builtin / fast-export.con commit Merge branch 'ew/send-email-readable-message-id' into maint (ffaa7c5)
   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 "refs.h"
   9#include "commit.h"
  10#include "object.h"
  11#include "tag.h"
  12#include "diff.h"
  13#include "diffcore.h"
  14#include "log-tree.h"
  15#include "revision.h"
  16#include "decorate.h"
  17#include "string-list.h"
  18#include "utf8.h"
  19#include "parse-options.h"
  20#include "quote.h"
  21#include "remote.h"
  22#include "blob.h"
  23
  24static const char *fast_export_usage[] = {
  25        N_("git fast-export [rev-list-opts]"),
  26        NULL
  27};
  28
  29static int progress;
  30static enum { ABORT, VERBATIM, WARN, WARN_STRIP, STRIP } signed_tag_mode = ABORT;
  31static enum { ERROR, DROP, REWRITE } tag_of_filtered_mode = ERROR;
  32static int fake_missing_tagger;
  33static int use_done_feature;
  34static int no_data;
  35static int full_tree;
  36static struct string_list extra_refs = STRING_LIST_INIT_NODUP;
  37static struct refspec *refspecs;
  38static int refspecs_nr;
  39static int anonymize;
  40
  41static int parse_opt_signed_tag_mode(const struct option *opt,
  42                                     const char *arg, int unset)
  43{
  44        if (unset || !strcmp(arg, "abort"))
  45                signed_tag_mode = ABORT;
  46        else if (!strcmp(arg, "verbatim") || !strcmp(arg, "ignore"))
  47                signed_tag_mode = VERBATIM;
  48        else if (!strcmp(arg, "warn"))
  49                signed_tag_mode = WARN;
  50        else if (!strcmp(arg, "warn-strip"))
  51                signed_tag_mode = WARN_STRIP;
  52        else if (!strcmp(arg, "strip"))
  53                signed_tag_mode = STRIP;
  54        else
  55                return error("Unknown signed-tags mode: %s", arg);
  56        return 0;
  57}
  58
  59static int parse_opt_tag_of_filtered_mode(const struct option *opt,
  60                                          const char *arg, int unset)
  61{
  62        if (unset || !strcmp(arg, "abort"))
  63                tag_of_filtered_mode = ERROR;
  64        else if (!strcmp(arg, "drop"))
  65                tag_of_filtered_mode = DROP;
  66        else if (!strcmp(arg, "rewrite"))
  67                tag_of_filtered_mode = REWRITE;
  68        else
  69                return error("Unknown tag-of-filtered mode: %s", arg);
  70        return 0;
  71}
  72
  73static struct decoration idnums;
  74static uint32_t last_idnum;
  75
  76static int has_unshown_parent(struct commit *commit)
  77{
  78        struct commit_list *parent;
  79
  80        for (parent = commit->parents; parent; parent = parent->next)
  81                if (!(parent->item->object.flags & SHOWN) &&
  82                    !(parent->item->object.flags & UNINTERESTING))
  83                        return 1;
  84        return 0;
  85}
  86
  87struct anonymized_entry {
  88        struct hashmap_entry hash;
  89        const char *orig;
  90        size_t orig_len;
  91        const char *anon;
  92        size_t anon_len;
  93};
  94
  95static int anonymized_entry_cmp(const void *va, const void *vb,
  96                                const void *data)
  97{
  98        const struct anonymized_entry *a = va, *b = vb;
  99        return a->orig_len != b->orig_len ||
 100                memcmp(a->orig, b->orig, a->orig_len);
 101}
 102
 103/*
 104 * Basically keep a cache of X->Y so that we can repeatedly replace
 105 * the same anonymized string with another. The actual generation
 106 * is farmed out to the generate function.
 107 */
 108static const void *anonymize_mem(struct hashmap *map,
 109                                 void *(*generate)(const void *, size_t *),
 110                                 const void *orig, size_t *len)
 111{
 112        struct anonymized_entry key, *ret;
 113
 114        if (!map->cmpfn)
 115                hashmap_init(map, anonymized_entry_cmp, 0);
 116
 117        hashmap_entry_init(&key, memhash(orig, *len));
 118        key.orig = orig;
 119        key.orig_len = *len;
 120        ret = hashmap_get(map, &key, NULL);
 121
 122        if (!ret) {
 123                ret = xmalloc(sizeof(*ret));
 124                hashmap_entry_init(&ret->hash, key.hash.hash);
 125                ret->orig = xstrdup(orig);
 126                ret->orig_len = *len;
 127                ret->anon = generate(orig, len);
 128                ret->anon_len = *len;
 129                hashmap_put(map, ret);
 130        }
 131
 132        *len = ret->anon_len;
 133        return ret->anon;
 134}
 135
 136/*
 137 * We anonymize each component of a path individually,
 138 * so that paths a/b and a/c will share a common root.
 139 * The paths are cached via anonymize_mem so that repeated
 140 * lookups for "a" will yield the same value.
 141 */
 142static void anonymize_path(struct strbuf *out, const char *path,
 143                           struct hashmap *map,
 144                           void *(*generate)(const void *, size_t *))
 145{
 146        while (*path) {
 147                const char *end_of_component = strchrnul(path, '/');
 148                size_t len = end_of_component - path;
 149                const char *c = anonymize_mem(map, generate, path, &len);
 150                strbuf_add(out, c, len);
 151                path = end_of_component;
 152                if (*path)
 153                        strbuf_addch(out, *path++);
 154        }
 155}
 156
 157/* Since intptr_t is C99, we do not use it here */
 158static inline uint32_t *mark_to_ptr(uint32_t mark)
 159{
 160        return ((uint32_t *)NULL) + mark;
 161}
 162
 163static inline uint32_t ptr_to_mark(void * mark)
 164{
 165        return (uint32_t *)mark - (uint32_t *)NULL;
 166}
 167
 168static inline void mark_object(struct object *object, uint32_t mark)
 169{
 170        add_decoration(&idnums, object, mark_to_ptr(mark));
 171}
 172
 173static inline void mark_next_object(struct object *object)
 174{
 175        mark_object(object, ++last_idnum);
 176}
 177
 178static int get_object_mark(struct object *object)
 179{
 180        void *decoration = lookup_decoration(&idnums, object);
 181        if (!decoration)
 182                return 0;
 183        return ptr_to_mark(decoration);
 184}
 185
 186static void show_progress(void)
 187{
 188        static int counter = 0;
 189        if (!progress)
 190                return;
 191        if ((++counter % progress) == 0)
 192                printf("progress %d objects\n", counter);
 193}
 194
 195/*
 196 * Ideally we would want some transformation of the blob data here
 197 * that is unreversible, but would still be the same size and have
 198 * the same data relationship to other blobs (so that we get the same
 199 * delta and packing behavior as the original). But the first and last
 200 * requirements there are probably mutually exclusive, so let's take
 201 * the easy way out for now, and just generate arbitrary content.
 202 *
 203 * There's no need to cache this result with anonymize_mem, since
 204 * we already handle blob content caching with marks.
 205 */
 206static char *anonymize_blob(unsigned long *size)
 207{
 208        static int counter;
 209        struct strbuf out = STRBUF_INIT;
 210        strbuf_addf(&out, "anonymous blob %d", counter++);
 211        *size = out.len;
 212        return strbuf_detach(&out, NULL);
 213}
 214
 215static void export_blob(const unsigned char *sha1)
 216{
 217        unsigned long size;
 218        enum object_type type;
 219        char *buf;
 220        struct object *object;
 221        int eaten;
 222
 223        if (no_data)
 224                return;
 225
 226        if (is_null_sha1(sha1))
 227                return;
 228
 229        object = lookup_object(sha1);
 230        if (object && object->flags & SHOWN)
 231                return;
 232
 233        if (anonymize) {
 234                buf = anonymize_blob(&size);
 235                object = (struct object *)lookup_blob(sha1);
 236                eaten = 0;
 237        } else {
 238                buf = read_sha1_file(sha1, &type, &size);
 239                if (!buf)
 240                        die ("Could not read blob %s", sha1_to_hex(sha1));
 241                if (check_sha1_signature(sha1, buf, size, typename(type)) < 0)
 242                        die("sha1 mismatch in blob %s", sha1_to_hex(sha1));
 243                object = parse_object_buffer(sha1, type, size, buf, &eaten);
 244        }
 245
 246        if (!object)
 247                die("Could not read blob %s", sha1_to_hex(sha1));
 248
 249        mark_next_object(object);
 250
 251        printf("blob\nmark :%"PRIu32"\ndata %lu\n", last_idnum, size);
 252        if (size && fwrite(buf, size, 1, stdout) != 1)
 253                die_errno ("Could not write blob '%s'", sha1_to_hex(sha1));
 254        printf("\n");
 255
 256        show_progress();
 257
 258        object->flags |= SHOWN;
 259        if (!eaten)
 260                free(buf);
 261}
 262
 263static int depth_first(const void *a_, const void *b_)
 264{
 265        const struct diff_filepair *a = *((const struct diff_filepair **)a_);
 266        const struct diff_filepair *b = *((const struct diff_filepair **)b_);
 267        const char *name_a, *name_b;
 268        int len_a, len_b, len;
 269        int cmp;
 270
 271        name_a = a->one ? a->one->path : a->two->path;
 272        name_b = b->one ? b->one->path : b->two->path;
 273
 274        len_a = strlen(name_a);
 275        len_b = strlen(name_b);
 276        len = (len_a < len_b) ? len_a : len_b;
 277
 278        /* strcmp will sort 'd' before 'd/e', we want 'd/e' before 'd' */
 279        cmp = memcmp(name_a, name_b, len);
 280        if (cmp)
 281                return cmp;
 282        cmp = len_b - len_a;
 283        if (cmp)
 284                return cmp;
 285        /*
 286         * Move 'R'ename entries last so that all references of the file
 287         * appear in the output before it is renamed (e.g., when a file
 288         * was copied and renamed in the same commit).
 289         */
 290        return (a->status == 'R') - (b->status == 'R');
 291}
 292
 293static void print_path_1(const char *path)
 294{
 295        int need_quote = quote_c_style(path, NULL, NULL, 0);
 296        if (need_quote)
 297                quote_c_style(path, NULL, stdout, 0);
 298        else if (strchr(path, ' '))
 299                printf("\"%s\"", path);
 300        else
 301                printf("%s", path);
 302}
 303
 304static void *anonymize_path_component(const void *path, size_t *len)
 305{
 306        static int counter;
 307        struct strbuf out = STRBUF_INIT;
 308        strbuf_addf(&out, "path%d", counter++);
 309        return strbuf_detach(&out, len);
 310}
 311
 312static void print_path(const char *path)
 313{
 314        if (!anonymize)
 315                print_path_1(path);
 316        else {
 317                static struct hashmap paths;
 318                static struct strbuf anon = STRBUF_INIT;
 319
 320                anonymize_path(&anon, path, &paths, anonymize_path_component);
 321                print_path_1(anon.buf);
 322                strbuf_reset(&anon);
 323        }
 324}
 325
 326static void *generate_fake_sha1(const void *old, size_t *len)
 327{
 328        static uint32_t counter = 1; /* avoid null sha1 */
 329        unsigned char *out = xcalloc(20, 1);
 330        put_be32(out + 16, counter++);
 331        return out;
 332}
 333
 334static const unsigned char *anonymize_sha1(const unsigned char *sha1)
 335{
 336        static struct hashmap sha1s;
 337        size_t len = 20;
 338        return anonymize_mem(&sha1s, generate_fake_sha1, sha1, &len);
 339}
 340
 341static void show_filemodify(struct diff_queue_struct *q,
 342                            struct diff_options *options, void *data)
 343{
 344        int i;
 345
 346        /*
 347         * Handle files below a directory first, in case they are all deleted
 348         * and the directory changes to a file or symlink.
 349         */
 350        qsort(q->queue, q->nr, sizeof(q->queue[0]), depth_first);
 351
 352        for (i = 0; i < q->nr; i++) {
 353                struct diff_filespec *ospec = q->queue[i]->one;
 354                struct diff_filespec *spec = q->queue[i]->two;
 355
 356                switch (q->queue[i]->status) {
 357                case DIFF_STATUS_DELETED:
 358                        printf("D ");
 359                        print_path(spec->path);
 360                        putchar('\n');
 361                        break;
 362
 363                case DIFF_STATUS_COPIED:
 364                case DIFF_STATUS_RENAMED:
 365                        printf("%c ", q->queue[i]->status);
 366                        print_path(ospec->path);
 367                        putchar(' ');
 368                        print_path(spec->path);
 369                        putchar('\n');
 370
 371                        if (!hashcmp(ospec->sha1, spec->sha1) &&
 372                            ospec->mode == spec->mode)
 373                                break;
 374                        /* fallthrough */
 375
 376                case DIFF_STATUS_TYPE_CHANGED:
 377                case DIFF_STATUS_MODIFIED:
 378                case DIFF_STATUS_ADDED:
 379                        /*
 380                         * Links refer to objects in another repositories;
 381                         * output the SHA-1 verbatim.
 382                         */
 383                        if (no_data || S_ISGITLINK(spec->mode))
 384                                printf("M %06o %s ", spec->mode,
 385                                       sha1_to_hex(anonymize ?
 386                                                   anonymize_sha1(spec->sha1) :
 387                                                   spec->sha1));
 388                        else {
 389                                struct object *object = lookup_object(spec->sha1);
 390                                printf("M %06o :%d ", spec->mode,
 391                                       get_object_mark(object));
 392                        }
 393                        print_path(spec->path);
 394                        putchar('\n');
 395                        break;
 396
 397                default:
 398                        die("Unexpected comparison status '%c' for %s, %s",
 399                                q->queue[i]->status,
 400                                ospec->path ? ospec->path : "none",
 401                                spec->path ? spec->path : "none");
 402                }
 403        }
 404}
 405
 406static const char *find_encoding(const char *begin, const char *end)
 407{
 408        const char *needle = "\nencoding ";
 409        char *bol, *eol;
 410
 411        bol = memmem(begin, end ? end - begin : strlen(begin),
 412                     needle, strlen(needle));
 413        if (!bol)
 414                return git_commit_encoding;
 415        bol += strlen(needle);
 416        eol = strchrnul(bol, '\n');
 417        *eol = '\0';
 418        return bol;
 419}
 420
 421static void *anonymize_ref_component(const void *old, size_t *len)
 422{
 423        static int counter;
 424        struct strbuf out = STRBUF_INIT;
 425        strbuf_addf(&out, "ref%d", counter++);
 426        return strbuf_detach(&out, len);
 427}
 428
 429static const char *anonymize_refname(const char *refname)
 430{
 431        /*
 432         * If any of these prefixes is found, we will leave it intact
 433         * so that tags remain tags and so forth.
 434         */
 435        static const char *prefixes[] = {
 436                "refs/heads/",
 437                "refs/tags/",
 438                "refs/remotes/",
 439                "refs/"
 440        };
 441        static struct hashmap refs;
 442        static struct strbuf anon = STRBUF_INIT;
 443        int i;
 444
 445        /*
 446         * We also leave "master" as a special case, since it does not reveal
 447         * anything interesting.
 448         */
 449        if (!strcmp(refname, "refs/heads/master"))
 450                return refname;
 451
 452        strbuf_reset(&anon);
 453        for (i = 0; i < ARRAY_SIZE(prefixes); i++) {
 454                if (skip_prefix(refname, prefixes[i], &refname)) {
 455                        strbuf_addstr(&anon, prefixes[i]);
 456                        break;
 457                }
 458        }
 459
 460        anonymize_path(&anon, refname, &refs, anonymize_ref_component);
 461        return anon.buf;
 462}
 463
 464/*
 465 * We do not even bother to cache commit messages, as they are unlikely
 466 * to be repeated verbatim, and it is not that interesting when they are.
 467 */
 468static char *anonymize_commit_message(const char *old)
 469{
 470        static int counter;
 471        return xstrfmt("subject %d\n\nbody\n", counter++);
 472}
 473
 474static struct hashmap idents;
 475static void *anonymize_ident(const void *old, size_t *len)
 476{
 477        static int counter;
 478        struct strbuf out = STRBUF_INIT;
 479        strbuf_addf(&out, "User %d <user%d@example.com>", counter, counter);
 480        counter++;
 481        return strbuf_detach(&out, len);
 482}
 483
 484/*
 485 * Our strategy here is to anonymize the names and email addresses,
 486 * but keep timestamps intact, as they influence things like traversal
 487 * order (and by themselves should not be too revealing).
 488 */
 489static void anonymize_ident_line(const char **beg, const char **end)
 490{
 491        static struct strbuf buffers[] = { STRBUF_INIT, STRBUF_INIT };
 492        static unsigned which_buffer;
 493
 494        struct strbuf *out;
 495        struct ident_split split;
 496        const char *end_of_header;
 497
 498        out = &buffers[which_buffer++];
 499        which_buffer %= ARRAY_SIZE(buffers);
 500        strbuf_reset(out);
 501
 502        /* skip "committer", "author", "tagger", etc */
 503        end_of_header = strchr(*beg, ' ');
 504        if (!end_of_header)
 505                die("BUG: malformed line fed to anonymize_ident_line: %.*s",
 506                    (int)(*end - *beg), *beg);
 507        end_of_header++;
 508        strbuf_add(out, *beg, end_of_header - *beg);
 509
 510        if (!split_ident_line(&split, end_of_header, *end - end_of_header) &&
 511            split.date_begin) {
 512                const char *ident;
 513                size_t len;
 514
 515                len = split.mail_end - split.name_begin;
 516                ident = anonymize_mem(&idents, anonymize_ident,
 517                                      split.name_begin, &len);
 518                strbuf_add(out, ident, len);
 519                strbuf_addch(out, ' ');
 520                strbuf_add(out, split.date_begin, split.tz_end - split.date_begin);
 521        } else {
 522                strbuf_addstr(out, "Malformed Ident <malformed@example.com> 0 -0000");
 523        }
 524
 525        *beg = out->buf;
 526        *end = out->buf + out->len;
 527}
 528
 529static void handle_commit(struct commit *commit, struct rev_info *rev)
 530{
 531        int saved_output_format = rev->diffopt.output_format;
 532        const char *commit_buffer;
 533        const char *author, *author_end, *committer, *committer_end;
 534        const char *encoding, *message;
 535        char *reencoded = NULL;
 536        struct commit_list *p;
 537        const char *refname;
 538        int i;
 539
 540        rev->diffopt.output_format = DIFF_FORMAT_CALLBACK;
 541
 542        parse_commit_or_die(commit);
 543        commit_buffer = get_commit_buffer(commit, NULL);
 544        author = strstr(commit_buffer, "\nauthor ");
 545        if (!author)
 546                die ("Could not find author in commit %s",
 547                     oid_to_hex(&commit->object.oid));
 548        author++;
 549        author_end = strchrnul(author, '\n');
 550        committer = strstr(author_end, "\ncommitter ");
 551        if (!committer)
 552                die ("Could not find committer in commit %s",
 553                     oid_to_hex(&commit->object.oid));
 554        committer++;
 555        committer_end = strchrnul(committer, '\n');
 556        message = strstr(committer_end, "\n\n");
 557        encoding = find_encoding(committer_end, message);
 558        if (message)
 559                message += 2;
 560
 561        if (commit->parents &&
 562            get_object_mark(&commit->parents->item->object) != 0 &&
 563            !full_tree) {
 564                parse_commit_or_die(commit->parents->item);
 565                diff_tree_sha1(commit->parents->item->tree->object.oid.hash,
 566                               commit->tree->object.oid.hash, "", &rev->diffopt);
 567        }
 568        else
 569                diff_root_tree_sha1(commit->tree->object.oid.hash,
 570                                    "", &rev->diffopt);
 571
 572        /* Export the referenced blobs, and remember the marks. */
 573        for (i = 0; i < diff_queued_diff.nr; i++)
 574                if (!S_ISGITLINK(diff_queued_diff.queue[i]->two->mode))
 575                        export_blob(diff_queued_diff.queue[i]->two->sha1);
 576
 577        refname = commit->util;
 578        if (anonymize) {
 579                refname = anonymize_refname(refname);
 580                anonymize_ident_line(&committer, &committer_end);
 581                anonymize_ident_line(&author, &author_end);
 582        }
 583
 584        mark_next_object(&commit->object);
 585        if (anonymize)
 586                reencoded = anonymize_commit_message(message);
 587        else if (!is_encoding_utf8(encoding))
 588                reencoded = reencode_string(message, "UTF-8", encoding);
 589        if (!commit->parents)
 590                printf("reset %s\n", refname);
 591        printf("commit %s\nmark :%"PRIu32"\n%.*s\n%.*s\ndata %u\n%s",
 592               refname, last_idnum,
 593               (int)(author_end - author), author,
 594               (int)(committer_end - committer), committer,
 595               (unsigned)(reencoded
 596                          ? strlen(reencoded) : message
 597                          ? strlen(message) : 0),
 598               reencoded ? reencoded : message ? message : "");
 599        free(reencoded);
 600        unuse_commit_buffer(commit, commit_buffer);
 601
 602        for (i = 0, p = commit->parents; p; p = p->next) {
 603                int mark = get_object_mark(&p->item->object);
 604                if (!mark)
 605                        continue;
 606                if (i == 0)
 607                        printf("from :%d\n", mark);
 608                else
 609                        printf("merge :%d\n", mark);
 610                i++;
 611        }
 612
 613        if (full_tree)
 614                printf("deleteall\n");
 615        log_tree_diff_flush(rev);
 616        rev->diffopt.output_format = saved_output_format;
 617
 618        printf("\n");
 619
 620        show_progress();
 621}
 622
 623static void *anonymize_tag(const void *old, size_t *len)
 624{
 625        static int counter;
 626        struct strbuf out = STRBUF_INIT;
 627        strbuf_addf(&out, "tag message %d", counter++);
 628        return strbuf_detach(&out, len);
 629}
 630
 631static void handle_tail(struct object_array *commits, struct rev_info *revs)
 632{
 633        struct commit *commit;
 634        while (commits->nr) {
 635                commit = (struct commit *)commits->objects[commits->nr - 1].item;
 636                if (has_unshown_parent(commit))
 637                        return;
 638                handle_commit(commit, revs);
 639                commits->nr--;
 640        }
 641}
 642
 643static void handle_tag(const char *name, struct tag *tag)
 644{
 645        unsigned long size;
 646        enum object_type type;
 647        char *buf;
 648        const char *tagger, *tagger_end, *message;
 649        size_t message_size = 0;
 650        struct object *tagged;
 651        int tagged_mark;
 652        struct commit *p;
 653
 654        /* Trees have no identifier in fast-export output, thus we have no way
 655         * to output tags of trees, tags of tags of trees, etc.  Simply omit
 656         * such tags.
 657         */
 658        tagged = tag->tagged;
 659        while (tagged->type == OBJ_TAG) {
 660                tagged = ((struct tag *)tagged)->tagged;
 661        }
 662        if (tagged->type == OBJ_TREE) {
 663                warning("Omitting tag %s,\nsince tags of trees (or tags of tags of trees, etc.) are not supported.",
 664                        oid_to_hex(&tag->object.oid));
 665                return;
 666        }
 667
 668        buf = read_sha1_file(tag->object.oid.hash, &type, &size);
 669        if (!buf)
 670                die ("Could not read tag %s", oid_to_hex(&tag->object.oid));
 671        message = memmem(buf, size, "\n\n", 2);
 672        if (message) {
 673                message += 2;
 674                message_size = strlen(message);
 675        }
 676        tagger = memmem(buf, message ? message - buf : size, "\ntagger ", 8);
 677        if (!tagger) {
 678                if (fake_missing_tagger)
 679                        tagger = "tagger Unspecified Tagger "
 680                                "<unspecified-tagger> 0 +0000";
 681                else
 682                        tagger = "";
 683                tagger_end = tagger + strlen(tagger);
 684        } else {
 685                tagger++;
 686                tagger_end = strchrnul(tagger, '\n');
 687                if (anonymize)
 688                        anonymize_ident_line(&tagger, &tagger_end);
 689        }
 690
 691        if (anonymize) {
 692                name = anonymize_refname(name);
 693                if (message) {
 694                        static struct hashmap tags;
 695                        message = anonymize_mem(&tags, anonymize_tag,
 696                                                message, &message_size);
 697                }
 698        }
 699
 700        /* handle signed tags */
 701        if (message) {
 702                const char *signature = strstr(message,
 703                                               "\n-----BEGIN PGP SIGNATURE-----\n");
 704                if (signature)
 705                        switch(signed_tag_mode) {
 706                        case ABORT:
 707                                die ("Encountered signed tag %s; use "
 708                                     "--signed-tags=<mode> to handle it.",
 709                                     oid_to_hex(&tag->object.oid));
 710                        case WARN:
 711                                warning ("Exporting signed tag %s",
 712                                         oid_to_hex(&tag->object.oid));
 713                                /* fallthru */
 714                        case VERBATIM:
 715                                break;
 716                        case WARN_STRIP:
 717                                warning ("Stripping signature from tag %s",
 718                                         oid_to_hex(&tag->object.oid));
 719                                /* fallthru */
 720                        case STRIP:
 721                                message_size = signature + 1 - message;
 722                                break;
 723                        }
 724        }
 725
 726        /* handle tag->tagged having been filtered out due to paths specified */
 727        tagged = tag->tagged;
 728        tagged_mark = get_object_mark(tagged);
 729        if (!tagged_mark) {
 730                switch(tag_of_filtered_mode) {
 731                case ABORT:
 732                        die ("Tag %s tags unexported object; use "
 733                             "--tag-of-filtered-object=<mode> to handle it.",
 734                             oid_to_hex(&tag->object.oid));
 735                case DROP:
 736                        /* Ignore this tag altogether */
 737                        return;
 738                case REWRITE:
 739                        if (tagged->type != OBJ_COMMIT) {
 740                                die ("Tag %s tags unexported %s!",
 741                                     oid_to_hex(&tag->object.oid),
 742                                     typename(tagged->type));
 743                        }
 744                        p = (struct commit *)tagged;
 745                        for (;;) {
 746                                if (p->parents && p->parents->next)
 747                                        break;
 748                                if (p->object.flags & UNINTERESTING)
 749                                        break;
 750                                if (!(p->object.flags & TREESAME))
 751                                        break;
 752                                if (!p->parents)
 753                                        die ("Can't find replacement commit for tag %s\n",
 754                                             oid_to_hex(&tag->object.oid));
 755                                p = p->parents->item;
 756                        }
 757                        tagged_mark = get_object_mark(&p->object);
 758                }
 759        }
 760
 761        if (starts_with(name, "refs/tags/"))
 762                name += 10;
 763        printf("tag %s\nfrom :%d\n%.*s%sdata %d\n%.*s\n",
 764               name, tagged_mark,
 765               (int)(tagger_end - tagger), tagger,
 766               tagger == tagger_end ? "" : "\n",
 767               (int)message_size, (int)message_size, message ? message : "");
 768}
 769
 770static struct commit *get_commit(struct rev_cmdline_entry *e, char *full_name)
 771{
 772        switch (e->item->type) {
 773        case OBJ_COMMIT:
 774                return (struct commit *)e->item;
 775        case OBJ_TAG: {
 776                struct tag *tag = (struct tag *)e->item;
 777
 778                /* handle nested tags */
 779                while (tag && tag->object.type == OBJ_TAG) {
 780                        parse_object(tag->object.oid.hash);
 781                        string_list_append(&extra_refs, full_name)->util = tag;
 782                        tag = (struct tag *)tag->tagged;
 783                }
 784                if (!tag)
 785                        die("Tag %s points nowhere?", e->name);
 786                return (struct commit *)tag;
 787                break;
 788        }
 789        default:
 790                return NULL;
 791        }
 792}
 793
 794static void get_tags_and_duplicates(struct rev_cmdline_info *info)
 795{
 796        int i;
 797
 798        for (i = 0; i < info->nr; i++) {
 799                struct rev_cmdline_entry *e = info->rev + i;
 800                unsigned char sha1[20];
 801                struct commit *commit;
 802                char *full_name;
 803
 804                if (e->flags & UNINTERESTING)
 805                        continue;
 806
 807                if (dwim_ref(e->name, strlen(e->name), sha1, &full_name) != 1)
 808                        continue;
 809
 810                if (refspecs) {
 811                        char *private;
 812                        private = apply_refspecs(refspecs, refspecs_nr, full_name);
 813                        if (private) {
 814                                free(full_name);
 815                                full_name = private;
 816                        }
 817                }
 818
 819                commit = get_commit(e, full_name);
 820                if (!commit) {
 821                        warning("%s: Unexpected object of type %s, skipping.",
 822                                e->name,
 823                                typename(e->item->type));
 824                        continue;
 825                }
 826
 827                switch(commit->object.type) {
 828                case OBJ_COMMIT:
 829                        break;
 830                case OBJ_BLOB:
 831                        export_blob(commit->object.oid.hash);
 832                        continue;
 833                default: /* OBJ_TAG (nested tags) is already handled */
 834                        warning("Tag points to object of unexpected type %s, skipping.",
 835                                typename(commit->object.type));
 836                        continue;
 837                }
 838
 839                /*
 840                 * This ref will not be updated through a commit, lets make
 841                 * sure it gets properly updated eventually.
 842                 */
 843                if (commit->util || commit->object.flags & SHOWN)
 844                        string_list_append(&extra_refs, full_name)->util = commit;
 845                if (!commit->util)
 846                        commit->util = full_name;
 847        }
 848}
 849
 850static void handle_tags_and_duplicates(void)
 851{
 852        struct commit *commit;
 853        int i;
 854
 855        for (i = extra_refs.nr - 1; i >= 0; i--) {
 856                const char *name = extra_refs.items[i].string;
 857                struct object *object = extra_refs.items[i].util;
 858                switch (object->type) {
 859                case OBJ_TAG:
 860                        handle_tag(name, (struct tag *)object);
 861                        break;
 862                case OBJ_COMMIT:
 863                        if (anonymize)
 864                                name = anonymize_refname(name);
 865                        /* create refs pointing to already seen commits */
 866                        commit = (struct commit *)object;
 867                        printf("reset %s\nfrom :%d\n\n", name,
 868                               get_object_mark(&commit->object));
 869                        show_progress();
 870                        break;
 871                }
 872        }
 873}
 874
 875static void export_marks(char *file)
 876{
 877        unsigned int i;
 878        uint32_t mark;
 879        struct object_decoration *deco = idnums.hash;
 880        FILE *f;
 881        int e = 0;
 882
 883        f = fopen_for_writing(file);
 884        if (!f)
 885                die_errno("Unable to open marks file %s for writing.", file);
 886
 887        for (i = 0; i < idnums.size; i++) {
 888                if (deco->base && deco->base->type == 1) {
 889                        mark = ptr_to_mark(deco->decoration);
 890                        if (fprintf(f, ":%"PRIu32" %s\n", mark,
 891                                oid_to_hex(&deco->base->oid)) < 0) {
 892                            e = 1;
 893                            break;
 894                        }
 895                }
 896                deco++;
 897        }
 898
 899        e |= ferror(f);
 900        e |= fclose(f);
 901        if (e)
 902                error("Unable to write marks file %s.", file);
 903}
 904
 905static void import_marks(char *input_file)
 906{
 907        char line[512];
 908        FILE *f = fopen(input_file, "r");
 909        if (!f)
 910                die_errno("cannot read '%s'", input_file);
 911
 912        while (fgets(line, sizeof(line), f)) {
 913                uint32_t mark;
 914                char *line_end, *mark_end;
 915                unsigned char sha1[20];
 916                struct object *object;
 917                struct commit *commit;
 918                enum object_type type;
 919
 920                line_end = strchr(line, '\n');
 921                if (line[0] != ':' || !line_end)
 922                        die("corrupt mark line: %s", line);
 923                *line_end = '\0';
 924
 925                mark = strtoumax(line + 1, &mark_end, 10);
 926                if (!mark || mark_end == line + 1
 927                        || *mark_end != ' ' || get_sha1_hex(mark_end + 1, sha1))
 928                        die("corrupt mark line: %s", line);
 929
 930                if (last_idnum < mark)
 931                        last_idnum = mark;
 932
 933                type = sha1_object_info(sha1, NULL);
 934                if (type < 0)
 935                        die("object not found: %s", sha1_to_hex(sha1));
 936
 937                if (type != OBJ_COMMIT)
 938                        /* only commits */
 939                        continue;
 940
 941                commit = lookup_commit(sha1);
 942                if (!commit)
 943                        die("not a commit? can't happen: %s", sha1_to_hex(sha1));
 944
 945                object = &commit->object;
 946
 947                if (object->flags & SHOWN)
 948                        error("Object %s already has a mark", sha1_to_hex(sha1));
 949
 950                mark_object(object, mark);
 951
 952                object->flags |= SHOWN;
 953        }
 954        fclose(f);
 955}
 956
 957static void handle_deletes(void)
 958{
 959        int i;
 960        for (i = 0; i < refspecs_nr; i++) {
 961                struct refspec *refspec = &refspecs[i];
 962                if (*refspec->src)
 963                        continue;
 964
 965                printf("reset %s\nfrom %s\n\n",
 966                                refspec->dst, sha1_to_hex(null_sha1));
 967        }
 968}
 969
 970int cmd_fast_export(int argc, const char **argv, const char *prefix)
 971{
 972        struct rev_info revs;
 973        struct object_array commits = OBJECT_ARRAY_INIT;
 974        struct commit *commit;
 975        char *export_filename = NULL, *import_filename = NULL;
 976        uint32_t lastimportid;
 977        struct string_list refspecs_list = STRING_LIST_INIT_NODUP;
 978        struct option options[] = {
 979                OPT_INTEGER(0, "progress", &progress,
 980                            N_("show progress after <n> objects")),
 981                OPT_CALLBACK(0, "signed-tags", &signed_tag_mode, N_("mode"),
 982                             N_("select handling of signed tags"),
 983                             parse_opt_signed_tag_mode),
 984                OPT_CALLBACK(0, "tag-of-filtered-object", &tag_of_filtered_mode, N_("mode"),
 985                             N_("select handling of tags that tag filtered objects"),
 986                             parse_opt_tag_of_filtered_mode),
 987                OPT_STRING(0, "export-marks", &export_filename, N_("file"),
 988                             N_("Dump marks to this file")),
 989                OPT_STRING(0, "import-marks", &import_filename, N_("file"),
 990                             N_("Import marks from this file")),
 991                OPT_BOOL(0, "fake-missing-tagger", &fake_missing_tagger,
 992                         N_("Fake a tagger when tags lack one")),
 993                OPT_BOOL(0, "full-tree", &full_tree,
 994                         N_("Output full tree for each commit")),
 995                OPT_BOOL(0, "use-done-feature", &use_done_feature,
 996                             N_("Use the done feature to terminate the stream")),
 997                OPT_BOOL(0, "no-data", &no_data, N_("Skip output of blob data")),
 998                OPT_STRING_LIST(0, "refspec", &refspecs_list, N_("refspec"),
 999                             N_("Apply refspec to exported refs")),
1000                OPT_BOOL(0, "anonymize", &anonymize, N_("anonymize output")),
1001                OPT_END()
1002        };
1003
1004        if (argc == 1)
1005                usage_with_options (fast_export_usage, options);
1006
1007        /* we handle encodings */
1008        git_config(git_default_config, NULL);
1009
1010        init_revisions(&revs, prefix);
1011        revs.topo_order = 1;
1012        revs.show_source = 1;
1013        revs.rewrite_parents = 1;
1014        argc = parse_options(argc, argv, prefix, options, fast_export_usage,
1015                        PARSE_OPT_KEEP_ARGV0 | PARSE_OPT_KEEP_UNKNOWN);
1016        argc = setup_revisions(argc, argv, &revs, NULL);
1017        if (argc > 1)
1018                usage_with_options (fast_export_usage, options);
1019
1020        if (refspecs_list.nr) {
1021                const char **refspecs_str;
1022                int i;
1023
1024                ALLOC_ARRAY(refspecs_str, refspecs_list.nr);
1025                for (i = 0; i < refspecs_list.nr; i++)
1026                        refspecs_str[i] = refspecs_list.items[i].string;
1027
1028                refspecs_nr = refspecs_list.nr;
1029                refspecs = parse_fetch_refspec(refspecs_nr, refspecs_str);
1030
1031                string_list_clear(&refspecs_list, 1);
1032                free(refspecs_str);
1033        }
1034
1035        if (use_done_feature)
1036                printf("feature done\n");
1037
1038        if (import_filename)
1039                import_marks(import_filename);
1040        lastimportid = last_idnum;
1041
1042        if (import_filename && revs.prune_data.nr)
1043                full_tree = 1;
1044
1045        get_tags_and_duplicates(&revs.cmdline);
1046
1047        if (prepare_revision_walk(&revs))
1048                die("revision walk setup failed");
1049        revs.diffopt.format_callback = show_filemodify;
1050        DIFF_OPT_SET(&revs.diffopt, RECURSIVE);
1051        while ((commit = get_revision(&revs))) {
1052                if (has_unshown_parent(commit)) {
1053                        add_object_array(&commit->object, NULL, &commits);
1054                }
1055                else {
1056                        handle_commit(commit, &revs);
1057                        handle_tail(&commits, &revs);
1058                }
1059        }
1060
1061        handle_tags_and_duplicates();
1062        handle_deletes();
1063
1064        if (export_filename && lastimportid != last_idnum)
1065                export_marks(export_filename);
1066
1067        if (use_done_feature)
1068                printf("done\n");
1069
1070        free_refspec(refspecs_nr, refspecs);
1071
1072        return 0;
1073}