transport.con commit daemon: move daemonize() to libgit.a (de0957c)
   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 (hexval(buffer[0]) > 0xf)
 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, sha, 1, &flag);
 172                if (tmp && flag & REF_ISSYMREF &&
 173                        starts_with(tmp, "refs/heads/"))
 174                        localname = tmp;
 175
 176                /* Both source and destination must be local branches. */
 177                if (!localname || !starts_with(localname, "refs/heads/"))
 178                        continue;
 179                if (!remotename || !starts_with(remotename, "refs/heads/"))
 180                        continue;
 181
 182                if (!pretend)
 183                        install_branch_config(BRANCH_CONFIG_VERBOSE,
 184                                localname + 11, transport->remote->name,
 185                                remotename);
 186                else
 187                        printf("Would set upstream of '%s' to '%s' of '%s'\n",
 188                                localname + 11, remotename + 11,
 189                                transport->remote->name);
 190        }
 191}
 192
 193static const char *rsync_url(const char *url)
 194{
 195        return !starts_with(url, "rsync://") ? skip_prefix(url, "rsync:") : url;
 196}
 197
 198static struct ref *get_refs_via_rsync(struct transport *transport, int for_push)
 199{
 200        struct strbuf buf = STRBUF_INIT, temp_dir = STRBUF_INIT;
 201        struct ref dummy = {NULL}, *tail = &dummy;
 202        struct child_process rsync;
 203        const char *args[5];
 204        int temp_dir_len;
 205
 206        if (for_push)
 207                return NULL;
 208
 209        /* copy the refs to the temporary directory */
 210
 211        strbuf_addstr(&temp_dir, git_path("rsync-refs-XXXXXX"));
 212        if (!mkdtemp(temp_dir.buf))
 213                die_errno ("Could not make temporary directory");
 214        temp_dir_len = temp_dir.len;
 215
 216        strbuf_addstr(&buf, rsync_url(transport->url));
 217        strbuf_addstr(&buf, "/refs");
 218
 219        memset(&rsync, 0, sizeof(rsync));
 220        rsync.argv = args;
 221        rsync.stdout_to_stderr = 1;
 222        args[0] = "rsync";
 223        args[1] = (transport->verbose > 1) ? "-rv" : "-r";
 224        args[2] = buf.buf;
 225        args[3] = temp_dir.buf;
 226        args[4] = NULL;
 227
 228        if (run_command(&rsync))
 229                die ("Could not run rsync to get refs");
 230
 231        strbuf_reset(&buf);
 232        strbuf_addstr(&buf, rsync_url(transport->url));
 233        strbuf_addstr(&buf, "/packed-refs");
 234
 235        args[2] = buf.buf;
 236
 237        if (run_command(&rsync))
 238                die ("Could not run rsync to get refs");
 239
 240        /* read the copied refs */
 241
 242        strbuf_addstr(&temp_dir, "/refs");
 243        read_loose_refs(&temp_dir, temp_dir_len + 1, &tail);
 244        strbuf_setlen(&temp_dir, temp_dir_len);
 245
 246        tail = &dummy;
 247        strbuf_addstr(&temp_dir, "/packed-refs");
 248        insert_packed_refs(temp_dir.buf, &tail);
 249        strbuf_setlen(&temp_dir, temp_dir_len);
 250
 251        if (remove_dir_recursively(&temp_dir, 0))
 252                warning ("Error removing temporary directory %s.",
 253                                temp_dir.buf);
 254
 255        strbuf_release(&buf);
 256        strbuf_release(&temp_dir);
 257
 258        return dummy.next;
 259}
 260
 261static int fetch_objs_via_rsync(struct transport *transport,
 262                                int nr_objs, struct ref **to_fetch)
 263{
 264        struct strbuf buf = STRBUF_INIT;
 265        struct child_process rsync;
 266        const char *args[8];
 267        int result;
 268
 269        strbuf_addstr(&buf, rsync_url(transport->url));
 270        strbuf_addstr(&buf, "/objects/");
 271
 272        memset(&rsync, 0, sizeof(rsync));
 273        rsync.argv = args;
 274        rsync.stdout_to_stderr = 1;
 275        args[0] = "rsync";
 276        args[1] = (transport->verbose > 1) ? "-rv" : "-r";
 277        args[2] = "--ignore-existing";
 278        args[3] = "--exclude";
 279        args[4] = "info";
 280        args[5] = buf.buf;
 281        args[6] = get_object_directory();
 282        args[7] = NULL;
 283
 284        /* NEEDSWORK: handle one level of alternates */
 285        result = run_command(&rsync);
 286
 287        strbuf_release(&buf);
 288
 289        return result;
 290}
 291
 292static int write_one_ref(const char *name, const unsigned char *sha1,
 293                int flags, void *data)
 294{
 295        struct strbuf *buf = data;
 296        int len = buf->len;
 297        FILE *f;
 298
 299        /* when called via for_each_ref(), flags is non-zero */
 300        if (flags && !starts_with(name, "refs/heads/") &&
 301                        !starts_with(name, "refs/tags/"))
 302                return 0;
 303
 304        strbuf_addstr(buf, name);
 305        if (safe_create_leading_directories(buf->buf) ||
 306                        !(f = fopen(buf->buf, "w")) ||
 307                        fprintf(f, "%s\n", sha1_to_hex(sha1)) < 0 ||
 308                        fclose(f))
 309                return error("problems writing temporary file %s", buf->buf);
 310        strbuf_setlen(buf, len);
 311        return 0;
 312}
 313
 314static int write_refs_to_temp_dir(struct strbuf *temp_dir,
 315                int refspec_nr, const char **refspec)
 316{
 317        int i;
 318
 319        for (i = 0; i < refspec_nr; i++) {
 320                unsigned char sha1[20];
 321                char *ref;
 322
 323                if (dwim_ref(refspec[i], strlen(refspec[i]), sha1, &ref) != 1)
 324                        return error("Could not get ref %s", refspec[i]);
 325
 326                if (write_one_ref(ref, sha1, 0, temp_dir)) {
 327                        free(ref);
 328                        return -1;
 329                }
 330                free(ref);
 331        }
 332        return 0;
 333}
 334
 335static int rsync_transport_push(struct transport *transport,
 336                int refspec_nr, const char **refspec, int flags)
 337{
 338        struct strbuf buf = STRBUF_INIT, temp_dir = STRBUF_INIT;
 339        int result = 0, i;
 340        struct child_process rsync;
 341        const char *args[10];
 342
 343        if (flags & TRANSPORT_PUSH_MIRROR)
 344                return error("rsync transport does not support mirror mode");
 345
 346        /* first push the objects */
 347
 348        strbuf_addstr(&buf, rsync_url(transport->url));
 349        strbuf_addch(&buf, '/');
 350
 351        memset(&rsync, 0, sizeof(rsync));
 352        rsync.argv = args;
 353        rsync.stdout_to_stderr = 1;
 354        i = 0;
 355        args[i++] = "rsync";
 356        args[i++] = "-a";
 357        if (flags & TRANSPORT_PUSH_DRY_RUN)
 358                args[i++] = "--dry-run";
 359        if (transport->verbose > 1)
 360                args[i++] = "-v";
 361        args[i++] = "--ignore-existing";
 362        args[i++] = "--exclude";
 363        args[i++] = "info";
 364        args[i++] = get_object_directory();
 365        args[i++] = buf.buf;
 366        args[i++] = NULL;
 367
 368        if (run_command(&rsync))
 369                return error("Could not push objects to %s",
 370                                rsync_url(transport->url));
 371
 372        /* copy the refs to the temporary directory; they could be packed. */
 373
 374        strbuf_addstr(&temp_dir, git_path("rsync-refs-XXXXXX"));
 375        if (!mkdtemp(temp_dir.buf))
 376                die_errno ("Could not make temporary directory");
 377        strbuf_addch(&temp_dir, '/');
 378
 379        if (flags & TRANSPORT_PUSH_ALL) {
 380                if (for_each_ref(write_one_ref, &temp_dir))
 381                        return -1;
 382        } else if (write_refs_to_temp_dir(&temp_dir, refspec_nr, refspec))
 383                return -1;
 384
 385        i = 2;
 386        if (flags & TRANSPORT_PUSH_DRY_RUN)
 387                args[i++] = "--dry-run";
 388        if (!(flags & TRANSPORT_PUSH_FORCE))
 389                args[i++] = "--ignore-existing";
 390        args[i++] = temp_dir.buf;
 391        args[i++] = rsync_url(transport->url);
 392        args[i++] = NULL;
 393        if (run_command(&rsync))
 394                result = error("Could not push to %s",
 395                                rsync_url(transport->url));
 396
 397        if (remove_dir_recursively(&temp_dir, 0))
 398                warning ("Could not remove temporary directory %s.",
 399                                temp_dir.buf);
 400
 401        strbuf_release(&buf);
 402        strbuf_release(&temp_dir);
 403
 404        return result;
 405}
 406
 407struct bundle_transport_data {
 408        int fd;
 409        struct bundle_header header;
 410};
 411
 412static struct ref *get_refs_from_bundle(struct transport *transport, int for_push)
 413{
 414        struct bundle_transport_data *data = transport->data;
 415        struct ref *result = NULL;
 416        int i;
 417
 418        if (for_push)
 419                return NULL;
 420
 421        if (data->fd > 0)
 422                close(data->fd);
 423        data->fd = read_bundle_header(transport->url, &data->header);
 424        if (data->fd < 0)
 425                die ("Could not read bundle '%s'.", transport->url);
 426        for (i = 0; i < data->header.references.nr; i++) {
 427                struct ref_list_entry *e = data->header.references.list + i;
 428                struct ref *ref = alloc_ref(e->name);
 429                hashcpy(ref->old_sha1, e->sha1);
 430                ref->next = result;
 431                result = ref;
 432        }
 433        return result;
 434}
 435
 436static int fetch_refs_from_bundle(struct transport *transport,
 437                               int nr_heads, struct ref **to_fetch)
 438{
 439        struct bundle_transport_data *data = transport->data;
 440        return unbundle(&data->header, data->fd,
 441                        transport->progress ? BUNDLE_VERBOSE : 0);
 442}
 443
 444static int close_bundle(struct transport *transport)
 445{
 446        struct bundle_transport_data *data = transport->data;
 447        if (data->fd > 0)
 448                close(data->fd);
 449        free(data);
 450        return 0;
 451}
 452
 453struct git_transport_data {
 454        struct git_transport_options options;
 455        struct child_process *conn;
 456        int fd[2];
 457        unsigned got_remote_heads : 1;
 458        struct sha1_array extra_have;
 459        struct sha1_array shallow;
 460};
 461
 462static int set_git_option(struct git_transport_options *opts,
 463                          const char *name, const char *value)
 464{
 465        if (!strcmp(name, TRANS_OPT_UPLOADPACK)) {
 466                opts->uploadpack = value;
 467                return 0;
 468        } else if (!strcmp(name, TRANS_OPT_RECEIVEPACK)) {
 469                opts->receivepack = value;
 470                return 0;
 471        } else if (!strcmp(name, TRANS_OPT_THIN)) {
 472                opts->thin = !!value;
 473                return 0;
 474        } else if (!strcmp(name, TRANS_OPT_FOLLOWTAGS)) {
 475                opts->followtags = !!value;
 476                return 0;
 477        } else if (!strcmp(name, TRANS_OPT_KEEP)) {
 478                opts->keep = !!value;
 479                return 0;
 480        } else if (!strcmp(name, TRANS_OPT_UPDATE_SHALLOW)) {
 481                opts->update_shallow = !!value;
 482                return 0;
 483        } else if (!strcmp(name, TRANS_OPT_DEPTH)) {
 484                if (!value)
 485                        opts->depth = 0;
 486                else {
 487                        char *end;
 488                        opts->depth = strtol(value, &end, 0);
 489                        if (*end)
 490                                die("transport: invalid depth option '%s'", value);
 491                }
 492                return 0;
 493        }
 494        return 1;
 495}
 496
 497static int connect_setup(struct transport *transport, int for_push, int verbose)
 498{
 499        struct git_transport_data *data = transport->data;
 500
 501        if (data->conn)
 502                return 0;
 503
 504        data->conn = git_connect(data->fd, transport->url,
 505                                 for_push ? data->options.receivepack :
 506                                 data->options.uploadpack,
 507                                 verbose ? CONNECT_VERBOSE : 0);
 508
 509        return 0;
 510}
 511
 512static struct ref *get_refs_via_connect(struct transport *transport, int for_push)
 513{
 514        struct git_transport_data *data = transport->data;
 515        struct ref *refs;
 516
 517        connect_setup(transport, for_push, 0);
 518        get_remote_heads(data->fd[0], NULL, 0, &refs,
 519                         for_push ? REF_NORMAL : 0,
 520                         &data->extra_have,
 521                         &data->shallow);
 522        data->got_remote_heads = 1;
 523
 524        return refs;
 525}
 526
 527static int fetch_refs_via_pack(struct transport *transport,
 528                               int nr_heads, struct ref **to_fetch)
 529{
 530        struct git_transport_data *data = transport->data;
 531        const struct ref *refs;
 532        char *dest = xstrdup(transport->url);
 533        struct fetch_pack_args args;
 534        struct ref *refs_tmp = NULL;
 535
 536        memset(&args, 0, sizeof(args));
 537        args.uploadpack = data->options.uploadpack;
 538        args.keep_pack = data->options.keep;
 539        args.lock_pack = 1;
 540        args.use_thin_pack = data->options.thin;
 541        args.include_tag = data->options.followtags;
 542        args.verbose = (transport->verbose > 1);
 543        args.quiet = (transport->verbose < 0);
 544        args.no_progress = !transport->progress;
 545        args.depth = data->options.depth;
 546        args.check_self_contained_and_connected =
 547                data->options.check_self_contained_and_connected;
 548        args.cloning = transport->cloning;
 549        args.update_shallow = data->options.update_shallow;
 550
 551        if (!data->got_remote_heads) {
 552                connect_setup(transport, 0, 0);
 553                get_remote_heads(data->fd[0], NULL, 0, &refs_tmp, 0,
 554                                 NULL, &data->shallow);
 555                data->got_remote_heads = 1;
 556        }
 557
 558        refs = fetch_pack(&args, data->fd, data->conn,
 559                          refs_tmp ? refs_tmp : transport->remote_refs,
 560                          dest, to_fetch, nr_heads, &data->shallow,
 561                          &transport->pack_lockfile);
 562        close(data->fd[0]);
 563        close(data->fd[1]);
 564        if (finish_connect(data->conn))
 565                refs = NULL;
 566        data->conn = NULL;
 567        data->got_remote_heads = 0;
 568        data->options.self_contained_and_connected =
 569                args.self_contained_and_connected;
 570
 571        free_refs(refs_tmp);
 572
 573        free(dest);
 574        return (refs ? 0 : -1);
 575}
 576
 577static int push_had_errors(struct ref *ref)
 578{
 579        for (; ref; ref = ref->next) {
 580                switch (ref->status) {
 581                case REF_STATUS_NONE:
 582                case REF_STATUS_UPTODATE:
 583                case REF_STATUS_OK:
 584                        break;
 585                default:
 586                        return 1;
 587                }
 588        }
 589        return 0;
 590}
 591
 592int transport_refs_pushed(struct ref *ref)
 593{
 594        for (; ref; ref = ref->next) {
 595                switch(ref->status) {
 596                case REF_STATUS_NONE:
 597                case REF_STATUS_UPTODATE:
 598                        break;
 599                default:
 600                        return 1;
 601                }
 602        }
 603        return 0;
 604}
 605
 606void transport_update_tracking_ref(struct remote *remote, struct ref *ref, int verbose)
 607{
 608        struct refspec rs;
 609
 610        if (ref->status != REF_STATUS_OK && ref->status != REF_STATUS_UPTODATE)
 611                return;
 612
 613        rs.src = ref->name;
 614        rs.dst = NULL;
 615
 616        if (!remote_find_tracking(remote, &rs)) {
 617                if (verbose)
 618                        fprintf(stderr, "updating local tracking ref '%s'\n", rs.dst);
 619                if (ref->deletion) {
 620                        delete_ref(rs.dst, NULL, 0);
 621                } else
 622                        update_ref("update by push", rs.dst,
 623                                        ref->new_sha1, NULL, 0, 0);
 624                free(rs.dst);
 625        }
 626}
 627
 628static void print_ref_status(char flag, const char *summary, struct ref *to, struct ref *from, const char *msg, int porcelain)
 629{
 630        if (porcelain) {
 631                if (from)
 632                        fprintf(stdout, "%c\t%s:%s\t", flag, from->name, to->name);
 633                else
 634                        fprintf(stdout, "%c\t:%s\t", flag, to->name);
 635                if (msg)
 636                        fprintf(stdout, "%s (%s)\n", summary, msg);
 637                else
 638                        fprintf(stdout, "%s\n", summary);
 639        } else {
 640                fprintf(stderr, " %c %-*s ", flag, TRANSPORT_SUMMARY_WIDTH, summary);
 641                if (from)
 642                        fprintf(stderr, "%s -> %s", prettify_refname(from->name), prettify_refname(to->name));
 643                else
 644                        fputs(prettify_refname(to->name), stderr);
 645                if (msg) {
 646                        fputs(" (", stderr);
 647                        fputs(msg, stderr);
 648                        fputc(')', stderr);
 649                }
 650                fputc('\n', stderr);
 651        }
 652}
 653
 654static const char *status_abbrev(unsigned char sha1[20])
 655{
 656        return find_unique_abbrev(sha1, DEFAULT_ABBREV);
 657}
 658
 659static void print_ok_ref_status(struct ref *ref, int porcelain)
 660{
 661        if (ref->deletion)
 662                print_ref_status('-', "[deleted]", ref, NULL, NULL, porcelain);
 663        else if (is_null_sha1(ref->old_sha1))
 664                print_ref_status('*',
 665                        (starts_with(ref->name, "refs/tags/") ? "[new tag]" :
 666                        "[new branch]"),
 667                        ref, ref->peer_ref, NULL, porcelain);
 668        else {
 669                char quickref[84];
 670                char type;
 671                const char *msg;
 672
 673                strcpy(quickref, status_abbrev(ref->old_sha1));
 674                if (ref->forced_update) {
 675                        strcat(quickref, "...");
 676                        type = '+';
 677                        msg = "forced update";
 678                } else {
 679                        strcat(quickref, "..");
 680                        type = ' ';
 681                        msg = NULL;
 682                }
 683                strcat(quickref, status_abbrev(ref->new_sha1));
 684
 685                print_ref_status(type, quickref, ref, ref->peer_ref, msg, porcelain);
 686        }
 687}
 688
 689static int print_one_push_status(struct ref *ref, const char *dest, int count, int porcelain)
 690{
 691        if (!count)
 692                fprintf(porcelain ? stdout : stderr, "To %s\n", dest);
 693
 694        switch(ref->status) {
 695        case REF_STATUS_NONE:
 696                print_ref_status('X', "[no match]", ref, NULL, NULL, porcelain);
 697                break;
 698        case REF_STATUS_REJECT_NODELETE:
 699                print_ref_status('!', "[rejected]", ref, NULL,
 700                                                 "remote does not support deleting refs", porcelain);
 701                break;
 702        case REF_STATUS_UPTODATE:
 703                print_ref_status('=', "[up to date]", ref,
 704                                                 ref->peer_ref, NULL, porcelain);
 705                break;
 706        case REF_STATUS_REJECT_NONFASTFORWARD:
 707                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 708                                                 "non-fast-forward", porcelain);
 709                break;
 710        case REF_STATUS_REJECT_ALREADY_EXISTS:
 711                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 712                                                 "already exists", porcelain);
 713                break;
 714        case REF_STATUS_REJECT_FETCH_FIRST:
 715                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 716                                                 "fetch first", porcelain);
 717                break;
 718        case REF_STATUS_REJECT_NEEDS_FORCE:
 719                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 720                                                 "needs force", porcelain);
 721                break;
 722        case REF_STATUS_REJECT_STALE:
 723                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 724                                                 "stale info", porcelain);
 725                break;
 726        case REF_STATUS_REJECT_SHALLOW:
 727                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 728                                                 "new shallow roots not allowed", porcelain);
 729                break;
 730        case REF_STATUS_REMOTE_REJECT:
 731                print_ref_status('!', "[remote rejected]", ref,
 732                                                 ref->deletion ? NULL : ref->peer_ref,
 733                                                 ref->remote_status, porcelain);
 734                break;
 735        case REF_STATUS_EXPECTING_REPORT:
 736                print_ref_status('!', "[remote failure]", ref,
 737                                                 ref->deletion ? NULL : ref->peer_ref,
 738                                                 "remote failed to report status", porcelain);
 739                break;
 740        case REF_STATUS_OK:
 741                print_ok_ref_status(ref, porcelain);
 742                break;
 743        }
 744
 745        return 1;
 746}
 747
 748void transport_print_push_status(const char *dest, struct ref *refs,
 749                                  int verbose, int porcelain, unsigned int *reject_reasons)
 750{
 751        struct ref *ref;
 752        int n = 0;
 753        unsigned char head_sha1[20];
 754        char *head;
 755
 756        head = resolve_refdup("HEAD", head_sha1, 1, NULL);
 757
 758        if (verbose) {
 759                for (ref = refs; ref; ref = ref->next)
 760                        if (ref->status == REF_STATUS_UPTODATE)
 761                                n += print_one_push_status(ref, dest, n, porcelain);
 762        }
 763
 764        for (ref = refs; ref; ref = ref->next)
 765                if (ref->status == REF_STATUS_OK)
 766                        n += print_one_push_status(ref, dest, n, porcelain);
 767
 768        *reject_reasons = 0;
 769        for (ref = refs; ref; ref = ref->next) {
 770                if (ref->status != REF_STATUS_NONE &&
 771                    ref->status != REF_STATUS_UPTODATE &&
 772                    ref->status != REF_STATUS_OK)
 773                        n += print_one_push_status(ref, dest, n, porcelain);
 774                if (ref->status == REF_STATUS_REJECT_NONFASTFORWARD) {
 775                        if (head != NULL && !strcmp(head, ref->name))
 776                                *reject_reasons |= REJECT_NON_FF_HEAD;
 777                        else
 778                                *reject_reasons |= REJECT_NON_FF_OTHER;
 779                } else if (ref->status == REF_STATUS_REJECT_ALREADY_EXISTS) {
 780                        *reject_reasons |= REJECT_ALREADY_EXISTS;
 781                } else if (ref->status == REF_STATUS_REJECT_FETCH_FIRST) {
 782                        *reject_reasons |= REJECT_FETCH_FIRST;
 783                } else if (ref->status == REF_STATUS_REJECT_NEEDS_FORCE) {
 784                        *reject_reasons |= REJECT_NEEDS_FORCE;
 785                }
 786        }
 787}
 788
 789void transport_verify_remote_names(int nr_heads, const char **heads)
 790{
 791        int i;
 792
 793        for (i = 0; i < nr_heads; i++) {
 794                const char *local = heads[i];
 795                const char *remote = strrchr(heads[i], ':');
 796
 797                if (*local == '+')
 798                        local++;
 799
 800                /* A matching refspec is okay.  */
 801                if (remote == local && remote[1] == '\0')
 802                        continue;
 803
 804                remote = remote ? (remote + 1) : local;
 805                if (check_refname_format(remote,
 806                                REFNAME_ALLOW_ONELEVEL|REFNAME_REFSPEC_PATTERN))
 807                        die("remote part of refspec is not a valid name in %s",
 808                                heads[i]);
 809        }
 810}
 811
 812static int git_transport_push(struct transport *transport, struct ref *remote_refs, int flags)
 813{
 814        struct git_transport_data *data = transport->data;
 815        struct send_pack_args args;
 816        int ret;
 817
 818        if (!data->got_remote_heads) {
 819                struct ref *tmp_refs;
 820                connect_setup(transport, 1, 0);
 821
 822                get_remote_heads(data->fd[0], NULL, 0, &tmp_refs, REF_NORMAL,
 823                                 NULL, &data->shallow);
 824                data->got_remote_heads = 1;
 825        }
 826
 827        memset(&args, 0, sizeof(args));
 828        args.send_mirror = !!(flags & TRANSPORT_PUSH_MIRROR);
 829        args.force_update = !!(flags & TRANSPORT_PUSH_FORCE);
 830        args.use_thin_pack = data->options.thin;
 831        args.verbose = (transport->verbose > 0);
 832        args.quiet = (transport->verbose < 0);
 833        args.progress = transport->progress;
 834        args.dry_run = !!(flags & TRANSPORT_PUSH_DRY_RUN);
 835        args.porcelain = !!(flags & TRANSPORT_PUSH_PORCELAIN);
 836
 837        ret = send_pack(&args, data->fd, data->conn, remote_refs,
 838                        &data->extra_have);
 839
 840        close(data->fd[1]);
 841        close(data->fd[0]);
 842        ret |= finish_connect(data->conn);
 843        data->conn = NULL;
 844        data->got_remote_heads = 0;
 845
 846        return ret;
 847}
 848
 849static int connect_git(struct transport *transport, const char *name,
 850                       const char *executable, int fd[2])
 851{
 852        struct git_transport_data *data = transport->data;
 853        data->conn = git_connect(data->fd, transport->url,
 854                                 executable, 0);
 855        fd[0] = data->fd[0];
 856        fd[1] = data->fd[1];
 857        return 0;
 858}
 859
 860static int disconnect_git(struct transport *transport)
 861{
 862        struct git_transport_data *data = transport->data;
 863        if (data->conn) {
 864                if (data->got_remote_heads)
 865                        packet_flush(data->fd[1]);
 866                close(data->fd[0]);
 867                close(data->fd[1]);
 868                finish_connect(data->conn);
 869        }
 870
 871        free(data);
 872        return 0;
 873}
 874
 875void transport_take_over(struct transport *transport,
 876                         struct child_process *child)
 877{
 878        struct git_transport_data *data;
 879
 880        if (!transport->smart_options)
 881                die("Bug detected: Taking over transport requires non-NULL "
 882                    "smart_options field.");
 883
 884        data = xcalloc(1, sizeof(*data));
 885        data->options = *transport->smart_options;
 886        data->conn = child;
 887        data->fd[0] = data->conn->out;
 888        data->fd[1] = data->conn->in;
 889        data->got_remote_heads = 0;
 890        transport->data = data;
 891
 892        transport->set_option = NULL;
 893        transport->get_refs_list = get_refs_via_connect;
 894        transport->fetch = fetch_refs_via_pack;
 895        transport->push = NULL;
 896        transport->push_refs = git_transport_push;
 897        transport->disconnect = disconnect_git;
 898        transport->smart_options = &(data->options);
 899
 900        transport->cannot_reuse = 1;
 901}
 902
 903static int is_file(const char *url)
 904{
 905        struct stat buf;
 906        if (stat(url, &buf))
 907                return 0;
 908        return S_ISREG(buf.st_mode);
 909}
 910
 911static int external_specification_len(const char *url)
 912{
 913        return strchr(url, ':') - url;
 914}
 915
 916struct transport *transport_get(struct remote *remote, const char *url)
 917{
 918        const char *helper;
 919        struct transport *ret = xcalloc(1, sizeof(*ret));
 920
 921        ret->progress = isatty(2);
 922
 923        if (!remote)
 924                die("No remote provided to transport_get()");
 925
 926        ret->got_remote_refs = 0;
 927        ret->remote = remote;
 928        helper = remote->foreign_vcs;
 929
 930        if (!url && remote->url)
 931                url = remote->url[0];
 932        ret->url = url;
 933
 934        /* maybe it is a foreign URL? */
 935        if (url) {
 936                const char *p = url;
 937
 938                while (is_urlschemechar(p == url, *p))
 939                        p++;
 940                if (starts_with(p, "::"))
 941                        helper = xstrndup(url, p - url);
 942        }
 943
 944        if (helper) {
 945                transport_helper_init(ret, helper);
 946        } else if (starts_with(url, "rsync:")) {
 947                ret->get_refs_list = get_refs_via_rsync;
 948                ret->fetch = fetch_objs_via_rsync;
 949                ret->push = rsync_transport_push;
 950                ret->smart_options = NULL;
 951        } else if (url_is_local_not_ssh(url) && is_file(url) && is_bundle(url, 1)) {
 952                struct bundle_transport_data *data = xcalloc(1, sizeof(*data));
 953                ret->data = data;
 954                ret->get_refs_list = get_refs_from_bundle;
 955                ret->fetch = fetch_refs_from_bundle;
 956                ret->disconnect = close_bundle;
 957                ret->smart_options = NULL;
 958        } else if (!is_url(url)
 959                || starts_with(url, "file://")
 960                || starts_with(url, "git://")
 961                || starts_with(url, "ssh://")
 962                || starts_with(url, "git+ssh://")
 963                || starts_with(url, "ssh+git://")) {
 964                /* These are builtin smart transports. */
 965                struct git_transport_data *data = xcalloc(1, sizeof(*data));
 966                ret->data = data;
 967                ret->set_option = NULL;
 968                ret->get_refs_list = get_refs_via_connect;
 969                ret->fetch = fetch_refs_via_pack;
 970                ret->push_refs = git_transport_push;
 971                ret->connect = connect_git;
 972                ret->disconnect = disconnect_git;
 973                ret->smart_options = &(data->options);
 974
 975                data->conn = NULL;
 976                data->got_remote_heads = 0;
 977        } else {
 978                /* Unknown protocol in URL. Pass to external handler. */
 979                int len = external_specification_len(url);
 980                char *handler = xmalloc(len + 1);
 981                handler[len] = 0;
 982                strncpy(handler, url, len);
 983                transport_helper_init(ret, handler);
 984        }
 985
 986        if (ret->smart_options) {
 987                ret->smart_options->thin = 1;
 988                ret->smart_options->uploadpack = "git-upload-pack";
 989                if (remote->uploadpack)
 990                        ret->smart_options->uploadpack = remote->uploadpack;
 991                ret->smart_options->receivepack = "git-receive-pack";
 992                if (remote->receivepack)
 993                        ret->smart_options->receivepack = remote->receivepack;
 994        }
 995
 996        return ret;
 997}
 998
 999int transport_set_option(struct transport *transport,
1000                         const char *name, const char *value)
1001{
1002        int git_reports = 1, protocol_reports = 1;
1003
1004        if (transport->smart_options)
1005                git_reports = set_git_option(transport->smart_options,
1006                                             name, value);
1007
1008        if (transport->set_option)
1009                protocol_reports = transport->set_option(transport, name,
1010                                                        value);
1011
1012        /* If either report is 0, report 0 (success). */
1013        if (!git_reports || !protocol_reports)
1014                return 0;
1015        /* If either reports -1 (invalid value), report -1. */
1016        if ((git_reports == -1) || (protocol_reports == -1))
1017                return -1;
1018        /* Otherwise if both report unknown, report unknown. */
1019        return 1;
1020}
1021
1022void transport_set_verbosity(struct transport *transport, int verbosity,
1023        int force_progress)
1024{
1025        if (verbosity >= 1)
1026                transport->verbose = verbosity <= 3 ? verbosity : 3;
1027        if (verbosity < 0)
1028                transport->verbose = -1;
1029
1030        /**
1031         * Rules used to determine whether to report progress (processing aborts
1032         * when a rule is satisfied):
1033         *
1034         *   . Report progress, if force_progress is 1 (ie. --progress).
1035         *   . Don't report progress, if force_progress is 0 (ie. --no-progress).
1036         *   . Don't report progress, if verbosity < 0 (ie. -q/--quiet ).
1037         *   . Report progress if isatty(2) is 1.
1038         **/
1039        if (force_progress >= 0)
1040                transport->progress = !!force_progress;
1041        else
1042                transport->progress = verbosity >= 0 && isatty(2);
1043}
1044
1045static void die_with_unpushed_submodules(struct string_list *needs_pushing)
1046{
1047        int i;
1048
1049        fprintf(stderr, "The following submodule paths contain changes that can\n"
1050                        "not be found on any remote:\n");
1051        for (i = 0; i < needs_pushing->nr; i++)
1052                printf("  %s\n", needs_pushing->items[i].string);
1053        fprintf(stderr, "\nPlease try\n\n"
1054                        "       git push --recurse-submodules=on-demand\n\n"
1055                        "or cd to the path and use\n\n"
1056                        "       git push\n\n"
1057                        "to push them to a remote.\n\n");
1058
1059        string_list_clear(needs_pushing, 0);
1060
1061        die("Aborting.");
1062}
1063
1064static int run_pre_push_hook(struct transport *transport,
1065                             struct ref *remote_refs)
1066{
1067        int ret = 0, x;
1068        struct ref *r;
1069        struct child_process proc;
1070        struct strbuf buf;
1071        const char *argv[4];
1072
1073        if (!(argv[0] = find_hook("pre-push")))
1074                return 0;
1075
1076        argv[1] = transport->remote->name;
1077        argv[2] = transport->url;
1078        argv[3] = NULL;
1079
1080        memset(&proc, 0, sizeof(proc));
1081        proc.argv = argv;
1082        proc.in = -1;
1083
1084        if (start_command(&proc)) {
1085                finish_command(&proc);
1086                return -1;
1087        }
1088
1089        strbuf_init(&buf, 256);
1090
1091        for (r = remote_refs; r; r = r->next) {
1092                if (!r->peer_ref) continue;
1093                if (r->status == REF_STATUS_REJECT_NONFASTFORWARD) continue;
1094                if (r->status == REF_STATUS_REJECT_STALE) continue;
1095                if (r->status == REF_STATUS_UPTODATE) continue;
1096
1097                strbuf_reset(&buf);
1098                strbuf_addf( &buf, "%s %s %s %s\n",
1099                         r->peer_ref->name, sha1_to_hex(r->new_sha1),
1100                         r->name, sha1_to_hex(r->old_sha1));
1101
1102                if (write_in_full(proc.in, buf.buf, buf.len) != buf.len) {
1103                        ret = -1;
1104                        break;
1105                }
1106        }
1107
1108        strbuf_release(&buf);
1109
1110        x = close(proc.in);
1111        if (!ret)
1112                ret = x;
1113
1114        x = finish_command(&proc);
1115        if (!ret)
1116                ret = x;
1117
1118        return ret;
1119}
1120
1121int transport_push(struct transport *transport,
1122                   int refspec_nr, const char **refspec, int flags,
1123                   unsigned int *reject_reasons)
1124{
1125        *reject_reasons = 0;
1126        transport_verify_remote_names(refspec_nr, refspec);
1127
1128        if (transport->push) {
1129                /* Maybe FIXME. But no important transport uses this case. */
1130                if (flags & TRANSPORT_PUSH_SET_UPSTREAM)
1131                        die("This transport does not support using --set-upstream");
1132
1133                return transport->push(transport, refspec_nr, refspec, flags);
1134        } else if (transport->push_refs) {
1135                struct ref *remote_refs =
1136                        transport->get_refs_list(transport, 1);
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 (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;
1186
1187                        memset(&needs_pushing, 0, sizeof(struct string_list));
1188                        needs_pushing.strdup_strings = 1;
1189                        for (; ref; ref = ref->next)
1190                                if (!is_null_sha1(ref->new_sha1) &&
1191                                    find_unpushed_submodules(ref->new_sha1,
1192                                            transport->remote->name, &needs_pushing))
1193                                        die_with_unpushed_submodules(&needs_pushing);
1194                }
1195
1196                push_ret = transport->push_refs(transport, remote_refs, flags);
1197                err = push_had_errors(remote_refs);
1198                ret = push_ret | err;
1199
1200                if (!quiet || err)
1201                        transport_print_push_status(transport->url, remote_refs,
1202                                        verbose | porcelain, porcelain,
1203                                        reject_reasons);
1204
1205                if (flags & TRANSPORT_PUSH_SET_UPSTREAM)
1206                        set_upstreams(transport, remote_refs, pretend);
1207
1208                if (!(flags & TRANSPORT_PUSH_DRY_RUN)) {
1209                        struct ref *ref;
1210                        for (ref = remote_refs; ref; ref = ref->next)
1211                                transport_update_tracking_ref(transport->remote, ref, verbose);
1212                }
1213
1214                if (porcelain && !push_ret)
1215                        puts("Done");
1216                else if (!quiet && !ret && !transport_refs_pushed(remote_refs))
1217                        fprintf(stderr, "Everything up-to-date\n");
1218
1219                return ret;
1220        }
1221        return 1;
1222}
1223
1224const struct ref *transport_get_remote_refs(struct transport *transport)
1225{
1226        if (!transport->got_remote_refs) {
1227                transport->remote_refs = transport->get_refs_list(transport, 0);
1228                transport->got_remote_refs = 1;
1229        }
1230
1231        return transport->remote_refs;
1232}
1233
1234int transport_fetch_refs(struct transport *transport, struct ref *refs)
1235{
1236        int rc;
1237        int nr_heads = 0, nr_alloc = 0, nr_refs = 0;
1238        struct ref **heads = NULL;
1239        struct ref *rm;
1240
1241        for (rm = refs; rm; rm = rm->next) {
1242                nr_refs++;
1243                if (rm->peer_ref &&
1244                    !is_null_sha1(rm->old_sha1) &&
1245                    !hashcmp(rm->peer_ref->old_sha1, rm->old_sha1))
1246                        continue;
1247                ALLOC_GROW(heads, nr_heads + 1, nr_alloc);
1248                heads[nr_heads++] = rm;
1249        }
1250
1251        if (!nr_heads) {
1252                /*
1253                 * When deepening of a shallow repository is requested,
1254                 * then local and remote refs are likely to still be equal.
1255                 * Just feed them all to the fetch method in that case.
1256                 * This condition shouldn't be met in a non-deepening fetch
1257                 * (see builtin/fetch.c:quickfetch()).
1258                 */
1259                heads = xmalloc(nr_refs * sizeof(*heads));
1260                for (rm = refs; rm; rm = rm->next)
1261                        heads[nr_heads++] = rm;
1262        }
1263
1264        rc = transport->fetch(transport, nr_heads, heads);
1265
1266        free(heads);
1267        return rc;
1268}
1269
1270void transport_unlock_pack(struct transport *transport)
1271{
1272        if (transport->pack_lockfile) {
1273                unlink_or_warn(transport->pack_lockfile);
1274                free(transport->pack_lockfile);
1275                transport->pack_lockfile = NULL;
1276        }
1277}
1278
1279int transport_connect(struct transport *transport, const char *name,
1280                      const char *exec, int fd[2])
1281{
1282        if (transport->connect)
1283                return transport->connect(transport, name, exec, fd);
1284        else
1285                die("Operation not supported by protocol");
1286}
1287
1288int transport_disconnect(struct transport *transport)
1289{
1290        int ret = 0;
1291        if (transport->disconnect)
1292                ret = transport->disconnect(transport);
1293        free(transport);
1294        return ret;
1295}
1296
1297/*
1298 * Strip username (and password) from a URL and return
1299 * it in a newly allocated string.
1300 */
1301char *transport_anonymize_url(const char *url)
1302{
1303        char *anon_url, *scheme_prefix, *anon_part;
1304        size_t anon_len, prefix_len = 0;
1305
1306        anon_part = strchr(url, '@');
1307        if (url_is_local_not_ssh(url) || !anon_part)
1308                goto literal_copy;
1309
1310        anon_len = strlen(++anon_part);
1311        scheme_prefix = strstr(url, "://");
1312        if (!scheme_prefix) {
1313                if (!strchr(anon_part, ':'))
1314                        /* cannot be "me@there:/path/name" */
1315                        goto literal_copy;
1316        } else {
1317                const char *cp;
1318                /* make sure scheme is reasonable */
1319                for (cp = url; cp < scheme_prefix; cp++) {
1320                        switch (*cp) {
1321                                /* RFC 1738 2.1 */
1322                        case '+': case '.': case '-':
1323                                break; /* ok */
1324                        default:
1325                                if (isalnum(*cp))
1326                                        break;
1327                                /* it isn't */
1328                                goto literal_copy;
1329                        }
1330                }
1331                /* @ past the first slash does not count */
1332                cp = strchr(scheme_prefix + 3, '/');
1333                if (cp && cp < anon_part)
1334                        goto literal_copy;
1335                prefix_len = scheme_prefix - url + 3;
1336        }
1337        anon_url = xcalloc(1, 1 + prefix_len + anon_len);
1338        memcpy(anon_url, url, prefix_len);
1339        memcpy(anon_url + prefix_len, anon_part, anon_len);
1340        return anon_url;
1341literal_copy:
1342        return xstrdup(url);
1343}
1344
1345struct alternate_refs_data {
1346        alternate_ref_fn *fn;
1347        void *data;
1348};
1349
1350static int refs_from_alternate_cb(struct alternate_object_database *e,
1351                                  void *data)
1352{
1353        char *other;
1354        size_t len;
1355        struct remote *remote;
1356        struct transport *transport;
1357        const struct ref *extra;
1358        struct alternate_refs_data *cb = data;
1359
1360        e->name[-1] = '\0';
1361        other = xstrdup(real_path(e->base));
1362        e->name[-1] = '/';
1363        len = strlen(other);
1364
1365        while (other[len-1] == '/')
1366                other[--len] = '\0';
1367        if (len < 8 || memcmp(other + len - 8, "/objects", 8))
1368                return 0;
1369        /* Is this a git repository with refs? */
1370        memcpy(other + len - 8, "/refs", 6);
1371        if (!is_directory(other))
1372                return 0;
1373        other[len - 8] = '\0';
1374        remote = remote_get(other);
1375        transport = transport_get(remote, other);
1376        for (extra = transport_get_remote_refs(transport);
1377             extra;
1378             extra = extra->next)
1379                cb->fn(extra, cb->data);
1380        transport_disconnect(transport);
1381        free(other);
1382        return 0;
1383}
1384
1385void for_each_alternate_ref(alternate_ref_fn fn, void *data)
1386{
1387        struct alternate_refs_data cb;
1388        cb.fn = fn;
1389        cb.data = data;
1390        foreach_alt_odb(refs_from_alternate_cb, &cb);
1391}