Andrew's git / gitweb.git / transport.c
?
transport.con commit git-commit-graph.txt: typeset more in monospace (d59a916)
   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        args.negotiation_tips = data->options.negotiation_tips;
 322
 323        if (!data->got_remote_heads)
 324                refs_tmp = get_refs_via_connect(transport, 0, NULL);
 325
 326        switch (data->version) {
 327        case protocol_v2:
 328                refs = fetch_pack(&args, data->fd, data->conn,
 329                                  refs_tmp ? refs_tmp : transport->remote_refs,
 330                                  dest, to_fetch, nr_heads, &data->shallow,
 331                                  &transport->pack_lockfile, data->version);
 332                break;
 333        case protocol_v1:
 334        case protocol_v0:
 335                refs = fetch_pack(&args, data->fd, data->conn,
 336                                  refs_tmp ? refs_tmp : transport->remote_refs,
 337                                  dest, to_fetch, nr_heads, &data->shallow,
 338                                  &transport->pack_lockfile, data->version);
 339                break;
 340        case protocol_unknown_version:
 341                BUG("unknown protocol version");
 342        }
 343
 344        close(data->fd[0]);
 345        close(data->fd[1]);
 346        if (finish_connect(data->conn))
 347                ret = -1;
 348        data->conn = NULL;
 349        data->got_remote_heads = 0;
 350        data->options.self_contained_and_connected =
 351                args.self_contained_and_connected;
 352        data->options.connectivity_checked = args.connectivity_checked;
 353
 354        if (refs == NULL)
 355                ret = -1;
 356        if (report_unmatched_refs(to_fetch, nr_heads))
 357                ret = -1;
 358
 359        free_refs(refs_tmp);
 360        free_refs(refs);
 361        free(dest);
 362        return ret;
 363}
 364
 365static int push_had_errors(struct ref *ref)
 366{
 367        for (; ref; ref = ref->next) {
 368                switch (ref->status) {
 369                case REF_STATUS_NONE:
 370                case REF_STATUS_UPTODATE:
 371                case REF_STATUS_OK:
 372                        break;
 373                default:
 374                        return 1;
 375                }
 376        }
 377        return 0;
 378}
 379
 380int transport_refs_pushed(struct ref *ref)
 381{
 382        for (; ref; ref = ref->next) {
 383                switch(ref->status) {
 384                case REF_STATUS_NONE:
 385                case REF_STATUS_UPTODATE:
 386                        break;
 387                default:
 388                        return 1;
 389                }
 390        }
 391        return 0;
 392}
 393
 394void transport_update_tracking_ref(struct remote *remote, struct ref *ref, int verbose)
 395{
 396        struct refspec_item rs;
 397
 398        if (ref->status != REF_STATUS_OK && ref->status != REF_STATUS_UPTODATE)
 399                return;
 400
 401        rs.src = ref->name;
 402        rs.dst = NULL;
 403
 404        if (!remote_find_tracking(remote, &rs)) {
 405                if (verbose)
 406                        fprintf(stderr, "updating local tracking ref '%s'\n", rs.dst);
 407                if (ref->deletion) {
 408                        delete_ref(NULL, rs.dst, NULL, 0);
 409                } else
 410                        update_ref("update by push", rs.dst, &ref->new_oid,
 411                                   NULL, 0, 0);
 412                free(rs.dst);
 413        }
 414}
 415
 416static void print_ref_status(char flag, const char *summary,
 417                             struct ref *to, struct ref *from, const char *msg,
 418                             int porcelain, int summary_width)
 419{
 420        if (porcelain) {
 421                if (from)
 422                        fprintf(stdout, "%c\t%s:%s\t", flag, from->name, to->name);
 423                else
 424                        fprintf(stdout, "%c\t:%s\t", flag, to->name);
 425                if (msg)
 426                        fprintf(stdout, "%s (%s)\n", summary, msg);
 427                else
 428                        fprintf(stdout, "%s\n", summary);
 429        } else {
 430                const char *red = "", *reset = "";
 431                if (push_had_errors(to)) {
 432                        red = transport_get_color(TRANSPORT_COLOR_REJECTED);
 433                        reset = transport_get_color(TRANSPORT_COLOR_RESET);
 434                }
 435                fprintf(stderr, " %s%c %-*s%s ", red, flag, summary_width,
 436                        summary, reset);
 437                if (from)
 438                        fprintf(stderr, "%s -> %s", prettify_refname(from->name), prettify_refname(to->name));
 439                else
 440                        fputs(prettify_refname(to->name), stderr);
 441                if (msg) {
 442                        fputs(" (", stderr);
 443                        fputs(msg, stderr);
 444                        fputc(')', stderr);
 445                }
 446                fputc('\n', stderr);
 447        }
 448}
 449
 450static void print_ok_ref_status(struct ref *ref, int porcelain, int summary_width)
 451{
 452        if (ref->deletion)
 453                print_ref_status('-', "[deleted]", ref, NULL, NULL,
 454                                 porcelain, summary_width);
 455        else if (is_null_oid(&ref->old_oid))
 456                print_ref_status('*',
 457                        (starts_with(ref->name, "refs/tags/") ? "[new tag]" :
 458                        "[new branch]"),
 459                        ref, ref->peer_ref, NULL, porcelain, summary_width);
 460        else {
 461                struct strbuf quickref = STRBUF_INIT;
 462                char type;
 463                const char *msg;
 464
 465                strbuf_add_unique_abbrev(&quickref, &ref->old_oid,
 466                                         DEFAULT_ABBREV);
 467                if (ref->forced_update) {
 468                        strbuf_addstr(&quickref, "...");
 469                        type = '+';
 470                        msg = "forced update";
 471                } else {
 472                        strbuf_addstr(&quickref, "..");
 473                        type = ' ';
 474                        msg = NULL;
 475                }
 476                strbuf_add_unique_abbrev(&quickref, &ref->new_oid,
 477                                         DEFAULT_ABBREV);
 478
 479                print_ref_status(type, quickref.buf, ref, ref->peer_ref, msg,
 480                                 porcelain, summary_width);
 481                strbuf_release(&quickref);
 482        }
 483}
 484
 485static int print_one_push_status(struct ref *ref, const char *dest, int count,
 486                                 int porcelain, int summary_width)
 487{
 488        if (!count) {
 489                char *url = transport_anonymize_url(dest);
 490                fprintf(porcelain ? stdout : stderr, "To %s\n", url);
 491                free(url);
 492        }
 493
 494        switch(ref->status) {
 495        case REF_STATUS_NONE:
 496                print_ref_status('X', "[no match]", ref, NULL, NULL,
 497                                 porcelain, summary_width);
 498                break;
 499        case REF_STATUS_REJECT_NODELETE:
 500                print_ref_status('!', "[rejected]", ref, NULL,
 501                                 "remote does not support deleting refs",
 502                                 porcelain, summary_width);
 503                break;
 504        case REF_STATUS_UPTODATE:
 505                print_ref_status('=', "[up to date]", ref,
 506                                 ref->peer_ref, NULL, porcelain, summary_width);
 507                break;
 508        case REF_STATUS_REJECT_NONFASTFORWARD:
 509                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 510                                 "non-fast-forward", porcelain, summary_width);
 511                break;
 512        case REF_STATUS_REJECT_ALREADY_EXISTS:
 513                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 514                                 "already exists", porcelain, summary_width);
 515                break;
 516        case REF_STATUS_REJECT_FETCH_FIRST:
 517                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 518                                 "fetch first", porcelain, summary_width);
 519                break;
 520        case REF_STATUS_REJECT_NEEDS_FORCE:
 521                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 522                                 "needs force", porcelain, summary_width);
 523                break;
 524        case REF_STATUS_REJECT_STALE:
 525                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 526                                 "stale info", porcelain, summary_width);
 527                break;
 528        case REF_STATUS_REJECT_SHALLOW:
 529                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 530                                 "new shallow roots not allowed",
 531                                 porcelain, summary_width);
 532                break;
 533        case REF_STATUS_REMOTE_REJECT:
 534                print_ref_status('!', "[remote rejected]", ref,
 535                                 ref->deletion ? NULL : ref->peer_ref,
 536                                 ref->remote_status, porcelain, summary_width);
 537                break;
 538        case REF_STATUS_EXPECTING_REPORT:
 539                print_ref_status('!', "[remote failure]", ref,
 540                                 ref->deletion ? NULL : ref->peer_ref,
 541                                 "remote failed to report status",
 542                                 porcelain, summary_width);
 543                break;
 544        case REF_STATUS_ATOMIC_PUSH_FAILED:
 545                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 546                                 "atomic push failed", porcelain, summary_width);
 547                break;
 548        case REF_STATUS_OK:
 549                print_ok_ref_status(ref, porcelain, summary_width);
 550                break;
 551        }
 552
 553        return 1;
 554}
 555
 556static int measure_abbrev(const struct object_id *oid, int sofar)
 557{
 558        char hex[GIT_MAX_HEXSZ + 1];
 559        int w = find_unique_abbrev_r(hex, oid, DEFAULT_ABBREV);
 560
 561        return (w < sofar) ? sofar : w;
 562}
 563
 564int transport_summary_width(const struct ref *refs)
 565{
 566        int maxw = -1;
 567
 568        for (; refs; refs = refs->next) {
 569                maxw = measure_abbrev(&refs->old_oid, maxw);
 570                maxw = measure_abbrev(&refs->new_oid, maxw);
 571        }
 572        if (maxw < 0)
 573                maxw = FALLBACK_DEFAULT_ABBREV;
 574        return (2 * maxw + 3);
 575}
 576
 577void transport_print_push_status(const char *dest, struct ref *refs,
 578                                  int verbose, int porcelain, unsigned int *reject_reasons)
 579{
 580        struct ref *ref;
 581        int n = 0;
 582        char *head;
 583        int summary_width = transport_summary_width(refs);
 584
 585        if (transport_color_config() < 0)
 586                warning(_("could not parse transport.color.* config"));
 587
 588        head = resolve_refdup("HEAD", RESOLVE_REF_READING, NULL, NULL);
 589
 590        if (verbose) {
 591                for (ref = refs; ref; ref = ref->next)
 592                        if (ref->status == REF_STATUS_UPTODATE)
 593                                n += print_one_push_status(ref, dest, n,
 594                                                           porcelain, summary_width);
 595        }
 596
 597        for (ref = refs; ref; ref = ref->next)
 598                if (ref->status == REF_STATUS_OK)
 599                        n += print_one_push_status(ref, dest, n,
 600                                                   porcelain, summary_width);
 601
 602        *reject_reasons = 0;
 603        for (ref = refs; ref; ref = ref->next) {
 604                if (ref->status != REF_STATUS_NONE &&
 605                    ref->status != REF_STATUS_UPTODATE &&
 606                    ref->status != REF_STATUS_OK)
 607                        n += print_one_push_status(ref, dest, n,
 608                                                   porcelain, summary_width);
 609                if (ref->status == REF_STATUS_REJECT_NONFASTFORWARD) {
 610                        if (head != NULL && !strcmp(head, ref->name))
 611                                *reject_reasons |= REJECT_NON_FF_HEAD;
 612                        else
 613                                *reject_reasons |= REJECT_NON_FF_OTHER;
 614                } else if (ref->status == REF_STATUS_REJECT_ALREADY_EXISTS) {
 615                        *reject_reasons |= REJECT_ALREADY_EXISTS;
 616                } else if (ref->status == REF_STATUS_REJECT_FETCH_FIRST) {
 617                        *reject_reasons |= REJECT_FETCH_FIRST;
 618                } else if (ref->status == REF_STATUS_REJECT_NEEDS_FORCE) {
 619                        *reject_reasons |= REJECT_NEEDS_FORCE;
 620                }
 621        }
 622        free(head);
 623}
 624
 625static int git_transport_push(struct transport *transport, struct ref *remote_refs, int flags)
 626{
 627        struct git_transport_data *data = transport->data;
 628        struct send_pack_args args;
 629        int ret = 0;
 630
 631        if (transport_color_config() < 0)
 632                return -1;
 633
 634        if (!data->got_remote_heads)
 635                get_refs_via_connect(transport, 1, NULL);
 636
 637        memset(&args, 0, sizeof(args));
 638        args.send_mirror = !!(flags & TRANSPORT_PUSH_MIRROR);
 639        args.force_update = !!(flags & TRANSPORT_PUSH_FORCE);
 640        args.use_thin_pack = data->options.thin;
 641        args.verbose = (transport->verbose > 0);
 642        args.quiet = (transport->verbose < 0);
 643        args.progress = transport->progress;
 644        args.dry_run = !!(flags & TRANSPORT_PUSH_DRY_RUN);
 645        args.porcelain = !!(flags & TRANSPORT_PUSH_PORCELAIN);
 646        args.atomic = !!(flags & TRANSPORT_PUSH_ATOMIC);
 647        args.push_options = transport->push_options;
 648        args.url = transport->url;
 649
 650        if (flags & TRANSPORT_PUSH_CERT_ALWAYS)
 651                args.push_cert = SEND_PACK_PUSH_CERT_ALWAYS;
 652        else if (flags & TRANSPORT_PUSH_CERT_IF_ASKED)
 653                args.push_cert = SEND_PACK_PUSH_CERT_IF_ASKED;
 654        else
 655                args.push_cert = SEND_PACK_PUSH_CERT_NEVER;
 656
 657        switch (data->version) {
 658        case protocol_v2:
 659                die(_("support for protocol v2 not implemented yet"));
 660                break;
 661        case protocol_v1:
 662        case protocol_v0:
 663                ret = send_pack(&args, data->fd, data->conn, remote_refs,
 664                                &data->extra_have);
 665                break;
 666        case protocol_unknown_version:
 667                BUG("unknown protocol version");
 668        }
 669
 670        close(data->fd[1]);
 671        close(data->fd[0]);
 672        ret |= finish_connect(data->conn);
 673        data->conn = NULL;
 674        data->got_remote_heads = 0;
 675
 676        return ret;
 677}
 678
 679static int connect_git(struct transport *transport, const char *name,
 680                       const char *executable, int fd[2])
 681{
 682        struct git_transport_data *data = transport->data;
 683        data->conn = git_connect(data->fd, transport->url,
 684                                 executable, 0);
 685        fd[0] = data->fd[0];
 686        fd[1] = data->fd[1];
 687        return 0;
 688}
 689
 690static int disconnect_git(struct transport *transport)
 691{
 692        struct git_transport_data *data = transport->data;
 693        if (data->conn) {
 694                if (data->got_remote_heads)
 695                        packet_flush(data->fd[1]);
 696                close(data->fd[0]);
 697                close(data->fd[1]);
 698                finish_connect(data->conn);
 699        }
 700
 701        free(data);
 702        return 0;
 703}
 704
 705static struct transport_vtable taken_over_vtable = {
 706        NULL,
 707        get_refs_via_connect,
 708        fetch_refs_via_pack,
 709        git_transport_push,
 710        NULL,
 711        disconnect_git
 712};
 713
 714void transport_take_over(struct transport *transport,
 715                         struct child_process *child)
 716{
 717        struct git_transport_data *data;
 718
 719        if (!transport->smart_options)
 720                BUG("taking over transport requires non-NULL "
 721                    "smart_options field.");
 722
 723        data = xcalloc(1, sizeof(*data));
 724        data->options = *transport->smart_options;
 725        data->conn = child;
 726        data->fd[0] = data->conn->out;
 727        data->fd[1] = data->conn->in;
 728        data->got_remote_heads = 0;
 729        transport->data = data;
 730
 731        transport->vtable = &taken_over_vtable;
 732        transport->smart_options = &(data->options);
 733
 734        transport->cannot_reuse = 1;
 735}
 736
 737static int is_file(const char *url)
 738{
 739        struct stat buf;
 740        if (stat(url, &buf))
 741                return 0;
 742        return S_ISREG(buf.st_mode);
 743}
 744
 745static int external_specification_len(const char *url)
 746{
 747        return strchr(url, ':') - url;
 748}
 749
 750static const struct string_list *protocol_whitelist(void)
 751{
 752        static int enabled = -1;
 753        static struct string_list allowed = STRING_LIST_INIT_DUP;
 754
 755        if (enabled < 0) {
 756                const char *v = getenv("GIT_ALLOW_PROTOCOL");
 757                if (v) {
 758                        string_list_split(&allowed, v, ':', -1);
 759                        string_list_sort(&allowed);
 760                        enabled = 1;
 761                } else {
 762                        enabled = 0;
 763                }
 764        }
 765
 766        return enabled ? &allowed : NULL;
 767}
 768
 769enum protocol_allow_config {
 770        PROTOCOL_ALLOW_NEVER = 0,
 771        PROTOCOL_ALLOW_USER_ONLY,
 772        PROTOCOL_ALLOW_ALWAYS
 773};
 774
 775static enum protocol_allow_config parse_protocol_config(const char *key,
 776                                                        const char *value)
 777{
 778        if (!strcasecmp(value, "always"))
 779                return PROTOCOL_ALLOW_ALWAYS;
 780        else if (!strcasecmp(value, "never"))
 781                return PROTOCOL_ALLOW_NEVER;
 782        else if (!strcasecmp(value, "user"))
 783                return PROTOCOL_ALLOW_USER_ONLY;
 784
 785        die(_("unknown value for config '%s': %s"), key, value);
 786}
 787
 788static enum protocol_allow_config get_protocol_config(const char *type)
 789{
 790        char *key = xstrfmt("protocol.%s.allow", type);
 791        char *value;
 792
 793        /* first check the per-protocol config */
 794        if (!git_config_get_string(key, &value)) {
 795                enum protocol_allow_config ret =
 796                        parse_protocol_config(key, value);
 797                free(key);
 798                free(value);
 799                return ret;
 800        }
 801        free(key);
 802
 803        /* if defined, fallback to user-defined default for unknown protocols */
 804        if (!git_config_get_string("protocol.allow", &value)) {
 805                enum protocol_allow_config ret =
 806                        parse_protocol_config("protocol.allow", value);
 807                free(value);
 808                return ret;
 809        }
 810
 811        /* fallback to built-in defaults */
 812        /* known safe */
 813        if (!strcmp(type, "http") ||
 814            !strcmp(type, "https") ||
 815            !strcmp(type, "git") ||
 816            !strcmp(type, "ssh") ||
 817            !strcmp(type, "file"))
 818                return PROTOCOL_ALLOW_ALWAYS;
 819
 820        /* known scary; err on the side of caution */
 821        if (!strcmp(type, "ext"))
 822                return PROTOCOL_ALLOW_NEVER;
 823
 824        /* unknown; by default let them be used only directly by the user */
 825        return PROTOCOL_ALLOW_USER_ONLY;
 826}
 827
 828int is_transport_allowed(const char *type, int from_user)
 829{
 830        const struct string_list *whitelist = protocol_whitelist();
 831        if (whitelist)
 832                return string_list_has_string(whitelist, type);
 833
 834        switch (get_protocol_config(type)) {
 835        case PROTOCOL_ALLOW_ALWAYS:
 836                return 1;
 837        case PROTOCOL_ALLOW_NEVER:
 838                return 0;
 839        case PROTOCOL_ALLOW_USER_ONLY:
 840                if (from_user < 0)
 841                        from_user = git_env_bool("GIT_PROTOCOL_FROM_USER", 1);
 842                return from_user;
 843        }
 844
 845        BUG("invalid protocol_allow_config type");
 846}
 847
 848void transport_check_allowed(const char *type)
 849{
 850        if (!is_transport_allowed(type, -1))
 851                die(_("transport '%s' not allowed"), type);
 852}
 853
 854static struct transport_vtable bundle_vtable = {
 855        NULL,
 856        get_refs_from_bundle,
 857        fetch_refs_from_bundle,
 858        NULL,
 859        NULL,
 860        close_bundle
 861};
 862
 863static struct transport_vtable builtin_smart_vtable = {
 864        NULL,
 865        get_refs_via_connect,
 866        fetch_refs_via_pack,
 867        git_transport_push,
 868        connect_git,
 869        disconnect_git
 870};
 871
 872struct transport *transport_get(struct remote *remote, const char *url)
 873{
 874        const char *helper;
 875        struct transport *ret = xcalloc(1, sizeof(*ret));
 876
 877        ret->progress = isatty(2);
 878
 879        if (!remote)
 880                BUG("No remote provided to transport_get()");
 881
 882        ret->got_remote_refs = 0;
 883        ret->remote = remote;
 884        helper = remote->foreign_vcs;
 885
 886        if (!url && remote->url)
 887                url = remote->url[0];
 888        ret->url = url;
 889
 890        /* maybe it is a foreign URL? */
 891        if (url) {
 892                const char *p = url;
 893
 894                while (is_urlschemechar(p == url, *p))
 895                        p++;
 896                if (starts_with(p, "::"))
 897                        helper = xstrndup(url, p - url);
 898        }
 899
 900        if (helper) {
 901                transport_helper_init(ret, helper);
 902        } else if (starts_with(url, "rsync:")) {
 903                die(_("git-over-rsync is no longer supported"));
 904        } else if (url_is_local_not_ssh(url) && is_file(url) && is_bundle(url, 1)) {
 905                struct bundle_transport_data *data = xcalloc(1, sizeof(*data));
 906                transport_check_allowed("file");
 907                ret->data = data;
 908                ret->vtable = &bundle_vtable;
 909                ret->smart_options = NULL;
 910        } else if (!is_url(url)
 911                || starts_with(url, "file://")
 912                || starts_with(url, "git://")
 913                || starts_with(url, "ssh://")
 914                || starts_with(url, "git+ssh://") /* deprecated - do not use */
 915                || starts_with(url, "ssh+git://") /* deprecated - do not use */
 916                ) {
 917                /*
 918                 * These are builtin smart transports; "allowed" transports
 919                 * will be checked individually in git_connect.
 920                 */
 921                struct git_transport_data *data = xcalloc(1, sizeof(*data));
 922                ret->data = data;
 923                ret->vtable = &builtin_smart_vtable;
 924                ret->smart_options = &(data->options);
 925
 926                data->conn = NULL;
 927                data->got_remote_heads = 0;
 928        } else {
 929                /* Unknown protocol in URL. Pass to external handler. */
 930                int len = external_specification_len(url);
 931                char *handler = xmemdupz(url, len);
 932                transport_helper_init(ret, handler);
 933        }
 934
 935        if (ret->smart_options) {
 936                ret->smart_options->thin = 1;
 937                ret->smart_options->uploadpack = "git-upload-pack";
 938                if (remote->uploadpack)
 939                        ret->smart_options->uploadpack = remote->uploadpack;
 940                ret->smart_options->receivepack = "git-receive-pack";
 941                if (remote->receivepack)
 942                        ret->smart_options->receivepack = remote->receivepack;
 943        }
 944
 945        return ret;
 946}
 947
 948int transport_set_option(struct transport *transport,
 949                         const char *name, const char *value)
 950{
 951        int git_reports = 1, protocol_reports = 1;
 952
 953        if (transport->smart_options)
 954                git_reports = set_git_option(transport->smart_options,
 955                                             name, value);
 956
 957        if (transport->vtable->set_option)
 958                protocol_reports = transport->vtable->set_option(transport,
 959                                                                 name, value);
 960
 961        /* If either report is 0, report 0 (success). */
 962        if (!git_reports || !protocol_reports)
 963                return 0;
 964        /* If either reports -1 (invalid value), report -1. */
 965        if ((git_reports == -1) || (protocol_reports == -1))
 966                return -1;
 967        /* Otherwise if both report unknown, report unknown. */
 968        return 1;
 969}
 970
 971void transport_set_verbosity(struct transport *transport, int verbosity,
 972        int force_progress)
 973{
 974        if (verbosity >= 1)
 975                transport->verbose = verbosity <= 3 ? verbosity : 3;
 976        if (verbosity < 0)
 977                transport->verbose = -1;
 978
 979        /**
 980         * Rules used to determine whether to report progress (processing aborts
 981         * when a rule is satisfied):
 982         *
 983         *   . Report progress, if force_progress is 1 (ie. --progress).
 984         *   . Don't report progress, if force_progress is 0 (ie. --no-progress).
 985         *   . Don't report progress, if verbosity < 0 (ie. -q/--quiet ).
 986         *   . Report progress if isatty(2) is 1.
 987         **/
 988        if (force_progress >= 0)
 989                transport->progress = !!force_progress;
 990        else
 991                transport->progress = verbosity >= 0 && isatty(2);
 992}
 993
 994static void die_with_unpushed_submodules(struct string_list *needs_pushing)
 995{
 996        int i;
 997
 998        fprintf(stderr, _("The following submodule paths contain changes that can\n"
 999                        "not be found on any remote:\n"));
1000        for (i = 0; i < needs_pushing->nr; i++)
1001                fprintf(stderr, "  %s\n", needs_pushing->items[i].string);
1002        fprintf(stderr, _("\nPlease try\n\n"
1003                          "     git push --recurse-submodules=on-demand\n\n"
1004                          "or cd to the path and use\n\n"
1005                          "     git push\n\n"
1006                          "to push them to a remote.\n\n"));
1007
1008        string_list_clear(needs_pushing, 0);
1009
1010        die(_("Aborting."));
1011}
1012
1013static int run_pre_push_hook(struct transport *transport,
1014                             struct ref *remote_refs)
1015{
1016        int ret = 0, x;
1017        struct ref *r;
1018        struct child_process proc = CHILD_PROCESS_INIT;
1019        struct strbuf buf;
1020        const char *argv[4];
1021
1022        if (!(argv[0] = find_hook("pre-push")))
1023                return 0;
1024
1025        argv[1] = transport->remote->name;
1026        argv[2] = transport->url;
1027        argv[3] = NULL;
1028
1029        proc.argv = argv;
1030        proc.in = -1;
1031
1032        if (start_command(&proc)) {
1033                finish_command(&proc);
1034                return -1;
1035        }
1036
1037        sigchain_push(SIGPIPE, SIG_IGN);
1038
1039        strbuf_init(&buf, 256);
1040
1041        for (r = remote_refs; r; r = r->next) {
1042                if (!r->peer_ref) continue;
1043                if (r->status == REF_STATUS_REJECT_NONFASTFORWARD) continue;
1044                if (r->status == REF_STATUS_REJECT_STALE) continue;
1045                if (r->status == REF_STATUS_UPTODATE) continue;
1046
1047                strbuf_reset(&buf);
1048                strbuf_addf( &buf, "%s %s %s %s\n",
1049                         r->peer_ref->name, oid_to_hex(&r->new_oid),
1050                         r->name, oid_to_hex(&r->old_oid));
1051
1052                if (write_in_full(proc.in, buf.buf, buf.len) < 0) {
1053                        /* We do not mind if a hook does not read all refs. */
1054                        if (errno != EPIPE)
1055                                ret = -1;
1056                        break;
1057                }
1058        }
1059
1060        strbuf_release(&buf);
1061
1062        x = close(proc.in);
1063        if (!ret)
1064                ret = x;
1065
1066        sigchain_pop(SIGPIPE);
1067
1068        x = finish_command(&proc);
1069        if (!ret)
1070                ret = x;
1071
1072        return ret;
1073}
1074
1075int transport_push(struct transport *transport,
1076                   struct refspec *rs, int flags,
1077                   unsigned int *reject_reasons)
1078{
1079        *reject_reasons = 0;
1080
1081        if (transport_color_config() < 0)
1082                return -1;
1083
1084        if (transport->vtable->push_refs) {
1085                struct ref *remote_refs;
1086                struct ref *local_refs = get_local_heads();
1087                int match_flags = MATCH_REFS_NONE;
1088                int verbose = (transport->verbose > 0);
1089                int quiet = (transport->verbose < 0);
1090                int porcelain = flags & TRANSPORT_PUSH_PORCELAIN;
1091                int pretend = flags & TRANSPORT_PUSH_DRY_RUN;
1092                int push_ret, ret, err;
1093                struct argv_array ref_prefixes = ARGV_ARRAY_INIT;
1094
1095                if (check_push_refs(local_refs, rs) < 0)
1096                        return -1;
1097
1098                refspec_ref_prefixes(rs, &ref_prefixes);
1099
1100                remote_refs = transport->vtable->get_refs_list(transport, 1,
1101                                                               &ref_prefixes);
1102
1103                argv_array_clear(&ref_prefixes);
1104
1105                if (flags & TRANSPORT_PUSH_ALL)
1106                        match_flags |= MATCH_REFS_ALL;
1107                if (flags & TRANSPORT_PUSH_MIRROR)
1108                        match_flags |= MATCH_REFS_MIRROR;
1109                if (flags & TRANSPORT_PUSH_PRUNE)
1110                        match_flags |= MATCH_REFS_PRUNE;
1111                if (flags & TRANSPORT_PUSH_FOLLOW_TAGS)
1112                        match_flags |= MATCH_REFS_FOLLOW_TAGS;
1113
1114                if (match_push_refs(local_refs, &remote_refs, rs, match_flags))
1115                        return -1;
1116
1117                if (transport->smart_options &&
1118                    transport->smart_options->cas &&
1119                    !is_empty_cas(transport->smart_options->cas))
1120                        apply_push_cas(transport->smart_options->cas,
1121                                       transport->remote, remote_refs);
1122
1123                set_ref_status_for_push(remote_refs,
1124                        flags & TRANSPORT_PUSH_MIRROR,
1125                        flags & TRANSPORT_PUSH_FORCE);
1126
1127                if (!(flags & TRANSPORT_PUSH_NO_HOOK))
1128                        if (run_pre_push_hook(transport, remote_refs))
1129                                return -1;
1130
1131                if ((flags & (TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND |
1132                              TRANSPORT_RECURSE_SUBMODULES_ONLY)) &&
1133                    !is_bare_repository()) {
1134                        struct ref *ref = remote_refs;
1135                        struct oid_array commits = OID_ARRAY_INIT;
1136
1137                        for (; ref; ref = ref->next)
1138                                if (!is_null_oid(&ref->new_oid))
1139                                        oid_array_append(&commits,
1140                                                          &ref->new_oid);
1141
1142                        if (!push_unpushed_submodules(&commits,
1143                                                      transport->remote,
1144                                                      rs,
1145                                                      transport->push_options,
1146                                                      pretend)) {
1147                                oid_array_clear(&commits);
1148                                die(_("failed to push all needed submodules"));
1149                        }
1150                        oid_array_clear(&commits);
1151                }
1152
1153                if (((flags & TRANSPORT_RECURSE_SUBMODULES_CHECK) ||
1154                     ((flags & (TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND |
1155                                TRANSPORT_RECURSE_SUBMODULES_ONLY)) &&
1156                      !pretend)) && !is_bare_repository()) {
1157                        struct ref *ref = remote_refs;
1158                        struct string_list needs_pushing = STRING_LIST_INIT_DUP;
1159                        struct oid_array commits = OID_ARRAY_INIT;
1160
1161                        for (; ref; ref = ref->next)
1162                                if (!is_null_oid(&ref->new_oid))
1163                                        oid_array_append(&commits,
1164                                                          &ref->new_oid);
1165
1166                        if (find_unpushed_submodules(&commits, transport->remote->name,
1167                                                &needs_pushing)) {
1168                                oid_array_clear(&commits);
1169                                die_with_unpushed_submodules(&needs_pushing);
1170                        }
1171                        string_list_clear(&needs_pushing, 0);
1172                        oid_array_clear(&commits);
1173                }
1174
1175                if (!(flags & TRANSPORT_RECURSE_SUBMODULES_ONLY))
1176                        push_ret = transport->vtable->push_refs(transport, remote_refs, flags);
1177                else
1178                        push_ret = 0;
1179                err = push_had_errors(remote_refs);
1180                ret = push_ret | err;
1181
1182                if (!quiet || err)
1183                        transport_print_push_status(transport->url, remote_refs,
1184                                        verbose | porcelain, porcelain,
1185                                        reject_reasons);
1186
1187                if (flags & TRANSPORT_PUSH_SET_UPSTREAM)
1188                        set_upstreams(transport, remote_refs, pretend);
1189
1190                if (!(flags & (TRANSPORT_PUSH_DRY_RUN |
1191                               TRANSPORT_RECURSE_SUBMODULES_ONLY))) {
1192                        struct ref *ref;
1193                        for (ref = remote_refs; ref; ref = ref->next)
1194                                transport_update_tracking_ref(transport->remote, ref, verbose);
1195                }
1196
1197                if (porcelain && !push_ret)
1198                        puts("Done");
1199                else if (!quiet && !ret && !transport_refs_pushed(remote_refs))
1200                        fprintf(stderr, "Everything up-to-date\n");
1201
1202                return ret;
1203        }
1204        return 1;
1205}
1206
1207const struct ref *transport_get_remote_refs(struct transport *transport,
1208                                            const struct argv_array *ref_prefixes)
1209{
1210        if (!transport->got_remote_refs) {
1211                transport->remote_refs =
1212                        transport->vtable->get_refs_list(transport, 0,
1213                                                         ref_prefixes);
1214                transport->got_remote_refs = 1;
1215        }
1216
1217        return transport->remote_refs;
1218}
1219
1220int transport_fetch_refs(struct transport *transport, struct ref *refs)
1221{
1222        int rc;
1223        int nr_heads = 0, nr_alloc = 0, nr_refs = 0;
1224        struct ref **heads = NULL;
1225        struct ref *rm;
1226
1227        for (rm = refs; rm; rm = rm->next) {
1228                nr_refs++;
1229                if (rm->peer_ref &&
1230                    !is_null_oid(&rm->old_oid) &&
1231                    !oidcmp(&rm->peer_ref->old_oid, &rm->old_oid))
1232                        continue;
1233                ALLOC_GROW(heads, nr_heads + 1, nr_alloc);
1234                heads[nr_heads++] = rm;
1235        }
1236
1237        if (!nr_heads) {
1238                /*
1239                 * When deepening of a shallow repository is requested,
1240                 * then local and remote refs are likely to still be equal.
1241                 * Just feed them all to the fetch method in that case.
1242                 * This condition shouldn't be met in a non-deepening fetch
1243                 * (see builtin/fetch.c:quickfetch()).
1244                 */
1245                ALLOC_ARRAY(heads, nr_refs);
1246                for (rm = refs; rm; rm = rm->next)
1247                        heads[nr_heads++] = rm;
1248        }
1249
1250        rc = transport->vtable->fetch(transport, nr_heads, heads);
1251
1252        free(heads);
1253        return rc;
1254}
1255
1256void transport_unlock_pack(struct transport *transport)
1257{
1258        if (transport->pack_lockfile) {
1259                unlink_or_warn(transport->pack_lockfile);
1260                FREE_AND_NULL(transport->pack_lockfile);
1261        }
1262}
1263
1264int transport_connect(struct transport *transport, const char *name,
1265                      const char *exec, int fd[2])
1266{
1267        if (transport->vtable->connect)
1268                return transport->vtable->connect(transport, name, exec, fd);
1269        else
1270                die(_("operation not supported by protocol"));
1271}
1272
1273int transport_disconnect(struct transport *transport)
1274{
1275        int ret = 0;
1276        if (transport->vtable->disconnect)
1277                ret = transport->vtable->disconnect(transport);
1278        free(transport);
1279        return ret;
1280}
1281
1282/*
1283 * Strip username (and password) from a URL and return
1284 * it in a newly allocated string.
1285 */
1286char *transport_anonymize_url(const char *url)
1287{
1288        char *scheme_prefix, *anon_part;
1289        size_t anon_len, prefix_len = 0;
1290
1291        anon_part = strchr(url, '@');
1292        if (url_is_local_not_ssh(url) || !anon_part)
1293                goto literal_copy;
1294
1295        anon_len = strlen(++anon_part);
1296        scheme_prefix = strstr(url, "://");
1297        if (!scheme_prefix) {
1298                if (!strchr(anon_part, ':'))
1299                        /* cannot be "me@there:/path/name" */
1300                        goto literal_copy;
1301        } else {
1302                const char *cp;
1303                /* make sure scheme is reasonable */
1304                for (cp = url; cp < scheme_prefix; cp++) {
1305                        switch (*cp) {
1306                                /* RFC 1738 2.1 */
1307                        case '+': case '.': case '-':
1308                                break; /* ok */
1309                        default:
1310                                if (isalnum(*cp))
1311                                        break;
1312                                /* it isn't */
1313                                goto literal_copy;
1314                        }
1315                }
1316                /* @ past the first slash does not count */
1317                cp = strchr(scheme_prefix + 3, '/');
1318                if (cp && cp < anon_part)
1319                        goto literal_copy;
1320                prefix_len = scheme_prefix - url + 3;
1321        }
1322        return xstrfmt("%.*s%.*s", (int)prefix_len, url,
1323                       (int)anon_len, anon_part);
1324literal_copy:
1325        return xstrdup(url);
1326}
1327
1328static void read_alternate_refs(const char *path,
1329                                alternate_ref_fn *cb,
1330                                void *data)
1331{
1332        struct child_process cmd = CHILD_PROCESS_INIT;
1333        struct strbuf line = STRBUF_INIT;
1334        FILE *fh;
1335
1336        cmd.git_cmd = 1;
1337        argv_array_pushf(&cmd.args, "--git-dir=%s", path);
1338        argv_array_push(&cmd.args, "for-each-ref");
1339        argv_array_push(&cmd.args, "--format=%(objectname) %(refname)");
1340        cmd.env = local_repo_env;
1341        cmd.out = -1;
1342
1343        if (start_command(&cmd))
1344                return;
1345
1346        fh = xfdopen(cmd.out, "r");
1347        while (strbuf_getline_lf(&line, fh) != EOF) {
1348                struct object_id oid;
1349
1350                if (get_oid_hex(line.buf, &oid) ||
1351                    line.buf[GIT_SHA1_HEXSZ] != ' ') {
1352                        warning(_("invalid line while parsing alternate refs: %s"),
1353                                line.buf);
1354                        break;
1355                }
1356
1357                cb(line.buf + GIT_SHA1_HEXSZ + 1, &oid, data);
1358        }
1359
1360        fclose(fh);
1361        finish_command(&cmd);
1362}
1363
1364struct alternate_refs_data {
1365        alternate_ref_fn *fn;
1366        void *data;
1367};
1368
1369static int refs_from_alternate_cb(struct alternate_object_database *e,
1370                                  void *data)
1371{
1372        struct strbuf path = STRBUF_INIT;
1373        size_t base_len;
1374        struct alternate_refs_data *cb = data;
1375
1376        if (!strbuf_realpath(&path, e->path, 0))
1377                goto out;
1378        if (!strbuf_strip_suffix(&path, "/objects"))
1379                goto out;
1380        base_len = path.len;
1381
1382        /* Is this a git repository with refs? */
1383        strbuf_addstr(&path, "/refs");
1384        if (!is_directory(path.buf))
1385                goto out;
1386        strbuf_setlen(&path, base_len);
1387
1388        read_alternate_refs(path.buf, cb->fn, cb->data);
1389
1390out:
1391        strbuf_release(&path);
1392        return 0;
1393}
1394
1395void for_each_alternate_ref(alternate_ref_fn fn, void *data)
1396{
1397        struct alternate_refs_data cb;
1398        cb.fn = fn;
1399        cb.data = data;
1400        foreach_alt_odb(refs_from_alternate_cb, &cb);
1401}