Andrew's git / gitweb.git / transport.c
?
transport.con commit t3404: fix quoting of redirect for some versions of bash (7966230)
   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
 287        /* when called via for_each_ref(), flags is non-zero */
 288        if (flags && !starts_with(name, "refs/heads/") &&
 289                        !starts_with(name, "refs/tags/"))
 290                return 0;
 291
 292        strbuf_addstr(buf, name);
 293        if (safe_create_leading_directories(buf->buf) ||
 294            write_file(buf->buf, 0, "%s\n", sha1_to_hex(sha1)))
 295                return error("problems writing temporary file %s: %s",
 296                             buf->buf, strerror(errno));
 297        strbuf_setlen(buf, len);
 298        return 0;
 299}
 300
 301static int write_refs_to_temp_dir(struct strbuf *temp_dir,
 302                int refspec_nr, const char **refspec)
 303{
 304        int i;
 305
 306        for (i = 0; i < refspec_nr; i++) {
 307                unsigned char sha1[20];
 308                char *ref;
 309
 310                if (dwim_ref(refspec[i], strlen(refspec[i]), sha1, &ref) != 1)
 311                        return error("Could not get ref %s", refspec[i]);
 312
 313                if (write_one_ref(ref, sha1, 0, temp_dir)) {
 314                        free(ref);
 315                        return -1;
 316                }
 317                free(ref);
 318        }
 319        return 0;
 320}
 321
 322static int rsync_transport_push(struct transport *transport,
 323                int refspec_nr, const char **refspec, int flags)
 324{
 325        struct strbuf buf = STRBUF_INIT, temp_dir = STRBUF_INIT;
 326        int result = 0, i;
 327        struct child_process rsync = CHILD_PROCESS_INIT;
 328        const char *args[10];
 329
 330        if (flags & TRANSPORT_PUSH_MIRROR)
 331                return error("rsync transport does not support mirror mode");
 332
 333        /* first push the objects */
 334
 335        strbuf_addstr(&buf, rsync_url(transport->url));
 336        strbuf_addch(&buf, '/');
 337
 338        rsync.argv = args;
 339        rsync.stdout_to_stderr = 1;
 340        i = 0;
 341        args[i++] = "rsync";
 342        args[i++] = "-a";
 343        if (flags & TRANSPORT_PUSH_DRY_RUN)
 344                args[i++] = "--dry-run";
 345        if (transport->verbose > 1)
 346                args[i++] = "-v";
 347        args[i++] = "--ignore-existing";
 348        args[i++] = "--exclude";
 349        args[i++] = "info";
 350        args[i++] = get_object_directory();
 351        args[i++] = buf.buf;
 352        args[i++] = NULL;
 353
 354        if (run_command(&rsync))
 355                return error("Could not push objects to %s",
 356                                rsync_url(transport->url));
 357
 358        /* copy the refs to the temporary directory; they could be packed. */
 359
 360        strbuf_addstr(&temp_dir, git_path("rsync-refs-XXXXXX"));
 361        if (!mkdtemp(temp_dir.buf))
 362                die_errno ("Could not make temporary directory");
 363        strbuf_addch(&temp_dir, '/');
 364
 365        if (flags & TRANSPORT_PUSH_ALL) {
 366                if (for_each_ref(write_one_ref, &temp_dir))
 367                        return -1;
 368        } else if (write_refs_to_temp_dir(&temp_dir, refspec_nr, refspec))
 369                return -1;
 370
 371        i = 2;
 372        if (flags & TRANSPORT_PUSH_DRY_RUN)
 373                args[i++] = "--dry-run";
 374        if (!(flags & TRANSPORT_PUSH_FORCE))
 375                args[i++] = "--ignore-existing";
 376        args[i++] = temp_dir.buf;
 377        args[i++] = rsync_url(transport->url);
 378        args[i++] = NULL;
 379        if (run_command(&rsync))
 380                result = error("Could not push to %s",
 381                                rsync_url(transport->url));
 382
 383        if (remove_dir_recursively(&temp_dir, 0))
 384                warning ("Could not remove temporary directory %s.",
 385                                temp_dir.buf);
 386
 387        strbuf_release(&buf);
 388        strbuf_release(&temp_dir);
 389
 390        return result;
 391}
 392
 393struct bundle_transport_data {
 394        int fd;
 395        struct bundle_header header;
 396};
 397
 398static struct ref *get_refs_from_bundle(struct transport *transport, int for_push)
 399{
 400        struct bundle_transport_data *data = transport->data;
 401        struct ref *result = NULL;
 402        int i;
 403
 404        if (for_push)
 405                return NULL;
 406
 407        if (data->fd > 0)
 408                close(data->fd);
 409        data->fd = read_bundle_header(transport->url, &data->header);
 410        if (data->fd < 0)
 411                die ("Could not read bundle '%s'.", transport->url);
 412        for (i = 0; i < data->header.references.nr; i++) {
 413                struct ref_list_entry *e = data->header.references.list + i;
 414                struct ref *ref = alloc_ref(e->name);
 415                hashcpy(ref->old_sha1, e->sha1);
 416                ref->next = result;
 417                result = ref;
 418        }
 419        return result;
 420}
 421
 422static int fetch_refs_from_bundle(struct transport *transport,
 423                               int nr_heads, struct ref **to_fetch)
 424{
 425        struct bundle_transport_data *data = transport->data;
 426        return unbundle(&data->header, data->fd,
 427                        transport->progress ? BUNDLE_VERBOSE : 0);
 428}
 429
 430static int close_bundle(struct transport *transport)
 431{
 432        struct bundle_transport_data *data = transport->data;
 433        if (data->fd > 0)
 434                close(data->fd);
 435        free(data);
 436        return 0;
 437}
 438
 439struct git_transport_data {
 440        struct git_transport_options options;
 441        struct child_process *conn;
 442        int fd[2];
 443        unsigned got_remote_heads : 1;
 444        struct sha1_array extra_have;
 445        struct sha1_array shallow;
 446};
 447
 448static int set_git_option(struct git_transport_options *opts,
 449                          const char *name, const char *value)
 450{
 451        if (!strcmp(name, TRANS_OPT_UPLOADPACK)) {
 452                opts->uploadpack = value;
 453                return 0;
 454        } else if (!strcmp(name, TRANS_OPT_RECEIVEPACK)) {
 455                opts->receivepack = value;
 456                return 0;
 457        } else if (!strcmp(name, TRANS_OPT_THIN)) {
 458                opts->thin = !!value;
 459                return 0;
 460        } else if (!strcmp(name, TRANS_OPT_FOLLOWTAGS)) {
 461                opts->followtags = !!value;
 462                return 0;
 463        } else if (!strcmp(name, TRANS_OPT_KEEP)) {
 464                opts->keep = !!value;
 465                return 0;
 466        } else if (!strcmp(name, TRANS_OPT_UPDATE_SHALLOW)) {
 467                opts->update_shallow = !!value;
 468                return 0;
 469        } else if (!strcmp(name, TRANS_OPT_DEPTH)) {
 470                if (!value)
 471                        opts->depth = 0;
 472                else {
 473                        char *end;
 474                        opts->depth = strtol(value, &end, 0);
 475                        if (*end)
 476                                die("transport: invalid depth option '%s'", value);
 477                }
 478                return 0;
 479        } else if (!strcmp(name, TRANS_OPT_PUSH_CERT)) {
 480                opts->push_cert = !!value;
 481                return 0;
 482        }
 483        return 1;
 484}
 485
 486static int connect_setup(struct transport *transport, int for_push, int verbose)
 487{
 488        struct git_transport_data *data = transport->data;
 489
 490        if (data->conn)
 491                return 0;
 492
 493        data->conn = git_connect(data->fd, transport->url,
 494                                 for_push ? data->options.receivepack :
 495                                 data->options.uploadpack,
 496                                 verbose ? CONNECT_VERBOSE : 0);
 497
 498        return 0;
 499}
 500
 501static struct ref *get_refs_via_connect(struct transport *transport, int for_push)
 502{
 503        struct git_transport_data *data = transport->data;
 504        struct ref *refs;
 505
 506        connect_setup(transport, for_push, 0);
 507        get_remote_heads(data->fd[0], NULL, 0, &refs,
 508                         for_push ? REF_NORMAL : 0,
 509                         &data->extra_have,
 510                         &data->shallow);
 511        data->got_remote_heads = 1;
 512
 513        return refs;
 514}
 515
 516static int fetch_refs_via_pack(struct transport *transport,
 517                               int nr_heads, struct ref **to_fetch)
 518{
 519        struct git_transport_data *data = transport->data;
 520        struct ref *refs;
 521        char *dest = xstrdup(transport->url);
 522        struct fetch_pack_args args;
 523        struct ref *refs_tmp = NULL;
 524
 525        memset(&args, 0, sizeof(args));
 526        args.uploadpack = data->options.uploadpack;
 527        args.keep_pack = data->options.keep;
 528        args.lock_pack = 1;
 529        args.use_thin_pack = data->options.thin;
 530        args.include_tag = data->options.followtags;
 531        args.verbose = (transport->verbose > 1);
 532        args.quiet = (transport->verbose < 0);
 533        args.no_progress = !transport->progress;
 534        args.depth = data->options.depth;
 535        args.check_self_contained_and_connected =
 536                data->options.check_self_contained_and_connected;
 537        args.cloning = transport->cloning;
 538        args.update_shallow = data->options.update_shallow;
 539
 540        if (!data->got_remote_heads) {
 541                connect_setup(transport, 0, 0);
 542                get_remote_heads(data->fd[0], NULL, 0, &refs_tmp, 0,
 543                                 NULL, &data->shallow);
 544                data->got_remote_heads = 1;
 545        }
 546
 547        refs = fetch_pack(&args, data->fd, data->conn,
 548                          refs_tmp ? refs_tmp : transport->remote_refs,
 549                          dest, to_fetch, nr_heads, &data->shallow,
 550                          &transport->pack_lockfile);
 551        close(data->fd[0]);
 552        close(data->fd[1]);
 553        if (finish_connect(data->conn)) {
 554                free_refs(refs);
 555                refs = NULL;
 556        }
 557        data->conn = NULL;
 558        data->got_remote_heads = 0;
 559        data->options.self_contained_and_connected =
 560                args.self_contained_and_connected;
 561
 562        free_refs(refs_tmp);
 563        free_refs(refs);
 564        free(dest);
 565        return (refs ? 0 : -1);
 566}
 567
 568static int push_had_errors(struct ref *ref)
 569{
 570        for (; ref; ref = ref->next) {
 571                switch (ref->status) {
 572                case REF_STATUS_NONE:
 573                case REF_STATUS_UPTODATE:
 574                case REF_STATUS_OK:
 575                        break;
 576                default:
 577                        return 1;
 578                }
 579        }
 580        return 0;
 581}
 582
 583int transport_refs_pushed(struct ref *ref)
 584{
 585        for (; ref; ref = ref->next) {
 586                switch(ref->status) {
 587                case REF_STATUS_NONE:
 588                case REF_STATUS_UPTODATE:
 589                        break;
 590                default:
 591                        return 1;
 592                }
 593        }
 594        return 0;
 595}
 596
 597void transport_update_tracking_ref(struct remote *remote, struct ref *ref, int verbose)
 598{
 599        struct refspec rs;
 600
 601        if (ref->status != REF_STATUS_OK && ref->status != REF_STATUS_UPTODATE)
 602                return;
 603
 604        rs.src = ref->name;
 605        rs.dst = NULL;
 606
 607        if (!remote_find_tracking(remote, &rs)) {
 608                if (verbose)
 609                        fprintf(stderr, "updating local tracking ref '%s'\n", rs.dst);
 610                if (ref->deletion) {
 611                        delete_ref(rs.dst, NULL, 0);
 612                } else
 613                        update_ref("update by push", rs.dst,
 614                                        ref->new_sha1, NULL, 0, 0);
 615                free(rs.dst);
 616        }
 617}
 618
 619static void print_ref_status(char flag, const char *summary, struct ref *to, struct ref *from, const char *msg, int porcelain)
 620{
 621        if (porcelain) {
 622                if (from)
 623                        fprintf(stdout, "%c\t%s:%s\t", flag, from->name, to->name);
 624                else
 625                        fprintf(stdout, "%c\t:%s\t", flag, to->name);
 626                if (msg)
 627                        fprintf(stdout, "%s (%s)\n", summary, msg);
 628                else
 629                        fprintf(stdout, "%s\n", summary);
 630        } else {
 631                fprintf(stderr, " %c %-*s ", flag, TRANSPORT_SUMMARY_WIDTH, summary);
 632                if (from)
 633                        fprintf(stderr, "%s -> %s", prettify_refname(from->name), prettify_refname(to->name));
 634                else
 635                        fputs(prettify_refname(to->name), stderr);
 636                if (msg) {
 637                        fputs(" (", stderr);
 638                        fputs(msg, stderr);
 639                        fputc(')', stderr);
 640                }
 641                fputc('\n', stderr);
 642        }
 643}
 644
 645static const char *status_abbrev(unsigned char sha1[20])
 646{
 647        return find_unique_abbrev(sha1, DEFAULT_ABBREV);
 648}
 649
 650static void print_ok_ref_status(struct ref *ref, int porcelain)
 651{
 652        if (ref->deletion)
 653                print_ref_status('-', "[deleted]", ref, NULL, NULL, porcelain);
 654        else if (is_null_sha1(ref->old_sha1))
 655                print_ref_status('*',
 656                        (starts_with(ref->name, "refs/tags/") ? "[new tag]" :
 657                        "[new branch]"),
 658                        ref, ref->peer_ref, NULL, porcelain);
 659        else {
 660                char quickref[84];
 661                char type;
 662                const char *msg;
 663
 664                strcpy(quickref, status_abbrev(ref->old_sha1));
 665                if (ref->forced_update) {
 666                        strcat(quickref, "...");
 667                        type = '+';
 668                        msg = "forced update";
 669                } else {
 670                        strcat(quickref, "..");
 671                        type = ' ';
 672                        msg = NULL;
 673                }
 674                strcat(quickref, status_abbrev(ref->new_sha1));
 675
 676                print_ref_status(type, quickref, ref, ref->peer_ref, msg, porcelain);
 677        }
 678}
 679
 680static int print_one_push_status(struct ref *ref, const char *dest, int count, int porcelain)
 681{
 682        if (!count)
 683                fprintf(porcelain ? stdout : stderr, "To %s\n", dest);
 684
 685        switch(ref->status) {
 686        case REF_STATUS_NONE:
 687                print_ref_status('X', "[no match]", ref, NULL, NULL, porcelain);
 688                break;
 689        case REF_STATUS_REJECT_NODELETE:
 690                print_ref_status('!', "[rejected]", ref, NULL,
 691                                                 "remote does not support deleting refs", porcelain);
 692                break;
 693        case REF_STATUS_UPTODATE:
 694                print_ref_status('=', "[up to date]", ref,
 695                                                 ref->peer_ref, NULL, porcelain);
 696                break;
 697        case REF_STATUS_REJECT_NONFASTFORWARD:
 698                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 699                                                 "non-fast-forward", porcelain);
 700                break;
 701        case REF_STATUS_REJECT_ALREADY_EXISTS:
 702                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 703                                                 "already exists", porcelain);
 704                break;
 705        case REF_STATUS_REJECT_FETCH_FIRST:
 706                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 707                                                 "fetch first", porcelain);
 708                break;
 709        case REF_STATUS_REJECT_NEEDS_FORCE:
 710                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 711                                                 "needs force", porcelain);
 712                break;
 713        case REF_STATUS_REJECT_STALE:
 714                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 715                                                 "stale info", porcelain);
 716                break;
 717        case REF_STATUS_REJECT_SHALLOW:
 718                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 719                                                 "new shallow roots not allowed", porcelain);
 720                break;
 721        case REF_STATUS_REMOTE_REJECT:
 722                print_ref_status('!', "[remote rejected]", ref,
 723                                                 ref->deletion ? NULL : ref->peer_ref,
 724                                                 ref->remote_status, porcelain);
 725                break;
 726        case REF_STATUS_EXPECTING_REPORT:
 727                print_ref_status('!', "[remote failure]", ref,
 728                                                 ref->deletion ? NULL : ref->peer_ref,
 729                                                 "remote failed to report status", porcelain);
 730                break;
 731        case REF_STATUS_ATOMIC_PUSH_FAILED:
 732                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 733                                                 "atomic push failed", porcelain);
 734                break;
 735        case REF_STATUS_OK:
 736                print_ok_ref_status(ref, porcelain);
 737                break;
 738        }
 739
 740        return 1;
 741}
 742
 743void transport_print_push_status(const char *dest, struct ref *refs,
 744                                  int verbose, int porcelain, unsigned int *reject_reasons)
 745{
 746        struct ref *ref;
 747        int n = 0;
 748        unsigned char head_sha1[20];
 749        char *head;
 750
 751        head = resolve_refdup("HEAD", RESOLVE_REF_READING, head_sha1, NULL);
 752
 753        if (verbose) {
 754                for (ref = refs; ref; ref = ref->next)
 755                        if (ref->status == REF_STATUS_UPTODATE)
 756                                n += print_one_push_status(ref, dest, n, porcelain);
 757        }
 758
 759        for (ref = refs; ref; ref = ref->next)
 760                if (ref->status == REF_STATUS_OK)
 761                        n += print_one_push_status(ref, dest, n, porcelain);
 762
 763        *reject_reasons = 0;
 764        for (ref = refs; ref; ref = ref->next) {
 765                if (ref->status != REF_STATUS_NONE &&
 766                    ref->status != REF_STATUS_UPTODATE &&
 767                    ref->status != REF_STATUS_OK)
 768                        n += print_one_push_status(ref, dest, n, porcelain);
 769                if (ref->status == REF_STATUS_REJECT_NONFASTFORWARD) {
 770                        if (head != NULL && !strcmp(head, ref->name))
 771                                *reject_reasons |= REJECT_NON_FF_HEAD;
 772                        else
 773                                *reject_reasons |= REJECT_NON_FF_OTHER;
 774                } else if (ref->status == REF_STATUS_REJECT_ALREADY_EXISTS) {
 775                        *reject_reasons |= REJECT_ALREADY_EXISTS;
 776                } else if (ref->status == REF_STATUS_REJECT_FETCH_FIRST) {
 777                        *reject_reasons |= REJECT_FETCH_FIRST;
 778                } else if (ref->status == REF_STATUS_REJECT_NEEDS_FORCE) {
 779                        *reject_reasons |= REJECT_NEEDS_FORCE;
 780                }
 781        }
 782        free(head);
 783}
 784
 785void transport_verify_remote_names(int nr_heads, const char **heads)
 786{
 787        int i;
 788
 789        for (i = 0; i < nr_heads; i++) {
 790                const char *local = heads[i];
 791                const char *remote = strrchr(heads[i], ':');
 792
 793                if (*local == '+')
 794                        local++;
 795
 796                /* A matching refspec is okay.  */
 797                if (remote == local && remote[1] == '\0')
 798                        continue;
 799
 800                remote = remote ? (remote + 1) : local;
 801                if (check_refname_format(remote,
 802                                REFNAME_ALLOW_ONELEVEL|REFNAME_REFSPEC_PATTERN))
 803                        die("remote part of refspec is not a valid name in %s",
 804                                heads[i]);
 805        }
 806}
 807
 808static int git_transport_push(struct transport *transport, struct ref *remote_refs, int flags)
 809{
 810        struct git_transport_data *data = transport->data;
 811        struct send_pack_args args;
 812        int ret;
 813
 814        if (!data->got_remote_heads) {
 815                struct ref *tmp_refs;
 816                connect_setup(transport, 1, 0);
 817
 818                get_remote_heads(data->fd[0], NULL, 0, &tmp_refs, REF_NORMAL,
 819                                 NULL, &data->shallow);
 820                data->got_remote_heads = 1;
 821        }
 822
 823        memset(&args, 0, sizeof(args));
 824        args.send_mirror = !!(flags & TRANSPORT_PUSH_MIRROR);
 825        args.force_update = !!(flags & TRANSPORT_PUSH_FORCE);
 826        args.use_thin_pack = data->options.thin;
 827        args.verbose = (transport->verbose > 0);
 828        args.quiet = (transport->verbose < 0);
 829        args.progress = transport->progress;
 830        args.dry_run = !!(flags & TRANSPORT_PUSH_DRY_RUN);
 831        args.porcelain = !!(flags & TRANSPORT_PUSH_PORCELAIN);
 832        args.push_cert = !!(flags & TRANSPORT_PUSH_CERT);
 833        args.atomic = !!(flags & TRANSPORT_PUSH_ATOMIC);
 834        args.url = transport->url;
 835
 836        ret = send_pack(&args, data->fd, data->conn, remote_refs,
 837                        &data->extra_have);
 838
 839        close(data->fd[1]);
 840        close(data->fd[0]);
 841        ret |= finish_connect(data->conn);
 842        data->conn = NULL;
 843        data->got_remote_heads = 0;
 844
 845        return ret;
 846}
 847
 848static int connect_git(struct transport *transport, const char *name,
 849                       const char *executable, int fd[2])
 850{
 851        struct git_transport_data *data = transport->data;
 852        data->conn = git_connect(data->fd, transport->url,
 853                                 executable, 0);
 854        fd[0] = data->fd[0];
 855        fd[1] = data->fd[1];
 856        return 0;
 857}
 858
 859static int disconnect_git(struct transport *transport)
 860{
 861        struct git_transport_data *data = transport->data;
 862        if (data->conn) {
 863                if (data->got_remote_heads)
 864                        packet_flush(data->fd[1]);
 865                close(data->fd[0]);
 866                close(data->fd[1]);
 867                finish_connect(data->conn);
 868        }
 869
 870        free(data);
 871        return 0;
 872}
 873
 874void transport_take_over(struct transport *transport,
 875                         struct child_process *child)
 876{
 877        struct git_transport_data *data;
 878
 879        if (!transport->smart_options)
 880                die("Bug detected: Taking over transport requires non-NULL "
 881                    "smart_options field.");
 882
 883        data = xcalloc(1, sizeof(*data));
 884        data->options = *transport->smart_options;
 885        data->conn = child;
 886        data->fd[0] = data->conn->out;
 887        data->fd[1] = data->conn->in;
 888        data->got_remote_heads = 0;
 889        transport->data = data;
 890
 891        transport->set_option = NULL;
 892        transport->get_refs_list = get_refs_via_connect;
 893        transport->fetch = fetch_refs_via_pack;
 894        transport->push = NULL;
 895        transport->push_refs = git_transport_push;
 896        transport->disconnect = disconnect_git;
 897        transport->smart_options = &(data->options);
 898
 899        transport->cannot_reuse = 1;
 900}
 901
 902static int is_file(const char *url)
 903{
 904        struct stat buf;
 905        if (stat(url, &buf))
 906                return 0;
 907        return S_ISREG(buf.st_mode);
 908}
 909
 910static int external_specification_len(const char *url)
 911{
 912        return strchr(url, ':') - url;
 913}
 914
 915struct transport *transport_get(struct remote *remote, const char *url)
 916{
 917        const char *helper;
 918        struct transport *ret = xcalloc(1, sizeof(*ret));
 919
 920        ret->progress = isatty(2);
 921
 922        if (!remote)
 923                die("No remote provided to transport_get()");
 924
 925        ret->got_remote_refs = 0;
 926        ret->remote = remote;
 927        helper = remote->foreign_vcs;
 928
 929        if (!url && remote->url)
 930                url = remote->url[0];
 931        ret->url = url;
 932
 933        /* maybe it is a foreign URL? */
 934        if (url) {
 935                const char *p = url;
 936
 937                while (is_urlschemechar(p == url, *p))
 938                        p++;
 939                if (starts_with(p, "::"))
 940                        helper = xstrndup(url, p - url);
 941        }
 942
 943        if (helper) {
 944                transport_helper_init(ret, helper);
 945        } else if (starts_with(url, "rsync:")) {
 946                ret->get_refs_list = get_refs_via_rsync;
 947                ret->fetch = fetch_objs_via_rsync;
 948                ret->push = rsync_transport_push;
 949                ret->smart_options = NULL;
 950        } else if (url_is_local_not_ssh(url) && is_file(url) && is_bundle(url, 1)) {
 951                struct bundle_transport_data *data = xcalloc(1, sizeof(*data));
 952                ret->data = data;
 953                ret->get_refs_list = get_refs_from_bundle;
 954                ret->fetch = fetch_refs_from_bundle;
 955                ret->disconnect = close_bundle;
 956                ret->smart_options = NULL;
 957        } else if (!is_url(url)
 958                || starts_with(url, "file://")
 959                || starts_with(url, "git://")
 960                || starts_with(url, "ssh://")
 961                || starts_with(url, "git+ssh://")
 962                || starts_with(url, "ssh+git://")) {
 963                /* These are builtin smart transports. */
 964                struct git_transport_data *data = xcalloc(1, sizeof(*data));
 965                ret->data = data;
 966                ret->set_option = NULL;
 967                ret->get_refs_list = get_refs_via_connect;
 968                ret->fetch = fetch_refs_via_pack;
 969                ret->push_refs = git_transport_push;
 970                ret->connect = connect_git;
 971                ret->disconnect = disconnect_git;
 972                ret->smart_options = &(data->options);
 973
 974                data->conn = NULL;
 975                data->got_remote_heads = 0;
 976        } else {
 977                /* Unknown protocol in URL. Pass to external handler. */
 978                int len = external_specification_len(url);
 979                char *handler = xmemdupz(url, len);
 980                transport_helper_init(ret, handler);
 981        }
 982
 983        if (ret->smart_options) {
 984                ret->smart_options->thin = 1;
 985                ret->smart_options->uploadpack = "git-upload-pack";
 986                if (remote->uploadpack)
 987                        ret->smart_options->uploadpack = remote->uploadpack;
 988                ret->smart_options->receivepack = "git-receive-pack";
 989                if (remote->receivepack)
 990                        ret->smart_options->receivepack = remote->receivepack;
 991        }
 992
 993        return ret;
 994}
 995
 996int transport_set_option(struct transport *transport,
 997                         const char *name, const char *value)
 998{
 999        int git_reports = 1, protocol_reports = 1;
1000
1001        if (transport->smart_options)
1002                git_reports = set_git_option(transport->smart_options,
1003                                             name, value);
1004
1005        if (transport->set_option)
1006                protocol_reports = transport->set_option(transport, name,
1007                                                        value);
1008
1009        /* If either report is 0, report 0 (success). */
1010        if (!git_reports || !protocol_reports)
1011                return 0;
1012        /* If either reports -1 (invalid value), report -1. */
1013        if ((git_reports == -1) || (protocol_reports == -1))
1014                return -1;
1015        /* Otherwise if both report unknown, report unknown. */
1016        return 1;
1017}
1018
1019void transport_set_verbosity(struct transport *transport, int verbosity,
1020        int force_progress)
1021{
1022        if (verbosity >= 1)
1023                transport->verbose = verbosity <= 3 ? verbosity : 3;
1024        if (verbosity < 0)
1025                transport->verbose = -1;
1026
1027        /**
1028         * Rules used to determine whether to report progress (processing aborts
1029         * when a rule is satisfied):
1030         *
1031         *   . Report progress, if force_progress is 1 (ie. --progress).
1032         *   . Don't report progress, if force_progress is 0 (ie. --no-progress).
1033         *   . Don't report progress, if verbosity < 0 (ie. -q/--quiet ).
1034         *   . Report progress if isatty(2) is 1.
1035         **/
1036        if (force_progress >= 0)
1037                transport->progress = !!force_progress;
1038        else
1039                transport->progress = verbosity >= 0 && isatty(2);
1040}
1041
1042static void die_with_unpushed_submodules(struct string_list *needs_pushing)
1043{
1044        int i;
1045
1046        fprintf(stderr, "The following submodule paths contain changes that can\n"
1047                        "not be found on any remote:\n");
1048        for (i = 0; i < needs_pushing->nr; i++)
1049                printf("  %s\n", needs_pushing->items[i].string);
1050        fprintf(stderr, "\nPlease try\n\n"
1051                        "       git push --recurse-submodules=on-demand\n\n"
1052                        "or cd to the path and use\n\n"
1053                        "       git push\n\n"
1054                        "to push them to a remote.\n\n");
1055
1056        string_list_clear(needs_pushing, 0);
1057
1058        die("Aborting.");
1059}
1060
1061static int run_pre_push_hook(struct transport *transport,
1062                             struct ref *remote_refs)
1063{
1064        int ret = 0, x;
1065        struct ref *r;
1066        struct child_process proc = CHILD_PROCESS_INIT;
1067        struct strbuf buf;
1068        const char *argv[4];
1069
1070        if (!(argv[0] = find_hook("pre-push")))
1071                return 0;
1072
1073        argv[1] = transport->remote->name;
1074        argv[2] = transport->url;
1075        argv[3] = NULL;
1076
1077        proc.argv = argv;
1078        proc.in = -1;
1079
1080        if (start_command(&proc)) {
1081                finish_command(&proc);
1082                return -1;
1083        }
1084
1085        strbuf_init(&buf, 256);
1086
1087        for (r = remote_refs; r; r = r->next) {
1088                if (!r->peer_ref) continue;
1089                if (r->status == REF_STATUS_REJECT_NONFASTFORWARD) continue;
1090                if (r->status == REF_STATUS_REJECT_STALE) continue;
1091                if (r->status == REF_STATUS_UPTODATE) continue;
1092
1093                strbuf_reset(&buf);
1094                strbuf_addf( &buf, "%s %s %s %s\n",
1095                         r->peer_ref->name, sha1_to_hex(r->new_sha1),
1096                         r->name, sha1_to_hex(r->old_sha1));
1097
1098                if (write_in_full(proc.in, buf.buf, buf.len) != buf.len) {
1099                        ret = -1;
1100                        break;
1101                }
1102        }
1103
1104        strbuf_release(&buf);
1105
1106        x = close(proc.in);
1107        if (!ret)
1108                ret = x;
1109
1110        x = finish_command(&proc);
1111        if (!ret)
1112                ret = x;
1113
1114        return ret;
1115}
1116
1117int transport_push(struct transport *transport,
1118                   int refspec_nr, const char **refspec, int flags,
1119                   unsigned int *reject_reasons)
1120{
1121        *reject_reasons = 0;
1122        transport_verify_remote_names(refspec_nr, refspec);
1123
1124        if (transport->push) {
1125                /* Maybe FIXME. But no important transport uses this case. */
1126                if (flags & TRANSPORT_PUSH_SET_UPSTREAM)
1127                        die("This transport does not support using --set-upstream");
1128
1129                return transport->push(transport, refspec_nr, refspec, flags);
1130        } else if (transport->push_refs) {
1131                struct ref *remote_refs;
1132                struct ref *local_refs = get_local_heads();
1133                int match_flags = MATCH_REFS_NONE;
1134                int verbose = (transport->verbose > 0);
1135                int quiet = (transport->verbose < 0);
1136                int porcelain = flags & TRANSPORT_PUSH_PORCELAIN;
1137                int pretend = flags & TRANSPORT_PUSH_DRY_RUN;
1138                int push_ret, ret, err;
1139
1140                if (check_push_refs(local_refs, refspec_nr, refspec) < 0)
1141                        return -1;
1142
1143                remote_refs = transport->get_refs_list(transport, 1);
1144
1145                if (flags & TRANSPORT_PUSH_ALL)
1146                        match_flags |= MATCH_REFS_ALL;
1147                if (flags & TRANSPORT_PUSH_MIRROR)
1148                        match_flags |= MATCH_REFS_MIRROR;
1149                if (flags & TRANSPORT_PUSH_PRUNE)
1150                        match_flags |= MATCH_REFS_PRUNE;
1151                if (flags & TRANSPORT_PUSH_FOLLOW_TAGS)
1152                        match_flags |= MATCH_REFS_FOLLOW_TAGS;
1153
1154                if (match_push_refs(local_refs, &remote_refs,
1155                                    refspec_nr, refspec, match_flags)) {
1156                        return -1;
1157                }
1158
1159                if (transport->smart_options &&
1160                    transport->smart_options->cas &&
1161                    !is_empty_cas(transport->smart_options->cas))
1162                        apply_push_cas(transport->smart_options->cas,
1163                                       transport->remote, remote_refs);
1164
1165                set_ref_status_for_push(remote_refs,
1166                        flags & TRANSPORT_PUSH_MIRROR,
1167                        flags & TRANSPORT_PUSH_FORCE);
1168
1169                if (!(flags & TRANSPORT_PUSH_NO_HOOK))
1170                        if (run_pre_push_hook(transport, remote_refs))
1171                                return -1;
1172
1173                if ((flags & TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND) && !is_bare_repository()) {
1174                        struct ref *ref = remote_refs;
1175                        for (; ref; ref = ref->next)
1176                                if (!is_null_sha1(ref->new_sha1) &&
1177                                    !push_unpushed_submodules(ref->new_sha1,
1178                                            transport->remote->name))
1179                                    die ("Failed to push all needed submodules!");
1180                }
1181
1182                if ((flags & (TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND |
1183                              TRANSPORT_RECURSE_SUBMODULES_CHECK)) && !is_bare_repository()) {
1184                        struct ref *ref = remote_refs;
1185                        struct string_list needs_pushing = STRING_LIST_INIT_DUP;
1186
1187                        for (; ref; ref = ref->next)
1188                                if (!is_null_sha1(ref->new_sha1) &&
1189                                    find_unpushed_submodules(ref->new_sha1,
1190                                            transport->remote->name, &needs_pushing))
1191                                        die_with_unpushed_submodules(&needs_pushing);
1192                }
1193
1194                push_ret = transport->push_refs(transport, remote_refs, flags);
1195                err = push_had_errors(remote_refs);
1196                ret = push_ret | err;
1197
1198                if (!quiet || err)
1199                        transport_print_push_status(transport->url, remote_refs,
1200                                        verbose | porcelain, porcelain,
1201                                        reject_reasons);
1202
1203                if (flags & TRANSPORT_PUSH_SET_UPSTREAM)
1204                        set_upstreams(transport, remote_refs, pretend);
1205
1206                if (!(flags & TRANSPORT_PUSH_DRY_RUN)) {
1207                        struct ref *ref;
1208                        for (ref = remote_refs; ref; ref = ref->next)
1209                                transport_update_tracking_ref(transport->remote, ref, verbose);
1210                }
1211
1212                if (porcelain && !push_ret)
1213                        puts("Done");
1214                else if (!quiet && !ret && !transport_refs_pushed(remote_refs))
1215                        fprintf(stderr, "Everything up-to-date\n");
1216
1217                return ret;
1218        }
1219        return 1;
1220}
1221
1222const struct ref *transport_get_remote_refs(struct transport *transport)
1223{
1224        if (!transport->got_remote_refs) {
1225                transport->remote_refs = transport->get_refs_list(transport, 0);
1226                transport->got_remote_refs = 1;
1227        }
1228
1229        return transport->remote_refs;
1230}
1231
1232int transport_fetch_refs(struct transport *transport, struct ref *refs)
1233{
1234        int rc;
1235        int nr_heads = 0, nr_alloc = 0, nr_refs = 0;
1236        struct ref **heads = NULL;
1237        struct ref *rm;
1238
1239        for (rm = refs; rm; rm = rm->next) {
1240                nr_refs++;
1241                if (rm->peer_ref &&
1242                    !is_null_sha1(rm->old_sha1) &&
1243                    !hashcmp(rm->peer_ref->old_sha1, rm->old_sha1))
1244                        continue;
1245                ALLOC_GROW(heads, nr_heads + 1, nr_alloc);
1246                heads[nr_heads++] = rm;
1247        }
1248
1249        if (!nr_heads) {
1250                /*
1251                 * When deepening of a shallow repository is requested,
1252                 * then local and remote refs are likely to still be equal.
1253                 * Just feed them all to the fetch method in that case.
1254                 * This condition shouldn't be met in a non-deepening fetch
1255                 * (see builtin/fetch.c:quickfetch()).
1256                 */
1257                heads = xmalloc(nr_refs * sizeof(*heads));
1258                for (rm = refs; rm; rm = rm->next)
1259                        heads[nr_heads++] = rm;
1260        }
1261
1262        rc = transport->fetch(transport, nr_heads, heads);
1263
1264        free(heads);
1265        return rc;
1266}
1267
1268void transport_unlock_pack(struct transport *transport)
1269{
1270        if (transport->pack_lockfile) {
1271                unlink_or_warn(transport->pack_lockfile);
1272                free(transport->pack_lockfile);
1273                transport->pack_lockfile = NULL;
1274        }
1275}
1276
1277int transport_connect(struct transport *transport, const char *name,
1278                      const char *exec, int fd[2])
1279{
1280        if (transport->connect)
1281                return transport->connect(transport, name, exec, fd);
1282        else
1283                die("Operation not supported by protocol");
1284}
1285
1286int transport_disconnect(struct transport *transport)
1287{
1288        int ret = 0;
1289        if (transport->disconnect)
1290                ret = transport->disconnect(transport);
1291        free(transport);
1292        return ret;
1293}
1294
1295/*
1296 * Strip username (and password) from a URL and return
1297 * it in a newly allocated string.
1298 */
1299char *transport_anonymize_url(const char *url)
1300{
1301        char *anon_url, *scheme_prefix, *anon_part;
1302        size_t anon_len, prefix_len = 0;
1303
1304        anon_part = strchr(url, '@');
1305        if (url_is_local_not_ssh(url) || !anon_part)
1306                goto literal_copy;
1307
1308        anon_len = strlen(++anon_part);
1309        scheme_prefix = strstr(url, "://");
1310        if (!scheme_prefix) {
1311                if (!strchr(anon_part, ':'))
1312                        /* cannot be "me@there:/path/name" */
1313                        goto literal_copy;
1314        } else {
1315                const char *cp;
1316                /* make sure scheme is reasonable */
1317                for (cp = url; cp < scheme_prefix; cp++) {
1318                        switch (*cp) {
1319                                /* RFC 1738 2.1 */
1320                        case '+': case '.': case '-':
1321                                break; /* ok */
1322                        default:
1323                                if (isalnum(*cp))
1324                                        break;
1325                                /* it isn't */
1326                                goto literal_copy;
1327                        }
1328                }
1329                /* @ past the first slash does not count */
1330                cp = strchr(scheme_prefix + 3, '/');
1331                if (cp && cp < anon_part)
1332                        goto literal_copy;
1333                prefix_len = scheme_prefix - url + 3;
1334        }
1335        anon_url = xcalloc(1, 1 + prefix_len + anon_len);
1336        memcpy(anon_url, url, prefix_len);
1337        memcpy(anon_url + prefix_len, anon_part, anon_len);
1338        return anon_url;
1339literal_copy:
1340        return xstrdup(url);
1341}
1342
1343struct alternate_refs_data {
1344        alternate_ref_fn *fn;
1345        void *data;
1346};
1347
1348static int refs_from_alternate_cb(struct alternate_object_database *e,
1349                                  void *data)
1350{
1351        char *other;
1352        size_t len;
1353        struct remote *remote;
1354        struct transport *transport;
1355        const struct ref *extra;
1356        struct alternate_refs_data *cb = data;
1357
1358        e->name[-1] = '\0';
1359        other = xstrdup(real_path(e->base));
1360        e->name[-1] = '/';
1361        len = strlen(other);
1362
1363        while (other[len-1] == '/')
1364                other[--len] = '\0';
1365        if (len < 8 || memcmp(other + len - 8, "/objects", 8))
1366                goto out;
1367        /* Is this a git repository with refs? */
1368        memcpy(other + len - 8, "/refs", 6);
1369        if (!is_directory(other))
1370                goto out;
1371        other[len - 8] = '\0';
1372        remote = remote_get(other);
1373        transport = transport_get(remote, other);
1374        for (extra = transport_get_remote_refs(transport);
1375             extra;
1376             extra = extra->next)
1377                cb->fn(extra, cb->data);
1378        transport_disconnect(transport);
1379out:
1380        free(other);
1381        return 0;
1382}
1383
1384void for_each_alternate_ref(alternate_ref_fn fn, void *data)
1385{
1386        struct alternate_refs_data cb;
1387        cb.fn = fn;
1388        cb.data = data;
1389        foreach_alt_odb(refs_from_alternate_cb, &cb);
1390}