Andrew's git / gitweb.git / transport.c
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transport.con commit chainlint: fix for core.autocrlf=true (1ce2b45)
   1#include "cache.h"
   2#include "config.h"
   3#include "transport.h"
   4#include "run-command.h"
   5#include "pkt-line.h"
   6#include "fetch-pack.h"
   7#include "remote.h"
   8#include "connect.h"
   9#include "send-pack.h"
  10#include "walker.h"
  11#include "bundle.h"
  12#include "dir.h"
  13#include "refs.h"
  14#include "refspec.h"
  15#include "branch.h"
  16#include "url.h"
  17#include "submodule.h"
  18#include "string-list.h"
  19#include "sha1-array.h"
  20#include "sigchain.h"
  21#include "transport-internal.h"
  22#include "protocol.h"
  23#include "object-store.h"
  24#include "color.h"
  25
  26static int transport_use_color = -1;
  27static char transport_colors[][COLOR_MAXLEN] = {
  28        GIT_COLOR_RESET,
  29        GIT_COLOR_RED           /* REJECTED */
  30};
  31
  32enum color_transport {
  33        TRANSPORT_COLOR_RESET = 0,
  34        TRANSPORT_COLOR_REJECTED = 1
  35};
  36
  37static int transport_color_config(void)
  38{
  39        const char *keys[] = {
  40                "color.transport.reset",
  41                "color.transport.rejected"
  42        }, *key = "color.transport";
  43        char *value;
  44        int i;
  45        static int initialized;
  46
  47        if (initialized)
  48                return 0;
  49        initialized = 1;
  50
  51        if (!git_config_get_string(key, &value))
  52                transport_use_color = git_config_colorbool(key, value);
  53
  54        if (!want_color_stderr(transport_use_color))
  55                return 0;
  56
  57        for (i = 0; i < ARRAY_SIZE(keys); i++)
  58                if (!git_config_get_string(keys[i], &value)) {
  59                        if (!value)
  60                                return config_error_nonbool(keys[i]);
  61                        if (color_parse(value, transport_colors[i]) < 0)
  62                                return -1;
  63                }
  64
  65        return 0;
  66}
  67
  68static const char *transport_get_color(enum color_transport ix)
  69{
  70        if (want_color_stderr(transport_use_color))
  71                return transport_colors[ix];
  72        return "";
  73}
  74
  75static void set_upstreams(struct transport *transport, struct ref *refs,
  76        int pretend)
  77{
  78        struct ref *ref;
  79        for (ref = refs; ref; ref = ref->next) {
  80                const char *localname;
  81                const char *tmp;
  82                const char *remotename;
  83                int flag = 0;
  84                /*
  85                 * Check suitability for tracking. Must be successful /
  86                 * already up-to-date ref create/modify (not delete).
  87                 */
  88                if (ref->status != REF_STATUS_OK &&
  89                        ref->status != REF_STATUS_UPTODATE)
  90                        continue;
  91                if (!ref->peer_ref)
  92                        continue;
  93                if (is_null_oid(&ref->new_oid))
  94                        continue;
  95
  96                /* Follow symbolic refs (mainly for HEAD). */
  97                localname = ref->peer_ref->name;
  98                remotename = ref->name;
  99                tmp = resolve_ref_unsafe(localname, RESOLVE_REF_READING,
 100                                         NULL, &flag);
 101                if (tmp && flag & REF_ISSYMREF &&
 102                        starts_with(tmp, "refs/heads/"))
 103                        localname = tmp;
 104
 105                /* Both source and destination must be local branches. */
 106                if (!localname || !starts_with(localname, "refs/heads/"))
 107                        continue;
 108                if (!remotename || !starts_with(remotename, "refs/heads/"))
 109                        continue;
 110
 111                if (!pretend)
 112                        install_branch_config(BRANCH_CONFIG_VERBOSE,
 113                                localname + 11, transport->remote->name,
 114                                remotename);
 115                else
 116                        printf(_("Would set upstream of '%s' to '%s' of '%s'\n"),
 117                                localname + 11, remotename + 11,
 118                                transport->remote->name);
 119        }
 120}
 121
 122struct bundle_transport_data {
 123        int fd;
 124        struct bundle_header header;
 125};
 126
 127static struct ref *get_refs_from_bundle(struct transport *transport,
 128                                        int for_push,
 129                                        const struct argv_array *ref_prefixes)
 130{
 131        struct bundle_transport_data *data = transport->data;
 132        struct ref *result = NULL;
 133        int i;
 134
 135        if (for_push)
 136                return NULL;
 137
 138        if (data->fd > 0)
 139                close(data->fd);
 140        data->fd = read_bundle_header(transport->url, &data->header);
 141        if (data->fd < 0)
 142                die ("Could not read bundle '%s'.", transport->url);
 143        for (i = 0; i < data->header.references.nr; i++) {
 144                struct ref_list_entry *e = data->header.references.list + i;
 145                struct ref *ref = alloc_ref(e->name);
 146                oidcpy(&ref->old_oid, &e->oid);
 147                ref->next = result;
 148                result = ref;
 149        }
 150        return result;
 151}
 152
 153static int fetch_refs_from_bundle(struct transport *transport,
 154                               int nr_heads, struct ref **to_fetch)
 155{
 156        struct bundle_transport_data *data = transport->data;
 157        return unbundle(&data->header, data->fd,
 158                        transport->progress ? BUNDLE_VERBOSE : 0);
 159}
 160
 161static int close_bundle(struct transport *transport)
 162{
 163        struct bundle_transport_data *data = transport->data;
 164        if (data->fd > 0)
 165                close(data->fd);
 166        free(data);
 167        return 0;
 168}
 169
 170struct git_transport_data {
 171        struct git_transport_options options;
 172        struct child_process *conn;
 173        int fd[2];
 174        unsigned got_remote_heads : 1;
 175        enum protocol_version version;
 176        struct oid_array extra_have;
 177        struct oid_array shallow;
 178};
 179
 180static int set_git_option(struct git_transport_options *opts,
 181                          const char *name, const char *value)
 182{
 183        if (!strcmp(name, TRANS_OPT_UPLOADPACK)) {
 184                opts->uploadpack = value;
 185                return 0;
 186        } else if (!strcmp(name, TRANS_OPT_RECEIVEPACK)) {
 187                opts->receivepack = value;
 188                return 0;
 189        } else if (!strcmp(name, TRANS_OPT_THIN)) {
 190                opts->thin = !!value;
 191                return 0;
 192        } else if (!strcmp(name, TRANS_OPT_FOLLOWTAGS)) {
 193                opts->followtags = !!value;
 194                return 0;
 195        } else if (!strcmp(name, TRANS_OPT_KEEP)) {
 196                opts->keep = !!value;
 197                return 0;
 198        } else if (!strcmp(name, TRANS_OPT_UPDATE_SHALLOW)) {
 199                opts->update_shallow = !!value;
 200                return 0;
 201        } else if (!strcmp(name, TRANS_OPT_DEPTH)) {
 202                if (!value)
 203                        opts->depth = 0;
 204                else {
 205                        char *end;
 206                        opts->depth = strtol(value, &end, 0);
 207                        if (*end)
 208                                die(_("transport: invalid depth option '%s'"), value);
 209                }
 210                return 0;
 211        } else if (!strcmp(name, TRANS_OPT_DEEPEN_SINCE)) {
 212                opts->deepen_since = value;
 213                return 0;
 214        } else if (!strcmp(name, TRANS_OPT_DEEPEN_NOT)) {
 215                opts->deepen_not = (const struct string_list *)value;
 216                return 0;
 217        } else if (!strcmp(name, TRANS_OPT_DEEPEN_RELATIVE)) {
 218                opts->deepen_relative = !!value;
 219                return 0;
 220        } else if (!strcmp(name, TRANS_OPT_FROM_PROMISOR)) {
 221                opts->from_promisor = !!value;
 222                return 0;
 223        } else if (!strcmp(name, TRANS_OPT_NO_DEPENDENTS)) {
 224                opts->no_dependents = !!value;
 225                return 0;
 226        } else if (!strcmp(name, TRANS_OPT_LIST_OBJECTS_FILTER)) {
 227                parse_list_objects_filter(&opts->filter_options, value);
 228                return 0;
 229        }
 230        return 1;
 231}
 232
 233static int connect_setup(struct transport *transport, int for_push)
 234{
 235        struct git_transport_data *data = transport->data;
 236        int flags = transport->verbose > 0 ? CONNECT_VERBOSE : 0;
 237
 238        if (data->conn)
 239                return 0;
 240
 241        switch (transport->family) {
 242        case TRANSPORT_FAMILY_ALL: break;
 243        case TRANSPORT_FAMILY_IPV4: flags |= CONNECT_IPV4; break;
 244        case TRANSPORT_FAMILY_IPV6: flags |= CONNECT_IPV6; break;
 245        }
 246
 247        data->conn = git_connect(data->fd, transport->url,
 248                                 for_push ? data->options.receivepack :
 249                                 data->options.uploadpack,
 250                                 flags);
 251
 252        return 0;
 253}
 254
 255static struct ref *get_refs_via_connect(struct transport *transport, int for_push,
 256                                        const struct argv_array *ref_prefixes)
 257{
 258        struct git_transport_data *data = transport->data;
 259        struct ref *refs = NULL;
 260        struct packet_reader reader;
 261
 262        connect_setup(transport, for_push);
 263
 264        packet_reader_init(&reader, data->fd[0], NULL, 0,
 265                           PACKET_READ_CHOMP_NEWLINE |
 266                           PACKET_READ_GENTLE_ON_EOF);
 267
 268        data->version = discover_version(&reader);
 269        switch (data->version) {
 270        case protocol_v2:
 271                get_remote_refs(data->fd[1], &reader, &refs, for_push,
 272                                ref_prefixes, transport->server_options);
 273                break;
 274        case protocol_v1:
 275        case protocol_v0:
 276                get_remote_heads(&reader, &refs,
 277                                 for_push ? REF_NORMAL : 0,
 278                                 &data->extra_have,
 279                                 &data->shallow);
 280                break;
 281        case protocol_unknown_version:
 282                BUG("unknown protocol version");
 283        }
 284        data->got_remote_heads = 1;
 285
 286        return refs;
 287}
 288
 289static int fetch_refs_via_pack(struct transport *transport,
 290                               int nr_heads, struct ref **to_fetch)
 291{
 292        int ret = 0;
 293        struct git_transport_data *data = transport->data;
 294        struct ref *refs = NULL;
 295        char *dest = xstrdup(transport->url);
 296        struct fetch_pack_args args;
 297        struct ref *refs_tmp = NULL;
 298
 299        memset(&args, 0, sizeof(args));
 300        args.uploadpack = data->options.uploadpack;
 301        args.keep_pack = data->options.keep;
 302        args.lock_pack = 1;
 303        args.use_thin_pack = data->options.thin;
 304        args.include_tag = data->options.followtags;
 305        args.verbose = (transport->verbose > 1);
 306        args.quiet = (transport->verbose < 0);
 307        args.no_progress = !transport->progress;
 308        args.depth = data->options.depth;
 309        args.deepen_since = data->options.deepen_since;
 310        args.deepen_not = data->options.deepen_not;
 311        args.deepen_relative = data->options.deepen_relative;
 312        args.check_self_contained_and_connected =
 313                data->options.check_self_contained_and_connected;
 314        args.cloning = transport->cloning;
 315        args.update_shallow = data->options.update_shallow;
 316        args.from_promisor = data->options.from_promisor;
 317        args.no_dependents = data->options.no_dependents;
 318        args.filter_options = data->options.filter_options;
 319        args.stateless_rpc = transport->stateless_rpc;
 320        args.server_options = transport->server_options;
 321
 322        if (!data->got_remote_heads)
 323                refs_tmp = get_refs_via_connect(transport, 0, NULL);
 324
 325        switch (data->version) {
 326        case protocol_v2:
 327                refs = fetch_pack(&args, data->fd, data->conn,
 328                                  refs_tmp ? refs_tmp : transport->remote_refs,
 329                                  dest, to_fetch, nr_heads, &data->shallow,
 330                                  &transport->pack_lockfile, data->version);
 331                break;
 332        case protocol_v1:
 333        case protocol_v0:
 334                refs = fetch_pack(&args, data->fd, data->conn,
 335                                  refs_tmp ? refs_tmp : transport->remote_refs,
 336                                  dest, to_fetch, nr_heads, &data->shallow,
 337                                  &transport->pack_lockfile, data->version);
 338                break;
 339        case protocol_unknown_version:
 340                BUG("unknown protocol version");
 341        }
 342
 343        close(data->fd[0]);
 344        close(data->fd[1]);
 345        if (finish_connect(data->conn))
 346                ret = -1;
 347        data->conn = NULL;
 348        data->got_remote_heads = 0;
 349        data->options.self_contained_and_connected =
 350                args.self_contained_and_connected;
 351
 352        if (refs == NULL)
 353                ret = -1;
 354        if (report_unmatched_refs(to_fetch, nr_heads))
 355                ret = -1;
 356
 357        free_refs(refs_tmp);
 358        free_refs(refs);
 359        free(dest);
 360        return ret;
 361}
 362
 363static int push_had_errors(struct ref *ref)
 364{
 365        for (; ref; ref = ref->next) {
 366                switch (ref->status) {
 367                case REF_STATUS_NONE:
 368                case REF_STATUS_UPTODATE:
 369                case REF_STATUS_OK:
 370                        break;
 371                default:
 372                        return 1;
 373                }
 374        }
 375        return 0;
 376}
 377
 378int transport_refs_pushed(struct ref *ref)
 379{
 380        for (; ref; ref = ref->next) {
 381                switch(ref->status) {
 382                case REF_STATUS_NONE:
 383                case REF_STATUS_UPTODATE:
 384                        break;
 385                default:
 386                        return 1;
 387                }
 388        }
 389        return 0;
 390}
 391
 392void transport_update_tracking_ref(struct remote *remote, struct ref *ref, int verbose)
 393{
 394        struct refspec_item rs;
 395
 396        if (ref->status != REF_STATUS_OK && ref->status != REF_STATUS_UPTODATE)
 397                return;
 398
 399        rs.src = ref->name;
 400        rs.dst = NULL;
 401
 402        if (!remote_find_tracking(remote, &rs)) {
 403                if (verbose)
 404                        fprintf(stderr, "updating local tracking ref '%s'\n", rs.dst);
 405                if (ref->deletion) {
 406                        delete_ref(NULL, rs.dst, NULL, 0);
 407                } else
 408                        update_ref("update by push", rs.dst, &ref->new_oid,
 409                                   NULL, 0, 0);
 410                free(rs.dst);
 411        }
 412}
 413
 414static void print_ref_status(char flag, const char *summary,
 415                             struct ref *to, struct ref *from, const char *msg,
 416                             int porcelain, int summary_width)
 417{
 418        if (porcelain) {
 419                if (from)
 420                        fprintf(stdout, "%c\t%s:%s\t", flag, from->name, to->name);
 421                else
 422                        fprintf(stdout, "%c\t:%s\t", flag, to->name);
 423                if (msg)
 424                        fprintf(stdout, "%s (%s)\n", summary, msg);
 425                else
 426                        fprintf(stdout, "%s\n", summary);
 427        } else {
 428                const char *red = "", *reset = "";
 429                if (push_had_errors(to)) {
 430                        red = transport_get_color(TRANSPORT_COLOR_REJECTED);
 431                        reset = transport_get_color(TRANSPORT_COLOR_RESET);
 432                }
 433                fprintf(stderr, " %s%c %-*s%s ", red, flag, summary_width,
 434                        summary, reset);
 435                if (from)
 436                        fprintf(stderr, "%s -> %s", prettify_refname(from->name), prettify_refname(to->name));
 437                else
 438                        fputs(prettify_refname(to->name), stderr);
 439                if (msg) {
 440                        fputs(" (", stderr);
 441                        fputs(msg, stderr);
 442                        fputc(')', stderr);
 443                }
 444                fputc('\n', stderr);
 445        }
 446}
 447
 448static void print_ok_ref_status(struct ref *ref, int porcelain, int summary_width)
 449{
 450        if (ref->deletion)
 451                print_ref_status('-', "[deleted]", ref, NULL, NULL,
 452                                 porcelain, summary_width);
 453        else if (is_null_oid(&ref->old_oid))
 454                print_ref_status('*',
 455                        (starts_with(ref->name, "refs/tags/") ? "[new tag]" :
 456                        "[new branch]"),
 457                        ref, ref->peer_ref, NULL, porcelain, summary_width);
 458        else {
 459                struct strbuf quickref = STRBUF_INIT;
 460                char type;
 461                const char *msg;
 462
 463                strbuf_add_unique_abbrev(&quickref, &ref->old_oid,
 464                                         DEFAULT_ABBREV);
 465                if (ref->forced_update) {
 466                        strbuf_addstr(&quickref, "...");
 467                        type = '+';
 468                        msg = "forced update";
 469                } else {
 470                        strbuf_addstr(&quickref, "..");
 471                        type = ' ';
 472                        msg = NULL;
 473                }
 474                strbuf_add_unique_abbrev(&quickref, &ref->new_oid,
 475                                         DEFAULT_ABBREV);
 476
 477                print_ref_status(type, quickref.buf, ref, ref->peer_ref, msg,
 478                                 porcelain, summary_width);
 479                strbuf_release(&quickref);
 480        }
 481}
 482
 483static int print_one_push_status(struct ref *ref, const char *dest, int count,
 484                                 int porcelain, int summary_width)
 485{
 486        if (!count) {
 487                char *url = transport_anonymize_url(dest);
 488                fprintf(porcelain ? stdout : stderr, "To %s\n", url);
 489                free(url);
 490        }
 491
 492        switch(ref->status) {
 493        case REF_STATUS_NONE:
 494                print_ref_status('X', "[no match]", ref, NULL, NULL,
 495                                 porcelain, summary_width);
 496                break;
 497        case REF_STATUS_REJECT_NODELETE:
 498                print_ref_status('!', "[rejected]", ref, NULL,
 499                                 "remote does not support deleting refs",
 500                                 porcelain, summary_width);
 501                break;
 502        case REF_STATUS_UPTODATE:
 503                print_ref_status('=', "[up to date]", ref,
 504                                 ref->peer_ref, NULL, porcelain, summary_width);
 505                break;
 506        case REF_STATUS_REJECT_NONFASTFORWARD:
 507                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 508                                 "non-fast-forward", porcelain, summary_width);
 509                break;
 510        case REF_STATUS_REJECT_ALREADY_EXISTS:
 511                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 512                                 "already exists", porcelain, summary_width);
 513                break;
 514        case REF_STATUS_REJECT_FETCH_FIRST:
 515                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 516                                 "fetch first", porcelain, summary_width);
 517                break;
 518        case REF_STATUS_REJECT_NEEDS_FORCE:
 519                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 520                                 "needs force", porcelain, summary_width);
 521                break;
 522        case REF_STATUS_REJECT_STALE:
 523                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 524                                 "stale info", porcelain, summary_width);
 525                break;
 526        case REF_STATUS_REJECT_SHALLOW:
 527                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 528                                 "new shallow roots not allowed",
 529                                 porcelain, summary_width);
 530                break;
 531        case REF_STATUS_REMOTE_REJECT:
 532                print_ref_status('!', "[remote rejected]", ref,
 533                                 ref->deletion ? NULL : ref->peer_ref,
 534                                 ref->remote_status, porcelain, summary_width);
 535                break;
 536        case REF_STATUS_EXPECTING_REPORT:
 537                print_ref_status('!', "[remote failure]", ref,
 538                                 ref->deletion ? NULL : ref->peer_ref,
 539                                 "remote failed to report status",
 540                                 porcelain, summary_width);
 541                break;
 542        case REF_STATUS_ATOMIC_PUSH_FAILED:
 543                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 544                                 "atomic push failed", porcelain, summary_width);
 545                break;
 546        case REF_STATUS_OK:
 547                print_ok_ref_status(ref, porcelain, summary_width);
 548                break;
 549        }
 550
 551        return 1;
 552}
 553
 554static int measure_abbrev(const struct object_id *oid, int sofar)
 555{
 556        char hex[GIT_MAX_HEXSZ + 1];
 557        int w = find_unique_abbrev_r(hex, oid, DEFAULT_ABBREV);
 558
 559        return (w < sofar) ? sofar : w;
 560}
 561
 562int transport_summary_width(const struct ref *refs)
 563{
 564        int maxw = -1;
 565
 566        for (; refs; refs = refs->next) {
 567                maxw = measure_abbrev(&refs->old_oid, maxw);
 568                maxw = measure_abbrev(&refs->new_oid, maxw);
 569        }
 570        if (maxw < 0)
 571                maxw = FALLBACK_DEFAULT_ABBREV;
 572        return (2 * maxw + 3);
 573}
 574
 575void transport_print_push_status(const char *dest, struct ref *refs,
 576                                  int verbose, int porcelain, unsigned int *reject_reasons)
 577{
 578        struct ref *ref;
 579        int n = 0;
 580        char *head;
 581        int summary_width = transport_summary_width(refs);
 582
 583        if (transport_color_config() < 0)
 584                warning(_("could not parse transport.color.* config"));
 585
 586        head = resolve_refdup("HEAD", RESOLVE_REF_READING, NULL, NULL);
 587
 588        if (verbose) {
 589                for (ref = refs; ref; ref = ref->next)
 590                        if (ref->status == REF_STATUS_UPTODATE)
 591                                n += print_one_push_status(ref, dest, n,
 592                                                           porcelain, summary_width);
 593        }
 594
 595        for (ref = refs; ref; ref = ref->next)
 596                if (ref->status == REF_STATUS_OK)
 597                        n += print_one_push_status(ref, dest, n,
 598                                                   porcelain, summary_width);
 599
 600        *reject_reasons = 0;
 601        for (ref = refs; ref; ref = ref->next) {
 602                if (ref->status != REF_STATUS_NONE &&
 603                    ref->status != REF_STATUS_UPTODATE &&
 604                    ref->status != REF_STATUS_OK)
 605                        n += print_one_push_status(ref, dest, n,
 606                                                   porcelain, summary_width);
 607                if (ref->status == REF_STATUS_REJECT_NONFASTFORWARD) {
 608                        if (head != NULL && !strcmp(head, ref->name))
 609                                *reject_reasons |= REJECT_NON_FF_HEAD;
 610                        else
 611                                *reject_reasons |= REJECT_NON_FF_OTHER;
 612                } else if (ref->status == REF_STATUS_REJECT_ALREADY_EXISTS) {
 613                        *reject_reasons |= REJECT_ALREADY_EXISTS;
 614                } else if (ref->status == REF_STATUS_REJECT_FETCH_FIRST) {
 615                        *reject_reasons |= REJECT_FETCH_FIRST;
 616                } else if (ref->status == REF_STATUS_REJECT_NEEDS_FORCE) {
 617                        *reject_reasons |= REJECT_NEEDS_FORCE;
 618                }
 619        }
 620        free(head);
 621}
 622
 623static int git_transport_push(struct transport *transport, struct ref *remote_refs, int flags)
 624{
 625        struct git_transport_data *data = transport->data;
 626        struct send_pack_args args;
 627        int ret = 0;
 628
 629        if (transport_color_config() < 0)
 630                return -1;
 631
 632        if (!data->got_remote_heads)
 633                get_refs_via_connect(transport, 1, NULL);
 634
 635        memset(&args, 0, sizeof(args));
 636        args.send_mirror = !!(flags & TRANSPORT_PUSH_MIRROR);
 637        args.force_update = !!(flags & TRANSPORT_PUSH_FORCE);
 638        args.use_thin_pack = data->options.thin;
 639        args.verbose = (transport->verbose > 0);
 640        args.quiet = (transport->verbose < 0);
 641        args.progress = transport->progress;
 642        args.dry_run = !!(flags & TRANSPORT_PUSH_DRY_RUN);
 643        args.porcelain = !!(flags & TRANSPORT_PUSH_PORCELAIN);
 644        args.atomic = !!(flags & TRANSPORT_PUSH_ATOMIC);
 645        args.push_options = transport->push_options;
 646        args.url = transport->url;
 647
 648        if (flags & TRANSPORT_PUSH_CERT_ALWAYS)
 649                args.push_cert = SEND_PACK_PUSH_CERT_ALWAYS;
 650        else if (flags & TRANSPORT_PUSH_CERT_IF_ASKED)
 651                args.push_cert = SEND_PACK_PUSH_CERT_IF_ASKED;
 652        else
 653                args.push_cert = SEND_PACK_PUSH_CERT_NEVER;
 654
 655        switch (data->version) {
 656        case protocol_v2:
 657                die("support for protocol v2 not implemented yet");
 658                break;
 659        case protocol_v1:
 660        case protocol_v0:
 661                ret = send_pack(&args, data->fd, data->conn, remote_refs,
 662                                &data->extra_have);
 663                break;
 664        case protocol_unknown_version:
 665                BUG("unknown protocol version");
 666        }
 667
 668        close(data->fd[1]);
 669        close(data->fd[0]);
 670        ret |= finish_connect(data->conn);
 671        data->conn = NULL;
 672        data->got_remote_heads = 0;
 673
 674        return ret;
 675}
 676
 677static int connect_git(struct transport *transport, const char *name,
 678                       const char *executable, int fd[2])
 679{
 680        struct git_transport_data *data = transport->data;
 681        data->conn = git_connect(data->fd, transport->url,
 682                                 executable, 0);
 683        fd[0] = data->fd[0];
 684        fd[1] = data->fd[1];
 685        return 0;
 686}
 687
 688static int disconnect_git(struct transport *transport)
 689{
 690        struct git_transport_data *data = transport->data;
 691        if (data->conn) {
 692                if (data->got_remote_heads)
 693                        packet_flush(data->fd[1]);
 694                close(data->fd[0]);
 695                close(data->fd[1]);
 696                finish_connect(data->conn);
 697        }
 698
 699        free(data);
 700        return 0;
 701}
 702
 703static struct transport_vtable taken_over_vtable = {
 704        NULL,
 705        get_refs_via_connect,
 706        fetch_refs_via_pack,
 707        git_transport_push,
 708        NULL,
 709        disconnect_git
 710};
 711
 712void transport_take_over(struct transport *transport,
 713                         struct child_process *child)
 714{
 715        struct git_transport_data *data;
 716
 717        if (!transport->smart_options)
 718                BUG("taking over transport requires non-NULL "
 719                    "smart_options field.");
 720
 721        data = xcalloc(1, sizeof(*data));
 722        data->options = *transport->smart_options;
 723        data->conn = child;
 724        data->fd[0] = data->conn->out;
 725        data->fd[1] = data->conn->in;
 726        data->got_remote_heads = 0;
 727        transport->data = data;
 728
 729        transport->vtable = &taken_over_vtable;
 730        transport->smart_options = &(data->options);
 731
 732        transport->cannot_reuse = 1;
 733}
 734
 735static int is_file(const char *url)
 736{
 737        struct stat buf;
 738        if (stat(url, &buf))
 739                return 0;
 740        return S_ISREG(buf.st_mode);
 741}
 742
 743static int external_specification_len(const char *url)
 744{
 745        return strchr(url, ':') - url;
 746}
 747
 748static const struct string_list *protocol_whitelist(void)
 749{
 750        static int enabled = -1;
 751        static struct string_list allowed = STRING_LIST_INIT_DUP;
 752
 753        if (enabled < 0) {
 754                const char *v = getenv("GIT_ALLOW_PROTOCOL");
 755                if (v) {
 756                        string_list_split(&allowed, v, ':', -1);
 757                        string_list_sort(&allowed);
 758                        enabled = 1;
 759                } else {
 760                        enabled = 0;
 761                }
 762        }
 763
 764        return enabled ? &allowed : NULL;
 765}
 766
 767enum protocol_allow_config {
 768        PROTOCOL_ALLOW_NEVER = 0,
 769        PROTOCOL_ALLOW_USER_ONLY,
 770        PROTOCOL_ALLOW_ALWAYS
 771};
 772
 773static enum protocol_allow_config parse_protocol_config(const char *key,
 774                                                        const char *value)
 775{
 776        if (!strcasecmp(value, "always"))
 777                return PROTOCOL_ALLOW_ALWAYS;
 778        else if (!strcasecmp(value, "never"))
 779                return PROTOCOL_ALLOW_NEVER;
 780        else if (!strcasecmp(value, "user"))
 781                return PROTOCOL_ALLOW_USER_ONLY;
 782
 783        die("unknown value for config '%s': %s", key, value);
 784}
 785
 786static enum protocol_allow_config get_protocol_config(const char *type)
 787{
 788        char *key = xstrfmt("protocol.%s.allow", type);
 789        char *value;
 790
 791        /* first check the per-protocol config */
 792        if (!git_config_get_string(key, &value)) {
 793                enum protocol_allow_config ret =
 794                        parse_protocol_config(key, value);
 795                free(key);
 796                free(value);
 797                return ret;
 798        }
 799        free(key);
 800
 801        /* if defined, fallback to user-defined default for unknown protocols */
 802        if (!git_config_get_string("protocol.allow", &value)) {
 803                enum protocol_allow_config ret =
 804                        parse_protocol_config("protocol.allow", value);
 805                free(value);
 806                return ret;
 807        }
 808
 809        /* fallback to built-in defaults */
 810        /* known safe */
 811        if (!strcmp(type, "http") ||
 812            !strcmp(type, "https") ||
 813            !strcmp(type, "git") ||
 814            !strcmp(type, "ssh") ||
 815            !strcmp(type, "file"))
 816                return PROTOCOL_ALLOW_ALWAYS;
 817
 818        /* known scary; err on the side of caution */
 819        if (!strcmp(type, "ext"))
 820                return PROTOCOL_ALLOW_NEVER;
 821
 822        /* unknown; by default let them be used only directly by the user */
 823        return PROTOCOL_ALLOW_USER_ONLY;
 824}
 825
 826int is_transport_allowed(const char *type, int from_user)
 827{
 828        const struct string_list *whitelist = protocol_whitelist();
 829        if (whitelist)
 830                return string_list_has_string(whitelist, type);
 831
 832        switch (get_protocol_config(type)) {
 833        case PROTOCOL_ALLOW_ALWAYS:
 834                return 1;
 835        case PROTOCOL_ALLOW_NEVER:
 836                return 0;
 837        case PROTOCOL_ALLOW_USER_ONLY:
 838                if (from_user < 0)
 839                        from_user = git_env_bool("GIT_PROTOCOL_FROM_USER", 1);
 840                return from_user;
 841        }
 842
 843        BUG("invalid protocol_allow_config type");
 844}
 845
 846void transport_check_allowed(const char *type)
 847{
 848        if (!is_transport_allowed(type, -1))
 849                die("transport '%s' not allowed", type);
 850}
 851
 852static struct transport_vtable bundle_vtable = {
 853        NULL,
 854        get_refs_from_bundle,
 855        fetch_refs_from_bundle,
 856        NULL,
 857        NULL,
 858        close_bundle
 859};
 860
 861static struct transport_vtable builtin_smart_vtable = {
 862        NULL,
 863        get_refs_via_connect,
 864        fetch_refs_via_pack,
 865        git_transport_push,
 866        connect_git,
 867        disconnect_git
 868};
 869
 870struct transport *transport_get(struct remote *remote, const char *url)
 871{
 872        const char *helper;
 873        struct transport *ret = xcalloc(1, sizeof(*ret));
 874
 875        ret->progress = isatty(2);
 876
 877        if (!remote)
 878                die("No remote provided to transport_get()");
 879
 880        ret->got_remote_refs = 0;
 881        ret->remote = remote;
 882        helper = remote->foreign_vcs;
 883
 884        if (!url && remote->url)
 885                url = remote->url[0];
 886        ret->url = url;
 887
 888        /* maybe it is a foreign URL? */
 889        if (url) {
 890                const char *p = url;
 891
 892                while (is_urlschemechar(p == url, *p))
 893                        p++;
 894                if (starts_with(p, "::"))
 895                        helper = xstrndup(url, p - url);
 896        }
 897
 898        if (helper) {
 899                transport_helper_init(ret, helper);
 900        } else if (starts_with(url, "rsync:")) {
 901                die("git-over-rsync is no longer supported");
 902        } else if (url_is_local_not_ssh(url) && is_file(url) && is_bundle(url, 1)) {
 903                struct bundle_transport_data *data = xcalloc(1, sizeof(*data));
 904                transport_check_allowed("file");
 905                ret->data = data;
 906                ret->vtable = &bundle_vtable;
 907                ret->smart_options = NULL;
 908        } else if (!is_url(url)
 909                || starts_with(url, "file://")
 910                || starts_with(url, "git://")
 911                || starts_with(url, "ssh://")
 912                || starts_with(url, "git+ssh://") /* deprecated - do not use */
 913                || starts_with(url, "ssh+git://") /* deprecated - do not use */
 914                ) {
 915                /*
 916                 * These are builtin smart transports; "allowed" transports
 917                 * will be checked individually in git_connect.
 918                 */
 919                struct git_transport_data *data = xcalloc(1, sizeof(*data));
 920                ret->data = data;
 921                ret->vtable = &builtin_smart_vtable;
 922                ret->smart_options = &(data->options);
 923
 924                data->conn = NULL;
 925                data->got_remote_heads = 0;
 926        } else {
 927                /* Unknown protocol in URL. Pass to external handler. */
 928                int len = external_specification_len(url);
 929                char *handler = xmemdupz(url, len);
 930                transport_helper_init(ret, handler);
 931        }
 932
 933        if (ret->smart_options) {
 934                ret->smart_options->thin = 1;
 935                ret->smart_options->uploadpack = "git-upload-pack";
 936                if (remote->uploadpack)
 937                        ret->smart_options->uploadpack = remote->uploadpack;
 938                ret->smart_options->receivepack = "git-receive-pack";
 939                if (remote->receivepack)
 940                        ret->smart_options->receivepack = remote->receivepack;
 941        }
 942
 943        return ret;
 944}
 945
 946int transport_set_option(struct transport *transport,
 947                         const char *name, const char *value)
 948{
 949        int git_reports = 1, protocol_reports = 1;
 950
 951        if (transport->smart_options)
 952                git_reports = set_git_option(transport->smart_options,
 953                                             name, value);
 954
 955        if (transport->vtable->set_option)
 956                protocol_reports = transport->vtable->set_option(transport,
 957                                                                 name, value);
 958
 959        /* If either report is 0, report 0 (success). */
 960        if (!git_reports || !protocol_reports)
 961                return 0;
 962        /* If either reports -1 (invalid value), report -1. */
 963        if ((git_reports == -1) || (protocol_reports == -1))
 964                return -1;
 965        /* Otherwise if both report unknown, report unknown. */
 966        return 1;
 967}
 968
 969void transport_set_verbosity(struct transport *transport, int verbosity,
 970        int force_progress)
 971{
 972        if (verbosity >= 1)
 973                transport->verbose = verbosity <= 3 ? verbosity : 3;
 974        if (verbosity < 0)
 975                transport->verbose = -1;
 976
 977        /**
 978         * Rules used to determine whether to report progress (processing aborts
 979         * when a rule is satisfied):
 980         *
 981         *   . Report progress, if force_progress is 1 (ie. --progress).
 982         *   . Don't report progress, if force_progress is 0 (ie. --no-progress).
 983         *   . Don't report progress, if verbosity < 0 (ie. -q/--quiet ).
 984         *   . Report progress if isatty(2) is 1.
 985         **/
 986        if (force_progress >= 0)
 987                transport->progress = !!force_progress;
 988        else
 989                transport->progress = verbosity >= 0 && isatty(2);
 990}
 991
 992static void die_with_unpushed_submodules(struct string_list *needs_pushing)
 993{
 994        int i;
 995
 996        fprintf(stderr, _("The following submodule paths contain changes that can\n"
 997                        "not be found on any remote:\n"));
 998        for (i = 0; i < needs_pushing->nr; i++)
 999                fprintf(stderr, "  %s\n", needs_pushing->items[i].string);
1000        fprintf(stderr, _("\nPlease try\n\n"
1001                          "     git push --recurse-submodules=on-demand\n\n"
1002                          "or cd to the path and use\n\n"
1003                          "     git push\n\n"
1004                          "to push them to a remote.\n\n"));
1005
1006        string_list_clear(needs_pushing, 0);
1007
1008        die(_("Aborting."));
1009}
1010
1011static int run_pre_push_hook(struct transport *transport,
1012                             struct ref *remote_refs)
1013{
1014        int ret = 0, x;
1015        struct ref *r;
1016        struct child_process proc = CHILD_PROCESS_INIT;
1017        struct strbuf buf;
1018        const char *argv[4];
1019
1020        if (!(argv[0] = find_hook("pre-push")))
1021                return 0;
1022
1023        argv[1] = transport->remote->name;
1024        argv[2] = transport->url;
1025        argv[3] = NULL;
1026
1027        proc.argv = argv;
1028        proc.in = -1;
1029
1030        if (start_command(&proc)) {
1031                finish_command(&proc);
1032                return -1;
1033        }
1034
1035        sigchain_push(SIGPIPE, SIG_IGN);
1036
1037        strbuf_init(&buf, 256);
1038
1039        for (r = remote_refs; r; r = r->next) {
1040                if (!r->peer_ref) continue;
1041                if (r->status == REF_STATUS_REJECT_NONFASTFORWARD) continue;
1042                if (r->status == REF_STATUS_REJECT_STALE) continue;
1043                if (r->status == REF_STATUS_UPTODATE) continue;
1044
1045                strbuf_reset(&buf);
1046                strbuf_addf( &buf, "%s %s %s %s\n",
1047                         r->peer_ref->name, oid_to_hex(&r->new_oid),
1048                         r->name, oid_to_hex(&r->old_oid));
1049
1050                if (write_in_full(proc.in, buf.buf, buf.len) < 0) {
1051                        /* We do not mind if a hook does not read all refs. */
1052                        if (errno != EPIPE)
1053                                ret = -1;
1054                        break;
1055                }
1056        }
1057
1058        strbuf_release(&buf);
1059
1060        x = close(proc.in);
1061        if (!ret)
1062                ret = x;
1063
1064        sigchain_pop(SIGPIPE);
1065
1066        x = finish_command(&proc);
1067        if (!ret)
1068                ret = x;
1069
1070        return ret;
1071}
1072
1073int transport_push(struct transport *transport,
1074                   struct refspec *rs, int flags,
1075                   unsigned int *reject_reasons)
1076{
1077        *reject_reasons = 0;
1078
1079        if (transport_color_config() < 0)
1080                return -1;
1081
1082        if (transport->vtable->push_refs) {
1083                struct ref *remote_refs;
1084                struct ref *local_refs = get_local_heads();
1085                int match_flags = MATCH_REFS_NONE;
1086                int verbose = (transport->verbose > 0);
1087                int quiet = (transport->verbose < 0);
1088                int porcelain = flags & TRANSPORT_PUSH_PORCELAIN;
1089                int pretend = flags & TRANSPORT_PUSH_DRY_RUN;
1090                int push_ret, ret, err;
1091                struct argv_array ref_prefixes = ARGV_ARRAY_INIT;
1092
1093                if (check_push_refs(local_refs, rs) < 0)
1094                        return -1;
1095
1096                refspec_ref_prefixes(rs, &ref_prefixes);
1097
1098                remote_refs = transport->vtable->get_refs_list(transport, 1,
1099                                                               &ref_prefixes);
1100
1101                argv_array_clear(&ref_prefixes);
1102
1103                if (flags & TRANSPORT_PUSH_ALL)
1104                        match_flags |= MATCH_REFS_ALL;
1105                if (flags & TRANSPORT_PUSH_MIRROR)
1106                        match_flags |= MATCH_REFS_MIRROR;
1107                if (flags & TRANSPORT_PUSH_PRUNE)
1108                        match_flags |= MATCH_REFS_PRUNE;
1109                if (flags & TRANSPORT_PUSH_FOLLOW_TAGS)
1110                        match_flags |= MATCH_REFS_FOLLOW_TAGS;
1111
1112                if (match_push_refs(local_refs, &remote_refs, rs, match_flags))
1113                        return -1;
1114
1115                if (transport->smart_options &&
1116                    transport->smart_options->cas &&
1117                    !is_empty_cas(transport->smart_options->cas))
1118                        apply_push_cas(transport->smart_options->cas,
1119                                       transport->remote, remote_refs);
1120
1121                set_ref_status_for_push(remote_refs,
1122                        flags & TRANSPORT_PUSH_MIRROR,
1123                        flags & TRANSPORT_PUSH_FORCE);
1124
1125                if (!(flags & TRANSPORT_PUSH_NO_HOOK))
1126                        if (run_pre_push_hook(transport, remote_refs))
1127                                return -1;
1128
1129                if ((flags & (TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND |
1130                              TRANSPORT_RECURSE_SUBMODULES_ONLY)) &&
1131                    !is_bare_repository()) {
1132                        struct ref *ref = remote_refs;
1133                        struct oid_array commits = OID_ARRAY_INIT;
1134
1135                        for (; ref; ref = ref->next)
1136                                if (!is_null_oid(&ref->new_oid))
1137                                        oid_array_append(&commits,
1138                                                          &ref->new_oid);
1139
1140                        if (!push_unpushed_submodules(&commits,
1141                                                      transport->remote,
1142                                                      rs,
1143                                                      transport->push_options,
1144                                                      pretend)) {
1145                                oid_array_clear(&commits);
1146                                die("Failed to push all needed submodules!");
1147                        }
1148                        oid_array_clear(&commits);
1149                }
1150
1151                if (((flags & TRANSPORT_RECURSE_SUBMODULES_CHECK) ||
1152                     ((flags & (TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND |
1153                                TRANSPORT_RECURSE_SUBMODULES_ONLY)) &&
1154                      !pretend)) && !is_bare_repository()) {
1155                        struct ref *ref = remote_refs;
1156                        struct string_list needs_pushing = STRING_LIST_INIT_DUP;
1157                        struct oid_array commits = OID_ARRAY_INIT;
1158
1159                        for (; ref; ref = ref->next)
1160                                if (!is_null_oid(&ref->new_oid))
1161                                        oid_array_append(&commits,
1162                                                          &ref->new_oid);
1163
1164                        if (find_unpushed_submodules(&commits, transport->remote->name,
1165                                                &needs_pushing)) {
1166                                oid_array_clear(&commits);
1167                                die_with_unpushed_submodules(&needs_pushing);
1168                        }
1169                        string_list_clear(&needs_pushing, 0);
1170                        oid_array_clear(&commits);
1171                }
1172
1173                if (!(flags & TRANSPORT_RECURSE_SUBMODULES_ONLY))
1174                        push_ret = transport->vtable->push_refs(transport, remote_refs, flags);
1175                else
1176                        push_ret = 0;
1177                err = push_had_errors(remote_refs);
1178                ret = push_ret | err;
1179
1180                if (!quiet || err)
1181                        transport_print_push_status(transport->url, remote_refs,
1182                                        verbose | porcelain, porcelain,
1183                                        reject_reasons);
1184
1185                if (flags & TRANSPORT_PUSH_SET_UPSTREAM)
1186                        set_upstreams(transport, remote_refs, pretend);
1187
1188                if (!(flags & (TRANSPORT_PUSH_DRY_RUN |
1189                               TRANSPORT_RECURSE_SUBMODULES_ONLY))) {
1190                        struct ref *ref;
1191                        for (ref = remote_refs; ref; ref = ref->next)
1192                                transport_update_tracking_ref(transport->remote, ref, verbose);
1193                }
1194
1195                if (porcelain && !push_ret)
1196                        puts("Done");
1197                else if (!quiet && !ret && !transport_refs_pushed(remote_refs))
1198                        fprintf(stderr, "Everything up-to-date\n");
1199
1200                return ret;
1201        }
1202        return 1;
1203}
1204
1205const struct ref *transport_get_remote_refs(struct transport *transport,
1206                                            const struct argv_array *ref_prefixes)
1207{
1208        if (!transport->got_remote_refs) {
1209                transport->remote_refs =
1210                        transport->vtable->get_refs_list(transport, 0,
1211                                                         ref_prefixes);
1212                transport->got_remote_refs = 1;
1213        }
1214
1215        return transport->remote_refs;
1216}
1217
1218int transport_fetch_refs(struct transport *transport, struct ref *refs)
1219{
1220        int rc;
1221        int nr_heads = 0, nr_alloc = 0, nr_refs = 0;
1222        struct ref **heads = NULL;
1223        struct ref *rm;
1224
1225        for (rm = refs; rm; rm = rm->next) {
1226                nr_refs++;
1227                if (rm->peer_ref &&
1228                    !is_null_oid(&rm->old_oid) &&
1229                    !oidcmp(&rm->peer_ref->old_oid, &rm->old_oid))
1230                        continue;
1231                ALLOC_GROW(heads, nr_heads + 1, nr_alloc);
1232                heads[nr_heads++] = rm;
1233        }
1234
1235        if (!nr_heads) {
1236                /*
1237                 * When deepening of a shallow repository is requested,
1238                 * then local and remote refs are likely to still be equal.
1239                 * Just feed them all to the fetch method in that case.
1240                 * This condition shouldn't be met in a non-deepening fetch
1241                 * (see builtin/fetch.c:quickfetch()).
1242                 */
1243                ALLOC_ARRAY(heads, nr_refs);
1244                for (rm = refs; rm; rm = rm->next)
1245                        heads[nr_heads++] = rm;
1246        }
1247
1248        rc = transport->vtable->fetch(transport, nr_heads, heads);
1249
1250        free(heads);
1251        return rc;
1252}
1253
1254void transport_unlock_pack(struct transport *transport)
1255{
1256        if (transport->pack_lockfile) {
1257                unlink_or_warn(transport->pack_lockfile);
1258                FREE_AND_NULL(transport->pack_lockfile);
1259        }
1260}
1261
1262int transport_connect(struct transport *transport, const char *name,
1263                      const char *exec, int fd[2])
1264{
1265        if (transport->vtable->connect)
1266                return transport->vtable->connect(transport, name, exec, fd);
1267        else
1268                die("Operation not supported by protocol");
1269}
1270
1271int transport_disconnect(struct transport *transport)
1272{
1273        int ret = 0;
1274        if (transport->vtable->disconnect)
1275                ret = transport->vtable->disconnect(transport);
1276        free(transport);
1277        return ret;
1278}
1279
1280/*
1281 * Strip username (and password) from a URL and return
1282 * it in a newly allocated string.
1283 */
1284char *transport_anonymize_url(const char *url)
1285{
1286        char *scheme_prefix, *anon_part;
1287        size_t anon_len, prefix_len = 0;
1288
1289        anon_part = strchr(url, '@');
1290        if (url_is_local_not_ssh(url) || !anon_part)
1291                goto literal_copy;
1292
1293        anon_len = strlen(++anon_part);
1294        scheme_prefix = strstr(url, "://");
1295        if (!scheme_prefix) {
1296                if (!strchr(anon_part, ':'))
1297                        /* cannot be "me@there:/path/name" */
1298                        goto literal_copy;
1299        } else {
1300                const char *cp;
1301                /* make sure scheme is reasonable */
1302                for (cp = url; cp < scheme_prefix; cp++) {
1303                        switch (*cp) {
1304                                /* RFC 1738 2.1 */
1305                        case '+': case '.': case '-':
1306                                break; /* ok */
1307                        default:
1308                                if (isalnum(*cp))
1309                                        break;
1310                                /* it isn't */
1311                                goto literal_copy;
1312                        }
1313                }
1314                /* @ past the first slash does not count */
1315                cp = strchr(scheme_prefix + 3, '/');
1316                if (cp && cp < anon_part)
1317                        goto literal_copy;
1318                prefix_len = scheme_prefix - url + 3;
1319        }
1320        return xstrfmt("%.*s%.*s", (int)prefix_len, url,
1321                       (int)anon_len, anon_part);
1322literal_copy:
1323        return xstrdup(url);
1324}
1325
1326static void read_alternate_refs(const char *path,
1327                                alternate_ref_fn *cb,
1328                                void *data)
1329{
1330        struct child_process cmd = CHILD_PROCESS_INIT;
1331        struct strbuf line = STRBUF_INIT;
1332        FILE *fh;
1333
1334        cmd.git_cmd = 1;
1335        argv_array_pushf(&cmd.args, "--git-dir=%s", path);
1336        argv_array_push(&cmd.args, "for-each-ref");
1337        argv_array_push(&cmd.args, "--format=%(objectname) %(refname)");
1338        cmd.env = local_repo_env;
1339        cmd.out = -1;
1340
1341        if (start_command(&cmd))
1342                return;
1343
1344        fh = xfdopen(cmd.out, "r");
1345        while (strbuf_getline_lf(&line, fh) != EOF) {
1346                struct object_id oid;
1347
1348                if (get_oid_hex(line.buf, &oid) ||
1349                    line.buf[GIT_SHA1_HEXSZ] != ' ') {
1350                        warning("invalid line while parsing alternate refs: %s",
1351                                line.buf);
1352                        break;
1353                }
1354
1355                cb(line.buf + GIT_SHA1_HEXSZ + 1, &oid, data);
1356        }
1357
1358        fclose(fh);
1359        finish_command(&cmd);
1360}
1361
1362struct alternate_refs_data {
1363        alternate_ref_fn *fn;
1364        void *data;
1365};
1366
1367static int refs_from_alternate_cb(struct alternate_object_database *e,
1368                                  void *data)
1369{
1370        struct strbuf path = STRBUF_INIT;
1371        size_t base_len;
1372        struct alternate_refs_data *cb = data;
1373
1374        if (!strbuf_realpath(&path, e->path, 0))
1375                goto out;
1376        if (!strbuf_strip_suffix(&path, "/objects"))
1377                goto out;
1378        base_len = path.len;
1379
1380        /* Is this a git repository with refs? */
1381        strbuf_addstr(&path, "/refs");
1382        if (!is_directory(path.buf))
1383                goto out;
1384        strbuf_setlen(&path, base_len);
1385
1386        read_alternate_refs(path.buf, cb->fn, cb->data);
1387
1388out:
1389        strbuf_release(&path);
1390        return 0;
1391}
1392
1393void for_each_alternate_ref(alternate_ref_fn fn, void *data)
1394{
1395        struct alternate_refs_data cb;
1396        cb.fn = fn;
1397        cb.data = data;
1398        foreach_alt_odb(refs_from_alternate_cb, &cb);
1399}