference(e, &oid);
3116         return e;
3117 }
3118
3119 static void print_ls(int mode, const unsigned char *hash, const char *path)
3120 {
3121         static struct strbuf line = STRBUF_INIT;
3122
3123         /* See show_tree(). */
3124         const char *type =
3125                 S_ISGITLINK(mode) ? commit_type :
3126                 S_ISDIR(mode) ? tree_type :
3127                 blob_type;
3128
3129         if (!mode) {
3130                 /* missing SP path LF */
3131                 strbuf_reset(&line);
3132                 strbuf_addstr(&line, "missing ");
3133                 quote_c_style(path, &line, NULL, 0);
3134                 strbuf_addch(&line, '\n');
3135         } else {
3136                 /* mode SP type SP object_name TAB path LF */
3137                 strbuf_reset(&line);
3138                 strbuf_addf(&line, "%06o %s %s\t",
3139                                 mode & ~NO_DELTA, type, hash_to_hex(hash));
3140                 quote_c_style(path, &line, NULL, 0);
3141                 strbuf_addch(&line, '\n');
3142         }
3143         cat_blob_write(line.buf, line.len);
3144 }
3145
3146 static void parse_ls(const char *p, struct branch *b)
3147 {
3148         struct tree_entry *root = NULL;
3149         struct tree_entry leaf = {NULL};
3150
3151         /* ls SP (<tree-ish> SP)? <path> */
3152         if (*p == '"') {
3153                 if (!b)
3154                         die("Not in a commit: %s", command_buf.buf);
3155                 root = &b->branch_tree;
3156         } else {
3157                 struct object_entry *e = parse_treeish_dataref(&p);
3158                 root = new_tree_entry();
3159                 oidcpy(&root->versions[1].oid, &e->idx.oid);
3160                 if (!is_null_oid(&root->versions[1].oid))
3161                         root->versions[1].mode = S_IFDIR;
3162                 load_tree(root);
3163         }
3164         if (*p == '"') {
3165                 static struct strbuf uq = STRBUF_INIT;
3166                 const char *endp;
3167                 strbuf_reset(&uq);
3168                 if (unquote_c_style(&uq, p, &endp))
3169                         die("Invalid path: %s", command_buf.buf);
3170                 if (*endp)
3171                         die("Garbage after path in: %s", command_buf.buf);
3172                 p = uq.buf;
3173         }
3174         tree_content_get(root, p, &leaf, 1);
3175         /*
3176          * A directory in preparation would have a sha1 of zero
3177          * until it is saved.  Save, for simplicity.
3178          */
3179         if (S_ISDIR(leaf.versions[1].mode))
3180                 store_tree(&leaf);
3181
3182         print_ls(leaf.versions[1].mode, leaf.versions[1].oid.hash, p);
3183         if (leaf.tree)
3184                 release_tree_content_recursive(leaf.tree);
3185         if (!b || root != &b->branch_tree)
3186                 release_tree_entry(root);
3187 }
3188
3189 static void checkpoint(void)
3190 {
3191         checkpoint_requested = 0;
3192         if (object_count) {
3193                 cycle_packfile();
3194         }
3195         dump_branches();
3196         dump_tags();
3197         dump_marks();
3198 }
3199
3200 static void parse_checkpoint(void)
3201 {
3202         checkpoint_requested = 1;
3203         skip_optional_lf();
3204 }
3205
3206 static void parse_progress(void)
3207 {
3208         fwrite(command_buf.buf, 1, command_buf.len, stdout);
3209         fputc('\n', stdout);
3210         fflush(stdout);
3211         skip_optional_lf();
3212 }
3213
3214 static void parse_alias(void)
3215 {
3216         struct object_entry *e;
3217         struct branch b;
3218
3219         skip_optional_lf();
3220         read_next_command();
3221
3222         /* mark ... */
3223         parse_mark();
3224         if (!next_mark)
3225                 die(_("Expected 'mark' command, got %s"), command_buf.buf);
3226
3227         /* to ... */
3228         memset(&b, 0, sizeof(b));
3229         if (!parse_objectish_with_prefix(&b, "to "))
3230                 die(_("Expected 'to' command, got %s"), command_buf.buf);
3231         e = find_object(&b.oid);
3232         assert(e);
3233         insert_mark(&marks, next_mark, e);
3234 }
3235
3236 static char* make_fast_import_path(const char *path)
3237 {
3238         if (!relative_marks_paths || is_absolute_path(path))
3239                 return xstrdup(path);
3240         return git_pathdup("info/fast-import/%s", path);
3241 }
3242
3243 static void option_import_marks(const char *marks,
3244                                         int from_stream, int ignore_missing)
3245 {
3246         if (import_marks_file) {
3247                 if (from_stream)
3248                         die("Only one import-marks command allowed per stream");
3249
3250                 /* read previous mark file */
3251                 if(!import_marks_file_from_stream)
3252                         read_marks();
3253         }
3254
3255         import_marks_file = make_fast_import_path(marks);
3256         import_marks_file_from_stream = from_stream;
3257         import_marks_file_ignore_missing = ignore_missing;
3258 }
3259
3260 static void option_date_format(const char *fmt)
3261 {
3262         if (!strcmp(fmt, "raw"))
3263                 whenspec = WHENSPEC_RAW;
3264         else if (!strcmp(fmt, "raw-permissive"))
3265                 whenspec = WHENSPEC_RAW_PERMISSIVE;
3266         else if (!strcmp(fmt, "rfc2822"))
3267                 whenspec = WHENSPEC_RFC2822;
3268         else if (!strcmp(fmt, "now"))
3269                 whenspec = WHENSPEC_NOW;
3270         else
3271                 die("unknown --date-format argument %s", fmt);
3272 }
3273
3274 static unsigned long ulong_arg(const char *option, const char *arg)
3275 {
3276         char *endptr;
3277         unsigned long rv = strtoul(arg, &endptr, 0);
3278         if (strchr(arg, '-') || endptr == arg || *endptr)
3279                 die("%s: argument must be a non-negative integer", option);
3280         return rv;
3281 }
3282
3283 static void option_depth(const char *depth)
3284 {
3285         max_depth = ulong_arg("--depth", depth);
3286         if (max_depth > MAX_DEPTH)
3287                 die("--depth cannot exceed %u", MAX_DEPTH);
3288 }
3289
3290 static void option_active_branches(const char *branches)
3291 {
3292         max_active_branches = ulong_arg("--active-branches", branches);
3293 }
3294
3295 static void option_export_marks(const char *marks)
3296 {
3297         export_marks_file = make_fast_import_path(marks);
3298 }
3299
3300 static void option_cat_blob_fd(const char *fd)
3301 {
3302         unsigned long n = ulong_arg("--cat-blob-fd", fd);
3303         if (n > (unsigned long) INT_MAX)
3304                 die("--cat-blob-fd cannot exceed %d", INT_MAX);
3305         cat_blob_fd = (int) n;
3306 }
3307
3308 static void option_export_pack_edges(const char *edges)
3309 {
3310         if (pack_edges)
3311                 fclose(pack_edges);
3312         pack_edges = xfopen(edges, "a");
3313 }
3314
3315 static void option_rewrite_submodules(const char *arg, struct string_list *list)
3316 {
3317         struct mark_set *ms;
3318         FILE *fp;
3319         char *s = xstrdup(arg);
3320         char *f = strchr(s, ':');
3321         if (!f)
3322                 die(_("Expected format name:filename for submodule rewrite option"));
3323         *f = '\0';
3324         f++;
3325         ms = xcalloc(1, sizeof(*ms));
3326
3327         fp = fopen(f, "r");
3328         if (!fp)
3329                 die_errno("cannot read '%s'", f);
3330         read_mark_file(&ms, fp, insert_oid_entry);
3331         fclose(fp);
3332
3333         string_list_insert(list, s)->util = ms;
3334 }
3335
3336 static int parse_one_option(const char *option)
3337 {
3338         if (skip_prefix(option, "max-pack-size=", &option)) {
3339                 unsigned long v;
3340                 if (!git_parse_ulong(option, &v))
3341                         return 0;
3342                 if (v < 8192) {
3343                         warning("max-pack-size is now in bytes, assuming --max-pack-size=%lum", v);
3344                         v *= 1024 * 1024;
3345                 } else if (v < 1024 * 1024) {
3346                         warning("minimum max-pack-size is 1 MiB");
3347                         v = 1024 * 1024;
3348                 }
3349                 max_packsize = v;
3350         } else if (skip_prefix(option, "big-file-threshold=", &option)) {
3351                 unsigned long v;
3352                 if (!git_parse_ulong(option, &v))
3353                         return 0;
3354                 big_file_threshold = v;
3355         } else if (skip_prefix(option, "depth=", &option)) {
3356                 option_depth(option);
3357         } else if (skip_prefix(option, "active-branches=", &option)) {
3358                 option_active_branches(option);
3359         } else if (skip_prefix(option, "export-pack-edges=", &option)) {
3360                 option_export_pack_edges(option);
3361         } else if (!strcmp(option, "quiet")) {
3362                 show_stats = 0;
3363         } else if (!strcmp(option, "stats")) {
3364                 show_stats = 1;
3365         } else if (!strcmp(option, "allow-unsafe-features")) {
3366                 ; /* already handled during early option parsing */
3367         } else {
3368                 return 0;
3369         }
3370
3371         return 1;
3372 }
3373
3374 static void check_unsafe_feature(const char *feature, int from_stream)
3375 {
3376         if (from_stream && !allow_unsafe_features)
3377                 die(_("feature '%s' forbidden in input without --allow-unsafe-features"),
3378                     feature);
3379 }
3380
3381 static int parse_one_feature(const char *feature, int from_stream)
3382 {
3383         const char *arg;
3384
3385         if (skip_prefix(feature, "date-format=", &arg)) {
3386                 option_date_format(arg);
3387         } else if (skip_prefix(feature, "import-marks=", &arg)) {
3388                 check_unsafe_feature("import-marks", from_stream);
3389                 option_import_marks(arg, from_stream, 0);
3390         } else if (skip_prefix(feature, "import-marks-if-exists=", &arg)) {
3391                 check_unsafe_feature("import-marks-if-exists", from_stream);
3392                 option_import_marks(arg, from_stream, 1);
3393         } else if (skip_prefix(feature, "export-marks=", &arg)) {
3394                 check_unsafe_feature(feature, from_stream);
3395                 option_export_marks(arg);
3396         } else if (!strcmp(feature, "alias")) {
3397                 ; /* Don't die - this feature is supported */
3398         } else if (skip_prefix(feature, "rewrite-submodules-to=", &arg)) {
3399                 option_rewrite_submodules(arg, &sub_marks_to);
3400         } else if (skip_prefix(feature, "rewrite-submodules-from=", &arg)) {
3401                 option_rewrite_submodules(arg, &sub_marks_from);
3402         } else if (skip_prefix(feature, "rewrite-submodules-from=", &arg)) {
3403         } else if (!strcmp(feature, "get-mark")) {
3404                 ; /* Don't die - this feature is supported */
3405         } else if (!strcmp(feature, "cat-blob")) {
3406                 ; /* Don't die - this feature is supported */
3407         } else if (!strcmp(feature, "relative-marks")) {
3408                 relative_marks_paths = 1;
3409         } else if (!strcmp(feature, "no-relative-marks")) {
3410                 relative_marks_paths = 0;
3411         } else if (!strcmp(feature, "done")) {
3412                 require_explicit_termination = 1;
3413         } else if (!strcmp(feature, "force")) {
3414                 force_update = 1;
3415         } else if (!strcmp(feature, "notes") || !strcmp(feature, "ls")) {
3416                 ; /* do nothing; we have the feature */
3417         } else {
3418                 return 0;
3419         }
3420
3421         return 1;
3422 }
3423
3424 static void parse_feature(const char *feature)
3425 {
3426         if (seen_data_command)
3427                 die("Got feature command '%s' after data command", feature);
3428
3429         if (parse_one_feature(feature, 1))
3430                 return;
3431
3432         die("This version of fast-import does not support feature %s.", feature);
3433 }
3434
3435 static void parse_option(const char *option)
3436 {
3437         if (seen_data_command)
3438                 die("Got option command '%s' after data command", option);
3439
3440         if (parse_one_option(option))
3441                 return;
3442
3443         die("This version of fast-import does not support option: %s", option);
3444 }
3445
3446 static void git_pack_config(void)
3447 {
3448         int indexversion_value;
3449         int limit;
3450         unsigned long packsizelimit_value;
3451
3452         if (!git_config_get_ulong("pack.depth", &max_depth)) {
3453                 if (max_depth > MAX_DEPTH)
3454                         max_depth = MAX_DEPTH;
3455         }
3456         if (!git_config_get_int("pack.indexversion", &indexversion_value)) {
3457                 pack_idx_opts.version = indexversion_value;
3458                 if (pack_idx_opts.version > 2)
3459                         git_die_config("pack.indexversion",
3460                                         "bad pack.indexversion=%"PRIu32, pack_idx_opts.version);
3461         }
3462         if (!git_config_get_ulong("pack.packsizelimit", &packsizelimit_value))
3463                 max_packsize = packsizelimit_value;
3464
3465         if (!git_config_get_int("fastimport.unpacklimit", &limit))
3466                 unpack_limit = limit;
3467         else if (!git_config_get_int("transfer.unpacklimit", &limit))
3468                 unpack_limit = limit;
3469
3470         git_config(git_default_config, NULL);
3471 }
3472
3473 static const char fast_import_usage[] =
3474 "git fast-import [--date-format=<f>] [--max-pack-size=<n>] [--big-file-threshold=<n>] [--depth=<n>] [--active-branches=<n>] [--export-marks=<marks.file>]";
3475
3476 static void parse_argv(void)
3477 {
3478         unsigned int i;
3479
3480         for (i = 1; i < global_argc; i++) {
3481                 const char *a = global_argv[i];
3482
3483                 if (*a != '-' || !strcmp(a, "--"))
3484                         break;
3485
3486                 if (!skip_prefix(a, "--", &a))
3487                         die("unknown option %s", a);
3488
3489                 if (parse_one_option(a))
3490                         continue;
3491
3492                 if (parse_one_feature(a, 0))
3493                         continue;
3494
3495                 if (skip_prefix(a, "cat-blob-fd=", &a)) {
3496                         option_cat_blob_fd(a);
3497                         continue;
3498                 }
3499
3500                 die("unknown option --%s", a);
3501         }
3502         if (i != global_argc)
3503                 usage(fast_import_usage);
3504
3505         seen_data_command = 1;
3506         if (import_marks_file)
3507                 read_marks();
3508         build_mark_map(&sub_marks_from, &sub_marks_to);
3509 }
3510
3511 int cmd_fast_import(int argc, const char **argv, const char *prefix)
3512 {
3513         unsigned int i;
3514
3515         if (argc == 2 && !strcmp(argv[1], "-h"))
3516                 usage(fast_import_usage);
3517
3518         reset_pack_idx_option(&pack_idx_opts);
3519         git_pack_config();
3520
3521         alloc_objects(object_entry_alloc);
3522         strbuf_init(&command_buf, 0);
3523         atom_table = xcalloc(atom_table_sz, sizeof(struct atom_str*));
3524         branch_table = xcalloc(branch_table_sz, sizeof(struct branch*));
3525         avail_tree_table = xcalloc(avail_tree_table_sz, sizeof(struct avail_tree_content*));
3526         marks = mem_pool_calloc(&fi_mem_pool, 1, sizeof(struct mark_set));
3527
3528         hashmap_init(&object_table, object_entry_hashcmp, NULL, 0);
3529
3530         /*
3531          * We don't parse most options until after we've seen the set of
3532          * "feature" lines at the start of the stream (which allows the command
3533          * line to override stream data). But we must do an early parse of any
3534          * command-line options that impact how we interpret the feature lines.
3535          */
3536         for (i = 1; i < argc; i++) {
3537                 const char *arg = argv[i];
3538                 if (*arg != '-' || !strcmp(arg, "--"))
3539                         break;
3540                 if (!strcmp(arg, "--allow-unsafe-features"))
3541                         allow_unsafe_features = 1;
3542         }
3543
3544         global_argc = argc;
3545         global_argv = argv;
3546
3547         rc_free = mem_pool_alloc(&fi_mem_pool, cmd_save * sizeof(*rc_free));
3548         for (i = 0; i < (cmd_save - 1); i++)
3549                 rc_free[i].next = &rc_free[i + 1];
3550         rc_free[cmd_save - 1].next = NULL;
3551
3552         start_packfile();
3553         set_die_routine(die_nicely);
3554         set_checkpoint_signal();
3555         while (read_next_command() != EOF) {
3556                 const char *v;
3557                 if (!strcmp("blob", command_buf.buf))
3558                         parse_new_blob();
3559                 else if (skip_prefix(command_buf.buf, "commit ", &v))
3560                         parse_new_commit(v);
3561                 else if (skip_prefix(command_buf.buf, "tag ", &v))
3562                         parse_new_tag(v);
3563                 else if (skip_prefix(command_buf.buf, "reset ", &v))
3564                         parse_reset_branch(v);
3565                 else if (skip_prefix(command_buf.buf, "ls ", &v))
3566                         parse_ls(v, NULL);
3567                 else if (skip_prefix(command_buf.buf, "cat-blob ", &v))
3568                         parse_cat_blob(v);
3569                 else if (skip_prefix(command_buf.buf, "get-mark ", &v))
3570                         parse_get_mark(v);
3571                 else if (!strcmp("checkpoint", command_buf.buf))
3572                         parse_checkpoint();
3573                 else if (!strcmp("done", command_buf.buf))
3574                         break;
3575                 else if (!strcmp("alias", command_buf.buf))
3576                         parse_alias();
3577                 else if (starts_with(command_buf.buf, "progress "))
3578                         parse_progress();
3579                 else if (skip_prefix(command_buf.buf, "feature ", &v))
3580                         parse_feature(v);
3581                 else if (skip_prefix(command_buf.buf, "option git ", &v))
3582                         parse_option(v);
3583                 else if (starts_with(command_buf.buf, "option "))
3584                         /* ignore non-git options*/;
3585                 else
3586                         die("Unsupported command: %s", command_buf.buf);
3587
3588                 if (checkpoint_requested)
3589                         checkpoint();
3590         }
3591
3592         /* argv hasn't been parsed yet, do so */
3593         if (!seen_data_command)
3594                 parse_argv();
3595
3596         if (require_explicit_termination && feof(stdin))
3597                 die("stream ends early");
3598
3599         end_packfile();
3600
3601         dump_branches();
3602         dump_tags();
3603         unkeep_all_packs();
3604         dump_marks();
3605
3606         if (pack_edges)
3607                 fclose(pack_edges);
3608
3609         if (show_stats) {
3610                 uintmax_t total_count = 0, duplicate_count = 0;
3611                 for (i = 0; i < ARRAY_SIZE(object_count_by_type); i++)
3612                         total_count += object_count_by_type[i];
3613                 for (i = 0; i < ARRAY_SIZE(duplicate_count_by_type); i++)
3614                         duplicate_count += duplicate_count_by_type[i];
3615
3616                 fprintf(stderr, "%s statistics:\n", argv[0]);
3617                 fprintf(stderr, "---------------------------------------------------------------------\n");
3618                 fprintf(stderr, "Alloc'd objects: %10" PRIuMAX "\n", alloc_count);
3619                 fprintf(stderr, "Total objects:   %10" PRIuMAX " (%10" PRIuMAX " duplicates                  )\n", total_count, duplicate_count);
3620                 fprintf(stderr, "      blobs  :   %10" PRIuMAX " (%10" PRIuMAX " duplicates %10" PRIuMAX " deltas of %10" PRIuMAX" attempts)\n", object_count_by_type[OBJ_BLOB], duplicate_count_by_type[OBJ_BLOB], delta_count_by_type[OBJ_BLOB], delta_count_attempts_by_type[OBJ_BLOB]);
3621                 fprintf(stderr, "      trees  :   %10" PRIuMAX " (%10" PRIuMAX " duplicates %10" PRIuMAX " deltas of %10" PRIuMAX" attempts)\n", object_count_by_type[OBJ_TREE], duplicate_count_by_type[OBJ_TREE], delta_count_by_type[OBJ_TREE], delta_count_attempts_by_type[OBJ_TREE]);
3622                 fprintf(stderr, "      commits:   %10" PRIuMAX " (%10" PRIuMAX " duplicates %10" PRIuMAX " deltas of %10" PRIuMAX" attempts)\n", object_count_by_type[OBJ_COMMIT], duplicate_count_by_type[OBJ_COMMIT], delta_count_by_type[OBJ_COMMIT], delta_count_attempts_by_type[OBJ_COMMIT]);
3623                 fprintf(stderr, "      tags   :   %10" PRIuMAX " (%10" PRIuMAX " duplicates %10" PRIuMAX " deltas of %10" PRIuMAX" attempts)\n", object_count_by_type[OBJ_TAG], duplicate_count_by_type[OBJ_TAG], delta_count_by_type[OBJ_TAG], delta_count_attempts_by_type[OBJ_TAG]);
3624                 fprintf(stderr, "Total branches:  %10lu (%10lu loads     )\n", branch_count, branch_load_count);
3625                 fprintf(stderr, "      marks:     %10" PRIuMAX " (%10" PRIuMAX " unique    )\n", (((uintmax_t)1) << marks->shift) * 1024, marks_set_count);
3626                 fprintf(stderr, "      atoms:     %10u\n", atom_cnt);
3627                 fprintf(stderr, "Memory total:    %10" PRIuMAX " KiB\n", (tree_entry_allocd + fi_mem_pool.pool_alloc + alloc_count*sizeof(struct object_entry))/1024);
3628                 fprintf(stderr, "       pools:    %10lu KiB\n", (unsigned long)((tree_entry_allocd + fi_mem_pool.pool_alloc) /1024));
3629                 fprintf(stderr, "     objects:    %10" PRIuMAX " KiB\n", (alloc_count*sizeof(struct object_entry))/1024);
3630                 fprintf(stderr, "---------------------------------------------------------------------\n");
3631                 pack_report();
3632                 fprintf(stderr, "---------------------------------------------------------------------\n");
3633                 fprintf(stderr, "\n");
3634         }
3635
3636         return failure ? 1 : 0;
3637 }