Andrew's git / gitweb.git / transport.c
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transport.con commit transport: remove transport_verify_remote_names (7a78a82)
   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);
 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
 321        if (!data->got_remote_heads)
 322                refs_tmp = get_refs_via_connect(transport, 0, NULL);
 323
 324        switch (data->version) {
 325        case protocol_v2:
 326                refs = fetch_pack(&args, data->fd, data->conn,
 327                                  refs_tmp ? refs_tmp : transport->remote_refs,
 328                                  dest, to_fetch, nr_heads, &data->shallow,
 329                                  &transport->pack_lockfile, data->version);
 330                break;
 331        case protocol_v1:
 332        case protocol_v0:
 333                refs = fetch_pack(&args, data->fd, data->conn,
 334                                  refs_tmp ? refs_tmp : transport->remote_refs,
 335                                  dest, to_fetch, nr_heads, &data->shallow,
 336                                  &transport->pack_lockfile, data->version);
 337                break;
 338        case protocol_unknown_version:
 339                BUG("unknown protocol version");
 340        }
 341
 342        close(data->fd[0]);
 343        close(data->fd[1]);
 344        if (finish_connect(data->conn))
 345                ret = -1;
 346        data->conn = NULL;
 347        data->got_remote_heads = 0;
 348        data->options.self_contained_and_connected =
 349                args.self_contained_and_connected;
 350
 351        if (refs == NULL)
 352                ret = -1;
 353        if (report_unmatched_refs(to_fetch, nr_heads))
 354                ret = -1;
 355
 356        free_refs(refs_tmp);
 357        free_refs(refs);
 358        free(dest);
 359        return ret;
 360}
 361
 362static int push_had_errors(struct ref *ref)
 363{
 364        for (; ref; ref = ref->next) {
 365                switch (ref->status) {
 366                case REF_STATUS_NONE:
 367                case REF_STATUS_UPTODATE:
 368                case REF_STATUS_OK:
 369                        break;
 370                default:
 371                        return 1;
 372                }
 373        }
 374        return 0;
 375}
 376
 377int transport_refs_pushed(struct ref *ref)
 378{
 379        for (; ref; ref = ref->next) {
 380                switch(ref->status) {
 381                case REF_STATUS_NONE:
 382                case REF_STATUS_UPTODATE:
 383                        break;
 384                default:
 385                        return 1;
 386                }
 387        }
 388        return 0;
 389}
 390
 391void transport_update_tracking_ref(struct remote *remote, struct ref *ref, int verbose)
 392{
 393        struct refspec_item rs;
 394
 395        if (ref->status != REF_STATUS_OK && ref->status != REF_STATUS_UPTODATE)
 396                return;
 397
 398        rs.src = ref->name;
 399        rs.dst = NULL;
 400
 401        if (!remote_find_tracking(remote, &rs)) {
 402                if (verbose)
 403                        fprintf(stderr, "updating local tracking ref '%s'\n", rs.dst);
 404                if (ref->deletion) {
 405                        delete_ref(NULL, rs.dst, NULL, 0);
 406                } else
 407                        update_ref("update by push", rs.dst, &ref->new_oid,
 408                                   NULL, 0, 0);
 409                free(rs.dst);
 410        }
 411}
 412
 413static void print_ref_status(char flag, const char *summary,
 414                             struct ref *to, struct ref *from, const char *msg,
 415                             int porcelain, int summary_width)
 416{
 417        if (porcelain) {
 418                if (from)
 419                        fprintf(stdout, "%c\t%s:%s\t", flag, from->name, to->name);
 420                else
 421                        fprintf(stdout, "%c\t:%s\t", flag, to->name);
 422                if (msg)
 423                        fprintf(stdout, "%s (%s)\n", summary, msg);
 424                else
 425                        fprintf(stdout, "%s\n", summary);
 426        } else {
 427                const char *red = "", *reset = "";
 428                if (push_had_errors(to)) {
 429                        red = transport_get_color(TRANSPORT_COLOR_REJECTED);
 430                        reset = transport_get_color(TRANSPORT_COLOR_RESET);
 431                }
 432                fprintf(stderr, " %s%c %-*s%s ", red, flag, summary_width,
 433                        summary, reset);
 434                if (from)
 435                        fprintf(stderr, "%s -> %s", prettify_refname(from->name), prettify_refname(to->name));
 436                else
 437                        fputs(prettify_refname(to->name), stderr);
 438                if (msg) {
 439                        fputs(" (", stderr);
 440                        fputs(msg, stderr);
 441                        fputc(')', stderr);
 442                }
 443                fputc('\n', stderr);
 444        }
 445}
 446
 447static void print_ok_ref_status(struct ref *ref, int porcelain, int summary_width)
 448{
 449        if (ref->deletion)
 450                print_ref_status('-', "[deleted]", ref, NULL, NULL,
 451                                 porcelain, summary_width);
 452        else if (is_null_oid(&ref->old_oid))
 453                print_ref_status('*',
 454                        (starts_with(ref->name, "refs/tags/") ? "[new tag]" :
 455                        "[new branch]"),
 456                        ref, ref->peer_ref, NULL, porcelain, summary_width);
 457        else {
 458                struct strbuf quickref = STRBUF_INIT;
 459                char type;
 460                const char *msg;
 461
 462                strbuf_add_unique_abbrev(&quickref, &ref->old_oid,
 463                                         DEFAULT_ABBREV);
 464                if (ref->forced_update) {
 465                        strbuf_addstr(&quickref, "...");
 466                        type = '+';
 467                        msg = "forced update";
 468                } else {
 469                        strbuf_addstr(&quickref, "..");
 470                        type = ' ';
 471                        msg = NULL;
 472                }
 473                strbuf_add_unique_abbrev(&quickref, &ref->new_oid,
 474                                         DEFAULT_ABBREV);
 475
 476                print_ref_status(type, quickref.buf, ref, ref->peer_ref, msg,
 477                                 porcelain, summary_width);
 478                strbuf_release(&quickref);
 479        }
 480}
 481
 482static int print_one_push_status(struct ref *ref, const char *dest, int count,
 483                                 int porcelain, int summary_width)
 484{
 485        if (!count) {
 486                char *url = transport_anonymize_url(dest);
 487                fprintf(porcelain ? stdout : stderr, "To %s\n", url);
 488                free(url);
 489        }
 490
 491        switch(ref->status) {
 492        case REF_STATUS_NONE:
 493                print_ref_status('X', "[no match]", ref, NULL, NULL,
 494                                 porcelain, summary_width);
 495                break;
 496        case REF_STATUS_REJECT_NODELETE:
 497                print_ref_status('!', "[rejected]", ref, NULL,
 498                                 "remote does not support deleting refs",
 499                                 porcelain, summary_width);
 500                break;
 501        case REF_STATUS_UPTODATE:
 502                print_ref_status('=', "[up to date]", ref,
 503                                 ref->peer_ref, NULL, porcelain, summary_width);
 504                break;
 505        case REF_STATUS_REJECT_NONFASTFORWARD:
 506                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 507                                 "non-fast-forward", porcelain, summary_width);
 508                break;
 509        case REF_STATUS_REJECT_ALREADY_EXISTS:
 510                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 511                                 "already exists", porcelain, summary_width);
 512                break;
 513        case REF_STATUS_REJECT_FETCH_FIRST:
 514                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 515                                 "fetch first", porcelain, summary_width);
 516                break;
 517        case REF_STATUS_REJECT_NEEDS_FORCE:
 518                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 519                                 "needs force", porcelain, summary_width);
 520                break;
 521        case REF_STATUS_REJECT_STALE:
 522                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 523                                 "stale info", porcelain, summary_width);
 524                break;
 525        case REF_STATUS_REJECT_SHALLOW:
 526                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 527                                 "new shallow roots not allowed",
 528                                 porcelain, summary_width);
 529                break;
 530        case REF_STATUS_REMOTE_REJECT:
 531                print_ref_status('!', "[remote rejected]", ref,
 532                                 ref->deletion ? NULL : ref->peer_ref,
 533                                 ref->remote_status, porcelain, summary_width);
 534                break;
 535        case REF_STATUS_EXPECTING_REPORT:
 536                print_ref_status('!', "[remote failure]", ref,
 537                                 ref->deletion ? NULL : ref->peer_ref,
 538                                 "remote failed to report status",
 539                                 porcelain, summary_width);
 540                break;
 541        case REF_STATUS_ATOMIC_PUSH_FAILED:
 542                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 543                                 "atomic push failed", porcelain, summary_width);
 544                break;
 545        case REF_STATUS_OK:
 546                print_ok_ref_status(ref, porcelain, summary_width);
 547                break;
 548        }
 549
 550        return 1;
 551}
 552
 553static int measure_abbrev(const struct object_id *oid, int sofar)
 554{
 555        char hex[GIT_MAX_HEXSZ + 1];
 556        int w = find_unique_abbrev_r(hex, oid, DEFAULT_ABBREV);
 557
 558        return (w < sofar) ? sofar : w;
 559}
 560
 561int transport_summary_width(const struct ref *refs)
 562{
 563        int maxw = -1;
 564
 565        for (; refs; refs = refs->next) {
 566                maxw = measure_abbrev(&refs->old_oid, maxw);
 567                maxw = measure_abbrev(&refs->new_oid, maxw);
 568        }
 569        if (maxw < 0)
 570                maxw = FALLBACK_DEFAULT_ABBREV;
 571        return (2 * maxw + 3);
 572}
 573
 574void transport_print_push_status(const char *dest, struct ref *refs,
 575                                  int verbose, int porcelain, unsigned int *reject_reasons)
 576{
 577        struct ref *ref;
 578        int n = 0;
 579        char *head;
 580        int summary_width = transport_summary_width(refs);
 581
 582        if (transport_color_config() < 0)
 583                warning(_("could not parse transport.color.* config"));
 584
 585        head = resolve_refdup("HEAD", RESOLVE_REF_READING, NULL, NULL);
 586
 587        if (verbose) {
 588                for (ref = refs; ref; ref = ref->next)
 589                        if (ref->status == REF_STATUS_UPTODATE)
 590                                n += print_one_push_status(ref, dest, n,
 591                                                           porcelain, summary_width);
 592        }
 593
 594        for (ref = refs; ref; ref = ref->next)
 595                if (ref->status == REF_STATUS_OK)
 596                        n += print_one_push_status(ref, dest, n,
 597                                                   porcelain, summary_width);
 598
 599        *reject_reasons = 0;
 600        for (ref = refs; ref; ref = ref->next) {
 601                if (ref->status != REF_STATUS_NONE &&
 602                    ref->status != REF_STATUS_UPTODATE &&
 603                    ref->status != REF_STATUS_OK)
 604                        n += print_one_push_status(ref, dest, n,
 605                                                   porcelain, summary_width);
 606                if (ref->status == REF_STATUS_REJECT_NONFASTFORWARD) {
 607                        if (head != NULL && !strcmp(head, ref->name))
 608                                *reject_reasons |= REJECT_NON_FF_HEAD;
 609                        else
 610                                *reject_reasons |= REJECT_NON_FF_OTHER;
 611                } else if (ref->status == REF_STATUS_REJECT_ALREADY_EXISTS) {
 612                        *reject_reasons |= REJECT_ALREADY_EXISTS;
 613                } else if (ref->status == REF_STATUS_REJECT_FETCH_FIRST) {
 614                        *reject_reasons |= REJECT_FETCH_FIRST;
 615                } else if (ref->status == REF_STATUS_REJECT_NEEDS_FORCE) {
 616                        *reject_reasons |= REJECT_NEEDS_FORCE;
 617                }
 618        }
 619        free(head);
 620}
 621
 622static int git_transport_push(struct transport *transport, struct ref *remote_refs, int flags)
 623{
 624        struct git_transport_data *data = transport->data;
 625        struct send_pack_args args;
 626        int ret = 0;
 627
 628        if (transport_color_config() < 0)
 629                return -1;
 630
 631        if (!data->got_remote_heads)
 632                get_refs_via_connect(transport, 1, NULL);
 633
 634        memset(&args, 0, sizeof(args));
 635        args.send_mirror = !!(flags & TRANSPORT_PUSH_MIRROR);
 636        args.force_update = !!(flags & TRANSPORT_PUSH_FORCE);
 637        args.use_thin_pack = data->options.thin;
 638        args.verbose = (transport->verbose > 0);
 639        args.quiet = (transport->verbose < 0);
 640        args.progress = transport->progress;
 641        args.dry_run = !!(flags & TRANSPORT_PUSH_DRY_RUN);
 642        args.porcelain = !!(flags & TRANSPORT_PUSH_PORCELAIN);
 643        args.atomic = !!(flags & TRANSPORT_PUSH_ATOMIC);
 644        args.push_options = transport->push_options;
 645        args.url = transport->url;
 646
 647        if (flags & TRANSPORT_PUSH_CERT_ALWAYS)
 648                args.push_cert = SEND_PACK_PUSH_CERT_ALWAYS;
 649        else if (flags & TRANSPORT_PUSH_CERT_IF_ASKED)
 650                args.push_cert = SEND_PACK_PUSH_CERT_IF_ASKED;
 651        else
 652                args.push_cert = SEND_PACK_PUSH_CERT_NEVER;
 653
 654        switch (data->version) {
 655        case protocol_v2:
 656                die("support for protocol v2 not implemented yet");
 657                break;
 658        case protocol_v1:
 659        case protocol_v0:
 660                ret = send_pack(&args, data->fd, data->conn, remote_refs,
 661                                &data->extra_have);
 662                break;
 663        case protocol_unknown_version:
 664                BUG("unknown protocol version");
 665        }
 666
 667        close(data->fd[1]);
 668        close(data->fd[0]);
 669        ret |= finish_connect(data->conn);
 670        data->conn = NULL;
 671        data->got_remote_heads = 0;
 672
 673        return ret;
 674}
 675
 676static int connect_git(struct transport *transport, const char *name,
 677                       const char *executable, int fd[2])
 678{
 679        struct git_transport_data *data = transport->data;
 680        data->conn = git_connect(data->fd, transport->url,
 681                                 executable, 0);
 682        fd[0] = data->fd[0];
 683        fd[1] = data->fd[1];
 684        return 0;
 685}
 686
 687static int disconnect_git(struct transport *transport)
 688{
 689        struct git_transport_data *data = transport->data;
 690        if (data->conn) {
 691                if (data->got_remote_heads)
 692                        packet_flush(data->fd[1]);
 693                close(data->fd[0]);
 694                close(data->fd[1]);
 695                finish_connect(data->conn);
 696        }
 697
 698        free(data);
 699        return 0;
 700}
 701
 702static struct transport_vtable taken_over_vtable = {
 703        NULL,
 704        get_refs_via_connect,
 705        fetch_refs_via_pack,
 706        git_transport_push,
 707        NULL,
 708        disconnect_git
 709};
 710
 711void transport_take_over(struct transport *transport,
 712                         struct child_process *child)
 713{
 714        struct git_transport_data *data;
 715
 716        if (!transport->smart_options)
 717                die("BUG: taking over transport requires non-NULL "
 718                    "smart_options field.");
 719
 720        data = xcalloc(1, sizeof(*data));
 721        data->options = *transport->smart_options;
 722        data->conn = child;
 723        data->fd[0] = data->conn->out;
 724        data->fd[1] = data->conn->in;
 725        data->got_remote_heads = 0;
 726        transport->data = data;
 727
 728        transport->vtable = &taken_over_vtable;
 729        transport->smart_options = &(data->options);
 730
 731        transport->cannot_reuse = 1;
 732}
 733
 734static int is_file(const char *url)
 735{
 736        struct stat buf;
 737        if (stat(url, &buf))
 738                return 0;
 739        return S_ISREG(buf.st_mode);
 740}
 741
 742static int external_specification_len(const char *url)
 743{
 744        return strchr(url, ':') - url;
 745}
 746
 747static const struct string_list *protocol_whitelist(void)
 748{
 749        static int enabled = -1;
 750        static struct string_list allowed = STRING_LIST_INIT_DUP;
 751
 752        if (enabled < 0) {
 753                const char *v = getenv("GIT_ALLOW_PROTOCOL");
 754                if (v) {
 755                        string_list_split(&allowed, v, ':', -1);
 756                        string_list_sort(&allowed);
 757                        enabled = 1;
 758                } else {
 759                        enabled = 0;
 760                }
 761        }
 762
 763        return enabled ? &allowed : NULL;
 764}
 765
 766enum protocol_allow_config {
 767        PROTOCOL_ALLOW_NEVER = 0,
 768        PROTOCOL_ALLOW_USER_ONLY,
 769        PROTOCOL_ALLOW_ALWAYS
 770};
 771
 772static enum protocol_allow_config parse_protocol_config(const char *key,
 773                                                        const char *value)
 774{
 775        if (!strcasecmp(value, "always"))
 776                return PROTOCOL_ALLOW_ALWAYS;
 777        else if (!strcasecmp(value, "never"))
 778                return PROTOCOL_ALLOW_NEVER;
 779        else if (!strcasecmp(value, "user"))
 780                return PROTOCOL_ALLOW_USER_ONLY;
 781
 782        die("unknown value for config '%s': %s", key, value);
 783}
 784
 785static enum protocol_allow_config get_protocol_config(const char *type)
 786{
 787        char *key = xstrfmt("protocol.%s.allow", type);
 788        char *value;
 789
 790        /* first check the per-protocol config */
 791        if (!git_config_get_string(key, &value)) {
 792                enum protocol_allow_config ret =
 793                        parse_protocol_config(key, value);
 794                free(key);
 795                free(value);
 796                return ret;
 797        }
 798        free(key);
 799
 800        /* if defined, fallback to user-defined default for unknown protocols */
 801        if (!git_config_get_string("protocol.allow", &value)) {
 802                enum protocol_allow_config ret =
 803                        parse_protocol_config("protocol.allow", value);
 804                free(value);
 805                return ret;
 806        }
 807
 808        /* fallback to built-in defaults */
 809        /* known safe */
 810        if (!strcmp(type, "http") ||
 811            !strcmp(type, "https") ||
 812            !strcmp(type, "git") ||
 813            !strcmp(type, "ssh") ||
 814            !strcmp(type, "file"))
 815                return PROTOCOL_ALLOW_ALWAYS;
 816
 817        /* known scary; err on the side of caution */
 818        if (!strcmp(type, "ext"))
 819                return PROTOCOL_ALLOW_NEVER;
 820
 821        /* unknown; by default let them be used only directly by the user */
 822        return PROTOCOL_ALLOW_USER_ONLY;
 823}
 824
 825int is_transport_allowed(const char *type, int from_user)
 826{
 827        const struct string_list *whitelist = protocol_whitelist();
 828        if (whitelist)
 829                return string_list_has_string(whitelist, type);
 830
 831        switch (get_protocol_config(type)) {
 832        case PROTOCOL_ALLOW_ALWAYS:
 833                return 1;
 834        case PROTOCOL_ALLOW_NEVER:
 835                return 0;
 836        case PROTOCOL_ALLOW_USER_ONLY:
 837                if (from_user < 0)
 838                        from_user = git_env_bool("GIT_PROTOCOL_FROM_USER", 1);
 839                return from_user;
 840        }
 841
 842        die("BUG: invalid protocol_allow_config type");
 843}
 844
 845void transport_check_allowed(const char *type)
 846{
 847        if (!is_transport_allowed(type, -1))
 848                die("transport '%s' not allowed", type);
 849}
 850
 851static struct transport_vtable bundle_vtable = {
 852        NULL,
 853        get_refs_from_bundle,
 854        fetch_refs_from_bundle,
 855        NULL,
 856        NULL,
 857        close_bundle
 858};
 859
 860static struct transport_vtable builtin_smart_vtable = {
 861        NULL,
 862        get_refs_via_connect,
 863        fetch_refs_via_pack,
 864        git_transport_push,
 865        connect_git,
 866        disconnect_git
 867};
 868
 869struct transport *transport_get(struct remote *remote, const char *url)
 870{
 871        const char *helper;
 872        struct transport *ret = xcalloc(1, sizeof(*ret));
 873
 874        ret->progress = isatty(2);
 875
 876        if (!remote)
 877                die("No remote provided to transport_get()");
 878
 879        ret->got_remote_refs = 0;
 880        ret->remote = remote;
 881        helper = remote->foreign_vcs;
 882
 883        if (!url && remote->url)
 884                url = remote->url[0];
 885        ret->url = url;
 886
 887        /* maybe it is a foreign URL? */
 888        if (url) {
 889                const char *p = url;
 890
 891                while (is_urlschemechar(p == url, *p))
 892                        p++;
 893                if (starts_with(p, "::"))
 894                        helper = xstrndup(url, p - url);
 895        }
 896
 897        if (helper) {
 898                transport_helper_init(ret, helper);
 899        } else if (starts_with(url, "rsync:")) {
 900                die("git-over-rsync is no longer supported");
 901        } else if (url_is_local_not_ssh(url) && is_file(url) && is_bundle(url, 1)) {
 902                struct bundle_transport_data *data = xcalloc(1, sizeof(*data));
 903                transport_check_allowed("file");
 904                ret->data = data;
 905                ret->vtable = &bundle_vtable;
 906                ret->smart_options = NULL;
 907        } else if (!is_url(url)
 908                || starts_with(url, "file://")
 909                || starts_with(url, "git://")
 910                || starts_with(url, "ssh://")
 911                || starts_with(url, "git+ssh://") /* deprecated - do not use */
 912                || starts_with(url, "ssh+git://") /* deprecated - do not use */
 913                ) {
 914                /*
 915                 * These are builtin smart transports; "allowed" transports
 916                 * will be checked individually in git_connect.
 917                 */
 918                struct git_transport_data *data = xcalloc(1, sizeof(*data));
 919                ret->data = data;
 920                ret->vtable = &builtin_smart_vtable;
 921                ret->smart_options = &(data->options);
 922
 923                data->conn = NULL;
 924                data->got_remote_heads = 0;
 925        } else {
 926                /* Unknown protocol in URL. Pass to external handler. */
 927                int len = external_specification_len(url);
 928                char *handler = xmemdupz(url, len);
 929                transport_helper_init(ret, handler);
 930        }
 931
 932        if (ret->smart_options) {
 933                ret->smart_options->thin = 1;
 934                ret->smart_options->uploadpack = "git-upload-pack";
 935                if (remote->uploadpack)
 936                        ret->smart_options->uploadpack = remote->uploadpack;
 937                ret->smart_options->receivepack = "git-receive-pack";
 938                if (remote->receivepack)
 939                        ret->smart_options->receivepack = remote->receivepack;
 940        }
 941
 942        return ret;
 943}
 944
 945int transport_set_option(struct transport *transport,
 946                         const char *name, const char *value)
 947{
 948        int git_reports = 1, protocol_reports = 1;
 949
 950        if (transport->smart_options)
 951                git_reports = set_git_option(transport->smart_options,
 952                                             name, value);
 953
 954        if (transport->vtable->set_option)
 955                protocol_reports = transport->vtable->set_option(transport,
 956                                                                 name, value);
 957
 958        /* If either report is 0, report 0 (success). */
 959        if (!git_reports || !protocol_reports)
 960                return 0;
 961        /* If either reports -1 (invalid value), report -1. */
 962        if ((git_reports == -1) || (protocol_reports == -1))
 963                return -1;
 964        /* Otherwise if both report unknown, report unknown. */
 965        return 1;
 966}
 967
 968void transport_set_verbosity(struct transport *transport, int verbosity,
 969        int force_progress)
 970{
 971        if (verbosity >= 1)
 972                transport->verbose = verbosity <= 3 ? verbosity : 3;
 973        if (verbosity < 0)
 974                transport->verbose = -1;
 975
 976        /**
 977         * Rules used to determine whether to report progress (processing aborts
 978         * when a rule is satisfied):
 979         *
 980         *   . Report progress, if force_progress is 1 (ie. --progress).
 981         *   . Don't report progress, if force_progress is 0 (ie. --no-progress).
 982         *   . Don't report progress, if verbosity < 0 (ie. -q/--quiet ).
 983         *   . Report progress if isatty(2) is 1.
 984         **/
 985        if (force_progress >= 0)
 986                transport->progress = !!force_progress;
 987        else
 988                transport->progress = verbosity >= 0 && isatty(2);
 989}
 990
 991static void die_with_unpushed_submodules(struct string_list *needs_pushing)
 992{
 993        int i;
 994
 995        fprintf(stderr, _("The following submodule paths contain changes that can\n"
 996                        "not be found on any remote:\n"));
 997        for (i = 0; i < needs_pushing->nr; i++)
 998                fprintf(stderr, "  %s\n", needs_pushing->items[i].string);
 999        fprintf(stderr, _("\nPlease try\n\n"
1000                          "     git push --recurse-submodules=on-demand\n\n"
1001                          "or cd to the path and use\n\n"
1002                          "     git push\n\n"
1003                          "to push them to a remote.\n\n"));
1004
1005        string_list_clear(needs_pushing, 0);
1006
1007        die(_("Aborting."));
1008}
1009
1010static int run_pre_push_hook(struct transport *transport,
1011                             struct ref *remote_refs)
1012{
1013        int ret = 0, x;
1014        struct ref *r;
1015        struct child_process proc = CHILD_PROCESS_INIT;
1016        struct strbuf buf;
1017        const char *argv[4];
1018
1019        if (!(argv[0] = find_hook("pre-push")))
1020                return 0;
1021
1022        argv[1] = transport->remote->name;
1023        argv[2] = transport->url;
1024        argv[3] = NULL;
1025
1026        proc.argv = argv;
1027        proc.in = -1;
1028
1029        if (start_command(&proc)) {
1030                finish_command(&proc);
1031                return -1;
1032        }
1033
1034        sigchain_push(SIGPIPE, SIG_IGN);
1035
1036        strbuf_init(&buf, 256);
1037
1038        for (r = remote_refs; r; r = r->next) {
1039                if (!r->peer_ref) continue;
1040                if (r->status == REF_STATUS_REJECT_NONFASTFORWARD) continue;
1041                if (r->status == REF_STATUS_REJECT_STALE) continue;
1042                if (r->status == REF_STATUS_UPTODATE) continue;
1043
1044                strbuf_reset(&buf);
1045                strbuf_addf( &buf, "%s %s %s %s\n",
1046                         r->peer_ref->name, oid_to_hex(&r->new_oid),
1047                         r->name, oid_to_hex(&r->old_oid));
1048
1049                if (write_in_full(proc.in, buf.buf, buf.len) < 0) {
1050                        /* We do not mind if a hook does not read all refs. */
1051                        if (errno != EPIPE)
1052                                ret = -1;
1053                        break;
1054                }
1055        }
1056
1057        strbuf_release(&buf);
1058
1059        x = close(proc.in);
1060        if (!ret)
1061                ret = x;
1062
1063        sigchain_pop(SIGPIPE);
1064
1065        x = finish_command(&proc);
1066        if (!ret)
1067                ret = x;
1068
1069        return ret;
1070}
1071
1072int transport_push(struct transport *transport,
1073                   struct refspec *rs, int flags,
1074                   unsigned int *reject_reasons)
1075{
1076        *reject_reasons = 0;
1077
1078        if (transport_color_config() < 0)
1079                return -1;
1080
1081        if (transport->vtable->push_refs) {
1082                struct ref *remote_refs;
1083                struct ref *local_refs = get_local_heads();
1084                int match_flags = MATCH_REFS_NONE;
1085                int verbose = (transport->verbose > 0);
1086                int quiet = (transport->verbose < 0);
1087                int porcelain = flags & TRANSPORT_PUSH_PORCELAIN;
1088                int pretend = flags & TRANSPORT_PUSH_DRY_RUN;
1089                int push_ret, ret, err;
1090                struct argv_array ref_prefixes = ARGV_ARRAY_INIT;
1091                int i;
1092
1093                if (check_push_refs(local_refs, rs->raw_nr, rs->raw) < 0)
1094                        return -1;
1095
1096                for (i = 0; i < rs->nr; i++) {
1097                        const struct refspec_item *item = &rs->items[i];
1098                        const char *prefix = NULL;
1099
1100                        if (item->dst)
1101                                prefix = item->dst;
1102                        else if (item->src && !item->exact_sha1)
1103                                prefix = item->src;
1104
1105                        if (prefix) {
1106                                const char *glob = strchr(prefix, '*');
1107                                if (glob)
1108                                        argv_array_pushf(&ref_prefixes, "%.*s",
1109                                                         (int)(glob - prefix),
1110                                                         prefix);
1111                                else
1112                                        expand_ref_prefix(&ref_prefixes, prefix);
1113                        }
1114                }
1115
1116                remote_refs = transport->vtable->get_refs_list(transport, 1,
1117                                                               &ref_prefixes);
1118
1119                argv_array_clear(&ref_prefixes);
1120
1121                if (flags & TRANSPORT_PUSH_ALL)
1122                        match_flags |= MATCH_REFS_ALL;
1123                if (flags & TRANSPORT_PUSH_MIRROR)
1124                        match_flags |= MATCH_REFS_MIRROR;
1125                if (flags & TRANSPORT_PUSH_PRUNE)
1126                        match_flags |= MATCH_REFS_PRUNE;
1127                if (flags & TRANSPORT_PUSH_FOLLOW_TAGS)
1128                        match_flags |= MATCH_REFS_FOLLOW_TAGS;
1129
1130                if (match_push_refs(local_refs, &remote_refs,
1131                                    rs->raw_nr, rs->raw, match_flags)) {
1132                        return -1;
1133                }
1134
1135                if (transport->smart_options &&
1136                    transport->smart_options->cas &&
1137                    !is_empty_cas(transport->smart_options->cas))
1138                        apply_push_cas(transport->smart_options->cas,
1139                                       transport->remote, remote_refs);
1140
1141                set_ref_status_for_push(remote_refs,
1142                        flags & TRANSPORT_PUSH_MIRROR,
1143                        flags & TRANSPORT_PUSH_FORCE);
1144
1145                if (!(flags & TRANSPORT_PUSH_NO_HOOK))
1146                        if (run_pre_push_hook(transport, remote_refs))
1147                                return -1;
1148
1149                if ((flags & (TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND |
1150                              TRANSPORT_RECURSE_SUBMODULES_ONLY)) &&
1151                    !is_bare_repository()) {
1152                        struct ref *ref = remote_refs;
1153                        struct oid_array commits = OID_ARRAY_INIT;
1154
1155                        for (; ref; ref = ref->next)
1156                                if (!is_null_oid(&ref->new_oid))
1157                                        oid_array_append(&commits,
1158                                                          &ref->new_oid);
1159
1160                        if (!push_unpushed_submodules(&commits,
1161                                                      transport->remote,
1162                                                      rs->raw, rs->raw_nr,
1163                                                      transport->push_options,
1164                                                      pretend)) {
1165                                oid_array_clear(&commits);
1166                                die("Failed to push all needed submodules!");
1167                        }
1168                        oid_array_clear(&commits);
1169                }
1170
1171                if (((flags & TRANSPORT_RECURSE_SUBMODULES_CHECK) ||
1172                     ((flags & (TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND |
1173                                TRANSPORT_RECURSE_SUBMODULES_ONLY)) &&
1174                      !pretend)) && !is_bare_repository()) {
1175                        struct ref *ref = remote_refs;
1176                        struct string_list needs_pushing = STRING_LIST_INIT_DUP;
1177                        struct oid_array commits = OID_ARRAY_INIT;
1178
1179                        for (; ref; ref = ref->next)
1180                                if (!is_null_oid(&ref->new_oid))
1181                                        oid_array_append(&commits,
1182                                                          &ref->new_oid);
1183
1184                        if (find_unpushed_submodules(&commits, transport->remote->name,
1185                                                &needs_pushing)) {
1186                                oid_array_clear(&commits);
1187                                die_with_unpushed_submodules(&needs_pushing);
1188                        }
1189                        string_list_clear(&needs_pushing, 0);
1190                        oid_array_clear(&commits);
1191                }
1192
1193                if (!(flags & TRANSPORT_RECURSE_SUBMODULES_ONLY))
1194                        push_ret = transport->vtable->push_refs(transport, remote_refs, flags);
1195                else
1196                        push_ret = 0;
1197                err = push_had_errors(remote_refs);
1198                ret = push_ret | err;
1199
1200                if (!quiet || err)
1201                        transport_print_push_status(transport->url, remote_refs,
1202                                        verbose | porcelain, porcelain,
1203                                        reject_reasons);
1204
1205                if (flags & TRANSPORT_PUSH_SET_UPSTREAM)
1206                        set_upstreams(transport, remote_refs, pretend);
1207
1208                if (!(flags & (TRANSPORT_PUSH_DRY_RUN |
1209                               TRANSPORT_RECURSE_SUBMODULES_ONLY))) {
1210                        struct ref *ref;
1211                        for (ref = remote_refs; ref; ref = ref->next)
1212                                transport_update_tracking_ref(transport->remote, ref, verbose);
1213                }
1214
1215                if (porcelain && !push_ret)
1216                        puts("Done");
1217                else if (!quiet && !ret && !transport_refs_pushed(remote_refs))
1218                        fprintf(stderr, "Everything up-to-date\n");
1219
1220                return ret;
1221        }
1222        return 1;
1223}
1224
1225const struct ref *transport_get_remote_refs(struct transport *transport,
1226                                            const struct argv_array *ref_prefixes)
1227{
1228        if (!transport->got_remote_refs) {
1229                transport->remote_refs =
1230                        transport->vtable->get_refs_list(transport, 0,
1231                                                         ref_prefixes);
1232                transport->got_remote_refs = 1;
1233        }
1234
1235        return transport->remote_refs;
1236}
1237
1238int transport_fetch_refs(struct transport *transport, struct ref *refs)
1239{
1240        int rc;
1241        int nr_heads = 0, nr_alloc = 0, nr_refs = 0;
1242        struct ref **heads = NULL;
1243        struct ref *rm;
1244
1245        for (rm = refs; rm; rm = rm->next) {
1246                nr_refs++;
1247                if (rm->peer_ref &&
1248                    !is_null_oid(&rm->old_oid) &&
1249                    !oidcmp(&rm->peer_ref->old_oid, &rm->old_oid))
1250                        continue;
1251                ALLOC_GROW(heads, nr_heads + 1, nr_alloc);
1252                heads[nr_heads++] = rm;
1253        }
1254
1255        if (!nr_heads) {
1256                /*
1257                 * When deepening of a shallow repository is requested,
1258                 * then local and remote refs are likely to still be equal.
1259                 * Just feed them all to the fetch method in that case.
1260                 * This condition shouldn't be met in a non-deepening fetch
1261                 * (see builtin/fetch.c:quickfetch()).
1262                 */
1263                ALLOC_ARRAY(heads, nr_refs);
1264                for (rm = refs; rm; rm = rm->next)
1265                        heads[nr_heads++] = rm;
1266        }
1267
1268        rc = transport->vtable->fetch(transport, nr_heads, heads);
1269
1270        free(heads);
1271        return rc;
1272}
1273
1274void transport_unlock_pack(struct transport *transport)
1275{
1276        if (transport->pack_lockfile) {
1277                unlink_or_warn(transport->pack_lockfile);
1278                FREE_AND_NULL(transport->pack_lockfile);
1279        }
1280}
1281
1282int transport_connect(struct transport *transport, const char *name,
1283                      const char *exec, int fd[2])
1284{
1285        if (transport->vtable->connect)
1286                return transport->vtable->connect(transport, name, exec, fd);
1287        else
1288                die("Operation not supported by protocol");
1289}
1290
1291int transport_disconnect(struct transport *transport)
1292{
1293        int ret = 0;
1294        if (transport->vtable->disconnect)
1295                ret = transport->vtable->disconnect(transport);
1296        free(transport);
1297        return ret;
1298}
1299
1300/*
1301 * Strip username (and password) from a URL and return
1302 * it in a newly allocated string.
1303 */
1304char *transport_anonymize_url(const char *url)
1305{
1306        char *scheme_prefix, *anon_part;
1307        size_t anon_len, prefix_len = 0;
1308
1309        anon_part = strchr(url, '@');
1310        if (url_is_local_not_ssh(url) || !anon_part)
1311                goto literal_copy;
1312
1313        anon_len = strlen(++anon_part);
1314        scheme_prefix = strstr(url, "://");
1315        if (!scheme_prefix) {
1316                if (!strchr(anon_part, ':'))
1317                        /* cannot be "me@there:/path/name" */
1318                        goto literal_copy;
1319        } else {
1320                const char *cp;
1321                /* make sure scheme is reasonable */
1322                for (cp = url; cp < scheme_prefix; cp++) {
1323                        switch (*cp) {
1324                                /* RFC 1738 2.1 */
1325                        case '+': case '.': case '-':
1326                                break; /* ok */
1327                        default:
1328                                if (isalnum(*cp))
1329                                        break;
1330                                /* it isn't */
1331                                goto literal_copy;
1332                        }
1333                }
1334                /* @ past the first slash does not count */
1335                cp = strchr(scheme_prefix + 3, '/');
1336                if (cp && cp < anon_part)
1337                        goto literal_copy;
1338                prefix_len = scheme_prefix - url + 3;
1339        }
1340        return xstrfmt("%.*s%.*s", (int)prefix_len, url,
1341                       (int)anon_len, anon_part);
1342literal_copy:
1343        return xstrdup(url);
1344}
1345
1346static void read_alternate_refs(const char *path,
1347                                alternate_ref_fn *cb,
1348                                void *data)
1349{
1350        struct child_process cmd = CHILD_PROCESS_INIT;
1351        struct strbuf line = STRBUF_INIT;
1352        FILE *fh;
1353
1354        cmd.git_cmd = 1;
1355        argv_array_pushf(&cmd.args, "--git-dir=%s", path);
1356        argv_array_push(&cmd.args, "for-each-ref");
1357        argv_array_push(&cmd.args, "--format=%(objectname) %(refname)");
1358        cmd.env = local_repo_env;
1359        cmd.out = -1;
1360
1361        if (start_command(&cmd))
1362                return;
1363
1364        fh = xfdopen(cmd.out, "r");
1365        while (strbuf_getline_lf(&line, fh) != EOF) {
1366                struct object_id oid;
1367
1368                if (get_oid_hex(line.buf, &oid) ||
1369                    line.buf[GIT_SHA1_HEXSZ] != ' ') {
1370                        warning("invalid line while parsing alternate refs: %s",
1371                                line.buf);
1372                        break;
1373                }
1374
1375                cb(line.buf + GIT_SHA1_HEXSZ + 1, &oid, data);
1376        }
1377
1378        fclose(fh);
1379        finish_command(&cmd);
1380}
1381
1382struct alternate_refs_data {
1383        alternate_ref_fn *fn;
1384        void *data;
1385};
1386
1387static int refs_from_alternate_cb(struct alternate_object_database *e,
1388                                  void *data)
1389{
1390        struct strbuf path = STRBUF_INIT;
1391        size_t base_len;
1392        struct alternate_refs_data *cb = data;
1393
1394        if (!strbuf_realpath(&path, e->path, 0))
1395                goto out;
1396        if (!strbuf_strip_suffix(&path, "/objects"))
1397                goto out;
1398        base_len = path.len;
1399
1400        /* Is this a git repository with refs? */
1401        strbuf_addstr(&path, "/refs");
1402        if (!is_directory(path.buf))
1403                goto out;
1404        strbuf_setlen(&path, base_len);
1405
1406        read_alternate_refs(path.buf, cb->fn, cb->data);
1407
1408out:
1409        strbuf_release(&path);
1410        return 0;
1411}
1412
1413void for_each_alternate_ref(alternate_ref_fn fn, void *data)
1414{
1415        struct alternate_refs_data cb;
1416        cb.fn = fn;
1417        cb.data = data;
1418        foreach_alt_odb(refs_from_alternate_cb, &cb);
1419}