Andrew's git / gitweb.git / transport.c
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transport.con commit push: add a config option push.gpgSign for default signed pushes (68c757f)
   1#include "cache.h"
   2#include "transport.h"
   3#include "run-command.h"
   4#include "pkt-line.h"
   5#include "fetch-pack.h"
   6#include "remote.h"
   7#include "connect.h"
   8#include "send-pack.h"
   9#include "walker.h"
  10#include "bundle.h"
  11#include "dir.h"
  12#include "refs.h"
  13#include "branch.h"
  14#include "url.h"
  15#include "submodule.h"
  16#include "string-list.h"
  17#include "sha1-array.h"
  18
  19/* rsync support */
  20
  21/*
  22 * We copy packed-refs and refs/ into a temporary file, then read the
  23 * loose refs recursively (sorting whenever possible), and then inserting
  24 * those packed refs that are not yet in the list (not validating, but
  25 * assuming that the file is sorted).
  26 *
  27 * Appears refactoring this from refs.c is too cumbersome.
  28 */
  29
  30static int str_cmp(const void *a, const void *b)
  31{
  32        const char *s1 = a;
  33        const char *s2 = b;
  34
  35        return strcmp(s1, s2);
  36}
  37
  38/* path->buf + name_offset is expected to point to "refs/" */
  39
  40static int read_loose_refs(struct strbuf *path, int name_offset,
  41                struct ref **tail)
  42{
  43        DIR *dir = opendir(path->buf);
  44        struct dirent *de;
  45        struct {
  46                char **entries;
  47                int nr, alloc;
  48        } list;
  49        int i, pathlen;
  50
  51        if (!dir)
  52                return -1;
  53
  54        memset (&list, 0, sizeof(list));
  55
  56        while ((de = readdir(dir))) {
  57                if (is_dot_or_dotdot(de->d_name))
  58                        continue;
  59                ALLOC_GROW(list.entries, list.nr + 1, list.alloc);
  60                list.entries[list.nr++] = xstrdup(de->d_name);
  61        }
  62        closedir(dir);
  63
  64        /* sort the list */
  65
  66        qsort(list.entries, list.nr, sizeof(char *), str_cmp);
  67
  68        pathlen = path->len;
  69        strbuf_addch(path, '/');
  70
  71        for (i = 0; i < list.nr; i++, strbuf_setlen(path, pathlen + 1)) {
  72                strbuf_addstr(path, list.entries[i]);
  73                if (read_loose_refs(path, name_offset, tail)) {
  74                        int fd = open(path->buf, O_RDONLY);
  75                        char buffer[40];
  76                        struct ref *next;
  77
  78                        if (fd < 0)
  79                                continue;
  80                        next = alloc_ref(path->buf + name_offset);
  81                        if (read_in_full(fd, buffer, 40) != 40 ||
  82                                        get_sha1_hex(buffer, next->old_sha1)) {
  83                                close(fd);
  84                                free(next);
  85                                continue;
  86                        }
  87                        close(fd);
  88                        (*tail)->next = next;
  89                        *tail = next;
  90                }
  91        }
  92        strbuf_setlen(path, pathlen);
  93
  94        for (i = 0; i < list.nr; i++)
  95                free(list.entries[i]);
  96        free(list.entries);
  97
  98        return 0;
  99}
 100
 101/* insert the packed refs for which no loose refs were found */
 102
 103static void insert_packed_refs(const char *packed_refs, struct ref **list)
 104{
 105        FILE *f = fopen(packed_refs, "r");
 106        static char buffer[PATH_MAX];
 107
 108        if (!f)
 109                return;
 110
 111        for (;;) {
 112                int cmp = 0; /* assigned before used */
 113                int len;
 114
 115                if (!fgets(buffer, sizeof(buffer), f)) {
 116                        fclose(f);
 117                        return;
 118                }
 119
 120                if (!isxdigit(buffer[0]))
 121                        continue;
 122                len = strlen(buffer);
 123                if (len && buffer[len - 1] == '\n')
 124                        buffer[--len] = '\0';
 125                if (len < 41)
 126                        continue;
 127                while ((*list)->next &&
 128                                (cmp = strcmp(buffer + 41,
 129                                      (*list)->next->name)) > 0)
 130                        list = &(*list)->next;
 131                if (!(*list)->next || cmp < 0) {
 132                        struct ref *next = alloc_ref(buffer + 41);
 133                        buffer[40] = '\0';
 134                        if (get_sha1_hex(buffer, next->old_sha1)) {
 135                                warning ("invalid SHA-1: %s", buffer);
 136                                free(next);
 137                                continue;
 138                        }
 139                        next->next = (*list)->next;
 140                        (*list)->next = next;
 141                        list = &(*list)->next;
 142                }
 143        }
 144}
 145
 146static void set_upstreams(struct transport *transport, struct ref *refs,
 147        int pretend)
 148{
 149        struct ref *ref;
 150        for (ref = refs; ref; ref = ref->next) {
 151                const char *localname;
 152                const char *tmp;
 153                const char *remotename;
 154                unsigned char sha[20];
 155                int flag = 0;
 156                /*
 157                 * Check suitability for tracking. Must be successful /
 158                 * already up-to-date ref create/modify (not delete).
 159                 */
 160                if (ref->status != REF_STATUS_OK &&
 161                        ref->status != REF_STATUS_UPTODATE)
 162                        continue;
 163                if (!ref->peer_ref)
 164                        continue;
 165                if (is_null_sha1(ref->new_sha1))
 166                        continue;
 167
 168                /* Follow symbolic refs (mainly for HEAD). */
 169                localname = ref->peer_ref->name;
 170                remotename = ref->name;
 171                tmp = resolve_ref_unsafe(localname, RESOLVE_REF_READING,
 172                                         sha, &flag);
 173                if (tmp && flag & REF_ISSYMREF &&
 174                        starts_with(tmp, "refs/heads/"))
 175                        localname = tmp;
 176
 177                /* Both source and destination must be local branches. */
 178                if (!localname || !starts_with(localname, "refs/heads/"))
 179                        continue;
 180                if (!remotename || !starts_with(remotename, "refs/heads/"))
 181                        continue;
 182
 183                if (!pretend)
 184                        install_branch_config(BRANCH_CONFIG_VERBOSE,
 185                                localname + 11, transport->remote->name,
 186                                remotename);
 187                else
 188                        printf("Would set upstream of '%s' to '%s' of '%s'\n",
 189                                localname + 11, remotename + 11,
 190                                transport->remote->name);
 191        }
 192}
 193
 194static const char *rsync_url(const char *url)
 195{
 196        if (!starts_with(url, "rsync://"))
 197                skip_prefix(url, "rsync:", &url);
 198        return url;
 199}
 200
 201static struct ref *get_refs_via_rsync(struct transport *transport, int for_push)
 202{
 203        struct strbuf buf = STRBUF_INIT, temp_dir = STRBUF_INIT;
 204        struct ref dummy = {NULL}, *tail = &dummy;
 205        struct child_process rsync = CHILD_PROCESS_INIT;
 206        const char *args[5];
 207        int temp_dir_len;
 208
 209        if (for_push)
 210                return NULL;
 211
 212        /* copy the refs to the temporary directory */
 213
 214        strbuf_addstr(&temp_dir, git_path("rsync-refs-XXXXXX"));
 215        if (!mkdtemp(temp_dir.buf))
 216                die_errno ("Could not make temporary directory");
 217        temp_dir_len = temp_dir.len;
 218
 219        strbuf_addstr(&buf, rsync_url(transport->url));
 220        strbuf_addstr(&buf, "/refs");
 221
 222        rsync.argv = args;
 223        rsync.stdout_to_stderr = 1;
 224        args[0] = "rsync";
 225        args[1] = (transport->verbose > 1) ? "-rv" : "-r";
 226        args[2] = buf.buf;
 227        args[3] = temp_dir.buf;
 228        args[4] = NULL;
 229
 230        if (run_command(&rsync))
 231                die ("Could not run rsync to get refs");
 232
 233        strbuf_reset(&buf);
 234        strbuf_addstr(&buf, rsync_url(transport->url));
 235        strbuf_addstr(&buf, "/packed-refs");
 236
 237        args[2] = buf.buf;
 238
 239        if (run_command(&rsync))
 240                die ("Could not run rsync to get refs");
 241
 242        /* read the copied refs */
 243
 244        strbuf_addstr(&temp_dir, "/refs");
 245        read_loose_refs(&temp_dir, temp_dir_len + 1, &tail);
 246        strbuf_setlen(&temp_dir, temp_dir_len);
 247
 248        tail = &dummy;
 249        strbuf_addstr(&temp_dir, "/packed-refs");
 250        insert_packed_refs(temp_dir.buf, &tail);
 251        strbuf_setlen(&temp_dir, temp_dir_len);
 252
 253        if (remove_dir_recursively(&temp_dir, 0))
 254                warning ("Error removing temporary directory %s.",
 255                                temp_dir.buf);
 256
 257        strbuf_release(&buf);
 258        strbuf_release(&temp_dir);
 259
 260        return dummy.next;
 261}
 262
 263static int fetch_objs_via_rsync(struct transport *transport,
 264                                int nr_objs, struct ref **to_fetch)
 265{
 266        struct child_process rsync = CHILD_PROCESS_INIT;
 267
 268        rsync.stdout_to_stderr = 1;
 269        argv_array_push(&rsync.args, "rsync");
 270        argv_array_push(&rsync.args, (transport->verbose > 1) ? "-rv" : "-r");
 271        argv_array_push(&rsync.args, "--ignore-existing");
 272        argv_array_push(&rsync.args, "--exclude");
 273        argv_array_push(&rsync.args, "info");
 274        argv_array_pushf(&rsync.args, "%s/objects/", rsync_url(transport->url));
 275        argv_array_push(&rsync.args, get_object_directory());
 276
 277        /* NEEDSWORK: handle one level of alternates */
 278        return run_command(&rsync);
 279}
 280
 281static int write_one_ref(const char *name, const unsigned char *sha1,
 282                int flags, void *data)
 283{
 284        struct strbuf *buf = data;
 285        int len = buf->len;
 286        FILE *f;
 287
 288        /* when called via for_each_ref(), flags is non-zero */
 289        if (flags && !starts_with(name, "refs/heads/") &&
 290                        !starts_with(name, "refs/tags/"))
 291                return 0;
 292
 293        strbuf_addstr(buf, name);
 294        if (safe_create_leading_directories(buf->buf) ||
 295                        !(f = fopen(buf->buf, "w")) ||
 296                        fprintf(f, "%s\n", sha1_to_hex(sha1)) < 0 ||
 297                        fclose(f))
 298                return error("problems writing temporary file %s", buf->buf);
 299        strbuf_setlen(buf, len);
 300        return 0;
 301}
 302
 303static int write_refs_to_temp_dir(struct strbuf *temp_dir,
 304                int refspec_nr, const char **refspec)
 305{
 306        int i;
 307
 308        for (i = 0; i < refspec_nr; i++) {
 309                unsigned char sha1[20];
 310                char *ref;
 311
 312                if (dwim_ref(refspec[i], strlen(refspec[i]), sha1, &ref) != 1)
 313                        return error("Could not get ref %s", refspec[i]);
 314
 315                if (write_one_ref(ref, sha1, 0, temp_dir)) {
 316                        free(ref);
 317                        return -1;
 318                }
 319                free(ref);
 320        }
 321        return 0;
 322}
 323
 324static int rsync_transport_push(struct transport *transport,
 325                int refspec_nr, const char **refspec, int flags)
 326{
 327        struct strbuf buf = STRBUF_INIT, temp_dir = STRBUF_INIT;
 328        int result = 0, i;
 329        struct child_process rsync = CHILD_PROCESS_INIT;
 330        const char *args[10];
 331
 332        if (flags & TRANSPORT_PUSH_MIRROR)
 333                return error("rsync transport does not support mirror mode");
 334
 335        /* first push the objects */
 336
 337        strbuf_addstr(&buf, rsync_url(transport->url));
 338        strbuf_addch(&buf, '/');
 339
 340        rsync.argv = args;
 341        rsync.stdout_to_stderr = 1;
 342        i = 0;
 343        args[i++] = "rsync";
 344        args[i++] = "-a";
 345        if (flags & TRANSPORT_PUSH_DRY_RUN)
 346                args[i++] = "--dry-run";
 347        if (transport->verbose > 1)
 348                args[i++] = "-v";
 349        args[i++] = "--ignore-existing";
 350        args[i++] = "--exclude";
 351        args[i++] = "info";
 352        args[i++] = get_object_directory();
 353        args[i++] = buf.buf;
 354        args[i++] = NULL;
 355
 356        if (run_command(&rsync))
 357                return error("Could not push objects to %s",
 358                                rsync_url(transport->url));
 359
 360        /* copy the refs to the temporary directory; they could be packed. */
 361
 362        strbuf_addstr(&temp_dir, git_path("rsync-refs-XXXXXX"));
 363        if (!mkdtemp(temp_dir.buf))
 364                die_errno ("Could not make temporary directory");
 365        strbuf_addch(&temp_dir, '/');
 366
 367        if (flags & TRANSPORT_PUSH_ALL) {
 368                if (for_each_ref(write_one_ref, &temp_dir))
 369                        return -1;
 370        } else if (write_refs_to_temp_dir(&temp_dir, refspec_nr, refspec))
 371                return -1;
 372
 373        i = 2;
 374        if (flags & TRANSPORT_PUSH_DRY_RUN)
 375                args[i++] = "--dry-run";
 376        if (!(flags & TRANSPORT_PUSH_FORCE))
 377                args[i++] = "--ignore-existing";
 378        args[i++] = temp_dir.buf;
 379        args[i++] = rsync_url(transport->url);
 380        args[i++] = NULL;
 381        if (run_command(&rsync))
 382                result = error("Could not push to %s",
 383                                rsync_url(transport->url));
 384
 385        if (remove_dir_recursively(&temp_dir, 0))
 386                warning ("Could not remove temporary directory %s.",
 387                                temp_dir.buf);
 388
 389        strbuf_release(&buf);
 390        strbuf_release(&temp_dir);
 391
 392        return result;
 393}
 394
 395struct bundle_transport_data {
 396        int fd;
 397        struct bundle_header header;
 398};
 399
 400static struct ref *get_refs_from_bundle(struct transport *transport, int for_push)
 401{
 402        struct bundle_transport_data *data = transport->data;
 403        struct ref *result = NULL;
 404        int i;
 405
 406        if (for_push)
 407                return NULL;
 408
 409        if (data->fd > 0)
 410                close(data->fd);
 411        data->fd = read_bundle_header(transport->url, &data->header);
 412        if (data->fd < 0)
 413                die ("Could not read bundle '%s'.", transport->url);
 414        for (i = 0; i < data->header.references.nr; i++) {
 415                struct ref_list_entry *e = data->header.references.list + i;
 416                struct ref *ref = alloc_ref(e->name);
 417                hashcpy(ref->old_sha1, e->sha1);
 418                ref->next = result;
 419                result = ref;
 420        }
 421        return result;
 422}
 423
 424static int fetch_refs_from_bundle(struct transport *transport,
 425                               int nr_heads, struct ref **to_fetch)
 426{
 427        struct bundle_transport_data *data = transport->data;
 428        return unbundle(&data->header, data->fd,
 429                        transport->progress ? BUNDLE_VERBOSE : 0);
 430}
 431
 432static int close_bundle(struct transport *transport)
 433{
 434        struct bundle_transport_data *data = transport->data;
 435        if (data->fd > 0)
 436                close(data->fd);
 437        free(data);
 438        return 0;
 439}
 440
 441struct git_transport_data {
 442        struct git_transport_options options;
 443        struct child_process *conn;
 444        int fd[2];
 445        unsigned got_remote_heads : 1;
 446        struct sha1_array extra_have;
 447        struct sha1_array shallow;
 448};
 449
 450static int set_git_option(struct git_transport_options *opts,
 451                          const char *name, const char *value)
 452{
 453        if (!strcmp(name, TRANS_OPT_UPLOADPACK)) {
 454                opts->uploadpack = value;
 455                return 0;
 456        } else if (!strcmp(name, TRANS_OPT_RECEIVEPACK)) {
 457                opts->receivepack = value;
 458                return 0;
 459        } else if (!strcmp(name, TRANS_OPT_THIN)) {
 460                opts->thin = !!value;
 461                return 0;
 462        } else if (!strcmp(name, TRANS_OPT_FOLLOWTAGS)) {
 463                opts->followtags = !!value;
 464                return 0;
 465        } else if (!strcmp(name, TRANS_OPT_KEEP)) {
 466                opts->keep = !!value;
 467                return 0;
 468        } else if (!strcmp(name, TRANS_OPT_UPDATE_SHALLOW)) {
 469                opts->update_shallow = !!value;
 470                return 0;
 471        } else if (!strcmp(name, TRANS_OPT_DEPTH)) {
 472                if (!value)
 473                        opts->depth = 0;
 474                else {
 475                        char *end;
 476                        opts->depth = strtol(value, &end, 0);
 477                        if (*end)
 478                                die("transport: invalid depth option '%s'", value);
 479                }
 480                return 0;
 481        }
 482        return 1;
 483}
 484
 485static int connect_setup(struct transport *transport, int for_push, int verbose)
 486{
 487        struct git_transport_data *data = transport->data;
 488
 489        if (data->conn)
 490                return 0;
 491
 492        data->conn = git_connect(data->fd, transport->url,
 493                                 for_push ? data->options.receivepack :
 494                                 data->options.uploadpack,
 495                                 verbose ? CONNECT_VERBOSE : 0);
 496
 497        return 0;
 498}
 499
 500static struct ref *get_refs_via_connect(struct transport *transport, int for_push)
 501{
 502        struct git_transport_data *data = transport->data;
 503        struct ref *refs;
 504
 505        connect_setup(transport, for_push, 0);
 506        get_remote_heads(data->fd[0], NULL, 0, &refs,
 507                         for_push ? REF_NORMAL : 0,
 508                         &data->extra_have,
 509                         &data->shallow);
 510        data->got_remote_heads = 1;
 511
 512        return refs;
 513}
 514
 515static int fetch_refs_via_pack(struct transport *transport,
 516                               int nr_heads, struct ref **to_fetch)
 517{
 518        struct git_transport_data *data = transport->data;
 519        struct ref *refs;
 520        char *dest = xstrdup(transport->url);
 521        struct fetch_pack_args args;
 522        struct ref *refs_tmp = NULL;
 523
 524        memset(&args, 0, sizeof(args));
 525        args.uploadpack = data->options.uploadpack;
 526        args.keep_pack = data->options.keep;
 527        args.lock_pack = 1;
 528        args.use_thin_pack = data->options.thin;
 529        args.include_tag = data->options.followtags;
 530        args.verbose = (transport->verbose > 1);
 531        args.quiet = (transport->verbose < 0);
 532        args.no_progress = !transport->progress;
 533        args.depth = data->options.depth;
 534        args.check_self_contained_and_connected =
 535                data->options.check_self_contained_and_connected;
 536        args.cloning = transport->cloning;
 537        args.update_shallow = data->options.update_shallow;
 538
 539        if (!data->got_remote_heads) {
 540                connect_setup(transport, 0, 0);
 541                get_remote_heads(data->fd[0], NULL, 0, &refs_tmp, 0,
 542                                 NULL, &data->shallow);
 543                data->got_remote_heads = 1;
 544        }
 545
 546        refs = fetch_pack(&args, data->fd, data->conn,
 547                          refs_tmp ? refs_tmp : transport->remote_refs,
 548                          dest, to_fetch, nr_heads, &data->shallow,
 549                          &transport->pack_lockfile);
 550        close(data->fd[0]);
 551        close(data->fd[1]);
 552        if (finish_connect(data->conn)) {
 553                free_refs(refs);
 554                refs = NULL;
 555        }
 556        data->conn = NULL;
 557        data->got_remote_heads = 0;
 558        data->options.self_contained_and_connected =
 559                args.self_contained_and_connected;
 560
 561        free_refs(refs_tmp);
 562        free_refs(refs);
 563        free(dest);
 564        return (refs ? 0 : -1);
 565}
 566
 567static int push_had_errors(struct ref *ref)
 568{
 569        for (; ref; ref = ref->next) {
 570                switch (ref->status) {
 571                case REF_STATUS_NONE:
 572                case REF_STATUS_UPTODATE:
 573                case REF_STATUS_OK:
 574                        break;
 575                default:
 576                        return 1;
 577                }
 578        }
 579        return 0;
 580}
 581
 582int transport_refs_pushed(struct ref *ref)
 583{
 584        for (; ref; ref = ref->next) {
 585                switch(ref->status) {
 586                case REF_STATUS_NONE:
 587                case REF_STATUS_UPTODATE:
 588                        break;
 589                default:
 590                        return 1;
 591                }
 592        }
 593        return 0;
 594}
 595
 596void transport_update_tracking_ref(struct remote *remote, struct ref *ref, int verbose)
 597{
 598        struct refspec rs;
 599
 600        if (ref->status != REF_STATUS_OK && ref->status != REF_STATUS_UPTODATE)
 601                return;
 602
 603        rs.src = ref->name;
 604        rs.dst = NULL;
 605
 606        if (!remote_find_tracking(remote, &rs)) {
 607                if (verbose)
 608                        fprintf(stderr, "updating local tracking ref '%s'\n", rs.dst);
 609                if (ref->deletion) {
 610                        delete_ref(rs.dst, NULL, 0);
 611                } else
 612                        update_ref("update by push", rs.dst,
 613                                        ref->new_sha1, NULL, 0, 0);
 614                free(rs.dst);
 615        }
 616}
 617
 618static void print_ref_status(char flag, const char *summary, struct ref *to, struct ref *from, const char *msg, int porcelain)
 619{
 620        if (porcelain) {
 621                if (from)
 622                        fprintf(stdout, "%c\t%s:%s\t", flag, from->name, to->name);
 623                else
 624                        fprintf(stdout, "%c\t:%s\t", flag, to->name);
 625                if (msg)
 626                        fprintf(stdout, "%s (%s)\n", summary, msg);
 627                else
 628                        fprintf(stdout, "%s\n", summary);
 629        } else {
 630                fprintf(stderr, " %c %-*s ", flag, TRANSPORT_SUMMARY_WIDTH, summary);
 631                if (from)
 632                        fprintf(stderr, "%s -> %s", prettify_refname(from->name), prettify_refname(to->name));
 633                else
 634                        fputs(prettify_refname(to->name), stderr);
 635                if (msg) {
 636                        fputs(" (", stderr);
 637                        fputs(msg, stderr);
 638                        fputc(')', stderr);
 639                }
 640                fputc('\n', stderr);
 641        }
 642}
 643
 644static const char *status_abbrev(unsigned char sha1[20])
 645{
 646        return find_unique_abbrev(sha1, DEFAULT_ABBREV);
 647}
 648
 649static void print_ok_ref_status(struct ref *ref, int porcelain)
 650{
 651        if (ref->deletion)
 652                print_ref_status('-', "[deleted]", ref, NULL, NULL, porcelain);
 653        else if (is_null_sha1(ref->old_sha1))
 654                print_ref_status('*',
 655                        (starts_with(ref->name, "refs/tags/") ? "[new tag]" :
 656                        "[new branch]"),
 657                        ref, ref->peer_ref, NULL, porcelain);
 658        else {
 659                char quickref[84];
 660                char type;
 661                const char *msg;
 662
 663                strcpy(quickref, status_abbrev(ref->old_sha1));
 664                if (ref->forced_update) {
 665                        strcat(quickref, "...");
 666                        type = '+';
 667                        msg = "forced update";
 668                } else {
 669                        strcat(quickref, "..");
 670                        type = ' ';
 671                        msg = NULL;
 672                }
 673                strcat(quickref, status_abbrev(ref->new_sha1));
 674
 675                print_ref_status(type, quickref, ref, ref->peer_ref, msg, porcelain);
 676        }
 677}
 678
 679static int print_one_push_status(struct ref *ref, const char *dest, int count, int porcelain)
 680{
 681        if (!count)
 682                fprintf(porcelain ? stdout : stderr, "To %s\n", dest);
 683
 684        switch(ref->status) {
 685        case REF_STATUS_NONE:
 686                print_ref_status('X', "[no match]", ref, NULL, NULL, porcelain);
 687                break;
 688        case REF_STATUS_REJECT_NODELETE:
 689                print_ref_status('!', "[rejected]", ref, NULL,
 690                                                 "remote does not support deleting refs", porcelain);
 691                break;
 692        case REF_STATUS_UPTODATE:
 693                print_ref_status('=', "[up to date]", ref,
 694                                                 ref->peer_ref, NULL, porcelain);
 695                break;
 696        case REF_STATUS_REJECT_NONFASTFORWARD:
 697                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 698                                                 "non-fast-forward", porcelain);
 699                break;
 700        case REF_STATUS_REJECT_ALREADY_EXISTS:
 701                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 702                                                 "already exists", porcelain);
 703                break;
 704        case REF_STATUS_REJECT_FETCH_FIRST:
 705                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 706                                                 "fetch first", porcelain);
 707                break;
 708        case REF_STATUS_REJECT_NEEDS_FORCE:
 709                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 710                                                 "needs force", porcelain);
 711                break;
 712        case REF_STATUS_REJECT_STALE:
 713                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 714                                                 "stale info", porcelain);
 715                break;
 716        case REF_STATUS_REJECT_SHALLOW:
 717                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 718                                                 "new shallow roots not allowed", porcelain);
 719                break;
 720        case REF_STATUS_REMOTE_REJECT:
 721                print_ref_status('!', "[remote rejected]", ref,
 722                                                 ref->deletion ? NULL : ref->peer_ref,
 723                                                 ref->remote_status, porcelain);
 724                break;
 725        case REF_STATUS_EXPECTING_REPORT:
 726                print_ref_status('!', "[remote failure]", ref,
 727                                                 ref->deletion ? NULL : ref->peer_ref,
 728                                                 "remote failed to report status", porcelain);
 729                break;
 730        case REF_STATUS_ATOMIC_PUSH_FAILED:
 731                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 732                                                 "atomic push failed", porcelain);
 733                break;
 734        case REF_STATUS_OK:
 735                print_ok_ref_status(ref, porcelain);
 736                break;
 737        }
 738
 739        return 1;
 740}
 741
 742void transport_print_push_status(const char *dest, struct ref *refs,
 743                                  int verbose, int porcelain, unsigned int *reject_reasons)
 744{
 745        struct ref *ref;
 746        int n = 0;
 747        unsigned char head_sha1[20];
 748        char *head;
 749
 750        head = resolve_refdup("HEAD", RESOLVE_REF_READING, head_sha1, NULL);
 751
 752        if (verbose) {
 753                for (ref = refs; ref; ref = ref->next)
 754                        if (ref->status == REF_STATUS_UPTODATE)
 755                                n += print_one_push_status(ref, dest, n, porcelain);
 756        }
 757
 758        for (ref = refs; ref; ref = ref->next)
 759                if (ref->status == REF_STATUS_OK)
 760                        n += print_one_push_status(ref, dest, n, porcelain);
 761
 762        *reject_reasons = 0;
 763        for (ref = refs; ref; ref = ref->next) {
 764                if (ref->status != REF_STATUS_NONE &&
 765                    ref->status != REF_STATUS_UPTODATE &&
 766                    ref->status != REF_STATUS_OK)
 767                        n += print_one_push_status(ref, dest, n, porcelain);
 768                if (ref->status == REF_STATUS_REJECT_NONFASTFORWARD) {
 769                        if (head != NULL && !strcmp(head, ref->name))
 770                                *reject_reasons |= REJECT_NON_FF_HEAD;
 771                        else
 772                                *reject_reasons |= REJECT_NON_FF_OTHER;
 773                } else if (ref->status == REF_STATUS_REJECT_ALREADY_EXISTS) {
 774                        *reject_reasons |= REJECT_ALREADY_EXISTS;
 775                } else if (ref->status == REF_STATUS_REJECT_FETCH_FIRST) {
 776                        *reject_reasons |= REJECT_FETCH_FIRST;
 777                } else if (ref->status == REF_STATUS_REJECT_NEEDS_FORCE) {
 778                        *reject_reasons |= REJECT_NEEDS_FORCE;
 779                }
 780        }
 781        free(head);
 782}
 783
 784void transport_verify_remote_names(int nr_heads, const char **heads)
 785{
 786        int i;
 787
 788        for (i = 0; i < nr_heads; i++) {
 789                const char *local = heads[i];
 790                const char *remote = strrchr(heads[i], ':');
 791
 792                if (*local == '+')
 793                        local++;
 794
 795                /* A matching refspec is okay.  */
 796                if (remote == local && remote[1] == '\0')
 797                        continue;
 798
 799                remote = remote ? (remote + 1) : local;
 800                if (check_refname_format(remote,
 801                                REFNAME_ALLOW_ONELEVEL|REFNAME_REFSPEC_PATTERN))
 802                        die("remote part of refspec is not a valid name in %s",
 803                                heads[i]);
 804        }
 805}
 806
 807static int git_transport_push(struct transport *transport, struct ref *remote_refs, int flags)
 808{
 809        struct git_transport_data *data = transport->data;
 810        struct send_pack_args args;
 811        int ret;
 812
 813        if (!data->got_remote_heads) {
 814                struct ref *tmp_refs;
 815                connect_setup(transport, 1, 0);
 816
 817                get_remote_heads(data->fd[0], NULL, 0, &tmp_refs, REF_NORMAL,
 818                                 NULL, &data->shallow);
 819                data->got_remote_heads = 1;
 820        }
 821
 822        memset(&args, 0, sizeof(args));
 823        args.send_mirror = !!(flags & TRANSPORT_PUSH_MIRROR);
 824        args.force_update = !!(flags & TRANSPORT_PUSH_FORCE);
 825        args.use_thin_pack = data->options.thin;
 826        args.verbose = (transport->verbose > 0);
 827        args.quiet = (transport->verbose < 0);
 828        args.progress = transport->progress;
 829        args.dry_run = !!(flags & TRANSPORT_PUSH_DRY_RUN);
 830        args.porcelain = !!(flags & TRANSPORT_PUSH_PORCELAIN);
 831        args.atomic = !!(flags & TRANSPORT_PUSH_ATOMIC);
 832        args.url = transport->url;
 833
 834        if (flags & TRANSPORT_PUSH_CERT_ALWAYS)
 835                args.push_cert = SEND_PACK_PUSH_CERT_ALWAYS;
 836        else if (flags & TRANSPORT_PUSH_CERT_IF_ASKED)
 837                args.push_cert = SEND_PACK_PUSH_CERT_IF_ASKED;
 838        else
 839                args.push_cert = SEND_PACK_PUSH_CERT_NEVER;
 840
 841        ret = send_pack(&args, data->fd, data->conn, remote_refs,
 842                        &data->extra_have);
 843
 844        close(data->fd[1]);
 845        close(data->fd[0]);
 846        ret |= finish_connect(data->conn);
 847        data->conn = NULL;
 848        data->got_remote_heads = 0;
 849
 850        return ret;
 851}
 852
 853static int connect_git(struct transport *transport, const char *name,
 854                       const char *executable, int fd[2])
 855{
 856        struct git_transport_data *data = transport->data;
 857        data->conn = git_connect(data->fd, transport->url,
 858                                 executable, 0);
 859        fd[0] = data->fd[0];
 860        fd[1] = data->fd[1];
 861        return 0;
 862}
 863
 864static int disconnect_git(struct transport *transport)
 865{
 866        struct git_transport_data *data = transport->data;
 867        if (data->conn) {
 868                if (data->got_remote_heads)
 869                        packet_flush(data->fd[1]);
 870                close(data->fd[0]);
 871                close(data->fd[1]);
 872                finish_connect(data->conn);
 873        }
 874
 875        free(data);
 876        return 0;
 877}
 878
 879void transport_take_over(struct transport *transport,
 880                         struct child_process *child)
 881{
 882        struct git_transport_data *data;
 883
 884        if (!transport->smart_options)
 885                die("Bug detected: Taking over transport requires non-NULL "
 886                    "smart_options field.");
 887
 888        data = xcalloc(1, sizeof(*data));
 889        data->options = *transport->smart_options;
 890        data->conn = child;
 891        data->fd[0] = data->conn->out;
 892        data->fd[1] = data->conn->in;
 893        data->got_remote_heads = 0;
 894        transport->data = data;
 895
 896        transport->set_option = NULL;
 897        transport->get_refs_list = get_refs_via_connect;
 898        transport->fetch = fetch_refs_via_pack;
 899        transport->push = NULL;
 900        transport->push_refs = git_transport_push;
 901        transport->disconnect = disconnect_git;
 902        transport->smart_options = &(data->options);
 903
 904        transport->cannot_reuse = 1;
 905}
 906
 907static int is_file(const char *url)
 908{
 909        struct stat buf;
 910        if (stat(url, &buf))
 911                return 0;
 912        return S_ISREG(buf.st_mode);
 913}
 914
 915static int external_specification_len(const char *url)
 916{
 917        return strchr(url, ':') - url;
 918}
 919
 920struct transport *transport_get(struct remote *remote, const char *url)
 921{
 922        const char *helper;
 923        struct transport *ret = xcalloc(1, sizeof(*ret));
 924
 925        ret->progress = isatty(2);
 926
 927        if (!remote)
 928                die("No remote provided to transport_get()");
 929
 930        ret->got_remote_refs = 0;
 931        ret->remote = remote;
 932        helper = remote->foreign_vcs;
 933
 934        if (!url && remote->url)
 935                url = remote->url[0];
 936        ret->url = url;
 937
 938        /* maybe it is a foreign URL? */
 939        if (url) {
 940                const char *p = url;
 941
 942                while (is_urlschemechar(p == url, *p))
 943                        p++;
 944                if (starts_with(p, "::"))
 945                        helper = xstrndup(url, p - url);
 946        }
 947
 948        if (helper) {
 949                transport_helper_init(ret, helper);
 950        } else if (starts_with(url, "rsync:")) {
 951                ret->get_refs_list = get_refs_via_rsync;
 952                ret->fetch = fetch_objs_via_rsync;
 953                ret->push = rsync_transport_push;
 954                ret->smart_options = NULL;
 955        } else if (url_is_local_not_ssh(url) && is_file(url) && is_bundle(url, 1)) {
 956                struct bundle_transport_data *data = xcalloc(1, sizeof(*data));
 957                ret->data = data;
 958                ret->get_refs_list = get_refs_from_bundle;
 959                ret->fetch = fetch_refs_from_bundle;
 960                ret->disconnect = close_bundle;
 961                ret->smart_options = NULL;
 962        } else if (!is_url(url)
 963                || starts_with(url, "file://")
 964                || starts_with(url, "git://")
 965                || starts_with(url, "ssh://")
 966                || starts_with(url, "git+ssh://")
 967                || starts_with(url, "ssh+git://")) {
 968                /* These are builtin smart transports. */
 969                struct git_transport_data *data = xcalloc(1, sizeof(*data));
 970                ret->data = data;
 971                ret->set_option = NULL;
 972                ret->get_refs_list = get_refs_via_connect;
 973                ret->fetch = fetch_refs_via_pack;
 974                ret->push_refs = git_transport_push;
 975                ret->connect = connect_git;
 976                ret->disconnect = disconnect_git;
 977                ret->smart_options = &(data->options);
 978
 979                data->conn = NULL;
 980                data->got_remote_heads = 0;
 981        } else {
 982                /* Unknown protocol in URL. Pass to external handler. */
 983                int len = external_specification_len(url);
 984                char *handler = xmemdupz(url, len);
 985                transport_helper_init(ret, handler);
 986        }
 987
 988        if (ret->smart_options) {
 989                ret->smart_options->thin = 1;
 990                ret->smart_options->uploadpack = "git-upload-pack";
 991                if (remote->uploadpack)
 992                        ret->smart_options->uploadpack = remote->uploadpack;
 993                ret->smart_options->receivepack = "git-receive-pack";
 994                if (remote->receivepack)
 995                        ret->smart_options->receivepack = remote->receivepack;
 996        }
 997
 998        return ret;
 999}
1000
1001int transport_set_option(struct transport *transport,
1002                         const char *name, const char *value)
1003{
1004        int git_reports = 1, protocol_reports = 1;
1005
1006        if (transport->smart_options)
1007                git_reports = set_git_option(transport->smart_options,
1008                                             name, value);
1009
1010        if (transport->set_option)
1011                protocol_reports = transport->set_option(transport, name,
1012                                                        value);
1013
1014        /* If either report is 0, report 0 (success). */
1015        if (!git_reports || !protocol_reports)
1016                return 0;
1017        /* If either reports -1 (invalid value), report -1. */
1018        if ((git_reports == -1) || (protocol_reports == -1))
1019                return -1;
1020        /* Otherwise if both report unknown, report unknown. */
1021        return 1;
1022}
1023
1024void transport_set_verbosity(struct transport *transport, int verbosity,
1025        int force_progress)
1026{
1027        if (verbosity >= 1)
1028                transport->verbose = verbosity <= 3 ? verbosity : 3;
1029        if (verbosity < 0)
1030                transport->verbose = -1;
1031
1032        /**
1033         * Rules used to determine whether to report progress (processing aborts
1034         * when a rule is satisfied):
1035         *
1036         *   . Report progress, if force_progress is 1 (ie. --progress).
1037         *   . Don't report progress, if force_progress is 0 (ie. --no-progress).
1038         *   . Don't report progress, if verbosity < 0 (ie. -q/--quiet ).
1039         *   . Report progress if isatty(2) is 1.
1040         **/
1041        if (force_progress >= 0)
1042                transport->progress = !!force_progress;
1043        else
1044                transport->progress = verbosity >= 0 && isatty(2);
1045}
1046
1047static void die_with_unpushed_submodules(struct string_list *needs_pushing)
1048{
1049        int i;
1050
1051        fprintf(stderr, "The following submodule paths contain changes that can\n"
1052                        "not be found on any remote:\n");
1053        for (i = 0; i < needs_pushing->nr; i++)
1054                printf("  %s\n", needs_pushing->items[i].string);
1055        fprintf(stderr, "\nPlease try\n\n"
1056                        "       git push --recurse-submodules=on-demand\n\n"
1057                        "or cd to the path and use\n\n"
1058                        "       git push\n\n"
1059                        "to push them to a remote.\n\n");
1060
1061        string_list_clear(needs_pushing, 0);
1062
1063        die("Aborting.");
1064}
1065
1066static int run_pre_push_hook(struct transport *transport,
1067                             struct ref *remote_refs)
1068{
1069        int ret = 0, x;
1070        struct ref *r;
1071        struct child_process proc = CHILD_PROCESS_INIT;
1072        struct strbuf buf;
1073        const char *argv[4];
1074
1075        if (!(argv[0] = find_hook("pre-push")))
1076                return 0;
1077
1078        argv[1] = transport->remote->name;
1079        argv[2] = transport->url;
1080        argv[3] = NULL;
1081
1082        proc.argv = argv;
1083        proc.in = -1;
1084
1085        if (start_command(&proc)) {
1086                finish_command(&proc);
1087                return -1;
1088        }
1089
1090        strbuf_init(&buf, 256);
1091
1092        for (r = remote_refs; r; r = r->next) {
1093                if (!r->peer_ref) continue;
1094                if (r->status == REF_STATUS_REJECT_NONFASTFORWARD) continue;
1095                if (r->status == REF_STATUS_REJECT_STALE) continue;
1096                if (r->status == REF_STATUS_UPTODATE) continue;
1097
1098                strbuf_reset(&buf);
1099                strbuf_addf( &buf, "%s %s %s %s\n",
1100                         r->peer_ref->name, sha1_to_hex(r->new_sha1),
1101                         r->name, sha1_to_hex(r->old_sha1));
1102
1103                if (write_in_full(proc.in, buf.buf, buf.len) != buf.len) {
1104                        ret = -1;
1105                        break;
1106                }
1107        }
1108
1109        strbuf_release(&buf);
1110
1111        x = close(proc.in);
1112        if (!ret)
1113                ret = x;
1114
1115        x = finish_command(&proc);
1116        if (!ret)
1117                ret = x;
1118
1119        return ret;
1120}
1121
1122int transport_push(struct transport *transport,
1123                   int refspec_nr, const char **refspec, int flags,
1124                   unsigned int *reject_reasons)
1125{
1126        *reject_reasons = 0;
1127        transport_verify_remote_names(refspec_nr, refspec);
1128
1129        if (transport->push) {
1130                /* Maybe FIXME. But no important transport uses this case. */
1131                if (flags & TRANSPORT_PUSH_SET_UPSTREAM)
1132                        die("This transport does not support using --set-upstream");
1133
1134                return transport->push(transport, refspec_nr, refspec, flags);
1135        } else if (transport->push_refs) {
1136                struct ref *remote_refs;
1137                struct ref *local_refs = get_local_heads();
1138                int match_flags = MATCH_REFS_NONE;
1139                int verbose = (transport->verbose > 0);
1140                int quiet = (transport->verbose < 0);
1141                int porcelain = flags & TRANSPORT_PUSH_PORCELAIN;
1142                int pretend = flags & TRANSPORT_PUSH_DRY_RUN;
1143                int push_ret, ret, err;
1144
1145                if (check_push_refs(local_refs, refspec_nr, refspec) < 0)
1146                        return -1;
1147
1148                remote_refs = transport->get_refs_list(transport, 1);
1149
1150                if (flags & TRANSPORT_PUSH_ALL)
1151                        match_flags |= MATCH_REFS_ALL;
1152                if (flags & TRANSPORT_PUSH_MIRROR)
1153                        match_flags |= MATCH_REFS_MIRROR;
1154                if (flags & TRANSPORT_PUSH_PRUNE)
1155                        match_flags |= MATCH_REFS_PRUNE;
1156                if (flags & TRANSPORT_PUSH_FOLLOW_TAGS)
1157                        match_flags |= MATCH_REFS_FOLLOW_TAGS;
1158
1159                if (match_push_refs(local_refs, &remote_refs,
1160                                    refspec_nr, refspec, match_flags)) {
1161                        return -1;
1162                }
1163
1164                if (transport->smart_options &&
1165                    transport->smart_options->cas &&
1166                    !is_empty_cas(transport->smart_options->cas))
1167                        apply_push_cas(transport->smart_options->cas,
1168                                       transport->remote, remote_refs);
1169
1170                set_ref_status_for_push(remote_refs,
1171                        flags & TRANSPORT_PUSH_MIRROR,
1172                        flags & TRANSPORT_PUSH_FORCE);
1173
1174                if (!(flags & TRANSPORT_PUSH_NO_HOOK))
1175                        if (run_pre_push_hook(transport, remote_refs))
1176                                return -1;
1177
1178                if ((flags & TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND) && !is_bare_repository()) {
1179                        struct ref *ref = remote_refs;
1180                        for (; ref; ref = ref->next)
1181                                if (!is_null_sha1(ref->new_sha1) &&
1182                                    !push_unpushed_submodules(ref->new_sha1,
1183                                            transport->remote->name))
1184                                    die ("Failed to push all needed submodules!");
1185                }
1186
1187                if ((flags & (TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND |
1188                              TRANSPORT_RECURSE_SUBMODULES_CHECK)) && !is_bare_repository()) {
1189                        struct ref *ref = remote_refs;
1190                        struct string_list needs_pushing = STRING_LIST_INIT_DUP;
1191
1192                        for (; ref; ref = ref->next)
1193                                if (!is_null_sha1(ref->new_sha1) &&
1194                                    find_unpushed_submodules(ref->new_sha1,
1195                                            transport->remote->name, &needs_pushing))
1196                                        die_with_unpushed_submodules(&needs_pushing);
1197                }
1198
1199                push_ret = transport->push_refs(transport, remote_refs, flags);
1200                err = push_had_errors(remote_refs);
1201                ret = push_ret | err;
1202
1203                if (!quiet || err)
1204                        transport_print_push_status(transport->url, remote_refs,
1205                                        verbose | porcelain, porcelain,
1206                                        reject_reasons);
1207
1208                if (flags & TRANSPORT_PUSH_SET_UPSTREAM)
1209                        set_upstreams(transport, remote_refs, pretend);
1210
1211                if (!(flags & TRANSPORT_PUSH_DRY_RUN)) {
1212                        struct ref *ref;
1213                        for (ref = remote_refs; ref; ref = ref->next)
1214                                transport_update_tracking_ref(transport->remote, ref, verbose);
1215                }
1216
1217                if (porcelain && !push_ret)
1218                        puts("Done");
1219                else if (!quiet && !ret && !transport_refs_pushed(remote_refs))
1220                        fprintf(stderr, "Everything up-to-date\n");
1221
1222                return ret;
1223        }
1224        return 1;
1225}
1226
1227const struct ref *transport_get_remote_refs(struct transport *transport)
1228{
1229        if (!transport->got_remote_refs) {
1230                transport->remote_refs = transport->get_refs_list(transport, 0);
1231                transport->got_remote_refs = 1;
1232        }
1233
1234        return transport->remote_refs;
1235}
1236
1237int transport_fetch_refs(struct transport *transport, struct ref *refs)
1238{
1239        int rc;
1240        int nr_heads = 0, nr_alloc = 0, nr_refs = 0;
1241        struct ref **heads = NULL;
1242        struct ref *rm;
1243
1244        for (rm = refs; rm; rm = rm->next) {
1245                nr_refs++;
1246                if (rm->peer_ref &&
1247                    !is_null_sha1(rm->old_sha1) &&
1248                    !hashcmp(rm->peer_ref->old_sha1, rm->old_sha1))
1249                        continue;
1250                ALLOC_GROW(heads, nr_heads + 1, nr_alloc);
1251                heads[nr_heads++] = rm;
1252        }
1253
1254        if (!nr_heads) {
1255                /*
1256                 * When deepening of a shallow repository is requested,
1257                 * then local and remote refs are likely to still be equal.
1258                 * Just feed them all to the fetch method in that case.
1259                 * This condition shouldn't be met in a non-deepening fetch
1260                 * (see builtin/fetch.c:quickfetch()).
1261                 */
1262                heads = xmalloc(nr_refs * sizeof(*heads));
1263                for (rm = refs; rm; rm = rm->next)
1264                        heads[nr_heads++] = rm;
1265        }
1266
1267        rc = transport->fetch(transport, nr_heads, heads);
1268
1269        free(heads);
1270        return rc;
1271}
1272
1273void transport_unlock_pack(struct transport *transport)
1274{
1275        if (transport->pack_lockfile) {
1276                unlink_or_warn(transport->pack_lockfile);
1277                free(transport->pack_lockfile);
1278                transport->pack_lockfile = NULL;
1279        }
1280}
1281
1282int transport_connect(struct transport *transport, const char *name,
1283                      const char *exec, int fd[2])
1284{
1285        if (transport->connect)
1286                return transport->connect(transport, name, exec, fd);
1287        else
1288                die("Operation not supported by protocol");
1289}
1290
1291int transport_disconnect(struct transport *transport)
1292{
1293        int ret = 0;
1294        if (transport->disconnect)
1295                ret = transport->disconnect(transport);
1296        free(transport);
1297        return ret;
1298}
1299
1300/*
1301 * Strip username (and password) from a URL and return
1302 * it in a newly allocated string.
1303 */
1304char *transport_anonymize_url(const char *url)
1305{
1306        char *anon_url, *scheme_prefix, *anon_part;
1307        size_t anon_len, prefix_len = 0;
1308
1309        anon_part = strchr(url, '@');
1310        if (url_is_local_not_ssh(url) || !anon_part)
1311                goto literal_copy;
1312
1313        anon_len = strlen(++anon_part);
1314        scheme_prefix = strstr(url, "://");
1315        if (!scheme_prefix) {
1316                if (!strchr(anon_part, ':'))
1317                        /* cannot be "me@there:/path/name" */
1318                        goto literal_copy;
1319        } else {
1320                const char *cp;
1321                /* make sure scheme is reasonable */
1322                for (cp = url; cp < scheme_prefix; cp++) {
1323                        switch (*cp) {
1324                                /* RFC 1738 2.1 */
1325                        case '+': case '.': case '-':
1326                                break; /* ok */
1327                        default:
1328                                if (isalnum(*cp))
1329                                        break;
1330                                /* it isn't */
1331                                goto literal_copy;
1332                        }
1333                }
1334                /* @ past the first slash does not count */
1335                cp = strchr(scheme_prefix + 3, '/');
1336                if (cp && cp < anon_part)
1337                        goto literal_copy;
1338                prefix_len = scheme_prefix - url + 3;
1339        }
1340        anon_url = xcalloc(1, 1 + prefix_len + anon_len);
1341        memcpy(anon_url, url, prefix_len);
1342        memcpy(anon_url + prefix_len, anon_part, anon_len);
1343        return anon_url;
1344literal_copy:
1345        return xstrdup(url);
1346}
1347
1348struct alternate_refs_data {
1349        alternate_ref_fn *fn;
1350        void *data;
1351};
1352
1353static int refs_from_alternate_cb(struct alternate_object_database *e,
1354                                  void *data)
1355{
1356        char *other;
1357        size_t len;
1358        struct remote *remote;
1359        struct transport *transport;
1360        const struct ref *extra;
1361        struct alternate_refs_data *cb = data;
1362
1363        e->name[-1] = '\0';
1364        other = xstrdup(real_path(e->base));
1365        e->name[-1] = '/';
1366        len = strlen(other);
1367
1368        while (other[len-1] == '/')
1369                other[--len] = '\0';
1370        if (len < 8 || memcmp(other + len - 8, "/objects", 8))
1371                goto out;
1372        /* Is this a git repository with refs? */
1373        memcpy(other + len - 8, "/refs", 6);
1374        if (!is_directory(other))
1375                goto out;
1376        other[len - 8] = '\0';
1377        remote = remote_get(other);
1378        transport = transport_get(remote, other);
1379        for (extra = transport_get_remote_refs(transport);
1380             extra;
1381             extra = extra->next)
1382                cb->fn(extra, cb->data);
1383        transport_disconnect(transport);
1384out:
1385        free(other);
1386        return 0;
1387}
1388
1389void for_each_alternate_ref(alternate_ref_fn fn, void *data)
1390{
1391        struct alternate_refs_data cb;
1392        cb.fn = fn;
1393        cb.data = data;
1394        foreach_alt_odb(refs_from_alternate_cb, &cb);
1395}