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 "commit.h"
   9 #include "object.h"
  10 #include "tag.h"
  11 #include "diff.h"
  12 #include "diffcore.h"
  13 #include "log-tree.h"
  14 #include "revision.h"
  15 #include "decorate.h"
  16 #include "string-list.h"
  17 #include "utf8.h"
  18 #include "parse-options.h"
  19 #include "quote.h"
  20
  21 static const char *fast_export_usage[] = {
  22         N_("git fast-export [rev-list-opts]"),
  23         NULL
  24 };
  25
  26 static int progress;
  27 static enum { ABORT, VERBATIM, WARN, WARN_STRIP, STRIP } signed_tag_mode = ABORT;
  28 static enum { ERROR, DROP, REWRITE } tag_of_filtered_mode = ERROR;
  29 static int fake_missing_tagger;
  30 static int use_done_feature;
  31 static int no_data;
  32 static int full_tree;
  33 static struct string_list extra_refs = STRING_LIST_INIT_NODUP;
  34
  35 static int parse_opt_signed_tag_mode(const struct option *opt,
  36                                      const char *arg, int unset)
  37 {
  38         if (unset || !strcmp(arg, "abort"))
  39                 signed_tag_mode = ABORT;
  40         else if (!strcmp(arg, "verbatim") || !strcmp(arg, "ignore"))
  41                 signed_tag_mode = VERBATIM;
  42         else if (!strcmp(arg, "warn"))
  43                 signed_tag_mode = WARN;
  44         else if (!strcmp(arg, "warn-strip"))
  45                 signed_tag_mode = WARN_STRIP;
  46         else if (!strcmp(arg, "strip"))
  47                 signed_tag_mode = STRIP;
  48         else
  49                 return error("Unknown signed-tags mode: %s", arg);
  50         return 0;
  51 }
  52
  53 static int parse_opt_tag_of_filtered_mode(const struct option *opt,
  54                                           const char *arg, int unset)
  55 {
  56         if (unset || !strcmp(arg, "abort"))
  57                 tag_of_filtered_mode = ERROR;
  58         else if (!strcmp(arg, "drop"))
  59                 tag_of_filtered_mode = DROP;
  60         else if (!strcmp(arg, "rewrite"))
  61                 tag_of_filtered_mode = REWRITE;
  62         else
  63                 return error("Unknown tag-of-filtered mode: %s", arg);
  64         return 0;
  65 }
  66
  67 static struct decoration idnums;
  68 static uint32_t last_idnum;
  69
  70 static int has_unshown_parent(struct commit *commit)
  71 {
  72         struct commit_list *parent;
  73
  74         for (parent = commit->parents; parent; parent = parent->next)
  75                 if (!(parent->item->object.flags & SHOWN) &&
  76                     !(parent->item->object.flags & UNINTERESTING))
  77                         return 1;
  78         return 0;
  79 }
  80
  81 /* Since intptr_t is C99, we do not use it here */
  82 static inline uint32_t *mark_to_ptr(uint32_t mark)
  83 {
  84         return ((uint32_t *)NULL) + mark;
  85 }
  86
  87 static inline uint32_t ptr_to_mark(void * mark)
  88 {
  89         return (uint32_t *)mark - (uint32_t *)NULL;
  90 }
  91
  92 static inline void mark_object(struct object *object, uint32_t mark)
  93 {
  94         add_decoration(&idnums, object, mark_to_ptr(mark));
  95 }
  96
  97 static inline void mark_next_object(struct object *object)
  98 {
  99         mark_object(object, ++last_idnum);
 100 }
 101
 102 static int get_object_mark(struct object *object)
 103 {
 104         void *decoration = lookup_decoration(&idnums, object);
 105         if (!decoration)
 106                 return 0;
 107         return ptr_to_mark(decoration);
 108 }
 109
 110 static void show_progress(void)
 111 {
 112         static int counter = 0;
 113         if (!progress)
 114                 return;
 115         if ((++counter % progress) == 0)
 116                 printf("progress %d objects\n", counter);
 117 }
 118
 119 static void export_blob(const unsigned char *sha1)
 120 {
 121         unsigned long size;
 122         enum object_type type;
 123         char *buf;
 124         struct object *object;
 125         int eaten;
 126
 127         if (no_data)
 128                 return;
 129
 130         if (is_null_sha1(sha1))
 131                 return;
 132
 133         object = lookup_object(sha1);
 134         if (object && object->flags & SHOWN)
 135                 return;
 136
 137         buf = read_sha1_file(sha1, &type, &size);
 138         if (!buf)
 139                 die ("Could not read blob %s", sha1_to_hex(sha1));
 140         if (check_sha1_signature(sha1, buf, size, typename(type)) < 0)
 141                 die("sha1 mismatch in blob %s", sha1_to_hex(sha1));
 142         object = parse_object_buffer(sha1, type, size, buf, &eaten);
 143         if (!object)
 144                 die("Could not read blob %s", sha1_to_hex(sha1));
 145
 146         mark_next_object(object);
 147
 148         printf("blob\nmark :%"PRIu32"\ndata %lu\n", last_idnum, size);
 149         if (size && fwrite(buf, size, 1, stdout) != 1)
 150                 die_errno ("Could not write blob '%s'", sha1_to_hex(sha1));
 151         printf("\n");
 152
 153         show_progress();
 154
 155         object->flags |= SHOWN;
 156         if (!eaten)
 157                 free(buf);
 158 }
 159
 160 static int depth_first(const void *a_, const void *b_)
 161 {
 162         const struct diff_filepair *a = *((const struct diff_filepair **)a_);
 163         const struct diff_filepair *b = *((const struct diff_filepair **)b_);
 164         const char *name_a, *name_b;
 165         int len_a, len_b, len;
 166         int cmp;
 167
 168         name_a = a->one ? a->one->path : a->two->path;
 169         name_b = b->one ? b->one->path : b->two->path;
 170
 171         len_a = strlen(name_a);
 172         len_b = strlen(name_b);
 173         len = (len_a < len_b) ? len_a : len_b;
 174
 175         /* strcmp will sort 'd' before 'd/e', we want 'd/e' before 'd' */
 176         cmp = memcmp(name_a, name_b, len);
 177         if (cmp)
 178                 return cmp;
 179         cmp = len_b - len_a;
 180         if (cmp)
 181                 return cmp;
 182         /*
 183          * Move 'R'ename entries last so that all references of the file
 184          * appear in the output before it is renamed (e.g., when a file
 185          * was copied and renamed in the same commit).
 186          */
 187         return (a->status == 'R') - (b->status == 'R');
 188 }
 189
 190 static void print_path(const char *path)
 191 {
 192         int need_quote = quote_c_style(path, NULL, NULL, 0);
 193         if (need_quote)
 194                 quote_c_style(path, NULL, stdout, 0);
 195         else if (strchr(path, ' '))
 196                 printf("\"%s\"", path);
 197         else
 198                 printf("%s", path);
 199 }
 200
 201 static void show_filemodify(struct diff_queue_struct *q,
 202                             struct diff_options *options, void *data)
 203 {
 204         int i;
 205
 206         /*
 207          * Handle files below a directory first, in case they are all deleted
 208          * and the directory changes to a file or symlink.
 209          */
 210         qsort(q->queue, q->nr, sizeof(q->queue[0]), depth_first);
 211
 212         for (i = 0; i < q->nr; i++) {
 213                 struct diff_filespec *ospec = q->queue[i]->one;
 214                 struct diff_filespec *spec = q->queue[i]->two;
 215
 216                 switch (q->queue[i]->status) {
 217                 case DIFF_STATUS_DELETED:
 218                         printf("D ");
 219                         print_path(spec->path);
 220                         putchar('\n');
 221                         break;
 222
 223                 case DIFF_STATUS_COPIED:
 224                 case DIFF_STATUS_RENAMED:
 225                         printf("%c ", q->queue[i]->status);
 226                         print_path(ospec->path);
 227                         putchar(' ');
 228                         print_path(spec->path);
 229                         putchar('\n');
 230
 231                         if (!hashcmp(ospec->sha1, spec->sha1) &&
 232                             ospec->mode == spec->mode)
 233                                 break;
 234                         /* fallthrough */
 235
 236                 case DIFF_STATUS_TYPE_CHANGED:
 237                 case DIFF_STATUS_MODIFIED:
 238                 case DIFF_STATUS_ADDED:
 239                         /*
 240                          * Links refer to objects in another repositories;
 241                          * output the SHA-1 verbatim.
 242                          */
 243                         if (no_data || S_ISGITLINK(spec->mode))
 244                                 printf("M %06o %s ", spec->mode,
 245                                        sha1_to_hex(spec->sha1));
 246                         else {
 247                                 struct object *object = lookup_object(spec->sha1);
 248                                 printf("M %06o :%d ", spec->mode,
 249                                        get_object_mark(object));
 250                         }
 251                         print_path(spec->path);
 252                         putchar('\n');
 253                         break;
 254
 255                 default:
 256                         die("Unexpected comparison status '%c' for %s, %s",
 257                                 q->queue[i]->status,
 258                                 ospec->path ? ospec->path : "none",
 259                                 spec->path ? spec->path : "none");
 260                 }
 261         }
 262 }
 263
 264 static const char *find_encoding(const char *begin, const char *end)
 265 {
 266         const char *needle = "\nencoding ";
 267         char *bol, *eol;
 268
 269         bol = memmem(begin, end ? end - begin : strlen(begin),
 270                      needle, strlen(needle));
 271         if (!bol)
 272                 return git_commit_encoding;
 273         bol += strlen(needle);
 274         eol = strchrnul(bol, '\n');
 275         *eol = '\0';
 276         return bol;
 277 }
 278
 279 static void handle_commit(struct commit *commit, struct rev_info *rev)
 280 {
 281         int saved_output_format = rev->diffopt.output_format;
 282         const char *author, *author_end, *committer, *committer_end;
 283         const char *encoding, *message;
 284         char *reencoded = NULL;
 285         struct commit_list *p;
 286         int i;
 287
 288         rev->diffopt.output_format = DIFF_FORMAT_CALLBACK;
 289
 290         parse_commit_or_die(commit);
 291         author = strstr(commit->buffer, "\nauthor ");
 292         if (!author)
 293                 die ("Could not find author in commit %s",
 294                      sha1_to_hex(commit->object.sha1));
 295         author++;
 296         author_end = strchrnul(author, '\n');
 297         committer = strstr(author_end, "\ncommitter ");
 298         if (!committer)
 299                 die ("Could not find committer in commit %s",
 300                      sha1_to_hex(commit->object.sha1));
 301         committer++;
 302         committer_end = strchrnul(committer, '\n');
 303         message = strstr(committer_end, "\n\n");
 304         encoding = find_encoding(committer_end, message);
 305         if (message)
 306                 message += 2;
 307
 308         if (commit->parents &&
 309             get_object_mark(&commit->parents->item->object) != 0 &&
 310             !full_tree) {
 311                 parse_commit_or_die(commit->parents->item);
 312                 diff_tree_sha1(commit->parents->item->tree->object.sha1,
 313                                commit->tree->object.sha1, "", &rev->diffopt);
 314         }
 315         else
 316                 diff_root_tree_sha1(commit->tree->object.sha1,
 317                                     "", &rev->diffopt);
 318
 319         /* Export the referenced blobs, and remember the marks. */
 320         for (i = 0; i < diff_queued_diff.nr; i++)
 321                 if (!S_ISGITLINK(diff_queued_diff.queue[i]->two->mode))
 322                         export_blob(diff_queued_diff.queue[i]->two->sha1);
 323
 324         mark_next_object(&commit->object);
 325         if (!is_encoding_utf8(encoding))
 326                 reencoded = reencode_string(message, "UTF-8", encoding);
 327         if (!commit->parents)
 328                 printf("reset %s\n", (const char*)commit->util);
 329         printf("commit %s\nmark :%"PRIu32"\n%.*s\n%.*s\ndata %u\n%s",
 330                (const char *)commit->util, last_idnum,
 331                (int)(author_end - author), author,
 332                (int)(committer_end - committer), committer,
 333                (unsigned)(reencoded
 334                           ? strlen(reencoded) : message
 335                           ? strlen(message) : 0),
 336                reencoded ? reencoded : message ? message : "");
 337         free(reencoded);
 338
 339         for (i = 0, p = commit->parents; p; p = p->next) {
 340                 int mark = get_object_mark(&p->item->object);
 341                 if (!mark)
 342                         continue;
 343                 if (i == 0)
 344                         printf("from :%d\n", mark);
 345                 else
 346                         printf("merge :%d\n", mark);
 347                 i++;
 348         }
 349
 350         if (full_tree)
 351                 printf("deleteall\n");
 352         log_tree_diff_flush(rev);
 353         rev->diffopt.output_format = saved_output_format;
 354
 355         printf("\n");
 356
 357         show_progress();
 358 }
 359
 360 static void handle_tail(struct object_array *commits, struct rev_info *revs)
 361 {
 362         struct commit *commit;
 363         while (commits->nr) {
 364                 commit = (struct commit *)commits->objects[commits->nr - 1].item;
 365                 if (has_unshown_parent(commit))
 366                         return;
 367                 handle_commit(commit, revs);
 368                 commits->nr--;
 369         }
 370 }
 371
 372 static void handle_tag(const char *name, struct tag *tag)
 373 {
 374         unsigned long size;
 375         enum object_type type;
 376         char *buf;
 377         const char *tagger, *tagger_end, *message;
 378         size_t message_size = 0;
 379         struct object *tagged;
 380         int tagged_mark;
 381         struct commit *p;
 382
 383         /* Trees have no identifier in fast-export output, thus we have no way
 384          * to output tags of trees, tags of tags of trees, etc.  Simply omit
 385          * such tags.
 386          */
 387         tagged = tag->tagged;
 388         while (tagged->type == OBJ_TAG) {
 389                 tagged = ((struct tag *)tagged)->tagged;
 390         }
 391         if (tagged->type == OBJ_TREE) {
 392                 warning("Omitting tag %s,\nsince tags of trees (or tags of tags of trees, etc.) are not supported.",
 393                         sha1_to_hex(tag->object.sha1));
 394                 return;
 395         }
 396
 397         buf = read_sha1_file(tag->object.sha1, &type, &size);
 398         if (!buf)
 399                 die ("Could not read tag %s", sha1_to_hex(tag->object.sha1));
 400         message = memmem(buf, size, "\n\n", 2);
 401         if (message) {
 402                 message += 2;
 403                 message_size = strlen(message);
 404         }
 405         tagger = memmem(buf, message ? message - buf : size, "\ntagger ", 8);
 406         if (!tagger) {
 407                 if (fake_missing_tagger)
 408                         tagger = "tagger Unspecified Tagger "
 409                                 "<unspecified-tagger> 0 +0000";
 410                 else
 411                         tagger = "";
 412                 tagger_end = tagger + strlen(tagger);
 413         } else {
 414                 tagger++;
 415                 tagger_end = strchrnul(tagger, '\n');
 416         }
 417
 418         /* handle signed tags */
 419         if (message) {
 420                 const char *signature = strstr(message,
 421                                                "\n-----BEGIN PGP SIGNATURE-----\n");
 422                 if (signature)
 423                         switch(signed_tag_mode) {
 424                         case ABORT:
 425                                 die ("Encountered signed tag %s; use "
 426                                      "--signed-tags=<mode> to handle it.",
 427                                      sha1_to_hex(tag->object.sha1));
 428                         case WARN:
 429                                 warning ("Exporting signed tag %s",
 430                                          sha1_to_hex(tag->object.sha1));
 431                                 /* fallthru */
 432                         case VERBATIM:
 433                                 break;
 434                         case WARN_STRIP:
 435                                 warning ("Stripping signature from tag %s",
 436                                          sha1_to_hex(tag->object.sha1));
 437                                 /* fallthru */
 438                         case STRIP:
 439                                 message_size = signature + 1 - message;
 440                                 break;
 441                         }
 442         }
 443
 444         /* handle tag->tagged having been filtered out due to paths specified */
 445         tagged = tag->tagged;
 446         tagged_mark = get_object_mark(tagged);
 447         if (!tagged_mark) {
 448                 switch(tag_of_filtered_mode) {
 449                 case ABORT:
 450                         die ("Tag %s tags unexported object; use "
 451                              "--tag-of-filtered-object=<mode> to handle it.",
 452                              sha1_to_hex(tag->object.sha1));
 453                 case DROP:
 454                         /* Ignore this tag altogether */
 455                         return;
 456                 case REWRITE:
 457                         if (tagged->type != OBJ_COMMIT) {
 458                                 die ("Tag %s tags unexported %s!",
 459                                      sha1_to_hex(tag->object.sha1),
 460                                      typename(tagged->type));
 461                         }
 462                         p = (struct commit *)tagged;
 463                         for (;;) {
 464                                 if (p->parents && p->parents->next)
 465                                         break;
 466                                 if (p->object.flags & UNINTERESTING)
 467                                         break;
 468                                 if (!(p->object.flags & TREESAME))
 469                                         break;
 470                                 if (!p->parents)
 471                                         die ("Can't find replacement commit for tag %s\n",
 472                                              sha1_to_hex(tag->object.sha1));
 473                                 p = p->parents->item;
 474                         }
 475                         tagged_mark = get_object_mark(&p->object);
 476                 }
 477         }
 478
 479         if (starts_with(name, "refs/tags/"))
 480                 name += 10;
 481         printf("tag %s\nfrom :%d\n%.*s%sdata %d\n%.*s\n",
 482                name, tagged_mark,
 483                (int)(tagger_end - tagger), tagger,
 484                tagger == tagger_end ? "" : "\n",
 485                (int)message_size, (int)message_size, message ? message : "");
 486 }
 487
 488 static struct commit *get_commit(struct rev_cmdline_entry *e, char *full_name)
 489 {
 490         switch (e->item->type) {
 491         case OBJ_COMMIT:
 492                 return (struct commit *)e->item;
 493         case OBJ_TAG: {
 494                 struct tag *tag = (struct tag *)e->item;
 495
 496                 /* handle nested tags */
 497                 while (tag && tag->object.type == OBJ_TAG) {
 498                         parse_object(tag->object.sha1);
 499                         string_list_append(&extra_refs, full_name)->util = tag;
 500                         tag = (struct tag *)tag->tagged;
 501                 }
 502                 if (!tag)
 503                         die("Tag %s points nowhere?", e->name);
 504                 return (struct commit *)tag;
 505                 break;
 506         }
 507         default:
 508                 return NULL;
 509         }
 510 }
 511
 512 static void get_tags_and_duplicates(struct rev_cmdline_info *info)
 513 {
 514         int i;
 515
 516         for (i = 0; i < info->nr; i++) {
 517                 struct rev_cmdline_entry *e = info->rev + i;
 518                 unsigned char sha1[20];
 519                 struct commit *commit;
 520                 char *full_name;
 521
 522                 if (e->flags & UNINTERESTING)
 523                         continue;
 524
 525                 if (dwim_ref(e->name, strlen(e->name), sha1, &full_name) != 1)
 526                         continue;
 527
 528                 commit = get_commit(e, full_name);
 529                 if (!commit) {
 530                         warning("%s: Unexpected object of type %s, skipping.",
 531                                 e->name,
 532                                 typename(e->item->type));
 533                         continue;
 534                 }
 535
 536                 switch(commit->object.type) {
 537                 case OBJ_COMMIT:
 538                         break;
 539                 case OBJ_BLOB:
 540                         export_blob(commit->object.sha1);
 541                         continue;
 542                 default: /* OBJ_TAG (nested tags) is already handled */
 543                         warning("Tag points to object of unexpected type %s, skipping.",
 544                                 typename(commit->object.type));
 545                         continue;
 546                 }
 547
 548                 /*
 549                  * This ref will not be updated through a commit, lets make
 550                  * sure it gets properly updated eventually.
 551                  */
 552                 if (commit->util || commit->object.flags & SHOWN)
 553                         string_list_append(&extra_refs, full_name)->util = commit;
 554                 if (!commit->util)
 555                         commit->util = full_name;
 556         }
 557 }
 558
 559 static void handle_tags_and_duplicates(void)
 560 {
 561         struct commit *commit;
 562         int i;
 563
 564         for (i = extra_refs.nr - 1; i >= 0; i--) {
 565                 const char *name = extra_refs.items[i].string;
 566                 struct object *object = extra_refs.items[i].util;
 567                 switch (object->type) {
 568                 case OBJ_TAG:
 569                         handle_tag(name, (struct tag *)object);
 570                         break;
 571                 case OBJ_COMMIT:
 572                         /* create refs pointing to already seen commits */
 573                         commit = (struct commit *)object;
 574                         printf("reset %s\nfrom :%d\n\n", name,
 575                                get_object_mark(&commit->object));
 576                         show_progress();
 577                         break;
 578                 }
 579         }
 580 }
 581
 582 static void export_marks(char *file)
 583 {
 584         unsigned int i;
 585         uint32_t mark;
 586         struct object_decoration *deco = idnums.hash;
 587         FILE *f;
 588         int e = 0;
 589
 590         f = fopen(file, "w");
 591         if (!f)
 592                 die_errno("Unable to open marks file %s for writing.", file);
 593
 594         for (i = 0; i < idnums.size; i++) {
 595                 if (deco->base && deco->base->type == 1) {
 596                         mark = ptr_to_mark(deco->decoration);
 597                         if (fprintf(f, ":%"PRIu32" %s\n", mark,
 598                                 sha1_to_hex(deco->base->sha1)) < 0) {
 599                             e = 1;
 600                             break;
 601                         }
 602                 }
 603                 deco++;
 604         }
 605
 606         e |= ferror(f);
 607         e |= fclose(f);
 608         if (e)
 609                 error("Unable to write marks file %s.", file);
 610 }
 611
 612 static void import_marks(char *input_file)
 613 {
 614         char line[512];
 615         FILE *f = fopen(input_file, "r");
 616         if (!f)
 617                 die_errno("cannot read '%s'", input_file);
 618
 619         while (fgets(line, sizeof(line), f)) {
 620                 uint32_t mark;
 621                 char *line_end, *mark_end;
 622                 unsigned char sha1[20];
 623                 struct object *object;
 624                 struct commit *commit;
 625                 enum object_type type;
 626
 627                 line_end = strchr(line, '\n');
 628                 if (line[0] != ':' || !line_end)
 629                         die("corrupt mark line: %s", line);
 630                 *line_end = '\0';
 631
 632                 mark = strtoumax(line + 1, &mark_end, 10);
 633                 if (!mark || mark_end == line + 1
 634                         || *mark_end != ' ' || get_sha1_hex(mark_end + 1, sha1))
 635                         die("corrupt mark line: %s", line);
 636
 637                 if (last_idnum < mark)
 638                         last_idnum = mark;
 639
 640                 type = sha1_object_info(sha1, NULL);
 641                 if (type < 0)
 642                         die("object not found: %s", sha1_to_hex(sha1));
 643
 644                 if (type != OBJ_COMMIT)
 645                         /* only commits */
 646                         continue;
 647
 648                 commit = lookup_commit(sha1);
 649                 if (!commit)
 650                         die("not a commit? can't happen: %s", sha1_to_hex(sha1));
 651
 652                 object = &commit->object;
 653
 654                 if (object->flags & SHOWN)
 655                         error("Object %s already has a mark", sha1_to_hex(sha1));
 656
 657                 mark_object(object, mark);
 658
 659                 object->flags |= SHOWN;
 660         }
 661         fclose(f);
 662 }
 663
 664 int cmd_fast_export(int argc, const char **argv, const char *prefix)
 665 {
 666         struct rev_info revs;
 667         struct object_array commits = OBJECT_ARRAY_INIT;
 668         struct commit *commit;
 669         char *export_filename = NULL, *import_filename = NULL;
 670         uint32_t lastimportid;
 671         struct option options[] = {
 672                 OPT_INTEGER(0, "progress", &progress,
 673                             N_("show progress after <n> objects")),
 674                 OPT_CALLBACK(0, "signed-tags", &signed_tag_mode, N_("mode"),
 675                              N_("select handling of signed tags"),
 676                              parse_opt_signed_tag_mode),
 677                 OPT_CALLBACK(0, "tag-of-filtered-object", &tag_of_filtered_mode, N_("mode"),
 678                              N_("select handling of tags that tag filtered objects"),
 679                              parse_opt_tag_of_filtered_mode),
 680                 OPT_STRING(0, "export-marks", &export_filename, N_("file"),
 681                              N_("Dump marks to this file")),
 682                 OPT_STRING(0, "import-marks", &import_filename, N_("file"),
 683                              N_("Import marks from this file")),
 684                 OPT_BOOL(0, "fake-missing-tagger", &fake_missing_tagger,
 685                          N_("Fake a tagger when tags lack one")),
 686                 OPT_BOOL(0, "full-tree", &full_tree,
 687                          N_("Output full tree for each commit")),
 688                 OPT_BOOL(0, "use-done-feature", &use_done_feature,
 689                              N_("Use the done feature to terminate the stream")),
 690                 OPT_BOOL(0, "no-data", &no_data, N_("Skip output of blob data")),
 691                 OPT_END()
 692         };
 693
 694         if (argc == 1)
 695                 usage_with_options (fast_export_usage, options);
 696
 697         /* we handle encodings */
 698         git_config(git_default_config, NULL);
 699
 700         init_revisions(&revs, prefix);
 701         revs.topo_order = 1;
 702         revs.show_source = 1;
 703         revs.rewrite_parents = 1;
 704         argc = setup_revisions(argc, argv, &revs, NULL);
 705         argc = parse_options(argc, argv, prefix, options, fast_export_usage, 0);
 706         if (argc > 1)
 707                 usage_with_options (fast_export_usage, options);
 708
 709         if (use_done_feature)
 710                 printf("feature done\n");
 711
 712         if (import_filename)
 713                 import_marks(import_filename);
 714         lastimportid = last_idnum;
 715
 716         if (import_filename && revs.prune_data.nr)
 717                 full_tree = 1;
 718
 719         get_tags_and_duplicates(&revs.cmdline);
 720
 721         if (prepare_revision_walk(&revs))
 722                 die("revision walk setup failed");
 723         revs.diffopt.format_callback = show_filemodify;
 724         DIFF_OPT_SET(&revs.diffopt, RECURSIVE);
 725         while ((commit = get_revision(&revs))) {
 726                 if (has_unshown_parent(commit)) {
 727                         add_object_array(&commit->object, NULL, &commits);
 728                 }
 729                 else {
 730                         handle_commit(commit, &revs);
 731                         handle_tail(&commits, &revs);
 732                 }
 733         }
 734
 735         handle_tags_and_duplicates();
 736
 737         if (export_filename && lastimportid != last_idnum)
 738                 export_marks(export_filename);
 739
 740         if (use_done_feature)
 741                 printf("done\n");
 742
 743         return 0;
 744 }