Andrew's git / gitweb.git / transport.c
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transport.con commit Merge branch 'maint' of git://github.com/git-l10n/git-po into maint (c90d3db)
   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
  18/* rsync support */
  19
  20/*
  21 * We copy packed-refs and refs/ into a temporary file, then read the
  22 * loose refs recursively (sorting whenever possible), and then inserting
  23 * those packed refs that are not yet in the list (not validating, but
  24 * assuming that the file is sorted).
  25 *
  26 * Appears refactoring this from refs.c is too cumbersome.
  27 */
  28
  29static int str_cmp(const void *a, const void *b)
  30{
  31        const char *s1 = a;
  32        const char *s2 = b;
  33
  34        return strcmp(s1, s2);
  35}
  36
  37/* path->buf + name_offset is expected to point to "refs/" */
  38
  39static int read_loose_refs(struct strbuf *path, int name_offset,
  40                struct ref **tail)
  41{
  42        DIR *dir = opendir(path->buf);
  43        struct dirent *de;
  44        struct {
  45                char **entries;
  46                int nr, alloc;
  47        } list;
  48        int i, pathlen;
  49
  50        if (!dir)
  51                return -1;
  52
  53        memset (&list, 0, sizeof(list));
  54
  55        while ((de = readdir(dir))) {
  56                if (is_dot_or_dotdot(de->d_name))
  57                        continue;
  58                ALLOC_GROW(list.entries, list.nr + 1, list.alloc);
  59                list.entries[list.nr++] = xstrdup(de->d_name);
  60        }
  61        closedir(dir);
  62
  63        /* sort the list */
  64
  65        qsort(list.entries, list.nr, sizeof(char *), str_cmp);
  66
  67        pathlen = path->len;
  68        strbuf_addch(path, '/');
  69
  70        for (i = 0; i < list.nr; i++, strbuf_setlen(path, pathlen + 1)) {
  71                strbuf_addstr(path, list.entries[i]);
  72                if (read_loose_refs(path, name_offset, tail)) {
  73                        int fd = open(path->buf, O_RDONLY);
  74                        char buffer[40];
  75                        struct ref *next;
  76
  77                        if (fd < 0)
  78                                continue;
  79                        next = alloc_ref(path->buf + name_offset);
  80                        if (read_in_full(fd, buffer, 40) != 40 ||
  81                                        get_sha1_hex(buffer, next->old_sha1)) {
  82                                close(fd);
  83                                free(next);
  84                                continue;
  85                        }
  86                        close(fd);
  87                        (*tail)->next = next;
  88                        *tail = next;
  89                }
  90        }
  91        strbuf_setlen(path, pathlen);
  92
  93        for (i = 0; i < list.nr; i++)
  94                free(list.entries[i]);
  95        free(list.entries);
  96
  97        return 0;
  98}
  99
 100/* insert the packed refs for which no loose refs were found */
 101
 102static void insert_packed_refs(const char *packed_refs, struct ref **list)
 103{
 104        FILE *f = fopen(packed_refs, "r");
 105        static char buffer[PATH_MAX];
 106
 107        if (!f)
 108                return;
 109
 110        for (;;) {
 111                int cmp = 0; /* assigned before used */
 112                int len;
 113
 114                if (!fgets(buffer, sizeof(buffer), f)) {
 115                        fclose(f);
 116                        return;
 117                }
 118
 119                if (hexval(buffer[0]) > 0xf)
 120                        continue;
 121                len = strlen(buffer);
 122                if (len && buffer[len - 1] == '\n')
 123                        buffer[--len] = '\0';
 124                if (len < 41)
 125                        continue;
 126                while ((*list)->next &&
 127                                (cmp = strcmp(buffer + 41,
 128                                      (*list)->next->name)) > 0)
 129                        list = &(*list)->next;
 130                if (!(*list)->next || cmp < 0) {
 131                        struct ref *next = alloc_ref(buffer + 41);
 132                        buffer[40] = '\0';
 133                        if (get_sha1_hex(buffer, next->old_sha1)) {
 134                                warning ("invalid SHA-1: %s", buffer);
 135                                free(next);
 136                                continue;
 137                        }
 138                        next->next = (*list)->next;
 139                        (*list)->next = next;
 140                        list = &(*list)->next;
 141                }
 142        }
 143}
 144
 145static void set_upstreams(struct transport *transport, struct ref *refs,
 146        int pretend)
 147{
 148        struct ref *ref;
 149        for (ref = refs; ref; ref = ref->next) {
 150                const char *localname;
 151                const char *tmp;
 152                const char *remotename;
 153                unsigned char sha[20];
 154                int flag = 0;
 155                /*
 156                 * Check suitability for tracking. Must be successful /
 157                 * already up-to-date ref create/modify (not delete).
 158                 */
 159                if (ref->status != REF_STATUS_OK &&
 160                        ref->status != REF_STATUS_UPTODATE)
 161                        continue;
 162                if (!ref->peer_ref)
 163                        continue;
 164                if (is_null_sha1(ref->new_sha1))
 165                        continue;
 166
 167                /* Follow symbolic refs (mainly for HEAD). */
 168                localname = ref->peer_ref->name;
 169                remotename = ref->name;
 170                tmp = resolve_ref_unsafe(localname, sha, 1, &flag);
 171                if (tmp && flag & REF_ISSYMREF &&
 172                        !prefixcmp(tmp, "refs/heads/"))
 173                        localname = tmp;
 174
 175                /* Both source and destination must be local branches. */
 176                if (!localname || prefixcmp(localname, "refs/heads/"))
 177                        continue;
 178                if (!remotename || prefixcmp(remotename, "refs/heads/"))
 179                        continue;
 180
 181                if (!pretend)
 182                        install_branch_config(BRANCH_CONFIG_VERBOSE,
 183                                localname + 11, transport->remote->name,
 184                                remotename);
 185                else
 186                        printf("Would set upstream of '%s' to '%s' of '%s'\n",
 187                                localname + 11, remotename + 11,
 188                                transport->remote->name);
 189        }
 190}
 191
 192static const char *rsync_url(const char *url)
 193{
 194        return prefixcmp(url, "rsync://") ? skip_prefix(url, "rsync:") : url;
 195}
 196
 197static struct ref *get_refs_via_rsync(struct transport *transport, int for_push)
 198{
 199        struct strbuf buf = STRBUF_INIT, temp_dir = STRBUF_INIT;
 200        struct ref dummy = {NULL}, *tail = &dummy;
 201        struct child_process rsync;
 202        const char *args[5];
 203        int temp_dir_len;
 204
 205        if (for_push)
 206                return NULL;
 207
 208        /* copy the refs to the temporary directory */
 209
 210        strbuf_addstr(&temp_dir, git_path("rsync-refs-XXXXXX"));
 211        if (!mkdtemp(temp_dir.buf))
 212                die_errno ("Could not make temporary directory");
 213        temp_dir_len = temp_dir.len;
 214
 215        strbuf_addstr(&buf, rsync_url(transport->url));
 216        strbuf_addstr(&buf, "/refs");
 217
 218        memset(&rsync, 0, sizeof(rsync));
 219        rsync.argv = args;
 220        rsync.stdout_to_stderr = 1;
 221        args[0] = "rsync";
 222        args[1] = (transport->verbose > 1) ? "-rv" : "-r";
 223        args[2] = buf.buf;
 224        args[3] = temp_dir.buf;
 225        args[4] = NULL;
 226
 227        if (run_command(&rsync))
 228                die ("Could not run rsync to get refs");
 229
 230        strbuf_reset(&buf);
 231        strbuf_addstr(&buf, rsync_url(transport->url));
 232        strbuf_addstr(&buf, "/packed-refs");
 233
 234        args[2] = buf.buf;
 235
 236        if (run_command(&rsync))
 237                die ("Could not run rsync to get refs");
 238
 239        /* read the copied refs */
 240
 241        strbuf_addstr(&temp_dir, "/refs");
 242        read_loose_refs(&temp_dir, temp_dir_len + 1, &tail);
 243        strbuf_setlen(&temp_dir, temp_dir_len);
 244
 245        tail = &dummy;
 246        strbuf_addstr(&temp_dir, "/packed-refs");
 247        insert_packed_refs(temp_dir.buf, &tail);
 248        strbuf_setlen(&temp_dir, temp_dir_len);
 249
 250        if (remove_dir_recursively(&temp_dir, 0))
 251                warning ("Error removing temporary directory %s.",
 252                                temp_dir.buf);
 253
 254        strbuf_release(&buf);
 255        strbuf_release(&temp_dir);
 256
 257        return dummy.next;
 258}
 259
 260static int fetch_objs_via_rsync(struct transport *transport,
 261                                int nr_objs, struct ref **to_fetch)
 262{
 263        struct strbuf buf = STRBUF_INIT;
 264        struct child_process rsync;
 265        const char *args[8];
 266        int result;
 267
 268        strbuf_addstr(&buf, rsync_url(transport->url));
 269        strbuf_addstr(&buf, "/objects/");
 270
 271        memset(&rsync, 0, sizeof(rsync));
 272        rsync.argv = args;
 273        rsync.stdout_to_stderr = 1;
 274        args[0] = "rsync";
 275        args[1] = (transport->verbose > 1) ? "-rv" : "-r";
 276        args[2] = "--ignore-existing";
 277        args[3] = "--exclude";
 278        args[4] = "info";
 279        args[5] = buf.buf;
 280        args[6] = get_object_directory();
 281        args[7] = NULL;
 282
 283        /* NEEDSWORK: handle one level of alternates */
 284        result = run_command(&rsync);
 285
 286        strbuf_release(&buf);
 287
 288        return result;
 289}
 290
 291static int write_one_ref(const char *name, const unsigned char *sha1,
 292                int flags, void *data)
 293{
 294        struct strbuf *buf = data;
 295        int len = buf->len;
 296        FILE *f;
 297
 298        /* when called via for_each_ref(), flags is non-zero */
 299        if (flags && prefixcmp(name, "refs/heads/") &&
 300                        prefixcmp(name, "refs/tags/"))
 301                return 0;
 302
 303        strbuf_addstr(buf, name);
 304        if (safe_create_leading_directories(buf->buf) ||
 305                        !(f = fopen(buf->buf, "w")) ||
 306                        fprintf(f, "%s\n", sha1_to_hex(sha1)) < 0 ||
 307                        fclose(f))
 308                return error("problems writing temporary file %s", buf->buf);
 309        strbuf_setlen(buf, len);
 310        return 0;
 311}
 312
 313static int write_refs_to_temp_dir(struct strbuf *temp_dir,
 314                int refspec_nr, const char **refspec)
 315{
 316        int i;
 317
 318        for (i = 0; i < refspec_nr; i++) {
 319                unsigned char sha1[20];
 320                char *ref;
 321
 322                if (dwim_ref(refspec[i], strlen(refspec[i]), sha1, &ref) != 1)
 323                        return error("Could not get ref %s", refspec[i]);
 324
 325                if (write_one_ref(ref, sha1, 0, temp_dir)) {
 326                        free(ref);
 327                        return -1;
 328                }
 329                free(ref);
 330        }
 331        return 0;
 332}
 333
 334static int rsync_transport_push(struct transport *transport,
 335                int refspec_nr, const char **refspec, int flags)
 336{
 337        struct strbuf buf = STRBUF_INIT, temp_dir = STRBUF_INIT;
 338        int result = 0, i;
 339        struct child_process rsync;
 340        const char *args[10];
 341
 342        if (flags & TRANSPORT_PUSH_MIRROR)
 343                return error("rsync transport does not support mirror mode");
 344
 345        /* first push the objects */
 346
 347        strbuf_addstr(&buf, rsync_url(transport->url));
 348        strbuf_addch(&buf, '/');
 349
 350        memset(&rsync, 0, sizeof(rsync));
 351        rsync.argv = args;
 352        rsync.stdout_to_stderr = 1;
 353        i = 0;
 354        args[i++] = "rsync";
 355        args[i++] = "-a";
 356        if (flags & TRANSPORT_PUSH_DRY_RUN)
 357                args[i++] = "--dry-run";
 358        if (transport->verbose > 1)
 359                args[i++] = "-v";
 360        args[i++] = "--ignore-existing";
 361        args[i++] = "--exclude";
 362        args[i++] = "info";
 363        args[i++] = get_object_directory();
 364        args[i++] = buf.buf;
 365        args[i++] = NULL;
 366
 367        if (run_command(&rsync))
 368                return error("Could not push objects to %s",
 369                                rsync_url(transport->url));
 370
 371        /* copy the refs to the temporary directory; they could be packed. */
 372
 373        strbuf_addstr(&temp_dir, git_path("rsync-refs-XXXXXX"));
 374        if (!mkdtemp(temp_dir.buf))
 375                die_errno ("Could not make temporary directory");
 376        strbuf_addch(&temp_dir, '/');
 377
 378        if (flags & TRANSPORT_PUSH_ALL) {
 379                if (for_each_ref(write_one_ref, &temp_dir))
 380                        return -1;
 381        } else if (write_refs_to_temp_dir(&temp_dir, refspec_nr, refspec))
 382                return -1;
 383
 384        i = 2;
 385        if (flags & TRANSPORT_PUSH_DRY_RUN)
 386                args[i++] = "--dry-run";
 387        if (!(flags & TRANSPORT_PUSH_FORCE))
 388                args[i++] = "--ignore-existing";
 389        args[i++] = temp_dir.buf;
 390        args[i++] = rsync_url(transport->url);
 391        args[i++] = NULL;
 392        if (run_command(&rsync))
 393                result = error("Could not push to %s",
 394                                rsync_url(transport->url));
 395
 396        if (remove_dir_recursively(&temp_dir, 0))
 397                warning ("Could not remove temporary directory %s.",
 398                                temp_dir.buf);
 399
 400        strbuf_release(&buf);
 401        strbuf_release(&temp_dir);
 402
 403        return result;
 404}
 405
 406struct bundle_transport_data {
 407        int fd;
 408        struct bundle_header header;
 409};
 410
 411static struct ref *get_refs_from_bundle(struct transport *transport, int for_push)
 412{
 413        struct bundle_transport_data *data = transport->data;
 414        struct ref *result = NULL;
 415        int i;
 416
 417        if (for_push)
 418                return NULL;
 419
 420        if (data->fd > 0)
 421                close(data->fd);
 422        data->fd = read_bundle_header(transport->url, &data->header);
 423        if (data->fd < 0)
 424                die ("Could not read bundle '%s'.", transport->url);
 425        for (i = 0; i < data->header.references.nr; i++) {
 426                struct ref_list_entry *e = data->header.references.list + i;
 427                struct ref *ref = alloc_ref(e->name);
 428                hashcpy(ref->old_sha1, e->sha1);
 429                ref->next = result;
 430                result = ref;
 431        }
 432        return result;
 433}
 434
 435static int fetch_refs_from_bundle(struct transport *transport,
 436                               int nr_heads, struct ref **to_fetch)
 437{
 438        struct bundle_transport_data *data = transport->data;
 439        return unbundle(&data->header, data->fd,
 440                        transport->progress ? BUNDLE_VERBOSE : 0);
 441}
 442
 443static int close_bundle(struct transport *transport)
 444{
 445        struct bundle_transport_data *data = transport->data;
 446        if (data->fd > 0)
 447                close(data->fd);
 448        free(data);
 449        return 0;
 450}
 451
 452struct git_transport_data {
 453        struct git_transport_options options;
 454        struct child_process *conn;
 455        int fd[2];
 456        unsigned got_remote_heads : 1;
 457        struct extra_have_objects extra_have;
 458};
 459
 460static int set_git_option(struct git_transport_options *opts,
 461                          const char *name, const char *value)
 462{
 463        if (!strcmp(name, TRANS_OPT_UPLOADPACK)) {
 464                opts->uploadpack = value;
 465                return 0;
 466        } else if (!strcmp(name, TRANS_OPT_RECEIVEPACK)) {
 467                opts->receivepack = value;
 468                return 0;
 469        } else if (!strcmp(name, TRANS_OPT_THIN)) {
 470                opts->thin = !!value;
 471                return 0;
 472        } else if (!strcmp(name, TRANS_OPT_FOLLOWTAGS)) {
 473                opts->followtags = !!value;
 474                return 0;
 475        } else if (!strcmp(name, TRANS_OPT_KEEP)) {
 476                opts->keep = !!value;
 477                return 0;
 478        } else if (!strcmp(name, TRANS_OPT_DEPTH)) {
 479                if (!value)
 480                        opts->depth = 0;
 481                else {
 482                        char *end;
 483                        opts->depth = strtol(value, &end, 0);
 484                        if (*end)
 485                                die("transport: invalid depth option '%s'", value);
 486                }
 487                return 0;
 488        }
 489        return 1;
 490}
 491
 492static int connect_setup(struct transport *transport, int for_push, int verbose)
 493{
 494        struct git_transport_data *data = transport->data;
 495
 496        if (data->conn)
 497                return 0;
 498
 499        data->conn = git_connect(data->fd, transport->url,
 500                                 for_push ? data->options.receivepack :
 501                                 data->options.uploadpack,
 502                                 verbose ? CONNECT_VERBOSE : 0);
 503
 504        return 0;
 505}
 506
 507static struct ref *get_refs_via_connect(struct transport *transport, int for_push)
 508{
 509        struct git_transport_data *data = transport->data;
 510        struct ref *refs;
 511
 512        connect_setup(transport, for_push, 0);
 513        get_remote_heads(data->fd[0], NULL, 0, &refs,
 514                         for_push ? REF_NORMAL : 0, &data->extra_have);
 515        data->got_remote_heads = 1;
 516
 517        return refs;
 518}
 519
 520static int fetch_refs_via_pack(struct transport *transport,
 521                               int nr_heads, struct ref **to_fetch)
 522{
 523        struct git_transport_data *data = transport->data;
 524        const struct ref *refs;
 525        char *dest = xstrdup(transport->url);
 526        struct fetch_pack_args args;
 527        struct ref *refs_tmp = NULL;
 528
 529        memset(&args, 0, sizeof(args));
 530        args.uploadpack = data->options.uploadpack;
 531        args.keep_pack = data->options.keep;
 532        args.lock_pack = 1;
 533        args.use_thin_pack = data->options.thin;
 534        args.include_tag = data->options.followtags;
 535        args.verbose = (transport->verbose > 1);
 536        args.quiet = (transport->verbose < 0);
 537        args.no_progress = !transport->progress;
 538        args.depth = data->options.depth;
 539        args.check_self_contained_and_connected =
 540                data->options.check_self_contained_and_connected;
 541
 542        if (!data->got_remote_heads) {
 543                connect_setup(transport, 0, 0);
 544                get_remote_heads(data->fd[0], NULL, 0, &refs_tmp, 0, NULL);
 545                data->got_remote_heads = 1;
 546        }
 547
 548        refs = fetch_pack(&args, data->fd, data->conn,
 549                          refs_tmp ? refs_tmp : transport->remote_refs,
 550                          dest, to_fetch, nr_heads,
 551                          &transport->pack_lockfile);
 552        close(data->fd[0]);
 553        close(data->fd[1]);
 554        if (finish_connect(data->conn))
 555                refs = NULL;
 556        data->conn = NULL;
 557        data->got_remote_heads = 0;
 558        data->options.self_contained_and_connected =
 559                args.self_contained_and_connected;
 560
 561        free_refs(refs_tmp);
 562
 563        free(dest);
 564        return (refs ? 0 : -1);
 565}
 566
 567static int push_had_errors(struct ref *ref)
 568{
 569        for (; ref; ref = ref->next) {
 570                switch (ref->status) {
 571                case REF_STATUS_NONE:
 572                case REF_STATUS_UPTODATE:
 573                case REF_STATUS_OK:
 574                        break;
 575                default:
 576                        return 1;
 577                }
 578        }
 579        return 0;
 580}
 581
 582int transport_refs_pushed(struct ref *ref)
 583{
 584        for (; ref; ref = ref->next) {
 585                switch(ref->status) {
 586                case REF_STATUS_NONE:
 587                case REF_STATUS_UPTODATE:
 588                        break;
 589                default:
 590                        return 1;
 591                }
 592        }
 593        return 0;
 594}
 595
 596void transport_update_tracking_ref(struct remote *remote, struct ref *ref, int verbose)
 597{
 598        struct refspec rs;
 599
 600        if (ref->status != REF_STATUS_OK && ref->status != REF_STATUS_UPTODATE)
 601                return;
 602
 603        rs.src = ref->name;
 604        rs.dst = NULL;
 605
 606        if (!remote_find_tracking(remote, &rs)) {
 607                if (verbose)
 608                        fprintf(stderr, "updating local tracking ref '%s'\n", rs.dst);
 609                if (ref->deletion) {
 610                        delete_ref(rs.dst, NULL, 0);
 611                } else
 612                        update_ref("update by push", rs.dst,
 613                                        ref->new_sha1, NULL, 0, 0);
 614                free(rs.dst);
 615        }
 616}
 617
 618static void print_ref_status(char flag, const char *summary, struct ref *to, struct ref *from, const char *msg, int porcelain)
 619{
 620        if (porcelain) {
 621                if (from)
 622                        fprintf(stdout, "%c\t%s:%s\t", flag, from->name, to->name);
 623                else
 624                        fprintf(stdout, "%c\t:%s\t", flag, to->name);
 625                if (msg)
 626                        fprintf(stdout, "%s (%s)\n", summary, msg);
 627                else
 628                        fprintf(stdout, "%s\n", summary);
 629        } else {
 630                fprintf(stderr, " %c %-*s ", flag, TRANSPORT_SUMMARY_WIDTH, summary);
 631                if (from)
 632                        fprintf(stderr, "%s -> %s", prettify_refname(from->name), prettify_refname(to->name));
 633                else
 634                        fputs(prettify_refname(to->name), stderr);
 635                if (msg) {
 636                        fputs(" (", stderr);
 637                        fputs(msg, stderr);
 638                        fputc(')', stderr);
 639                }
 640                fputc('\n', stderr);
 641        }
 642}
 643
 644static const char *status_abbrev(unsigned char sha1[20])
 645{
 646        return find_unique_abbrev(sha1, DEFAULT_ABBREV);
 647}
 648
 649static void print_ok_ref_status(struct ref *ref, int porcelain)
 650{
 651        if (ref->deletion)
 652                print_ref_status('-', "[deleted]", ref, NULL, NULL, porcelain);
 653        else if (is_null_sha1(ref->old_sha1))
 654                print_ref_status('*',
 655                        (!prefixcmp(ref->name, "refs/tags/") ? "[new tag]" :
 656                        "[new branch]"),
 657                        ref, ref->peer_ref, NULL, porcelain);
 658        else {
 659                char quickref[84];
 660                char type;
 661                const char *msg;
 662
 663                strcpy(quickref, status_abbrev(ref->old_sha1));
 664                if (ref->forced_update) {
 665                        strcat(quickref, "...");
 666                        type = '+';
 667                        msg = "forced update";
 668                } else {
 669                        strcat(quickref, "..");
 670                        type = ' ';
 671                        msg = NULL;
 672                }
 673                strcat(quickref, status_abbrev(ref->new_sha1));
 674
 675                print_ref_status(type, quickref, ref, ref->peer_ref, msg, porcelain);
 676        }
 677}
 678
 679static int print_one_push_status(struct ref *ref, const char *dest, int count, int porcelain)
 680{
 681        if (!count)
 682                fprintf(porcelain ? stdout : stderr, "To %s\n", dest);
 683
 684        switch(ref->status) {
 685        case REF_STATUS_NONE:
 686                print_ref_status('X', "[no match]", ref, NULL, NULL, porcelain);
 687                break;
 688        case REF_STATUS_REJECT_NODELETE:
 689                print_ref_status('!', "[rejected]", ref, NULL,
 690                                                 "remote does not support deleting refs", porcelain);
 691                break;
 692        case REF_STATUS_UPTODATE:
 693                print_ref_status('=', "[up to date]", ref,
 694                                                 ref->peer_ref, NULL, porcelain);
 695                break;
 696        case REF_STATUS_REJECT_NONFASTFORWARD:
 697                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 698                                                 "non-fast-forward", porcelain);
 699                break;
 700        case REF_STATUS_REJECT_ALREADY_EXISTS:
 701                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 702                                                 "already exists", porcelain);
 703                break;
 704        case REF_STATUS_REJECT_FETCH_FIRST:
 705                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 706                                                 "fetch first", porcelain);
 707                break;
 708        case REF_STATUS_REJECT_NEEDS_FORCE:
 709                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 710                                                 "needs force", porcelain);
 711                break;
 712        case REF_STATUS_REJECT_STALE:
 713                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 714                                                 "stale info", porcelain);
 715                break;
 716        case REF_STATUS_REMOTE_REJECT:
 717                print_ref_status('!', "[remote rejected]", ref,
 718                                                 ref->deletion ? NULL : ref->peer_ref,
 719                                                 ref->remote_status, porcelain);
 720                break;
 721        case REF_STATUS_EXPECTING_REPORT:
 722                print_ref_status('!', "[remote failure]", ref,
 723                                                 ref->deletion ? NULL : ref->peer_ref,
 724                                                 "remote failed to report status", porcelain);
 725                break;
 726        case REF_STATUS_OK:
 727                print_ok_ref_status(ref, porcelain);
 728                break;
 729        }
 730
 731        return 1;
 732}
 733
 734void transport_print_push_status(const char *dest, struct ref *refs,
 735                                  int verbose, int porcelain, unsigned int *reject_reasons)
 736{
 737        struct ref *ref;
 738        int n = 0;
 739        unsigned char head_sha1[20];
 740        char *head;
 741
 742        head = resolve_refdup("HEAD", head_sha1, 1, NULL);
 743
 744        if (verbose) {
 745                for (ref = refs; ref; ref = ref->next)
 746                        if (ref->status == REF_STATUS_UPTODATE)
 747                                n += print_one_push_status(ref, dest, n, porcelain);
 748        }
 749
 750        for (ref = refs; ref; ref = ref->next)
 751                if (ref->status == REF_STATUS_OK)
 752                        n += print_one_push_status(ref, dest, n, porcelain);
 753
 754        *reject_reasons = 0;
 755        for (ref = refs; ref; ref = ref->next) {
 756                if (ref->status != REF_STATUS_NONE &&
 757                    ref->status != REF_STATUS_UPTODATE &&
 758                    ref->status != REF_STATUS_OK)
 759                        n += print_one_push_status(ref, dest, n, porcelain);
 760                if (ref->status == REF_STATUS_REJECT_NONFASTFORWARD) {
 761                        if (head != NULL && !strcmp(head, ref->name))
 762                                *reject_reasons |= REJECT_NON_FF_HEAD;
 763                        else
 764                                *reject_reasons |= REJECT_NON_FF_OTHER;
 765                } else if (ref->status == REF_STATUS_REJECT_ALREADY_EXISTS) {
 766                        *reject_reasons |= REJECT_ALREADY_EXISTS;
 767                } else if (ref->status == REF_STATUS_REJECT_FETCH_FIRST) {
 768                        *reject_reasons |= REJECT_FETCH_FIRST;
 769                } else if (ref->status == REF_STATUS_REJECT_NEEDS_FORCE) {
 770                        *reject_reasons |= REJECT_NEEDS_FORCE;
 771                }
 772        }
 773}
 774
 775void transport_verify_remote_names(int nr_heads, const char **heads)
 776{
 777        int i;
 778
 779        for (i = 0; i < nr_heads; i++) {
 780                const char *local = heads[i];
 781                const char *remote = strrchr(heads[i], ':');
 782
 783                if (*local == '+')
 784                        local++;
 785
 786                /* A matching refspec is okay.  */
 787                if (remote == local && remote[1] == '\0')
 788                        continue;
 789
 790                remote = remote ? (remote + 1) : local;
 791                if (check_refname_format(remote,
 792                                REFNAME_ALLOW_ONELEVEL|REFNAME_REFSPEC_PATTERN))
 793                        die("remote part of refspec is not a valid name in %s",
 794                                heads[i]);
 795        }
 796}
 797
 798static int git_transport_push(struct transport *transport, struct ref *remote_refs, int flags)
 799{
 800        struct git_transport_data *data = transport->data;
 801        struct send_pack_args args;
 802        int ret;
 803
 804        if (!data->got_remote_heads) {
 805                struct ref *tmp_refs;
 806                connect_setup(transport, 1, 0);
 807
 808                get_remote_heads(data->fd[0], NULL, 0, &tmp_refs, REF_NORMAL, NULL);
 809                data->got_remote_heads = 1;
 810        }
 811
 812        memset(&args, 0, sizeof(args));
 813        args.send_mirror = !!(flags & TRANSPORT_PUSH_MIRROR);
 814        args.force_update = !!(flags & TRANSPORT_PUSH_FORCE);
 815        args.use_thin_pack = data->options.thin;
 816        args.verbose = (transport->verbose > 0);
 817        args.quiet = (transport->verbose < 0);
 818        args.progress = transport->progress;
 819        args.dry_run = !!(flags & TRANSPORT_PUSH_DRY_RUN);
 820        args.porcelain = !!(flags & TRANSPORT_PUSH_PORCELAIN);
 821
 822        ret = send_pack(&args, data->fd, data->conn, remote_refs,
 823                        &data->extra_have);
 824
 825        close(data->fd[1]);
 826        close(data->fd[0]);
 827        ret |= finish_connect(data->conn);
 828        data->conn = NULL;
 829        data->got_remote_heads = 0;
 830
 831        return ret;
 832}
 833
 834static int connect_git(struct transport *transport, const char *name,
 835                       const char *executable, int fd[2])
 836{
 837        struct git_transport_data *data = transport->data;
 838        data->conn = git_connect(data->fd, transport->url,
 839                                 executable, 0);
 840        fd[0] = data->fd[0];
 841        fd[1] = data->fd[1];
 842        return 0;
 843}
 844
 845static int disconnect_git(struct transport *transport)
 846{
 847        struct git_transport_data *data = transport->data;
 848        if (data->conn) {
 849                if (data->got_remote_heads)
 850                        packet_flush(data->fd[1]);
 851                close(data->fd[0]);
 852                close(data->fd[1]);
 853                finish_connect(data->conn);
 854        }
 855
 856        free(data);
 857        return 0;
 858}
 859
 860void transport_take_over(struct transport *transport,
 861                         struct child_process *child)
 862{
 863        struct git_transport_data *data;
 864
 865        if (!transport->smart_options)
 866                die("Bug detected: Taking over transport requires non-NULL "
 867                    "smart_options field.");
 868
 869        data = xcalloc(1, sizeof(*data));
 870        data->options = *transport->smart_options;
 871        data->conn = child;
 872        data->fd[0] = data->conn->out;
 873        data->fd[1] = data->conn->in;
 874        data->got_remote_heads = 0;
 875        transport->data = data;
 876
 877        transport->set_option = NULL;
 878        transport->get_refs_list = get_refs_via_connect;
 879        transport->fetch = fetch_refs_via_pack;
 880        transport->push = NULL;
 881        transport->push_refs = git_transport_push;
 882        transport->disconnect = disconnect_git;
 883        transport->smart_options = &(data->options);
 884
 885        transport->cannot_reuse = 1;
 886}
 887
 888static int is_local(const char *url)
 889{
 890        const char *colon = strchr(url, ':');
 891        const char *slash = strchr(url, '/');
 892        return !colon || (slash && slash < colon) ||
 893                has_dos_drive_prefix(url);
 894}
 895
 896static int is_file(const char *url)
 897{
 898        struct stat buf;
 899        if (stat(url, &buf))
 900                return 0;
 901        return S_ISREG(buf.st_mode);
 902}
 903
 904static int external_specification_len(const char *url)
 905{
 906        return strchr(url, ':') - url;
 907}
 908
 909struct transport *transport_get(struct remote *remote, const char *url)
 910{
 911        const char *helper;
 912        struct transport *ret = xcalloc(1, sizeof(*ret));
 913
 914        ret->progress = isatty(2);
 915
 916        if (!remote)
 917                die("No remote provided to transport_get()");
 918
 919        ret->got_remote_refs = 0;
 920        ret->remote = remote;
 921        helper = remote->foreign_vcs;
 922
 923        if (!url && remote->url)
 924                url = remote->url[0];
 925        ret->url = url;
 926
 927        /* maybe it is a foreign URL? */
 928        if (url) {
 929                const char *p = url;
 930
 931                while (is_urlschemechar(p == url, *p))
 932                        p++;
 933                if (!prefixcmp(p, "::"))
 934                        helper = xstrndup(url, p - url);
 935        }
 936
 937        if (helper) {
 938                transport_helper_init(ret, helper);
 939        } else if (!prefixcmp(url, "rsync:")) {
 940                ret->get_refs_list = get_refs_via_rsync;
 941                ret->fetch = fetch_objs_via_rsync;
 942                ret->push = rsync_transport_push;
 943                ret->smart_options = NULL;
 944        } else if (is_local(url) && is_file(url) && is_bundle(url, 1)) {
 945                struct bundle_transport_data *data = xcalloc(1, sizeof(*data));
 946                ret->data = data;
 947                ret->get_refs_list = get_refs_from_bundle;
 948                ret->fetch = fetch_refs_from_bundle;
 949                ret->disconnect = close_bundle;
 950                ret->smart_options = NULL;
 951        } else if (!is_url(url)
 952                || !prefixcmp(url, "file://")
 953                || !prefixcmp(url, "git://")
 954                || !prefixcmp(url, "ssh://")
 955                || !prefixcmp(url, "git+ssh://")
 956                || !prefixcmp(url, "ssh+git://")) {
 957                /* These are builtin smart transports. */
 958                struct git_transport_data *data = xcalloc(1, sizeof(*data));
 959                ret->data = data;
 960                ret->set_option = NULL;
 961                ret->get_refs_list = get_refs_via_connect;
 962                ret->fetch = fetch_refs_via_pack;
 963                ret->push_refs = git_transport_push;
 964                ret->connect = connect_git;
 965                ret->disconnect = disconnect_git;
 966                ret->smart_options = &(data->options);
 967
 968                data->conn = NULL;
 969                data->got_remote_heads = 0;
 970        } else {
 971                /* Unknown protocol in URL. Pass to external handler. */
 972                int len = external_specification_len(url);
 973                char *handler = xmalloc(len + 1);
 974                handler[len] = 0;
 975                strncpy(handler, url, len);
 976                transport_helper_init(ret, handler);
 977        }
 978
 979        if (ret->smart_options) {
 980                ret->smart_options->thin = 1;
 981                ret->smart_options->uploadpack = "git-upload-pack";
 982                if (remote->uploadpack)
 983                        ret->smart_options->uploadpack = remote->uploadpack;
 984                ret->smart_options->receivepack = "git-receive-pack";
 985                if (remote->receivepack)
 986                        ret->smart_options->receivepack = remote->receivepack;
 987        }
 988
 989        return ret;
 990}
 991
 992int transport_set_option(struct transport *transport,
 993                         const char *name, const char *value)
 994{
 995        int git_reports = 1, protocol_reports = 1;
 996
 997        if (transport->smart_options)
 998                git_reports = set_git_option(transport->smart_options,
 999                                             name, value);
1000
1001        if (transport->set_option)
1002                protocol_reports = transport->set_option(transport, name,
1003                                                        value);
1004
1005        /* If either report is 0, report 0 (success). */
1006        if (!git_reports || !protocol_reports)
1007                return 0;
1008        /* If either reports -1 (invalid value), report -1. */
1009        if ((git_reports == -1) || (protocol_reports == -1))
1010                return -1;
1011        /* Otherwise if both report unknown, report unknown. */
1012        return 1;
1013}
1014
1015void transport_set_verbosity(struct transport *transport, int verbosity,
1016        int force_progress)
1017{
1018        if (verbosity >= 1)
1019                transport->verbose = verbosity <= 3 ? verbosity : 3;
1020        if (verbosity < 0)
1021                transport->verbose = -1;
1022
1023        /**
1024         * Rules used to determine whether to report progress (processing aborts
1025         * when a rule is satisfied):
1026         *
1027         *   . Report progress, if force_progress is 1 (ie. --progress).
1028         *   . Don't report progress, if force_progress is 0 (ie. --no-progress).
1029         *   . Don't report progress, if verbosity < 0 (ie. -q/--quiet ).
1030         *   . Report progress if isatty(2) is 1.
1031         **/
1032        if (force_progress >= 0)
1033                transport->progress = !!force_progress;
1034        else
1035                transport->progress = verbosity >= 0 && isatty(2);
1036}
1037
1038static void die_with_unpushed_submodules(struct string_list *needs_pushing)
1039{
1040        int i;
1041
1042        fprintf(stderr, "The following submodule paths contain changes that can\n"
1043                        "not be found on any remote:\n");
1044        for (i = 0; i < needs_pushing->nr; i++)
1045                printf("  %s\n", needs_pushing->items[i].string);
1046        fprintf(stderr, "\nPlease try\n\n"
1047                        "       git push --recurse-submodules=on-demand\n\n"
1048                        "or cd to the path and use\n\n"
1049                        "       git push\n\n"
1050                        "to push them to a remote.\n\n");
1051
1052        string_list_clear(needs_pushing, 0);
1053
1054        die("Aborting.");
1055}
1056
1057static int run_pre_push_hook(struct transport *transport,
1058                             struct ref *remote_refs)
1059{
1060        int ret = 0, x;
1061        struct ref *r;
1062        struct child_process proc;
1063        struct strbuf buf;
1064        const char *argv[4];
1065
1066        if (!(argv[0] = find_hook("pre-push")))
1067                return 0;
1068
1069        argv[1] = transport->remote->name;
1070        argv[2] = transport->url;
1071        argv[3] = NULL;
1072
1073        memset(&proc, 0, sizeof(proc));
1074        proc.argv = argv;
1075        proc.in = -1;
1076
1077        if (start_command(&proc)) {
1078                finish_command(&proc);
1079                return -1;
1080        }
1081
1082        strbuf_init(&buf, 256);
1083
1084        for (r = remote_refs; r; r = r->next) {
1085                if (!r->peer_ref) continue;
1086                if (r->status == REF_STATUS_REJECT_NONFASTFORWARD) continue;
1087                if (r->status == REF_STATUS_REJECT_STALE) continue;
1088                if (r->status == REF_STATUS_UPTODATE) continue;
1089
1090                strbuf_reset(&buf);
1091                strbuf_addf( &buf, "%s %s %s %s\n",
1092                         r->peer_ref->name, sha1_to_hex(r->new_sha1),
1093                         r->name, sha1_to_hex(r->old_sha1));
1094
1095                if (write_in_full(proc.in, buf.buf, buf.len) != buf.len) {
1096                        ret = -1;
1097                        break;
1098                }
1099        }
1100
1101        strbuf_release(&buf);
1102
1103        x = close(proc.in);
1104        if (!ret)
1105                ret = x;
1106
1107        x = finish_command(&proc);
1108        if (!ret)
1109                ret = x;
1110
1111        return ret;
1112}
1113
1114int transport_push(struct transport *transport,
1115                   int refspec_nr, const char **refspec, int flags,
1116                   unsigned int *reject_reasons)
1117{
1118        *reject_reasons = 0;
1119        transport_verify_remote_names(refspec_nr, refspec);
1120
1121        if (transport->push) {
1122                /* Maybe FIXME. But no important transport uses this case. */
1123                if (flags & TRANSPORT_PUSH_SET_UPSTREAM)
1124                        die("This transport does not support using --set-upstream");
1125
1126                return transport->push(transport, refspec_nr, refspec, flags);
1127        } else if (transport->push_refs) {
1128                struct ref *remote_refs =
1129                        transport->get_refs_list(transport, 1);
1130                struct ref *local_refs = get_local_heads();
1131                int match_flags = MATCH_REFS_NONE;
1132                int verbose = (transport->verbose > 0);
1133                int quiet = (transport->verbose < 0);
1134                int porcelain = flags & TRANSPORT_PUSH_PORCELAIN;
1135                int pretend = flags & TRANSPORT_PUSH_DRY_RUN;
1136                int push_ret, ret, err;
1137
1138                if (flags & TRANSPORT_PUSH_ALL)
1139                        match_flags |= MATCH_REFS_ALL;
1140                if (flags & TRANSPORT_PUSH_MIRROR)
1141                        match_flags |= MATCH_REFS_MIRROR;
1142                if (flags & TRANSPORT_PUSH_PRUNE)
1143                        match_flags |= MATCH_REFS_PRUNE;
1144                if (flags & TRANSPORT_PUSH_FOLLOW_TAGS)
1145                        match_flags |= MATCH_REFS_FOLLOW_TAGS;
1146
1147                if (match_push_refs(local_refs, &remote_refs,
1148                                    refspec_nr, refspec, match_flags)) {
1149                        return -1;
1150                }
1151
1152                if (transport->smart_options &&
1153                    transport->smart_options->cas &&
1154                    !is_empty_cas(transport->smart_options->cas))
1155                        apply_push_cas(transport->smart_options->cas,
1156                                       transport->remote, remote_refs);
1157
1158                set_ref_status_for_push(remote_refs,
1159                        flags & TRANSPORT_PUSH_MIRROR,
1160                        flags & TRANSPORT_PUSH_FORCE);
1161
1162                if (!(flags & TRANSPORT_PUSH_NO_HOOK))
1163                        if (run_pre_push_hook(transport, remote_refs))
1164                                return -1;
1165
1166                if ((flags & TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND) && !is_bare_repository()) {
1167                        struct ref *ref = remote_refs;
1168                        for (; ref; ref = ref->next)
1169                                if (!is_null_sha1(ref->new_sha1) &&
1170                                    !push_unpushed_submodules(ref->new_sha1,
1171                                            transport->remote->name))
1172                                    die ("Failed to push all needed submodules!");
1173                }
1174
1175                if ((flags & (TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND |
1176                              TRANSPORT_RECURSE_SUBMODULES_CHECK)) && !is_bare_repository()) {
1177                        struct ref *ref = remote_refs;
1178                        struct string_list needs_pushing;
1179
1180                        memset(&needs_pushing, 0, sizeof(struct string_list));
1181                        needs_pushing.strdup_strings = 1;
1182                        for (; ref; ref = ref->next)
1183                                if (!is_null_sha1(ref->new_sha1) &&
1184                                    find_unpushed_submodules(ref->new_sha1,
1185                                            transport->remote->name, &needs_pushing))
1186                                        die_with_unpushed_submodules(&needs_pushing);
1187                }
1188
1189                push_ret = transport->push_refs(transport, remote_refs, flags);
1190                err = push_had_errors(remote_refs);
1191                ret = push_ret | err;
1192
1193                if (!quiet || err)
1194                        transport_print_push_status(transport->url, remote_refs,
1195                                        verbose | porcelain, porcelain,
1196                                        reject_reasons);
1197
1198                if (flags & TRANSPORT_PUSH_SET_UPSTREAM)
1199                        set_upstreams(transport, remote_refs, pretend);
1200
1201                if (!(flags & TRANSPORT_PUSH_DRY_RUN)) {
1202                        struct ref *ref;
1203                        for (ref = remote_refs; ref; ref = ref->next)
1204                                transport_update_tracking_ref(transport->remote, ref, verbose);
1205                }
1206
1207                if (porcelain && !push_ret)
1208                        puts("Done");
1209                else if (!quiet && !ret && !transport_refs_pushed(remote_refs))
1210                        fprintf(stderr, "Everything up-to-date\n");
1211
1212                return ret;
1213        }
1214        return 1;
1215}
1216
1217const struct ref *transport_get_remote_refs(struct transport *transport)
1218{
1219        if (!transport->got_remote_refs) {
1220                transport->remote_refs = transport->get_refs_list(transport, 0);
1221                transport->got_remote_refs = 1;
1222        }
1223
1224        return transport->remote_refs;
1225}
1226
1227int transport_fetch_refs(struct transport *transport, struct ref *refs)
1228{
1229        int rc;
1230        int nr_heads = 0, nr_alloc = 0, nr_refs = 0;
1231        struct ref **heads = NULL;
1232        struct ref *rm;
1233
1234        for (rm = refs; rm; rm = rm->next) {
1235                nr_refs++;
1236                if (rm->peer_ref &&
1237                    !is_null_sha1(rm->old_sha1) &&
1238                    !hashcmp(rm->peer_ref->old_sha1, rm->old_sha1))
1239                        continue;
1240                ALLOC_GROW(heads, nr_heads + 1, nr_alloc);
1241                heads[nr_heads++] = rm;
1242        }
1243
1244        if (!nr_heads) {
1245                /*
1246                 * When deepening of a shallow repository is requested,
1247                 * then local and remote refs are likely to still be equal.
1248                 * Just feed them all to the fetch method in that case.
1249                 * This condition shouldn't be met in a non-deepening fetch
1250                 * (see builtin/fetch.c:quickfetch()).
1251                 */
1252                heads = xmalloc(nr_refs * sizeof(*heads));
1253                for (rm = refs; rm; rm = rm->next)
1254                        heads[nr_heads++] = rm;
1255        }
1256
1257        rc = transport->fetch(transport, nr_heads, heads);
1258
1259        free(heads);
1260        return rc;
1261}
1262
1263void transport_unlock_pack(struct transport *transport)
1264{
1265        if (transport->pack_lockfile) {
1266                unlink_or_warn(transport->pack_lockfile);
1267                free(transport->pack_lockfile);
1268                transport->pack_lockfile = NULL;
1269        }
1270}
1271
1272int transport_connect(struct transport *transport, const char *name,
1273                      const char *exec, int fd[2])
1274{
1275        if (transport->connect)
1276                return transport->connect(transport, name, exec, fd);
1277        else
1278                die("Operation not supported by protocol");
1279}
1280
1281int transport_disconnect(struct transport *transport)
1282{
1283        int ret = 0;
1284        if (transport->disconnect)
1285                ret = transport->disconnect(transport);
1286        free(transport);
1287        return ret;
1288}
1289
1290/*
1291 * Strip username (and password) from a URL and return
1292 * it in a newly allocated string.
1293 */
1294char *transport_anonymize_url(const char *url)
1295{
1296        char *anon_url, *scheme_prefix, *anon_part;
1297        size_t anon_len, prefix_len = 0;
1298
1299        anon_part = strchr(url, '@');
1300        if (is_local(url) || !anon_part)
1301                goto literal_copy;
1302
1303        anon_len = strlen(++anon_part);
1304        scheme_prefix = strstr(url, "://");
1305        if (!scheme_prefix) {
1306                if (!strchr(anon_part, ':'))
1307                        /* cannot be "me@there:/path/name" */
1308                        goto literal_copy;
1309        } else {
1310                const char *cp;
1311                /* make sure scheme is reasonable */
1312                for (cp = url; cp < scheme_prefix; cp++) {
1313                        switch (*cp) {
1314                                /* RFC 1738 2.1 */
1315                        case '+': case '.': case '-':
1316                                break; /* ok */
1317                        default:
1318                                if (isalnum(*cp))
1319                                        break;
1320                                /* it isn't */
1321                                goto literal_copy;
1322                        }
1323                }
1324                /* @ past the first slash does not count */
1325                cp = strchr(scheme_prefix + 3, '/');
1326                if (cp && cp < anon_part)
1327                        goto literal_copy;
1328                prefix_len = scheme_prefix - url + 3;
1329        }
1330        anon_url = xcalloc(1, 1 + prefix_len + anon_len);
1331        memcpy(anon_url, url, prefix_len);
1332        memcpy(anon_url + prefix_len, anon_part, anon_len);
1333        return anon_url;
1334literal_copy:
1335        return xstrdup(url);
1336}
1337
1338struct alternate_refs_data {
1339        alternate_ref_fn *fn;
1340        void *data;
1341};
1342
1343static int refs_from_alternate_cb(struct alternate_object_database *e,
1344                                  void *data)
1345{
1346        char *other;
1347        size_t len;
1348        struct remote *remote;
1349        struct transport *transport;
1350        const struct ref *extra;
1351        struct alternate_refs_data *cb = data;
1352
1353        e->name[-1] = '\0';
1354        other = xstrdup(real_path(e->base));
1355        e->name[-1] = '/';
1356        len = strlen(other);
1357
1358        while (other[len-1] == '/')
1359                other[--len] = '\0';
1360        if (len < 8 || memcmp(other + len - 8, "/objects", 8))
1361                return 0;
1362        /* Is this a git repository with refs? */
1363        memcpy(other + len - 8, "/refs", 6);
1364        if (!is_directory(other))
1365                return 0;
1366        other[len - 8] = '\0';
1367        remote = remote_get(other);
1368        transport = transport_get(remote, other);
1369        for (extra = transport_get_remote_refs(transport);
1370             extra;
1371             extra = extra->next)
1372                cb->fn(extra, cb->data);
1373        transport_disconnect(transport);
1374        free(other);
1375        return 0;
1376}
1377
1378void for_each_alternate_ref(alternate_ref_fn fn, void *data)
1379{
1380        struct alternate_refs_data cb;
1381        cb.fn = fn;
1382        cb.data = data;
1383        foreach_alt_odb(refs_from_alternate_cb, &cb);
1384}