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, 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
  34 static int parse_opt_signed_tag_mode(const struct option *opt,
  35                                      const char *arg, int unset)
  36 {
  37         if (unset || !strcmp(arg, "abort"))
  38                 signed_tag_mode = ABORT;
  39         else if (!strcmp(arg, "verbatim") || !strcmp(arg, "ignore"))
  40                 signed_tag_mode = VERBATIM;
  41         else if (!strcmp(arg, "warn"))
  42                 signed_tag_mode = WARN;
  43         else if (!strcmp(arg, "strip"))
  44                 signed_tag_mode = STRIP;
  45         else
  46                 return error("Unknown signed-tag mode: %s", arg);
  47         return 0;
  48 }
  49
  50 static int parse_opt_tag_of_filtered_mode(const struct option *opt,
  51                                           const char *arg, int unset)
  52 {
  53         if (unset || !strcmp(arg, "abort"))
  54                 tag_of_filtered_mode = ERROR;
  55         else if (!strcmp(arg, "drop"))
  56                 tag_of_filtered_mode = DROP;
  57         else if (!strcmp(arg, "rewrite"))
  58                 tag_of_filtered_mode = REWRITE;
  59         else
  60                 return error("Unknown tag-of-filtered mode: %s", arg);
  61         return 0;
  62 }
  63
  64 static struct decoration idnums;
  65 static uint32_t last_idnum;
  66
  67 static int has_unshown_parent(struct commit *commit)
  68 {
  69         struct commit_list *parent;
  70
  71         for (parent = commit->parents; parent; parent = parent->next)
  72                 if (!(parent->item->object.flags & SHOWN) &&
  73                     !(parent->item->object.flags & UNINTERESTING))
  74                         return 1;
  75         return 0;
  76 }
  77
  78 /* Since intptr_t is C99, we do not use it here */
  79 static inline uint32_t *mark_to_ptr(uint32_t mark)
  80 {
  81         return ((uint32_t *)NULL) + mark;
  82 }
  83
  84 static inline uint32_t ptr_to_mark(void * mark)
  85 {
  86         return (uint32_t *)mark - (uint32_t *)NULL;
  87 }
  88
  89 static inline void mark_object(struct object *object, uint32_t mark)
  90 {
  91         add_decoration(&idnums, object, mark_to_ptr(mark));
  92 }
  93
  94 static inline void mark_next_object(struct object *object)
  95 {
  96         mark_object(object, ++last_idnum);
  97 }
  98
  99 static int get_object_mark(struct object *object)
 100 {
 101         void *decoration = lookup_decoration(&idnums, object);
 102         if (!decoration)
 103                 return 0;
 104         return ptr_to_mark(decoration);
 105 }
 106
 107 static void show_progress(void)
 108 {
 109         static int counter = 0;
 110         if (!progress)
 111                 return;
 112         if ((++counter % progress) == 0)
 113                 printf("progress %d objects\n", counter);
 114 }
 115
 116 static void handle_object(const unsigned char *sha1)
 117 {
 118         unsigned long size;
 119         enum object_type type;
 120         char *buf;
 121         struct object *object;
 122
 123         if (no_data)
 124                 return;
 125
 126         if (is_null_sha1(sha1))
 127                 return;
 128
 129         object = parse_object(sha1);
 130         if (!object)
 131                 die ("Could not read blob %s", sha1_to_hex(sha1));
 132
 133         if (object->flags & SHOWN)
 134                 return;
 135
 136         buf = read_sha1_file(sha1, &type, &size);
 137         if (!buf)
 138                 die ("Could not read blob %s", sha1_to_hex(sha1));
 139
 140         mark_next_object(object);
 141
 142         printf("blob\nmark :%"PRIu32"\ndata %lu\n", last_idnum, size);
 143         if (size && fwrite(buf, size, 1, stdout) != 1)
 144                 die_errno ("Could not write blob '%s'", sha1_to_hex(sha1));
 145         printf("\n");
 146
 147         show_progress();
 148
 149         object->flags |= SHOWN;
 150         free(buf);
 151 }
 152
 153 static int depth_first(const void *a_, const void *b_)
 154 {
 155         const struct diff_filepair *a = *((const struct diff_filepair **)a_);
 156         const struct diff_filepair *b = *((const struct diff_filepair **)b_);
 157         const char *name_a, *name_b;
 158         int len_a, len_b, len;
 159         int cmp;
 160
 161         name_a = a->one ? a->one->path : a->two->path;
 162         name_b = b->one ? b->one->path : b->two->path;
 163
 164         len_a = strlen(name_a);
 165         len_b = strlen(name_b);
 166         len = (len_a < len_b) ? len_a : len_b;
 167
 168         /* strcmp will sort 'd' before 'd/e', we want 'd/e' before 'd' */
 169         cmp = memcmp(name_a, name_b, len);
 170         if (cmp)
 171                 return cmp;
 172         cmp = len_b - len_a;
 173         if (cmp)
 174                 return cmp;
 175         /*
 176          * Move 'R'ename entries last so that all references of the file
 177          * appear in the output before it is renamed (e.g., when a file
 178          * was copied and renamed in the same commit).
 179          */
 180         return (a->status == 'R') - (b->status == 'R');
 181 }
 182
 183 static void print_path(const char *path)
 184 {
 185         int need_quote = quote_c_style(path, NULL, NULL, 0);
 186         if (need_quote)
 187                 quote_c_style(path, NULL, stdout, 0);
 188         else if (strchr(path, ' '))
 189                 printf("\"%s\"", path);
 190         else
 191                 printf("%s", path);
 192 }
 193
 194 static void show_filemodify(struct diff_queue_struct *q,
 195                             struct diff_options *options, void *data)
 196 {
 197         int i;
 198
 199         /*
 200          * Handle files below a directory first, in case they are all deleted
 201          * and the directory changes to a file or symlink.
 202          */
 203         qsort(q->queue, q->nr, sizeof(q->queue[0]), depth_first);
 204
 205         for (i = 0; i < q->nr; i++) {
 206                 struct diff_filespec *ospec = q->queue[i]->one;
 207                 struct diff_filespec *spec = q->queue[i]->two;
 208
 209                 switch (q->queue[i]->status) {
 210                 case DIFF_STATUS_DELETED:
 211                         printf("D ");
 212                         print_path(spec->path);
 213                         putchar('\n');
 214                         break;
 215
 216                 case DIFF_STATUS_COPIED:
 217                 case DIFF_STATUS_RENAMED:
 218                         printf("%c ", q->queue[i]->status);
 219                         print_path(ospec->path);
 220                         putchar(' ');
 221                         print_path(spec->path);
 222                         putchar('\n');
 223
 224                         if (!hashcmp(ospec->sha1, spec->sha1) &&
 225                             ospec->mode == spec->mode)
 226                                 break;
 227                         /* fallthrough */
 228
 229                 case DIFF_STATUS_TYPE_CHANGED:
 230                 case DIFF_STATUS_MODIFIED:
 231                 case DIFF_STATUS_ADDED:
 232                         /*
 233                          * Links refer to objects in another repositories;
 234                          * output the SHA-1 verbatim.
 235                          */
 236                         if (no_data || S_ISGITLINK(spec->mode))
 237                                 printf("M %06o %s ", spec->mode,
 238                                        sha1_to_hex(spec->sha1));
 239                         else {
 240                                 struct object *object = lookup_object(spec->sha1);
 241                                 printf("M %06o :%d ", spec->mode,
 242                                        get_object_mark(object));
 243                         }
 244                         print_path(spec->path);
 245                         putchar('\n');
 246                         break;
 247
 248                 default:
 249                         die("Unexpected comparison status '%c' for %s, %s",
 250                                 q->queue[i]->status,
 251                                 ospec->path ? ospec->path : "none",
 252                                 spec->path ? spec->path : "none");
 253                 }
 254         }
 255 }
 256
 257 static const char *find_encoding(const char *begin, const char *end)
 258 {
 259         const char *needle = "\nencoding ";
 260         char *bol, *eol;
 261
 262         bol = memmem(begin, end ? end - begin : strlen(begin),
 263                      needle, strlen(needle));
 264         if (!bol)
 265                 return git_commit_encoding;
 266         bol += strlen(needle);
 267         eol = strchrnul(bol, '\n');
 268         *eol = '\0';
 269         return bol;
 270 }
 271
 272 static void handle_commit(struct commit *commit, struct rev_info *rev)
 273 {
 274         int saved_output_format = rev->diffopt.output_format;
 275         const char *author, *author_end, *committer, *committer_end;
 276         const char *encoding, *message;
 277         char *reencoded = NULL;
 278         struct commit_list *p;
 279         int i;
 280
 281         rev->diffopt.output_format = DIFF_FORMAT_CALLBACK;
 282
 283         parse_commit(commit);
 284         author = strstr(commit->buffer, "\nauthor ");
 285         if (!author)
 286                 die ("Could not find author in commit %s",
 287                      sha1_to_hex(commit->object.sha1));
 288         author++;
 289         author_end = strchrnul(author, '\n');
 290         committer = strstr(author_end, "\ncommitter ");
 291         if (!committer)
 292                 die ("Could not find committer in commit %s",
 293                      sha1_to_hex(commit->object.sha1));
 294         committer++;
 295         committer_end = strchrnul(committer, '\n');
 296         message = strstr(committer_end, "\n\n");
 297         encoding = find_encoding(committer_end, message);
 298         if (message)
 299                 message += 2;
 300
 301         if (commit->parents &&
 302             get_object_mark(&commit->parents->item->object) != 0 &&
 303             !full_tree) {
 304                 parse_commit(commit->parents->item);
 305                 diff_tree_sha1(commit->parents->item->tree->object.sha1,
 306                                commit->tree->object.sha1, "", &rev->diffopt);
 307         }
 308         else
 309                 diff_root_tree_sha1(commit->tree->object.sha1,
 310                                     "", &rev->diffopt);
 311
 312         /* Export the referenced blobs, and remember the marks. */
 313         for (i = 0; i < diff_queued_diff.nr; i++)
 314                 if (!S_ISGITLINK(diff_queued_diff.queue[i]->two->mode))
 315                         handle_object(diff_queued_diff.queue[i]->two->sha1);
 316
 317         mark_next_object(&commit->object);
 318         if (!is_encoding_utf8(encoding))
 319                 reencoded = reencode_string(message, "UTF-8", encoding);
 320         if (!commit->parents)
 321                 printf("reset %s\n", (const char*)commit->util);
 322         printf("commit %s\nmark :%"PRIu32"\n%.*s\n%.*s\ndata %u\n%s",
 323                (const char *)commit->util, last_idnum,
 324                (int)(author_end - author), author,
 325                (int)(committer_end - committer), committer,
 326                (unsigned)(reencoded
 327                           ? strlen(reencoded) : message
 328                           ? strlen(message) : 0),
 329                reencoded ? reencoded : message ? message : "");
 330         free(reencoded);
 331
 332         for (i = 0, p = commit->parents; p; p = p->next) {
 333                 int mark = get_object_mark(&p->item->object);
 334                 if (!mark)
 335                         continue;
 336                 if (i == 0)
 337                         printf("from :%d\n", mark);
 338                 else
 339                         printf("merge :%d\n", mark);
 340                 i++;
 341         }
 342
 343         if (full_tree)
 344                 printf("deleteall\n");
 345         log_tree_diff_flush(rev);
 346         rev->diffopt.output_format = saved_output_format;
 347
 348         printf("\n");
 349
 350         show_progress();
 351 }
 352
 353 static void handle_tail(struct object_array *commits, struct rev_info *revs)
 354 {
 355         struct commit *commit;
 356         while (commits->nr) {
 357                 commit = (struct commit *)commits->objects[commits->nr - 1].item;
 358                 if (has_unshown_parent(commit))
 359                         return;
 360                 handle_commit(commit, revs);
 361                 commits->nr--;
 362         }
 363 }
 364
 365 static void handle_tag(const char *name, struct tag *tag)
 366 {
 367         unsigned long size;
 368         enum object_type type;
 369         char *buf;
 370         const char *tagger, *tagger_end, *message;
 371         size_t message_size = 0;
 372         struct object *tagged;
 373         int tagged_mark;
 374         struct commit *p;
 375
 376         /* Trees have no identifer in fast-export output, thus we have no way
 377          * to output tags of trees, tags of tags of trees, etc.  Simply omit
 378          * such tags.
 379          */
 380         tagged = tag->tagged;
 381         while (tagged->type == OBJ_TAG) {
 382                 tagged = ((struct tag *)tagged)->tagged;
 383         }
 384         if (tagged->type == OBJ_TREE) {
 385                 warning("Omitting tag %s,\nsince tags of trees (or tags of tags of trees, etc.) are not supported.",
 386                         sha1_to_hex(tag->object.sha1));
 387                 return;
 388         }
 389
 390         buf = read_sha1_file(tag->object.sha1, &type, &size);
 391         if (!buf)
 392                 die ("Could not read tag %s", sha1_to_hex(tag->object.sha1));
 393         message = memmem(buf, size, "\n\n", 2);
 394         if (message) {
 395                 message += 2;
 396                 message_size = strlen(message);
 397         }
 398         tagger = memmem(buf, message ? message - buf : size, "\ntagger ", 8);
 399         if (!tagger) {
 400                 if (fake_missing_tagger)
 401                         tagger = "tagger Unspecified Tagger "
 402                                 "<unspecified-tagger> 0 +0000";
 403                 else
 404                         tagger = "";
 405                 tagger_end = tagger + strlen(tagger);
 406         } else {
 407                 tagger++;
 408                 tagger_end = strchrnul(tagger, '\n');
 409         }
 410
 411         /* handle signed tags */
 412         if (message) {
 413                 const char *signature = strstr(message,
 414                                                "\n-----BEGIN PGP SIGNATURE-----\n");
 415                 if (signature)
 416                         switch(signed_tag_mode) {
 417                         case ABORT:
 418                                 die ("Encountered signed tag %s; use "
 419                                      "--signed-tag=<mode> to handle it.",
 420                                      sha1_to_hex(tag->object.sha1));
 421                         case WARN:
 422                                 warning ("Exporting signed tag %s",
 423                                          sha1_to_hex(tag->object.sha1));
 424                                 /* fallthru */
 425                         case VERBATIM:
 426                                 break;
 427                         case STRIP:
 428                                 message_size = signature + 1 - message;
 429                                 break;
 430                         }
 431         }
 432
 433         /* handle tag->tagged having been filtered out due to paths specified */
 434         tagged = tag->tagged;
 435         tagged_mark = get_object_mark(tagged);
 436         if (!tagged_mark) {
 437                 switch(tag_of_filtered_mode) {
 438                 case ABORT:
 439                         die ("Tag %s tags unexported object; use "
 440                              "--tag-of-filtered-object=<mode> to handle it.",
 441                              sha1_to_hex(tag->object.sha1));
 442                 case DROP:
 443                         /* Ignore this tag altogether */
 444                         return;
 445                 case REWRITE:
 446                         if (tagged->type != OBJ_COMMIT) {
 447                                 die ("Tag %s tags unexported %s!",
 448                                      sha1_to_hex(tag->object.sha1),
 449                                      typename(tagged->type));
 450                         }
 451                         p = (struct commit *)tagged;
 452                         for (;;) {
 453                                 if (p->parents && p->parents->next)
 454                                         break;
 455                                 if (p->object.flags & UNINTERESTING)
 456                                         break;
 457                                 if (!(p->object.flags & TREESAME))
 458                                         break;
 459                                 if (!p->parents)
 460                                         die ("Can't find replacement commit for tag %s\n",
 461                                              sha1_to_hex(tag->object.sha1));
 462                                 p = p->parents->item;
 463                         }
 464                         tagged_mark = get_object_mark(&p->object);
 465                 }
 466         }
 467
 468         if (!prefixcmp(name, "refs/tags/"))
 469                 name += 10;
 470         printf("tag %s\nfrom :%d\n%.*s%sdata %d\n%.*s\n",
 471                name, tagged_mark,
 472                (int)(tagger_end - tagger), tagger,
 473                tagger == tagger_end ? "" : "\n",
 474                (int)message_size, (int)message_size, message ? message : "");
 475 }
 476
 477 static void get_tags_and_duplicates(struct object_array *pending,
 478                                     struct string_list *extra_refs)
 479 {
 480         struct tag *tag;
 481         int i;
 482
 483         for (i = 0; i < pending->nr; i++) {
 484                 struct object_array_entry *e = pending->objects + i;
 485                 unsigned char sha1[20];
 486                 struct commit *commit = commit;
 487                 char *full_name;
 488
 489                 if (dwim_ref(e->name, strlen(e->name), sha1, &full_name) != 1)
 490                         continue;
 491
 492                 switch (e->item->type) {
 493                 case OBJ_COMMIT:
 494                         commit = (struct commit *)e->item;
 495                         break;
 496                 case OBJ_TAG:
 497                         tag = (struct tag *)e->item;
 498
 499                         /* handle nested tags */
 500                         while (tag && tag->object.type == OBJ_TAG) {
 501                                 parse_object(tag->object.sha1);
 502                                 string_list_append(extra_refs, full_name)->util = tag;
 503                                 tag = (struct tag *)tag->tagged;
 504                         }
 505                         if (!tag)
 506                                 die ("Tag %s points nowhere?", e->name);
 507                         switch(tag->object.type) {
 508                         case OBJ_COMMIT:
 509                                 commit = (struct commit *)tag;
 510                                 break;
 511                         case OBJ_BLOB:
 512                                 handle_object(tag->object.sha1);
 513                                 continue;
 514                         default: /* OBJ_TAG (nested tags) is already handled */
 515                                 warning("Tag points to object of unexpected type %s, skipping.",
 516                                         typename(tag->object.type));
 517                                 continue;
 518                         }
 519                         break;
 520                 default:
 521                         warning("%s: Unexpected object of type %s, skipping.",
 522                                 e->name,
 523                                 typename(e->item->type));
 524                         continue;
 525                 }
 526                 if (commit->util)
 527                         /* more than one name for the same object */
 528                         string_list_append(extra_refs, full_name)->util = commit;
 529                 else
 530                         commit->util = full_name;
 531         }
 532 }
 533
 534 static void handle_tags_and_duplicates(struct string_list *extra_refs)
 535 {
 536         struct commit *commit;
 537         int i;
 538
 539         for (i = extra_refs->nr - 1; i >= 0; i--) {
 540                 const char *name = extra_refs->items[i].string;
 541                 struct object *object = extra_refs->items[i].util;
 542                 switch (object->type) {
 543                 case OBJ_TAG:
 544                         handle_tag(name, (struct tag *)object);
 545                         break;
 546                 case OBJ_COMMIT:
 547                         /* create refs pointing to already seen commits */
 548                         commit = (struct commit *)object;
 549                         printf("reset %s\nfrom :%d\n\n", name,
 550                                get_object_mark(&commit->object));
 551                         show_progress();
 552                         break;
 553                 }
 554         }
 555 }
 556
 557 static void export_marks(char *file)
 558 {
 559         unsigned int i;
 560         uint32_t mark;
 561         struct object_decoration *deco = idnums.hash;
 562         FILE *f;
 563         int e = 0;
 564
 565         f = fopen(file, "w");
 566         if (!f)
 567                 die_errno("Unable to open marks file %s for writing.", file);
 568
 569         for (i = 0; i < idnums.size; i++) {
 570                 if (deco->base && deco->base->type == 1) {
 571                         mark = ptr_to_mark(deco->decoration);
 572                         if (fprintf(f, ":%"PRIu32" %s\n", mark,
 573                                 sha1_to_hex(deco->base->sha1)) < 0) {
 574                             e = 1;
 575                             break;
 576                         }
 577                 }
 578                 deco++;
 579         }
 580
 581         e |= ferror(f);
 582         e |= fclose(f);
 583         if (e)
 584                 error("Unable to write marks file %s.", file);
 585 }
 586
 587 static void import_marks(char *input_file)
 588 {
 589         char line[512];
 590         FILE *f = fopen(input_file, "r");
 591         if (!f)
 592                 die_errno("cannot read '%s'", input_file);
 593
 594         while (fgets(line, sizeof(line), f)) {
 595                 uint32_t mark;
 596                 char *line_end, *mark_end;
 597                 unsigned char sha1[20];
 598                 struct object *object;
 599
 600                 line_end = strchr(line, '\n');
 601                 if (line[0] != ':' || !line_end)
 602                         die("corrupt mark line: %s", line);
 603                 *line_end = '\0';
 604
 605                 mark = strtoumax(line + 1, &mark_end, 10);
 606                 if (!mark || mark_end == line + 1
 607                         || *mark_end != ' ' || get_sha1(mark_end + 1, sha1))
 608                         die("corrupt mark line: %s", line);
 609
 610                 object = parse_object(sha1);
 611                 if (!object)
 612                         die ("Could not read blob %s", sha1_to_hex(sha1));
 613
 614                 if (object->flags & SHOWN)
 615                         error("Object %s already has a mark", sha1_to_hex(sha1));
 616
 617                 mark_object(object, mark);
 618                 if (last_idnum < mark)
 619                         last_idnum = mark;
 620
 621                 object->flags |= SHOWN;
 622         }
 623         fclose(f);
 624 }
 625
 626 int cmd_fast_export(int argc, const char **argv, const char *prefix)
 627 {
 628         struct rev_info revs;
 629         struct object_array commits = OBJECT_ARRAY_INIT;
 630         struct string_list extra_refs = STRING_LIST_INIT_NODUP;
 631         struct commit *commit;
 632         char *export_filename = NULL, *import_filename = NULL;
 633         struct option options[] = {
 634                 OPT_INTEGER(0, "progress", &progress,
 635                             N_("show progress after <n> objects")),
 636                 OPT_CALLBACK(0, "signed-tags", &signed_tag_mode, N_("mode"),
 637                              N_("select handling of signed tags"),
 638                              parse_opt_signed_tag_mode),
 639                 OPT_CALLBACK(0, "tag-of-filtered-object", &tag_of_filtered_mode, N_("mode"),
 640                              N_("select handling of tags that tag filtered objects"),
 641                              parse_opt_tag_of_filtered_mode),
 642                 OPT_STRING(0, "export-marks", &export_filename, N_("file"),
 643                              N_("Dump marks to this file")),
 644                 OPT_STRING(0, "import-marks", &import_filename, N_("file"),
 645                              N_("Import marks from this file")),
 646                 OPT_BOOLEAN(0, "fake-missing-tagger", &fake_missing_tagger,
 647                              N_("Fake a tagger when tags lack one")),
 648                 OPT_BOOLEAN(0, "full-tree", &full_tree,
 649                              N_("Output full tree for each commit")),
 650                 OPT_BOOLEAN(0, "use-done-feature", &use_done_feature,
 651                              N_("Use the done feature to terminate the stream")),
 652                 OPT_BOOL(0, "no-data", &no_data, N_("Skip output of blob data")),
 653                 OPT_END()
 654         };
 655
 656         if (argc == 1)
 657                 usage_with_options (fast_export_usage, options);
 658
 659         /* we handle encodings */
 660         git_config(git_default_config, NULL);
 661
 662         init_revisions(&revs, prefix);
 663         revs.topo_order = 1;
 664         revs.show_source = 1;
 665         revs.rewrite_parents = 1;
 666         argc = setup_revisions(argc, argv, &revs, NULL);
 667         argc = parse_options(argc, argv, prefix, options, fast_export_usage, 0);
 668         if (argc > 1)
 669                 usage_with_options (fast_export_usage, options);
 670
 671         if (use_done_feature)
 672                 printf("feature done\n");
 673
 674         if (import_filename)
 675                 import_marks(import_filename);
 676
 677         if (import_filename && revs.prune_data.nr)
 678                 full_tree = 1;
 679
 680         get_tags_and_duplicates(&revs.pending, &extra_refs);
 681
 682         if (prepare_revision_walk(&revs))
 683                 die("revision walk setup failed");
 684         revs.diffopt.format_callback = show_filemodify;
 685         DIFF_OPT_SET(&revs.diffopt, RECURSIVE);
 686         while ((commit = get_revision(&revs))) {
 687                 if (has_unshown_parent(commit)) {
 688                         add_object_array(&commit->object, NULL, &commits);
 689                 }
 690                 else {
 691                         handle_commit(commit, &revs);
 692                         handle_tail(&commits, &revs);
 693                 }
 694         }
 695
 696         handle_tags_and_duplicates(&extra_refs);
 697
 698         if (export_filename)
 699                 export_marks(export_filename);
 700
 701         if (use_done_feature)
 702                 printf("done\n");
 703
 704         return 0;
 705 }