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 #define REF_HANDLED (ALL_REV_FLAGS + 1)
  22
  23 static const char *fast_export_usage[] = {
  24         N_("git fast-export [rev-list-opts]"),
  25         NULL
  26 };
  27
  28 static int progress;
  29 static enum { ABORT, VERBATIM, WARN, STRIP } signed_tag_mode = ABORT;
  30 static enum { ERROR, DROP, REWRITE } tag_of_filtered_mode = ERROR;
  31 static int fake_missing_tagger;
  32 static int use_done_feature;
  33 static int no_data;
  34 static int full_tree;
  35
  36 static int parse_opt_signed_tag_mode(const struct option *opt,
  37                                      const char *arg, int unset)
  38 {
  39         if (unset || !strcmp(arg, "abort"))
  40                 signed_tag_mode = ABORT;
  41         else if (!strcmp(arg, "verbatim") || !strcmp(arg, "ignore"))
  42                 signed_tag_mode = VERBATIM;
  43         else if (!strcmp(arg, "warn"))
  44                 signed_tag_mode = WARN;
  45         else if (!strcmp(arg, "strip"))
  46                 signed_tag_mode = STRIP;
  47         else
  48                 return error("Unknown signed-tag 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 handle_object(const unsigned char *sha1)
 119 {
 120         unsigned long size;
 121         enum object_type type;
 122         char *buf;
 123         struct object *object;
 124
 125         if (no_data)
 126                 return;
 127
 128         if (is_null_sha1(sha1))
 129                 return;
 130
 131         object = parse_object(sha1);
 132         if (!object)
 133                 die ("Could not read blob %s", sha1_to_hex(sha1));
 134
 135         if (object->flags & SHOWN)
 136                 return;
 137
 138         buf = read_sha1_file(sha1, &type, &size);
 139         if (!buf)
 140                 die ("Could not read blob %s", sha1_to_hex(sha1));
 141
 142         mark_next_object(object);
 143
 144         printf("blob\nmark :%"PRIu32"\ndata %lu\n", last_idnum, size);
 145         if (size && fwrite(buf, size, 1, stdout) != 1)
 146                 die_errno ("Could not write blob '%s'", sha1_to_hex(sha1));
 147         printf("\n");
 148
 149         show_progress();
 150
 151         object->flags |= SHOWN;
 152         free(buf);
 153 }
 154
 155 static int depth_first(const void *a_, const void *b_)
 156 {
 157         const struct diff_filepair *a = *((const struct diff_filepair **)a_);
 158         const struct diff_filepair *b = *((const struct diff_filepair **)b_);
 159         const char *name_a, *name_b;
 160         int len_a, len_b, len;
 161         int cmp;
 162
 163         name_a = a->one ? a->one->path : a->two->path;
 164         name_b = b->one ? b->one->path : b->two->path;
 165
 166         len_a = strlen(name_a);
 167         len_b = strlen(name_b);
 168         len = (len_a < len_b) ? len_a : len_b;
 169
 170         /* strcmp will sort 'd' before 'd/e', we want 'd/e' before 'd' */
 171         cmp = memcmp(name_a, name_b, len);
 172         if (cmp)
 173                 return cmp;
 174         cmp = len_b - len_a;
 175         if (cmp)
 176                 return cmp;
 177         /*
 178          * Move 'R'ename entries last so that all references of the file
 179          * appear in the output before it is renamed (e.g., when a file
 180          * was copied and renamed in the same commit).
 181          */
 182         return (a->status == 'R') - (b->status == 'R');
 183 }
 184
 185 static void print_path(const char *path)
 186 {
 187         int need_quote = quote_c_style(path, NULL, NULL, 0);
 188         if (need_quote)
 189                 quote_c_style(path, NULL, stdout, 0);
 190         else if (strchr(path, ' '))
 191                 printf("\"%s\"", path);
 192         else
 193                 printf("%s", path);
 194 }
 195
 196 static void show_filemodify(struct diff_queue_struct *q,
 197                             struct diff_options *options, void *data)
 198 {
 199         int i;
 200
 201         /*
 202          * Handle files below a directory first, in case they are all deleted
 203          * and the directory changes to a file or symlink.
 204          */
 205         qsort(q->queue, q->nr, sizeof(q->queue[0]), depth_first);
 206
 207         for (i = 0; i < q->nr; i++) {
 208                 struct diff_filespec *ospec = q->queue[i]->one;
 209                 struct diff_filespec *spec = q->queue[i]->two;
 210
 211                 switch (q->queue[i]->status) {
 212                 case DIFF_STATUS_DELETED:
 213                         printf("D ");
 214                         print_path(spec->path);
 215                         putchar('\n');
 216                         break;
 217
 218                 case DIFF_STATUS_COPIED:
 219                 case DIFF_STATUS_RENAMED:
 220                         printf("%c ", q->queue[i]->status);
 221                         print_path(ospec->path);
 222                         putchar(' ');
 223                         print_path(spec->path);
 224                         putchar('\n');
 225
 226                         if (!hashcmp(ospec->sha1, spec->sha1) &&
 227                             ospec->mode == spec->mode)
 228                                 break;
 229                         /* fallthrough */
 230
 231                 case DIFF_STATUS_TYPE_CHANGED:
 232                 case DIFF_STATUS_MODIFIED:
 233                 case DIFF_STATUS_ADDED:
 234                         /*
 235                          * Links refer to objects in another repositories;
 236                          * output the SHA-1 verbatim.
 237                          */
 238                         if (no_data || S_ISGITLINK(spec->mode))
 239                                 printf("M %06o %s ", spec->mode,
 240                                        sha1_to_hex(spec->sha1));
 241                         else {
 242                                 struct object *object = lookup_object(spec->sha1);
 243                                 printf("M %06o :%d ", spec->mode,
 244                                        get_object_mark(object));
 245                         }
 246                         print_path(spec->path);
 247                         putchar('\n');
 248                         break;
 249
 250                 default:
 251                         die("Unexpected comparison status '%c' for %s, %s",
 252                                 q->queue[i]->status,
 253                                 ospec->path ? ospec->path : "none",
 254                                 spec->path ? spec->path : "none");
 255                 }
 256         }
 257 }
 258
 259 static const char *find_encoding(const char *begin, const char *end)
 260 {
 261         const char *needle = "\nencoding ";
 262         char *bol, *eol;
 263
 264         bol = memmem(begin, end ? end - begin : strlen(begin),
 265                      needle, strlen(needle));
 266         if (!bol)
 267                 return git_commit_encoding;
 268         bol += strlen(needle);
 269         eol = strchrnul(bol, '\n');
 270         *eol = '\0';
 271         return bol;
 272 }
 273
 274 static void handle_commit(struct commit *commit, struct rev_info *rev)
 275 {
 276         int saved_output_format = rev->diffopt.output_format;
 277         const char *author, *author_end, *committer, *committer_end;
 278         const char *encoding, *message;
 279         char *reencoded = NULL;
 280         struct commit_list *p;
 281         int i;
 282
 283         rev->diffopt.output_format = DIFF_FORMAT_CALLBACK;
 284
 285         parse_commit(commit);
 286         author = strstr(commit->buffer, "\nauthor ");
 287         if (!author)
 288                 die ("Could not find author in commit %s",
 289                      sha1_to_hex(commit->object.sha1));
 290         author++;
 291         author_end = strchrnul(author, '\n');
 292         committer = strstr(author_end, "\ncommitter ");
 293         if (!committer)
 294                 die ("Could not find committer in commit %s",
 295                      sha1_to_hex(commit->object.sha1));
 296         committer++;
 297         committer_end = strchrnul(committer, '\n');
 298         message = strstr(committer_end, "\n\n");
 299         encoding = find_encoding(committer_end, message);
 300         if (message)
 301                 message += 2;
 302
 303         if (commit->parents &&
 304             get_object_mark(&commit->parents->item->object) != 0 &&
 305             !full_tree) {
 306                 parse_commit(commit->parents->item);
 307                 diff_tree_sha1(commit->parents->item->tree->object.sha1,
 308                                commit->tree->object.sha1, "", &rev->diffopt);
 309         }
 310         else
 311                 diff_root_tree_sha1(commit->tree->object.sha1,
 312                                     "", &rev->diffopt);
 313
 314         /* Export the referenced blobs, and remember the marks. */
 315         for (i = 0; i < diff_queued_diff.nr; i++)
 316                 if (!S_ISGITLINK(diff_queued_diff.queue[i]->two->mode))
 317                         handle_object(diff_queued_diff.queue[i]->two->sha1);
 318
 319         mark_next_object(&commit->object);
 320         if (!is_encoding_utf8(encoding))
 321                 reencoded = reencode_string(message, "UTF-8", encoding);
 322         if (!commit->parents)
 323                 printf("reset %s\n", (const char*)commit->util);
 324         printf("commit %s\nmark :%"PRIu32"\n%.*s\n%.*s\ndata %u\n%s",
 325                (const char *)commit->util, last_idnum,
 326                (int)(author_end - author), author,
 327                (int)(committer_end - committer), committer,
 328                (unsigned)(reencoded
 329                           ? strlen(reencoded) : message
 330                           ? strlen(message) : 0),
 331                reencoded ? reencoded : message ? message : "");
 332         free(reencoded);
 333
 334         for (i = 0, p = commit->parents; p; p = p->next) {
 335                 int mark = get_object_mark(&p->item->object);
 336                 if (!mark)
 337                         continue;
 338                 if (i == 0)
 339                         printf("from :%d\n", mark);
 340                 else
 341                         printf("merge :%d\n", mark);
 342                 i++;
 343         }
 344
 345         if (full_tree)
 346                 printf("deleteall\n");
 347         log_tree_diff_flush(rev);
 348         rev->diffopt.output_format = saved_output_format;
 349
 350         printf("\n");
 351
 352         show_progress();
 353 }
 354
 355 static void handle_tail(struct object_array *commits, struct rev_info *revs)
 356 {
 357         struct commit *commit;
 358         while (commits->nr) {
 359                 commit = (struct commit *)commits->objects[commits->nr - 1].item;
 360                 if (has_unshown_parent(commit))
 361                         return;
 362                 handle_commit(commit, revs);
 363                 commits->nr--;
 364         }
 365 }
 366
 367 static void handle_tag(const char *name, struct tag *tag)
 368 {
 369         unsigned long size;
 370         enum object_type type;
 371         char *buf;
 372         const char *tagger, *tagger_end, *message;
 373         size_t message_size = 0;
 374         struct object *tagged;
 375         int tagged_mark;
 376         struct commit *p;
 377
 378         /* Trees have no identifer in fast-export output, thus we have no way
 379          * to output tags of trees, tags of tags of trees, etc.  Simply omit
 380          * such tags.
 381          */
 382         tagged = tag->tagged;
 383         while (tagged->type == OBJ_TAG) {
 384                 tagged = ((struct tag *)tagged)->tagged;
 385         }
 386         if (tagged->type == OBJ_TREE) {
 387                 warning("Omitting tag %s,\nsince tags of trees (or tags of tags of trees, etc.) are not supported.",
 388                         sha1_to_hex(tag->object.sha1));
 389                 return;
 390         }
 391
 392         buf = read_sha1_file(tag->object.sha1, &type, &size);
 393         if (!buf)
 394                 die ("Could not read tag %s", sha1_to_hex(tag->object.sha1));
 395         message = memmem(buf, size, "\n\n", 2);
 396         if (message) {
 397                 message += 2;
 398                 message_size = strlen(message);
 399         }
 400         tagger = memmem(buf, message ? message - buf : size, "\ntagger ", 8);
 401         if (!tagger) {
 402                 if (fake_missing_tagger)
 403                         tagger = "tagger Unspecified Tagger "
 404                                 "<unspecified-tagger> 0 +0000";
 405                 else
 406                         tagger = "";
 407                 tagger_end = tagger + strlen(tagger);
 408         } else {
 409                 tagger++;
 410                 tagger_end = strchrnul(tagger, '\n');
 411         }
 412
 413         /* handle signed tags */
 414         if (message) {
 415                 const char *signature = strstr(message,
 416                                                "\n-----BEGIN PGP SIGNATURE-----\n");
 417                 if (signature)
 418                         switch(signed_tag_mode) {
 419                         case ABORT:
 420                                 die ("Encountered signed tag %s; use "
 421                                      "--signed-tag=<mode> to handle it.",
 422                                      sha1_to_hex(tag->object.sha1));
 423                         case WARN:
 424                                 warning ("Exporting signed tag %s",
 425                                          sha1_to_hex(tag->object.sha1));
 426                                 /* fallthru */
 427                         case VERBATIM:
 428                                 break;
 429                         case STRIP:
 430                                 message_size = signature + 1 - message;
 431                                 break;
 432                         }
 433         }
 434
 435         /* handle tag->tagged having been filtered out due to paths specified */
 436         tagged = tag->tagged;
 437         tagged_mark = get_object_mark(tagged);
 438         if (!tagged_mark) {
 439                 switch(tag_of_filtered_mode) {
 440                 case ABORT:
 441                         die ("Tag %s tags unexported object; use "
 442                              "--tag-of-filtered-object=<mode> to handle it.",
 443                              sha1_to_hex(tag->object.sha1));
 444                 case DROP:
 445                         /* Ignore this tag altogether */
 446                         return;
 447                 case REWRITE:
 448                         if (tagged->type != OBJ_COMMIT) {
 449                                 die ("Tag %s tags unexported %s!",
 450                                      sha1_to_hex(tag->object.sha1),
 451                                      typename(tagged->type));
 452                         }
 453                         p = (struct commit *)tagged;
 454                         for (;;) {
 455                                 if (p->parents && p->parents->next)
 456                                         break;
 457                                 if (p->object.flags & UNINTERESTING)
 458                                         break;
 459                                 if (!(p->object.flags & TREESAME))
 460                                         break;
 461                                 if (!p->parents)
 462                                         die ("Can't find replacement commit for tag %s\n",
 463                                              sha1_to_hex(tag->object.sha1));
 464                                 p = p->parents->item;
 465                         }
 466                         tagged_mark = get_object_mark(&p->object);
 467                 }
 468         }
 469
 470         if (!prefixcmp(name, "refs/tags/"))
 471                 name += 10;
 472         printf("tag %s\nfrom :%d\n%.*s%sdata %d\n%.*s\n",
 473                name, tagged_mark,
 474                (int)(tagger_end - tagger), tagger,
 475                tagger == tagger_end ? "" : "\n",
 476                (int)message_size, (int)message_size, message ? message : "");
 477 }
 478
 479 static void get_tags_and_duplicates(struct object_array *pending,
 480                                     struct string_list *refs,
 481                                     struct string_list *extra_refs)
 482 {
 483         struct tag *tag;
 484         int i;
 485
 486         for (i = 0; i < pending->nr; i++) {
 487                 struct object_array_entry *e = pending->objects + i;
 488                 unsigned char sha1[20];
 489                 struct commit *commit = commit;
 490                 char *full_name;
 491
 492                 if ((e->flags & UNINTERESTING) || dwim_ref(e->name, strlen(e->name), sha1, &full_name) != 1)
 493                         continue;
 494
 495                 switch (e->item->type) {
 496                 case OBJ_COMMIT:
 497                         commit = (struct commit *)e->item;
 498                         break;
 499                 case OBJ_TAG:
 500                         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                         switch(tag->object.type) {
 511                         case OBJ_COMMIT:
 512                                 commit = (struct commit *)tag;
 513                                 break;
 514                         case OBJ_BLOB:
 515                                 handle_object(tag->object.sha1);
 516                                 continue;
 517                         default: /* OBJ_TAG (nested tags) is already handled */
 518                                 warning("Tag points to object of unexpected type %s, skipping.",
 519                                         typename(tag->object.type));
 520                                 continue;
 521                         }
 522                         break;
 523                 default:
 524                         warning("%s: Unexpected object of type %s, skipping.",
 525                                 e->name,
 526                                 typename(e->item->type));
 527                         continue;
 528                 }
 529                 if (commit->util)
 530                         /* more than one name for the same object */
 531                         string_list_append(extra_refs, full_name)->util = commit;
 532                 else {
 533                         commit->util = full_name;
 534                         /* we might need to set this ref explicitly */
 535                         string_list_append(refs, full_name)->util = commit;
 536                 }
 537         }
 538 }
 539
 540 static void handle_reset(const char *name, struct object *object)
 541 {
 542         int mark = get_object_mark(object);
 543
 544         if (mark)
 545                 printf("reset %s\nfrom :%d\n\n", name,
 546                        get_object_mark(object));
 547         else
 548                 printf("reset %s\nfrom %s\n\n", name,
 549                        sha1_to_hex(object->sha1));
 550 }
 551
 552 static void handle_tags_and_duplicates(struct string_list *refs, struct string_list *extra_refs)
 553 {
 554         int i;
 555
 556         /* even if no commits were exported, we need to export the ref */
 557         for (i = refs->nr - 1; i >= 0; i--) {
 558                 const char *name = refs->items[i].string;
 559                 struct object *object = refs->items[i].util;
 560
 561                 if (!(object->flags & REF_HANDLED)) {
 562                         if (object->type & OBJ_TAG)
 563                                 handle_tag(name, (struct tag *)object);
 564                         else {
 565                                 if (!prefixcmp(name, "refs/tags/") &&
 566                                     (tag_of_filtered_mode != REWRITE ||
 567                                      !get_object_mark(object)))
 568                                         continue;
 569                                 handle_reset(name, object);
 570                                 object->flags |= REF_HANDLED;
 571                         }
 572                 }
 573         }
 574
 575         for (i = extra_refs->nr - 1; i >= 0; i--) {
 576                 const char *name = extra_refs->items[i].string;
 577                 struct object *object = extra_refs->items[i].util;
 578                 switch (object->type) {
 579                 case OBJ_TAG:
 580                         handle_tag(name, (struct tag *)object);
 581                         break;
 582                 case OBJ_COMMIT:
 583                         /* create refs pointing to already seen commits */
 584                         handle_reset(name, object);
 585                         show_progress();
 586                         break;
 587                 }
 588         }
 589 }
 590
 591 static void export_marks(char *file)
 592 {
 593         unsigned int i;
 594         uint32_t mark;
 595         struct object_decoration *deco = idnums.hash;
 596         FILE *f;
 597         int e = 0;
 598
 599         f = fopen(file, "w");
 600         if (!f)
 601                 die_errno("Unable to open marks file %s for writing.", file);
 602
 603         for (i = 0; i < idnums.size; i++) {
 604                 if (deco->base && deco->base->type == 1) {
 605                         mark = ptr_to_mark(deco->decoration);
 606                         if (fprintf(f, ":%"PRIu32" %s\n", mark,
 607                                 sha1_to_hex(deco->base->sha1)) < 0) {
 608                             e = 1;
 609                             break;
 610                         }
 611                 }
 612                 deco++;
 613         }
 614
 615         e |= ferror(f);
 616         e |= fclose(f);
 617         if (e)
 618                 error("Unable to write marks file %s.", file);
 619 }
 620
 621 static void import_marks(char *input_file)
 622 {
 623         char line[512];
 624         FILE *f = fopen(input_file, "r");
 625         if (!f)
 626                 die_errno("cannot read '%s'", input_file);
 627
 628         while (fgets(line, sizeof(line), f)) {
 629                 uint32_t mark;
 630                 char *line_end, *mark_end;
 631                 unsigned char sha1[20];
 632                 struct object *object;
 633
 634                 line_end = strchr(line, '\n');
 635                 if (line[0] != ':' || !line_end)
 636                         die("corrupt mark line: %s", line);
 637                 *line_end = '\0';
 638
 639                 mark = strtoumax(line + 1, &mark_end, 10);
 640                 if (!mark || mark_end == line + 1
 641                         || *mark_end != ' ' || get_sha1(mark_end + 1, sha1))
 642                         die("corrupt mark line: %s", line);
 643
 644                 object = parse_object(sha1);
 645                 if (!object)
 646                         die ("Could not read blob %s", sha1_to_hex(sha1));
 647
 648                 if (object->flags & SHOWN)
 649                         error("Object %s already has a mark", sha1_to_hex(sha1));
 650
 651                 mark_object(object, mark);
 652                 if (last_idnum < mark)
 653                         last_idnum = mark;
 654
 655                 object->flags |= SHOWN;
 656         }
 657         fclose(f);
 658 }
 659
 660 int cmd_fast_export(int argc, const char **argv, const char *prefix)
 661 {
 662         struct rev_info revs;
 663         struct object_array commits = OBJECT_ARRAY_INIT;
 664         struct string_list refs = STRING_LIST_INIT_NODUP, extra_refs = STRING_LIST_INIT_NODUP;
 665         struct commit *commit;
 666         char *export_filename = NULL, *import_filename = NULL;
 667         struct option options[] = {
 668                 OPT_INTEGER(0, "progress", &progress,
 669                             N_("show progress after <n> objects")),
 670                 OPT_CALLBACK(0, "signed-tags", &signed_tag_mode, N_("mode"),
 671                              N_("select handling of signed tags"),
 672                              parse_opt_signed_tag_mode),
 673                 OPT_CALLBACK(0, "tag-of-filtered-object", &tag_of_filtered_mode, N_("mode"),
 674                              N_("select handling of tags that tag filtered objects"),
 675                              parse_opt_tag_of_filtered_mode),
 676                 OPT_STRING(0, "export-marks", &export_filename, N_("file"),
 677                              N_("Dump marks to this file")),
 678                 OPT_STRING(0, "import-marks", &import_filename, N_("file"),
 679                              N_("Import marks from this file")),
 680                 OPT_BOOLEAN(0, "fake-missing-tagger", &fake_missing_tagger,
 681                              N_("Fake a tagger when tags lack one")),
 682                 OPT_BOOLEAN(0, "full-tree", &full_tree,
 683                              N_("Output full tree for each commit")),
 684                 OPT_BOOLEAN(0, "use-done-feature", &use_done_feature,
 685                              N_("Use the done feature to terminate the stream")),
 686                 OPT_BOOL(0, "no-data", &no_data, N_("Skip output of blob data")),
 687                 OPT_END()
 688         };
 689
 690         if (argc == 1)
 691                 usage_with_options (fast_export_usage, options);
 692
 693         /* we handle encodings */
 694         git_config(git_default_config, NULL);
 695
 696         init_revisions(&revs, prefix);
 697         revs.topo_order = 1;
 698         revs.show_source = 1;
 699         revs.rewrite_parents = 1;
 700         argc = setup_revisions(argc, argv, &revs, NULL);
 701         argc = parse_options(argc, argv, prefix, options, fast_export_usage, 0);
 702         if (argc > 1)
 703                 usage_with_options (fast_export_usage, options);
 704
 705         if (use_done_feature)
 706                 printf("feature done\n");
 707
 708         if (import_filename)
 709                 import_marks(import_filename);
 710
 711         if (import_filename && revs.prune_data.nr)
 712                 full_tree = 1;
 713
 714         get_tags_and_duplicates(&revs.pending, &refs, &extra_refs);
 715
 716         if (prepare_revision_walk(&revs))
 717                 die("revision walk setup failed");
 718         revs.diffopt.format_callback = show_filemodify;
 719         DIFF_OPT_SET(&revs.diffopt, RECURSIVE);
 720         while ((commit = get_revision(&revs))) {
 721                 if (has_unshown_parent(commit)) {
 722                         add_object_array(&commit->object, NULL, &commits);
 723                 }
 724                 else {
 725                         handle_commit(commit, &revs);
 726                         commit->object.flags |= REF_HANDLED;
 727                         handle_tail(&commits, &revs);
 728                 }
 729         }
 730
 731         handle_tags_and_duplicates(&refs, &extra_refs);
 732
 733         if (export_filename)
 734                 export_marks(export_filename);
 735
 736         if (use_done_feature)
 737                 printf("done\n");
 738
 739         return 0;
 740 }