Andrew's git - gitweb.git/blob - builtin/fast-export.c

   1/*
   2 * "git fast-export" builtin command
   3 *
   4 * Copyright (C) 2007 Johannes E. Schindelin
   5 */
   6#include "builtin.h"
   7#include "cache.h"
   8#include "commit.h"
   9#include "object.h"
  10#include "tag.h"
  11#include "diff.h"
  12#include "diffcore.h"
  13#include "log-tree.h"
  14#include "revision.h"
  15#include "decorate.h"
  16#include "string-list.h"
  17#include "utf8.h"
  18#include "parse-options.h"
  19#include "quote.h"
  20
  21static const char *fast_export_usage[] = {
  22        N_("git fast-export [rev-list-opts]"),
  23        NULL
  24};
  25
  26static int progress;
  27static enum { ABORT, VERBATIM, WARN, WARN_STRIP, STRIP } signed_tag_mode = ABORT;
  28static enum { ERROR, DROP, REWRITE } tag_of_filtered_mode = ERROR;
  29static int fake_missing_tagger;
  30static int use_done_feature;
  31static int no_data;
  32static int full_tree;
  33static struct string_list extra_refs = STRING_LIST_INIT_NODUP;
  34
  35static int parse_opt_signed_tag_mode(const struct option *opt,
  36                                     const char *arg, int unset)
  37{
  38        if (unset || !strcmp(arg, "abort"))
  39                signed_tag_mode = ABORT;
  40        else if (!strcmp(arg, "verbatim") || !strcmp(arg, "ignore"))
  41                signed_tag_mode = VERBATIM;
  42        else if (!strcmp(arg, "warn"))
  43                signed_tag_mode = WARN;
  44        else if (!strcmp(arg, "warn-strip"))
  45                signed_tag_mode = WARN_STRIP;
  46        else if (!strcmp(arg, "strip"))
  47                signed_tag_mode = STRIP;
  48        else
  49                return error("Unknown signed-tags mode: %s", arg);
  50        return 0;
  51}
  52
  53static int parse_opt_tag_of_filtered_mode(const struct option *opt,
  54                                          const char *arg, int unset)
  55{
  56        if (unset || !strcmp(arg, "abort"))
  57                tag_of_filtered_mode = ERROR;
  58        else if (!strcmp(arg, "drop"))
  59                tag_of_filtered_mode = DROP;
  60        else if (!strcmp(arg, "rewrite"))
  61                tag_of_filtered_mode = REWRITE;
  62        else
  63                return error("Unknown tag-of-filtered mode: %s", arg);
  64        return 0;
  65}
  66
  67static struct decoration idnums;
  68static uint32_t last_idnum;
  69
  70static int has_unshown_parent(struct commit *commit)
  71{
  72        struct commit_list *parent;
  73
  74        for (parent = commit->parents; parent; parent = parent->next)
  75                if (!(parent->item->object.flags & SHOWN) &&
  76                    !(parent->item->object.flags & UNINTERESTING))
  77                        return 1;
  78        return 0;
  79}
  80
  81/* Since intptr_t is C99, we do not use it here */
  82static inline uint32_t *mark_to_ptr(uint32_t mark)
  83{
  84        return ((uint32_t *)NULL) + mark;
  85}
  86
  87static inline uint32_t ptr_to_mark(void * mark)
  88{
  89        return (uint32_t *)mark - (uint32_t *)NULL;
  90}
  91
  92static inline void mark_object(struct object *object, uint32_t mark)
  93{
  94        add_decoration(&idnums, object, mark_to_ptr(mark));
  95}
  96
  97static inline void mark_next_object(struct object *object)
  98{
  99        mark_object(object, ++last_idnum);
 100}
 101
 102static int get_object_mark(struct object *object)
 103{
 104        void *decoration = lookup_decoration(&idnums, object);
 105        if (!decoration)
 106                return 0;
 107        return ptr_to_mark(decoration);
 108}
 109
 110static void show_progress(void)
 111{
 112        static int counter = 0;
 113        if (!progress)
 114                return;
 115        if ((++counter % progress) == 0)
 116                printf("progress %d objects\n", counter);
 117}
 118
 119static void export_blob(const unsigned char *sha1)
 120{
 121        unsigned long size;
 122        enum object_type type;
 123        char *buf;
 124        struct object *object;
 125        int eaten;
 126
 127        if (no_data)
 128                return;
 129
 130        if (is_null_sha1(sha1))
 131                return;
 132
 133        object = lookup_object(sha1);
 134        if (object && object->flags & SHOWN)
 135                return;
 136
 137        buf = read_sha1_file(sha1, &type, &size);
 138        if (!buf)
 139                die ("Could not read blob %s", sha1_to_hex(sha1));
 140        if (check_sha1_signature(sha1, buf, size, typename(type)) < 0)
 141                die("sha1 mismatch in blob %s", sha1_to_hex(sha1));
 142        object = parse_object_buffer(sha1, type, size, buf, &eaten);
 143        if (!object)
 144                die("Could not read blob %s", sha1_to_hex(sha1));
 145
 146        mark_next_object(object);
 147
 148        printf("blob\nmark :%"PRIu32"\ndata %lu\n", last_idnum, size);
 149        if (size && fwrite(buf, size, 1, stdout) != 1)
 150                die_errno ("Could not write blob '%s'", sha1_to_hex(sha1));
 151        printf("\n");
 152
 153        show_progress();
 154
 155        object->flags |= SHOWN;
 156        if (!eaten)
 157                free(buf);
 158}
 159
 160static int depth_first(const void *a_, const void *b_)
 161{
 162        const struct diff_filepair *a = *((const struct diff_filepair **)a_);
 163        const struct diff_filepair *b = *((const struct diff_filepair **)b_);
 164        const char *name_a, *name_b;
 165        int len_a, len_b, len;
 166        int cmp;
 167
 168        name_a = a->one ? a->one->path : a->two->path;
 169        name_b = b->one ? b->one->path : b->two->path;
 170
 171        len_a = strlen(name_a);
 172        len_b = strlen(name_b);
 173        len = (len_a < len_b) ? len_a : len_b;
 174
 175        /* strcmp will sort 'd' before 'd/e', we want 'd/e' before 'd' */
 176        cmp = memcmp(name_a, name_b, len);
 177        if (cmp)
 178                return cmp;
 179        cmp = len_b - len_a;
 180        if (cmp)
 181                return cmp;
 182        /*
 183         * Move 'R'ename entries last so that all references of the file
 184         * appear in the output before it is renamed (e.g., when a file
 185         * was copied and renamed in the same commit).
 186         */
 187        return (a->status == 'R') - (b->status == 'R');
 188}
 189
 190static void print_path(const char *path)
 191{
 192        int need_quote = quote_c_style(path, NULL, NULL, 0);
 193        if (need_quote)
 194                quote_c_style(path, NULL, stdout, 0);
 195        else if (strchr(path, ' '))
 196                printf("\"%s\"", path);
 197        else
 198                printf("%s", path);
 199}
 200
 201static void show_filemodify(struct diff_queue_struct *q,
 202                            struct diff_options *options, void *data)
 203{
 204        int i;
 205
 206        /*
 207         * Handle files below a directory first, in case they are all deleted
 208         * and the directory changes to a file or symlink.
 209         */
 210        qsort(q->queue, q->nr, sizeof(q->queue[0]), depth_first);
 211
 212        for (i = 0; i < q->nr; i++) {
 213                struct diff_filespec *ospec = q->queue[i]->one;
 214                struct diff_filespec *spec = q->queue[i]->two;
 215
 216                switch (q->queue[i]->status) {
 217                case DIFF_STATUS_DELETED:
 218                        printf("D ");
 219                        print_path(spec->path);
 220                        putchar('\n');
 221                        break;
 222
 223                case DIFF_STATUS_COPIED:
 224                case DIFF_STATUS_RENAMED:
 225                        printf("%c ", q->queue[i]->status);
 226                        print_path(ospec->path);
 227                        putchar(' ');
 228                        print_path(spec->path);
 229                        putchar('\n');
 230
 231                        if (!hashcmp(ospec->sha1, spec->sha1) &&
 232                            ospec->mode == spec->mode)
 233                                break;
 234                        /* fallthrough */
 235
 236                case DIFF_STATUS_TYPE_CHANGED:
 237                case DIFF_STATUS_MODIFIED:
 238                case DIFF_STATUS_ADDED:
 239                        /*
 240                         * Links refer to objects in another repositories;
 241                         * output the SHA-1 verbatim.
 242                         */
 243                        if (no_data || S_ISGITLINK(spec->mode))
 244                                printf("M %06o %s ", spec->mode,
 245                                       sha1_to_hex(spec->sha1));
 246                        else {
 247                                struct object *object = lookup_object(spec->sha1);
 248                                printf("M %06o :%d ", spec->mode,
 249                                       get_object_mark(object));
 250                        }
 251                        print_path(spec->path);
 252                        putchar('\n');
 253                        break;
 254
 255                default:
 256                        die("Unexpected comparison status '%c' for %s, %s",
 257                                q->queue[i]->status,
 258                                ospec->path ? ospec->path : "none",
 259                                spec->path ? spec->path : "none");
 260                }
 261        }
 262}
 263
 264static const char *find_encoding(const char *begin, const char *end)
 265{
 266        const char *needle = "\nencoding ";
 267        char *bol, *eol;
 268
 269        bol = memmem(begin, end ? end - begin : strlen(begin),
 270                     needle, strlen(needle));
 271        if (!bol)
 272                return git_commit_encoding;
 273        bol += strlen(needle);
 274        eol = strchrnul(bol, '\n');
 275        *eol = '\0';
 276        return bol;
 277}
 278
 279static void handle_commit(struct commit *commit, struct rev_info *rev)
 280{
 281        int saved_output_format = rev->diffopt.output_format;
 282        const char *author, *author_end, *committer, *committer_end;
 283        const char *encoding, *message;
 284        char *reencoded = NULL;
 285        struct commit_list *p;
 286        int i;
 287
 288        rev->diffopt.output_format = DIFF_FORMAT_CALLBACK;
 289
 290        parse_commit(commit);
 291        author = strstr(commit->buffer, "\nauthor ");
 292        if (!author)
 293                die ("Could not find author in commit %s",
 294                     sha1_to_hex(commit->object.sha1));
 295        author++;
 296        author_end = strchrnul(author, '\n');
 297        committer = strstr(author_end, "\ncommitter ");
 298        if (!committer)
 299                die ("Could not find committer in commit %s",
 300                     sha1_to_hex(commit->object.sha1));
 301        committer++;
 302        committer_end = strchrnul(committer, '\n');
 303        message = strstr(committer_end, "\n\n");
 304        encoding = find_encoding(committer_end, message);
 305        if (message)
 306                message += 2;
 307
 308        if (commit->parents &&
 309            get_object_mark(&commit->parents->item->object) != 0 &&
 310            !full_tree) {
 311                parse_commit(commit->parents->item);
 312                diff_tree_sha1(commit->parents->item->tree->object.sha1,
 313                               commit->tree->object.sha1, "", &rev->diffopt);
 314        }
 315        else
 316                diff_root_tree_sha1(commit->tree->object.sha1,
 317                                    "", &rev->diffopt);
 318
 319        /* Export the referenced blobs, and remember the marks. */
 320        for (i = 0; i < diff_queued_diff.nr; i++)
 321                if (!S_ISGITLINK(diff_queued_diff.queue[i]->two->mode))
 322                        export_blob(diff_queued_diff.queue[i]->two->sha1);
 323
 324        mark_next_object(&commit->object);
 325        if (!is_encoding_utf8(encoding))
 326                reencoded = reencode_string(message, "UTF-8", encoding);
 327        if (!commit->parents)
 328                printf("reset %s\n", (const char*)commit->util);
 329        printf("commit %s\nmark :%"PRIu32"\n%.*s\n%.*s\ndata %u\n%s",
 330               (const char *)commit->util, last_idnum,
 331               (int)(author_end - author), author,
 332               (int)(committer_end - committer), committer,
 333               (unsigned)(reencoded
 334                          ? strlen(reencoded) : message
 335                          ? strlen(message) : 0),
 336               reencoded ? reencoded : message ? message : "");
 337        free(reencoded);
 338
 339        for (i = 0, p = commit->parents; p; p = p->next) {
 340                int mark = get_object_mark(&p->item->object);
 341                if (!mark)
 342                        continue;
 343                if (i == 0)
 344                        printf("from :%d\n", mark);
 345                else
 346                        printf("merge :%d\n", mark);
 347                i++;
 348        }
 349
 350        if (full_tree)
 351                printf("deleteall\n");
 352        log_tree_diff_flush(rev);
 353        rev->diffopt.output_format = saved_output_format;
 354
 355        printf("\n");
 356
 357        show_progress();
 358}
 359
 360static void handle_tail(struct object_array *commits, struct rev_info *revs)
 361{
 362        struct commit *commit;
 363        while (commits->nr) {
 364                commit = (struct commit *)commits->objects[commits->nr - 1].item;
 365                if (has_unshown_parent(commit))
 366                        return;
 367                handle_commit(commit, revs);
 368                commits->nr--;
 369        }
 370}
 371
 372static void handle_tag(const char *name, struct tag *tag)
 373{
 374        unsigned long size;
 375        enum object_type type;
 376        char *buf;
 377        const char *tagger, *tagger_end, *message;
 378        size_t message_size = 0;
 379        struct object *tagged;
 380        int tagged_mark;
 381        struct commit *p;
 382
 383        /* Trees have no identifier in fast-export output, thus we have no way
 384         * to output tags of trees, tags of tags of trees, etc.  Simply omit
 385         * such tags.
 386         */
 387        tagged = tag->tagged;
 388        while (tagged->type == OBJ_TAG) {
 389                tagged = ((struct tag *)tagged)->tagged;
 390        }
 391        if (tagged->type == OBJ_TREE) {
 392                warning("Omitting tag %s,\nsince tags of trees (or tags of tags of trees, etc.) are not supported.",
 393                        sha1_to_hex(tag->object.sha1));
 394                return;
 395        }
 396
 397        buf = read_sha1_file(tag->object.sha1, &type, &size);
 398        if (!buf)
 399                die ("Could not read tag %s", sha1_to_hex(tag->object.sha1));
 400        message = memmem(buf, size, "\n\n", 2);
 401        if (message) {
 402                message += 2;
 403                message_size = strlen(message);
 404        }
 405        tagger = memmem(buf, message ? message - buf : size, "\ntagger ", 8);
 406        if (!tagger) {
 407                if (fake_missing_tagger)
 408                        tagger = "tagger Unspecified Tagger "
 409                                "<unspecified-tagger> 0 +0000";
 410                else
 411                        tagger = "";
 412                tagger_end = tagger + strlen(tagger);
 413        } else {
 414                tagger++;
 415                tagger_end = strchrnul(tagger, '\n');
 416        }
 417
 418        /* handle signed tags */
 419        if (message) {
 420                const char *signature = strstr(message,
 421                                               "\n-----BEGIN PGP SIGNATURE-----\n");
 422                if (signature)
 423                        switch(signed_tag_mode) {
 424                        case ABORT:
 425                                die ("Encountered signed tag %s; use "
 426                                     "--signed-tags=<mode> to handle it.",
 427                                     sha1_to_hex(tag->object.sha1));
 428                        case WARN:
 429                                warning ("Exporting signed tag %s",
 430                                         sha1_to_hex(tag->object.sha1));
 431                                /* fallthru */
 432                        case VERBATIM:
 433                                break;
 434                        case WARN_STRIP:
 435                                warning ("Stripping signature from tag %s",
 436                                         sha1_to_hex(tag->object.sha1));
 437                                /* fallthru */
 438                        case STRIP:
 439                                message_size = signature + 1 - message;
 440                                break;
 441                        }
 442        }
 443
 444        /* handle tag->tagged having been filtered out due to paths specified */
 445        tagged = tag->tagged;
 446        tagged_mark = get_object_mark(tagged);
 447        if (!tagged_mark) {
 448                switch(tag_of_filtered_mode) {
 449                case ABORT:
 450                        die ("Tag %s tags unexported object; use "
 451                             "--tag-of-filtered-object=<mode> to handle it.",
 452                             sha1_to_hex(tag->object.sha1));
 453                case DROP:
 454                        /* Ignore this tag altogether */
 455                        return;
 456                case REWRITE:
 457                        if (tagged->type != OBJ_COMMIT) {
 458                                die ("Tag %s tags unexported %s!",
 459                                     sha1_to_hex(tag->object.sha1),
 460                                     typename(tagged->type));
 461                        }
 462                        p = (struct commit *)tagged;
 463                        for (;;) {
 464                                if (p->parents && p->parents->next)
 465                                        break;
 466                                if (p->object.flags & UNINTERESTING)
 467                                        break;
 468                                if (!(p->object.flags & TREESAME))
 469                                        break;
 470                                if (!p->parents)
 471                                        die ("Can't find replacement commit for tag %s\n",
 472                                             sha1_to_hex(tag->object.sha1));
 473                                p = p->parents->item;
 474                        }
 475                        tagged_mark = get_object_mark(&p->object);
 476                }
 477        }
 478
 479        if (!prefixcmp(name, "refs/tags/"))
 480                name += 10;
 481        printf("tag %s\nfrom :%d\n%.*s%sdata %d\n%.*s\n",
 482               name, tagged_mark,
 483               (int)(tagger_end - tagger), tagger,
 484               tagger == tagger_end ? "" : "\n",
 485               (int)message_size, (int)message_size, message ? message : "");
 486}
 487
 488static struct commit *get_commit(struct rev_cmdline_entry *e, char *full_name)
 489{
 490        switch (e->item->type) {
 491        case OBJ_COMMIT:
 492                return (struct commit *)e->item;
 493        case OBJ_TAG: {
 494                struct tag *tag = (struct tag *)e->item;
 495
 496                /* handle nested tags */
 497                while (tag && tag->object.type == OBJ_TAG) {
 498                        parse_object(tag->object.sha1);
 499                        string_list_append(&extra_refs, full_name)->util = tag;
 500                        tag = (struct tag *)tag->tagged;
 501                }
 502                if (!tag)
 503                        die("Tag %s points nowhere?", e->name);
 504                return (struct commit *)tag;
 505                break;
 506        }
 507        default:
 508                return NULL;
 509        }
 510}
 511
 512static void get_tags_and_duplicates(struct rev_cmdline_info *info)
 513{
 514        int i;
 515
 516        for (i = 0; i < info->nr; i++) {
 517                struct rev_cmdline_entry *e = info->rev + i;
 518                unsigned char sha1[20];
 519                struct commit *commit;
 520                char *full_name;
 521
 522                if (e->flags & UNINTERESTING)
 523                        continue;
 524
 525                if (dwim_ref(e->name, strlen(e->name), sha1, &full_name) != 1)
 526                        continue;
 527
 528                commit = get_commit(e, full_name);
 529                if (!commit) {
 530                        warning("%s: Unexpected object of type %s, skipping.",
 531                                e->name,
 532                                typename(e->item->type));
 533                        continue;
 534                }
 535
 536                switch(commit->object.type) {
 537                case OBJ_COMMIT:
 538                        break;
 539                case OBJ_BLOB:
 540                        export_blob(commit->object.sha1);
 541                        continue;
 542                default: /* OBJ_TAG (nested tags) is already handled */
 543                        warning("Tag points to object of unexpected type %s, skipping.",
 544                                typename(commit->object.type));
 545                        continue;
 546                }
 547
 548                /*
 549                 * This ref will not be updated through a commit, lets make
 550                 * sure it gets properly updated eventually.
 551                 */
 552                if (commit->util || commit->object.flags & SHOWN)
 553                        string_list_append(&extra_refs, full_name)->util = commit;
 554                if (!commit->util)
 555                        commit->util = full_name;
 556        }
 557}
 558
 559static void handle_tags_and_duplicates(void)
 560{
 561        struct commit *commit;
 562        int i;
 563
 564        for (i = extra_refs.nr - 1; i >= 0; i--) {
 565                const char *name = extra_refs.items[i].string;
 566                struct object *object = extra_refs.items[i].util;
 567                switch (object->type) {
 568                case OBJ_TAG:
 569                        handle_tag(name, (struct tag *)object);
 570                        break;
 571                case OBJ_COMMIT:
 572                        /* create refs pointing to already seen commits */
 573                        commit = (struct commit *)object;
 574                        printf("reset %s\nfrom :%d\n\n", name,
 575                               get_object_mark(&commit->object));
 576                        show_progress();
 577                        break;
 578                }
 579        }
 580}
 581
 582static void export_marks(char *file)
 583{
 584        unsigned int i;
 585        uint32_t mark;
 586        struct object_decoration *deco = idnums.hash;
 587        FILE *f;
 588        int e = 0;
 589
 590        f = fopen(file, "w");
 591        if (!f)
 592                die_errno("Unable to open marks file %s for writing.", file);
 593
 594        for (i = 0; i < idnums.size; i++) {
 595                if (deco->base && deco->base->type == 1) {
 596                        mark = ptr_to_mark(deco->decoration);
 597                        if (fprintf(f, ":%"PRIu32" %s\n", mark,
 598                                sha1_to_hex(deco->base->sha1)) < 0) {
 599                            e = 1;
 600                            break;
 601                        }
 602                }
 603                deco++;
 604        }
 605
 606        e |= ferror(f);
 607        e |= fclose(f);
 608        if (e)
 609                error("Unable to write marks file %s.", file);
 610}
 611
 612static void import_marks(char *input_file)
 613{
 614        char line[512];
 615        FILE *f = fopen(input_file, "r");
 616        if (!f)
 617                die_errno("cannot read '%s'", input_file);
 618
 619        while (fgets(line, sizeof(line), f)) {
 620                uint32_t mark;
 621                char *line_end, *mark_end;
 622                unsigned char sha1[20];
 623                struct object *object;
 624                struct commit *commit;
 625                enum object_type type;
 626
 627                line_end = strchr(line, '\n');
 628                if (line[0] != ':' || !line_end)
 629                        die("corrupt mark line: %s", line);
 630                *line_end = '\0';
 631
 632                mark = strtoumax(line + 1, &mark_end, 10);
 633                if (!mark || mark_end == line + 1
 634                        || *mark_end != ' ' || get_sha1_hex(mark_end + 1, sha1))
 635                        die("corrupt mark line: %s", line);
 636
 637                if (last_idnum < mark)
 638                        last_idnum = mark;
 639
 640                type = sha1_object_info(sha1, NULL);
 641                if (type < 0)
 642                        die("object not found: %s", sha1_to_hex(sha1));
 643
 644                if (type != OBJ_COMMIT)
 645                        /* only commits */
 646                        continue;
 647
 648                commit = lookup_commit(sha1);
 649                if (!commit)
 650                        die("not a commit? can't happen: %s", sha1_to_hex(sha1));
 651
 652                object = &commit->object;
 653
 654                if (object->flags & SHOWN)
 655                        error("Object %s already has a mark", sha1_to_hex(sha1));
 656
 657                mark_object(object, mark);
 658
 659                object->flags |= SHOWN;
 660        }
 661        fclose(f);
 662}
 663
 664int cmd_fast_export(int argc, const char **argv, const char *prefix)
 665{
 666        struct rev_info revs;
 667        struct object_array commits = OBJECT_ARRAY_INIT;
 668        struct commit *commit;
 669        char *export_filename = NULL, *import_filename = NULL;
 670        uint32_t lastimportid;
 671        struct option options[] = {
 672                OPT_INTEGER(0, "progress", &progress,
 673                            N_("show progress after <n> objects")),
 674                OPT_CALLBACK(0, "signed-tags", &signed_tag_mode, N_("mode"),
 675                             N_("select handling of signed tags"),
 676                             parse_opt_signed_tag_mode),
 677                OPT_CALLBACK(0, "tag-of-filtered-object", &tag_of_filtered_mode, N_("mode"),
 678                             N_("select handling of tags that tag filtered objects"),
 679                             parse_opt_tag_of_filtered_mode),
 680                OPT_STRING(0, "export-marks", &export_filename, N_("file"),
 681                             N_("Dump marks to this file")),
 682                OPT_STRING(0, "import-marks", &import_filename, N_("file"),
 683                             N_("Import marks from this file")),
 684                OPT_BOOL(0, "fake-missing-tagger", &fake_missing_tagger,
 685                         N_("Fake a tagger when tags lack one")),
 686                OPT_BOOL(0, "full-tree", &full_tree,
 687                         N_("Output full tree for each commit")),
 688                OPT_BOOL(0, "use-done-feature", &use_done_feature,
 689                             N_("Use the done feature to terminate the stream")),
 690                OPT_BOOL(0, "no-data", &no_data, N_("Skip output of blob data")),
 691                OPT_END()
 692        };
 693
 694        if (argc == 1)
 695                usage_with_options (fast_export_usage, options);
 696
 697        /* we handle encodings */
 698        git_config(git_default_config, NULL);
 699
 700        init_revisions(&revs, prefix);
 701        revs.topo_order = 1;
 702        revs.show_source = 1;
 703        revs.rewrite_parents = 1;
 704        argc = setup_revisions(argc, argv, &revs, NULL);
 705        argc = parse_options(argc, argv, prefix, options, fast_export_usage, 0);
 706        if (argc > 1)
 707                usage_with_options (fast_export_usage, options);
 708
 709        if (use_done_feature)
 710                printf("feature done\n");
 711
 712        if (import_filename)
 713                import_marks(import_filename);
 714        lastimportid = last_idnum;
 715
 716        if (import_filename && revs.prune_data.nr)
 717                full_tree = 1;
 718
 719        get_tags_and_duplicates(&revs.cmdline);
 720
 721        if (prepare_revision_walk(&revs))
 722                die("revision walk setup failed");
 723        revs.diffopt.format_callback = show_filemodify;
 724        DIFF_OPT_SET(&revs.diffopt, RECURSIVE);
 725        while ((commit = get_revision(&revs))) {
 726                if (has_unshown_parent(commit)) {
 727                        add_object_array(&commit->object, NULL, &commits);
 728                }
 729                else {
 730                        handle_commit(commit, &revs);
 731                        handle_tail(&commits, &revs);
 732                }
 733        }
 734
 735        handle_tags_and_duplicates();
 736
 737        if (export_filename && lastimportid != last_idnum)
 738                export_marks(export_filename);
 739
 740        if (use_done_feature)
 741                printf("done\n");
 742
 743        return 0;
 744}