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 #include "remote.h"
  21
  22 static const char *fast_export_usage[] = {
  23         N_("git fast-export [rev-list-opts]"),
  24         NULL
  25 };
  26
  27 static int progress;
  28 static enum { ABORT, VERBATIM, WARN, WARN_STRIP, STRIP } signed_tag_mode = ABORT;
  29 static enum { ERROR, DROP, REWRITE } tag_of_filtered_mode = ERROR;
  30 static int fake_missing_tagger;
  31 static int use_done_feature;
  32 static int no_data;
  33 static int full_tree;
  34 static struct string_list extra_refs = STRING_LIST_INIT_NODUP;
  35 static struct refspec *refspecs;
  36 static int refspecs_nr;
  37
  38 static int parse_opt_signed_tag_mode(const struct option *opt,
  39                                      const char *arg, int unset)
  40 {
  41         if (unset || !strcmp(arg, "abort"))
  42                 signed_tag_mode = ABORT;
  43         else if (!strcmp(arg, "verbatim") || !strcmp(arg, "ignore"))
  44                 signed_tag_mode = VERBATIM;
  45         else if (!strcmp(arg, "warn"))
  46                 signed_tag_mode = WARN;
  47         else if (!strcmp(arg, "warn-strip"))
  48                 signed_tag_mode = WARN_STRIP;
  49         else if (!strcmp(arg, "strip"))
  50                 signed_tag_mode = STRIP;
  51         else
  52                 return error("Unknown signed-tags mode: %s", arg);
  53         return 0;
  54 }
  55
  56 static int parse_opt_tag_of_filtered_mode(const struct option *opt,
  57                                           const char *arg, int unset)
  58 {
  59         if (unset || !strcmp(arg, "abort"))
  60                 tag_of_filtered_mode = ERROR;
  61         else if (!strcmp(arg, "drop"))
  62                 tag_of_filtered_mode = DROP;
  63         else if (!strcmp(arg, "rewrite"))
  64                 tag_of_filtered_mode = REWRITE;
  65         else
  66                 return error("Unknown tag-of-filtered mode: %s", arg);
  67         return 0;
  68 }
  69
  70 static struct decoration idnums;
  71 static uint32_t last_idnum;
  72
  73 static int has_unshown_parent(struct commit *commit)
  74 {
  75         struct commit_list *parent;
  76
  77         for (parent = commit->parents; parent; parent = parent->next)
  78                 if (!(parent->item->object.flags & SHOWN) &&
  79                     !(parent->item->object.flags & UNINTERESTING))
  80                         return 1;
  81         return 0;
  82 }
  83
  84 /* Since intptr_t is C99, we do not use it here */
  85 static inline uint32_t *mark_to_ptr(uint32_t mark)
  86 {
  87         return ((uint32_t *)NULL) + mark;
  88 }
  89
  90 static inline uint32_t ptr_to_mark(void * mark)
  91 {
  92         return (uint32_t *)mark - (uint32_t *)NULL;
  93 }
  94
  95 static inline void mark_object(struct object *object, uint32_t mark)
  96 {
  97         add_decoration(&idnums, object, mark_to_ptr(mark));
  98 }
  99
 100 static inline void mark_next_object(struct object *object)
 101 {
 102         mark_object(object, ++last_idnum);
 103 }
 104
 105 static int get_object_mark(struct object *object)
 106 {
 107         void *decoration = lookup_decoration(&idnums, object);
 108         if (!decoration)
 109                 return 0;
 110         return ptr_to_mark(decoration);
 111 }
 112
 113 static void show_progress(void)
 114 {
 115         static int counter = 0;
 116         if (!progress)
 117                 return;
 118         if ((++counter % progress) == 0)
 119                 printf("progress %d objects\n", counter);
 120 }
 121
 122 static void export_blob(const unsigned char *sha1)
 123 {
 124         unsigned long size;
 125         enum object_type type;
 126         char *buf;
 127         struct object *object;
 128         int eaten;
 129
 130         if (no_data)
 131                 return;
 132
 133         if (is_null_sha1(sha1))
 134                 return;
 135
 136         object = lookup_object(sha1);
 137         if (object && object->flags & SHOWN)
 138                 return;
 139
 140         buf = read_sha1_file(sha1, &type, &size);
 141         if (!buf)
 142                 die ("Could not read blob %s", sha1_to_hex(sha1));
 143         if (check_sha1_signature(sha1, buf, size, typename(type)) < 0)
 144                 die("sha1 mismatch in blob %s", sha1_to_hex(sha1));
 145         object = parse_object_buffer(sha1, type, size, buf, &eaten);
 146         if (!object)
 147                 die("Could not read blob %s", sha1_to_hex(sha1));
 148
 149         mark_next_object(object);
 150
 151         printf("blob\nmark :%"PRIu32"\ndata %lu\n", last_idnum, size);
 152         if (size && fwrite(buf, size, 1, stdout) != 1)
 153                 die_errno ("Could not write blob '%s'", sha1_to_hex(sha1));
 154         printf("\n");
 155
 156         show_progress();
 157
 158         object->flags |= SHOWN;
 159         if (!eaten)
 160                 free(buf);
 161 }
 162
 163 static int depth_first(const void *a_, const void *b_)
 164 {
 165         const struct diff_filepair *a = *((const struct diff_filepair **)a_);
 166         const struct diff_filepair *b = *((const struct diff_filepair **)b_);
 167         const char *name_a, *name_b;
 168         int len_a, len_b, len;
 169         int cmp;
 170
 171         name_a = a->one ? a->one->path : a->two->path;
 172         name_b = b->one ? b->one->path : b->two->path;
 173
 174         len_a = strlen(name_a);
 175         len_b = strlen(name_b);
 176         len = (len_a < len_b) ? len_a : len_b;
 177
 178         /* strcmp will sort 'd' before 'd/e', we want 'd/e' before 'd' */
 179         cmp = memcmp(name_a, name_b, len);
 180         if (cmp)
 181                 return cmp;
 182         cmp = len_b - len_a;
 183         if (cmp)
 184                 return cmp;
 185         /*
 186          * Move 'R'ename entries last so that all references of the file
 187          * appear in the output before it is renamed (e.g., when a file
 188          * was copied and renamed in the same commit).
 189          */
 190         return (a->status == 'R') - (b->status == 'R');
 191 }
 192
 193 static void print_path(const char *path)
 194 {
 195         int need_quote = quote_c_style(path, NULL, NULL, 0);
 196         if (need_quote)
 197                 quote_c_style(path, NULL, stdout, 0);
 198         else if (strchr(path, ' '))
 199                 printf("\"%s\"", path);
 200         else
 201                 printf("%s", path);
 202 }
 203
 204 static void show_filemodify(struct diff_queue_struct *q,
 205                             struct diff_options *options, void *data)
 206 {
 207         int i;
 208
 209         /*
 210          * Handle files below a directory first, in case they are all deleted
 211          * and the directory changes to a file or symlink.
 212          */
 213         qsort(q->queue, q->nr, sizeof(q->queue[0]), depth_first);
 214
 215         for (i = 0; i < q->nr; i++) {
 216                 struct diff_filespec *ospec = q->queue[i]->one;
 217                 struct diff_filespec *spec = q->queue[i]->two;
 218
 219                 switch (q->queue[i]->status) {
 220                 case DIFF_STATUS_DELETED:
 221                         printf("D ");
 222                         print_path(spec->path);
 223                         putchar('\n');
 224                         break;
 225
 226                 case DIFF_STATUS_COPIED:
 227                 case DIFF_STATUS_RENAMED:
 228                         printf("%c ", q->queue[i]->status);
 229                         print_path(ospec->path);
 230                         putchar(' ');
 231                         print_path(spec->path);
 232                         putchar('\n');
 233
 234                         if (!hashcmp(ospec->sha1, spec->sha1) &&
 235                             ospec->mode == spec->mode)
 236                                 break;
 237                         /* fallthrough */
 238
 239                 case DIFF_STATUS_TYPE_CHANGED:
 240                 case DIFF_STATUS_MODIFIED:
 241                 case DIFF_STATUS_ADDED:
 242                         /*
 243                          * Links refer to objects in another repositories;
 244                          * output the SHA-1 verbatim.
 245                          */
 246                         if (no_data || S_ISGITLINK(spec->mode))
 247                                 printf("M %06o %s ", spec->mode,
 248                                        sha1_to_hex(spec->sha1));
 249                         else {
 250                                 struct object *object = lookup_object(spec->sha1);
 251                                 printf("M %06o :%d ", spec->mode,
 252                                        get_object_mark(object));
 253                         }
 254                         print_path(spec->path);
 255                         putchar('\n');
 256                         break;
 257
 258                 default:
 259                         die("Unexpected comparison status '%c' for %s, %s",
 260                                 q->queue[i]->status,
 261                                 ospec->path ? ospec->path : "none",
 262                                 spec->path ? spec->path : "none");
 263                 }
 264         }
 265 }
 266
 267 static const char *find_encoding(const char *begin, const char *end)
 268 {
 269         const char *needle = "\nencoding ";
 270         char *bol, *eol;
 271
 272         bol = memmem(begin, end ? end - begin : strlen(begin),
 273                      needle, strlen(needle));
 274         if (!bol)
 275                 return git_commit_encoding;
 276         bol += strlen(needle);
 277         eol = strchrnul(bol, '\n');
 278         *eol = '\0';
 279         return bol;
 280 }
 281
 282 static void handle_commit(struct commit *commit, struct rev_info *rev)
 283 {
 284         int saved_output_format = rev->diffopt.output_format;
 285         const char *author, *author_end, *committer, *committer_end;
 286         const char *encoding, *message;
 287         char *reencoded = NULL;
 288         struct commit_list *p;
 289         int i;
 290
 291         rev->diffopt.output_format = DIFF_FORMAT_CALLBACK;
 292
 293         parse_commit_or_die(commit);
 294         author = strstr(commit->buffer, "\nauthor ");
 295         if (!author)
 296                 die ("Could not find author in commit %s",
 297                      sha1_to_hex(commit->object.sha1));
 298         author++;
 299         author_end = strchrnul(author, '\n');
 300         committer = strstr(author_end, "\ncommitter ");
 301         if (!committer)
 302                 die ("Could not find committer in commit %s",
 303                      sha1_to_hex(commit->object.sha1));
 304         committer++;
 305         committer_end = strchrnul(committer, '\n');
 306         message = strstr(committer_end, "\n\n");
 307         encoding = find_encoding(committer_end, message);
 308         if (message)
 309                 message += 2;
 310
 311         if (commit->parents &&
 312             get_object_mark(&commit->parents->item->object) != 0 &&
 313             !full_tree) {
 314                 parse_commit_or_die(commit->parents->item);
 315                 diff_tree_sha1(commit->parents->item->tree->object.sha1,
 316                                commit->tree->object.sha1, "", &rev->diffopt);
 317         }
 318         else
 319                 diff_root_tree_sha1(commit->tree->object.sha1,
 320                                     "", &rev->diffopt);
 321
 322         /* Export the referenced blobs, and remember the marks. */
 323         for (i = 0; i < diff_queued_diff.nr; i++)
 324                 if (!S_ISGITLINK(diff_queued_diff.queue[i]->two->mode))
 325                         export_blob(diff_queued_diff.queue[i]->two->sha1);
 326
 327         mark_next_object(&commit->object);
 328         if (!is_encoding_utf8(encoding))
 329                 reencoded = reencode_string(message, "UTF-8", encoding);
 330         if (!commit->parents)
 331                 printf("reset %s\n", (const char*)commit->util);
 332         printf("commit %s\nmark :%"PRIu32"\n%.*s\n%.*s\ndata %u\n%s",
 333                (const char *)commit->util, last_idnum,
 334                (int)(author_end - author), author,
 335                (int)(committer_end - committer), committer,
 336                (unsigned)(reencoded
 337                           ? strlen(reencoded) : message
 338                           ? strlen(message) : 0),
 339                reencoded ? reencoded : message ? message : "");
 340         free(reencoded);
 341
 342         for (i = 0, p = commit->parents; p; p = p->next) {
 343                 int mark = get_object_mark(&p->item->object);
 344                 if (!mark)
 345                         continue;
 346                 if (i == 0)
 347                         printf("from :%d\n", mark);
 348                 else
 349                         printf("merge :%d\n", mark);
 350                 i++;
 351         }
 352
 353         if (full_tree)
 354                 printf("deleteall\n");
 355         log_tree_diff_flush(rev);
 356         rev->diffopt.output_format = saved_output_format;
 357
 358         printf("\n");
 359
 360         show_progress();
 361 }
 362
 363 static void handle_tail(struct object_array *commits, struct rev_info *revs)
 364 {
 365         struct commit *commit;
 366         while (commits->nr) {
 367                 commit = (struct commit *)commits->objects[commits->nr - 1].item;
 368                 if (has_unshown_parent(commit))
 369                         return;
 370                 handle_commit(commit, revs);
 371                 commits->nr--;
 372         }
 373 }
 374
 375 static void handle_tag(const char *name, struct tag *tag)
 376 {
 377         unsigned long size;
 378         enum object_type type;
 379         char *buf;
 380         const char *tagger, *tagger_end, *message;
 381         size_t message_size = 0;
 382         struct object *tagged;
 383         int tagged_mark;
 384         struct commit *p;
 385
 386         /* Trees have no identifier in fast-export output, thus we have no way
 387          * to output tags of trees, tags of tags of trees, etc.  Simply omit
 388          * such tags.
 389          */
 390         tagged = tag->tagged;
 391         while (tagged->type == OBJ_TAG) {
 392                 tagged = ((struct tag *)tagged)->tagged;
 393         }
 394         if (tagged->type == OBJ_TREE) {
 395                 warning("Omitting tag %s,\nsince tags of trees (or tags of tags of trees, etc.) are not supported.",
 396                         sha1_to_hex(tag->object.sha1));
 397                 return;
 398         }
 399
 400         buf = read_sha1_file(tag->object.sha1, &type, &size);
 401         if (!buf)
 402                 die ("Could not read tag %s", sha1_to_hex(tag->object.sha1));
 403         message = memmem(buf, size, "\n\n", 2);
 404         if (message) {
 405                 message += 2;
 406                 message_size = strlen(message);
 407         }
 408         tagger = memmem(buf, message ? message - buf : size, "\ntagger ", 8);
 409         if (!tagger) {
 410                 if (fake_missing_tagger)
 411                         tagger = "tagger Unspecified Tagger "
 412                                 "<unspecified-tagger> 0 +0000";
 413                 else
 414                         tagger = "";
 415                 tagger_end = tagger + strlen(tagger);
 416         } else {
 417                 tagger++;
 418                 tagger_end = strchrnul(tagger, '\n');
 419         }
 420
 421         /* handle signed tags */
 422         if (message) {
 423                 const char *signature = strstr(message,
 424                                                "\n-----BEGIN PGP SIGNATURE-----\n");
 425                 if (signature)
 426                         switch(signed_tag_mode) {
 427                         case ABORT:
 428                                 die ("Encountered signed tag %s; use "
 429                                      "--signed-tags=<mode> to handle it.",
 430                                      sha1_to_hex(tag->object.sha1));
 431                         case WARN:
 432                                 warning ("Exporting signed tag %s",
 433                                          sha1_to_hex(tag->object.sha1));
 434                                 /* fallthru */
 435                         case VERBATIM:
 436                                 break;
 437                         case WARN_STRIP:
 438                                 warning ("Stripping signature from tag %s",
 439                                          sha1_to_hex(tag->object.sha1));
 440                                 /* fallthru */
 441                         case STRIP:
 442                                 message_size = signature + 1 - message;
 443                                 break;
 444                         }
 445         }
 446
 447         /* handle tag->tagged having been filtered out due to paths specified */
 448         tagged = tag->tagged;
 449         tagged_mark = get_object_mark(tagged);
 450         if (!tagged_mark) {
 451                 switch(tag_of_filtered_mode) {
 452                 case ABORT:
 453                         die ("Tag %s tags unexported object; use "
 454                              "--tag-of-filtered-object=<mode> to handle it.",
 455                              sha1_to_hex(tag->object.sha1));
 456                 case DROP:
 457                         /* Ignore this tag altogether */
 458                         return;
 459                 case REWRITE:
 460                         if (tagged->type != OBJ_COMMIT) {
 461                                 die ("Tag %s tags unexported %s!",
 462                                      sha1_to_hex(tag->object.sha1),
 463                                      typename(tagged->type));
 464                         }
 465                         p = (struct commit *)tagged;
 466                         for (;;) {
 467                                 if (p->parents && p->parents->next)
 468                                         break;
 469                                 if (p->object.flags & UNINTERESTING)
 470                                         break;
 471                                 if (!(p->object.flags & TREESAME))
 472                                         break;
 473                                 if (!p->parents)
 474                                         die ("Can't find replacement commit for tag %s\n",
 475                                              sha1_to_hex(tag->object.sha1));
 476                                 p = p->parents->item;
 477                         }
 478                         tagged_mark = get_object_mark(&p->object);
 479                 }
 480         }
 481
 482         if (starts_with(name, "refs/tags/"))
 483                 name += 10;
 484         printf("tag %s\nfrom :%d\n%.*s%sdata %d\n%.*s\n",
 485                name, tagged_mark,
 486                (int)(tagger_end - tagger), tagger,
 487                tagger == tagger_end ? "" : "\n",
 488                (int)message_size, (int)message_size, message ? message : "");
 489 }
 490
 491 static struct commit *get_commit(struct rev_cmdline_entry *e, char *full_name)
 492 {
 493         switch (e->item->type) {
 494         case OBJ_COMMIT:
 495                 return (struct commit *)e->item;
 496         case OBJ_TAG: {
 497                 struct tag *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                 return (struct commit *)tag;
 508                 break;
 509         }
 510         default:
 511                 return NULL;
 512         }
 513 }
 514
 515 static void get_tags_and_duplicates(struct rev_cmdline_info *info)
 516 {
 517         int i;
 518
 519         for (i = 0; i < info->nr; i++) {
 520                 struct rev_cmdline_entry *e = info->rev + i;
 521                 unsigned char sha1[20];
 522                 struct commit *commit;
 523                 char *full_name;
 524
 525                 if (e->flags & UNINTERESTING)
 526                         continue;
 527
 528                 if (dwim_ref(e->name, strlen(e->name), sha1, &full_name) != 1)
 529                         continue;
 530
 531                 if (refspecs) {
 532                         char *private;
 533                         private = apply_refspecs(refspecs, refspecs_nr, full_name);
 534                         if (private) {
 535                                 free(full_name);
 536                                 full_name = private;
 537                         }
 538                 }
 539
 540                 commit = get_commit(e, full_name);
 541                 if (!commit) {
 542                         warning("%s: Unexpected object of type %s, skipping.",
 543                                 e->name,
 544                                 typename(e->item->type));
 545                         continue;
 546                 }
 547
 548                 switch(commit->object.type) {
 549                 case OBJ_COMMIT:
 550                         break;
 551                 case OBJ_BLOB:
 552                         export_blob(commit->object.sha1);
 553                         continue;
 554                 default: /* OBJ_TAG (nested tags) is already handled */
 555                         warning("Tag points to object of unexpected type %s, skipping.",
 556                                 typename(commit->object.type));
 557                         continue;
 558                 }
 559
 560                 /*
 561                  * This ref will not be updated through a commit, lets make
 562                  * sure it gets properly updated eventually.
 563                  */
 564                 if (commit->util || commit->object.flags & SHOWN)
 565                         string_list_append(&extra_refs, full_name)->util = commit;
 566                 if (!commit->util)
 567                         commit->util = full_name;
 568         }
 569 }
 570
 571 static void handle_tags_and_duplicates(void)
 572 {
 573         struct commit *commit;
 574         int i;
 575
 576         for (i = extra_refs.nr - 1; i >= 0; i--) {
 577                 const char *name = extra_refs.items[i].string;
 578                 struct object *object = extra_refs.items[i].util;
 579                 switch (object->type) {
 580                 case OBJ_TAG:
 581                         handle_tag(name, (struct tag *)object);
 582                         break;
 583                 case OBJ_COMMIT:
 584                         /* create refs pointing to already seen commits */
 585                         commit = (struct commit *)object;
 586                         printf("reset %s\nfrom :%d\n\n", name,
 587                                get_object_mark(&commit->object));
 588                         show_progress();
 589                         break;
 590                 }
 591         }
 592 }
 593
 594 static void export_marks(char *file)
 595 {
 596         unsigned int i;
 597         uint32_t mark;
 598         struct object_decoration *deco = idnums.hash;
 599         FILE *f;
 600         int e = 0;
 601
 602         f = fopen(file, "w");
 603         if (!f)
 604                 die_errno("Unable to open marks file %s for writing.", file);
 605
 606         for (i = 0; i < idnums.size; i++) {
 607                 if (deco->base && deco->base->type == 1) {
 608                         mark = ptr_to_mark(deco->decoration);
 609                         if (fprintf(f, ":%"PRIu32" %s\n", mark,
 610                                 sha1_to_hex(deco->base->sha1)) < 0) {
 611                             e = 1;
 612                             break;
 613                         }
 614                 }
 615                 deco++;
 616         }
 617
 618         e |= ferror(f);
 619         e |= fclose(f);
 620         if (e)
 621                 error("Unable to write marks file %s.", file);
 622 }
 623
 624 static void import_marks(char *input_file)
 625 {
 626         char line[512];
 627         FILE *f = fopen(input_file, "r");
 628         if (!f)
 629                 die_errno("cannot read '%s'", input_file);
 630
 631         while (fgets(line, sizeof(line), f)) {
 632                 uint32_t mark;
 633                 char *line_end, *mark_end;
 634                 unsigned char sha1[20];
 635                 struct object *object;
 636                 struct commit *commit;
 637                 enum object_type type;
 638
 639                 line_end = strchr(line, '\n');
 640                 if (line[0] != ':' || !line_end)
 641                         die("corrupt mark line: %s", line);
 642                 *line_end = '\0';
 643
 644                 mark = strtoumax(line + 1, &mark_end, 10);
 645                 if (!mark || mark_end == line + 1
 646                         || *mark_end != ' ' || get_sha1_hex(mark_end + 1, sha1))
 647                         die("corrupt mark line: %s", line);
 648
 649                 if (last_idnum < mark)
 650                         last_idnum = mark;
 651
 652                 type = sha1_object_info(sha1, NULL);
 653                 if (type < 0)
 654                         die("object not found: %s", sha1_to_hex(sha1));
 655
 656                 if (type != OBJ_COMMIT)
 657                         /* only commits */
 658                         continue;
 659
 660                 commit = lookup_commit(sha1);
 661                 if (!commit)
 662                         die("not a commit? can't happen: %s", sha1_to_hex(sha1));
 663
 664                 object = &commit->object;
 665
 666                 if (object->flags & SHOWN)
 667                         error("Object %s already has a mark", sha1_to_hex(sha1));
 668
 669                 mark_object(object, mark);
 670
 671                 object->flags |= SHOWN;
 672         }
 673         fclose(f);
 674 }
 675
 676 static void handle_deletes(void)
 677 {
 678         int i;
 679         for (i = 0; i < refspecs_nr; i++) {
 680                 struct refspec *refspec = &refspecs[i];
 681                 if (*refspec->src)
 682                         continue;
 683
 684                 printf("reset %s\nfrom %s\n\n",
 685                                 refspec->dst, sha1_to_hex(null_sha1));
 686         }
 687 }
 688
 689 int cmd_fast_export(int argc, const char **argv, const char *prefix)
 690 {
 691         struct rev_info revs;
 692         struct object_array commits = OBJECT_ARRAY_INIT;
 693         struct commit *commit;
 694         char *export_filename = NULL, *import_filename = NULL;
 695         uint32_t lastimportid;
 696         struct string_list refspecs_list = STRING_LIST_INIT_NODUP;
 697         struct option options[] = {
 698                 OPT_INTEGER(0, "progress", &progress,
 699                             N_("show progress after <n> objects")),
 700                 OPT_CALLBACK(0, "signed-tags", &signed_tag_mode, N_("mode"),
 701                              N_("select handling of signed tags"),
 702                              parse_opt_signed_tag_mode),
 703                 OPT_CALLBACK(0, "tag-of-filtered-object", &tag_of_filtered_mode, N_("mode"),
 704                              N_("select handling of tags that tag filtered objects"),
 705                              parse_opt_tag_of_filtered_mode),
 706                 OPT_STRING(0, "export-marks", &export_filename, N_("file"),
 707                              N_("Dump marks to this file")),
 708                 OPT_STRING(0, "import-marks", &import_filename, N_("file"),
 709                              N_("Import marks from this file")),
 710                 OPT_BOOL(0, "fake-missing-tagger", &fake_missing_tagger,
 711                          N_("Fake a tagger when tags lack one")),
 712                 OPT_BOOL(0, "full-tree", &full_tree,
 713                          N_("Output full tree for each commit")),
 714                 OPT_BOOL(0, "use-done-feature", &use_done_feature,
 715                              N_("Use the done feature to terminate the stream")),
 716                 OPT_BOOL(0, "no-data", &no_data, N_("Skip output of blob data")),
 717                 OPT_STRING_LIST(0, "refspec", &refspecs_list, N_("refspec"),
 718                              N_("Apply refspec to exported refs")),
 719                 OPT_END()
 720         };
 721
 722         if (argc == 1)
 723                 usage_with_options (fast_export_usage, options);
 724
 725         /* we handle encodings */
 726         git_config(git_default_config, NULL);
 727
 728         init_revisions(&revs, prefix);
 729         revs.topo_order = 1;
 730         revs.show_source = 1;
 731         revs.rewrite_parents = 1;
 732         argc = parse_options(argc, argv, prefix, options, fast_export_usage,
 733                         PARSE_OPT_KEEP_ARGV0 | PARSE_OPT_KEEP_UNKNOWN);
 734         argc = setup_revisions(argc, argv, &revs, NULL);
 735         if (argc > 1)
 736                 usage_with_options (fast_export_usage, options);
 737
 738         if (refspecs_list.nr) {
 739                 const char **refspecs_str;
 740                 int i;
 741
 742                 refspecs_str = xmalloc(sizeof(*refspecs_str) * refspecs_list.nr);
 743                 for (i = 0; i < refspecs_list.nr; i++)
 744                         refspecs_str[i] = refspecs_list.items[i].string;
 745
 746                 refspecs_nr = refspecs_list.nr;
 747                 refspecs = parse_fetch_refspec(refspecs_nr, refspecs_str);
 748
 749                 string_list_clear(&refspecs_list, 1);
 750                 free(refspecs_str);
 751         }
 752
 753         if (use_done_feature)
 754                 printf("feature done\n");
 755
 756         if (import_filename)
 757                 import_marks(import_filename);
 758         lastimportid = last_idnum;
 759
 760         if (import_filename && revs.prune_data.nr)
 761                 full_tree = 1;
 762
 763         get_tags_and_duplicates(&revs.cmdline);
 764
 765         if (prepare_revision_walk(&revs))
 766                 die("revision walk setup failed");
 767         revs.diffopt.format_callback = show_filemodify;
 768         DIFF_OPT_SET(&revs.diffopt, RECURSIVE);
 769         while ((commit = get_revision(&revs))) {
 770                 if (has_unshown_parent(commit)) {
 771                         add_object_array(&commit->object, NULL, &commits);
 772                 }
 773                 else {
 774                         handle_commit(commit, &revs);
 775                         handle_tail(&commits, &revs);
 776                 }
 777         }
 778
 779         handle_tags_and_duplicates();
 780         handle_deletes();
 781
 782         if (export_filename && lastimportid != last_idnum)
 783                 export_marks(export_filename);
 784
 785         if (use_done_feature)
 786                 printf("done\n");
 787
 788         free_refspec(refspecs_nr, refspecs);
 789
 790         return 0;
 791 }