transport.con commit shallow.c: extend setup_*_shallow() to accept extra shallow commits (1a30f5a)
   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                        !prefixcmp(tmp, "refs/heads/"))
 174                        localname = tmp;
 175
 176                /* Both source and destination must be local branches. */
 177                if (!localname || prefixcmp(localname, "refs/heads/"))
 178                        continue;
 179                if (!remotename || prefixcmp(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 prefixcmp(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 && prefixcmp(name, "refs/heads/") &&
 301                        prefixcmp(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};
 460
 461static int set_git_option(struct git_transport_options *opts,
 462                          const char *name, const char *value)
 463{
 464        if (!strcmp(name, TRANS_OPT_UPLOADPACK)) {
 465                opts->uploadpack = value;
 466                return 0;
 467        } else if (!strcmp(name, TRANS_OPT_RECEIVEPACK)) {
 468                opts->receivepack = value;
 469                return 0;
 470        } else if (!strcmp(name, TRANS_OPT_THIN)) {
 471                opts->thin = !!value;
 472                return 0;
 473        } else if (!strcmp(name, TRANS_OPT_FOLLOWTAGS)) {
 474                opts->followtags = !!value;
 475                return 0;
 476        } else if (!strcmp(name, TRANS_OPT_KEEP)) {
 477                opts->keep = !!value;
 478                return 0;
 479        } else if (!strcmp(name, TRANS_OPT_DEPTH)) {
 480                if (!value)
 481                        opts->depth = 0;
 482                else {
 483                        char *end;
 484                        opts->depth = strtol(value, &end, 0);
 485                        if (*end)
 486                                die("transport: invalid depth option '%s'", value);
 487                }
 488                return 0;
 489        }
 490        return 1;
 491}
 492
 493static int connect_setup(struct transport *transport, int for_push, int verbose)
 494{
 495        struct git_transport_data *data = transport->data;
 496
 497        if (data->conn)
 498                return 0;
 499
 500        data->conn = git_connect(data->fd, transport->url,
 501                                 for_push ? data->options.receivepack :
 502                                 data->options.uploadpack,
 503                                 verbose ? CONNECT_VERBOSE : 0);
 504
 505        return 0;
 506}
 507
 508static struct ref *get_refs_via_connect(struct transport *transport, int for_push)
 509{
 510        struct git_transport_data *data = transport->data;
 511        struct ref *refs;
 512
 513        connect_setup(transport, for_push, 0);
 514        get_remote_heads(data->fd[0], NULL, 0, &refs,
 515                         for_push ? REF_NORMAL : 0, &data->extra_have, NULL);
 516        data->got_remote_heads = 1;
 517
 518        return refs;
 519}
 520
 521static int fetch_refs_via_pack(struct transport *transport,
 522                               int nr_heads, struct ref **to_fetch)
 523{
 524        struct git_transport_data *data = transport->data;
 525        const struct ref *refs;
 526        char *dest = xstrdup(transport->url);
 527        struct fetch_pack_args args;
 528        struct ref *refs_tmp = NULL;
 529
 530        memset(&args, 0, sizeof(args));
 531        args.uploadpack = data->options.uploadpack;
 532        args.keep_pack = data->options.keep;
 533        args.lock_pack = 1;
 534        args.use_thin_pack = data->options.thin;
 535        args.include_tag = data->options.followtags;
 536        args.verbose = (transport->verbose > 1);
 537        args.quiet = (transport->verbose < 0);
 538        args.no_progress = !transport->progress;
 539        args.depth = data->options.depth;
 540        args.check_self_contained_and_connected =
 541                data->options.check_self_contained_and_connected;
 542
 543        if (!data->got_remote_heads) {
 544                connect_setup(transport, 0, 0);
 545                get_remote_heads(data->fd[0], NULL, 0, &refs_tmp, 0,
 546                                 NULL, NULL);
 547                data->got_remote_heads = 1;
 548        }
 549
 550        refs = fetch_pack(&args, data->fd, data->conn,
 551                          refs_tmp ? refs_tmp : transport->remote_refs,
 552                          dest, to_fetch, nr_heads,
 553                          &transport->pack_lockfile);
 554        close(data->fd[0]);
 555        close(data->fd[1]);
 556        if (finish_connect(data->conn))
 557                refs = NULL;
 558        data->conn = NULL;
 559        data->got_remote_heads = 0;
 560        data->options.self_contained_and_connected =
 561                args.self_contained_and_connected;
 562
 563        free_refs(refs_tmp);
 564
 565        free(dest);
 566        return (refs ? 0 : -1);
 567}
 568
 569static int push_had_errors(struct ref *ref)
 570{
 571        for (; ref; ref = ref->next) {
 572                switch (ref->status) {
 573                case REF_STATUS_NONE:
 574                case REF_STATUS_UPTODATE:
 575                case REF_STATUS_OK:
 576                        break;
 577                default:
 578                        return 1;
 579                }
 580        }
 581        return 0;
 582}
 583
 584int transport_refs_pushed(struct ref *ref)
 585{
 586        for (; ref; ref = ref->next) {
 587                switch(ref->status) {
 588                case REF_STATUS_NONE:
 589                case REF_STATUS_UPTODATE:
 590                        break;
 591                default:
 592                        return 1;
 593                }
 594        }
 595        return 0;
 596}
 597
 598void transport_update_tracking_ref(struct remote *remote, struct ref *ref, int verbose)
 599{
 600        struct refspec rs;
 601
 602        if (ref->status != REF_STATUS_OK && ref->status != REF_STATUS_UPTODATE)
 603                return;
 604
 605        rs.src = ref->name;
 606        rs.dst = NULL;
 607
 608        if (!remote_find_tracking(remote, &rs)) {
 609                if (verbose)
 610                        fprintf(stderr, "updating local tracking ref '%s'\n", rs.dst);
 611                if (ref->deletion) {
 612                        delete_ref(rs.dst, NULL, 0);
 613                } else
 614                        update_ref("update by push", rs.dst,
 615                                        ref->new_sha1, NULL, 0, 0);
 616                free(rs.dst);
 617        }
 618}
 619
 620static void print_ref_status(char flag, const char *summary, struct ref *to, struct ref *from, const char *msg, int porcelain)
 621{
 622        if (porcelain) {
 623                if (from)
 624                        fprintf(stdout, "%c\t%s:%s\t", flag, from->name, to->name);
 625                else
 626                        fprintf(stdout, "%c\t:%s\t", flag, to->name);
 627                if (msg)
 628                        fprintf(stdout, "%s (%s)\n", summary, msg);
 629                else
 630                        fprintf(stdout, "%s\n", summary);
 631        } else {
 632                fprintf(stderr, " %c %-*s ", flag, TRANSPORT_SUMMARY_WIDTH, summary);
 633                if (from)
 634                        fprintf(stderr, "%s -> %s", prettify_refname(from->name), prettify_refname(to->name));
 635                else
 636                        fputs(prettify_refname(to->name), stderr);
 637                if (msg) {
 638                        fputs(" (", stderr);
 639                        fputs(msg, stderr);
 640                        fputc(')', stderr);
 641                }
 642                fputc('\n', stderr);
 643        }
 644}
 645
 646static const char *status_abbrev(unsigned char sha1[20])
 647{
 648        return find_unique_abbrev(sha1, DEFAULT_ABBREV);
 649}
 650
 651static void print_ok_ref_status(struct ref *ref, int porcelain)
 652{
 653        if (ref->deletion)
 654                print_ref_status('-', "[deleted]", ref, NULL, NULL, porcelain);
 655        else if (is_null_sha1(ref->old_sha1))
 656                print_ref_status('*',
 657                        (!prefixcmp(ref->name, "refs/tags/") ? "[new tag]" :
 658                        "[new branch]"),
 659                        ref, ref->peer_ref, NULL, porcelain);
 660        else {
 661                char quickref[84];
 662                char type;
 663                const char *msg;
 664
 665                strcpy(quickref, status_abbrev(ref->old_sha1));
 666                if (ref->forced_update) {
 667                        strcat(quickref, "...");
 668                        type = '+';
 669                        msg = "forced update";
 670                } else {
 671                        strcat(quickref, "..");
 672                        type = ' ';
 673                        msg = NULL;
 674                }
 675                strcat(quickref, status_abbrev(ref->new_sha1));
 676
 677                print_ref_status(type, quickref, ref, ref->peer_ref, msg, porcelain);
 678        }
 679}
 680
 681static int print_one_push_status(struct ref *ref, const char *dest, int count, int porcelain)
 682{
 683        if (!count)
 684                fprintf(porcelain ? stdout : stderr, "To %s\n", dest);
 685
 686        switch(ref->status) {
 687        case REF_STATUS_NONE:
 688                print_ref_status('X', "[no match]", ref, NULL, NULL, porcelain);
 689                break;
 690        case REF_STATUS_REJECT_NODELETE:
 691                print_ref_status('!', "[rejected]", ref, NULL,
 692                                                 "remote does not support deleting refs", porcelain);
 693                break;
 694        case REF_STATUS_UPTODATE:
 695                print_ref_status('=', "[up to date]", ref,
 696                                                 ref->peer_ref, NULL, porcelain);
 697                break;
 698        case REF_STATUS_REJECT_NONFASTFORWARD:
 699                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 700                                                 "non-fast-forward", porcelain);
 701                break;
 702        case REF_STATUS_REJECT_ALREADY_EXISTS:
 703                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 704                                                 "already exists", porcelain);
 705                break;
 706        case REF_STATUS_REJECT_FETCH_FIRST:
 707                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 708                                                 "fetch first", porcelain);
 709                break;
 710        case REF_STATUS_REJECT_NEEDS_FORCE:
 711                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 712                                                 "needs force", porcelain);
 713                break;
 714        case REF_STATUS_REJECT_STALE:
 715                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 716                                                 "stale info", porcelain);
 717                break;
 718        case REF_STATUS_REMOTE_REJECT:
 719                print_ref_status('!', "[remote rejected]", ref,
 720                                                 ref->deletion ? NULL : ref->peer_ref,
 721                                                 ref->remote_status, porcelain);
 722                break;
 723        case REF_STATUS_EXPECTING_REPORT:
 724                print_ref_status('!', "[remote failure]", ref,
 725                                                 ref->deletion ? NULL : ref->peer_ref,
 726                                                 "remote failed to report status", porcelain);
 727                break;
 728        case REF_STATUS_OK:
 729                print_ok_ref_status(ref, porcelain);
 730                break;
 731        }
 732
 733        return 1;
 734}
 735
 736void transport_print_push_status(const char *dest, struct ref *refs,
 737                                  int verbose, int porcelain, unsigned int *reject_reasons)
 738{
 739        struct ref *ref;
 740        int n = 0;
 741        unsigned char head_sha1[20];
 742        char *head;
 743
 744        head = resolve_refdup("HEAD", head_sha1, 1, NULL);
 745
 746        if (verbose) {
 747                for (ref = refs; ref; ref = ref->next)
 748                        if (ref->status == REF_STATUS_UPTODATE)
 749                                n += print_one_push_status(ref, dest, n, porcelain);
 750        }
 751
 752        for (ref = refs; ref; ref = ref->next)
 753                if (ref->status == REF_STATUS_OK)
 754                        n += print_one_push_status(ref, dest, n, porcelain);
 755
 756        *reject_reasons = 0;
 757        for (ref = refs; ref; ref = ref->next) {
 758                if (ref->status != REF_STATUS_NONE &&
 759                    ref->status != REF_STATUS_UPTODATE &&
 760                    ref->status != REF_STATUS_OK)
 761                        n += print_one_push_status(ref, dest, n, porcelain);
 762                if (ref->status == REF_STATUS_REJECT_NONFASTFORWARD) {
 763                        if (head != NULL && !strcmp(head, ref->name))
 764                                *reject_reasons |= REJECT_NON_FF_HEAD;
 765                        else
 766                                *reject_reasons |= REJECT_NON_FF_OTHER;
 767                } else if (ref->status == REF_STATUS_REJECT_ALREADY_EXISTS) {
 768                        *reject_reasons |= REJECT_ALREADY_EXISTS;
 769                } else if (ref->status == REF_STATUS_REJECT_FETCH_FIRST) {
 770                        *reject_reasons |= REJECT_FETCH_FIRST;
 771                } else if (ref->status == REF_STATUS_REJECT_NEEDS_FORCE) {
 772                        *reject_reasons |= REJECT_NEEDS_FORCE;
 773                }
 774        }
 775}
 776
 777void transport_verify_remote_names(int nr_heads, const char **heads)
 778{
 779        int i;
 780
 781        for (i = 0; i < nr_heads; i++) {
 782                const char *local = heads[i];
 783                const char *remote = strrchr(heads[i], ':');
 784
 785                if (*local == '+')
 786                        local++;
 787
 788                /* A matching refspec is okay.  */
 789                if (remote == local && remote[1] == '\0')
 790                        continue;
 791
 792                remote = remote ? (remote + 1) : local;
 793                if (check_refname_format(remote,
 794                                REFNAME_ALLOW_ONELEVEL|REFNAME_REFSPEC_PATTERN))
 795                        die("remote part of refspec is not a valid name in %s",
 796                                heads[i]);
 797        }
 798}
 799
 800static int git_transport_push(struct transport *transport, struct ref *remote_refs, int flags)
 801{
 802        struct git_transport_data *data = transport->data;
 803        struct send_pack_args args;
 804        int ret;
 805
 806        if (!data->got_remote_heads) {
 807                struct ref *tmp_refs;
 808                connect_setup(transport, 1, 0);
 809
 810                get_remote_heads(data->fd[0], NULL, 0, &tmp_refs, REF_NORMAL, NULL, NULL);
 811                data->got_remote_heads = 1;
 812        }
 813
 814        memset(&args, 0, sizeof(args));
 815        args.send_mirror = !!(flags & TRANSPORT_PUSH_MIRROR);
 816        args.force_update = !!(flags & TRANSPORT_PUSH_FORCE);
 817        args.use_thin_pack = data->options.thin;
 818        args.verbose = (transport->verbose > 0);
 819        args.quiet = (transport->verbose < 0);
 820        args.progress = transport->progress;
 821        args.dry_run = !!(flags & TRANSPORT_PUSH_DRY_RUN);
 822        args.porcelain = !!(flags & TRANSPORT_PUSH_PORCELAIN);
 823
 824        ret = send_pack(&args, data->fd, data->conn, remote_refs,
 825                        &data->extra_have);
 826
 827        close(data->fd[1]);
 828        close(data->fd[0]);
 829        ret |= finish_connect(data->conn);
 830        data->conn = NULL;
 831        data->got_remote_heads = 0;
 832
 833        return ret;
 834}
 835
 836static int connect_git(struct transport *transport, const char *name,
 837                       const char *executable, int fd[2])
 838{
 839        struct git_transport_data *data = transport->data;
 840        data->conn = git_connect(data->fd, transport->url,
 841                                 executable, 0);
 842        fd[0] = data->fd[0];
 843        fd[1] = data->fd[1];
 844        return 0;
 845}
 846
 847static int disconnect_git(struct transport *transport)
 848{
 849        struct git_transport_data *data = transport->data;
 850        if (data->conn) {
 851                if (data->got_remote_heads)
 852                        packet_flush(data->fd[1]);
 853                close(data->fd[0]);
 854                close(data->fd[1]);
 855                finish_connect(data->conn);
 856        }
 857
 858        free(data);
 859        return 0;
 860}
 861
 862void transport_take_over(struct transport *transport,
 863                         struct child_process *child)
 864{
 865        struct git_transport_data *data;
 866
 867        if (!transport->smart_options)
 868                die("Bug detected: Taking over transport requires non-NULL "
 869                    "smart_options field.");
 870
 871        data = xcalloc(1, sizeof(*data));
 872        data->options = *transport->smart_options;
 873        data->conn = child;
 874        data->fd[0] = data->conn->out;
 875        data->fd[1] = data->conn->in;
 876        data->got_remote_heads = 0;
 877        transport->data = data;
 878
 879        transport->set_option = NULL;
 880        transport->get_refs_list = get_refs_via_connect;
 881        transport->fetch = fetch_refs_via_pack;
 882        transport->push = NULL;
 883        transport->push_refs = git_transport_push;
 884        transport->disconnect = disconnect_git;
 885        transport->smart_options = &(data->options);
 886
 887        transport->cannot_reuse = 1;
 888}
 889
 890static int is_local(const char *url)
 891{
 892        const char *colon = strchr(url, ':');
 893        const char *slash = strchr(url, '/');
 894        return !colon || (slash && slash < colon) ||
 895                has_dos_drive_prefix(url);
 896}
 897
 898static int is_file(const char *url)
 899{
 900        struct stat buf;
 901        if (stat(url, &buf))
 902                return 0;
 903        return S_ISREG(buf.st_mode);
 904}
 905
 906static int external_specification_len(const char *url)
 907{
 908        return strchr(url, ':') - url;
 909}
 910
 911struct transport *transport_get(struct remote *remote, const char *url)
 912{
 913        const char *helper;
 914        struct transport *ret = xcalloc(1, sizeof(*ret));
 915
 916        ret->progress = isatty(2);
 917
 918        if (!remote)
 919                die("No remote provided to transport_get()");
 920
 921        ret->got_remote_refs = 0;
 922        ret->remote = remote;
 923        helper = remote->foreign_vcs;
 924
 925        if (!url && remote->url)
 926                url = remote->url[0];
 927        ret->url = url;
 928
 929        /* maybe it is a foreign URL? */
 930        if (url) {
 931                const char *p = url;
 932
 933                while (is_urlschemechar(p == url, *p))
 934                        p++;
 935                if (!prefixcmp(p, "::"))
 936                        helper = xstrndup(url, p - url);
 937        }
 938
 939        if (helper) {
 940                transport_helper_init(ret, helper);
 941        } else if (!prefixcmp(url, "rsync:")) {
 942                ret->get_refs_list = get_refs_via_rsync;
 943                ret->fetch = fetch_objs_via_rsync;
 944                ret->push = rsync_transport_push;
 945                ret->smart_options = NULL;
 946        } else if (is_local(url) && is_file(url) && is_bundle(url, 1)) {
 947                struct bundle_transport_data *data = xcalloc(1, sizeof(*data));
 948                ret->data = data;
 949                ret->get_refs_list = get_refs_from_bundle;
 950                ret->fetch = fetch_refs_from_bundle;
 951                ret->disconnect = close_bundle;
 952                ret->smart_options = NULL;
 953        } else if (!is_url(url)
 954                || !prefixcmp(url, "file://")
 955                || !prefixcmp(url, "git://")
 956                || !prefixcmp(url, "ssh://")
 957                || !prefixcmp(url, "git+ssh://")
 958                || !prefixcmp(url, "ssh+git://")) {
 959                /* These are builtin smart transports. */
 960                struct git_transport_data *data = xcalloc(1, sizeof(*data));
 961                ret->data = data;
 962                ret->set_option = NULL;
 963                ret->get_refs_list = get_refs_via_connect;
 964                ret->fetch = fetch_refs_via_pack;
 965                ret->push_refs = git_transport_push;
 966                ret->connect = connect_git;
 967                ret->disconnect = disconnect_git;
 968                ret->smart_options = &(data->options);
 969
 970                data->conn = NULL;
 971                data->got_remote_heads = 0;
 972        } else {
 973                /* Unknown protocol in URL. Pass to external handler. */
 974                int len = external_specification_len(url);
 975                char *handler = xmalloc(len + 1);
 976                handler[len] = 0;
 977                strncpy(handler, url, len);
 978                transport_helper_init(ret, handler);
 979        }
 980
 981        if (ret->smart_options) {
 982                ret->smart_options->thin = 1;
 983                ret->smart_options->uploadpack = "git-upload-pack";
 984                if (remote->uploadpack)
 985                        ret->smart_options->uploadpack = remote->uploadpack;
 986                ret->smart_options->receivepack = "git-receive-pack";
 987                if (remote->receivepack)
 988                        ret->smart_options->receivepack = remote->receivepack;
 989        }
 990
 991        return ret;
 992}
 993
 994int transport_set_option(struct transport *transport,
 995                         const char *name, const char *value)
 996{
 997        int git_reports = 1, protocol_reports = 1;
 998
 999        if (transport->smart_options)
1000                git_reports = set_git_option(transport->smart_options,
1001                                             name, value);
1002
1003        if (transport->set_option)
1004                protocol_reports = transport->set_option(transport, name,
1005                                                        value);
1006
1007        /* If either report is 0, report 0 (success). */
1008        if (!git_reports || !protocol_reports)
1009                return 0;
1010        /* If either reports -1 (invalid value), report -1. */
1011        if ((git_reports == -1) || (protocol_reports == -1))
1012                return -1;
1013        /* Otherwise if both report unknown, report unknown. */
1014        return 1;
1015}
1016
1017void transport_set_verbosity(struct transport *transport, int verbosity,
1018        int force_progress)
1019{
1020        if (verbosity >= 1)
1021                transport->verbose = verbosity <= 3 ? verbosity : 3;
1022        if (verbosity < 0)
1023                transport->verbose = -1;
1024
1025        /**
1026         * Rules used to determine whether to report progress (processing aborts
1027         * when a rule is satisfied):
1028         *
1029         *   . Report progress, if force_progress is 1 (ie. --progress).
1030         *   . Don't report progress, if force_progress is 0 (ie. --no-progress).
1031         *   . Don't report progress, if verbosity < 0 (ie. -q/--quiet ).
1032         *   . Report progress if isatty(2) is 1.
1033         **/
1034        if (force_progress >= 0)
1035                transport->progress = !!force_progress;
1036        else
1037                transport->progress = verbosity >= 0 && isatty(2);
1038}
1039
1040static void die_with_unpushed_submodules(struct string_list *needs_pushing)
1041{
1042        int i;
1043
1044        fprintf(stderr, "The following submodule paths contain changes that can\n"
1045                        "not be found on any remote:\n");
1046        for (i = 0; i < needs_pushing->nr; i++)
1047                printf("  %s\n", needs_pushing->items[i].string);
1048        fprintf(stderr, "\nPlease try\n\n"
1049                        "       git push --recurse-submodules=on-demand\n\n"
1050                        "or cd to the path and use\n\n"
1051                        "       git push\n\n"
1052                        "to push them to a remote.\n\n");
1053
1054        string_list_clear(needs_pushing, 0);
1055
1056        die("Aborting.");
1057}
1058
1059static int run_pre_push_hook(struct transport *transport,
1060                             struct ref *remote_refs)
1061{
1062        int ret = 0, x;
1063        struct ref *r;
1064        struct child_process proc;
1065        struct strbuf buf;
1066        const char *argv[4];
1067
1068        if (!(argv[0] = find_hook("pre-push")))
1069                return 0;
1070
1071        argv[1] = transport->remote->name;
1072        argv[2] = transport->url;
1073        argv[3] = NULL;
1074
1075        memset(&proc, 0, sizeof(proc));
1076        proc.argv = argv;
1077        proc.in = -1;
1078
1079        if (start_command(&proc)) {
1080                finish_command(&proc);
1081                return -1;
1082        }
1083
1084        strbuf_init(&buf, 256);
1085
1086        for (r = remote_refs; r; r = r->next) {
1087                if (!r->peer_ref) continue;
1088                if (r->status == REF_STATUS_REJECT_NONFASTFORWARD) continue;
1089                if (r->status == REF_STATUS_REJECT_STALE) continue;
1090                if (r->status == REF_STATUS_UPTODATE) continue;
1091
1092                strbuf_reset(&buf);
1093                strbuf_addf( &buf, "%s %s %s %s\n",
1094                         r->peer_ref->name, sha1_to_hex(r->new_sha1),
1095                         r->name, sha1_to_hex(r->old_sha1));
1096
1097                if (write_in_full(proc.in, buf.buf, buf.len) != buf.len) {
1098                        ret = -1;
1099                        break;
1100                }
1101        }
1102
1103        strbuf_release(&buf);
1104
1105        x = close(proc.in);
1106        if (!ret)
1107                ret = x;
1108
1109        x = finish_command(&proc);
1110        if (!ret)
1111                ret = x;
1112
1113        return ret;
1114}
1115
1116int transport_push(struct transport *transport,
1117                   int refspec_nr, const char **refspec, int flags,
1118                   unsigned int *reject_reasons)
1119{
1120        *reject_reasons = 0;
1121        transport_verify_remote_names(refspec_nr, refspec);
1122
1123        if (transport->push) {
1124                /* Maybe FIXME. But no important transport uses this case. */
1125                if (flags & TRANSPORT_PUSH_SET_UPSTREAM)
1126                        die("This transport does not support using --set-upstream");
1127
1128                return transport->push(transport, refspec_nr, refspec, flags);
1129        } else if (transport->push_refs) {
1130                struct ref *remote_refs =
1131                        transport->get_refs_list(transport, 1);
1132                struct ref *local_refs = get_local_heads();
1133                int match_flags = MATCH_REFS_NONE;
1134                int verbose = (transport->verbose > 0);
1135                int quiet = (transport->verbose < 0);
1136                int porcelain = flags & TRANSPORT_PUSH_PORCELAIN;
1137                int pretend = flags & TRANSPORT_PUSH_DRY_RUN;
1138                int push_ret, ret, err;
1139
1140                if (flags & TRANSPORT_PUSH_ALL)
1141                        match_flags |= MATCH_REFS_ALL;
1142                if (flags & TRANSPORT_PUSH_MIRROR)
1143                        match_flags |= MATCH_REFS_MIRROR;
1144                if (flags & TRANSPORT_PUSH_PRUNE)
1145                        match_flags |= MATCH_REFS_PRUNE;
1146                if (flags & TRANSPORT_PUSH_FOLLOW_TAGS)
1147                        match_flags |= MATCH_REFS_FOLLOW_TAGS;
1148
1149                if (match_push_refs(local_refs, &remote_refs,
1150                                    refspec_nr, refspec, match_flags)) {
1151                        return -1;
1152                }
1153
1154                if (transport->smart_options &&
1155                    transport->smart_options->cas &&
1156                    !is_empty_cas(transport->smart_options->cas))
1157                        apply_push_cas(transport->smart_options->cas,
1158                                       transport->remote, remote_refs);
1159
1160                set_ref_status_for_push(remote_refs,
1161                        flags & TRANSPORT_PUSH_MIRROR,
1162                        flags & TRANSPORT_PUSH_FORCE);
1163
1164                if (!(flags & TRANSPORT_PUSH_NO_HOOK))
1165                        if (run_pre_push_hook(transport, remote_refs))
1166                                return -1;
1167
1168                if ((flags & TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND) && !is_bare_repository()) {
1169                        struct ref *ref = remote_refs;
1170                        for (; ref; ref = ref->next)
1171                                if (!is_null_sha1(ref->new_sha1) &&
1172                                    !push_unpushed_submodules(ref->new_sha1,
1173                                            transport->remote->name))
1174                                    die ("Failed to push all needed submodules!");
1175                }
1176
1177                if ((flags & (TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND |
1178                              TRANSPORT_RECURSE_SUBMODULES_CHECK)) && !is_bare_repository()) {
1179                        struct ref *ref = remote_refs;
1180                        struct string_list needs_pushing;
1181
1182                        memset(&needs_pushing, 0, sizeof(struct string_list));
1183                        needs_pushing.strdup_strings = 1;
1184                        for (; ref; ref = ref->next)
1185                                if (!is_null_sha1(ref->new_sha1) &&
1186                                    find_unpushed_submodules(ref->new_sha1,
1187                                            transport->remote->name, &needs_pushing))
1188                                        die_with_unpushed_submodules(&needs_pushing);
1189                }
1190
1191                push_ret = transport->push_refs(transport, remote_refs, flags);
1192                err = push_had_errors(remote_refs);
1193                ret = push_ret | err;
1194
1195                if (!quiet || err)
1196                        transport_print_push_status(transport->url, remote_refs,
1197                                        verbose | porcelain, porcelain,
1198                                        reject_reasons);
1199
1200                if (flags & TRANSPORT_PUSH_SET_UPSTREAM)
1201                        set_upstreams(transport, remote_refs, pretend);
1202
1203                if (!(flags & TRANSPORT_PUSH_DRY_RUN)) {
1204                        struct ref *ref;
1205                        for (ref = remote_refs; ref; ref = ref->next)
1206                                transport_update_tracking_ref(transport->remote, ref, verbose);
1207                }
1208
1209                if (porcelain && !push_ret)
1210                        puts("Done");
1211                else if (!quiet && !ret && !transport_refs_pushed(remote_refs))
1212                        fprintf(stderr, "Everything up-to-date\n");
1213
1214                return ret;
1215        }
1216        return 1;
1217}
1218
1219const struct ref *transport_get_remote_refs(struct transport *transport)
1220{
1221        if (!transport->got_remote_refs) {
1222                transport->remote_refs = transport->get_refs_list(transport, 0);
1223                transport->got_remote_refs = 1;
1224        }
1225
1226        return transport->remote_refs;
1227}
1228
1229int transport_fetch_refs(struct transport *transport, struct ref *refs)
1230{
1231        int rc;
1232        int nr_heads = 0, nr_alloc = 0, nr_refs = 0;
1233        struct ref **heads = NULL;
1234        struct ref *rm;
1235
1236        for (rm = refs; rm; rm = rm->next) {
1237                nr_refs++;
1238                if (rm->peer_ref &&
1239                    !is_null_sha1(rm->old_sha1) &&
1240                    !hashcmp(rm->peer_ref->old_sha1, rm->old_sha1))
1241                        continue;
1242                ALLOC_GROW(heads, nr_heads + 1, nr_alloc);
1243                heads[nr_heads++] = rm;
1244        }
1245
1246        if (!nr_heads) {
1247                /*
1248                 * When deepening of a shallow repository is requested,
1249                 * then local and remote refs are likely to still be equal.
1250                 * Just feed them all to the fetch method in that case.
1251                 * This condition shouldn't be met in a non-deepening fetch
1252                 * (see builtin/fetch.c:quickfetch()).
1253                 */
1254                heads = xmalloc(nr_refs * sizeof(*heads));
1255                for (rm = refs; rm; rm = rm->next)
1256                        heads[nr_heads++] = rm;
1257        }
1258
1259        rc = transport->fetch(transport, nr_heads, heads);
1260
1261        free(heads);
1262        return rc;
1263}
1264
1265void transport_unlock_pack(struct transport *transport)
1266{
1267        if (transport->pack_lockfile) {
1268                unlink_or_warn(transport->pack_lockfile);
1269                free(transport->pack_lockfile);
1270                transport->pack_lockfile = NULL;
1271        }
1272}
1273
1274int transport_connect(struct transport *transport, const char *name,
1275                      const char *exec, int fd[2])
1276{
1277        if (transport->connect)
1278                return transport->connect(transport, name, exec, fd);
1279        else
1280                die("Operation not supported by protocol");
1281}
1282
1283int transport_disconnect(struct transport *transport)
1284{
1285        int ret = 0;
1286        if (transport->disconnect)
1287                ret = transport->disconnect(transport);
1288        free(transport);
1289        return ret;
1290}
1291
1292/*
1293 * Strip username (and password) from a URL and return
1294 * it in a newly allocated string.
1295 */
1296char *transport_anonymize_url(const char *url)
1297{
1298        char *anon_url, *scheme_prefix, *anon_part;
1299        size_t anon_len, prefix_len = 0;
1300
1301        anon_part = strchr(url, '@');
1302        if (is_local(url) || !anon_part)
1303                goto literal_copy;
1304
1305        anon_len = strlen(++anon_part);
1306        scheme_prefix = strstr(url, "://");
1307        if (!scheme_prefix) {
1308                if (!strchr(anon_part, ':'))
1309                        /* cannot be "me@there:/path/name" */
1310                        goto literal_copy;
1311        } else {
1312                const char *cp;
1313                /* make sure scheme is reasonable */
1314                for (cp = url; cp < scheme_prefix; cp++) {
1315                        switch (*cp) {
1316                                /* RFC 1738 2.1 */
1317                        case '+': case '.': case '-':
1318                                break; /* ok */
1319                        default:
1320                                if (isalnum(*cp))
1321                                        break;
1322                                /* it isn't */
1323                                goto literal_copy;
1324                        }
1325                }
1326                /* @ past the first slash does not count */
1327                cp = strchr(scheme_prefix + 3, '/');
1328                if (cp && cp < anon_part)
1329                        goto literal_copy;
1330                prefix_len = scheme_prefix - url + 3;
1331        }
1332        anon_url = xcalloc(1, 1 + prefix_len + anon_len);
1333        memcpy(anon_url, url, prefix_len);
1334        memcpy(anon_url + prefix_len, anon_part, anon_len);
1335        return anon_url;
1336literal_copy:
1337        return xstrdup(url);
1338}
1339
1340struct alternate_refs_data {
1341        alternate_ref_fn *fn;
1342        void *data;
1343};
1344
1345static int refs_from_alternate_cb(struct alternate_object_database *e,
1346                                  void *data)
1347{
1348        char *other;
1349        size_t len;
1350        struct remote *remote;
1351        struct transport *transport;
1352        const struct ref *extra;
1353        struct alternate_refs_data *cb = data;
1354
1355        e->name[-1] = '\0';
1356        other = xstrdup(real_path(e->base));
1357        e->name[-1] = '/';
1358        len = strlen(other);
1359
1360        while (other[len-1] == '/')
1361                other[--len] = '\0';
1362        if (len < 8 || memcmp(other + len - 8, "/objects", 8))
1363                return 0;
1364        /* Is this a git repository with refs? */
1365        memcpy(other + len - 8, "/refs", 6);
1366        if (!is_directory(other))
1367                return 0;
1368        other[len - 8] = '\0';
1369        remote = remote_get(other);
1370        transport = transport_get(remote, other);
1371        for (extra = transport_get_remote_refs(transport);
1372             extra;
1373             extra = extra->next)
1374                cb->fn(extra, cb->data);
1375        transport_disconnect(transport);
1376        free(other);
1377        return 0;
1378}
1379
1380void for_each_alternate_ref(alternate_ref_fn fn, void *data)
1381{
1382        struct alternate_refs_data cb;
1383        cb.fn = fn;
1384        cb.data = data;
1385        foreach_alt_odb(refs_from_alternate_cb, &cb);
1386}