transport.con commit t5541: fix url scrubbing test when GPG is not set (68f3c07)
   1#include "cache.h"
   2#include "transport.h"
   3#include "run-command.h"
   4#include "pkt-line.h"
   5#include "fetch-pack.h"
   6#include "remote.h"
   7#include "connect.h"
   8#include "send-pack.h"
   9#include "walker.h"
  10#include "bundle.h"
  11#include "dir.h"
  12#include "refs.h"
  13#include "branch.h"
  14#include "url.h"
  15#include "submodule.h"
  16#include "string-list.h"
  17#include "sha1-array.h"
  18
  19/* rsync support */
  20
  21/*
  22 * We copy packed-refs and refs/ into a temporary file, then read the
  23 * loose refs recursively (sorting whenever possible), and then inserting
  24 * those packed refs that are not yet in the list (not validating, but
  25 * assuming that the file is sorted).
  26 *
  27 * Appears refactoring this from refs.c is too cumbersome.
  28 */
  29
  30static int str_cmp(const void *a, const void *b)
  31{
  32        const char *s1 = a;
  33        const char *s2 = b;
  34
  35        return strcmp(s1, s2);
  36}
  37
  38/* path->buf + name_offset is expected to point to "refs/" */
  39
  40static int read_loose_refs(struct strbuf *path, int name_offset,
  41                struct ref **tail)
  42{
  43        DIR *dir = opendir(path->buf);
  44        struct dirent *de;
  45        struct {
  46                char **entries;
  47                int nr, alloc;
  48        } list;
  49        int i, pathlen;
  50
  51        if (!dir)
  52                return -1;
  53
  54        memset (&list, 0, sizeof(list));
  55
  56        while ((de = readdir(dir))) {
  57                if (is_dot_or_dotdot(de->d_name))
  58                        continue;
  59                ALLOC_GROW(list.entries, list.nr + 1, list.alloc);
  60                list.entries[list.nr++] = xstrdup(de->d_name);
  61        }
  62        closedir(dir);
  63
  64        /* sort the list */
  65
  66        qsort(list.entries, list.nr, sizeof(char *), str_cmp);
  67
  68        pathlen = path->len;
  69        strbuf_addch(path, '/');
  70
  71        for (i = 0; i < list.nr; i++, strbuf_setlen(path, pathlen + 1)) {
  72                strbuf_addstr(path, list.entries[i]);
  73                if (read_loose_refs(path, name_offset, tail)) {
  74                        int fd = open(path->buf, O_RDONLY);
  75                        char buffer[40];
  76                        struct ref *next;
  77
  78                        if (fd < 0)
  79                                continue;
  80                        next = alloc_ref(path->buf + name_offset);
  81                        if (read_in_full(fd, buffer, 40) != 40 ||
  82                                        get_sha1_hex(buffer, next->old_sha1)) {
  83                                close(fd);
  84                                free(next);
  85                                continue;
  86                        }
  87                        close(fd);
  88                        (*tail)->next = next;
  89                        *tail = next;
  90                }
  91        }
  92        strbuf_setlen(path, pathlen);
  93
  94        for (i = 0; i < list.nr; i++)
  95                free(list.entries[i]);
  96        free(list.entries);
  97
  98        return 0;
  99}
 100
 101/* insert the packed refs for which no loose refs were found */
 102
 103static void insert_packed_refs(const char *packed_refs, struct ref **list)
 104{
 105        FILE *f = fopen(packed_refs, "r");
 106        static char buffer[PATH_MAX];
 107
 108        if (!f)
 109                return;
 110
 111        for (;;) {
 112                int cmp = 0; /* assigned before used */
 113                int len;
 114
 115                if (!fgets(buffer, sizeof(buffer), f)) {
 116                        fclose(f);
 117                        return;
 118                }
 119
 120                if (!isxdigit(buffer[0]))
 121                        continue;
 122                len = strlen(buffer);
 123                if (len && buffer[len - 1] == '\n')
 124                        buffer[--len] = '\0';
 125                if (len < 41)
 126                        continue;
 127                while ((*list)->next &&
 128                                (cmp = strcmp(buffer + 41,
 129                                      (*list)->next->name)) > 0)
 130                        list = &(*list)->next;
 131                if (!(*list)->next || cmp < 0) {
 132                        struct ref *next = alloc_ref(buffer + 41);
 133                        buffer[40] = '\0';
 134                        if (get_sha1_hex(buffer, next->old_sha1)) {
 135                                warning ("invalid SHA-1: %s", buffer);
 136                                free(next);
 137                                continue;
 138                        }
 139                        next->next = (*list)->next;
 140                        (*list)->next = next;
 141                        list = &(*list)->next;
 142                }
 143        }
 144}
 145
 146static void set_upstreams(struct transport *transport, struct ref *refs,
 147        int pretend)
 148{
 149        struct ref *ref;
 150        for (ref = refs; ref; ref = ref->next) {
 151                const char *localname;
 152                const char *tmp;
 153                const char *remotename;
 154                unsigned char sha[20];
 155                int flag = 0;
 156                /*
 157                 * Check suitability for tracking. Must be successful /
 158                 * already up-to-date ref create/modify (not delete).
 159                 */
 160                if (ref->status != REF_STATUS_OK &&
 161                        ref->status != REF_STATUS_UPTODATE)
 162                        continue;
 163                if (!ref->peer_ref)
 164                        continue;
 165                if (is_null_sha1(ref->new_sha1))
 166                        continue;
 167
 168                /* Follow symbolic refs (mainly for HEAD). */
 169                localname = ref->peer_ref->name;
 170                remotename = ref->name;
 171                tmp = resolve_ref_unsafe(localname, RESOLVE_REF_READING,
 172                                         sha, &flag);
 173                if (tmp && flag & REF_ISSYMREF &&
 174                        starts_with(tmp, "refs/heads/"))
 175                        localname = tmp;
 176
 177                /* Both source and destination must be local branches. */
 178                if (!localname || !starts_with(localname, "refs/heads/"))
 179                        continue;
 180                if (!remotename || !starts_with(remotename, "refs/heads/"))
 181                        continue;
 182
 183                if (!pretend)
 184                        install_branch_config(BRANCH_CONFIG_VERBOSE,
 185                                localname + 11, transport->remote->name,
 186                                remotename);
 187                else
 188                        printf("Would set upstream of '%s' to '%s' of '%s'\n",
 189                                localname + 11, remotename + 11,
 190                                transport->remote->name);
 191        }
 192}
 193
 194static const char *rsync_url(const char *url)
 195{
 196        if (!starts_with(url, "rsync://"))
 197                skip_prefix(url, "rsync:", &url);
 198        return url;
 199}
 200
 201static struct ref *get_refs_via_rsync(struct transport *transport, int for_push)
 202{
 203        struct strbuf buf = STRBUF_INIT, temp_dir = STRBUF_INIT;
 204        struct ref dummy = {NULL}, *tail = &dummy;
 205        struct child_process rsync = CHILD_PROCESS_INIT;
 206        const char *args[5];
 207        int temp_dir_len;
 208
 209        if (for_push)
 210                return NULL;
 211
 212        /* copy the refs to the temporary directory */
 213
 214        strbuf_addstr(&temp_dir, git_path("rsync-refs-XXXXXX"));
 215        if (!mkdtemp(temp_dir.buf))
 216                die_errno ("Could not make temporary directory");
 217        temp_dir_len = temp_dir.len;
 218
 219        strbuf_addstr(&buf, rsync_url(transport->url));
 220        strbuf_addstr(&buf, "/refs");
 221
 222        rsync.argv = args;
 223        rsync.stdout_to_stderr = 1;
 224        args[0] = "rsync";
 225        args[1] = (transport->verbose > 1) ? "-rv" : "-r";
 226        args[2] = buf.buf;
 227        args[3] = temp_dir.buf;
 228        args[4] = NULL;
 229
 230        if (run_command(&rsync))
 231                die ("Could not run rsync to get refs");
 232
 233        strbuf_reset(&buf);
 234        strbuf_addstr(&buf, rsync_url(transport->url));
 235        strbuf_addstr(&buf, "/packed-refs");
 236
 237        args[2] = buf.buf;
 238
 239        if (run_command(&rsync))
 240                die ("Could not run rsync to get refs");
 241
 242        /* read the copied refs */
 243
 244        strbuf_addstr(&temp_dir, "/refs");
 245        read_loose_refs(&temp_dir, temp_dir_len + 1, &tail);
 246        strbuf_setlen(&temp_dir, temp_dir_len);
 247
 248        tail = &dummy;
 249        strbuf_addstr(&temp_dir, "/packed-refs");
 250        insert_packed_refs(temp_dir.buf, &tail);
 251        strbuf_setlen(&temp_dir, temp_dir_len);
 252
 253        if (remove_dir_recursively(&temp_dir, 0))
 254                warning ("Error removing temporary directory %s.",
 255                                temp_dir.buf);
 256
 257        strbuf_release(&buf);
 258        strbuf_release(&temp_dir);
 259
 260        return dummy.next;
 261}
 262
 263static int fetch_objs_via_rsync(struct transport *transport,
 264                                int nr_objs, struct ref **to_fetch)
 265{
 266        struct child_process rsync = CHILD_PROCESS_INIT;
 267
 268        rsync.stdout_to_stderr = 1;
 269        argv_array_push(&rsync.args, "rsync");
 270        argv_array_push(&rsync.args, (transport->verbose > 1) ? "-rv" : "-r");
 271        argv_array_push(&rsync.args, "--ignore-existing");
 272        argv_array_push(&rsync.args, "--exclude");
 273        argv_array_push(&rsync.args, "info");
 274        argv_array_pushf(&rsync.args, "%s/objects/", rsync_url(transport->url));
 275        argv_array_push(&rsync.args, get_object_directory());
 276
 277        /* NEEDSWORK: handle one level of alternates */
 278        return run_command(&rsync);
 279}
 280
 281static int write_one_ref(const char *name, const unsigned char *sha1,
 282                int flags, void *data)
 283{
 284        struct strbuf *buf = data;
 285        int len = buf->len;
 286        FILE *f;
 287
 288        /* when called via for_each_ref(), flags is non-zero */
 289        if (flags && !starts_with(name, "refs/heads/") &&
 290                        !starts_with(name, "refs/tags/"))
 291                return 0;
 292
 293        strbuf_addstr(buf, name);
 294        if (safe_create_leading_directories(buf->buf) ||
 295                        !(f = fopen(buf->buf, "w")) ||
 296                        fprintf(f, "%s\n", sha1_to_hex(sha1)) < 0 ||
 297                        fclose(f))
 298                return error("problems writing temporary file %s", buf->buf);
 299        strbuf_setlen(buf, len);
 300        return 0;
 301}
 302
 303static int write_refs_to_temp_dir(struct strbuf *temp_dir,
 304                int refspec_nr, const char **refspec)
 305{
 306        int i;
 307
 308        for (i = 0; i < refspec_nr; i++) {
 309                unsigned char sha1[20];
 310                char *ref;
 311
 312                if (dwim_ref(refspec[i], strlen(refspec[i]), sha1, &ref) != 1)
 313                        return error("Could not get ref %s", refspec[i]);
 314
 315                if (write_one_ref(ref, sha1, 0, temp_dir)) {
 316                        free(ref);
 317                        return -1;
 318                }
 319                free(ref);
 320        }
 321        return 0;
 322}
 323
 324static int rsync_transport_push(struct transport *transport,
 325                int refspec_nr, const char **refspec, int flags)
 326{
 327        struct strbuf buf = STRBUF_INIT, temp_dir = STRBUF_INIT;
 328        int result = 0, i;
 329        struct child_process rsync = CHILD_PROCESS_INIT;
 330        const char *args[10];
 331
 332        if (flags & TRANSPORT_PUSH_MIRROR)
 333                return error("rsync transport does not support mirror mode");
 334
 335        /* first push the objects */
 336
 337        strbuf_addstr(&buf, rsync_url(transport->url));
 338        strbuf_addch(&buf, '/');
 339
 340        rsync.argv = args;
 341        rsync.stdout_to_stderr = 1;
 342        i = 0;
 343        args[i++] = "rsync";
 344        args[i++] = "-a";
 345        if (flags & TRANSPORT_PUSH_DRY_RUN)
 346                args[i++] = "--dry-run";
 347        if (transport->verbose > 1)
 348                args[i++] = "-v";
 349        args[i++] = "--ignore-existing";
 350        args[i++] = "--exclude";
 351        args[i++] = "info";
 352        args[i++] = get_object_directory();
 353        args[i++] = buf.buf;
 354        args[i++] = NULL;
 355
 356        if (run_command(&rsync))
 357                return error("Could not push objects to %s",
 358                                rsync_url(transport->url));
 359
 360        /* copy the refs to the temporary directory; they could be packed. */
 361
 362        strbuf_addstr(&temp_dir, git_path("rsync-refs-XXXXXX"));
 363        if (!mkdtemp(temp_dir.buf))
 364                die_errno ("Could not make temporary directory");
 365        strbuf_addch(&temp_dir, '/');
 366
 367        if (flags & TRANSPORT_PUSH_ALL) {
 368                if (for_each_ref(write_one_ref, &temp_dir))
 369                        return -1;
 370        } else if (write_refs_to_temp_dir(&temp_dir, refspec_nr, refspec))
 371                return -1;
 372
 373        i = 2;
 374        if (flags & TRANSPORT_PUSH_DRY_RUN)
 375                args[i++] = "--dry-run";
 376        if (!(flags & TRANSPORT_PUSH_FORCE))
 377                args[i++] = "--ignore-existing";
 378        args[i++] = temp_dir.buf;
 379        args[i++] = rsync_url(transport->url);
 380        args[i++] = NULL;
 381        if (run_command(&rsync))
 382                result = error("Could not push to %s",
 383                                rsync_url(transport->url));
 384
 385        if (remove_dir_recursively(&temp_dir, 0))
 386                warning ("Could not remove temporary directory %s.",
 387                                temp_dir.buf);
 388
 389        strbuf_release(&buf);
 390        strbuf_release(&temp_dir);
 391
 392        return result;
 393}
 394
 395struct bundle_transport_data {
 396        int fd;
 397        struct bundle_header header;
 398};
 399
 400static struct ref *get_refs_from_bundle(struct transport *transport, int for_push)
 401{
 402        struct bundle_transport_data *data = transport->data;
 403        struct ref *result = NULL;
 404        int i;
 405
 406        if (for_push)
 407                return NULL;
 408
 409        if (data->fd > 0)
 410                close(data->fd);
 411        data->fd = read_bundle_header(transport->url, &data->header);
 412        if (data->fd < 0)
 413                die ("Could not read bundle '%s'.", transport->url);
 414        for (i = 0; i < data->header.references.nr; i++) {
 415                struct ref_list_entry *e = data->header.references.list + i;
 416                struct ref *ref = alloc_ref(e->name);
 417                hashcpy(ref->old_sha1, e->sha1);
 418                ref->next = result;
 419                result = ref;
 420        }
 421        return result;
 422}
 423
 424static int fetch_refs_from_bundle(struct transport *transport,
 425                               int nr_heads, struct ref **to_fetch)
 426{
 427        struct bundle_transport_data *data = transport->data;
 428        return unbundle(&data->header, data->fd,
 429                        transport->progress ? BUNDLE_VERBOSE : 0);
 430}
 431
 432static int close_bundle(struct transport *transport)
 433{
 434        struct bundle_transport_data *data = transport->data;
 435        if (data->fd > 0)
 436                close(data->fd);
 437        free(data);
 438        return 0;
 439}
 440
 441struct git_transport_data {
 442        struct git_transport_options options;
 443        struct child_process *conn;
 444        int fd[2];
 445        unsigned got_remote_heads : 1;
 446        struct sha1_array extra_have;
 447        struct sha1_array shallow;
 448};
 449
 450static int set_git_option(struct git_transport_options *opts,
 451                          const char *name, const char *value)
 452{
 453        if (!strcmp(name, TRANS_OPT_UPLOADPACK)) {
 454                opts->uploadpack = value;
 455                return 0;
 456        } else if (!strcmp(name, TRANS_OPT_RECEIVEPACK)) {
 457                opts->receivepack = value;
 458                return 0;
 459        } else if (!strcmp(name, TRANS_OPT_THIN)) {
 460                opts->thin = !!value;
 461                return 0;
 462        } else if (!strcmp(name, TRANS_OPT_FOLLOWTAGS)) {
 463                opts->followtags = !!value;
 464                return 0;
 465        } else if (!strcmp(name, TRANS_OPT_KEEP)) {
 466                opts->keep = !!value;
 467                return 0;
 468        } else if (!strcmp(name, TRANS_OPT_UPDATE_SHALLOW)) {
 469                opts->update_shallow = !!value;
 470                return 0;
 471        } else if (!strcmp(name, TRANS_OPT_DEPTH)) {
 472                if (!value)
 473                        opts->depth = 0;
 474                else {
 475                        char *end;
 476                        opts->depth = strtol(value, &end, 0);
 477                        if (*end)
 478                                die("transport: invalid depth option '%s'", value);
 479                }
 480                return 0;
 481        } else if (!strcmp(name, TRANS_OPT_PUSH_CERT)) {
 482                opts->push_cert = !!value;
 483                return 0;
 484        }
 485        return 1;
 486}
 487
 488static int connect_setup(struct transport *transport, int for_push, int verbose)
 489{
 490        struct git_transport_data *data = transport->data;
 491
 492        if (data->conn)
 493                return 0;
 494
 495        data->conn = git_connect(data->fd, transport->url,
 496                                 for_push ? data->options.receivepack :
 497                                 data->options.uploadpack,
 498                                 verbose ? CONNECT_VERBOSE : 0);
 499
 500        return 0;
 501}
 502
 503static struct ref *get_refs_via_connect(struct transport *transport, int for_push)
 504{
 505        struct git_transport_data *data = transport->data;
 506        struct ref *refs;
 507
 508        connect_setup(transport, for_push, 0);
 509        get_remote_heads(data->fd[0], NULL, 0, &refs,
 510                         for_push ? REF_NORMAL : 0,
 511                         &data->extra_have,
 512                         &data->shallow);
 513        data->got_remote_heads = 1;
 514
 515        return refs;
 516}
 517
 518static int fetch_refs_via_pack(struct transport *transport,
 519                               int nr_heads, struct ref **to_fetch)
 520{
 521        struct git_transport_data *data = transport->data;
 522        struct ref *refs;
 523        char *dest = xstrdup(transport->url);
 524        struct fetch_pack_args args;
 525        struct ref *refs_tmp = NULL;
 526
 527        memset(&args, 0, sizeof(args));
 528        args.uploadpack = data->options.uploadpack;
 529        args.keep_pack = data->options.keep;
 530        args.lock_pack = 1;
 531        args.use_thin_pack = data->options.thin;
 532        args.include_tag = data->options.followtags;
 533        args.verbose = (transport->verbose > 1);
 534        args.quiet = (transport->verbose < 0);
 535        args.no_progress = !transport->progress;
 536        args.depth = data->options.depth;
 537        args.check_self_contained_and_connected =
 538                data->options.check_self_contained_and_connected;
 539        args.cloning = transport->cloning;
 540        args.update_shallow = data->options.update_shallow;
 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,
 545                                 NULL, &data->shallow);
 546                data->got_remote_heads = 1;
 547        }
 548
 549        refs = fetch_pack(&args, data->fd, data->conn,
 550                          refs_tmp ? refs_tmp : transport->remote_refs,
 551                          dest, to_fetch, nr_heads, &data->shallow,
 552                          &transport->pack_lockfile);
 553        close(data->fd[0]);
 554        close(data->fd[1]);
 555        if (finish_connect(data->conn)) {
 556                free_refs(refs);
 557                refs = NULL;
 558        }
 559        data->conn = NULL;
 560        data->got_remote_heads = 0;
 561        data->options.self_contained_and_connected =
 562                args.self_contained_and_connected;
 563
 564        free_refs(refs_tmp);
 565        free_refs(refs);
 566        free(dest);
 567        return (refs ? 0 : -1);
 568}
 569
 570static int push_had_errors(struct ref *ref)
 571{
 572        for (; ref; ref = ref->next) {
 573                switch (ref->status) {
 574                case REF_STATUS_NONE:
 575                case REF_STATUS_UPTODATE:
 576                case REF_STATUS_OK:
 577                        break;
 578                default:
 579                        return 1;
 580                }
 581        }
 582        return 0;
 583}
 584
 585int transport_refs_pushed(struct ref *ref)
 586{
 587        for (; ref; ref = ref->next) {
 588                switch(ref->status) {
 589                case REF_STATUS_NONE:
 590                case REF_STATUS_UPTODATE:
 591                        break;
 592                default:
 593                        return 1;
 594                }
 595        }
 596        return 0;
 597}
 598
 599void transport_update_tracking_ref(struct remote *remote, struct ref *ref, int verbose)
 600{
 601        struct refspec rs;
 602
 603        if (ref->status != REF_STATUS_OK && ref->status != REF_STATUS_UPTODATE)
 604                return;
 605
 606        rs.src = ref->name;
 607        rs.dst = NULL;
 608
 609        if (!remote_find_tracking(remote, &rs)) {
 610                if (verbose)
 611                        fprintf(stderr, "updating local tracking ref '%s'\n", rs.dst);
 612                if (ref->deletion) {
 613                        delete_ref(rs.dst, NULL, 0);
 614                } else
 615                        update_ref("update by push", rs.dst,
 616                                        ref->new_sha1, NULL, 0, 0);
 617                free(rs.dst);
 618        }
 619}
 620
 621static void print_ref_status(char flag, const char *summary, struct ref *to, struct ref *from, const char *msg, int porcelain)
 622{
 623        if (porcelain) {
 624                if (from)
 625                        fprintf(stdout, "%c\t%s:%s\t", flag, from->name, to->name);
 626                else
 627                        fprintf(stdout, "%c\t:%s\t", flag, to->name);
 628                if (msg)
 629                        fprintf(stdout, "%s (%s)\n", summary, msg);
 630                else
 631                        fprintf(stdout, "%s\n", summary);
 632        } else {
 633                fprintf(stderr, " %c %-*s ", flag, TRANSPORT_SUMMARY_WIDTH, summary);
 634                if (from)
 635                        fprintf(stderr, "%s -> %s", prettify_refname(from->name), prettify_refname(to->name));
 636                else
 637                        fputs(prettify_refname(to->name), stderr);
 638                if (msg) {
 639                        fputs(" (", stderr);
 640                        fputs(msg, stderr);
 641                        fputc(')', stderr);
 642                }
 643                fputc('\n', stderr);
 644        }
 645}
 646
 647static const char *status_abbrev(unsigned char sha1[20])
 648{
 649        return find_unique_abbrev(sha1, DEFAULT_ABBREV);
 650}
 651
 652static void print_ok_ref_status(struct ref *ref, int porcelain)
 653{
 654        if (ref->deletion)
 655                print_ref_status('-', "[deleted]", ref, NULL, NULL, porcelain);
 656        else if (is_null_sha1(ref->old_sha1))
 657                print_ref_status('*',
 658                        (starts_with(ref->name, "refs/tags/") ? "[new tag]" :
 659                        "[new branch]"),
 660                        ref, ref->peer_ref, NULL, porcelain);
 661        else {
 662                char quickref[84];
 663                char type;
 664                const char *msg;
 665
 666                strcpy(quickref, status_abbrev(ref->old_sha1));
 667                if (ref->forced_update) {
 668                        strcat(quickref, "...");
 669                        type = '+';
 670                        msg = "forced update";
 671                } else {
 672                        strcat(quickref, "..");
 673                        type = ' ';
 674                        msg = NULL;
 675                }
 676                strcat(quickref, status_abbrev(ref->new_sha1));
 677
 678                print_ref_status(type, quickref, ref, ref->peer_ref, msg, porcelain);
 679        }
 680}
 681
 682static int print_one_push_status(struct ref *ref, const char *dest, int count, int porcelain)
 683{
 684        if (!count) {
 685                char *url = transport_anonymize_url(dest);
 686                fprintf(porcelain ? stdout : stderr, "To %s\n", url);
 687                free(url);
 688        }
 689
 690        switch(ref->status) {
 691        case REF_STATUS_NONE:
 692                print_ref_status('X', "[no match]", ref, NULL, NULL, porcelain);
 693                break;
 694        case REF_STATUS_REJECT_NODELETE:
 695                print_ref_status('!', "[rejected]", ref, NULL,
 696                                                 "remote does not support deleting refs", porcelain);
 697                break;
 698        case REF_STATUS_UPTODATE:
 699                print_ref_status('=', "[up to date]", ref,
 700                                                 ref->peer_ref, NULL, porcelain);
 701                break;
 702        case REF_STATUS_REJECT_NONFASTFORWARD:
 703                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 704                                                 "non-fast-forward", porcelain);
 705                break;
 706        case REF_STATUS_REJECT_ALREADY_EXISTS:
 707                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 708                                                 "already exists", porcelain);
 709                break;
 710        case REF_STATUS_REJECT_FETCH_FIRST:
 711                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 712                                                 "fetch first", porcelain);
 713                break;
 714        case REF_STATUS_REJECT_NEEDS_FORCE:
 715                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 716                                                 "needs force", porcelain);
 717                break;
 718        case REF_STATUS_REJECT_STALE:
 719                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 720                                                 "stale info", porcelain);
 721                break;
 722        case REF_STATUS_REJECT_SHALLOW:
 723                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 724                                                 "new shallow roots not allowed", porcelain);
 725                break;
 726        case REF_STATUS_REMOTE_REJECT:
 727                print_ref_status('!', "[remote rejected]", ref,
 728                                                 ref->deletion ? NULL : ref->peer_ref,
 729                                                 ref->remote_status, porcelain);
 730                break;
 731        case REF_STATUS_EXPECTING_REPORT:
 732                print_ref_status('!', "[remote failure]", ref,
 733                                                 ref->deletion ? NULL : ref->peer_ref,
 734                                                 "remote failed to report status", porcelain);
 735                break;
 736        case REF_STATUS_ATOMIC_PUSH_FAILED:
 737                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 738                                                 "atomic push failed", porcelain);
 739                break;
 740        case REF_STATUS_OK:
 741                print_ok_ref_status(ref, porcelain);
 742                break;
 743        }
 744
 745        return 1;
 746}
 747
 748void transport_print_push_status(const char *dest, struct ref *refs,
 749                                  int verbose, int porcelain, unsigned int *reject_reasons)
 750{
 751        struct ref *ref;
 752        int n = 0;
 753        unsigned char head_sha1[20];
 754        char *head;
 755
 756        head = resolve_refdup("HEAD", RESOLVE_REF_READING, head_sha1, NULL);
 757
 758        if (verbose) {
 759                for (ref = refs; ref; ref = ref->next)
 760                        if (ref->status == REF_STATUS_UPTODATE)
 761                                n += print_one_push_status(ref, dest, n, porcelain);
 762        }
 763
 764        for (ref = refs; ref; ref = ref->next)
 765                if (ref->status == REF_STATUS_OK)
 766                        n += print_one_push_status(ref, dest, n, porcelain);
 767
 768        *reject_reasons = 0;
 769        for (ref = refs; ref; ref = ref->next) {
 770                if (ref->status != REF_STATUS_NONE &&
 771                    ref->status != REF_STATUS_UPTODATE &&
 772                    ref->status != REF_STATUS_OK)
 773                        n += print_one_push_status(ref, dest, n, porcelain);
 774                if (ref->status == REF_STATUS_REJECT_NONFASTFORWARD) {
 775                        if (head != NULL && !strcmp(head, ref->name))
 776                                *reject_reasons |= REJECT_NON_FF_HEAD;
 777                        else
 778                                *reject_reasons |= REJECT_NON_FF_OTHER;
 779                } else if (ref->status == REF_STATUS_REJECT_ALREADY_EXISTS) {
 780                        *reject_reasons |= REJECT_ALREADY_EXISTS;
 781                } else if (ref->status == REF_STATUS_REJECT_FETCH_FIRST) {
 782                        *reject_reasons |= REJECT_FETCH_FIRST;
 783                } else if (ref->status == REF_STATUS_REJECT_NEEDS_FORCE) {
 784                        *reject_reasons |= REJECT_NEEDS_FORCE;
 785                }
 786        }
 787        free(head);
 788}
 789
 790void transport_verify_remote_names(int nr_heads, const char **heads)
 791{
 792        int i;
 793
 794        for (i = 0; i < nr_heads; i++) {
 795                const char *local = heads[i];
 796                const char *remote = strrchr(heads[i], ':');
 797
 798                if (*local == '+')
 799                        local++;
 800
 801                /* A matching refspec is okay.  */
 802                if (remote == local && remote[1] == '\0')
 803                        continue;
 804
 805                remote = remote ? (remote + 1) : local;
 806                if (check_refname_format(remote,
 807                                REFNAME_ALLOW_ONELEVEL|REFNAME_REFSPEC_PATTERN))
 808                        die("remote part of refspec is not a valid name in %s",
 809                                heads[i]);
 810        }
 811}
 812
 813static int git_transport_push(struct transport *transport, struct ref *remote_refs, int flags)
 814{
 815        struct git_transport_data *data = transport->data;
 816        struct send_pack_args args;
 817        int ret;
 818
 819        if (!data->got_remote_heads) {
 820                struct ref *tmp_refs;
 821                connect_setup(transport, 1, 0);
 822
 823                get_remote_heads(data->fd[0], NULL, 0, &tmp_refs, REF_NORMAL,
 824                                 NULL, &data->shallow);
 825                data->got_remote_heads = 1;
 826        }
 827
 828        memset(&args, 0, sizeof(args));
 829        args.send_mirror = !!(flags & TRANSPORT_PUSH_MIRROR);
 830        args.force_update = !!(flags & TRANSPORT_PUSH_FORCE);
 831        args.use_thin_pack = data->options.thin;
 832        args.verbose = (transport->verbose > 0);
 833        args.quiet = (transport->verbose < 0);
 834        args.progress = transport->progress;
 835        args.dry_run = !!(flags & TRANSPORT_PUSH_DRY_RUN);
 836        args.porcelain = !!(flags & TRANSPORT_PUSH_PORCELAIN);
 837        args.push_cert = !!(flags & TRANSPORT_PUSH_CERT);
 838        args.atomic = !!(flags & TRANSPORT_PUSH_ATOMIC);
 839        args.url = transport->url;
 840
 841        ret = send_pack(&args, data->fd, data->conn, remote_refs,
 842                        &data->extra_have);
 843
 844        close(data->fd[1]);
 845        close(data->fd[0]);
 846        ret |= finish_connect(data->conn);
 847        data->conn = NULL;
 848        data->got_remote_heads = 0;
 849
 850        return ret;
 851}
 852
 853static int connect_git(struct transport *transport, const char *name,
 854                       const char *executable, int fd[2])
 855{
 856        struct git_transport_data *data = transport->data;
 857        data->conn = git_connect(data->fd, transport->url,
 858                                 executable, 0);
 859        fd[0] = data->fd[0];
 860        fd[1] = data->fd[1];
 861        return 0;
 862}
 863
 864static int disconnect_git(struct transport *transport)
 865{
 866        struct git_transport_data *data = transport->data;
 867        if (data->conn) {
 868                if (data->got_remote_heads)
 869                        packet_flush(data->fd[1]);
 870                close(data->fd[0]);
 871                close(data->fd[1]);
 872                finish_connect(data->conn);
 873        }
 874
 875        free(data);
 876        return 0;
 877}
 878
 879void transport_take_over(struct transport *transport,
 880                         struct child_process *child)
 881{
 882        struct git_transport_data *data;
 883
 884        if (!transport->smart_options)
 885                die("Bug detected: Taking over transport requires non-NULL "
 886                    "smart_options field.");
 887
 888        data = xcalloc(1, sizeof(*data));
 889        data->options = *transport->smart_options;
 890        data->conn = child;
 891        data->fd[0] = data->conn->out;
 892        data->fd[1] = data->conn->in;
 893        data->got_remote_heads = 0;
 894        transport->data = data;
 895
 896        transport->set_option = NULL;
 897        transport->get_refs_list = get_refs_via_connect;
 898        transport->fetch = fetch_refs_via_pack;
 899        transport->push = NULL;
 900        transport->push_refs = git_transport_push;
 901        transport->disconnect = disconnect_git;
 902        transport->smart_options = &(data->options);
 903
 904        transport->cannot_reuse = 1;
 905}
 906
 907static int is_file(const char *url)
 908{
 909        struct stat buf;
 910        if (stat(url, &buf))
 911                return 0;
 912        return S_ISREG(buf.st_mode);
 913}
 914
 915static int external_specification_len(const char *url)
 916{
 917        return strchr(url, ':') - url;
 918}
 919
 920static const struct string_list *protocol_whitelist(void)
 921{
 922        static int enabled = -1;
 923        static struct string_list allowed = STRING_LIST_INIT_DUP;
 924
 925        if (enabled < 0) {
 926                const char *v = getenv("GIT_ALLOW_PROTOCOL");
 927                if (v) {
 928                        string_list_split(&allowed, v, ':', -1);
 929                        string_list_sort(&allowed);
 930                        enabled = 1;
 931                } else {
 932                        enabled = 0;
 933                }
 934        }
 935
 936        return enabled ? &allowed : NULL;
 937}
 938
 939int is_transport_allowed(const char *type)
 940{
 941        const struct string_list *allowed = protocol_whitelist();
 942        return !allowed || string_list_has_string(allowed, type);
 943}
 944
 945void transport_check_allowed(const char *type)
 946{
 947        if (!is_transport_allowed(type))
 948                die("transport '%s' not allowed", type);
 949}
 950
 951int transport_restrict_protocols(void)
 952{
 953        return !!protocol_whitelist();
 954}
 955
 956struct transport *transport_get(struct remote *remote, const char *url)
 957{
 958        const char *helper;
 959        struct transport *ret = xcalloc(1, sizeof(*ret));
 960
 961        ret->progress = isatty(2);
 962
 963        if (!remote)
 964                die("No remote provided to transport_get()");
 965
 966        ret->got_remote_refs = 0;
 967        ret->remote = remote;
 968        helper = remote->foreign_vcs;
 969
 970        if (!url && remote->url)
 971                url = remote->url[0];
 972        ret->url = url;
 973
 974        /* maybe it is a foreign URL? */
 975        if (url) {
 976                const char *p = url;
 977
 978                while (is_urlschemechar(p == url, *p))
 979                        p++;
 980                if (starts_with(p, "::"))
 981                        helper = xstrndup(url, p - url);
 982        }
 983
 984        if (helper) {
 985                transport_helper_init(ret, helper);
 986        } else if (starts_with(url, "rsync:")) {
 987                transport_check_allowed("rsync");
 988                ret->get_refs_list = get_refs_via_rsync;
 989                ret->fetch = fetch_objs_via_rsync;
 990                ret->push = rsync_transport_push;
 991                ret->smart_options = NULL;
 992        } else if (url_is_local_not_ssh(url) && is_file(url) && is_bundle(url, 1)) {
 993                struct bundle_transport_data *data = xcalloc(1, sizeof(*data));
 994                transport_check_allowed("file");
 995                ret->data = data;
 996                ret->get_refs_list = get_refs_from_bundle;
 997                ret->fetch = fetch_refs_from_bundle;
 998                ret->disconnect = close_bundle;
 999                ret->smart_options = NULL;
1000        } else if (!is_url(url)
1001                || starts_with(url, "file://")
1002                || starts_with(url, "git://")
1003                || starts_with(url, "ssh://")
1004                || starts_with(url, "git+ssh://")
1005                || starts_with(url, "ssh+git://")) {
1006                /*
1007                 * These are builtin smart transports; "allowed" transports
1008                 * will be checked individually in git_connect.
1009                 */
1010                struct git_transport_data *data = xcalloc(1, sizeof(*data));
1011                ret->data = data;
1012                ret->set_option = NULL;
1013                ret->get_refs_list = get_refs_via_connect;
1014                ret->fetch = fetch_refs_via_pack;
1015                ret->push_refs = git_transport_push;
1016                ret->connect = connect_git;
1017                ret->disconnect = disconnect_git;
1018                ret->smart_options = &(data->options);
1019
1020                data->conn = NULL;
1021                data->got_remote_heads = 0;
1022        } else {
1023                /* Unknown protocol in URL. Pass to external handler. */
1024                int len = external_specification_len(url);
1025                char *handler = xmemdupz(url, len);
1026                transport_helper_init(ret, handler);
1027        }
1028
1029        if (ret->smart_options) {
1030                ret->smart_options->thin = 1;
1031                ret->smart_options->uploadpack = "git-upload-pack";
1032                if (remote->uploadpack)
1033                        ret->smart_options->uploadpack = remote->uploadpack;
1034                ret->smart_options->receivepack = "git-receive-pack";
1035                if (remote->receivepack)
1036                        ret->smart_options->receivepack = remote->receivepack;
1037        }
1038
1039        return ret;
1040}
1041
1042int transport_set_option(struct transport *transport,
1043                         const char *name, const char *value)
1044{
1045        int git_reports = 1, protocol_reports = 1;
1046
1047        if (transport->smart_options)
1048                git_reports = set_git_option(transport->smart_options,
1049                                             name, value);
1050
1051        if (transport->set_option)
1052                protocol_reports = transport->set_option(transport, name,
1053                                                        value);
1054
1055        /* If either report is 0, report 0 (success). */
1056        if (!git_reports || !protocol_reports)
1057                return 0;
1058        /* If either reports -1 (invalid value), report -1. */
1059        if ((git_reports == -1) || (protocol_reports == -1))
1060                return -1;
1061        /* Otherwise if both report unknown, report unknown. */
1062        return 1;
1063}
1064
1065void transport_set_verbosity(struct transport *transport, int verbosity,
1066        int force_progress)
1067{
1068        if (verbosity >= 1)
1069                transport->verbose = verbosity <= 3 ? verbosity : 3;
1070        if (verbosity < 0)
1071                transport->verbose = -1;
1072
1073        /**
1074         * Rules used to determine whether to report progress (processing aborts
1075         * when a rule is satisfied):
1076         *
1077         *   . Report progress, if force_progress is 1 (ie. --progress).
1078         *   . Don't report progress, if force_progress is 0 (ie. --no-progress).
1079         *   . Don't report progress, if verbosity < 0 (ie. -q/--quiet ).
1080         *   . Report progress if isatty(2) is 1.
1081         **/
1082        if (force_progress >= 0)
1083                transport->progress = !!force_progress;
1084        else
1085                transport->progress = verbosity >= 0 && isatty(2);
1086}
1087
1088static void die_with_unpushed_submodules(struct string_list *needs_pushing)
1089{
1090        int i;
1091
1092        fprintf(stderr, "The following submodule paths contain changes that can\n"
1093                        "not be found on any remote:\n");
1094        for (i = 0; i < needs_pushing->nr; i++)
1095                printf("  %s\n", needs_pushing->items[i].string);
1096        fprintf(stderr, "\nPlease try\n\n"
1097                        "       git push --recurse-submodules=on-demand\n\n"
1098                        "or cd to the path and use\n\n"
1099                        "       git push\n\n"
1100                        "to push them to a remote.\n\n");
1101
1102        string_list_clear(needs_pushing, 0);
1103
1104        die("Aborting.");
1105}
1106
1107static int run_pre_push_hook(struct transport *transport,
1108                             struct ref *remote_refs)
1109{
1110        int ret = 0, x;
1111        struct ref *r;
1112        struct child_process proc = CHILD_PROCESS_INIT;
1113        struct strbuf buf;
1114        const char *argv[4];
1115
1116        if (!(argv[0] = find_hook("pre-push")))
1117                return 0;
1118
1119        argv[1] = transport->remote->name;
1120        argv[2] = transport->url;
1121        argv[3] = NULL;
1122
1123        proc.argv = argv;
1124        proc.in = -1;
1125
1126        if (start_command(&proc)) {
1127                finish_command(&proc);
1128                return -1;
1129        }
1130
1131        strbuf_init(&buf, 256);
1132
1133        for (r = remote_refs; r; r = r->next) {
1134                if (!r->peer_ref) continue;
1135                if (r->status == REF_STATUS_REJECT_NONFASTFORWARD) continue;
1136                if (r->status == REF_STATUS_REJECT_STALE) continue;
1137                if (r->status == REF_STATUS_UPTODATE) continue;
1138
1139                strbuf_reset(&buf);
1140                strbuf_addf( &buf, "%s %s %s %s\n",
1141                         r->peer_ref->name, sha1_to_hex(r->new_sha1),
1142                         r->name, sha1_to_hex(r->old_sha1));
1143
1144                if (write_in_full(proc.in, buf.buf, buf.len) != buf.len) {
1145                        ret = -1;
1146                        break;
1147                }
1148        }
1149
1150        strbuf_release(&buf);
1151
1152        x = close(proc.in);
1153        if (!ret)
1154                ret = x;
1155
1156        x = finish_command(&proc);
1157        if (!ret)
1158                ret = x;
1159
1160        return ret;
1161}
1162
1163int transport_push(struct transport *transport,
1164                   int refspec_nr, const char **refspec, int flags,
1165                   unsigned int *reject_reasons)
1166{
1167        *reject_reasons = 0;
1168        transport_verify_remote_names(refspec_nr, refspec);
1169
1170        if (transport->push) {
1171                /* Maybe FIXME. But no important transport uses this case. */
1172                if (flags & TRANSPORT_PUSH_SET_UPSTREAM)
1173                        die("This transport does not support using --set-upstream");
1174
1175                return transport->push(transport, refspec_nr, refspec, flags);
1176        } else if (transport->push_refs) {
1177                struct ref *remote_refs;
1178                struct ref *local_refs = get_local_heads();
1179                int match_flags = MATCH_REFS_NONE;
1180                int verbose = (transport->verbose > 0);
1181                int quiet = (transport->verbose < 0);
1182                int porcelain = flags & TRANSPORT_PUSH_PORCELAIN;
1183                int pretend = flags & TRANSPORT_PUSH_DRY_RUN;
1184                int push_ret, ret, err;
1185
1186                if (check_push_refs(local_refs, refspec_nr, refspec) < 0)
1187                        return -1;
1188
1189                remote_refs = transport->get_refs_list(transport, 1);
1190
1191                if (flags & TRANSPORT_PUSH_ALL)
1192                        match_flags |= MATCH_REFS_ALL;
1193                if (flags & TRANSPORT_PUSH_MIRROR)
1194                        match_flags |= MATCH_REFS_MIRROR;
1195                if (flags & TRANSPORT_PUSH_PRUNE)
1196                        match_flags |= MATCH_REFS_PRUNE;
1197                if (flags & TRANSPORT_PUSH_FOLLOW_TAGS)
1198                        match_flags |= MATCH_REFS_FOLLOW_TAGS;
1199
1200                if (match_push_refs(local_refs, &remote_refs,
1201                                    refspec_nr, refspec, match_flags)) {
1202                        return -1;
1203                }
1204
1205                if (transport->smart_options &&
1206                    transport->smart_options->cas &&
1207                    !is_empty_cas(transport->smart_options->cas))
1208                        apply_push_cas(transport->smart_options->cas,
1209                                       transport->remote, remote_refs);
1210
1211                set_ref_status_for_push(remote_refs,
1212                        flags & TRANSPORT_PUSH_MIRROR,
1213                        flags & TRANSPORT_PUSH_FORCE);
1214
1215                if (!(flags & TRANSPORT_PUSH_NO_HOOK))
1216                        if (run_pre_push_hook(transport, remote_refs))
1217                                return -1;
1218
1219                if ((flags & TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND) && !is_bare_repository()) {
1220                        struct ref *ref = remote_refs;
1221                        for (; ref; ref = ref->next)
1222                                if (!is_null_sha1(ref->new_sha1) &&
1223                                    !push_unpushed_submodules(ref->new_sha1,
1224                                            transport->remote->name))
1225                                    die ("Failed to push all needed submodules!");
1226                }
1227
1228                if ((flags & (TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND |
1229                              TRANSPORT_RECURSE_SUBMODULES_CHECK)) && !is_bare_repository()) {
1230                        struct ref *ref = remote_refs;
1231                        struct string_list needs_pushing = STRING_LIST_INIT_DUP;
1232
1233                        for (; ref; ref = ref->next)
1234                                if (!is_null_sha1(ref->new_sha1) &&
1235                                    find_unpushed_submodules(ref->new_sha1,
1236                                            transport->remote->name, &needs_pushing))
1237                                        die_with_unpushed_submodules(&needs_pushing);
1238                }
1239
1240                push_ret = transport->push_refs(transport, remote_refs, flags);
1241                err = push_had_errors(remote_refs);
1242                ret = push_ret | err;
1243
1244                if (!quiet || err)
1245                        transport_print_push_status(transport->url, remote_refs,
1246                                        verbose | porcelain, porcelain,
1247                                        reject_reasons);
1248
1249                if (flags & TRANSPORT_PUSH_SET_UPSTREAM)
1250                        set_upstreams(transport, remote_refs, pretend);
1251
1252                if (!(flags & TRANSPORT_PUSH_DRY_RUN)) {
1253                        struct ref *ref;
1254                        for (ref = remote_refs; ref; ref = ref->next)
1255                                transport_update_tracking_ref(transport->remote, ref, verbose);
1256                }
1257
1258                if (porcelain && !push_ret)
1259                        puts("Done");
1260                else if (!quiet && !ret && !transport_refs_pushed(remote_refs))
1261                        fprintf(stderr, "Everything up-to-date\n");
1262
1263                return ret;
1264        }
1265        return 1;
1266}
1267
1268const struct ref *transport_get_remote_refs(struct transport *transport)
1269{
1270        if (!transport->got_remote_refs) {
1271                transport->remote_refs = transport->get_refs_list(transport, 0);
1272                transport->got_remote_refs = 1;
1273        }
1274
1275        return transport->remote_refs;
1276}
1277
1278int transport_fetch_refs(struct transport *transport, struct ref *refs)
1279{
1280        int rc;
1281        int nr_heads = 0, nr_alloc = 0, nr_refs = 0;
1282        struct ref **heads = NULL;
1283        struct ref *rm;
1284
1285        for (rm = refs; rm; rm = rm->next) {
1286                nr_refs++;
1287                if (rm->peer_ref &&
1288                    !is_null_sha1(rm->old_sha1) &&
1289                    !hashcmp(rm->peer_ref->old_sha1, rm->old_sha1))
1290                        continue;
1291                ALLOC_GROW(heads, nr_heads + 1, nr_alloc);
1292                heads[nr_heads++] = rm;
1293        }
1294
1295        if (!nr_heads) {
1296                /*
1297                 * When deepening of a shallow repository is requested,
1298                 * then local and remote refs are likely to still be equal.
1299                 * Just feed them all to the fetch method in that case.
1300                 * This condition shouldn't be met in a non-deepening fetch
1301                 * (see builtin/fetch.c:quickfetch()).
1302                 */
1303                heads = xmalloc(nr_refs * sizeof(*heads));
1304                for (rm = refs; rm; rm = rm->next)
1305                        heads[nr_heads++] = rm;
1306        }
1307
1308        rc = transport->fetch(transport, nr_heads, heads);
1309
1310        free(heads);
1311        return rc;
1312}
1313
1314void transport_unlock_pack(struct transport *transport)
1315{
1316        if (transport->pack_lockfile) {
1317                unlink_or_warn(transport->pack_lockfile);
1318                free(transport->pack_lockfile);
1319                transport->pack_lockfile = NULL;
1320        }
1321}
1322
1323int transport_connect(struct transport *transport, const char *name,
1324                      const char *exec, int fd[2])
1325{
1326        if (transport->connect)
1327                return transport->connect(transport, name, exec, fd);
1328        else
1329                die("Operation not supported by protocol");
1330}
1331
1332int transport_disconnect(struct transport *transport)
1333{
1334        int ret = 0;
1335        if (transport->disconnect)
1336                ret = transport->disconnect(transport);
1337        free(transport);
1338        return ret;
1339}
1340
1341/*
1342 * Strip username (and password) from a URL and return
1343 * it in a newly allocated string.
1344 */
1345char *transport_anonymize_url(const char *url)
1346{
1347        char *anon_url, *scheme_prefix, *anon_part;
1348        size_t anon_len, prefix_len = 0;
1349
1350        anon_part = strchr(url, '@');
1351        if (url_is_local_not_ssh(url) || !anon_part)
1352                goto literal_copy;
1353
1354        anon_len = strlen(++anon_part);
1355        scheme_prefix = strstr(url, "://");
1356        if (!scheme_prefix) {
1357                if (!strchr(anon_part, ':'))
1358                        /* cannot be "me@there:/path/name" */
1359                        goto literal_copy;
1360        } else {
1361                const char *cp;
1362                /* make sure scheme is reasonable */
1363                for (cp = url; cp < scheme_prefix; cp++) {
1364                        switch (*cp) {
1365                                /* RFC 1738 2.1 */
1366                        case '+': case '.': case '-':
1367                                break; /* ok */
1368                        default:
1369                                if (isalnum(*cp))
1370                                        break;
1371                                /* it isn't */
1372                                goto literal_copy;
1373                        }
1374                }
1375                /* @ past the first slash does not count */
1376                cp = strchr(scheme_prefix + 3, '/');
1377                if (cp && cp < anon_part)
1378                        goto literal_copy;
1379                prefix_len = scheme_prefix - url + 3;
1380        }
1381        anon_url = xcalloc(1, 1 + prefix_len + anon_len);
1382        memcpy(anon_url, url, prefix_len);
1383        memcpy(anon_url + prefix_len, anon_part, anon_len);
1384        return anon_url;
1385literal_copy:
1386        return xstrdup(url);
1387}
1388
1389struct alternate_refs_data {
1390        alternate_ref_fn *fn;
1391        void *data;
1392};
1393
1394static int refs_from_alternate_cb(struct alternate_object_database *e,
1395                                  void *data)
1396{
1397        char *other;
1398        size_t len;
1399        struct remote *remote;
1400        struct transport *transport;
1401        const struct ref *extra;
1402        struct alternate_refs_data *cb = data;
1403
1404        e->name[-1] = '\0';
1405        other = xstrdup(real_path(e->base));
1406        e->name[-1] = '/';
1407        len = strlen(other);
1408
1409        while (other[len-1] == '/')
1410                other[--len] = '\0';
1411        if (len < 8 || memcmp(other + len - 8, "/objects", 8))
1412                goto out;
1413        /* Is this a git repository with refs? */
1414        memcpy(other + len - 8, "/refs", 6);
1415        if (!is_directory(other))
1416                goto out;
1417        other[len - 8] = '\0';
1418        remote = remote_get(other);
1419        transport = transport_get(remote, other);
1420        for (extra = transport_get_remote_refs(transport);
1421             extra;
1422             extra = extra->next)
1423                cb->fn(extra, cb->data);
1424        transport_disconnect(transport);
1425out:
1426        free(other);
1427        return 0;
1428}
1429
1430void for_each_alternate_ref(alternate_ref_fn fn, void *data)
1431{
1432        struct alternate_refs_data cb;
1433        cb.fn = fn;
1434        cb.data = data;
1435        foreach_alt_odb(refs_from_alternate_cb, &cb);
1436}