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         "git fast-export [rev-list-opts]",
  23         NULL
  24 };
  25
  26 static int progress;
  27 static enum { ABORT, VERBATIM, WARN, STRIP } signed_tag_mode = ABORT;
  28 static enum { ERROR, DROP, REWRITE } tag_of_filtered_mode = ABORT;
  29 static int fake_missing_tagger;
  30 static int no_data;
  31 static int full_tree;
  32
  33 static int parse_opt_signed_tag_mode(const struct option *opt,
  34                                      const char *arg, int unset)
  35 {
  36         if (unset || !strcmp(arg, "abort"))
  37                 signed_tag_mode = ABORT;
  38         else if (!strcmp(arg, "verbatim") || !strcmp(arg, "ignore"))
  39                 signed_tag_mode = VERBATIM;
  40         else if (!strcmp(arg, "warn"))
  41                 signed_tag_mode = WARN;
  42         else if (!strcmp(arg, "strip"))
  43                 signed_tag_mode = STRIP;
  44         else
  45                 return error("Unknown signed-tag mode: %s", arg);
  46         return 0;
  47 }
  48
  49 static int parse_opt_tag_of_filtered_mode(const struct option *opt,
  50                                           const char *arg, int unset)
  51 {
  52         if (unset || !strcmp(arg, "abort"))
  53                 tag_of_filtered_mode = ABORT;
  54         else if (!strcmp(arg, "drop"))
  55                 tag_of_filtered_mode = DROP;
  56         else if (!strcmp(arg, "rewrite"))
  57                 tag_of_filtered_mode = REWRITE;
  58         else
  59                 return error("Unknown tag-of-filtered mode: %s", arg);
  60         return 0;
  61 }
  62
  63 static struct decoration idnums;
  64 static uint32_t last_idnum;
  65
  66 static int has_unshown_parent(struct commit *commit)
  67 {
  68         struct commit_list *parent;
  69
  70         for (parent = commit->parents; parent; parent = parent->next)
  71                 if (!(parent->item->object.flags & SHOWN) &&
  72                     !(parent->item->object.flags & UNINTERESTING))
  73                         return 1;
  74         return 0;
  75 }
  76
  77 /* Since intptr_t is C99, we do not use it here */
  78 static inline uint32_t *mark_to_ptr(uint32_t mark)
  79 {
  80         return ((uint32_t *)NULL) + mark;
  81 }
  82
  83 static inline uint32_t ptr_to_mark(void * mark)
  84 {
  85         return (uint32_t *)mark - (uint32_t *)NULL;
  86 }
  87
  88 static inline void mark_object(struct object *object, uint32_t mark)
  89 {
  90         add_decoration(&idnums, object, mark_to_ptr(mark));
  91 }
  92
  93 static inline void mark_next_object(struct object *object)
  94 {
  95         mark_object(object, ++last_idnum);
  96 }
  97
  98 static int get_object_mark(struct object *object)
  99 {
 100         void *decoration = lookup_decoration(&idnums, object);
 101         if (!decoration)
 102                 return 0;
 103         return ptr_to_mark(decoration);
 104 }
 105
 106 static void show_progress(void)
 107 {
 108         static int counter = 0;
 109         if (!progress)
 110                 return;
 111         if ((++counter % progress) == 0)
 112                 printf("progress %d objects\n", counter);
 113 }
 114
 115 static void handle_object(const unsigned char *sha1)
 116 {
 117         unsigned long size;
 118         enum object_type type;
 119         char *buf;
 120         struct object *object;
 121
 122         if (no_data)
 123                 return;
 124
 125         if (is_null_sha1(sha1))
 126                 return;
 127
 128         object = parse_object(sha1);
 129         if (!object)
 130                 die ("Could not read blob %s", sha1_to_hex(sha1));
 131
 132         if (object->flags & SHOWN)
 133                 return;
 134
 135         buf = read_sha1_file(sha1, &type, &size);
 136         if (!buf)
 137                 die ("Could not read blob %s", sha1_to_hex(sha1));
 138
 139         mark_next_object(object);
 140
 141         printf("blob\nmark :%"PRIu32"\ndata %lu\n", last_idnum, size);
 142         if (size && fwrite(buf, size, 1, stdout) != 1)
 143                 die_errno ("Could not write blob '%s'", sha1_to_hex(sha1));
 144         printf("\n");
 145
 146         show_progress();
 147
 148         object->flags |= SHOWN;
 149         free(buf);
 150 }
 151
 152 static int depth_first(const void *a_, const void *b_)
 153 {
 154         const struct diff_filepair *a = *((const struct diff_filepair **)a_);
 155         const struct diff_filepair *b = *((const struct diff_filepair **)b_);
 156         const char *name_a, *name_b;
 157         int len_a, len_b, len;
 158         int cmp;
 159
 160         name_a = a->one ? a->one->path : a->two->path;
 161         name_b = b->one ? b->one->path : b->two->path;
 162
 163         len_a = strlen(name_a);
 164         len_b = strlen(name_b);
 165         len = (len_a < len_b) ? len_a : len_b;
 166
 167         /* strcmp will sort 'd' before 'd/e', we want 'd/e' before 'd' */
 168         cmp = memcmp(name_a, name_b, len);
 169         if (cmp)
 170                 return cmp;
 171         cmp = len_b - len_a;
 172         if (cmp)
 173                 return cmp;
 174         /*
 175          * Move 'R'ename entries last so that all references of the file
 176          * appear in the output before it is renamed (e.g., when a file
 177          * was copied and renamed in the same commit).
 178          */
 179         return (a->status == 'R') - (b->status == 'R');
 180 }
 181
 182 static void print_path(const char *path)
 183 {
 184         int need_quote = quote_c_style(path, NULL, NULL, 0);
 185         if (need_quote)
 186                 quote_c_style(path, NULL, stdout, 0);
 187         else
 188                 printf("%s", path);
 189 }
 190
 191 static void show_filemodify(struct diff_queue_struct *q,
 192                             struct diff_options *options, void *data)
 193 {
 194         int i;
 195
 196         /*
 197          * Handle files below a directory first, in case they are all deleted
 198          * and the directory changes to a file or symlink.
 199          */
 200         qsort(q->queue, q->nr, sizeof(q->queue[0]), depth_first);
 201
 202         for (i = 0; i < q->nr; i++) {
 203                 struct diff_filespec *ospec = q->queue[i]->one;
 204                 struct diff_filespec *spec = q->queue[i]->two;
 205
 206                 switch (q->queue[i]->status) {
 207                 case DIFF_STATUS_DELETED:
 208                         printf("D ");
 209                         print_path(spec->path);
 210                         putchar('\n');
 211                         break;
 212
 213                 case DIFF_STATUS_COPIED:
 214                 case DIFF_STATUS_RENAMED:
 215                         printf("%c ", q->queue[i]->status);
 216                         print_path(ospec->path);
 217                         putchar(' ');
 218                         print_path(spec->path);
 219                         putchar('\n');
 220
 221                         if (!hashcmp(ospec->sha1, spec->sha1) &&
 222                             ospec->mode == spec->mode)
 223                                 break;
 224                         /* fallthrough */
 225
 226                 case DIFF_STATUS_TYPE_CHANGED:
 227                 case DIFF_STATUS_MODIFIED:
 228                 case DIFF_STATUS_ADDED:
 229                         /*
 230                          * Links refer to objects in another repositories;
 231                          * output the SHA-1 verbatim.
 232                          */
 233                         if (no_data || S_ISGITLINK(spec->mode))
 234                                 printf("M %06o %s ", spec->mode,
 235                                        sha1_to_hex(spec->sha1));
 236                         else {
 237                                 struct object *object = lookup_object(spec->sha1);
 238                                 printf("M %06o :%d ", spec->mode,
 239                                        get_object_mark(object));
 240                         }
 241                         print_path(spec->path);
 242                         putchar('\n');
 243                         break;
 244
 245                 default:
 246                         die("Unexpected comparison status '%c' for %s, %s",
 247                                 q->queue[i]->status,
 248                                 ospec->path ? ospec->path : "none",
 249                                 spec->path ? spec->path : "none");
 250                 }
 251         }
 252 }
 253
 254 static const char *find_encoding(const char *begin, const char *end)
 255 {
 256         const char *needle = "\nencoding ";
 257         char *bol, *eol;
 258
 259         bol = memmem(begin, end ? end - begin : strlen(begin),
 260                      needle, strlen(needle));
 261         if (!bol)
 262                 return git_commit_encoding;
 263         bol += strlen(needle);
 264         eol = strchrnul(bol, '\n');
 265         *eol = '\0';
 266         return bol;
 267 }
 268
 269 static void handle_commit(struct commit *commit, struct rev_info *rev)
 270 {
 271         int saved_output_format = rev->diffopt.output_format;
 272         const char *author, *author_end, *committer, *committer_end;
 273         const char *encoding, *message;
 274         char *reencoded = NULL;
 275         struct commit_list *p;
 276         int i;
 277
 278         rev->diffopt.output_format = DIFF_FORMAT_CALLBACK;
 279
 280         parse_commit(commit);
 281         author = strstr(commit->buffer, "\nauthor ");
 282         if (!author)
 283                 die ("Could not find author in commit %s",
 284                      sha1_to_hex(commit->object.sha1));
 285         author++;
 286         author_end = strchrnul(author, '\n');
 287         committer = strstr(author_end, "\ncommitter ");
 288         if (!committer)
 289                 die ("Could not find committer in commit %s",
 290                      sha1_to_hex(commit->object.sha1));
 291         committer++;
 292         committer_end = strchrnul(committer, '\n');
 293         message = strstr(committer_end, "\n\n");
 294         encoding = find_encoding(committer_end, message);
 295         if (message)
 296                 message += 2;
 297
 298         if (commit->parents &&
 299             get_object_mark(&commit->parents->item->object) != 0 &&
 300             !full_tree) {
 301                 parse_commit(commit->parents->item);
 302                 diff_tree_sha1(commit->parents->item->tree->object.sha1,
 303                                commit->tree->object.sha1, "", &rev->diffopt);
 304         }
 305         else
 306                 diff_root_tree_sha1(commit->tree->object.sha1,
 307                                     "", &rev->diffopt);
 308
 309         /* Export the referenced blobs, and remember the marks. */
 310         for (i = 0; i < diff_queued_diff.nr; i++)
 311                 if (!S_ISGITLINK(diff_queued_diff.queue[i]->two->mode))
 312                         handle_object(diff_queued_diff.queue[i]->two->sha1);
 313
 314         mark_next_object(&commit->object);
 315         if (!is_encoding_utf8(encoding))
 316                 reencoded = reencode_string(message, "UTF-8", encoding);
 317         if (!commit->parents)
 318                 printf("reset %s\n", (const char*)commit->util);
 319         printf("commit %s\nmark :%"PRIu32"\n%.*s\n%.*s\ndata %u\n%s",
 320                (const char *)commit->util, last_idnum,
 321                (int)(author_end - author), author,
 322                (int)(committer_end - committer), committer,
 323                (unsigned)(reencoded
 324                           ? strlen(reencoded) : message
 325                           ? strlen(message) : 0),
 326                reencoded ? reencoded : message ? message : "");
 327         free(reencoded);
 328
 329         for (i = 0, p = commit->parents; p; p = p->next) {
 330                 int mark = get_object_mark(&p->item->object);
 331                 if (!mark)
 332                         continue;
 333                 if (i == 0)
 334                         printf("from :%d\n", mark);
 335                 else
 336                         printf("merge :%d\n", mark);
 337                 i++;
 338         }
 339
 340         if (full_tree)
 341                 printf("deleteall\n");
 342         log_tree_diff_flush(rev);
 343         rev->diffopt.output_format = saved_output_format;
 344
 345         printf("\n");
 346
 347         show_progress();
 348 }
 349
 350 static void handle_tail(struct object_array *commits, struct rev_info *revs)
 351 {
 352         struct commit *commit;
 353         while (commits->nr) {
 354                 commit = (struct commit *)commits->objects[commits->nr - 1].item;
 355                 if (has_unshown_parent(commit))
 356                         return;
 357                 handle_commit(commit, revs);
 358                 commits->nr--;
 359         }
 360 }
 361
 362 static void handle_tag(const char *name, struct tag *tag)
 363 {
 364         unsigned long size;
 365         enum object_type type;
 366         char *buf;
 367         const char *tagger, *tagger_end, *message;
 368         size_t message_size = 0;
 369         struct object *tagged;
 370         int tagged_mark;
 371         struct commit *p;
 372
 373         /* Trees have no identifer in fast-export output, thus we have no way
 374          * to output tags of trees, tags of tags of trees, etc.  Simply omit
 375          * such tags.
 376          */
 377         tagged = tag->tagged;
 378         while (tagged->type == OBJ_TAG) {
 379                 tagged = ((struct tag *)tagged)->tagged;
 380         }
 381         if (tagged->type == OBJ_TREE) {
 382                 warning("Omitting tag %s,\nsince tags of trees (or tags of tags of trees, etc.) are not supported.",
 383                         sha1_to_hex(tag->object.sha1));
 384                 return;
 385         }
 386
 387         buf = read_sha1_file(tag->object.sha1, &type, &size);
 388         if (!buf)
 389                 die ("Could not read tag %s", sha1_to_hex(tag->object.sha1));
 390         message = memmem(buf, size, "\n\n", 2);
 391         if (message) {
 392                 message += 2;
 393                 message_size = strlen(message);
 394         }
 395         tagger = memmem(buf, message ? message - buf : size, "\ntagger ", 8);
 396         if (!tagger) {
 397                 if (fake_missing_tagger)
 398                         tagger = "tagger Unspecified Tagger "
 399                                 "<unspecified-tagger> 0 +0000";
 400                 else
 401                         tagger = "";
 402                 tagger_end = tagger + strlen(tagger);
 403         } else {
 404                 tagger++;
 405                 tagger_end = strchrnul(tagger, '\n');
 406         }
 407
 408         /* handle signed tags */
 409         if (message) {
 410                 const char *signature = strstr(message,
 411                                                "\n-----BEGIN PGP SIGNATURE-----\n");
 412                 if (signature)
 413                         switch(signed_tag_mode) {
 414                         case ABORT:
 415                                 die ("Encountered signed tag %s; use "
 416                                      "--signed-tag=<mode> to handle it.",
 417                                      sha1_to_hex(tag->object.sha1));
 418                         case WARN:
 419                                 warning ("Exporting signed tag %s",
 420                                          sha1_to_hex(tag->object.sha1));
 421                                 /* fallthru */
 422                         case VERBATIM:
 423                                 break;
 424                         case STRIP:
 425                                 message_size = signature + 1 - message;
 426                                 break;
 427                         }
 428         }
 429
 430         /* handle tag->tagged having been filtered out due to paths specified */
 431         tagged = tag->tagged;
 432         tagged_mark = get_object_mark(tagged);
 433         if (!tagged_mark) {
 434                 switch(tag_of_filtered_mode) {
 435                 case ABORT:
 436                         die ("Tag %s tags unexported object; use "
 437                              "--tag-of-filtered-object=<mode> to handle it.",
 438                              sha1_to_hex(tag->object.sha1));
 439                 case DROP:
 440                         /* Ignore this tag altogether */
 441                         return;
 442                 case REWRITE:
 443                         if (tagged->type != OBJ_COMMIT) {
 444                                 die ("Tag %s tags unexported %s!",
 445                                      sha1_to_hex(tag->object.sha1),
 446                                      typename(tagged->type));
 447                         }
 448                         p = (struct commit *)tagged;
 449                         for (;;) {
 450                                 if (p->parents && p->parents->next)
 451                                         break;
 452                                 if (p->object.flags & UNINTERESTING)
 453                                         break;
 454                                 if (!(p->object.flags & TREESAME))
 455                                         break;
 456                                 if (!p->parents)
 457                                         die ("Can't find replacement commit for tag %s\n",
 458                                              sha1_to_hex(tag->object.sha1));
 459                                 p = p->parents->item;
 460                         }
 461                         tagged_mark = get_object_mark(&p->object);
 462                 }
 463         }
 464
 465         if (!prefixcmp(name, "refs/tags/"))
 466                 name += 10;
 467         printf("tag %s\nfrom :%d\n%.*s%sdata %d\n%.*s\n",
 468                name, tagged_mark,
 469                (int)(tagger_end - tagger), tagger,
 470                tagger == tagger_end ? "" : "\n",
 471                (int)message_size, (int)message_size, message ? message : "");
 472 }
 473
 474 static void get_tags_and_duplicates(struct object_array *pending,
 475                                     struct string_list *extra_refs)
 476 {
 477         struct tag *tag;
 478         int i;
 479
 480         for (i = 0; i < pending->nr; i++) {
 481                 struct object_array_entry *e = pending->objects + i;
 482                 unsigned char sha1[20];
 483                 struct commit *commit = commit;
 484                 char *full_name;
 485
 486                 if (dwim_ref(e->name, strlen(e->name), sha1, &full_name) != 1)
 487                         continue;
 488
 489                 switch (e->item->type) {
 490                 case OBJ_COMMIT:
 491                         commit = (struct commit *)e->item;
 492                         break;
 493                 case OBJ_TAG:
 494                         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                         switch(tag->object.type) {
 505                         case OBJ_COMMIT:
 506                                 commit = (struct commit *)tag;
 507                                 break;
 508                         case OBJ_BLOB:
 509                                 handle_object(tag->object.sha1);
 510                                 continue;
 511                         default: /* OBJ_TAG (nested tags) is already handled */
 512                                 warning("Tag points to object of unexpected type %s, skipping.",
 513                                         typename(tag->object.type));
 514                                 continue;
 515                         }
 516                         break;
 517                 default:
 518                         warning("%s: Unexpected object of type %s, skipping.",
 519                                 e->name,
 520                                 typename(e->item->type));
 521                         continue;
 522                 }
 523                 if (commit->util)
 524                         /* more than one name for the same object */
 525                         string_list_append(extra_refs, full_name)->util = commit;
 526                 else
 527                         commit->util = full_name;
 528         }
 529 }
 530
 531 static void handle_tags_and_duplicates(struct string_list *extra_refs)
 532 {
 533         struct commit *commit;
 534         int i;
 535
 536         for (i = extra_refs->nr - 1; i >= 0; i--) {
 537                 const char *name = extra_refs->items[i].string;
 538                 struct object *object = extra_refs->items[i].util;
 539                 switch (object->type) {
 540                 case OBJ_TAG:
 541                         handle_tag(name, (struct tag *)object);
 542                         break;
 543                 case OBJ_COMMIT:
 544                         /* create refs pointing to already seen commits */
 545                         commit = (struct commit *)object;
 546                         printf("reset %s\nfrom :%d\n\n", name,
 547                                get_object_mark(&commit->object));
 548                         show_progress();
 549                         break;
 550                 }
 551         }
 552 }
 553
 554 static void export_marks(char *file)
 555 {
 556         unsigned int i;
 557         uint32_t mark;
 558         struct object_decoration *deco = idnums.hash;
 559         FILE *f;
 560         int e = 0;
 561
 562         f = fopen(file, "w");
 563         if (!f)
 564                 die_errno("Unable to open marks file %s for writing.", file);
 565
 566         for (i = 0; i < idnums.size; i++) {
 567                 if (deco->base && deco->base->type == 1) {
 568                         mark = ptr_to_mark(deco->decoration);
 569                         if (fprintf(f, ":%"PRIu32" %s\n", mark,
 570                                 sha1_to_hex(deco->base->sha1)) < 0) {
 571                             e = 1;
 572                             break;
 573                         }
 574                 }
 575                 deco++;
 576         }
 577
 578         e |= ferror(f);
 579         e |= fclose(f);
 580         if (e)
 581                 error("Unable to write marks file %s.", file);
 582 }
 583
 584 static void import_marks(char *input_file)
 585 {
 586         char line[512];
 587         FILE *f = fopen(input_file, "r");
 588         if (!f)
 589                 die_errno("cannot read '%s'", input_file);
 590
 591         while (fgets(line, sizeof(line), f)) {
 592                 uint32_t mark;
 593                 char *line_end, *mark_end;
 594                 unsigned char sha1[20];
 595                 struct object *object;
 596
 597                 line_end = strchr(line, '\n');
 598                 if (line[0] != ':' || !line_end)
 599                         die("corrupt mark line: %s", line);
 600                 *line_end = '\0';
 601
 602                 mark = strtoumax(line + 1, &mark_end, 10);
 603                 if (!mark || mark_end == line + 1
 604                         || *mark_end != ' ' || get_sha1(mark_end + 1, sha1))
 605                         die("corrupt mark line: %s", line);
 606
 607                 object = parse_object(sha1);
 608                 if (!object)
 609                         die ("Could not read blob %s", sha1_to_hex(sha1));
 610
 611                 if (object->flags & SHOWN)
 612                         error("Object %s already has a mark", sha1);
 613
 614                 mark_object(object, mark);
 615                 if (last_idnum < mark)
 616                         last_idnum = mark;
 617
 618                 object->flags |= SHOWN;
 619         }
 620         fclose(f);
 621 }
 622
 623 int cmd_fast_export(int argc, const char **argv, const char *prefix)
 624 {
 625         struct rev_info revs;
 626         struct object_array commits = OBJECT_ARRAY_INIT;
 627         struct string_list extra_refs = STRING_LIST_INIT_NODUP;
 628         struct commit *commit;
 629         char *export_filename = NULL, *import_filename = NULL;
 630         struct option options[] = {
 631                 OPT_INTEGER(0, "progress", &progress,
 632                             "show progress after <n> objects"),
 633                 OPT_CALLBACK(0, "signed-tags", &signed_tag_mode, "mode",
 634                              "select handling of signed tags",
 635                              parse_opt_signed_tag_mode),
 636                 OPT_CALLBACK(0, "tag-of-filtered-object", &tag_of_filtered_mode, "mode",
 637                              "select handling of tags that tag filtered objects",
 638                              parse_opt_tag_of_filtered_mode),
 639                 OPT_STRING(0, "export-marks", &export_filename, "file",
 640                              "Dump marks to this file"),
 641                 OPT_STRING(0, "import-marks", &import_filename, "file",
 642                              "Import marks from this file"),
 643                 OPT_BOOLEAN(0, "fake-missing-tagger", &fake_missing_tagger,
 644                              "Fake a tagger when tags lack one"),
 645                 OPT_BOOLEAN(0, "full-tree", &full_tree,
 646                              "Output full tree for each commit"),
 647                 { OPTION_NEGBIT, 0, "data", &no_data, NULL,
 648                         "Skip output of blob data",
 649                         PARSE_OPT_NOARG | PARSE_OPT_NEGHELP, NULL, 1 },
 650                 OPT_END()
 651         };
 652
 653         if (argc == 1)
 654                 usage_with_options (fast_export_usage, options);
 655
 656         /* we handle encodings */
 657         git_config(git_default_config, NULL);
 658
 659         init_revisions(&revs, prefix);
 660         revs.topo_order = 1;
 661         revs.show_source = 1;
 662         revs.rewrite_parents = 1;
 663         argc = setup_revisions(argc, argv, &revs, NULL);
 664         argc = parse_options(argc, argv, prefix, options, fast_export_usage, 0);
 665         if (argc > 1)
 666                 usage_with_options (fast_export_usage, options);
 667
 668         if (import_filename)
 669                 import_marks(import_filename);
 670
 671         if (import_filename && revs.prune_data.nr)
 672                 full_tree = 1;
 673
 674         get_tags_and_duplicates(&revs.pending, &extra_refs);
 675
 676         if (prepare_revision_walk(&revs))
 677                 die("revision walk setup failed");
 678         revs.diffopt.format_callback = show_filemodify;
 679         DIFF_OPT_SET(&revs.diffopt, RECURSIVE);
 680         while ((commit = get_revision(&revs))) {
 681                 if (has_unshown_parent(commit)) {
 682                         add_object_array(&commit->object, NULL, &commits);
 683                 }
 684                 else {
 685                         handle_commit(commit, &revs);
 686                         handle_tail(&commits, &revs);
 687                 }
 688         }
 689
 690         handle_tags_and_duplicates(&extra_refs);
 691
 692         if (export_filename)
 693                 export_marks(export_filename);
 694
 695         return 0;
 696 }