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 *commit_buffer;
 286         const char *author, *author_end, *committer, *committer_end;
 287         const char *encoding, *message;
 288         char *reencoded = NULL;
 289         struct commit_list *p;
 290         int i;
 291
 292         rev->diffopt.output_format = DIFF_FORMAT_CALLBACK;
 293
 294         parse_commit_or_die(commit);
 295         commit_buffer = get_commit_buffer(commit, NULL);
 296         author = strstr(commit_buffer, "\nauthor ");
 297         if (!author)
 298                 die ("Could not find author in commit %s",
 299                      sha1_to_hex(commit->object.sha1));
 300         author++;
 301         author_end = strchrnul(author, '\n');
 302         committer = strstr(author_end, "\ncommitter ");
 303         if (!committer)
 304                 die ("Could not find committer in commit %s",
 305                      sha1_to_hex(commit->object.sha1));
 306         committer++;
 307         committer_end = strchrnul(committer, '\n');
 308         message = strstr(committer_end, "\n\n");
 309         encoding = find_encoding(committer_end, message);
 310         if (message)
 311                 message += 2;
 312
 313         if (commit->parents &&
 314             get_object_mark(&commit->parents->item->object) != 0 &&
 315             !full_tree) {
 316                 parse_commit_or_die(commit->parents->item);
 317                 diff_tree_sha1(commit->parents->item->tree->object.sha1,
 318                                commit->tree->object.sha1, "", &rev->diffopt);
 319         }
 320         else
 321                 diff_root_tree_sha1(commit->tree->object.sha1,
 322                                     "", &rev->diffopt);
 323
 324         /* Export the referenced blobs, and remember the marks. */
 325         for (i = 0; i < diff_queued_diff.nr; i++)
 326                 if (!S_ISGITLINK(diff_queued_diff.queue[i]->two->mode))
 327                         export_blob(diff_queued_diff.queue[i]->two->sha1);
 328
 329         mark_next_object(&commit->object);
 330         if (!is_encoding_utf8(encoding))
 331                 reencoded = reencode_string(message, "UTF-8", encoding);
 332         if (!commit->parents)
 333                 printf("reset %s\n", (const char*)commit->util);
 334         printf("commit %s\nmark :%"PRIu32"\n%.*s\n%.*s\ndata %u\n%s",
 335                (const char *)commit->util, last_idnum,
 336                (int)(author_end - author), author,
 337                (int)(committer_end - committer), committer,
 338                (unsigned)(reencoded
 339                           ? strlen(reencoded) : message
 340                           ? strlen(message) : 0),
 341                reencoded ? reencoded : message ? message : "");
 342         free(reencoded);
 343         unuse_commit_buffer(commit, commit_buffer);
 344
 345         for (i = 0, p = commit->parents; p; p = p->next) {
 346                 int mark = get_object_mark(&p->item->object);
 347                 if (!mark)
 348                         continue;
 349                 if (i == 0)
 350                         printf("from :%d\n", mark);
 351                 else
 352                         printf("merge :%d\n", mark);
 353                 i++;
 354         }
 355
 356         if (full_tree)
 357                 printf("deleteall\n");
 358         log_tree_diff_flush(rev);
 359         rev->diffopt.output_format = saved_output_format;
 360
 361         printf("\n");
 362
 363         show_progress();
 364 }
 365
 366 static void handle_tail(struct object_array *commits, struct rev_info *revs)
 367 {
 368         struct commit *commit;
 369         while (commits->nr) {
 370                 commit = (struct commit *)commits->objects[commits->nr - 1].item;
 371                 if (has_unshown_parent(commit))
 372                         return;
 373                 handle_commit(commit, revs);
 374                 commits->nr--;
 375         }
 376 }
 377
 378 static void handle_tag(const char *name, struct tag *tag)
 379 {
 380         unsigned long size;
 381         enum object_type type;
 382         char *buf;
 383         const char *tagger, *tagger_end, *message;
 384         size_t message_size = 0;
 385         struct object *tagged;
 386         int tagged_mark;
 387         struct commit *p;
 388
 389         /* Trees have no identifier in fast-export output, thus we have no way
 390          * to output tags of trees, tags of tags of trees, etc.  Simply omit
 391          * such tags.
 392          */
 393         tagged = tag->tagged;
 394         while (tagged->type == OBJ_TAG) {
 395                 tagged = ((struct tag *)tagged)->tagged;
 396         }
 397         if (tagged->type == OBJ_TREE) {
 398                 warning("Omitting tag %s,\nsince tags of trees (or tags of tags of trees, etc.) are not supported.",
 399                         sha1_to_hex(tag->object.sha1));
 400                 return;
 401         }
 402
 403         buf = read_sha1_file(tag->object.sha1, &type, &size);
 404         if (!buf)
 405                 die ("Could not read tag %s", sha1_to_hex(tag->object.sha1));
 406         message = memmem(buf, size, "\n\n", 2);
 407         if (message) {
 408                 message += 2;
 409                 message_size = strlen(message);
 410         }
 411         tagger = memmem(buf, message ? message - buf : size, "\ntagger ", 8);
 412         if (!tagger) {
 413                 if (fake_missing_tagger)
 414                         tagger = "tagger Unspecified Tagger "
 415                                 "<unspecified-tagger> 0 +0000";
 416                 else
 417                         tagger = "";
 418                 tagger_end = tagger + strlen(tagger);
 419         } else {
 420                 tagger++;
 421                 tagger_end = strchrnul(tagger, '\n');
 422         }
 423
 424         /* handle signed tags */
 425         if (message) {
 426                 const char *signature = strstr(message,
 427                                                "\n-----BEGIN PGP SIGNATURE-----\n");
 428                 if (signature)
 429                         switch(signed_tag_mode) {
 430                         case ABORT:
 431                                 die ("Encountered signed tag %s; use "
 432                                      "--signed-tags=<mode> to handle it.",
 433                                      sha1_to_hex(tag->object.sha1));
 434                         case WARN:
 435                                 warning ("Exporting signed tag %s",
 436                                          sha1_to_hex(tag->object.sha1));
 437                                 /* fallthru */
 438                         case VERBATIM:
 439                                 break;
 440                         case WARN_STRIP:
 441                                 warning ("Stripping signature from tag %s",
 442                                          sha1_to_hex(tag->object.sha1));
 443                                 /* fallthru */
 444                         case STRIP:
 445                                 message_size = signature + 1 - message;
 446                                 break;
 447                         }
 448         }
 449
 450         /* handle tag->tagged having been filtered out due to paths specified */
 451         tagged = tag->tagged;
 452         tagged_mark = get_object_mark(tagged);
 453         if (!tagged_mark) {
 454                 switch(tag_of_filtered_mode) {
 455                 case ABORT:
 456                         die ("Tag %s tags unexported object; use "
 457                              "--tag-of-filtered-object=<mode> to handle it.",
 458                              sha1_to_hex(tag->object.sha1));
 459                 case DROP:
 460                         /* Ignore this tag altogether */
 461                         return;
 462                 case REWRITE:
 463                         if (tagged->type != OBJ_COMMIT) {
 464                                 die ("Tag %s tags unexported %s!",
 465                                      sha1_to_hex(tag->object.sha1),
 466                                      typename(tagged->type));
 467                         }
 468                         p = (struct commit *)tagged;
 469                         for (;;) {
 470                                 if (p->parents && p->parents->next)
 471                                         break;
 472                                 if (p->object.flags & UNINTERESTING)
 473                                         break;
 474                                 if (!(p->object.flags & TREESAME))
 475                                         break;
 476                                 if (!p->parents)
 477                                         die ("Can't find replacement commit for tag %s\n",
 478                                              sha1_to_hex(tag->object.sha1));
 479                                 p = p->parents->item;
 480                         }
 481                         tagged_mark = get_object_mark(&p->object);
 482                 }
 483         }
 484
 485         if (starts_with(name, "refs/tags/"))
 486                 name += 10;
 487         printf("tag %s\nfrom :%d\n%.*s%sdata %d\n%.*s\n",
 488                name, tagged_mark,
 489                (int)(tagger_end - tagger), tagger,
 490                tagger == tagger_end ? "" : "\n",
 491                (int)message_size, (int)message_size, message ? message : "");
 492 }
 493
 494 static struct commit *get_commit(struct rev_cmdline_entry *e, char *full_name)
 495 {
 496         switch (e->item->type) {
 497         case OBJ_COMMIT:
 498                 return (struct commit *)e->item;
 499         case OBJ_TAG: {
 500                 struct tag *tag = (struct tag *)e->item;
 501
 502                 /* handle nested tags */
 503                 while (tag && tag->object.type == OBJ_TAG) {
 504                         parse_object(tag->object.sha1);
 505                         string_list_append(&extra_refs, full_name)->util = tag;
 506                         tag = (struct tag *)tag->tagged;
 507                 }
 508                 if (!tag)
 509                         die("Tag %s points nowhere?", e->name);
 510                 return (struct commit *)tag;
 511                 break;
 512         }
 513         default:
 514                 return NULL;
 515         }
 516 }
 517
 518 static void get_tags_and_duplicates(struct rev_cmdline_info *info)
 519 {
 520         int i;
 521
 522         for (i = 0; i < info->nr; i++) {
 523                 struct rev_cmdline_entry *e = info->rev + i;
 524                 unsigned char sha1[20];
 525                 struct commit *commit;
 526                 char *full_name;
 527
 528                 if (e->flags & UNINTERESTING)
 529                         continue;
 530
 531                 if (dwim_ref(e->name, strlen(e->name), sha1, &full_name) != 1)
 532                         continue;
 533
 534                 if (refspecs) {
 535                         char *private;
 536                         private = apply_refspecs(refspecs, refspecs_nr, full_name);
 537                         if (private) {
 538                                 free(full_name);
 539                                 full_name = private;
 540                         }
 541                 }
 542
 543                 commit = get_commit(e, full_name);
 544                 if (!commit) {
 545                         warning("%s: Unexpected object of type %s, skipping.",
 546                                 e->name,
 547                                 typename(e->item->type));
 548                         continue;
 549                 }
 550
 551                 switch(commit->object.type) {
 552                 case OBJ_COMMIT:
 553                         break;
 554                 case OBJ_BLOB:
 555                         export_blob(commit->object.sha1);
 556                         continue;
 557                 default: /* OBJ_TAG (nested tags) is already handled */
 558                         warning("Tag points to object of unexpected type %s, skipping.",
 559                                 typename(commit->object.type));
 560                         continue;
 561                 }
 562
 563                 /*
 564                  * This ref will not be updated through a commit, lets make
 565                  * sure it gets properly updated eventually.
 566                  */
 567                 if (commit->util || commit->object.flags & SHOWN)
 568                         string_list_append(&extra_refs, full_name)->util = commit;
 569                 if (!commit->util)
 570                         commit->util = full_name;
 571         }
 572 }
 573
 574 static void handle_reset(const char *name, struct object *object)
 575 {
 576         int mark = get_object_mark(object);
 577
 578         if (mark)
 579                 printf("reset %s\nfrom :%d\n\n", name,
 580                        get_object_mark(object));
 581         else
 582                 printf("reset %s\nfrom %s\n\n", name,
 583                        sha1_to_hex(object->sha1));
 584 }
 585
 586 static void handle_tags_and_duplicates(void)
 587 {
 588         int i;
 589
 590         for (i = extra_refs.nr - 1; i >= 0; i--) {
 591                 const char *name = extra_refs.items[i].string;
 592                 struct object *object = extra_refs.items[i].util;
 593                 switch (object->type) {
 594                 case OBJ_TAG:
 595                         handle_tag(name, (struct tag *)object);
 596                         break;
 597                 case OBJ_COMMIT:
 598                         /* create refs pointing to already seen commits */
 599                         handle_reset(name, object);
 600                         show_progress();
 601                         break;
 602                 }
 603         }
 604 }
 605
 606 static void export_marks(char *file)
 607 {
 608         unsigned int i;
 609         uint32_t mark;
 610         struct object_decoration *deco = idnums.hash;
 611         FILE *f;
 612         int e = 0;
 613
 614         f = fopen(file, "w");
 615         if (!f)
 616                 die_errno("Unable to open marks file %s for writing.", file);
 617
 618         for (i = 0; i < idnums.size; i++) {
 619                 if (deco->base && deco->base->type == 1) {
 620                         mark = ptr_to_mark(deco->decoration);
 621                         if (fprintf(f, ":%"PRIu32" %s\n", mark,
 622                                 sha1_to_hex(deco->base->sha1)) < 0) {
 623                             e = 1;
 624                             break;
 625                         }
 626                 }
 627                 deco++;
 628         }
 629
 630         e |= ferror(f);
 631         e |= fclose(f);
 632         if (e)
 633                 error("Unable to write marks file %s.", file);
 634 }
 635
 636 static void import_marks(char *input_file)
 637 {
 638         char line[512];
 639         FILE *f = fopen(input_file, "r");
 640         if (!f)
 641                 die_errno("cannot read '%s'", input_file);
 642
 643         while (fgets(line, sizeof(line), f)) {
 644                 uint32_t mark;
 645                 char *line_end, *mark_end;
 646                 unsigned char sha1[20];
 647                 struct object *object;
 648                 struct commit *commit;
 649                 enum object_type type;
 650
 651                 line_end = strchr(line, '\n');
 652                 if (line[0] != ':' || !line_end)
 653                         die("corrupt mark line: %s", line);
 654                 *line_end = '\0';
 655
 656                 mark = strtoumax(line + 1, &mark_end, 10);
 657                 if (!mark || mark_end == line + 1
 658                         || *mark_end != ' ' || get_sha1_hex(mark_end + 1, sha1))
 659                         die("corrupt mark line: %s", line);
 660
 661                 if (last_idnum < mark)
 662                         last_idnum = mark;
 663
 664                 type = sha1_object_info(sha1, NULL);
 665                 if (type < 0)
 666                         die("object not found: %s", sha1_to_hex(sha1));
 667
 668                 if (type != OBJ_COMMIT)
 669                         /* only commits */
 670                         continue;
 671
 672                 commit = lookup_commit(sha1);
 673                 if (!commit)
 674                         die("not a commit? can't happen: %s", sha1_to_hex(sha1));
 675
 676                 object = &commit->object;
 677
 678                 if (object->flags & SHOWN)
 679                         error("Object %s already has a mark", sha1_to_hex(sha1));
 680
 681                 mark_object(object, mark);
 682
 683                 object->flags |= SHOWN;
 684         }
 685         fclose(f);
 686 }
 687
 688 static void handle_deletes(void)
 689 {
 690         int i;
 691         for (i = 0; i < refspecs_nr; i++) {
 692                 struct refspec *refspec = &refspecs[i];
 693                 if (*refspec->src)
 694                         continue;
 695
 696                 printf("reset %s\nfrom %s\n\n",
 697                                 refspec->dst, sha1_to_hex(null_sha1));
 698         }
 699 }
 700
 701 int cmd_fast_export(int argc, const char **argv, const char *prefix)
 702 {
 703         struct rev_info revs;
 704         struct object_array commits = OBJECT_ARRAY_INIT;
 705         struct commit *commit;
 706         char *export_filename = NULL, *import_filename = NULL;
 707         uint32_t lastimportid;
 708         struct string_list refspecs_list = STRING_LIST_INIT_NODUP;
 709         struct option options[] = {
 710                 OPT_INTEGER(0, "progress", &progress,
 711                             N_("show progress after <n> objects")),
 712                 OPT_CALLBACK(0, "signed-tags", &signed_tag_mode, N_("mode"),
 713                              N_("select handling of signed tags"),
 714                              parse_opt_signed_tag_mode),
 715                 OPT_CALLBACK(0, "tag-of-filtered-object", &tag_of_filtered_mode, N_("mode"),
 716                              N_("select handling of tags that tag filtered objects"),
 717                              parse_opt_tag_of_filtered_mode),
 718                 OPT_STRING(0, "export-marks", &export_filename, N_("file"),
 719                              N_("Dump marks to this file")),
 720                 OPT_STRING(0, "import-marks", &import_filename, N_("file"),
 721                              N_("Import marks from this file")),
 722                 OPT_BOOL(0, "fake-missing-tagger", &fake_missing_tagger,
 723                          N_("Fake a tagger when tags lack one")),
 724                 OPT_BOOL(0, "full-tree", &full_tree,
 725                          N_("Output full tree for each commit")),
 726                 OPT_BOOL(0, "use-done-feature", &use_done_feature,
 727                              N_("Use the done feature to terminate the stream")),
 728                 OPT_BOOL(0, "no-data", &no_data, N_("Skip output of blob data")),
 729                 OPT_STRING_LIST(0, "refspec", &refspecs_list, N_("refspec"),
 730                              N_("Apply refspec to exported refs")),
 731                 OPT_END()
 732         };
 733
 734         if (argc == 1)
 735                 usage_with_options (fast_export_usage, options);
 736
 737         /* we handle encodings */
 738         git_config(git_default_config, NULL);
 739
 740         init_revisions(&revs, prefix);
 741         revs.topo_order = 1;
 742         revs.show_source = 1;
 743         revs.rewrite_parents = 1;
 744         argc = parse_options(argc, argv, prefix, options, fast_export_usage,
 745                         PARSE_OPT_KEEP_ARGV0 | PARSE_OPT_KEEP_UNKNOWN);
 746         argc = setup_revisions(argc, argv, &revs, NULL);
 747         if (argc > 1)
 748                 usage_with_options (fast_export_usage, options);
 749
 750         if (refspecs_list.nr) {
 751                 const char **refspecs_str;
 752                 int i;
 753
 754                 refspecs_str = xmalloc(sizeof(*refspecs_str) * refspecs_list.nr);
 755                 for (i = 0; i < refspecs_list.nr; i++)
 756                         refspecs_str[i] = refspecs_list.items[i].string;
 757
 758                 refspecs_nr = refspecs_list.nr;
 759                 refspecs = parse_fetch_refspec(refspecs_nr, refspecs_str);
 760
 761                 string_list_clear(&refspecs_list, 1);
 762                 free(refspecs_str);
 763         }
 764
 765         if (use_done_feature)
 766                 printf("feature done\n");
 767
 768         if (import_filename)
 769                 import_marks(import_filename);
 770         lastimportid = last_idnum;
 771
 772         if (import_filename && revs.prune_data.nr)
 773                 full_tree = 1;
 774
 775         get_tags_and_duplicates(&revs.cmdline);
 776
 777         if (prepare_revision_walk(&revs))
 778                 die("revision walk setup failed");
 779         revs.diffopt.format_callback = show_filemodify;
 780         DIFF_OPT_SET(&revs.diffopt, RECURSIVE);
 781         while ((commit = get_revision(&revs))) {
 782                 if (has_unshown_parent(commit)) {
 783                         add_object_array(&commit->object, NULL, &commits);
 784                 }
 785                 else {
 786                         handle_commit(commit, &revs);
 787                         handle_tail(&commits, &revs);
 788                 }
 789         }
 790
 791         handle_tags_and_duplicates();
 792         handle_deletes();
 793
 794         if (export_filename && lastimportid != last_idnum)
 795                 export_marks(export_filename);
 796
 797         if (use_done_feature)
 798                 printf("done\n");
 799
 800         free_refspec(refspecs_nr, refspecs);
 801
 802         return 0;
 803 }