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

   1 /*
   2  * "git fast-export" builtin command
   3  *
   4  * Copyright (C) 2007 Johannes E. Schindelin
   5  */
   6 #include "builtin.h"
   7 #include "cache.h"
   8 #include "config.h"
   9 #include "refs.h"
  10 #include "commit.h"
  11 #include "object.h"
  12 #include "tag.h"
  13 #include "diff.h"
  14 #include "diffcore.h"
  15 #include "log-tree.h"
  16 #include "revision.h"
  17 #include "decorate.h"
  18 #include "string-list.h"
  19 #include "utf8.h"
  20 #include "parse-options.h"
  21 #include "quote.h"
  22 #include "remote.h"
  23 #include "blob.h"
  24
  25 static const char *fast_export_usage[] = {
  26         N_("git fast-export [rev-list-opts]"),
  27         NULL
  28 };
  29
  30 static int progress;
  31 static enum { ABORT, VERBATIM, WARN, WARN_STRIP, STRIP } signed_tag_mode = ABORT;
  32 static enum { ERROR, DROP, REWRITE } tag_of_filtered_mode = ERROR;
  33 static int fake_missing_tagger;
  34 static int use_done_feature;
  35 static int no_data;
  36 static int full_tree;
  37 static struct string_list extra_refs = STRING_LIST_INIT_NODUP;
  38 static struct refspec *refspecs;
  39 static int refspecs_nr;
  40 static int anonymize;
  41
  42 static int parse_opt_signed_tag_mode(const struct option *opt,
  43                                      const char *arg, int unset)
  44 {
  45         if (unset || !strcmp(arg, "abort"))
  46                 signed_tag_mode = ABORT;
  47         else if (!strcmp(arg, "verbatim") || !strcmp(arg, "ignore"))
  48                 signed_tag_mode = VERBATIM;
  49         else if (!strcmp(arg, "warn"))
  50                 signed_tag_mode = WARN;
  51         else if (!strcmp(arg, "warn-strip"))
  52                 signed_tag_mode = WARN_STRIP;
  53         else if (!strcmp(arg, "strip"))
  54                 signed_tag_mode = STRIP;
  55         else
  56                 return error("Unknown signed-tags mode: %s", arg);
  57         return 0;
  58 }
  59
  60 static int parse_opt_tag_of_filtered_mode(const struct option *opt,
  61                                           const char *arg, int unset)
  62 {
  63         if (unset || !strcmp(arg, "abort"))
  64                 tag_of_filtered_mode = ERROR;
  65         else if (!strcmp(arg, "drop"))
  66                 tag_of_filtered_mode = DROP;
  67         else if (!strcmp(arg, "rewrite"))
  68                 tag_of_filtered_mode = REWRITE;
  69         else
  70                 return error("Unknown tag-of-filtered mode: %s", arg);
  71         return 0;
  72 }
  73
  74 static struct decoration idnums;
  75 static uint32_t last_idnum;
  76
  77 static int has_unshown_parent(struct commit *commit)
  78 {
  79         struct commit_list *parent;
  80
  81         for (parent = commit->parents; parent; parent = parent->next)
  82                 if (!(parent->item->object.flags & SHOWN) &&
  83                     !(parent->item->object.flags & UNINTERESTING))
  84                         return 1;
  85         return 0;
  86 }
  87
  88 struct anonymized_entry {
  89         struct hashmap_entry hash;
  90         const char *orig;
  91         size_t orig_len;
  92         const char *anon;
  93         size_t anon_len;
  94 };
  95
  96 static int anonymized_entry_cmp(const void *va, const void *vb,
  97                                 const void *data)
  98 {
  99         const struct anonymized_entry *a = va, *b = vb;
 100         return a->orig_len != b->orig_len ||
 101                 memcmp(a->orig, b->orig, a->orig_len);
 102 }
 103
 104 /*
 105  * Basically keep a cache of X->Y so that we can repeatedly replace
 106  * the same anonymized string with another. The actual generation
 107  * is farmed out to the generate function.
 108  */
 109 static const void *anonymize_mem(struct hashmap *map,
 110                                  void *(*generate)(const void *, size_t *),
 111                                  const void *orig, size_t *len)
 112 {
 113         struct anonymized_entry key, *ret;
 114
 115         if (!map->cmpfn)
 116                 hashmap_init(map, anonymized_entry_cmp, 0);
 117
 118         hashmap_entry_init(&key, memhash(orig, *len));
 119         key.orig = orig;
 120         key.orig_len = *len;
 121         ret = hashmap_get(map, &key, NULL);
 122
 123         if (!ret) {
 124                 ret = xmalloc(sizeof(*ret));
 125                 hashmap_entry_init(&ret->hash, key.hash.hash);
 126                 ret->orig = xstrdup(orig);
 127                 ret->orig_len = *len;
 128                 ret->anon = generate(orig, len);
 129                 ret->anon_len = *len;
 130                 hashmap_put(map, ret);
 131         }
 132
 133         *len = ret->anon_len;
 134         return ret->anon;
 135 }
 136
 137 /*
 138  * We anonymize each component of a path individually,
 139  * so that paths a/b and a/c will share a common root.
 140  * The paths are cached via anonymize_mem so that repeated
 141  * lookups for "a" will yield the same value.
 142  */
 143 static void anonymize_path(struct strbuf *out, const char *path,
 144                            struct hashmap *map,
 145                            void *(*generate)(const void *, size_t *))
 146 {
 147         while (*path) {
 148                 const char *end_of_component = strchrnul(path, '/');
 149                 size_t len = end_of_component - path;
 150                 const char *c = anonymize_mem(map, generate, path, &len);
 151                 strbuf_add(out, c, len);
 152                 path = end_of_component;
 153                 if (*path)
 154                         strbuf_addch(out, *path++);
 155         }
 156 }
 157
 158 /* Since intptr_t is C99, we do not use it here */
 159 static inline uint32_t *mark_to_ptr(uint32_t mark)
 160 {
 161         return ((uint32_t *)NULL) + mark;
 162 }
 163
 164 static inline uint32_t ptr_to_mark(void * mark)
 165 {
 166         return (uint32_t *)mark - (uint32_t *)NULL;
 167 }
 168
 169 static inline void mark_object(struct object *object, uint32_t mark)
 170 {
 171         add_decoration(&idnums, object, mark_to_ptr(mark));
 172 }
 173
 174 static inline void mark_next_object(struct object *object)
 175 {
 176         mark_object(object, ++last_idnum);
 177 }
 178
 179 static int get_object_mark(struct object *object)
 180 {
 181         void *decoration = lookup_decoration(&idnums, object);
 182         if (!decoration)
 183                 return 0;
 184         return ptr_to_mark(decoration);
 185 }
 186
 187 static void show_progress(void)
 188 {
 189         static int counter = 0;
 190         if (!progress)
 191                 return;
 192         if ((++counter % progress) == 0)
 193                 printf("progress %d objects\n", counter);
 194 }
 195
 196 /*
 197  * Ideally we would want some transformation of the blob data here
 198  * that is unreversible, but would still be the same size and have
 199  * the same data relationship to other blobs (so that we get the same
 200  * delta and packing behavior as the original). But the first and last
 201  * requirements there are probably mutually exclusive, so let's take
 202  * the easy way out for now, and just generate arbitrary content.
 203  *
 204  * There's no need to cache this result with anonymize_mem, since
 205  * we already handle blob content caching with marks.
 206  */
 207 static char *anonymize_blob(unsigned long *size)
 208 {
 209         static int counter;
 210         struct strbuf out = STRBUF_INIT;
 211         strbuf_addf(&out, "anonymous blob %d", counter++);
 212         *size = out.len;
 213         return strbuf_detach(&out, NULL);
 214 }
 215
 216 static void export_blob(const struct object_id *oid)
 217 {
 218         unsigned long size;
 219         enum object_type type;
 220         char *buf;
 221         struct object *object;
 222         int eaten;
 223
 224         if (no_data)
 225                 return;
 226
 227         if (is_null_oid(oid))
 228                 return;
 229
 230         object = lookup_object(oid->hash);
 231         if (object && object->flags & SHOWN)
 232                 return;
 233
 234         if (anonymize) {
 235                 buf = anonymize_blob(&size);
 236                 object = (struct object *)lookup_blob(oid);
 237                 eaten = 0;
 238         } else {
 239                 buf = read_sha1_file(oid->hash, &type, &size);
 240                 if (!buf)
 241                         die ("Could not read blob %s", oid_to_hex(oid));
 242                 if (check_sha1_signature(oid->hash, buf, size, typename(type)) < 0)
 243                         die("sha1 mismatch in blob %s", oid_to_hex(oid));
 244                 object = parse_object_buffer(oid, type, size, buf, &eaten);
 245         }
 246
 247         if (!object)
 248                 die("Could not read blob %s", oid_to_hex(oid));
 249
 250         mark_next_object(object);
 251
 252         printf("blob\nmark :%"PRIu32"\ndata %lu\n", last_idnum, size);
 253         if (size && fwrite(buf, size, 1, stdout) != 1)
 254                 die_errno ("Could not write blob '%s'", oid_to_hex(oid));
 255         printf("\n");
 256
 257         show_progress();
 258
 259         object->flags |= SHOWN;
 260         if (!eaten)
 261                 free(buf);
 262 }
 263
 264 static int depth_first(const void *a_, const void *b_)
 265 {
 266         const struct diff_filepair *a = *((const struct diff_filepair **)a_);
 267         const struct diff_filepair *b = *((const struct diff_filepair **)b_);
 268         const char *name_a, *name_b;
 269         int len_a, len_b, len;
 270         int cmp;
 271
 272         name_a = a->one ? a->one->path : a->two->path;
 273         name_b = b->one ? b->one->path : b->two->path;
 274
 275         len_a = strlen(name_a);
 276         len_b = strlen(name_b);
 277         len = (len_a < len_b) ? len_a : len_b;
 278
 279         /* strcmp will sort 'd' before 'd/e', we want 'd/e' before 'd' */
 280         cmp = memcmp(name_a, name_b, len);
 281         if (cmp)
 282                 return cmp;
 283         cmp = len_b - len_a;
 284         if (cmp)
 285                 return cmp;
 286         /*
 287          * Move 'R'ename entries last so that all references of the file
 288          * appear in the output before it is renamed (e.g., when a file
 289          * was copied and renamed in the same commit).
 290          */
 291         return (a->status == 'R') - (b->status == 'R');
 292 }
 293
 294 static void print_path_1(const char *path)
 295 {
 296         int need_quote = quote_c_style(path, NULL, NULL, 0);
 297         if (need_quote)
 298                 quote_c_style(path, NULL, stdout, 0);
 299         else if (strchr(path, ' '))
 300                 printf("\"%s\"", path);
 301         else
 302                 printf("%s", path);
 303 }
 304
 305 static void *anonymize_path_component(const void *path, size_t *len)
 306 {
 307         static int counter;
 308         struct strbuf out = STRBUF_INIT;
 309         strbuf_addf(&out, "path%d", counter++);
 310         return strbuf_detach(&out, len);
 311 }
 312
 313 static void print_path(const char *path)
 314 {
 315         if (!anonymize)
 316                 print_path_1(path);
 317         else {
 318                 static struct hashmap paths;
 319                 static struct strbuf anon = STRBUF_INIT;
 320
 321                 anonymize_path(&anon, path, &paths, anonymize_path_component);
 322                 print_path_1(anon.buf);
 323                 strbuf_reset(&anon);
 324         }
 325 }
 326
 327 static void *generate_fake_oid(const void *old, size_t *len)
 328 {
 329         static uint32_t counter = 1; /* avoid null sha1 */
 330         unsigned char *out = xcalloc(GIT_SHA1_RAWSZ, 1);
 331         put_be32(out + GIT_SHA1_RAWSZ - 4, counter++);
 332         return out;
 333 }
 334
 335 static const unsigned char *anonymize_sha1(const struct object_id *oid)
 336 {
 337         static struct hashmap sha1s;
 338         size_t len = GIT_SHA1_RAWSZ;
 339         return anonymize_mem(&sha1s, generate_fake_oid, oid, &len);
 340 }
 341
 342 static void show_filemodify(struct diff_queue_struct *q,
 343                             struct diff_options *options, void *data)
 344 {
 345         int i;
 346
 347         /*
 348          * Handle files below a directory first, in case they are all deleted
 349          * and the directory changes to a file or symlink.
 350          */
 351         QSORT(q->queue, q->nr, depth_first);
 352
 353         for (i = 0; i < q->nr; i++) {
 354                 struct diff_filespec *ospec = q->queue[i]->one;
 355                 struct diff_filespec *spec = q->queue[i]->two;
 356
 357                 switch (q->queue[i]->status) {
 358                 case DIFF_STATUS_DELETED:
 359                         printf("D ");
 360                         print_path(spec->path);
 361                         putchar('\n');
 362                         break;
 363
 364                 case DIFF_STATUS_COPIED:
 365                 case DIFF_STATUS_RENAMED:
 366                         printf("%c ", q->queue[i]->status);
 367                         print_path(ospec->path);
 368                         putchar(' ');
 369                         print_path(spec->path);
 370                         putchar('\n');
 371
 372                         if (!oidcmp(&ospec->oid, &spec->oid) &&
 373                             ospec->mode == spec->mode)
 374                                 break;
 375                         /* fallthrough */
 376
 377                 case DIFF_STATUS_TYPE_CHANGED:
 378                 case DIFF_STATUS_MODIFIED:
 379                 case DIFF_STATUS_ADDED:
 380                         /*
 381                          * Links refer to objects in another repositories;
 382                          * output the SHA-1 verbatim.
 383                          */
 384                         if (no_data || S_ISGITLINK(spec->mode))
 385                                 printf("M %06o %s ", spec->mode,
 386                                        sha1_to_hex(anonymize ?
 387                                                    anonymize_sha1(&spec->oid) :
 388                                                    spec->oid.hash));
 389                         else {
 390                                 struct object *object = lookup_object(spec->oid.hash);
 391                                 printf("M %06o :%d ", spec->mode,
 392                                        get_object_mark(object));
 393                         }
 394                         print_path(spec->path);
 395                         putchar('\n');
 396                         break;
 397
 398                 default:
 399                         die("Unexpected comparison status '%c' for %s, %s",
 400                                 q->queue[i]->status,
 401                                 ospec->path ? ospec->path : "none",
 402                                 spec->path ? spec->path : "none");
 403                 }
 404         }
 405 }
 406
 407 static const char *find_encoding(const char *begin, const char *end)
 408 {
 409         const char *needle = "\nencoding ";
 410         char *bol, *eol;
 411
 412         bol = memmem(begin, end ? end - begin : strlen(begin),
 413                      needle, strlen(needle));
 414         if (!bol)
 415                 return git_commit_encoding;
 416         bol += strlen(needle);
 417         eol = strchrnul(bol, '\n');
 418         *eol = '\0';
 419         return bol;
 420 }
 421
 422 static void *anonymize_ref_component(const void *old, size_t *len)
 423 {
 424         static int counter;
 425         struct strbuf out = STRBUF_INIT;
 426         strbuf_addf(&out, "ref%d", counter++);
 427         return strbuf_detach(&out, len);
 428 }
 429
 430 static const char *anonymize_refname(const char *refname)
 431 {
 432         /*
 433          * If any of these prefixes is found, we will leave it intact
 434          * so that tags remain tags and so forth.
 435          */
 436         static const char *prefixes[] = {
 437                 "refs/heads/",
 438                 "refs/tags/",
 439                 "refs/remotes/",
 440                 "refs/"
 441         };
 442         static struct hashmap refs;
 443         static struct strbuf anon = STRBUF_INIT;
 444         int i;
 445
 446         /*
 447          * We also leave "master" as a special case, since it does not reveal
 448          * anything interesting.
 449          */
 450         if (!strcmp(refname, "refs/heads/master"))
 451                 return refname;
 452
 453         strbuf_reset(&anon);
 454         for (i = 0; i < ARRAY_SIZE(prefixes); i++) {
 455                 if (skip_prefix(refname, prefixes[i], &refname)) {
 456                         strbuf_addstr(&anon, prefixes[i]);
 457                         break;
 458                 }
 459         }
 460
 461         anonymize_path(&anon, refname, &refs, anonymize_ref_component);
 462         return anon.buf;
 463 }
 464
 465 /*
 466  * We do not even bother to cache commit messages, as they are unlikely
 467  * to be repeated verbatim, and it is not that interesting when they are.
 468  */
 469 static char *anonymize_commit_message(const char *old)
 470 {
 471         static int counter;
 472         return xstrfmt("subject %d\n\nbody\n", counter++);
 473 }
 474
 475 static struct hashmap idents;
 476 static void *anonymize_ident(const void *old, size_t *len)
 477 {
 478         static int counter;
 479         struct strbuf out = STRBUF_INIT;
 480         strbuf_addf(&out, "User %d <user%d@example.com>", counter, counter);
 481         counter++;
 482         return strbuf_detach(&out, len);
 483 }
 484
 485 /*
 486  * Our strategy here is to anonymize the names and email addresses,
 487  * but keep timestamps intact, as they influence things like traversal
 488  * order (and by themselves should not be too revealing).
 489  */
 490 static void anonymize_ident_line(const char **beg, const char **end)
 491 {
 492         static struct strbuf buffers[] = { STRBUF_INIT, STRBUF_INIT };
 493         static unsigned which_buffer;
 494
 495         struct strbuf *out;
 496         struct ident_split split;
 497         const char *end_of_header;
 498
 499         out = &buffers[which_buffer++];
 500         which_buffer %= ARRAY_SIZE(buffers);
 501         strbuf_reset(out);
 502
 503         /* skip "committer", "author", "tagger", etc */
 504         end_of_header = strchr(*beg, ' ');
 505         if (!end_of_header)
 506                 die("BUG: malformed line fed to anonymize_ident_line: %.*s",
 507                     (int)(*end - *beg), *beg);
 508         end_of_header++;
 509         strbuf_add(out, *beg, end_of_header - *beg);
 510
 511         if (!split_ident_line(&split, end_of_header, *end - end_of_header) &&
 512             split.date_begin) {
 513                 const char *ident;
 514                 size_t len;
 515
 516                 len = split.mail_end - split.name_begin;
 517                 ident = anonymize_mem(&idents, anonymize_ident,
 518                                       split.name_begin, &len);
 519                 strbuf_add(out, ident, len);
 520                 strbuf_addch(out, ' ');
 521                 strbuf_add(out, split.date_begin, split.tz_end - split.date_begin);
 522         } else {
 523                 strbuf_addstr(out, "Malformed Ident <malformed@example.com> 0 -0000");
 524         }
 525
 526         *beg = out->buf;
 527         *end = out->buf + out->len;
 528 }
 529
 530 static void handle_commit(struct commit *commit, struct rev_info *rev)
 531 {
 532         int saved_output_format = rev->diffopt.output_format;
 533         const char *commit_buffer;
 534         const char *author, *author_end, *committer, *committer_end;
 535         const char *encoding, *message;
 536         char *reencoded = NULL;
 537         struct commit_list *p;
 538         const char *refname;
 539         int i;
 540
 541         rev->diffopt.output_format = DIFF_FORMAT_CALLBACK;
 542
 543         parse_commit_or_die(commit);
 544         commit_buffer = get_commit_buffer(commit, NULL);
 545         author = strstr(commit_buffer, "\nauthor ");
 546         if (!author)
 547                 die ("Could not find author in commit %s",
 548                      oid_to_hex(&commit->object.oid));
 549         author++;
 550         author_end = strchrnul(author, '\n');
 551         committer = strstr(author_end, "\ncommitter ");
 552         if (!committer)
 553                 die ("Could not find committer in commit %s",
 554                      oid_to_hex(&commit->object.oid));
 555         committer++;
 556         committer_end = strchrnul(committer, '\n');
 557         message = strstr(committer_end, "\n\n");
 558         encoding = find_encoding(committer_end, message);
 559         if (message)
 560                 message += 2;
 561
 562         if (commit->parents &&
 563             get_object_mark(&commit->parents->item->object) != 0 &&
 564             !full_tree) {
 565                 parse_commit_or_die(commit->parents->item);
 566                 diff_tree_oid(&commit->parents->item->tree->object.oid,
 567                               &commit->tree->object.oid, "", &rev->diffopt);
 568         }
 569         else
 570                 diff_root_tree_oid(&commit->tree->object.oid,
 571                                    "", &rev->diffopt);
 572
 573         /* Export the referenced blobs, and remember the marks. */
 574         for (i = 0; i < diff_queued_diff.nr; i++)
 575                 if (!S_ISGITLINK(diff_queued_diff.queue[i]->two->mode))
 576                         export_blob(&diff_queued_diff.queue[i]->two->oid);
 577
 578         refname = commit->util;
 579         if (anonymize) {
 580                 refname = anonymize_refname(refname);
 581                 anonymize_ident_line(&committer, &committer_end);
 582                 anonymize_ident_line(&author, &author_end);
 583         }
 584
 585         mark_next_object(&commit->object);
 586         if (anonymize)
 587                 reencoded = anonymize_commit_message(message);
 588         else if (!is_encoding_utf8(encoding))
 589                 reencoded = reencode_string(message, "UTF-8", encoding);
 590         if (!commit->parents)
 591                 printf("reset %s\n", refname);
 592         printf("commit %s\nmark :%"PRIu32"\n%.*s\n%.*s\ndata %u\n%s",
 593                refname, last_idnum,
 594                (int)(author_end - author), author,
 595                (int)(committer_end - committer), committer,
 596                (unsigned)(reencoded
 597                           ? strlen(reencoded) : message
 598                           ? strlen(message) : 0),
 599                reencoded ? reencoded : message ? message : "");
 600         free(reencoded);
 601         unuse_commit_buffer(commit, commit_buffer);
 602
 603         for (i = 0, p = commit->parents; p; p = p->next) {
 604                 int mark = get_object_mark(&p->item->object);
 605                 if (!mark)
 606                         continue;
 607                 if (i == 0)
 608                         printf("from :%d\n", mark);
 609                 else
 610                         printf("merge :%d\n", mark);
 611                 i++;
 612         }
 613
 614         if (full_tree)
 615                 printf("deleteall\n");
 616         log_tree_diff_flush(rev);
 617         rev->diffopt.output_format = saved_output_format;
 618
 619         printf("\n");
 620
 621         show_progress();
 622 }
 623
 624 static void *anonymize_tag(const void *old, size_t *len)
 625 {
 626         static int counter;
 627         struct strbuf out = STRBUF_INIT;
 628         strbuf_addf(&out, "tag message %d", counter++);
 629         return strbuf_detach(&out, len);
 630 }
 631
 632 static void handle_tail(struct object_array *commits, struct rev_info *revs)
 633 {
 634         struct commit *commit;
 635         while (commits->nr) {
 636                 commit = (struct commit *)commits->objects[commits->nr - 1].item;
 637                 if (has_unshown_parent(commit))
 638                         return;
 639                 handle_commit(commit, revs);
 640                 commits->nr--;
 641         }
 642 }
 643
 644 static void handle_tag(const char *name, struct tag *tag)
 645 {
 646         unsigned long size;
 647         enum object_type type;
 648         char *buf;
 649         const char *tagger, *tagger_end, *message;
 650         size_t message_size = 0;
 651         struct object *tagged;
 652         int tagged_mark;
 653         struct commit *p;
 654
 655         /* Trees have no identifier in fast-export output, thus we have no way
 656          * to output tags of trees, tags of tags of trees, etc.  Simply omit
 657          * such tags.
 658          */
 659         tagged = tag->tagged;
 660         while (tagged->type == OBJ_TAG) {
 661                 tagged = ((struct tag *)tagged)->tagged;
 662         }
 663         if (tagged->type == OBJ_TREE) {
 664                 warning("Omitting tag %s,\nsince tags of trees (or tags of tags of trees, etc.) are not supported.",
 665                         oid_to_hex(&tag->object.oid));
 666                 return;
 667         }
 668
 669         buf = read_sha1_file(tag->object.oid.hash, &type, &size);
 670         if (!buf)
 671                 die ("Could not read tag %s", oid_to_hex(&tag->object.oid));
 672         message = memmem(buf, size, "\n\n", 2);
 673         if (message) {
 674                 message += 2;
 675                 message_size = strlen(message);
 676         }
 677         tagger = memmem(buf, message ? message - buf : size, "\ntagger ", 8);
 678         if (!tagger) {
 679                 if (fake_missing_tagger)
 680                         tagger = "tagger Unspecified Tagger "
 681                                 "<unspecified-tagger> 0 +0000";
 682                 else
 683                         tagger = "";
 684                 tagger_end = tagger + strlen(tagger);
 685         } else {
 686                 tagger++;
 687                 tagger_end = strchrnul(tagger, '\n');
 688                 if (anonymize)
 689                         anonymize_ident_line(&tagger, &tagger_end);
 690         }
 691
 692         if (anonymize) {
 693                 name = anonymize_refname(name);
 694                 if (message) {
 695                         static struct hashmap tags;
 696                         message = anonymize_mem(&tags, anonymize_tag,
 697                                                 message, &message_size);
 698                 }
 699         }
 700
 701         /* handle signed tags */
 702         if (message) {
 703                 const char *signature = strstr(message,
 704                                                "\n-----BEGIN PGP SIGNATURE-----\n");
 705                 if (signature)
 706                         switch(signed_tag_mode) {
 707                         case ABORT:
 708                                 die ("Encountered signed tag %s; use "
 709                                      "--signed-tags=<mode> to handle it.",
 710                                      oid_to_hex(&tag->object.oid));
 711                         case WARN:
 712                                 warning ("Exporting signed tag %s",
 713                                          oid_to_hex(&tag->object.oid));
 714                                 /* fallthru */
 715                         case VERBATIM:
 716                                 break;
 717                         case WARN_STRIP:
 718                                 warning ("Stripping signature from tag %s",
 719                                          oid_to_hex(&tag->object.oid));
 720                                 /* fallthru */
 721                         case STRIP:
 722                                 message_size = signature + 1 - message;
 723                                 break;
 724                         }
 725         }
 726
 727         /* handle tag->tagged having been filtered out due to paths specified */
 728         tagged = tag->tagged;
 729         tagged_mark = get_object_mark(tagged);
 730         if (!tagged_mark) {
 731                 switch(tag_of_filtered_mode) {
 732                 case ABORT:
 733                         die ("Tag %s tags unexported object; use "
 734                              "--tag-of-filtered-object=<mode> to handle it.",
 735                              oid_to_hex(&tag->object.oid));
 736                 case DROP:
 737                         /* Ignore this tag altogether */
 738                         free(buf);
 739                         return;
 740                 case REWRITE:
 741                         if (tagged->type != OBJ_COMMIT) {
 742                                 die ("Tag %s tags unexported %s!",
 743                                      oid_to_hex(&tag->object.oid),
 744                                      typename(tagged->type));
 745                         }
 746                         p = (struct commit *)tagged;
 747                         for (;;) {
 748                                 if (p->parents && p->parents->next)
 749                                         break;
 750                                 if (p->object.flags & UNINTERESTING)
 751                                         break;
 752                                 if (!(p->object.flags & TREESAME))
 753                                         break;
 754                                 if (!p->parents)
 755                                         die ("Can't find replacement commit for tag %s\n",
 756                                              oid_to_hex(&tag->object.oid));
 757                                 p = p->parents->item;
 758                         }
 759                         tagged_mark = get_object_mark(&p->object);
 760                 }
 761         }
 762
 763         if (starts_with(name, "refs/tags/"))
 764                 name += 10;
 765         printf("tag %s\nfrom :%d\n%.*s%sdata %d\n%.*s\n",
 766                name, tagged_mark,
 767                (int)(tagger_end - tagger), tagger,
 768                tagger == tagger_end ? "" : "\n",
 769                (int)message_size, (int)message_size, message ? message : "");
 770         free(buf);
 771 }
 772
 773 static struct commit *get_commit(struct rev_cmdline_entry *e, char *full_name)
 774 {
 775         switch (e->item->type) {
 776         case OBJ_COMMIT:
 777                 return (struct commit *)e->item;
 778         case OBJ_TAG: {
 779                 struct tag *tag = (struct tag *)e->item;
 780
 781                 /* handle nested tags */
 782                 while (tag && tag->object.type == OBJ_TAG) {
 783                         parse_object(&tag->object.oid);
 784                         string_list_append(&extra_refs, full_name)->util = tag;
 785                         tag = (struct tag *)tag->tagged;
 786                 }
 787                 if (!tag)
 788                         die("Tag %s points nowhere?", e->name);
 789                 return (struct commit *)tag;
 790                 break;
 791         }
 792         default:
 793                 return NULL;
 794         }
 795 }
 796
 797 static void get_tags_and_duplicates(struct rev_cmdline_info *info)
 798 {
 799         int i;
 800
 801         for (i = 0; i < info->nr; i++) {
 802                 struct rev_cmdline_entry *e = info->rev + i;
 803                 struct object_id oid;
 804                 struct commit *commit;
 805                 char *full_name;
 806
 807                 if (e->flags & UNINTERESTING)
 808                         continue;
 809
 810                 if (dwim_ref(e->name, strlen(e->name), oid.hash, &full_name) != 1)
 811                         continue;
 812
 813                 if (refspecs) {
 814                         char *private;
 815                         private = apply_refspecs(refspecs, refspecs_nr, full_name);
 816                         if (private) {
 817                                 free(full_name);
 818                                 full_name = private;
 819                         }
 820                 }
 821
 822                 commit = get_commit(e, full_name);
 823                 if (!commit) {
 824                         warning("%s: Unexpected object of type %s, skipping.",
 825                                 e->name,
 826                                 typename(e->item->type));
 827                         continue;
 828                 }
 829
 830                 switch(commit->object.type) {
 831                 case OBJ_COMMIT:
 832                         break;
 833                 case OBJ_BLOB:
 834                         export_blob(&commit->object.oid);
 835                         continue;
 836                 default: /* OBJ_TAG (nested tags) is already handled */
 837                         warning("Tag points to object of unexpected type %s, skipping.",
 838                                 typename(commit->object.type));
 839                         continue;
 840                 }
 841
 842                 /*
 843                  * This ref will not be updated through a commit, lets make
 844                  * sure it gets properly updated eventually.
 845                  */
 846                 if (commit->util || commit->object.flags & SHOWN)
 847                         string_list_append(&extra_refs, full_name)->util = commit;
 848                 if (!commit->util)
 849                         commit->util = full_name;
 850         }
 851 }
 852
 853 static void handle_tags_and_duplicates(void)
 854 {
 855         struct commit *commit;
 856         int i;
 857
 858         for (i = extra_refs.nr - 1; i >= 0; i--) {
 859                 const char *name = extra_refs.items[i].string;
 860                 struct object *object = extra_refs.items[i].util;
 861                 switch (object->type) {
 862                 case OBJ_TAG:
 863                         handle_tag(name, (struct tag *)object);
 864                         break;
 865                 case OBJ_COMMIT:
 866                         if (anonymize)
 867                                 name = anonymize_refname(name);
 868                         /* create refs pointing to already seen commits */
 869                         commit = (struct commit *)object;
 870                         printf("reset %s\nfrom :%d\n\n", name,
 871                                get_object_mark(&commit->object));
 872                         show_progress();
 873                         break;
 874                 }
 875         }
 876 }
 877
 878 static void export_marks(char *file)
 879 {
 880         unsigned int i;
 881         uint32_t mark;
 882         struct object_decoration *deco = idnums.hash;
 883         FILE *f;
 884         int e = 0;
 885
 886         f = fopen_for_writing(file);
 887         if (!f)
 888                 die_errno("Unable to open marks file %s for writing.", file);
 889
 890         for (i = 0; i < idnums.size; i++) {
 891                 if (deco->base && deco->base->type == 1) {
 892                         mark = ptr_to_mark(deco->decoration);
 893                         if (fprintf(f, ":%"PRIu32" %s\n", mark,
 894                                 oid_to_hex(&deco->base->oid)) < 0) {
 895                             e = 1;
 896                             break;
 897                         }
 898                 }
 899                 deco++;
 900         }
 901
 902         e |= ferror(f);
 903         e |= fclose(f);
 904         if (e)
 905                 error("Unable to write marks file %s.", file);
 906 }
 907
 908 static void import_marks(char *input_file)
 909 {
 910         char line[512];
 911         FILE *f = xfopen(input_file, "r");
 912
 913         while (fgets(line, sizeof(line), f)) {
 914                 uint32_t mark;
 915                 char *line_end, *mark_end;
 916                 struct object_id oid;
 917                 struct object *object;
 918                 struct commit *commit;
 919                 enum object_type type;
 920
 921                 line_end = strchr(line, '\n');
 922                 if (line[0] != ':' || !line_end)
 923                         die("corrupt mark line: %s", line);
 924                 *line_end = '\0';
 925
 926                 mark = strtoumax(line + 1, &mark_end, 10);
 927                 if (!mark || mark_end == line + 1
 928                         || *mark_end != ' ' || get_oid_hex(mark_end + 1, &oid))
 929                         die("corrupt mark line: %s", line);
 930
 931                 if (last_idnum < mark)
 932                         last_idnum = mark;
 933
 934                 type = sha1_object_info(oid.hash, NULL);
 935                 if (type < 0)
 936                         die("object not found: %s", oid_to_hex(&oid));
 937
 938                 if (type != OBJ_COMMIT)
 939                         /* only commits */
 940                         continue;
 941
 942                 commit = lookup_commit(&oid);
 943                 if (!commit)
 944                         die("not a commit? can't happen: %s", oid_to_hex(&oid));
 945
 946                 object = &commit->object;
 947
 948                 if (object->flags & SHOWN)
 949                         error("Object %s already has a mark", oid_to_hex(&oid));
 950
 951                 mark_object(object, mark);
 952
 953                 object->flags |= SHOWN;
 954         }
 955         fclose(f);
 956 }
 957
 958 static void handle_deletes(void)
 959 {
 960         int i;
 961         for (i = 0; i < refspecs_nr; i++) {
 962                 struct refspec *refspec = &refspecs[i];
 963                 if (*refspec->src)
 964                         continue;
 965
 966                 printf("reset %s\nfrom %s\n\n",
 967                                 refspec->dst, sha1_to_hex(null_sha1));
 968         }
 969 }
 970
 971 int cmd_fast_export(int argc, const char **argv, const char *prefix)
 972 {
 973         struct rev_info revs;
 974         struct object_array commits = OBJECT_ARRAY_INIT;
 975         struct commit *commit;
 976         char *export_filename = NULL, *import_filename = NULL;
 977         uint32_t lastimportid;
 978         struct string_list refspecs_list = STRING_LIST_INIT_NODUP;
 979         struct option options[] = {
 980                 OPT_INTEGER(0, "progress", &progress,
 981                             N_("show progress after <n> objects")),
 982                 OPT_CALLBACK(0, "signed-tags", &signed_tag_mode, N_("mode"),
 983                              N_("select handling of signed tags"),
 984                              parse_opt_signed_tag_mode),
 985                 OPT_CALLBACK(0, "tag-of-filtered-object", &tag_of_filtered_mode, N_("mode"),
 986                              N_("select handling of tags that tag filtered objects"),
 987                              parse_opt_tag_of_filtered_mode),
 988                 OPT_STRING(0, "export-marks", &export_filename, N_("file"),
 989                              N_("Dump marks to this file")),
 990                 OPT_STRING(0, "import-marks", &import_filename, N_("file"),
 991                              N_("Import marks from this file")),
 992                 OPT_BOOL(0, "fake-missing-tagger", &fake_missing_tagger,
 993                          N_("Fake a tagger when tags lack one")),
 994                 OPT_BOOL(0, "full-tree", &full_tree,
 995                          N_("Output full tree for each commit")),
 996                 OPT_BOOL(0, "use-done-feature", &use_done_feature,
 997                              N_("Use the done feature to terminate the stream")),
 998                 OPT_BOOL(0, "no-data", &no_data, N_("Skip output of blob data")),
 999                 OPT_STRING_LIST(0, "refspec", &refspecs_list, N_("refspec"),
1000                              N_("Apply refspec to exported refs")),
1001                 OPT_BOOL(0, "anonymize", &anonymize, N_("anonymize output")),
1002                 OPT_END()
1003         };
1004
1005         if (argc == 1)
1006                 usage_with_options (fast_export_usage, options);
1007
1008         /* we handle encodings */
1009         git_config(git_default_config, NULL);
1010
1011         init_revisions(&revs, prefix);
1012         revs.topo_order = 1;
1013         revs.show_source = 1;
1014         revs.rewrite_parents = 1;
1015         argc = parse_options(argc, argv, prefix, options, fast_export_usage,
1016                         PARSE_OPT_KEEP_ARGV0 | PARSE_OPT_KEEP_UNKNOWN);
1017         argc = setup_revisions(argc, argv, &revs, NULL);
1018         if (argc > 1)
1019                 usage_with_options (fast_export_usage, options);
1020
1021         if (refspecs_list.nr) {
1022                 const char **refspecs_str;
1023                 int i;
1024
1025                 ALLOC_ARRAY(refspecs_str, refspecs_list.nr);
1026                 for (i = 0; i < refspecs_list.nr; i++)
1027                         refspecs_str[i] = refspecs_list.items[i].string;
1028
1029                 refspecs_nr = refspecs_list.nr;
1030                 refspecs = parse_fetch_refspec(refspecs_nr, refspecs_str);
1031
1032                 string_list_clear(&refspecs_list, 1);
1033                 free(refspecs_str);
1034         }
1035
1036         if (use_done_feature)
1037                 printf("feature done\n");
1038
1039         if (import_filename)
1040                 import_marks(import_filename);
1041         lastimportid = last_idnum;
1042
1043         if (import_filename && revs.prune_data.nr)
1044                 full_tree = 1;
1045
1046         get_tags_and_duplicates(&revs.cmdline);
1047
1048         if (prepare_revision_walk(&revs))
1049                 die("revision walk setup failed");
1050         revs.diffopt.format_callback = show_filemodify;
1051         DIFF_OPT_SET(&revs.diffopt, RECURSIVE);
1052         while ((commit = get_revision(&revs))) {
1053                 if (has_unshown_parent(commit)) {
1054                         add_object_array(&commit->object, NULL, &commits);
1055                 }
1056                 else {
1057                         handle_commit(commit, &revs);
1058                         handle_tail(&commits, &revs);
1059                 }
1060         }
1061
1062         handle_tags_and_duplicates();
1063         handle_deletes();
1064
1065         if (export_filename && lastimportid != last_idnum)
1066                 export_marks(export_filename);
1067
1068         if (use_done_feature)
1069                 printf("done\n");
1070
1071         free_refspec(refspecs_nr, refspecs);
1072
1073         return 0;
1074 }