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 export_blob(const unsigned char *sha1)
 117 {
 118         unsigned long size;
 119         enum object_type type;
 120         char *buf;
 121         struct object *object;
 122         int eaten;
 123
 124         if (no_data)
 125                 return;
 126
 127         if (is_null_sha1(sha1))
 128                 return;
 129
 130         object = lookup_object(sha1);
 131         if (object && object->flags & SHOWN)
 132                 return;
 133
 134         buf = read_sha1_file(sha1, &type, &size);
 135         if (!buf)
 136                 die ("Could not read blob %s", sha1_to_hex(sha1));
 137         if (check_sha1_signature(sha1, buf, size, typename(type)) < 0)
 138                 die("sha1 mismatch in blob %s", sha1_to_hex(sha1));
 139         object = parse_object_buffer(sha1, type, size, buf, &eaten);
 140         if (!object)
 141                 die("Could not read blob %s", sha1_to_hex(sha1));
 142
 143         mark_next_object(object);
 144
 145         printf("blob\nmark :%"PRIu32"\ndata %lu\n", last_idnum, size);
 146         if (size && fwrite(buf, size, 1, stdout) != 1)
 147                 die_errno ("Could not write blob '%s'", sha1_to_hex(sha1));
 148         printf("\n");
 149
 150         show_progress();
 151
 152         object->flags |= SHOWN;
 153         if (!eaten)
 154                 free(buf);
 155 }
 156
 157 static int depth_first(const void *a_, const void *b_)
 158 {
 159         const struct diff_filepair *a = *((const struct diff_filepair **)a_);
 160         const struct diff_filepair *b = *((const struct diff_filepair **)b_);
 161         const char *name_a, *name_b;
 162         int len_a, len_b, len;
 163         int cmp;
 164
 165         name_a = a->one ? a->one->path : a->two->path;
 166         name_b = b->one ? b->one->path : b->two->path;
 167
 168         len_a = strlen(name_a);
 169         len_b = strlen(name_b);
 170         len = (len_a < len_b) ? len_a : len_b;
 171
 172         /* strcmp will sort 'd' before 'd/e', we want 'd/e' before 'd' */
 173         cmp = memcmp(name_a, name_b, len);
 174         if (cmp)
 175                 return cmp;
 176         cmp = len_b - len_a;
 177         if (cmp)
 178                 return cmp;
 179         /*
 180          * Move 'R'ename entries last so that all references of the file
 181          * appear in the output before it is renamed (e.g., when a file
 182          * was copied and renamed in the same commit).
 183          */
 184         return (a->status == 'R') - (b->status == 'R');
 185 }
 186
 187 static void print_path(const char *path)
 188 {
 189         int need_quote = quote_c_style(path, NULL, NULL, 0);
 190         if (need_quote)
 191                 quote_c_style(path, NULL, stdout, 0);
 192         else if (strchr(path, ' '))
 193                 printf("\"%s\"", path);
 194         else
 195                 printf("%s", path);
 196 }
 197
 198 static void show_filemodify(struct diff_queue_struct *q,
 199                             struct diff_options *options, void *data)
 200 {
 201         int i;
 202
 203         /*
 204          * Handle files below a directory first, in case they are all deleted
 205          * and the directory changes to a file or symlink.
 206          */
 207         qsort(q->queue, q->nr, sizeof(q->queue[0]), depth_first);
 208
 209         for (i = 0; i < q->nr; i++) {
 210                 struct diff_filespec *ospec = q->queue[i]->one;
 211                 struct diff_filespec *spec = q->queue[i]->two;
 212
 213                 switch (q->queue[i]->status) {
 214                 case DIFF_STATUS_DELETED:
 215                         printf("D ");
 216                         print_path(spec->path);
 217                         putchar('\n');
 218                         break;
 219
 220                 case DIFF_STATUS_COPIED:
 221                 case DIFF_STATUS_RENAMED:
 222                         printf("%c ", q->queue[i]->status);
 223                         print_path(ospec->path);
 224                         putchar(' ');
 225                         print_path(spec->path);
 226                         putchar('\n');
 227
 228                         if (!hashcmp(ospec->sha1, spec->sha1) &&
 229                             ospec->mode == spec->mode)
 230                                 break;
 231                         /* fallthrough */
 232
 233                 case DIFF_STATUS_TYPE_CHANGED:
 234                 case DIFF_STATUS_MODIFIED:
 235                 case DIFF_STATUS_ADDED:
 236                         /*
 237                          * Links refer to objects in another repositories;
 238                          * output the SHA-1 verbatim.
 239                          */
 240                         if (no_data || S_ISGITLINK(spec->mode))
 241                                 printf("M %06o %s ", spec->mode,
 242                                        sha1_to_hex(spec->sha1));
 243                         else {
 244                                 struct object *object = lookup_object(spec->sha1);
 245                                 printf("M %06o :%d ", spec->mode,
 246                                        get_object_mark(object));
 247                         }
 248                         print_path(spec->path);
 249                         putchar('\n');
 250                         break;
 251
 252                 default:
 253                         die("Unexpected comparison status '%c' for %s, %s",
 254                                 q->queue[i]->status,
 255                                 ospec->path ? ospec->path : "none",
 256                                 spec->path ? spec->path : "none");
 257                 }
 258         }
 259 }
 260
 261 static const char *find_encoding(const char *begin, const char *end)
 262 {
 263         const char *needle = "\nencoding ";
 264         char *bol, *eol;
 265
 266         bol = memmem(begin, end ? end - begin : strlen(begin),
 267                      needle, strlen(needle));
 268         if (!bol)
 269                 return git_commit_encoding;
 270         bol += strlen(needle);
 271         eol = strchrnul(bol, '\n');
 272         *eol = '\0';
 273         return bol;
 274 }
 275
 276 static void handle_commit(struct commit *commit, struct rev_info *rev)
 277 {
 278         int saved_output_format = rev->diffopt.output_format;
 279         const char *author, *author_end, *committer, *committer_end;
 280         const char *encoding, *message;
 281         char *reencoded = NULL;
 282         struct commit_list *p;
 283         int i;
 284
 285         rev->diffopt.output_format = DIFF_FORMAT_CALLBACK;
 286
 287         parse_commit(commit);
 288         author = strstr(commit->buffer, "\nauthor ");
 289         if (!author)
 290                 die ("Could not find author in commit %s",
 291                      sha1_to_hex(commit->object.sha1));
 292         author++;
 293         author_end = strchrnul(author, '\n');
 294         committer = strstr(author_end, "\ncommitter ");
 295         if (!committer)
 296                 die ("Could not find committer in commit %s",
 297                      sha1_to_hex(commit->object.sha1));
 298         committer++;
 299         committer_end = strchrnul(committer, '\n');
 300         message = strstr(committer_end, "\n\n");
 301         encoding = find_encoding(committer_end, message);
 302         if (message)
 303                 message += 2;
 304
 305         if (commit->parents &&
 306             get_object_mark(&commit->parents->item->object) != 0 &&
 307             !full_tree) {
 308                 parse_commit(commit->parents->item);
 309                 diff_tree_sha1(commit->parents->item->tree->object.sha1,
 310                                commit->tree->object.sha1, "", &rev->diffopt);
 311         }
 312         else
 313                 diff_root_tree_sha1(commit->tree->object.sha1,
 314                                     "", &rev->diffopt);
 315
 316         /* Export the referenced blobs, and remember the marks. */
 317         for (i = 0; i < diff_queued_diff.nr; i++)
 318                 if (!S_ISGITLINK(diff_queued_diff.queue[i]->two->mode))
 319                         export_blob(diff_queued_diff.queue[i]->two->sha1);
 320
 321         mark_next_object(&commit->object);
 322         if (!is_encoding_utf8(encoding))
 323                 reencoded = reencode_string(message, "UTF-8", encoding);
 324         if (!commit->parents)
 325                 printf("reset %s\n", (const char*)commit->util);
 326         printf("commit %s\nmark :%"PRIu32"\n%.*s\n%.*s\ndata %u\n%s",
 327                (const char *)commit->util, last_idnum,
 328                (int)(author_end - author), author,
 329                (int)(committer_end - committer), committer,
 330                (unsigned)(reencoded
 331                           ? strlen(reencoded) : message
 332                           ? strlen(message) : 0),
 333                reencoded ? reencoded : message ? message : "");
 334         free(reencoded);
 335
 336         for (i = 0, p = commit->parents; p; p = p->next) {
 337                 int mark = get_object_mark(&p->item->object);
 338                 if (!mark)
 339                         continue;
 340                 if (i == 0)
 341                         printf("from :%d\n", mark);
 342                 else
 343                         printf("merge :%d\n", mark);
 344                 i++;
 345         }
 346
 347         if (full_tree)
 348                 printf("deleteall\n");
 349         log_tree_diff_flush(rev);
 350         rev->diffopt.output_format = saved_output_format;
 351
 352         printf("\n");
 353
 354         show_progress();
 355 }
 356
 357 static void handle_tail(struct object_array *commits, struct rev_info *revs)
 358 {
 359         struct commit *commit;
 360         while (commits->nr) {
 361                 commit = (struct commit *)commits->objects[commits->nr - 1].item;
 362                 if (has_unshown_parent(commit))
 363                         return;
 364                 handle_commit(commit, revs);
 365                 commits->nr--;
 366         }
 367 }
 368
 369 static void handle_tag(const char *name, struct tag *tag)
 370 {
 371         unsigned long size;
 372         enum object_type type;
 373         char *buf;
 374         const char *tagger, *tagger_end, *message;
 375         size_t message_size = 0;
 376         struct object *tagged;
 377         int tagged_mark;
 378         struct commit *p;
 379
 380         /* Trees have no identifer in fast-export output, thus we have no way
 381          * to output tags of trees, tags of tags of trees, etc.  Simply omit
 382          * such tags.
 383          */
 384         tagged = tag->tagged;
 385         while (tagged->type == OBJ_TAG) {
 386                 tagged = ((struct tag *)tagged)->tagged;
 387         }
 388         if (tagged->type == OBJ_TREE) {
 389                 warning("Omitting tag %s,\nsince tags of trees (or tags of tags of trees, etc.) are not supported.",
 390                         sha1_to_hex(tag->object.sha1));
 391                 return;
 392         }
 393
 394         buf = read_sha1_file(tag->object.sha1, &type, &size);
 395         if (!buf)
 396                 die ("Could not read tag %s", sha1_to_hex(tag->object.sha1));
 397         message = memmem(buf, size, "\n\n", 2);
 398         if (message) {
 399                 message += 2;
 400                 message_size = strlen(message);
 401         }
 402         tagger = memmem(buf, message ? message - buf : size, "\ntagger ", 8);
 403         if (!tagger) {
 404                 if (fake_missing_tagger)
 405                         tagger = "tagger Unspecified Tagger "
 406                                 "<unspecified-tagger> 0 +0000";
 407                 else
 408                         tagger = "";
 409                 tagger_end = tagger + strlen(tagger);
 410         } else {
 411                 tagger++;
 412                 tagger_end = strchrnul(tagger, '\n');
 413         }
 414
 415         /* handle signed tags */
 416         if (message) {
 417                 const char *signature = strstr(message,
 418                                                "\n-----BEGIN PGP SIGNATURE-----\n");
 419                 if (signature)
 420                         switch(signed_tag_mode) {
 421                         case ABORT:
 422                                 die ("Encountered signed tag %s; use "
 423                                      "--signed-tag=<mode> to handle it.",
 424                                      sha1_to_hex(tag->object.sha1));
 425                         case WARN:
 426                                 warning ("Exporting signed tag %s",
 427                                          sha1_to_hex(tag->object.sha1));
 428                                 /* fallthru */
 429                         case VERBATIM:
 430                                 break;
 431                         case STRIP:
 432                                 message_size = signature + 1 - message;
 433                                 break;
 434                         }
 435         }
 436
 437         /* handle tag->tagged having been filtered out due to paths specified */
 438         tagged = tag->tagged;
 439         tagged_mark = get_object_mark(tagged);
 440         if (!tagged_mark) {
 441                 switch(tag_of_filtered_mode) {
 442                 case ABORT:
 443                         die ("Tag %s tags unexported object; use "
 444                              "--tag-of-filtered-object=<mode> to handle it.",
 445                              sha1_to_hex(tag->object.sha1));
 446                 case DROP:
 447                         /* Ignore this tag altogether */
 448                         return;
 449                 case REWRITE:
 450                         if (tagged->type != OBJ_COMMIT) {
 451                                 die ("Tag %s tags unexported %s!",
 452                                      sha1_to_hex(tag->object.sha1),
 453                                      typename(tagged->type));
 454                         }
 455                         p = (struct commit *)tagged;
 456                         for (;;) {
 457                                 if (p->parents && p->parents->next)
 458                                         break;
 459                                 if (p->object.flags & UNINTERESTING)
 460                                         break;
 461                                 if (!(p->object.flags & TREESAME))
 462                                         break;
 463                                 if (!p->parents)
 464                                         die ("Can't find replacement commit for tag %s\n",
 465                                              sha1_to_hex(tag->object.sha1));
 466                                 p = p->parents->item;
 467                         }
 468                         tagged_mark = get_object_mark(&p->object);
 469                 }
 470         }
 471
 472         if (!prefixcmp(name, "refs/tags/"))
 473                 name += 10;
 474         printf("tag %s\nfrom :%d\n%.*s%sdata %d\n%.*s\n",
 475                name, tagged_mark,
 476                (int)(tagger_end - tagger), tagger,
 477                tagger == tagger_end ? "" : "\n",
 478                (int)message_size, (int)message_size, message ? message : "");
 479 }
 480
 481 static void get_tags_and_duplicates(struct rev_cmdline_info *info,
 482                                     struct string_list *extra_refs)
 483 {
 484         struct tag *tag;
 485         int i;
 486
 487         for (i = 0; i < info->nr; i++) {
 488                 struct rev_cmdline_entry *e = info->rev + i;
 489                 unsigned char sha1[20];
 490                 struct commit *commit;
 491                 char *full_name;
 492
 493                 if (e->flags & UNINTERESTING)
 494                         continue;
 495
 496                 if (dwim_ref(e->name, strlen(e->name), sha1, &full_name) != 1)
 497                         continue;
 498
 499                 switch (e->item->type) {
 500                 case OBJ_COMMIT:
 501                         commit = (struct commit *)e->item;
 502                         break;
 503                 case OBJ_TAG:
 504                         tag = (struct tag *)e->item;
 505
 506                         /* handle nested tags */
 507                         while (tag && tag->object.type == OBJ_TAG) {
 508                                 parse_object(tag->object.sha1);
 509                                 string_list_append(extra_refs, full_name)->util = tag;
 510                                 tag = (struct tag *)tag->tagged;
 511                         }
 512                         if (!tag)
 513                                 die ("Tag %s points nowhere?", e->name);
 514                         switch(tag->object.type) {
 515                         case OBJ_COMMIT:
 516                                 commit = (struct commit *)tag;
 517                                 break;
 518                         case OBJ_BLOB:
 519                                 export_blob(tag->object.sha1);
 520                                 continue;
 521                         default: /* OBJ_TAG (nested tags) is already handled */
 522                                 warning("Tag points to object of unexpected type %s, skipping.",
 523                                         typename(tag->object.type));
 524                                 continue;
 525                         }
 526                         break;
 527                 default:
 528                         warning("%s: Unexpected object of type %s, skipping.",
 529                                 e->name,
 530                                 typename(e->item->type));
 531                         continue;
 532                 }
 533
 534                 /*
 535                  * This ref will not be updated through a commit, lets make
 536                  * sure it gets properly updated eventually.
 537                  */
 538                 if (commit->util || commit->object.flags & SHOWN)
 539                         string_list_append(extra_refs, full_name)->util = commit;
 540                 if (!commit->util)
 541                         commit->util = full_name;
 542         }
 543 }
 544
 545 static void handle_tags_and_duplicates(struct string_list *extra_refs)
 546 {
 547         struct commit *commit;
 548         int i;
 549
 550         for (i = extra_refs->nr - 1; i >= 0; i--) {
 551                 const char *name = extra_refs->items[i].string;
 552                 struct object *object = extra_refs->items[i].util;
 553                 switch (object->type) {
 554                 case OBJ_TAG:
 555                         handle_tag(name, (struct tag *)object);
 556                         break;
 557                 case OBJ_COMMIT:
 558                         /* create refs pointing to already seen commits */
 559                         commit = (struct commit *)object;
 560                         printf("reset %s\nfrom :%d\n\n", name,
 561                                get_object_mark(&commit->object));
 562                         show_progress();
 563                         break;
 564                 }
 565         }
 566 }
 567
 568 static void export_marks(char *file)
 569 {
 570         unsigned int i;
 571         uint32_t mark;
 572         struct object_decoration *deco = idnums.hash;
 573         FILE *f;
 574         int e = 0;
 575
 576         f = fopen(file, "w");
 577         if (!f)
 578                 die_errno("Unable to open marks file %s for writing.", file);
 579
 580         for (i = 0; i < idnums.size; i++) {
 581                 if (deco->base && deco->base->type == 1) {
 582                         mark = ptr_to_mark(deco->decoration);
 583                         if (fprintf(f, ":%"PRIu32" %s\n", mark,
 584                                 sha1_to_hex(deco->base->sha1)) < 0) {
 585                             e = 1;
 586                             break;
 587                         }
 588                 }
 589                 deco++;
 590         }
 591
 592         e |= ferror(f);
 593         e |= fclose(f);
 594         if (e)
 595                 error("Unable to write marks file %s.", file);
 596 }
 597
 598 static void import_marks(char *input_file)
 599 {
 600         char line[512];
 601         FILE *f = fopen(input_file, "r");
 602         if (!f)
 603                 die_errno("cannot read '%s'", input_file);
 604
 605         while (fgets(line, sizeof(line), f)) {
 606                 uint32_t mark;
 607                 char *line_end, *mark_end;
 608                 unsigned char sha1[20];
 609                 struct object *object;
 610
 611                 line_end = strchr(line, '\n');
 612                 if (line[0] != ':' || !line_end)
 613                         die("corrupt mark line: %s", line);
 614                 *line_end = '\0';
 615
 616                 mark = strtoumax(line + 1, &mark_end, 10);
 617                 if (!mark || mark_end == line + 1
 618                         || *mark_end != ' ' || get_sha1(mark_end + 1, sha1))
 619                         die("corrupt mark line: %s", line);
 620
 621                 object = parse_object(sha1);
 622                 if (!object)
 623                         die ("Could not read blob %s", sha1_to_hex(sha1));
 624
 625                 if (object->flags & SHOWN)
 626                         error("Object %s already has a mark", sha1_to_hex(sha1));
 627
 628                 if (object->type != OBJ_COMMIT)
 629                         /* only commits */
 630                         continue;
 631
 632                 mark_object(object, mark);
 633                 if (last_idnum < mark)
 634                         last_idnum = mark;
 635
 636                 object->flags |= SHOWN;
 637         }
 638         fclose(f);
 639 }
 640
 641 int cmd_fast_export(int argc, const char **argv, const char *prefix)
 642 {
 643         struct rev_info revs;
 644         struct object_array commits = OBJECT_ARRAY_INIT;
 645         struct string_list extra_refs = STRING_LIST_INIT_NODUP;
 646         struct commit *commit;
 647         char *export_filename = NULL, *import_filename = NULL;
 648         struct option options[] = {
 649                 OPT_INTEGER(0, "progress", &progress,
 650                             N_("show progress after <n> objects")),
 651                 OPT_CALLBACK(0, "signed-tags", &signed_tag_mode, N_("mode"),
 652                              N_("select handling of signed tags"),
 653                              parse_opt_signed_tag_mode),
 654                 OPT_CALLBACK(0, "tag-of-filtered-object", &tag_of_filtered_mode, N_("mode"),
 655                              N_("select handling of tags that tag filtered objects"),
 656                              parse_opt_tag_of_filtered_mode),
 657                 OPT_STRING(0, "export-marks", &export_filename, N_("file"),
 658                              N_("Dump marks to this file")),
 659                 OPT_STRING(0, "import-marks", &import_filename, N_("file"),
 660                              N_("Import marks from this file")),
 661                 OPT_BOOLEAN(0, "fake-missing-tagger", &fake_missing_tagger,
 662                              N_("Fake a tagger when tags lack one")),
 663                 OPT_BOOLEAN(0, "full-tree", &full_tree,
 664                              N_("Output full tree for each commit")),
 665                 OPT_BOOLEAN(0, "use-done-feature", &use_done_feature,
 666                              N_("Use the done feature to terminate the stream")),
 667                 OPT_BOOL(0, "no-data", &no_data, N_("Skip output of blob data")),
 668                 OPT_END()
 669         };
 670
 671         if (argc == 1)
 672                 usage_with_options (fast_export_usage, options);
 673
 674         /* we handle encodings */
 675         git_config(git_default_config, NULL);
 676
 677         init_revisions(&revs, prefix);
 678         revs.topo_order = 1;
 679         revs.show_source = 1;
 680         revs.rewrite_parents = 1;
 681         argc = setup_revisions(argc, argv, &revs, NULL);
 682         argc = parse_options(argc, argv, prefix, options, fast_export_usage, 0);
 683         if (argc > 1)
 684                 usage_with_options (fast_export_usage, options);
 685
 686         if (use_done_feature)
 687                 printf("feature done\n");
 688
 689         if (import_filename)
 690                 import_marks(import_filename);
 691
 692         if (import_filename && revs.prune_data.nr)
 693                 full_tree = 1;
 694
 695         get_tags_and_duplicates(&revs.cmdline, &extra_refs);
 696
 697         if (prepare_revision_walk(&revs))
 698                 die("revision walk setup failed");
 699         revs.diffopt.format_callback = show_filemodify;
 700         DIFF_OPT_SET(&revs.diffopt, RECURSIVE);
 701         while ((commit = get_revision(&revs))) {
 702                 if (has_unshown_parent(commit)) {
 703                         add_object_array(&commit->object, NULL, &commits);
 704                 }
 705                 else {
 706                         handle_commit(commit, &revs);
 707                         handle_tail(&commits, &revs);
 708                 }
 709         }
 710
 711         handle_tags_and_duplicates(&extra_refs);
 712
 713         if (export_filename)
 714                 export_marks(export_filename);
 715
 716         if (use_done_feature)
 717                 printf("done\n");
 718
 719         return 0;
 720 }