Andrew's git / gitweb.git / transport.c
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transport.con commit fetch-pack: support negotiation tip whitelist (3390e42)
   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
 353        if (refs == NULL)
 354                ret = -1;
 355        if (report_unmatched_refs(to_fetch, nr_heads))
 356                ret = -1;
 357
 358        free_refs(refs_tmp);
 359        free_refs(refs);
 360        free(dest);
 361        return ret;
 362}
 363
 364static int push_had_errors(struct ref *ref)
 365{
 366        for (; ref; ref = ref->next) {
 367                switch (ref->status) {
 368                case REF_STATUS_NONE:
 369                case REF_STATUS_UPTODATE:
 370                case REF_STATUS_OK:
 371                        break;
 372                default:
 373                        return 1;
 374                }
 375        }
 376        return 0;
 377}
 378
 379int transport_refs_pushed(struct ref *ref)
 380{
 381        for (; ref; ref = ref->next) {
 382                switch(ref->status) {
 383                case REF_STATUS_NONE:
 384                case REF_STATUS_UPTODATE:
 385                        break;
 386                default:
 387                        return 1;
 388                }
 389        }
 390        return 0;
 391}
 392
 393void transport_update_tracking_ref(struct remote *remote, struct ref *ref, int verbose)
 394{
 395        struct refspec_item rs;
 396
 397        if (ref->status != REF_STATUS_OK && ref->status != REF_STATUS_UPTODATE)
 398                return;
 399
 400        rs.src = ref->name;
 401        rs.dst = NULL;
 402
 403        if (!remote_find_tracking(remote, &rs)) {
 404                if (verbose)
 405                        fprintf(stderr, "updating local tracking ref '%s'\n", rs.dst);
 406                if (ref->deletion) {
 407                        delete_ref(NULL, rs.dst, NULL, 0);
 408                } else
 409                        update_ref("update by push", rs.dst, &ref->new_oid,
 410                                   NULL, 0, 0);
 411                free(rs.dst);
 412        }
 413}
 414
 415static void print_ref_status(char flag, const char *summary,
 416                             struct ref *to, struct ref *from, const char *msg,
 417                             int porcelain, int summary_width)
 418{
 419        if (porcelain) {
 420                if (from)
 421                        fprintf(stdout, "%c\t%s:%s\t", flag, from->name, to->name);
 422                else
 423                        fprintf(stdout, "%c\t:%s\t", flag, to->name);
 424                if (msg)
 425                        fprintf(stdout, "%s (%s)\n", summary, msg);
 426                else
 427                        fprintf(stdout, "%s\n", summary);
 428        } else {
 429                const char *red = "", *reset = "";
 430                if (push_had_errors(to)) {
 431                        red = transport_get_color(TRANSPORT_COLOR_REJECTED);
 432                        reset = transport_get_color(TRANSPORT_COLOR_RESET);
 433                }
 434                fprintf(stderr, " %s%c %-*s%s ", red, flag, summary_width,
 435                        summary, reset);
 436                if (from)
 437                        fprintf(stderr, "%s -> %s", prettify_refname(from->name), prettify_refname(to->name));
 438                else
 439                        fputs(prettify_refname(to->name), stderr);
 440                if (msg) {
 441                        fputs(" (", stderr);
 442                        fputs(msg, stderr);
 443                        fputc(')', stderr);
 444                }
 445                fputc('\n', stderr);
 446        }
 447}
 448
 449static void print_ok_ref_status(struct ref *ref, int porcelain, int summary_width)
 450{
 451        if (ref->deletion)
 452                print_ref_status('-', "[deleted]", ref, NULL, NULL,
 453                                 porcelain, summary_width);
 454        else if (is_null_oid(&ref->old_oid))
 455                print_ref_status('*',
 456                        (starts_with(ref->name, "refs/tags/") ? "[new tag]" :
 457                        "[new branch]"),
 458                        ref, ref->peer_ref, NULL, porcelain, summary_width);
 459        else {
 460                struct strbuf quickref = STRBUF_INIT;
 461                char type;
 462                const char *msg;
 463
 464                strbuf_add_unique_abbrev(&quickref, &ref->old_oid,
 465                                         DEFAULT_ABBREV);
 466                if (ref->forced_update) {
 467                        strbuf_addstr(&quickref, "...");
 468                        type = '+';
 469                        msg = "forced update";
 470                } else {
 471                        strbuf_addstr(&quickref, "..");
 472                        type = ' ';
 473                        msg = NULL;
 474                }
 475                strbuf_add_unique_abbrev(&quickref, &ref->new_oid,
 476                                         DEFAULT_ABBREV);
 477
 478                print_ref_status(type, quickref.buf, ref, ref->peer_ref, msg,
 479                                 porcelain, summary_width);
 480                strbuf_release(&quickref);
 481        }
 482}
 483
 484static int print_one_push_status(struct ref *ref, const char *dest, int count,
 485                                 int porcelain, int summary_width)
 486{
 487        if (!count) {
 488                char *url = transport_anonymize_url(dest);
 489                fprintf(porcelain ? stdout : stderr, "To %s\n", url);
 490                free(url);
 491        }
 492
 493        switch(ref->status) {
 494        case REF_STATUS_NONE:
 495                print_ref_status('X', "[no match]", ref, NULL, NULL,
 496                                 porcelain, summary_width);
 497                break;
 498        case REF_STATUS_REJECT_NODELETE:
 499                print_ref_status('!', "[rejected]", ref, NULL,
 500                                 "remote does not support deleting refs",
 501                                 porcelain, summary_width);
 502                break;
 503        case REF_STATUS_UPTODATE:
 504                print_ref_status('=', "[up to date]", ref,
 505                                 ref->peer_ref, NULL, porcelain, summary_width);
 506                break;
 507        case REF_STATUS_REJECT_NONFASTFORWARD:
 508                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 509                                 "non-fast-forward", porcelain, summary_width);
 510                break;
 511        case REF_STATUS_REJECT_ALREADY_EXISTS:
 512                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 513                                 "already exists", porcelain, summary_width);
 514                break;
 515        case REF_STATUS_REJECT_FETCH_FIRST:
 516                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 517                                 "fetch first", porcelain, summary_width);
 518                break;
 519        case REF_STATUS_REJECT_NEEDS_FORCE:
 520                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 521                                 "needs force", porcelain, summary_width);
 522                break;
 523        case REF_STATUS_REJECT_STALE:
 524                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 525                                 "stale info", porcelain, summary_width);
 526                break;
 527        case REF_STATUS_REJECT_SHALLOW:
 528                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 529                                 "new shallow roots not allowed",
 530                                 porcelain, summary_width);
 531                break;
 532        case REF_STATUS_REMOTE_REJECT:
 533                print_ref_status('!', "[remote rejected]", ref,
 534                                 ref->deletion ? NULL : ref->peer_ref,
 535                                 ref->remote_status, porcelain, summary_width);
 536                break;
 537        case REF_STATUS_EXPECTING_REPORT:
 538                print_ref_status('!', "[remote failure]", ref,
 539                                 ref->deletion ? NULL : ref->peer_ref,
 540                                 "remote failed to report status",
 541                                 porcelain, summary_width);
 542                break;
 543        case REF_STATUS_ATOMIC_PUSH_FAILED:
 544                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 545                                 "atomic push failed", porcelain, summary_width);
 546                break;
 547        case REF_STATUS_OK:
 548                print_ok_ref_status(ref, porcelain, summary_width);
 549                break;
 550        }
 551
 552        return 1;
 553}
 554
 555static int measure_abbrev(const struct object_id *oid, int sofar)
 556{
 557        char hex[GIT_MAX_HEXSZ + 1];
 558        int w = find_unique_abbrev_r(hex, oid, DEFAULT_ABBREV);
 559
 560        return (w < sofar) ? sofar : w;
 561}
 562
 563int transport_summary_width(const struct ref *refs)
 564{
 565        int maxw = -1;
 566
 567        for (; refs; refs = refs->next) {
 568                maxw = measure_abbrev(&refs->old_oid, maxw);
 569                maxw = measure_abbrev(&refs->new_oid, maxw);
 570        }
 571        if (maxw < 0)
 572                maxw = FALLBACK_DEFAULT_ABBREV;
 573        return (2 * maxw + 3);
 574}
 575
 576void transport_print_push_status(const char *dest, struct ref *refs,
 577                                  int verbose, int porcelain, unsigned int *reject_reasons)
 578{
 579        struct ref *ref;
 580        int n = 0;
 581        char *head;
 582        int summary_width = transport_summary_width(refs);
 583
 584        if (transport_color_config() < 0)
 585                warning(_("could not parse transport.color.* config"));
 586
 587        head = resolve_refdup("HEAD", RESOLVE_REF_READING, NULL, NULL);
 588
 589        if (verbose) {
 590                for (ref = refs; ref; ref = ref->next)
 591                        if (ref->status == REF_STATUS_UPTODATE)
 592                                n += print_one_push_status(ref, dest, n,
 593                                                           porcelain, summary_width);
 594        }
 595
 596        for (ref = refs; ref; ref = ref->next)
 597                if (ref->status == REF_STATUS_OK)
 598                        n += print_one_push_status(ref, dest, n,
 599                                                   porcelain, summary_width);
 600
 601        *reject_reasons = 0;
 602        for (ref = refs; ref; ref = ref->next) {
 603                if (ref->status != REF_STATUS_NONE &&
 604                    ref->status != REF_STATUS_UPTODATE &&
 605                    ref->status != REF_STATUS_OK)
 606                        n += print_one_push_status(ref, dest, n,
 607                                                   porcelain, summary_width);
 608                if (ref->status == REF_STATUS_REJECT_NONFASTFORWARD) {
 609                        if (head != NULL && !strcmp(head, ref->name))
 610                                *reject_reasons |= REJECT_NON_FF_HEAD;
 611                        else
 612                                *reject_reasons |= REJECT_NON_FF_OTHER;
 613                } else if (ref->status == REF_STATUS_REJECT_ALREADY_EXISTS) {
 614                        *reject_reasons |= REJECT_ALREADY_EXISTS;
 615                } else if (ref->status == REF_STATUS_REJECT_FETCH_FIRST) {
 616                        *reject_reasons |= REJECT_FETCH_FIRST;
 617                } else if (ref->status == REF_STATUS_REJECT_NEEDS_FORCE) {
 618                        *reject_reasons |= REJECT_NEEDS_FORCE;
 619                }
 620        }
 621        free(head);
 622}
 623
 624static int git_transport_push(struct transport *transport, struct ref *remote_refs, int flags)
 625{
 626        struct git_transport_data *data = transport->data;
 627        struct send_pack_args args;
 628        int ret = 0;
 629
 630        if (transport_color_config() < 0)
 631                return -1;
 632
 633        if (!data->got_remote_heads)
 634                get_refs_via_connect(transport, 1, NULL);
 635
 636        memset(&args, 0, sizeof(args));
 637        args.send_mirror = !!(flags & TRANSPORT_PUSH_MIRROR);
 638        args.force_update = !!(flags & TRANSPORT_PUSH_FORCE);
 639        args.use_thin_pack = data->options.thin;
 640        args.verbose = (transport->verbose > 0);
 641        args.quiet = (transport->verbose < 0);
 642        args.progress = transport->progress;
 643        args.dry_run = !!(flags & TRANSPORT_PUSH_DRY_RUN);
 644        args.porcelain = !!(flags & TRANSPORT_PUSH_PORCELAIN);
 645        args.atomic = !!(flags & TRANSPORT_PUSH_ATOMIC);
 646        args.push_options = transport->push_options;
 647        args.url = transport->url;
 648
 649        if (flags & TRANSPORT_PUSH_CERT_ALWAYS)
 650                args.push_cert = SEND_PACK_PUSH_CERT_ALWAYS;
 651        else if (flags & TRANSPORT_PUSH_CERT_IF_ASKED)
 652                args.push_cert = SEND_PACK_PUSH_CERT_IF_ASKED;
 653        else
 654                args.push_cert = SEND_PACK_PUSH_CERT_NEVER;
 655
 656        switch (data->version) {
 657        case protocol_v2:
 658                die("support for protocol v2 not implemented yet");
 659                break;
 660        case protocol_v1:
 661        case protocol_v0:
 662                ret = send_pack(&args, data->fd, data->conn, remote_refs,
 663                                &data->extra_have);
 664                break;
 665        case protocol_unknown_version:
 666                BUG("unknown protocol version");
 667        }
 668
 669        close(data->fd[1]);
 670        close(data->fd[0]);
 671        ret |= finish_connect(data->conn);
 672        data->conn = NULL;
 673        data->got_remote_heads = 0;
 674
 675        return ret;
 676}
 677
 678static int connect_git(struct transport *transport, const char *name,
 679                       const char *executable, int fd[2])
 680{
 681        struct git_transport_data *data = transport->data;
 682        data->conn = git_connect(data->fd, transport->url,
 683                                 executable, 0);
 684        fd[0] = data->fd[0];
 685        fd[1] = data->fd[1];
 686        return 0;
 687}
 688
 689static int disconnect_git(struct transport *transport)
 690{
 691        struct git_transport_data *data = transport->data;
 692        if (data->conn) {
 693                if (data->got_remote_heads)
 694                        packet_flush(data->fd[1]);
 695                close(data->fd[0]);
 696                close(data->fd[1]);
 697                finish_connect(data->conn);
 698        }
 699
 700        free(data);
 701        return 0;
 702}
 703
 704static struct transport_vtable taken_over_vtable = {
 705        NULL,
 706        get_refs_via_connect,
 707        fetch_refs_via_pack,
 708        git_transport_push,
 709        NULL,
 710        disconnect_git
 711};
 712
 713void transport_take_over(struct transport *transport,
 714                         struct child_process *child)
 715{
 716        struct git_transport_data *data;
 717
 718        if (!transport->smart_options)
 719                BUG("taking over transport requires non-NULL "
 720                    "smart_options field.");
 721
 722        data = xcalloc(1, sizeof(*data));
 723        data->options = *transport->smart_options;
 724        data->conn = child;
 725        data->fd[0] = data->conn->out;
 726        data->fd[1] = data->conn->in;
 727        data->got_remote_heads = 0;
 728        transport->data = data;
 729
 730        transport->vtable = &taken_over_vtable;
 731        transport->smart_options = &(data->options);
 732
 733        transport->cannot_reuse = 1;
 734}
 735
 736static int is_file(const char *url)
 737{
 738        struct stat buf;
 739        if (stat(url, &buf))
 740                return 0;
 741        return S_ISREG(buf.st_mode);
 742}
 743
 744static int external_specification_len(const char *url)
 745{
 746        return strchr(url, ':') - url;
 747}
 748
 749static const struct string_list *protocol_whitelist(void)
 750{
 751        static int enabled = -1;
 752        static struct string_list allowed = STRING_LIST_INIT_DUP;
 753
 754        if (enabled < 0) {
 755                const char *v = getenv("GIT_ALLOW_PROTOCOL");
 756                if (v) {
 757                        string_list_split(&allowed, v, ':', -1);
 758                        string_list_sort(&allowed);
 759                        enabled = 1;
 760                } else {
 761                        enabled = 0;
 762                }
 763        }
 764
 765        return enabled ? &allowed : NULL;
 766}
 767
 768enum protocol_allow_config {
 769        PROTOCOL_ALLOW_NEVER = 0,
 770        PROTOCOL_ALLOW_USER_ONLY,
 771        PROTOCOL_ALLOW_ALWAYS
 772};
 773
 774static enum protocol_allow_config parse_protocol_config(const char *key,
 775                                                        const char *value)
 776{
 777        if (!strcasecmp(value, "always"))
 778                return PROTOCOL_ALLOW_ALWAYS;
 779        else if (!strcasecmp(value, "never"))
 780                return PROTOCOL_ALLOW_NEVER;
 781        else if (!strcasecmp(value, "user"))
 782                return PROTOCOL_ALLOW_USER_ONLY;
 783
 784        die("unknown value for config '%s': %s", key, value);
 785}
 786
 787static enum protocol_allow_config get_protocol_config(const char *type)
 788{
 789        char *key = xstrfmt("protocol.%s.allow", type);
 790        char *value;
 791
 792        /* first check the per-protocol config */
 793        if (!git_config_get_string(key, &value)) {
 794                enum protocol_allow_config ret =
 795                        parse_protocol_config(key, value);
 796                free(key);
 797                free(value);
 798                return ret;
 799        }
 800        free(key);
 801
 802        /* if defined, fallback to user-defined default for unknown protocols */
 803        if (!git_config_get_string("protocol.allow", &value)) {
 804                enum protocol_allow_config ret =
 805                        parse_protocol_config("protocol.allow", value);
 806                free(value);
 807                return ret;
 808        }
 809
 810        /* fallback to built-in defaults */
 811        /* known safe */
 812        if (!strcmp(type, "http") ||
 813            !strcmp(type, "https") ||
 814            !strcmp(type, "git") ||
 815            !strcmp(type, "ssh") ||
 816            !strcmp(type, "file"))
 817                return PROTOCOL_ALLOW_ALWAYS;
 818
 819        /* known scary; err on the side of caution */
 820        if (!strcmp(type, "ext"))
 821                return PROTOCOL_ALLOW_NEVER;
 822
 823        /* unknown; by default let them be used only directly by the user */
 824        return PROTOCOL_ALLOW_USER_ONLY;
 825}
 826
 827int is_transport_allowed(const char *type, int from_user)
 828{
 829        const struct string_list *whitelist = protocol_whitelist();
 830        if (whitelist)
 831                return string_list_has_string(whitelist, type);
 832
 833        switch (get_protocol_config(type)) {
 834        case PROTOCOL_ALLOW_ALWAYS:
 835                return 1;
 836        case PROTOCOL_ALLOW_NEVER:
 837                return 0;
 838        case PROTOCOL_ALLOW_USER_ONLY:
 839                if (from_user < 0)
 840                        from_user = git_env_bool("GIT_PROTOCOL_FROM_USER", 1);
 841                return from_user;
 842        }
 843
 844        BUG("invalid protocol_allow_config type");
 845}
 846
 847void transport_check_allowed(const char *type)
 848{
 849        if (!is_transport_allowed(type, -1))
 850                die("transport '%s' not allowed", type);
 851}
 852
 853static struct transport_vtable bundle_vtable = {
 854        NULL,
 855        get_refs_from_bundle,
 856        fetch_refs_from_bundle,
 857        NULL,
 858        NULL,
 859        close_bundle
 860};
 861
 862static struct transport_vtable builtin_smart_vtable = {
 863        NULL,
 864        get_refs_via_connect,
 865        fetch_refs_via_pack,
 866        git_transport_push,
 867        connect_git,
 868        disconnect_git
 869};
 870
 871struct transport *transport_get(struct remote *remote, const char *url)
 872{
 873        const char *helper;
 874        struct transport *ret = xcalloc(1, sizeof(*ret));
 875
 876        ret->progress = isatty(2);
 877
 878        if (!remote)
 879                die("No remote provided to transport_get()");
 880
 881        ret->got_remote_refs = 0;
 882        ret->remote = remote;
 883        helper = remote->foreign_vcs;
 884
 885        if (!url && remote->url)
 886                url = remote->url[0];
 887        ret->url = url;
 888
 889        /* maybe it is a foreign URL? */
 890        if (url) {
 891                const char *p = url;
 892
 893                while (is_urlschemechar(p == url, *p))
 894                        p++;
 895                if (starts_with(p, "::"))
 896                        helper = xstrndup(url, p - url);
 897        }
 898
 899        if (helper) {
 900                transport_helper_init(ret, helper);
 901        } else if (starts_with(url, "rsync:")) {
 902                die("git-over-rsync is no longer supported");
 903        } else if (url_is_local_not_ssh(url) && is_file(url) && is_bundle(url, 1)) {
 904                struct bundle_transport_data *data = xcalloc(1, sizeof(*data));
 905                transport_check_allowed("file");
 906                ret->data = data;
 907                ret->vtable = &bundle_vtable;
 908                ret->smart_options = NULL;
 909        } else if (!is_url(url)
 910                || starts_with(url, "file://")
 911                || starts_with(url, "git://")
 912                || starts_with(url, "ssh://")
 913                || starts_with(url, "git+ssh://") /* deprecated - do not use */
 914                || starts_with(url, "ssh+git://") /* deprecated - do not use */
 915                ) {
 916                /*
 917                 * These are builtin smart transports; "allowed" transports
 918                 * will be checked individually in git_connect.
 919                 */
 920                struct git_transport_data *data = xcalloc(1, sizeof(*data));
 921                ret->data = data;
 922                ret->vtable = &builtin_smart_vtable;
 923                ret->smart_options = &(data->options);
 924
 925                data->conn = NULL;
 926                data->got_remote_heads = 0;
 927        } else {
 928                /* Unknown protocol in URL. Pass to external handler. */
 929                int len = external_specification_len(url);
 930                char *handler = xmemdupz(url, len);
 931                transport_helper_init(ret, handler);
 932        }
 933
 934        if (ret->smart_options) {
 935                ret->smart_options->thin = 1;
 936                ret->smart_options->uploadpack = "git-upload-pack";
 937                if (remote->uploadpack)
 938                        ret->smart_options->uploadpack = remote->uploadpack;
 939                ret->smart_options->receivepack = "git-receive-pack";
 940                if (remote->receivepack)
 941                        ret->smart_options->receivepack = remote->receivepack;
 942        }
 943
 944        return ret;
 945}
 946
 947int transport_set_option(struct transport *transport,
 948                         const char *name, const char *value)
 949{
 950        int git_reports = 1, protocol_reports = 1;
 951
 952        if (transport->smart_options)
 953                git_reports = set_git_option(transport->smart_options,
 954                                             name, value);
 955
 956        if (transport->vtable->set_option)
 957                protocol_reports = transport->vtable->set_option(transport,
 958                                                                 name, value);
 959
 960        /* If either report is 0, report 0 (success). */
 961        if (!git_reports || !protocol_reports)
 962                return 0;
 963        /* If either reports -1 (invalid value), report -1. */
 964        if ((git_reports == -1) || (protocol_reports == -1))
 965                return -1;
 966        /* Otherwise if both report unknown, report unknown. */
 967        return 1;
 968}
 969
 970void transport_set_verbosity(struct transport *transport, int verbosity,
 971        int force_progress)
 972{
 973        if (verbosity >= 1)
 974                transport->verbose = verbosity <= 3 ? verbosity : 3;
 975        if (verbosity < 0)
 976                transport->verbose = -1;
 977
 978        /**
 979         * Rules used to determine whether to report progress (processing aborts
 980         * when a rule is satisfied):
 981         *
 982         *   . Report progress, if force_progress is 1 (ie. --progress).
 983         *   . Don't report progress, if force_progress is 0 (ie. --no-progress).
 984         *   . Don't report progress, if verbosity < 0 (ie. -q/--quiet ).
 985         *   . Report progress if isatty(2) is 1.
 986         **/
 987        if (force_progress >= 0)
 988                transport->progress = !!force_progress;
 989        else
 990                transport->progress = verbosity >= 0 && isatty(2);
 991}
 992
 993static void die_with_unpushed_submodules(struct string_list *needs_pushing)
 994{
 995        int i;
 996
 997        fprintf(stderr, _("The following submodule paths contain changes that can\n"
 998                        "not be found on any remote:\n"));
 999        for (i = 0; i < needs_pushing->nr; i++)
1000                fprintf(stderr, "  %s\n", needs_pushing->items[i].string);
1001        fprintf(stderr, _("\nPlease try\n\n"
1002                          "     git push --recurse-submodules=on-demand\n\n"
1003                          "or cd to the path and use\n\n"
1004                          "     git push\n\n"
1005                          "to push them to a remote.\n\n"));
1006
1007        string_list_clear(needs_pushing, 0);
1008
1009        die(_("Aborting."));
1010}
1011
1012static int run_pre_push_hook(struct transport *transport,
1013                             struct ref *remote_refs)
1014{
1015        int ret = 0, x;
1016        struct ref *r;
1017        struct child_process proc = CHILD_PROCESS_INIT;
1018        struct strbuf buf;
1019        const char *argv[4];
1020
1021        if (!(argv[0] = find_hook("pre-push")))
1022                return 0;
1023
1024        argv[1] = transport->remote->name;
1025        argv[2] = transport->url;
1026        argv[3] = NULL;
1027
1028        proc.argv = argv;
1029        proc.in = -1;
1030
1031        if (start_command(&proc)) {
1032                finish_command(&proc);
1033                return -1;
1034        }
1035
1036        sigchain_push(SIGPIPE, SIG_IGN);
1037
1038        strbuf_init(&buf, 256);
1039
1040        for (r = remote_refs; r; r = r->next) {
1041                if (!r->peer_ref) continue;
1042                if (r->status == REF_STATUS_REJECT_NONFASTFORWARD) continue;
1043                if (r->status == REF_STATUS_REJECT_STALE) continue;
1044                if (r->status == REF_STATUS_UPTODATE) continue;
1045
1046                strbuf_reset(&buf);
1047                strbuf_addf( &buf, "%s %s %s %s\n",
1048                         r->peer_ref->name, oid_to_hex(&r->new_oid),
1049                         r->name, oid_to_hex(&r->old_oid));
1050
1051                if (write_in_full(proc.in, buf.buf, buf.len) < 0) {
1052                        /* We do not mind if a hook does not read all refs. */
1053                        if (errno != EPIPE)
1054                                ret = -1;
1055                        break;
1056                }
1057        }
1058
1059        strbuf_release(&buf);
1060
1061        x = close(proc.in);
1062        if (!ret)
1063                ret = x;
1064
1065        sigchain_pop(SIGPIPE);
1066
1067        x = finish_command(&proc);
1068        if (!ret)
1069                ret = x;
1070
1071        return ret;
1072}
1073
1074int transport_push(struct transport *transport,
1075                   struct refspec *rs, int flags,
1076                   unsigned int *reject_reasons)
1077{
1078        *reject_reasons = 0;
1079
1080        if (transport_color_config() < 0)
1081                return -1;
1082
1083        if (transport->vtable->push_refs) {
1084                struct ref *remote_refs;
1085                struct ref *local_refs = get_local_heads();
1086                int match_flags = MATCH_REFS_NONE;
1087                int verbose = (transport->verbose > 0);
1088                int quiet = (transport->verbose < 0);
1089                int porcelain = flags & TRANSPORT_PUSH_PORCELAIN;
1090                int pretend = flags & TRANSPORT_PUSH_DRY_RUN;
1091                int push_ret, ret, err;
1092                struct argv_array ref_prefixes = ARGV_ARRAY_INIT;
1093
1094                if (check_push_refs(local_refs, rs) < 0)
1095                        return -1;
1096
1097                refspec_ref_prefixes(rs, &ref_prefixes);
1098
1099                remote_refs = transport->vtable->get_refs_list(transport, 1,
1100                                                               &ref_prefixes);
1101
1102                argv_array_clear(&ref_prefixes);
1103
1104                if (flags & TRANSPORT_PUSH_ALL)
1105                        match_flags |= MATCH_REFS_ALL;
1106                if (flags & TRANSPORT_PUSH_MIRROR)
1107                        match_flags |= MATCH_REFS_MIRROR;
1108                if (flags & TRANSPORT_PUSH_PRUNE)
1109                        match_flags |= MATCH_REFS_PRUNE;
1110                if (flags & TRANSPORT_PUSH_FOLLOW_TAGS)
1111                        match_flags |= MATCH_REFS_FOLLOW_TAGS;
1112
1113                if (match_push_refs(local_refs, &remote_refs, rs, match_flags))
1114                        return -1;
1115
1116                if (transport->smart_options &&
1117                    transport->smart_options->cas &&
1118                    !is_empty_cas(transport->smart_options->cas))
1119                        apply_push_cas(transport->smart_options->cas,
1120                                       transport->remote, remote_refs);
1121
1122                set_ref_status_for_push(remote_refs,
1123                        flags & TRANSPORT_PUSH_MIRROR,
1124                        flags & TRANSPORT_PUSH_FORCE);
1125
1126                if (!(flags & TRANSPORT_PUSH_NO_HOOK))
1127                        if (run_pre_push_hook(transport, remote_refs))
1128                                return -1;
1129
1130                if ((flags & (TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND |
1131                              TRANSPORT_RECURSE_SUBMODULES_ONLY)) &&
1132                    !is_bare_repository()) {
1133                        struct ref *ref = remote_refs;
1134                        struct oid_array commits = OID_ARRAY_INIT;
1135
1136                        for (; ref; ref = ref->next)
1137                                if (!is_null_oid(&ref->new_oid))
1138                                        oid_array_append(&commits,
1139                                                          &ref->new_oid);
1140
1141                        if (!push_unpushed_submodules(&commits,
1142                                                      transport->remote,
1143                                                      rs,
1144                                                      transport->push_options,
1145                                                      pretend)) {
1146                                oid_array_clear(&commits);
1147                                die("Failed to push all needed submodules!");
1148                        }
1149                        oid_array_clear(&commits);
1150                }
1151
1152                if (((flags & TRANSPORT_RECURSE_SUBMODULES_CHECK) ||
1153                     ((flags & (TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND |
1154                                TRANSPORT_RECURSE_SUBMODULES_ONLY)) &&
1155                      !pretend)) && !is_bare_repository()) {
1156                        struct ref *ref = remote_refs;
1157                        struct string_list needs_pushing = STRING_LIST_INIT_DUP;
1158                        struct oid_array commits = OID_ARRAY_INIT;
1159
1160                        for (; ref; ref = ref->next)
1161                                if (!is_null_oid(&ref->new_oid))
1162                                        oid_array_append(&commits,
1163                                                          &ref->new_oid);
1164
1165                        if (find_unpushed_submodules(&commits, transport->remote->name,
1166                                                &needs_pushing)) {
1167                                oid_array_clear(&commits);
1168                                die_with_unpushed_submodules(&needs_pushing);
1169                        }
1170                        string_list_clear(&needs_pushing, 0);
1171                        oid_array_clear(&commits);
1172                }
1173
1174                if (!(flags & TRANSPORT_RECURSE_SUBMODULES_ONLY))
1175                        push_ret = transport->vtable->push_refs(transport, remote_refs, flags);
1176                else
1177                        push_ret = 0;
1178                err = push_had_errors(remote_refs);
1179                ret = push_ret | err;
1180
1181                if (!quiet || err)
1182                        transport_print_push_status(transport->url, remote_refs,
1183                                        verbose | porcelain, porcelain,
1184                                        reject_reasons);
1185
1186                if (flags & TRANSPORT_PUSH_SET_UPSTREAM)
1187                        set_upstreams(transport, remote_refs, pretend);
1188
1189                if (!(flags & (TRANSPORT_PUSH_DRY_RUN |
1190                               TRANSPORT_RECURSE_SUBMODULES_ONLY))) {
1191                        struct ref *ref;
1192                        for (ref = remote_refs; ref; ref = ref->next)
1193                                transport_update_tracking_ref(transport->remote, ref, verbose);
1194                }
1195
1196                if (porcelain && !push_ret)
1197                        puts("Done");
1198                else if (!quiet && !ret && !transport_refs_pushed(remote_refs))
1199                        fprintf(stderr, "Everything up-to-date\n");
1200
1201                return ret;
1202        }
1203        return 1;
1204}
1205
1206const struct ref *transport_get_remote_refs(struct transport *transport,
1207                                            const struct argv_array *ref_prefixes)
1208{
1209        if (!transport->got_remote_refs) {
1210                transport->remote_refs =
1211                        transport->vtable->get_refs_list(transport, 0,
1212                                                         ref_prefixes);
1213                transport->got_remote_refs = 1;
1214        }
1215
1216        return transport->remote_refs;
1217}
1218
1219int transport_fetch_refs(struct transport *transport, struct ref *refs)
1220{
1221        int rc;
1222        int nr_heads = 0, nr_alloc = 0, nr_refs = 0;
1223        struct ref **heads = NULL;
1224        struct ref *rm;
1225
1226        for (rm = refs; rm; rm = rm->next) {
1227                nr_refs++;
1228                if (rm->peer_ref &&
1229                    !is_null_oid(&rm->old_oid) &&
1230                    !oidcmp(&rm->peer_ref->old_oid, &rm->old_oid))
1231                        continue;
1232                ALLOC_GROW(heads, nr_heads + 1, nr_alloc);
1233                heads[nr_heads++] = rm;
1234        }
1235
1236        if (!nr_heads) {
1237                /*
1238                 * When deepening of a shallow repository is requested,
1239                 * then local and remote refs are likely to still be equal.
1240                 * Just feed them all to the fetch method in that case.
1241                 * This condition shouldn't be met in a non-deepening fetch
1242                 * (see builtin/fetch.c:quickfetch()).
1243                 */
1244                ALLOC_ARRAY(heads, nr_refs);
1245                for (rm = refs; rm; rm = rm->next)
1246                        heads[nr_heads++] = rm;
1247        }
1248
1249        rc = transport->vtable->fetch(transport, nr_heads, heads);
1250
1251        free(heads);
1252        return rc;
1253}
1254
1255void transport_unlock_pack(struct transport *transport)
1256{
1257        if (transport->pack_lockfile) {
1258                unlink_or_warn(transport->pack_lockfile);
1259                FREE_AND_NULL(transport->pack_lockfile);
1260        }
1261}
1262
1263int transport_connect(struct transport *transport, const char *name,
1264                      const char *exec, int fd[2])
1265{
1266        if (transport->vtable->connect)
1267                return transport->vtable->connect(transport, name, exec, fd);
1268        else
1269                die("Operation not supported by protocol");
1270}
1271
1272int transport_disconnect(struct transport *transport)
1273{
1274        int ret = 0;
1275        if (transport->vtable->disconnect)
1276                ret = transport->vtable->disconnect(transport);
1277        free(transport);
1278        return ret;
1279}
1280
1281/*
1282 * Strip username (and password) from a URL and return
1283 * it in a newly allocated string.
1284 */
1285char *transport_anonymize_url(const char *url)
1286{
1287        char *scheme_prefix, *anon_part;
1288        size_t anon_len, prefix_len = 0;
1289
1290        anon_part = strchr(url, '@');
1291        if (url_is_local_not_ssh(url) || !anon_part)
1292                goto literal_copy;
1293
1294        anon_len = strlen(++anon_part);
1295        scheme_prefix = strstr(url, "://");
1296        if (!scheme_prefix) {
1297                if (!strchr(anon_part, ':'))
1298                        /* cannot be "me@there:/path/name" */
1299                        goto literal_copy;
1300        } else {
1301                const char *cp;
1302                /* make sure scheme is reasonable */
1303                for (cp = url; cp < scheme_prefix; cp++) {
1304                        switch (*cp) {
1305                                /* RFC 1738 2.1 */
1306                        case '+': case '.': case '-':
1307                                break; /* ok */
1308                        default:
1309                                if (isalnum(*cp))
1310                                        break;
1311                                /* it isn't */
1312                                goto literal_copy;
1313                        }
1314                }
1315                /* @ past the first slash does not count */
1316                cp = strchr(scheme_prefix + 3, '/');
1317                if (cp && cp < anon_part)
1318                        goto literal_copy;
1319                prefix_len = scheme_prefix - url + 3;
1320        }
1321        return xstrfmt("%.*s%.*s", (int)prefix_len, url,
1322                       (int)anon_len, anon_part);
1323literal_copy:
1324        return xstrdup(url);
1325}
1326
1327static void read_alternate_refs(const char *path,
1328                                alternate_ref_fn *cb,
1329                                void *data)
1330{
1331        struct child_process cmd = CHILD_PROCESS_INIT;
1332        struct strbuf line = STRBUF_INIT;
1333        FILE *fh;
1334
1335        cmd.git_cmd = 1;
1336        argv_array_pushf(&cmd.args, "--git-dir=%s", path);
1337        argv_array_push(&cmd.args, "for-each-ref");
1338        argv_array_push(&cmd.args, "--format=%(objectname) %(refname)");
1339        cmd.env = local_repo_env;
1340        cmd.out = -1;
1341
1342        if (start_command(&cmd))
1343                return;
1344
1345        fh = xfdopen(cmd.out, "r");
1346        while (strbuf_getline_lf(&line, fh) != EOF) {
1347                struct object_id oid;
1348
1349                if (get_oid_hex(line.buf, &oid) ||
1350                    line.buf[GIT_SHA1_HEXSZ] != ' ') {
1351                        warning("invalid line while parsing alternate refs: %s",
1352                                line.buf);
1353                        break;
1354                }
1355
1356                cb(line.buf + GIT_SHA1_HEXSZ + 1, &oid, data);
1357        }
1358
1359        fclose(fh);
1360        finish_command(&cmd);
1361}
1362
1363struct alternate_refs_data {
1364        alternate_ref_fn *fn;
1365        void *data;
1366};
1367
1368static int refs_from_alternate_cb(struct alternate_object_database *e,
1369                                  void *data)
1370{
1371        struct strbuf path = STRBUF_INIT;
1372        size_t base_len;
1373        struct alternate_refs_data *cb = data;
1374
1375        if (!strbuf_realpath(&path, e->path, 0))
1376                goto out;
1377        if (!strbuf_strip_suffix(&path, "/objects"))
1378                goto out;
1379        base_len = path.len;
1380
1381        /* Is this a git repository with refs? */
1382        strbuf_addstr(&path, "/refs");
1383        if (!is_directory(path.buf))
1384                goto out;
1385        strbuf_setlen(&path, base_len);
1386
1387        read_alternate_refs(path.buf, cb->fn, cb->data);
1388
1389out:
1390        strbuf_release(&path);
1391        return 0;
1392}
1393
1394void for_each_alternate_ref(alternate_ref_fn fn, void *data)
1395{
1396        struct alternate_refs_data cb;
1397        cb.fn = fn;
1398        cb.data = data;
1399        foreach_alt_odb(refs_from_alternate_cb, &cb);
1400}