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, WARN_STRIP, 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, "warn-strip"))
  44                 signed_tag_mode = WARN_STRIP;
  45         else if (!strcmp(arg, "strip"))
  46                 signed_tag_mode = STRIP;
  47         else
  48                 return error("Unknown signed-tags mode: %s", arg);
  49         return 0;
  50 }
  51
  52 static int parse_opt_tag_of_filtered_mode(const struct option *opt,
  53                                           const char *arg, int unset)
  54 {
  55         if (unset || !strcmp(arg, "abort"))
  56                 tag_of_filtered_mode = ERROR;
  57         else if (!strcmp(arg, "drop"))
  58                 tag_of_filtered_mode = DROP;
  59         else if (!strcmp(arg, "rewrite"))
  60                 tag_of_filtered_mode = REWRITE;
  61         else
  62                 return error("Unknown tag-of-filtered mode: %s", arg);
  63         return 0;
  64 }
  65
  66 static struct decoration idnums;
  67 static uint32_t last_idnum;
  68
  69 static int has_unshown_parent(struct commit *commit)
  70 {
  71         struct commit_list *parent;
  72
  73         for (parent = commit->parents; parent; parent = parent->next)
  74                 if (!(parent->item->object.flags & SHOWN) &&
  75                     !(parent->item->object.flags & UNINTERESTING))
  76                         return 1;
  77         return 0;
  78 }
  79
  80 /* Since intptr_t is C99, we do not use it here */
  81 static inline uint32_t *mark_to_ptr(uint32_t mark)
  82 {
  83         return ((uint32_t *)NULL) + mark;
  84 }
  85
  86 static inline uint32_t ptr_to_mark(void * mark)
  87 {
  88         return (uint32_t *)mark - (uint32_t *)NULL;
  89 }
  90
  91 static inline void mark_object(struct object *object, uint32_t mark)
  92 {
  93         add_decoration(&idnums, object, mark_to_ptr(mark));
  94 }
  95
  96 static inline void mark_next_object(struct object *object)
  97 {
  98         mark_object(object, ++last_idnum);
  99 }
 100
 101 static int get_object_mark(struct object *object)
 102 {
 103         void *decoration = lookup_decoration(&idnums, object);
 104         if (!decoration)
 105                 return 0;
 106         return ptr_to_mark(decoration);
 107 }
 108
 109 static void show_progress(void)
 110 {
 111         static int counter = 0;
 112         if (!progress)
 113                 return;
 114         if ((++counter % progress) == 0)
 115                 printf("progress %d objects\n", counter);
 116 }
 117
 118 static void export_blob(const unsigned char *sha1)
 119 {
 120         unsigned long size;
 121         enum object_type type;
 122         char *buf;
 123         struct object *object;
 124         int eaten;
 125
 126         if (no_data)
 127                 return;
 128
 129         if (is_null_sha1(sha1))
 130                 return;
 131
 132         object = lookup_object(sha1);
 133         if (object && object->flags & SHOWN)
 134                 return;
 135
 136         buf = read_sha1_file(sha1, &type, &size);
 137         if (!buf)
 138                 die ("Could not read blob %s", sha1_to_hex(sha1));
 139         if (check_sha1_signature(sha1, buf, size, typename(type)) < 0)
 140                 die("sha1 mismatch in blob %s", sha1_to_hex(sha1));
 141         object = parse_object_buffer(sha1, type, size, buf, &eaten);
 142         if (!object)
 143                 die("Could not read blob %s", sha1_to_hex(sha1));
 144
 145         mark_next_object(object);
 146
 147         printf("blob\nmark :%"PRIu32"\ndata %lu\n", last_idnum, size);
 148         if (size && fwrite(buf, size, 1, stdout) != 1)
 149                 die_errno ("Could not write blob '%s'", sha1_to_hex(sha1));
 150         printf("\n");
 151
 152         show_progress();
 153
 154         object->flags |= SHOWN;
 155         if (!eaten)
 156                 free(buf);
 157 }
 158
 159 static int depth_first(const void *a_, const void *b_)
 160 {
 161         const struct diff_filepair *a = *((const struct diff_filepair **)a_);
 162         const struct diff_filepair *b = *((const struct diff_filepair **)b_);
 163         const char *name_a, *name_b;
 164         int len_a, len_b, len;
 165         int cmp;
 166
 167         name_a = a->one ? a->one->path : a->two->path;
 168         name_b = b->one ? b->one->path : b->two->path;
 169
 170         len_a = strlen(name_a);
 171         len_b = strlen(name_b);
 172         len = (len_a < len_b) ? len_a : len_b;
 173
 174         /* strcmp will sort 'd' before 'd/e', we want 'd/e' before 'd' */
 175         cmp = memcmp(name_a, name_b, len);
 176         if (cmp)
 177                 return cmp;
 178         cmp = len_b - len_a;
 179         if (cmp)
 180                 return cmp;
 181         /*
 182          * Move 'R'ename entries last so that all references of the file
 183          * appear in the output before it is renamed (e.g., when a file
 184          * was copied and renamed in the same commit).
 185          */
 186         return (a->status == 'R') - (b->status == 'R');
 187 }
 188
 189 static void print_path(const char *path)
 190 {
 191         int need_quote = quote_c_style(path, NULL, NULL, 0);
 192         if (need_quote)
 193                 quote_c_style(path, NULL, stdout, 0);
 194         else if (strchr(path, ' '))
 195                 printf("\"%s\"", path);
 196         else
 197                 printf("%s", path);
 198 }
 199
 200 static void show_filemodify(struct diff_queue_struct *q,
 201                             struct diff_options *options, void *data)
 202 {
 203         int i;
 204
 205         /*
 206          * Handle files below a directory first, in case they are all deleted
 207          * and the directory changes to a file or symlink.
 208          */
 209         qsort(q->queue, q->nr, sizeof(q->queue[0]), depth_first);
 210
 211         for (i = 0; i < q->nr; i++) {
 212                 struct diff_filespec *ospec = q->queue[i]->one;
 213                 struct diff_filespec *spec = q->queue[i]->two;
 214
 215                 switch (q->queue[i]->status) {
 216                 case DIFF_STATUS_DELETED:
 217                         printf("D ");
 218                         print_path(spec->path);
 219                         putchar('\n');
 220                         break;
 221
 222                 case DIFF_STATUS_COPIED:
 223                 case DIFF_STATUS_RENAMED:
 224                         printf("%c ", q->queue[i]->status);
 225                         print_path(ospec->path);
 226                         putchar(' ');
 227                         print_path(spec->path);
 228                         putchar('\n');
 229
 230                         if (!hashcmp(ospec->sha1, spec->sha1) &&
 231                             ospec->mode == spec->mode)
 232                                 break;
 233                         /* fallthrough */
 234
 235                 case DIFF_STATUS_TYPE_CHANGED:
 236                 case DIFF_STATUS_MODIFIED:
 237                 case DIFF_STATUS_ADDED:
 238                         /*
 239                          * Links refer to objects in another repositories;
 240                          * output the SHA-1 verbatim.
 241                          */
 242                         if (no_data || S_ISGITLINK(spec->mode))
 243                                 printf("M %06o %s ", spec->mode,
 244                                        sha1_to_hex(spec->sha1));
 245                         else {
 246                                 struct object *object = lookup_object(spec->sha1);
 247                                 printf("M %06o :%d ", spec->mode,
 248                                        get_object_mark(object));
 249                         }
 250                         print_path(spec->path);
 251                         putchar('\n');
 252                         break;
 253
 254                 default:
 255                         die("Unexpected comparison status '%c' for %s, %s",
 256                                 q->queue[i]->status,
 257                                 ospec->path ? ospec->path : "none",
 258                                 spec->path ? spec->path : "none");
 259                 }
 260         }
 261 }
 262
 263 static const char *find_encoding(const char *begin, const char *end)
 264 {
 265         const char *needle = "\nencoding ";
 266         char *bol, *eol;
 267
 268         bol = memmem(begin, end ? end - begin : strlen(begin),
 269                      needle, strlen(needle));
 270         if (!bol)
 271                 return git_commit_encoding;
 272         bol += strlen(needle);
 273         eol = strchrnul(bol, '\n');
 274         *eol = '\0';
 275         return bol;
 276 }
 277
 278 static void handle_commit(struct commit *commit, struct rev_info *rev)
 279 {
 280         int saved_output_format = rev->diffopt.output_format;
 281         const char *author, *author_end, *committer, *committer_end;
 282         const char *encoding, *message;
 283         char *reencoded = NULL;
 284         struct commit_list *p;
 285         int i;
 286
 287         rev->diffopt.output_format = DIFF_FORMAT_CALLBACK;
 288
 289         parse_commit(commit);
 290         author = strstr(commit->buffer, "\nauthor ");
 291         if (!author)
 292                 die ("Could not find author in commit %s",
 293                      sha1_to_hex(commit->object.sha1));
 294         author++;
 295         author_end = strchrnul(author, '\n');
 296         committer = strstr(author_end, "\ncommitter ");
 297         if (!committer)
 298                 die ("Could not find committer in commit %s",
 299                      sha1_to_hex(commit->object.sha1));
 300         committer++;
 301         committer_end = strchrnul(committer, '\n');
 302         message = strstr(committer_end, "\n\n");
 303         encoding = find_encoding(committer_end, message);
 304         if (message)
 305                 message += 2;
 306
 307         if (commit->parents &&
 308             get_object_mark(&commit->parents->item->object) != 0 &&
 309             !full_tree) {
 310                 parse_commit(commit->parents->item);
 311                 diff_tree_sha1(commit->parents->item->tree->object.sha1,
 312                                commit->tree->object.sha1, "", &rev->diffopt);
 313         }
 314         else
 315                 diff_root_tree_sha1(commit->tree->object.sha1,
 316                                     "", &rev->diffopt);
 317
 318         /* Export the referenced blobs, and remember the marks. */
 319         for (i = 0; i < diff_queued_diff.nr; i++)
 320                 if (!S_ISGITLINK(diff_queued_diff.queue[i]->two->mode))
 321                         export_blob(diff_queued_diff.queue[i]->two->sha1);
 322
 323         mark_next_object(&commit->object);
 324         if (!is_encoding_utf8(encoding))
 325                 reencoded = reencode_string(message, "UTF-8", encoding);
 326         if (!commit->parents)
 327                 printf("reset %s\n", (const char*)commit->util);
 328         printf("commit %s\nmark :%"PRIu32"\n%.*s\n%.*s\ndata %u\n%s",
 329                (const char *)commit->util, last_idnum,
 330                (int)(author_end - author), author,
 331                (int)(committer_end - committer), committer,
 332                (unsigned)(reencoded
 333                           ? strlen(reencoded) : message
 334                           ? strlen(message) : 0),
 335                reencoded ? reencoded : message ? message : "");
 336         free(reencoded);
 337
 338         for (i = 0, p = commit->parents; p; p = p->next) {
 339                 int mark = get_object_mark(&p->item->object);
 340                 if (!mark)
 341                         continue;
 342                 if (i == 0)
 343                         printf("from :%d\n", mark);
 344                 else
 345                         printf("merge :%d\n", mark);
 346                 i++;
 347         }
 348
 349         if (full_tree)
 350                 printf("deleteall\n");
 351         log_tree_diff_flush(rev);
 352         rev->diffopt.output_format = saved_output_format;
 353
 354         printf("\n");
 355
 356         show_progress();
 357 }
 358
 359 static void handle_tail(struct object_array *commits, struct rev_info *revs)
 360 {
 361         struct commit *commit;
 362         while (commits->nr) {
 363                 commit = (struct commit *)commits->objects[commits->nr - 1].item;
 364                 if (has_unshown_parent(commit))
 365                         return;
 366                 handle_commit(commit, revs);
 367                 commits->nr--;
 368         }
 369 }
 370
 371 static void handle_tag(const char *name, struct tag *tag)
 372 {
 373         unsigned long size;
 374         enum object_type type;
 375         char *buf;
 376         const char *tagger, *tagger_end, *message;
 377         size_t message_size = 0;
 378         struct object *tagged;
 379         int tagged_mark;
 380         struct commit *p;
 381
 382         /* Trees have no identifer in fast-export output, thus we have no way
 383          * to output tags of trees, tags of tags of trees, etc.  Simply omit
 384          * such tags.
 385          */
 386         tagged = tag->tagged;
 387         while (tagged->type == OBJ_TAG) {
 388                 tagged = ((struct tag *)tagged)->tagged;
 389         }
 390         if (tagged->type == OBJ_TREE) {
 391                 warning("Omitting tag %s,\nsince tags of trees (or tags of tags of trees, etc.) are not supported.",
 392                         sha1_to_hex(tag->object.sha1));
 393                 return;
 394         }
 395
 396         buf = read_sha1_file(tag->object.sha1, &type, &size);
 397         if (!buf)
 398                 die ("Could not read tag %s", sha1_to_hex(tag->object.sha1));
 399         message = memmem(buf, size, "\n\n", 2);
 400         if (message) {
 401                 message += 2;
 402                 message_size = strlen(message);
 403         }
 404         tagger = memmem(buf, message ? message - buf : size, "\ntagger ", 8);
 405         if (!tagger) {
 406                 if (fake_missing_tagger)
 407                         tagger = "tagger Unspecified Tagger "
 408                                 "<unspecified-tagger> 0 +0000";
 409                 else
 410                         tagger = "";
 411                 tagger_end = tagger + strlen(tagger);
 412         } else {
 413                 tagger++;
 414                 tagger_end = strchrnul(tagger, '\n');
 415         }
 416
 417         /* handle signed tags */
 418         if (message) {
 419                 const char *signature = strstr(message,
 420                                                "\n-----BEGIN PGP SIGNATURE-----\n");
 421                 if (signature)
 422                         switch(signed_tag_mode) {
 423                         case ABORT:
 424                                 die ("Encountered signed tag %s; use "
 425                                      "--signed-tags=<mode> to handle it.",
 426                                      sha1_to_hex(tag->object.sha1));
 427                         case WARN:
 428                                 warning ("Exporting signed tag %s",
 429                                          sha1_to_hex(tag->object.sha1));
 430                                 /* fallthru */
 431                         case VERBATIM:
 432                                 break;
 433                         case WARN_STRIP:
 434                                 warning ("Stripping signature from tag %s",
 435                                          sha1_to_hex(tag->object.sha1));
 436                                 /* fallthru */
 437                         case STRIP:
 438                                 message_size = signature + 1 - message;
 439                                 break;
 440                         }
 441         }
 442
 443         /* handle tag->tagged having been filtered out due to paths specified */
 444         tagged = tag->tagged;
 445         tagged_mark = get_object_mark(tagged);
 446         if (!tagged_mark) {
 447                 switch(tag_of_filtered_mode) {
 448                 case ABORT:
 449                         die ("Tag %s tags unexported object; use "
 450                              "--tag-of-filtered-object=<mode> to handle it.",
 451                              sha1_to_hex(tag->object.sha1));
 452                 case DROP:
 453                         /* Ignore this tag altogether */
 454                         return;
 455                 case REWRITE:
 456                         if (tagged->type != OBJ_COMMIT) {
 457                                 die ("Tag %s tags unexported %s!",
 458                                      sha1_to_hex(tag->object.sha1),
 459                                      typename(tagged->type));
 460                         }
 461                         p = (struct commit *)tagged;
 462                         for (;;) {
 463                                 if (p->parents && p->parents->next)
 464                                         break;
 465                                 if (p->object.flags & UNINTERESTING)
 466                                         break;
 467                                 if (!(p->object.flags & TREESAME))
 468                                         break;
 469                                 if (!p->parents)
 470                                         die ("Can't find replacement commit for tag %s\n",
 471                                              sha1_to_hex(tag->object.sha1));
 472                                 p = p->parents->item;
 473                         }
 474                         tagged_mark = get_object_mark(&p->object);
 475                 }
 476         }
 477
 478         if (!prefixcmp(name, "refs/tags/"))
 479                 name += 10;
 480         printf("tag %s\nfrom :%d\n%.*s%sdata %d\n%.*s\n",
 481                name, tagged_mark,
 482                (int)(tagger_end - tagger), tagger,
 483                tagger == tagger_end ? "" : "\n",
 484                (int)message_size, (int)message_size, message ? message : "");
 485 }
 486
 487 static void get_tags_and_duplicates(struct rev_cmdline_info *info,
 488                                     struct string_list *extra_refs)
 489 {
 490         struct tag *tag;
 491         int i;
 492
 493         for (i = 0; i < info->nr; i++) {
 494                 struct rev_cmdline_entry *e = info->rev + i;
 495                 unsigned char sha1[20];
 496                 struct commit *commit;
 497                 char *full_name;
 498
 499                 if (e->flags & UNINTERESTING)
 500                         continue;
 501
 502                 if (dwim_ref(e->name, strlen(e->name), sha1, &full_name) != 1)
 503                         continue;
 504
 505                 switch (e->item->type) {
 506                 case OBJ_COMMIT:
 507                         commit = (struct commit *)e->item;
 508                         break;
 509                 case OBJ_TAG:
 510                         tag = (struct tag *)e->item;
 511
 512                         /* handle nested tags */
 513                         while (tag && tag->object.type == OBJ_TAG) {
 514                                 parse_object(tag->object.sha1);
 515                                 string_list_append(extra_refs, full_name)->util = tag;
 516                                 tag = (struct tag *)tag->tagged;
 517                         }
 518                         if (!tag)
 519                                 die ("Tag %s points nowhere?", e->name);
 520                         switch(tag->object.type) {
 521                         case OBJ_COMMIT:
 522                                 commit = (struct commit *)tag;
 523                                 break;
 524                         case OBJ_BLOB:
 525                                 export_blob(tag->object.sha1);
 526                                 continue;
 527                         default: /* OBJ_TAG (nested tags) is already handled */
 528                                 warning("Tag points to object of unexpected type %s, skipping.",
 529                                         typename(tag->object.type));
 530                                 continue;
 531                         }
 532                         break;
 533                 default:
 534                         warning("%s: Unexpected object of type %s, skipping.",
 535                                 e->name,
 536                                 typename(e->item->type));
 537                         continue;
 538                 }
 539
 540                 /*
 541                  * This ref will not be updated through a commit, lets make
 542                  * sure it gets properly updated eventually.
 543                  */
 544                 if (commit->util || commit->object.flags & SHOWN)
 545                         string_list_append(extra_refs, full_name)->util = commit;
 546                 if (!commit->util)
 547                         commit->util = full_name;
 548         }
 549 }
 550
 551 static void handle_tags_and_duplicates(struct string_list *extra_refs)
 552 {
 553         struct commit *commit;
 554         int i;
 555
 556         for (i = extra_refs->nr - 1; i >= 0; i--) {
 557                 const char *name = extra_refs->items[i].string;
 558                 struct object *object = extra_refs->items[i].util;
 559                 switch (object->type) {
 560                 case OBJ_TAG:
 561                         handle_tag(name, (struct tag *)object);
 562                         break;
 563                 case OBJ_COMMIT:
 564                         /* create refs pointing to already seen commits */
 565                         commit = (struct commit *)object;
 566                         printf("reset %s\nfrom :%d\n\n", name,
 567                                get_object_mark(&commit->object));
 568                         show_progress();
 569                         break;
 570                 }
 571         }
 572 }
 573
 574 static void export_marks(char *file)
 575 {
 576         unsigned int i;
 577         uint32_t mark;
 578         struct object_decoration *deco = idnums.hash;
 579         FILE *f;
 580         int e = 0;
 581
 582         f = fopen(file, "w");
 583         if (!f)
 584                 die_errno("Unable to open marks file %s for writing.", file);
 585
 586         for (i = 0; i < idnums.size; i++) {
 587                 if (deco->base && deco->base->type == 1) {
 588                         mark = ptr_to_mark(deco->decoration);
 589                         if (fprintf(f, ":%"PRIu32" %s\n", mark,
 590                                 sha1_to_hex(deco->base->sha1)) < 0) {
 591                             e = 1;
 592                             break;
 593                         }
 594                 }
 595                 deco++;
 596         }
 597
 598         e |= ferror(f);
 599         e |= fclose(f);
 600         if (e)
 601                 error("Unable to write marks file %s.", file);
 602 }
 603
 604 static void import_marks(char *input_file)
 605 {
 606         char line[512];
 607         FILE *f = fopen(input_file, "r");
 608         if (!f)
 609                 die_errno("cannot read '%s'", input_file);
 610
 611         while (fgets(line, sizeof(line), f)) {
 612                 uint32_t mark;
 613                 char *line_end, *mark_end;
 614                 unsigned char sha1[20];
 615                 struct object *object;
 616                 struct commit *commit;
 617                 enum object_type type;
 618
 619                 line_end = strchr(line, '\n');
 620                 if (line[0] != ':' || !line_end)
 621                         die("corrupt mark line: %s", line);
 622                 *line_end = '\0';
 623
 624                 mark = strtoumax(line + 1, &mark_end, 10);
 625                 if (!mark || mark_end == line + 1
 626                         || *mark_end != ' ' || get_sha1_hex(mark_end + 1, sha1))
 627                         die("corrupt mark line: %s", line);
 628
 629                 if (last_idnum < mark)
 630                         last_idnum = mark;
 631
 632                 type = sha1_object_info(sha1, NULL);
 633                 if (type < 0)
 634                         die("object not found: %s", sha1_to_hex(sha1));
 635
 636                 if (type != OBJ_COMMIT)
 637                         /* only commits */
 638                         continue;
 639
 640                 commit = lookup_commit(sha1);
 641                 if (!commit)
 642                         die("not a commit? can't happen: %s", sha1_to_hex(sha1));
 643
 644                 object = &commit->object;
 645
 646                 if (object->flags & SHOWN)
 647                         error("Object %s already has a mark", sha1_to_hex(sha1));
 648
 649                 mark_object(object, mark);
 650
 651                 object->flags |= SHOWN;
 652         }
 653         fclose(f);
 654 }
 655
 656 int cmd_fast_export(int argc, const char **argv, const char *prefix)
 657 {
 658         struct rev_info revs;
 659         struct object_array commits = OBJECT_ARRAY_INIT;
 660         struct string_list extra_refs = STRING_LIST_INIT_NODUP;
 661         struct commit *commit;
 662         char *export_filename = NULL, *import_filename = NULL;
 663         uint32_t lastimportid;
 664         struct option options[] = {
 665                 OPT_INTEGER(0, "progress", &progress,
 666                             N_("show progress after <n> objects")),
 667                 OPT_CALLBACK(0, "signed-tags", &signed_tag_mode, N_("mode"),
 668                              N_("select handling of signed tags"),
 669                              parse_opt_signed_tag_mode),
 670                 OPT_CALLBACK(0, "tag-of-filtered-object", &tag_of_filtered_mode, N_("mode"),
 671                              N_("select handling of tags that tag filtered objects"),
 672                              parse_opt_tag_of_filtered_mode),
 673                 OPT_STRING(0, "export-marks", &export_filename, N_("file"),
 674                              N_("Dump marks to this file")),
 675                 OPT_STRING(0, "import-marks", &import_filename, N_("file"),
 676                              N_("Import marks from this file")),
 677                 OPT_BOOLEAN(0, "fake-missing-tagger", &fake_missing_tagger,
 678                              N_("Fake a tagger when tags lack one")),
 679                 OPT_BOOLEAN(0, "full-tree", &full_tree,
 680                              N_("Output full tree for each commit")),
 681                 OPT_BOOLEAN(0, "use-done-feature", &use_done_feature,
 682                              N_("Use the done feature to terminate the stream")),
 683                 OPT_BOOL(0, "no-data", &no_data, N_("Skip output of blob data")),
 684                 OPT_END()
 685         };
 686
 687         if (argc == 1)
 688                 usage_with_options (fast_export_usage, options);
 689
 690         /* we handle encodings */
 691         git_config(git_default_config, NULL);
 692
 693         init_revisions(&revs, prefix);
 694         revs.topo_order = 1;
 695         revs.show_source = 1;
 696         revs.rewrite_parents = 1;
 697         argc = setup_revisions(argc, argv, &revs, NULL);
 698         argc = parse_options(argc, argv, prefix, options, fast_export_usage, 0);
 699         if (argc > 1)
 700                 usage_with_options (fast_export_usage, options);
 701
 702         if (use_done_feature)
 703                 printf("feature done\n");
 704
 705         if (import_filename)
 706                 import_marks(import_filename);
 707         lastimportid = last_idnum;
 708
 709         if (import_filename && revs.prune_data.nr)
 710                 full_tree = 1;
 711
 712         get_tags_and_duplicates(&revs.cmdline, &extra_refs);
 713
 714         if (prepare_revision_walk(&revs))
 715                 die("revision walk setup failed");
 716         revs.diffopt.format_callback = show_filemodify;
 717         DIFF_OPT_SET(&revs.diffopt, RECURSIVE);
 718         while ((commit = get_revision(&revs))) {
 719                 if (has_unshown_parent(commit)) {
 720                         add_object_array(&commit->object, NULL, &commits);
 721                 }
 722                 else {
 723                         handle_commit(commit, &revs);
 724                         handle_tail(&commits, &revs);
 725                 }
 726         }
 727
 728         handle_tags_and_duplicates(&extra_refs);
 729
 730         if (export_filename && lastimportid != last_idnum)
 731                 export_marks(export_filename);
 732
 733         if (use_done_feature)
 734                 printf("done\n");
 735
 736         return 0;
 737 }