refs.con commit Merge branch 'jk/pack-objects-optim-mru' (e6e24c9)
   1/*
   2 * The backend-independent part of the reference module.
   3 */
   4
   5#include "cache.h"
   6#include "lockfile.h"
   7#include "refs.h"
   8#include "refs/refs-internal.h"
   9#include "object.h"
  10#include "tag.h"
  11
  12/*
  13 * List of all available backends
  14 */
  15static struct ref_storage_be *refs_backends = &refs_be_files;
  16
  17static struct ref_storage_be *find_ref_storage_backend(const char *name)
  18{
  19        struct ref_storage_be *be;
  20        for (be = refs_backends; be; be = be->next)
  21                if (!strcmp(be->name, name))
  22                        return be;
  23        return NULL;
  24}
  25
  26int ref_storage_backend_exists(const char *name)
  27{
  28        return find_ref_storage_backend(name) != NULL;
  29}
  30
  31/*
  32 * How to handle various characters in refnames:
  33 * 0: An acceptable character for refs
  34 * 1: End-of-component
  35 * 2: ., look for a preceding . to reject .. in refs
  36 * 3: {, look for a preceding @ to reject @{ in refs
  37 * 4: A bad character: ASCII control characters, and
  38 *    ":", "?", "[", "\", "^", "~", SP, or TAB
  39 * 5: *, reject unless REFNAME_REFSPEC_PATTERN is set
  40 */
  41static unsigned char refname_disposition[256] = {
  42        1, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
  43        4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
  44        4, 0, 0, 0, 0, 0, 0, 0, 0, 0, 5, 0, 0, 0, 2, 1,
  45        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 4, 0, 0, 0, 0, 4,
  46        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  47        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 4, 4, 0, 4, 0,
  48        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  49        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 0, 0, 4, 4
  50};
  51
  52/*
  53 * Try to read one refname component from the front of refname.
  54 * Return the length of the component found, or -1 if the component is
  55 * not legal.  It is legal if it is something reasonable to have under
  56 * ".git/refs/"; We do not like it if:
  57 *
  58 * - any path component of it begins with ".", or
  59 * - it has double dots "..", or
  60 * - it has ASCII control characters, or
  61 * - it has ":", "?", "[", "\", "^", "~", SP, or TAB anywhere, or
  62 * - it has "*" anywhere unless REFNAME_REFSPEC_PATTERN is set, or
  63 * - it ends with a "/", or
  64 * - it ends with ".lock", or
  65 * - it contains a "@{" portion
  66 */
  67static int check_refname_component(const char *refname, int *flags)
  68{
  69        const char *cp;
  70        char last = '\0';
  71
  72        for (cp = refname; ; cp++) {
  73                int ch = *cp & 255;
  74                unsigned char disp = refname_disposition[ch];
  75                switch (disp) {
  76                case 1:
  77                        goto out;
  78                case 2:
  79                        if (last == '.')
  80                                return -1; /* Refname contains "..". */
  81                        break;
  82                case 3:
  83                        if (last == '@')
  84                                return -1; /* Refname contains "@{". */
  85                        break;
  86                case 4:
  87                        return -1;
  88                case 5:
  89                        if (!(*flags & REFNAME_REFSPEC_PATTERN))
  90                                return -1; /* refspec can't be a pattern */
  91
  92                        /*
  93                         * Unset the pattern flag so that we only accept
  94                         * a single asterisk for one side of refspec.
  95                         */
  96                        *flags &= ~ REFNAME_REFSPEC_PATTERN;
  97                        break;
  98                }
  99                last = ch;
 100        }
 101out:
 102        if (cp == refname)
 103                return 0; /* Component has zero length. */
 104        if (refname[0] == '.')
 105                return -1; /* Component starts with '.'. */
 106        if (cp - refname >= LOCK_SUFFIX_LEN &&
 107            !memcmp(cp - LOCK_SUFFIX_LEN, LOCK_SUFFIX, LOCK_SUFFIX_LEN))
 108                return -1; /* Refname ends with ".lock". */
 109        return cp - refname;
 110}
 111
 112int check_refname_format(const char *refname, int flags)
 113{
 114        int component_len, component_count = 0;
 115
 116        if (!strcmp(refname, "@"))
 117                /* Refname is a single character '@'. */
 118                return -1;
 119
 120        while (1) {
 121                /* We are at the start of a path component. */
 122                component_len = check_refname_component(refname, &flags);
 123                if (component_len <= 0)
 124                        return -1;
 125
 126                component_count++;
 127                if (refname[component_len] == '\0')
 128                        break;
 129                /* Skip to next component. */
 130                refname += component_len + 1;
 131        }
 132
 133        if (refname[component_len - 1] == '.')
 134                return -1; /* Refname ends with '.'. */
 135        if (!(flags & REFNAME_ALLOW_ONELEVEL) && component_count < 2)
 136                return -1; /* Refname has only one component. */
 137        return 0;
 138}
 139
 140int refname_is_safe(const char *refname)
 141{
 142        const char *rest;
 143
 144        if (skip_prefix(refname, "refs/", &rest)) {
 145                char *buf;
 146                int result;
 147                size_t restlen = strlen(rest);
 148
 149                /* rest must not be empty, or start or end with "/" */
 150                if (!restlen || *rest == '/' || rest[restlen - 1] == '/')
 151                        return 0;
 152
 153                /*
 154                 * Does the refname try to escape refs/?
 155                 * For example: refs/foo/../bar is safe but refs/foo/../../bar
 156                 * is not.
 157                 */
 158                buf = xmallocz(restlen);
 159                result = !normalize_path_copy(buf, rest) && !strcmp(buf, rest);
 160                free(buf);
 161                return result;
 162        }
 163
 164        do {
 165                if (!isupper(*refname) && *refname != '_')
 166                        return 0;
 167                refname++;
 168        } while (*refname);
 169        return 1;
 170}
 171
 172char *resolve_refdup(const char *refname, int resolve_flags,
 173                     unsigned char *sha1, int *flags)
 174{
 175        return xstrdup_or_null(resolve_ref_unsafe(refname, resolve_flags,
 176                                                  sha1, flags));
 177}
 178
 179/* The argument to filter_refs */
 180struct ref_filter {
 181        const char *pattern;
 182        each_ref_fn *fn;
 183        void *cb_data;
 184};
 185
 186int read_ref_full(const char *refname, int resolve_flags, unsigned char *sha1, int *flags)
 187{
 188        if (resolve_ref_unsafe(refname, resolve_flags, sha1, flags))
 189                return 0;
 190        return -1;
 191}
 192
 193int read_ref(const char *refname, unsigned char *sha1)
 194{
 195        return read_ref_full(refname, RESOLVE_REF_READING, sha1, NULL);
 196}
 197
 198int ref_exists(const char *refname)
 199{
 200        unsigned char sha1[20];
 201        return !!resolve_ref_unsafe(refname, RESOLVE_REF_READING, sha1, NULL);
 202}
 203
 204static int filter_refs(const char *refname, const struct object_id *oid,
 205                           int flags, void *data)
 206{
 207        struct ref_filter *filter = (struct ref_filter *)data;
 208
 209        if (wildmatch(filter->pattern, refname, 0, NULL))
 210                return 0;
 211        return filter->fn(refname, oid, flags, filter->cb_data);
 212}
 213
 214enum peel_status peel_object(const unsigned char *name, unsigned char *sha1)
 215{
 216        struct object *o = lookup_unknown_object(name);
 217
 218        if (o->type == OBJ_NONE) {
 219                int type = sha1_object_info(name, NULL);
 220                if (type < 0 || !object_as_type(o, type, 0))
 221                        return PEEL_INVALID;
 222        }
 223
 224        if (o->type != OBJ_TAG)
 225                return PEEL_NON_TAG;
 226
 227        o = deref_tag_noverify(o);
 228        if (!o)
 229                return PEEL_INVALID;
 230
 231        hashcpy(sha1, o->oid.hash);
 232        return PEEL_PEELED;
 233}
 234
 235struct warn_if_dangling_data {
 236        FILE *fp;
 237        const char *refname;
 238        const struct string_list *refnames;
 239        const char *msg_fmt;
 240};
 241
 242static int warn_if_dangling_symref(const char *refname, const struct object_id *oid,
 243                                   int flags, void *cb_data)
 244{
 245        struct warn_if_dangling_data *d = cb_data;
 246        const char *resolves_to;
 247        struct object_id junk;
 248
 249        if (!(flags & REF_ISSYMREF))
 250                return 0;
 251
 252        resolves_to = resolve_ref_unsafe(refname, 0, junk.hash, NULL);
 253        if (!resolves_to
 254            || (d->refname
 255                ? strcmp(resolves_to, d->refname)
 256                : !string_list_has_string(d->refnames, resolves_to))) {
 257                return 0;
 258        }
 259
 260        fprintf(d->fp, d->msg_fmt, refname);
 261        fputc('\n', d->fp);
 262        return 0;
 263}
 264
 265void warn_dangling_symref(FILE *fp, const char *msg_fmt, const char *refname)
 266{
 267        struct warn_if_dangling_data data;
 268
 269        data.fp = fp;
 270        data.refname = refname;
 271        data.refnames = NULL;
 272        data.msg_fmt = msg_fmt;
 273        for_each_rawref(warn_if_dangling_symref, &data);
 274}
 275
 276void warn_dangling_symrefs(FILE *fp, const char *msg_fmt, const struct string_list *refnames)
 277{
 278        struct warn_if_dangling_data data;
 279
 280        data.fp = fp;
 281        data.refname = NULL;
 282        data.refnames = refnames;
 283        data.msg_fmt = msg_fmt;
 284        for_each_rawref(warn_if_dangling_symref, &data);
 285}
 286
 287int for_each_tag_ref(each_ref_fn fn, void *cb_data)
 288{
 289        return for_each_ref_in("refs/tags/", fn, cb_data);
 290}
 291
 292int for_each_tag_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data)
 293{
 294        return for_each_ref_in_submodule(submodule, "refs/tags/", fn, cb_data);
 295}
 296
 297int for_each_branch_ref(each_ref_fn fn, void *cb_data)
 298{
 299        return for_each_ref_in("refs/heads/", fn, cb_data);
 300}
 301
 302int for_each_branch_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data)
 303{
 304        return for_each_ref_in_submodule(submodule, "refs/heads/", fn, cb_data);
 305}
 306
 307int for_each_remote_ref(each_ref_fn fn, void *cb_data)
 308{
 309        return for_each_ref_in("refs/remotes/", fn, cb_data);
 310}
 311
 312int for_each_remote_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data)
 313{
 314        return for_each_ref_in_submodule(submodule, "refs/remotes/", fn, cb_data);
 315}
 316
 317int head_ref_namespaced(each_ref_fn fn, void *cb_data)
 318{
 319        struct strbuf buf = STRBUF_INIT;
 320        int ret = 0;
 321        struct object_id oid;
 322        int flag;
 323
 324        strbuf_addf(&buf, "%sHEAD", get_git_namespace());
 325        if (!read_ref_full(buf.buf, RESOLVE_REF_READING, oid.hash, &flag))
 326                ret = fn(buf.buf, &oid, flag, cb_data);
 327        strbuf_release(&buf);
 328
 329        return ret;
 330}
 331
 332int for_each_glob_ref_in(each_ref_fn fn, const char *pattern,
 333        const char *prefix, void *cb_data)
 334{
 335        struct strbuf real_pattern = STRBUF_INIT;
 336        struct ref_filter filter;
 337        int ret;
 338
 339        if (!prefix && !starts_with(pattern, "refs/"))
 340                strbuf_addstr(&real_pattern, "refs/");
 341        else if (prefix)
 342                strbuf_addstr(&real_pattern, prefix);
 343        strbuf_addstr(&real_pattern, pattern);
 344
 345        if (!has_glob_specials(pattern)) {
 346                /* Append implied '/' '*' if not present. */
 347                strbuf_complete(&real_pattern, '/');
 348                /* No need to check for '*', there is none. */
 349                strbuf_addch(&real_pattern, '*');
 350        }
 351
 352        filter.pattern = real_pattern.buf;
 353        filter.fn = fn;
 354        filter.cb_data = cb_data;
 355        ret = for_each_ref(filter_refs, &filter);
 356
 357        strbuf_release(&real_pattern);
 358        return ret;
 359}
 360
 361int for_each_glob_ref(each_ref_fn fn, const char *pattern, void *cb_data)
 362{
 363        return for_each_glob_ref_in(fn, pattern, NULL, cb_data);
 364}
 365
 366const char *prettify_refname(const char *name)
 367{
 368        return name + (
 369                starts_with(name, "refs/heads/") ? 11 :
 370                starts_with(name, "refs/tags/") ? 10 :
 371                starts_with(name, "refs/remotes/") ? 13 :
 372                0);
 373}
 374
 375static const char *ref_rev_parse_rules[] = {
 376        "%.*s",
 377        "refs/%.*s",
 378        "refs/tags/%.*s",
 379        "refs/heads/%.*s",
 380        "refs/remotes/%.*s",
 381        "refs/remotes/%.*s/HEAD",
 382        NULL
 383};
 384
 385int refname_match(const char *abbrev_name, const char *full_name)
 386{
 387        const char **p;
 388        const int abbrev_name_len = strlen(abbrev_name);
 389
 390        for (p = ref_rev_parse_rules; *p; p++) {
 391                if (!strcmp(full_name, mkpath(*p, abbrev_name_len, abbrev_name))) {
 392                        return 1;
 393                }
 394        }
 395
 396        return 0;
 397}
 398
 399/*
 400 * *string and *len will only be substituted, and *string returned (for
 401 * later free()ing) if the string passed in is a magic short-hand form
 402 * to name a branch.
 403 */
 404static char *substitute_branch_name(const char **string, int *len)
 405{
 406        struct strbuf buf = STRBUF_INIT;
 407        int ret = interpret_branch_name(*string, *len, &buf);
 408
 409        if (ret == *len) {
 410                size_t size;
 411                *string = strbuf_detach(&buf, &size);
 412                *len = size;
 413                return (char *)*string;
 414        }
 415
 416        return NULL;
 417}
 418
 419int dwim_ref(const char *str, int len, unsigned char *sha1, char **ref)
 420{
 421        char *last_branch = substitute_branch_name(&str, &len);
 422        const char **p, *r;
 423        int refs_found = 0;
 424
 425        *ref = NULL;
 426        for (p = ref_rev_parse_rules; *p; p++) {
 427                char fullref[PATH_MAX];
 428                unsigned char sha1_from_ref[20];
 429                unsigned char *this_result;
 430                int flag;
 431
 432                this_result = refs_found ? sha1_from_ref : sha1;
 433                mksnpath(fullref, sizeof(fullref), *p, len, str);
 434                r = resolve_ref_unsafe(fullref, RESOLVE_REF_READING,
 435                                       this_result, &flag);
 436                if (r) {
 437                        if (!refs_found++)
 438                                *ref = xstrdup(r);
 439                        if (!warn_ambiguous_refs)
 440                                break;
 441                } else if ((flag & REF_ISSYMREF) && strcmp(fullref, "HEAD")) {
 442                        warning("ignoring dangling symref %s.", fullref);
 443                } else if ((flag & REF_ISBROKEN) && strchr(fullref, '/')) {
 444                        warning("ignoring broken ref %s.", fullref);
 445                }
 446        }
 447        free(last_branch);
 448        return refs_found;
 449}
 450
 451int dwim_log(const char *str, int len, unsigned char *sha1, char **log)
 452{
 453        char *last_branch = substitute_branch_name(&str, &len);
 454        const char **p;
 455        int logs_found = 0;
 456
 457        *log = NULL;
 458        for (p = ref_rev_parse_rules; *p; p++) {
 459                unsigned char hash[20];
 460                char path[PATH_MAX];
 461                const char *ref, *it;
 462
 463                mksnpath(path, sizeof(path), *p, len, str);
 464                ref = resolve_ref_unsafe(path, RESOLVE_REF_READING,
 465                                         hash, NULL);
 466                if (!ref)
 467                        continue;
 468                if (reflog_exists(path))
 469                        it = path;
 470                else if (strcmp(ref, path) && reflog_exists(ref))
 471                        it = ref;
 472                else
 473                        continue;
 474                if (!logs_found++) {
 475                        *log = xstrdup(it);
 476                        hashcpy(sha1, hash);
 477                }
 478                if (!warn_ambiguous_refs)
 479                        break;
 480        }
 481        free(last_branch);
 482        return logs_found;
 483}
 484
 485static int is_per_worktree_ref(const char *refname)
 486{
 487        return !strcmp(refname, "HEAD") ||
 488                starts_with(refname, "refs/bisect/");
 489}
 490
 491static int is_pseudoref_syntax(const char *refname)
 492{
 493        const char *c;
 494
 495        for (c = refname; *c; c++) {
 496                if (!isupper(*c) && *c != '-' && *c != '_')
 497                        return 0;
 498        }
 499
 500        return 1;
 501}
 502
 503enum ref_type ref_type(const char *refname)
 504{
 505        if (is_per_worktree_ref(refname))
 506                return REF_TYPE_PER_WORKTREE;
 507        if (is_pseudoref_syntax(refname))
 508                return REF_TYPE_PSEUDOREF;
 509       return REF_TYPE_NORMAL;
 510}
 511
 512static int write_pseudoref(const char *pseudoref, const unsigned char *sha1,
 513                           const unsigned char *old_sha1, struct strbuf *err)
 514{
 515        const char *filename;
 516        int fd;
 517        static struct lock_file lock;
 518        struct strbuf buf = STRBUF_INIT;
 519        int ret = -1;
 520
 521        strbuf_addf(&buf, "%s\n", sha1_to_hex(sha1));
 522
 523        filename = git_path("%s", pseudoref);
 524        fd = hold_lock_file_for_update(&lock, filename, LOCK_DIE_ON_ERROR);
 525        if (fd < 0) {
 526                strbuf_addf(err, "could not open '%s' for writing: %s",
 527                            filename, strerror(errno));
 528                return -1;
 529        }
 530
 531        if (old_sha1) {
 532                unsigned char actual_old_sha1[20];
 533
 534                if (read_ref(pseudoref, actual_old_sha1))
 535                        die("could not read ref '%s'", pseudoref);
 536                if (hashcmp(actual_old_sha1, old_sha1)) {
 537                        strbuf_addf(err, "unexpected sha1 when writing '%s'", pseudoref);
 538                        rollback_lock_file(&lock);
 539                        goto done;
 540                }
 541        }
 542
 543        if (write_in_full(fd, buf.buf, buf.len) != buf.len) {
 544                strbuf_addf(err, "could not write to '%s'", filename);
 545                rollback_lock_file(&lock);
 546                goto done;
 547        }
 548
 549        commit_lock_file(&lock);
 550        ret = 0;
 551done:
 552        strbuf_release(&buf);
 553        return ret;
 554}
 555
 556static int delete_pseudoref(const char *pseudoref, const unsigned char *old_sha1)
 557{
 558        static struct lock_file lock;
 559        const char *filename;
 560
 561        filename = git_path("%s", pseudoref);
 562
 563        if (old_sha1 && !is_null_sha1(old_sha1)) {
 564                int fd;
 565                unsigned char actual_old_sha1[20];
 566
 567                fd = hold_lock_file_for_update(&lock, filename,
 568                                               LOCK_DIE_ON_ERROR);
 569                if (fd < 0)
 570                        die_errno(_("Could not open '%s' for writing"), filename);
 571                if (read_ref(pseudoref, actual_old_sha1))
 572                        die("could not read ref '%s'", pseudoref);
 573                if (hashcmp(actual_old_sha1, old_sha1)) {
 574                        warning("Unexpected sha1 when deleting %s", pseudoref);
 575                        rollback_lock_file(&lock);
 576                        return -1;
 577                }
 578
 579                unlink(filename);
 580                rollback_lock_file(&lock);
 581        } else {
 582                unlink(filename);
 583        }
 584
 585        return 0;
 586}
 587
 588int delete_ref(const char *refname, const unsigned char *old_sha1,
 589               unsigned int flags)
 590{
 591        struct ref_transaction *transaction;
 592        struct strbuf err = STRBUF_INIT;
 593
 594        if (ref_type(refname) == REF_TYPE_PSEUDOREF)
 595                return delete_pseudoref(refname, old_sha1);
 596
 597        transaction = ref_transaction_begin(&err);
 598        if (!transaction ||
 599            ref_transaction_delete(transaction, refname, old_sha1,
 600                                   flags, NULL, &err) ||
 601            ref_transaction_commit(transaction, &err)) {
 602                error("%s", err.buf);
 603                ref_transaction_free(transaction);
 604                strbuf_release(&err);
 605                return 1;
 606        }
 607        ref_transaction_free(transaction);
 608        strbuf_release(&err);
 609        return 0;
 610}
 611
 612int copy_reflog_msg(char *buf, const char *msg)
 613{
 614        char *cp = buf;
 615        char c;
 616        int wasspace = 1;
 617
 618        *cp++ = '\t';
 619        while ((c = *msg++)) {
 620                if (wasspace && isspace(c))
 621                        continue;
 622                wasspace = isspace(c);
 623                if (wasspace)
 624                        c = ' ';
 625                *cp++ = c;
 626        }
 627        while (buf < cp && isspace(cp[-1]))
 628                cp--;
 629        *cp++ = '\n';
 630        return cp - buf;
 631}
 632
 633int should_autocreate_reflog(const char *refname)
 634{
 635        if (!log_all_ref_updates)
 636                return 0;
 637        return starts_with(refname, "refs/heads/") ||
 638                starts_with(refname, "refs/remotes/") ||
 639                starts_with(refname, "refs/notes/") ||
 640                !strcmp(refname, "HEAD");
 641}
 642
 643int is_branch(const char *refname)
 644{
 645        return !strcmp(refname, "HEAD") || starts_with(refname, "refs/heads/");
 646}
 647
 648struct read_ref_at_cb {
 649        const char *refname;
 650        unsigned long at_time;
 651        int cnt;
 652        int reccnt;
 653        unsigned char *sha1;
 654        int found_it;
 655
 656        unsigned char osha1[20];
 657        unsigned char nsha1[20];
 658        int tz;
 659        unsigned long date;
 660        char **msg;
 661        unsigned long *cutoff_time;
 662        int *cutoff_tz;
 663        int *cutoff_cnt;
 664};
 665
 666static int read_ref_at_ent(unsigned char *osha1, unsigned char *nsha1,
 667                const char *email, unsigned long timestamp, int tz,
 668                const char *message, void *cb_data)
 669{
 670        struct read_ref_at_cb *cb = cb_data;
 671
 672        cb->reccnt++;
 673        cb->tz = tz;
 674        cb->date = timestamp;
 675
 676        if (timestamp <= cb->at_time || cb->cnt == 0) {
 677                if (cb->msg)
 678                        *cb->msg = xstrdup(message);
 679                if (cb->cutoff_time)
 680                        *cb->cutoff_time = timestamp;
 681                if (cb->cutoff_tz)
 682                        *cb->cutoff_tz = tz;
 683                if (cb->cutoff_cnt)
 684                        *cb->cutoff_cnt = cb->reccnt - 1;
 685                /*
 686                 * we have not yet updated cb->[n|o]sha1 so they still
 687                 * hold the values for the previous record.
 688                 */
 689                if (!is_null_sha1(cb->osha1)) {
 690                        hashcpy(cb->sha1, nsha1);
 691                        if (hashcmp(cb->osha1, nsha1))
 692                                warning("Log for ref %s has gap after %s.",
 693                                        cb->refname, show_date(cb->date, cb->tz, DATE_MODE(RFC2822)));
 694                }
 695                else if (cb->date == cb->at_time)
 696                        hashcpy(cb->sha1, nsha1);
 697                else if (hashcmp(nsha1, cb->sha1))
 698                        warning("Log for ref %s unexpectedly ended on %s.",
 699                                cb->refname, show_date(cb->date, cb->tz,
 700                                                       DATE_MODE(RFC2822)));
 701                hashcpy(cb->osha1, osha1);
 702                hashcpy(cb->nsha1, nsha1);
 703                cb->found_it = 1;
 704                return 1;
 705        }
 706        hashcpy(cb->osha1, osha1);
 707        hashcpy(cb->nsha1, nsha1);
 708        if (cb->cnt > 0)
 709                cb->cnt--;
 710        return 0;
 711}
 712
 713static int read_ref_at_ent_oldest(unsigned char *osha1, unsigned char *nsha1,
 714                                  const char *email, unsigned long timestamp,
 715                                  int tz, const char *message, void *cb_data)
 716{
 717        struct read_ref_at_cb *cb = cb_data;
 718
 719        if (cb->msg)
 720                *cb->msg = xstrdup(message);
 721        if (cb->cutoff_time)
 722                *cb->cutoff_time = timestamp;
 723        if (cb->cutoff_tz)
 724                *cb->cutoff_tz = tz;
 725        if (cb->cutoff_cnt)
 726                *cb->cutoff_cnt = cb->reccnt;
 727        hashcpy(cb->sha1, osha1);
 728        if (is_null_sha1(cb->sha1))
 729                hashcpy(cb->sha1, nsha1);
 730        /* We just want the first entry */
 731        return 1;
 732}
 733
 734int read_ref_at(const char *refname, unsigned int flags, unsigned long at_time, int cnt,
 735                unsigned char *sha1, char **msg,
 736                unsigned long *cutoff_time, int *cutoff_tz, int *cutoff_cnt)
 737{
 738        struct read_ref_at_cb cb;
 739
 740        memset(&cb, 0, sizeof(cb));
 741        cb.refname = refname;
 742        cb.at_time = at_time;
 743        cb.cnt = cnt;
 744        cb.msg = msg;
 745        cb.cutoff_time = cutoff_time;
 746        cb.cutoff_tz = cutoff_tz;
 747        cb.cutoff_cnt = cutoff_cnt;
 748        cb.sha1 = sha1;
 749
 750        for_each_reflog_ent_reverse(refname, read_ref_at_ent, &cb);
 751
 752        if (!cb.reccnt) {
 753                if (flags & GET_SHA1_QUIETLY)
 754                        exit(128);
 755                else
 756                        die("Log for %s is empty.", refname);
 757        }
 758        if (cb.found_it)
 759                return 0;
 760
 761        for_each_reflog_ent(refname, read_ref_at_ent_oldest, &cb);
 762
 763        return 1;
 764}
 765
 766struct ref_transaction *ref_transaction_begin(struct strbuf *err)
 767{
 768        assert(err);
 769
 770        return xcalloc(1, sizeof(struct ref_transaction));
 771}
 772
 773void ref_transaction_free(struct ref_transaction *transaction)
 774{
 775        int i;
 776
 777        if (!transaction)
 778                return;
 779
 780        for (i = 0; i < transaction->nr; i++) {
 781                free(transaction->updates[i]->msg);
 782                free(transaction->updates[i]);
 783        }
 784        free(transaction->updates);
 785        free(transaction);
 786}
 787
 788struct ref_update *ref_transaction_add_update(
 789                struct ref_transaction *transaction,
 790                const char *refname, unsigned int flags,
 791                const unsigned char *new_sha1,
 792                const unsigned char *old_sha1,
 793                const char *msg)
 794{
 795        struct ref_update *update;
 796
 797        if (transaction->state != REF_TRANSACTION_OPEN)
 798                die("BUG: update called for transaction that is not open");
 799
 800        if ((flags & REF_ISPRUNING) && !(flags & REF_NODEREF))
 801                die("BUG: REF_ISPRUNING set without REF_NODEREF");
 802
 803        FLEX_ALLOC_STR(update, refname, refname);
 804        ALLOC_GROW(transaction->updates, transaction->nr + 1, transaction->alloc);
 805        transaction->updates[transaction->nr++] = update;
 806
 807        update->flags = flags;
 808
 809        if (flags & REF_HAVE_NEW)
 810                hashcpy(update->new_sha1, new_sha1);
 811        if (flags & REF_HAVE_OLD)
 812                hashcpy(update->old_sha1, old_sha1);
 813        if (msg)
 814                update->msg = xstrdup(msg);
 815        return update;
 816}
 817
 818int ref_transaction_update(struct ref_transaction *transaction,
 819                           const char *refname,
 820                           const unsigned char *new_sha1,
 821                           const unsigned char *old_sha1,
 822                           unsigned int flags, const char *msg,
 823                           struct strbuf *err)
 824{
 825        assert(err);
 826
 827        if ((new_sha1 && !is_null_sha1(new_sha1)) ?
 828            check_refname_format(refname, REFNAME_ALLOW_ONELEVEL) :
 829            !refname_is_safe(refname)) {
 830                strbuf_addf(err, "refusing to update ref with bad name '%s'",
 831                            refname);
 832                return -1;
 833        }
 834
 835        flags |= (new_sha1 ? REF_HAVE_NEW : 0) | (old_sha1 ? REF_HAVE_OLD : 0);
 836
 837        ref_transaction_add_update(transaction, refname, flags,
 838                                   new_sha1, old_sha1, msg);
 839        return 0;
 840}
 841
 842int ref_transaction_create(struct ref_transaction *transaction,
 843                           const char *refname,
 844                           const unsigned char *new_sha1,
 845                           unsigned int flags, const char *msg,
 846                           struct strbuf *err)
 847{
 848        if (!new_sha1 || is_null_sha1(new_sha1))
 849                die("BUG: create called without valid new_sha1");
 850        return ref_transaction_update(transaction, refname, new_sha1,
 851                                      null_sha1, flags, msg, err);
 852}
 853
 854int ref_transaction_delete(struct ref_transaction *transaction,
 855                           const char *refname,
 856                           const unsigned char *old_sha1,
 857                           unsigned int flags, const char *msg,
 858                           struct strbuf *err)
 859{
 860        if (old_sha1 && is_null_sha1(old_sha1))
 861                die("BUG: delete called with old_sha1 set to zeros");
 862        return ref_transaction_update(transaction, refname,
 863                                      null_sha1, old_sha1,
 864                                      flags, msg, err);
 865}
 866
 867int ref_transaction_verify(struct ref_transaction *transaction,
 868                           const char *refname,
 869                           const unsigned char *old_sha1,
 870                           unsigned int flags,
 871                           struct strbuf *err)
 872{
 873        if (!old_sha1)
 874                die("BUG: verify called with old_sha1 set to NULL");
 875        return ref_transaction_update(transaction, refname,
 876                                      NULL, old_sha1,
 877                                      flags, NULL, err);
 878}
 879
 880int update_ref_oid(const char *msg, const char *refname,
 881               const struct object_id *new_oid, const struct object_id *old_oid,
 882               unsigned int flags, enum action_on_err onerr)
 883{
 884        return update_ref(msg, refname, new_oid ? new_oid->hash : NULL,
 885                old_oid ? old_oid->hash : NULL, flags, onerr);
 886}
 887
 888int update_ref(const char *msg, const char *refname,
 889               const unsigned char *new_sha1, const unsigned char *old_sha1,
 890               unsigned int flags, enum action_on_err onerr)
 891{
 892        struct ref_transaction *t = NULL;
 893        struct strbuf err = STRBUF_INIT;
 894        int ret = 0;
 895
 896        if (ref_type(refname) == REF_TYPE_PSEUDOREF) {
 897                ret = write_pseudoref(refname, new_sha1, old_sha1, &err);
 898        } else {
 899                t = ref_transaction_begin(&err);
 900                if (!t ||
 901                    ref_transaction_update(t, refname, new_sha1, old_sha1,
 902                                           flags, msg, &err) ||
 903                    ref_transaction_commit(t, &err)) {
 904                        ret = 1;
 905                        ref_transaction_free(t);
 906                }
 907        }
 908        if (ret) {
 909                const char *str = "update_ref failed for ref '%s': %s";
 910
 911                switch (onerr) {
 912                case UPDATE_REFS_MSG_ON_ERR:
 913                        error(str, refname, err.buf);
 914                        break;
 915                case UPDATE_REFS_DIE_ON_ERR:
 916                        die(str, refname, err.buf);
 917                        break;
 918                case UPDATE_REFS_QUIET_ON_ERR:
 919                        break;
 920                }
 921                strbuf_release(&err);
 922                return 1;
 923        }
 924        strbuf_release(&err);
 925        if (t)
 926                ref_transaction_free(t);
 927        return 0;
 928}
 929
 930char *shorten_unambiguous_ref(const char *refname, int strict)
 931{
 932        int i;
 933        static char **scanf_fmts;
 934        static int nr_rules;
 935        char *short_name;
 936
 937        if (!nr_rules) {
 938                /*
 939                 * Pre-generate scanf formats from ref_rev_parse_rules[].
 940                 * Generate a format suitable for scanf from a
 941                 * ref_rev_parse_rules rule by interpolating "%s" at the
 942                 * location of the "%.*s".
 943                 */
 944                size_t total_len = 0;
 945                size_t offset = 0;
 946
 947                /* the rule list is NULL terminated, count them first */
 948                for (nr_rules = 0; ref_rev_parse_rules[nr_rules]; nr_rules++)
 949                        /* -2 for strlen("%.*s") - strlen("%s"); +1 for NUL */
 950                        total_len += strlen(ref_rev_parse_rules[nr_rules]) - 2 + 1;
 951
 952                scanf_fmts = xmalloc(st_add(st_mult(sizeof(char *), nr_rules), total_len));
 953
 954                offset = 0;
 955                for (i = 0; i < nr_rules; i++) {
 956                        assert(offset < total_len);
 957                        scanf_fmts[i] = (char *)&scanf_fmts[nr_rules] + offset;
 958                        offset += snprintf(scanf_fmts[i], total_len - offset,
 959                                           ref_rev_parse_rules[i], 2, "%s") + 1;
 960                }
 961        }
 962
 963        /* bail out if there are no rules */
 964        if (!nr_rules)
 965                return xstrdup(refname);
 966
 967        /* buffer for scanf result, at most refname must fit */
 968        short_name = xstrdup(refname);
 969
 970        /* skip first rule, it will always match */
 971        for (i = nr_rules - 1; i > 0 ; --i) {
 972                int j;
 973                int rules_to_fail = i;
 974                int short_name_len;
 975
 976                if (1 != sscanf(refname, scanf_fmts[i], short_name))
 977                        continue;
 978
 979                short_name_len = strlen(short_name);
 980
 981                /*
 982                 * in strict mode, all (except the matched one) rules
 983                 * must fail to resolve to a valid non-ambiguous ref
 984                 */
 985                if (strict)
 986                        rules_to_fail = nr_rules;
 987
 988                /*
 989                 * check if the short name resolves to a valid ref,
 990                 * but use only rules prior to the matched one
 991                 */
 992                for (j = 0; j < rules_to_fail; j++) {
 993                        const char *rule = ref_rev_parse_rules[j];
 994                        char refname[PATH_MAX];
 995
 996                        /* skip matched rule */
 997                        if (i == j)
 998                                continue;
 999
1000                        /*
1001                         * the short name is ambiguous, if it resolves
1002                         * (with this previous rule) to a valid ref
1003                         * read_ref() returns 0 on success
1004                         */
1005                        mksnpath(refname, sizeof(refname),
1006                                 rule, short_name_len, short_name);
1007                        if (ref_exists(refname))
1008                                break;
1009                }
1010
1011                /*
1012                 * short name is non-ambiguous if all previous rules
1013                 * haven't resolved to a valid ref
1014                 */
1015                if (j == rules_to_fail)
1016                        return short_name;
1017        }
1018
1019        free(short_name);
1020        return xstrdup(refname);
1021}
1022
1023static struct string_list *hide_refs;
1024
1025int parse_hide_refs_config(const char *var, const char *value, const char *section)
1026{
1027        if (!strcmp("transfer.hiderefs", var) ||
1028            /* NEEDSWORK: use parse_config_key() once both are merged */
1029            (starts_with(var, section) && var[strlen(section)] == '.' &&
1030             !strcmp(var + strlen(section), ".hiderefs"))) {
1031                char *ref;
1032                int len;
1033
1034                if (!value)
1035                        return config_error_nonbool(var);
1036                ref = xstrdup(value);
1037                len = strlen(ref);
1038                while (len && ref[len - 1] == '/')
1039                        ref[--len] = '\0';
1040                if (!hide_refs) {
1041                        hide_refs = xcalloc(1, sizeof(*hide_refs));
1042                        hide_refs->strdup_strings = 1;
1043                }
1044                string_list_append(hide_refs, ref);
1045        }
1046        return 0;
1047}
1048
1049int ref_is_hidden(const char *refname, const char *refname_full)
1050{
1051        int i;
1052
1053        if (!hide_refs)
1054                return 0;
1055        for (i = hide_refs->nr - 1; i >= 0; i--) {
1056                const char *match = hide_refs->items[i].string;
1057                const char *subject;
1058                int neg = 0;
1059                int len;
1060
1061                if (*match == '!') {
1062                        neg = 1;
1063                        match++;
1064                }
1065
1066                if (*match == '^') {
1067                        subject = refname_full;
1068                        match++;
1069                } else {
1070                        subject = refname;
1071                }
1072
1073                /* refname can be NULL when namespaces are used. */
1074                if (!subject || !starts_with(subject, match))
1075                        continue;
1076                len = strlen(match);
1077                if (!subject[len] || subject[len] == '/')
1078                        return !neg;
1079        }
1080        return 0;
1081}
1082
1083const char *find_descendant_ref(const char *dirname,
1084                                const struct string_list *extras,
1085                                const struct string_list *skip)
1086{
1087        int pos;
1088
1089        if (!extras)
1090                return NULL;
1091
1092        /*
1093         * Look at the place where dirname would be inserted into
1094         * extras. If there is an entry at that position that starts
1095         * with dirname (remember, dirname includes the trailing
1096         * slash) and is not in skip, then we have a conflict.
1097         */
1098        for (pos = string_list_find_insert_index(extras, dirname, 0);
1099             pos < extras->nr; pos++) {
1100                const char *extra_refname = extras->items[pos].string;
1101
1102                if (!starts_with(extra_refname, dirname))
1103                        break;
1104
1105                if (!skip || !string_list_has_string(skip, extra_refname))
1106                        return extra_refname;
1107        }
1108        return NULL;
1109}
1110
1111int rename_ref_available(const char *old_refname, const char *new_refname)
1112{
1113        struct string_list skip = STRING_LIST_INIT_NODUP;
1114        struct strbuf err = STRBUF_INIT;
1115        int ok;
1116
1117        string_list_insert(&skip, old_refname);
1118        ok = !verify_refname_available(new_refname, NULL, &skip, &err);
1119        if (!ok)
1120                error("%s", err.buf);
1121
1122        string_list_clear(&skip, 0);
1123        strbuf_release(&err);
1124        return ok;
1125}
1126
1127int head_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data)
1128{
1129        struct object_id oid;
1130        int flag;
1131
1132        if (submodule) {
1133                if (resolve_gitlink_ref(submodule, "HEAD", oid.hash) == 0)
1134                        return fn("HEAD", &oid, 0, cb_data);
1135
1136                return 0;
1137        }
1138
1139        if (!read_ref_full("HEAD", RESOLVE_REF_READING, oid.hash, &flag))
1140                return fn("HEAD", &oid, flag, cb_data);
1141
1142        return 0;
1143}
1144
1145int head_ref(each_ref_fn fn, void *cb_data)
1146{
1147        return head_ref_submodule(NULL, fn, cb_data);
1148}
1149
1150/*
1151 * Call fn for each reference in the specified submodule for which the
1152 * refname begins with prefix. If trim is non-zero, then trim that
1153 * many characters off the beginning of each refname before passing
1154 * the refname to fn. flags can be DO_FOR_EACH_INCLUDE_BROKEN to
1155 * include broken references in the iteration. If fn ever returns a
1156 * non-zero value, stop the iteration and return that value;
1157 * otherwise, return 0.
1158 */
1159static int do_for_each_ref(const char *submodule, const char *prefix,
1160                           each_ref_fn fn, int trim, int flags, void *cb_data)
1161{
1162        struct ref_store *refs = get_ref_store(submodule);
1163        struct ref_iterator *iter;
1164
1165        if (!refs)
1166                return 0;
1167
1168        iter = refs->be->iterator_begin(refs, prefix, flags);
1169        iter = prefix_ref_iterator_begin(iter, prefix, trim);
1170
1171        return do_for_each_ref_iterator(iter, fn, cb_data);
1172}
1173
1174int for_each_ref(each_ref_fn fn, void *cb_data)
1175{
1176        return do_for_each_ref(NULL, "", fn, 0, 0, cb_data);
1177}
1178
1179int for_each_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data)
1180{
1181        return do_for_each_ref(submodule, "", fn, 0, 0, cb_data);
1182}
1183
1184int for_each_ref_in(const char *prefix, each_ref_fn fn, void *cb_data)
1185{
1186        return do_for_each_ref(NULL, prefix, fn, strlen(prefix), 0, cb_data);
1187}
1188
1189int for_each_fullref_in(const char *prefix, each_ref_fn fn, void *cb_data, unsigned int broken)
1190{
1191        unsigned int flag = 0;
1192
1193        if (broken)
1194                flag = DO_FOR_EACH_INCLUDE_BROKEN;
1195        return do_for_each_ref(NULL, prefix, fn, 0, flag, cb_data);
1196}
1197
1198int for_each_ref_in_submodule(const char *submodule, const char *prefix,
1199                each_ref_fn fn, void *cb_data)
1200{
1201        return do_for_each_ref(submodule, prefix, fn, strlen(prefix), 0, cb_data);
1202}
1203
1204int for_each_replace_ref(each_ref_fn fn, void *cb_data)
1205{
1206        return do_for_each_ref(NULL, git_replace_ref_base, fn,
1207                               strlen(git_replace_ref_base), 0, cb_data);
1208}
1209
1210int for_each_namespaced_ref(each_ref_fn fn, void *cb_data)
1211{
1212        struct strbuf buf = STRBUF_INIT;
1213        int ret;
1214        strbuf_addf(&buf, "%srefs/", get_git_namespace());
1215        ret = do_for_each_ref(NULL, buf.buf, fn, 0, 0, cb_data);
1216        strbuf_release(&buf);
1217        return ret;
1218}
1219
1220int for_each_rawref(each_ref_fn fn, void *cb_data)
1221{
1222        return do_for_each_ref(NULL, "", fn, 0,
1223                               DO_FOR_EACH_INCLUDE_BROKEN, cb_data);
1224}
1225
1226/* This function needs to return a meaningful errno on failure */
1227static const char *resolve_ref_recursively(struct ref_store *refs,
1228                                           const char *refname,
1229                                           int resolve_flags,
1230                                           unsigned char *sha1, int *flags)
1231{
1232        static struct strbuf sb_refname = STRBUF_INIT;
1233        int unused_flags;
1234        int symref_count;
1235
1236        if (!flags)
1237                flags = &unused_flags;
1238
1239        *flags = 0;
1240
1241        if (check_refname_format(refname, REFNAME_ALLOW_ONELEVEL)) {
1242                if (!(resolve_flags & RESOLVE_REF_ALLOW_BAD_NAME) ||
1243                    !refname_is_safe(refname)) {
1244                        errno = EINVAL;
1245                        return NULL;
1246                }
1247
1248                /*
1249                 * dwim_ref() uses REF_ISBROKEN to distinguish between
1250                 * missing refs and refs that were present but invalid,
1251                 * to complain about the latter to stderr.
1252                 *
1253                 * We don't know whether the ref exists, so don't set
1254                 * REF_ISBROKEN yet.
1255                 */
1256                *flags |= REF_BAD_NAME;
1257        }
1258
1259        for (symref_count = 0; symref_count < SYMREF_MAXDEPTH; symref_count++) {
1260                unsigned int read_flags = 0;
1261
1262                if (refs->be->read_raw_ref(refs, refname,
1263                                           sha1, &sb_refname, &read_flags)) {
1264                        *flags |= read_flags;
1265                        if (errno != ENOENT || (resolve_flags & RESOLVE_REF_READING))
1266                                return NULL;
1267                        hashclr(sha1);
1268                        if (*flags & REF_BAD_NAME)
1269                                *flags |= REF_ISBROKEN;
1270                        return refname;
1271                }
1272
1273                *flags |= read_flags;
1274
1275                if (!(read_flags & REF_ISSYMREF)) {
1276                        if (*flags & REF_BAD_NAME) {
1277                                hashclr(sha1);
1278                                *flags |= REF_ISBROKEN;
1279                        }
1280                        return refname;
1281                }
1282
1283                refname = sb_refname.buf;
1284                if (resolve_flags & RESOLVE_REF_NO_RECURSE) {
1285                        hashclr(sha1);
1286                        return refname;
1287                }
1288                if (check_refname_format(refname, REFNAME_ALLOW_ONELEVEL)) {
1289                        if (!(resolve_flags & RESOLVE_REF_ALLOW_BAD_NAME) ||
1290                            !refname_is_safe(refname)) {
1291                                errno = EINVAL;
1292                                return NULL;
1293                        }
1294
1295                        *flags |= REF_ISBROKEN | REF_BAD_NAME;
1296                }
1297        }
1298
1299        errno = ELOOP;
1300        return NULL;
1301}
1302
1303/* backend functions */
1304int refs_init_db(struct strbuf *err)
1305{
1306        struct ref_store *refs = get_ref_store(NULL);
1307
1308        return refs->be->init_db(refs, err);
1309}
1310
1311const char *resolve_ref_unsafe(const char *refname, int resolve_flags,
1312                               unsigned char *sha1, int *flags)
1313{
1314        return resolve_ref_recursively(get_ref_store(NULL), refname,
1315                                       resolve_flags, sha1, flags);
1316}
1317
1318int resolve_gitlink_ref(const char *submodule, const char *refname,
1319                        unsigned char *sha1)
1320{
1321        size_t len = strlen(submodule);
1322        struct ref_store *refs;
1323        int flags;
1324
1325        while (len && submodule[len - 1] == '/')
1326                len--;
1327
1328        if (!len)
1329                return -1;
1330
1331        if (submodule[len]) {
1332                /* We need to strip off one or more trailing slashes */
1333                char *stripped = xmemdupz(submodule, len);
1334
1335                refs = get_ref_store(stripped);
1336                free(stripped);
1337        } else {
1338                refs = get_ref_store(submodule);
1339        }
1340
1341        if (!refs)
1342                return -1;
1343
1344        if (!resolve_ref_recursively(refs, refname, 0, sha1, &flags) ||
1345            is_null_sha1(sha1))
1346                return -1;
1347        return 0;
1348}
1349
1350/* A pointer to the ref_store for the main repository: */
1351static struct ref_store *main_ref_store;
1352
1353/* A linked list of ref_stores for submodules: */
1354static struct ref_store *submodule_ref_stores;
1355
1356void base_ref_store_init(struct ref_store *refs,
1357                         const struct ref_storage_be *be,
1358                         const char *submodule)
1359{
1360        refs->be = be;
1361        if (!submodule) {
1362                if (main_ref_store)
1363                        die("BUG: main_ref_store initialized twice");
1364
1365                refs->submodule = "";
1366                refs->next = NULL;
1367                main_ref_store = refs;
1368        } else {
1369                if (lookup_ref_store(submodule))
1370                        die("BUG: ref_store for submodule '%s' initialized twice",
1371                            submodule);
1372
1373                refs->submodule = xstrdup(submodule);
1374                refs->next = submodule_ref_stores;
1375                submodule_ref_stores = refs;
1376        }
1377}
1378
1379struct ref_store *ref_store_init(const char *submodule)
1380{
1381        const char *be_name = "files";
1382        struct ref_storage_be *be = find_ref_storage_backend(be_name);
1383
1384        if (!be)
1385                die("BUG: reference backend %s is unknown", be_name);
1386
1387        if (!submodule || !*submodule)
1388                return be->init(NULL);
1389        else
1390                return be->init(submodule);
1391}
1392
1393struct ref_store *lookup_ref_store(const char *submodule)
1394{
1395        struct ref_store *refs;
1396
1397        if (!submodule || !*submodule)
1398                return main_ref_store;
1399
1400        for (refs = submodule_ref_stores; refs; refs = refs->next) {
1401                if (!strcmp(submodule, refs->submodule))
1402                        return refs;
1403        }
1404
1405        return NULL;
1406}
1407
1408struct ref_store *get_ref_store(const char *submodule)
1409{
1410        struct ref_store *refs;
1411
1412        if (!submodule || !*submodule) {
1413                refs = lookup_ref_store(NULL);
1414
1415                if (!refs)
1416                        refs = ref_store_init(NULL);
1417        } else {
1418                refs = lookup_ref_store(submodule);
1419
1420                if (!refs) {
1421                        struct strbuf submodule_sb = STRBUF_INIT;
1422
1423                        strbuf_addstr(&submodule_sb, submodule);
1424                        if (is_nonbare_repository_dir(&submodule_sb))
1425                                refs = ref_store_init(submodule);
1426                        strbuf_release(&submodule_sb);
1427                }
1428        }
1429
1430        return refs;
1431}
1432
1433void assert_main_repository(struct ref_store *refs, const char *caller)
1434{
1435        if (*refs->submodule)
1436                die("BUG: %s called for a submodule", caller);
1437}
1438
1439/* backend functions */
1440int pack_refs(unsigned int flags)
1441{
1442        struct ref_store *refs = get_ref_store(NULL);
1443
1444        return refs->be->pack_refs(refs, flags);
1445}
1446
1447int peel_ref(const char *refname, unsigned char *sha1)
1448{
1449        struct ref_store *refs = get_ref_store(NULL);
1450
1451        return refs->be->peel_ref(refs, refname, sha1);
1452}
1453
1454int create_symref(const char *ref_target, const char *refs_heads_master,
1455                  const char *logmsg)
1456{
1457        struct ref_store *refs = get_ref_store(NULL);
1458
1459        return refs->be->create_symref(refs, ref_target, refs_heads_master,
1460                                       logmsg);
1461}
1462
1463int ref_transaction_commit(struct ref_transaction *transaction,
1464                           struct strbuf *err)
1465{
1466        struct ref_store *refs = get_ref_store(NULL);
1467
1468        return refs->be->transaction_commit(refs, transaction, err);
1469}
1470
1471int verify_refname_available(const char *refname,
1472                             const struct string_list *extra,
1473                             const struct string_list *skip,
1474                             struct strbuf *err)
1475{
1476        struct ref_store *refs = get_ref_store(NULL);
1477
1478        return refs->be->verify_refname_available(refs, refname, extra, skip, err);
1479}
1480
1481int for_each_reflog(each_ref_fn fn, void *cb_data)
1482{
1483        struct ref_store *refs = get_ref_store(NULL);
1484        struct ref_iterator *iter;
1485
1486        iter = refs->be->reflog_iterator_begin(refs);
1487
1488        return do_for_each_ref_iterator(iter, fn, cb_data);
1489}
1490
1491int for_each_reflog_ent_reverse(const char *refname, each_reflog_ent_fn fn,
1492                                void *cb_data)
1493{
1494        struct ref_store *refs = get_ref_store(NULL);
1495
1496        return refs->be->for_each_reflog_ent_reverse(refs, refname,
1497                                                     fn, cb_data);
1498}
1499
1500int for_each_reflog_ent(const char *refname, each_reflog_ent_fn fn,
1501                        void *cb_data)
1502{
1503        struct ref_store *refs = get_ref_store(NULL);
1504
1505        return refs->be->for_each_reflog_ent(refs, refname, fn, cb_data);
1506}
1507
1508int reflog_exists(const char *refname)
1509{
1510        struct ref_store *refs = get_ref_store(NULL);
1511
1512        return refs->be->reflog_exists(refs, refname);
1513}
1514
1515int safe_create_reflog(const char *refname, int force_create,
1516                       struct strbuf *err)
1517{
1518        struct ref_store *refs = get_ref_store(NULL);
1519
1520        return refs->be->create_reflog(refs, refname, force_create, err);
1521}
1522
1523int delete_reflog(const char *refname)
1524{
1525        struct ref_store *refs = get_ref_store(NULL);
1526
1527        return refs->be->delete_reflog(refs, refname);
1528}
1529
1530int reflog_expire(const char *refname, const unsigned char *sha1,
1531                  unsigned int flags,
1532                  reflog_expiry_prepare_fn prepare_fn,
1533                  reflog_expiry_should_prune_fn should_prune_fn,
1534                  reflog_expiry_cleanup_fn cleanup_fn,
1535                  void *policy_cb_data)
1536{
1537        struct ref_store *refs = get_ref_store(NULL);
1538
1539        return refs->be->reflog_expire(refs, refname, sha1, flags,
1540                                       prepare_fn, should_prune_fn,
1541                                       cleanup_fn, policy_cb_data);
1542}
1543
1544int initial_ref_transaction_commit(struct ref_transaction *transaction,
1545                                   struct strbuf *err)
1546{
1547        struct ref_store *refs = get_ref_store(NULL);
1548
1549        return refs->be->initial_transaction_commit(refs, transaction, err);
1550}
1551
1552int delete_refs(struct string_list *refnames, unsigned int flags)
1553{
1554        struct ref_store *refs = get_ref_store(NULL);
1555
1556        return refs->be->delete_refs(refs, refnames, flags);
1557}
1558
1559int rename_ref(const char *oldref, const char *newref, const char *logmsg)
1560{
1561        struct ref_store *refs = get_ref_store(NULL);
1562
1563        return refs->be->rename_ref(refs, oldref, newref, logmsg);
1564}