Andrew's git / gitweb.git / transport.c
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transport.con commit Merge branch 'tz/doc-git-urls-reference' (df7abe3)
   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 "branch.h"
  15#include "url.h"
  16#include "submodule.h"
  17#include "string-list.h"
  18#include "sha1-array.h"
  19#include "sigchain.h"
  20#include "transport-internal.h"
  21#include "protocol.h"
  22#include "object-store.h"
  23
  24static void set_upstreams(struct transport *transport, struct ref *refs,
  25        int pretend)
  26{
  27        struct ref *ref;
  28        for (ref = refs; ref; ref = ref->next) {
  29                const char *localname;
  30                const char *tmp;
  31                const char *remotename;
  32                int flag = 0;
  33                /*
  34                 * Check suitability for tracking. Must be successful /
  35                 * already up-to-date ref create/modify (not delete).
  36                 */
  37                if (ref->status != REF_STATUS_OK &&
  38                        ref->status != REF_STATUS_UPTODATE)
  39                        continue;
  40                if (!ref->peer_ref)
  41                        continue;
  42                if (is_null_oid(&ref->new_oid))
  43                        continue;
  44
  45                /* Follow symbolic refs (mainly for HEAD). */
  46                localname = ref->peer_ref->name;
  47                remotename = ref->name;
  48                tmp = resolve_ref_unsafe(localname, RESOLVE_REF_READING,
  49                                         NULL, &flag);
  50                if (tmp && flag & REF_ISSYMREF &&
  51                        starts_with(tmp, "refs/heads/"))
  52                        localname = tmp;
  53
  54                /* Both source and destination must be local branches. */
  55                if (!localname || !starts_with(localname, "refs/heads/"))
  56                        continue;
  57                if (!remotename || !starts_with(remotename, "refs/heads/"))
  58                        continue;
  59
  60                if (!pretend)
  61                        install_branch_config(BRANCH_CONFIG_VERBOSE,
  62                                localname + 11, transport->remote->name,
  63                                remotename);
  64                else
  65                        printf(_("Would set upstream of '%s' to '%s' of '%s'\n"),
  66                                localname + 11, remotename + 11,
  67                                transport->remote->name);
  68        }
  69}
  70
  71struct bundle_transport_data {
  72        int fd;
  73        struct bundle_header header;
  74};
  75
  76static struct ref *get_refs_from_bundle(struct transport *transport,
  77                                        int for_push,
  78                                        const struct argv_array *ref_prefixes)
  79{
  80        struct bundle_transport_data *data = transport->data;
  81        struct ref *result = NULL;
  82        int i;
  83
  84        if (for_push)
  85                return NULL;
  86
  87        if (data->fd > 0)
  88                close(data->fd);
  89        data->fd = read_bundle_header(transport->url, &data->header);
  90        if (data->fd < 0)
  91                die ("Could not read bundle '%s'.", transport->url);
  92        for (i = 0; i < data->header.references.nr; i++) {
  93                struct ref_list_entry *e = data->header.references.list + i;
  94                struct ref *ref = alloc_ref(e->name);
  95                oidcpy(&ref->old_oid, &e->oid);
  96                ref->next = result;
  97                result = ref;
  98        }
  99        return result;
 100}
 101
 102static int fetch_refs_from_bundle(struct transport *transport,
 103                               int nr_heads, struct ref **to_fetch)
 104{
 105        struct bundle_transport_data *data = transport->data;
 106        return unbundle(&data->header, data->fd,
 107                        transport->progress ? BUNDLE_VERBOSE : 0);
 108}
 109
 110static int close_bundle(struct transport *transport)
 111{
 112        struct bundle_transport_data *data = transport->data;
 113        if (data->fd > 0)
 114                close(data->fd);
 115        free(data);
 116        return 0;
 117}
 118
 119struct git_transport_data {
 120        struct git_transport_options options;
 121        struct child_process *conn;
 122        int fd[2];
 123        unsigned got_remote_heads : 1;
 124        enum protocol_version version;
 125        struct oid_array extra_have;
 126        struct oid_array shallow;
 127};
 128
 129static int set_git_option(struct git_transport_options *opts,
 130                          const char *name, const char *value)
 131{
 132        if (!strcmp(name, TRANS_OPT_UPLOADPACK)) {
 133                opts->uploadpack = value;
 134                return 0;
 135        } else if (!strcmp(name, TRANS_OPT_RECEIVEPACK)) {
 136                opts->receivepack = value;
 137                return 0;
 138        } else if (!strcmp(name, TRANS_OPT_THIN)) {
 139                opts->thin = !!value;
 140                return 0;
 141        } else if (!strcmp(name, TRANS_OPT_FOLLOWTAGS)) {
 142                opts->followtags = !!value;
 143                return 0;
 144        } else if (!strcmp(name, TRANS_OPT_KEEP)) {
 145                opts->keep = !!value;
 146                return 0;
 147        } else if (!strcmp(name, TRANS_OPT_UPDATE_SHALLOW)) {
 148                opts->update_shallow = !!value;
 149                return 0;
 150        } else if (!strcmp(name, TRANS_OPT_DEPTH)) {
 151                if (!value)
 152                        opts->depth = 0;
 153                else {
 154                        char *end;
 155                        opts->depth = strtol(value, &end, 0);
 156                        if (*end)
 157                                die(_("transport: invalid depth option '%s'"), value);
 158                }
 159                return 0;
 160        } else if (!strcmp(name, TRANS_OPT_DEEPEN_SINCE)) {
 161                opts->deepen_since = value;
 162                return 0;
 163        } else if (!strcmp(name, TRANS_OPT_DEEPEN_NOT)) {
 164                opts->deepen_not = (const struct string_list *)value;
 165                return 0;
 166        } else if (!strcmp(name, TRANS_OPT_DEEPEN_RELATIVE)) {
 167                opts->deepen_relative = !!value;
 168                return 0;
 169        } else if (!strcmp(name, TRANS_OPT_FROM_PROMISOR)) {
 170                opts->from_promisor = !!value;
 171                return 0;
 172        } else if (!strcmp(name, TRANS_OPT_NO_DEPENDENTS)) {
 173                opts->no_dependents = !!value;
 174                return 0;
 175        } else if (!strcmp(name, TRANS_OPT_LIST_OBJECTS_FILTER)) {
 176                parse_list_objects_filter(&opts->filter_options, value);
 177                return 0;
 178        }
 179        return 1;
 180}
 181
 182static int connect_setup(struct transport *transport, int for_push)
 183{
 184        struct git_transport_data *data = transport->data;
 185        int flags = transport->verbose > 0 ? CONNECT_VERBOSE : 0;
 186
 187        if (data->conn)
 188                return 0;
 189
 190        switch (transport->family) {
 191        case TRANSPORT_FAMILY_ALL: break;
 192        case TRANSPORT_FAMILY_IPV4: flags |= CONNECT_IPV4; break;
 193        case TRANSPORT_FAMILY_IPV6: flags |= CONNECT_IPV6; break;
 194        }
 195
 196        data->conn = git_connect(data->fd, transport->url,
 197                                 for_push ? data->options.receivepack :
 198                                 data->options.uploadpack,
 199                                 flags);
 200
 201        return 0;
 202}
 203
 204static struct ref *get_refs_via_connect(struct transport *transport, int for_push,
 205                                        const struct argv_array *ref_prefixes)
 206{
 207        struct git_transport_data *data = transport->data;
 208        struct ref *refs = NULL;
 209        struct packet_reader reader;
 210
 211        connect_setup(transport, for_push);
 212
 213        packet_reader_init(&reader, data->fd[0], NULL, 0,
 214                           PACKET_READ_CHOMP_NEWLINE |
 215                           PACKET_READ_GENTLE_ON_EOF);
 216
 217        data->version = discover_version(&reader);
 218        switch (data->version) {
 219        case protocol_v2:
 220                get_remote_refs(data->fd[1], &reader, &refs, for_push,
 221                                ref_prefixes);
 222                break;
 223        case protocol_v1:
 224        case protocol_v0:
 225                get_remote_heads(&reader, &refs,
 226                                 for_push ? REF_NORMAL : 0,
 227                                 &data->extra_have,
 228                                 &data->shallow);
 229                break;
 230        case protocol_unknown_version:
 231                BUG("unknown protocol version");
 232        }
 233        data->got_remote_heads = 1;
 234
 235        return refs;
 236}
 237
 238static int fetch_refs_via_pack(struct transport *transport,
 239                               int nr_heads, struct ref **to_fetch)
 240{
 241        int ret = 0;
 242        struct git_transport_data *data = transport->data;
 243        struct ref *refs = NULL;
 244        char *dest = xstrdup(transport->url);
 245        struct fetch_pack_args args;
 246        struct ref *refs_tmp = NULL;
 247
 248        memset(&args, 0, sizeof(args));
 249        args.uploadpack = data->options.uploadpack;
 250        args.keep_pack = data->options.keep;
 251        args.lock_pack = 1;
 252        args.use_thin_pack = data->options.thin;
 253        args.include_tag = data->options.followtags;
 254        args.verbose = (transport->verbose > 1);
 255        args.quiet = (transport->verbose < 0);
 256        args.no_progress = !transport->progress;
 257        args.depth = data->options.depth;
 258        args.deepen_since = data->options.deepen_since;
 259        args.deepen_not = data->options.deepen_not;
 260        args.deepen_relative = data->options.deepen_relative;
 261        args.check_self_contained_and_connected =
 262                data->options.check_self_contained_and_connected;
 263        args.cloning = transport->cloning;
 264        args.update_shallow = data->options.update_shallow;
 265        args.from_promisor = data->options.from_promisor;
 266        args.no_dependents = data->options.no_dependents;
 267        args.filter_options = data->options.filter_options;
 268        args.stateless_rpc = transport->stateless_rpc;
 269
 270        if (!data->got_remote_heads)
 271                refs_tmp = get_refs_via_connect(transport, 0, NULL);
 272
 273        switch (data->version) {
 274        case protocol_v2:
 275                refs = fetch_pack(&args, data->fd, data->conn,
 276                                  refs_tmp ? refs_tmp : transport->remote_refs,
 277                                  dest, to_fetch, nr_heads, &data->shallow,
 278                                  &transport->pack_lockfile, data->version);
 279                break;
 280        case protocol_v1:
 281        case protocol_v0:
 282                refs = fetch_pack(&args, data->fd, data->conn,
 283                                  refs_tmp ? refs_tmp : transport->remote_refs,
 284                                  dest, to_fetch, nr_heads, &data->shallow,
 285                                  &transport->pack_lockfile, data->version);
 286                break;
 287        case protocol_unknown_version:
 288                BUG("unknown protocol version");
 289        }
 290
 291        close(data->fd[0]);
 292        close(data->fd[1]);
 293        if (finish_connect(data->conn))
 294                ret = -1;
 295        data->conn = NULL;
 296        data->got_remote_heads = 0;
 297        data->options.self_contained_and_connected =
 298                args.self_contained_and_connected;
 299
 300        if (refs == NULL)
 301                ret = -1;
 302        if (report_unmatched_refs(to_fetch, nr_heads))
 303                ret = -1;
 304
 305        free_refs(refs_tmp);
 306        free_refs(refs);
 307        free(dest);
 308        return ret;
 309}
 310
 311static int push_had_errors(struct ref *ref)
 312{
 313        for (; ref; ref = ref->next) {
 314                switch (ref->status) {
 315                case REF_STATUS_NONE:
 316                case REF_STATUS_UPTODATE:
 317                case REF_STATUS_OK:
 318                        break;
 319                default:
 320                        return 1;
 321                }
 322        }
 323        return 0;
 324}
 325
 326int transport_refs_pushed(struct ref *ref)
 327{
 328        for (; ref; ref = ref->next) {
 329                switch(ref->status) {
 330                case REF_STATUS_NONE:
 331                case REF_STATUS_UPTODATE:
 332                        break;
 333                default:
 334                        return 1;
 335                }
 336        }
 337        return 0;
 338}
 339
 340void transport_update_tracking_ref(struct remote *remote, struct ref *ref, int verbose)
 341{
 342        struct refspec rs;
 343
 344        if (ref->status != REF_STATUS_OK && ref->status != REF_STATUS_UPTODATE)
 345                return;
 346
 347        rs.src = ref->name;
 348        rs.dst = NULL;
 349
 350        if (!remote_find_tracking(remote, &rs)) {
 351                if (verbose)
 352                        fprintf(stderr, "updating local tracking ref '%s'\n", rs.dst);
 353                if (ref->deletion) {
 354                        delete_ref(NULL, rs.dst, NULL, 0);
 355                } else
 356                        update_ref("update by push", rs.dst, &ref->new_oid,
 357                                   NULL, 0, 0);
 358                free(rs.dst);
 359        }
 360}
 361
 362static void print_ref_status(char flag, const char *summary,
 363                             struct ref *to, struct ref *from, const char *msg,
 364                             int porcelain, int summary_width)
 365{
 366        if (porcelain) {
 367                if (from)
 368                        fprintf(stdout, "%c\t%s:%s\t", flag, from->name, to->name);
 369                else
 370                        fprintf(stdout, "%c\t:%s\t", flag, to->name);
 371                if (msg)
 372                        fprintf(stdout, "%s (%s)\n", summary, msg);
 373                else
 374                        fprintf(stdout, "%s\n", summary);
 375        } else {
 376                fprintf(stderr, " %c %-*s ", flag, summary_width, summary);
 377                if (from)
 378                        fprintf(stderr, "%s -> %s", prettify_refname(from->name), prettify_refname(to->name));
 379                else
 380                        fputs(prettify_refname(to->name), stderr);
 381                if (msg) {
 382                        fputs(" (", stderr);
 383                        fputs(msg, stderr);
 384                        fputc(')', stderr);
 385                }
 386                fputc('\n', stderr);
 387        }
 388}
 389
 390static void print_ok_ref_status(struct ref *ref, int porcelain, int summary_width)
 391{
 392        if (ref->deletion)
 393                print_ref_status('-', "[deleted]", ref, NULL, NULL,
 394                                 porcelain, summary_width);
 395        else if (is_null_oid(&ref->old_oid))
 396                print_ref_status('*',
 397                        (starts_with(ref->name, "refs/tags/") ? "[new tag]" :
 398                        "[new branch]"),
 399                        ref, ref->peer_ref, NULL, porcelain, summary_width);
 400        else {
 401                struct strbuf quickref = STRBUF_INIT;
 402                char type;
 403                const char *msg;
 404
 405                strbuf_add_unique_abbrev(&quickref, &ref->old_oid,
 406                                         DEFAULT_ABBREV);
 407                if (ref->forced_update) {
 408                        strbuf_addstr(&quickref, "...");
 409                        type = '+';
 410                        msg = "forced update";
 411                } else {
 412                        strbuf_addstr(&quickref, "..");
 413                        type = ' ';
 414                        msg = NULL;
 415                }
 416                strbuf_add_unique_abbrev(&quickref, &ref->new_oid,
 417                                         DEFAULT_ABBREV);
 418
 419                print_ref_status(type, quickref.buf, ref, ref->peer_ref, msg,
 420                                 porcelain, summary_width);
 421                strbuf_release(&quickref);
 422        }
 423}
 424
 425static int print_one_push_status(struct ref *ref, const char *dest, int count,
 426                                 int porcelain, int summary_width)
 427{
 428        if (!count) {
 429                char *url = transport_anonymize_url(dest);
 430                fprintf(porcelain ? stdout : stderr, "To %s\n", url);
 431                free(url);
 432        }
 433
 434        switch(ref->status) {
 435        case REF_STATUS_NONE:
 436                print_ref_status('X', "[no match]", ref, NULL, NULL,
 437                                 porcelain, summary_width);
 438                break;
 439        case REF_STATUS_REJECT_NODELETE:
 440                print_ref_status('!', "[rejected]", ref, NULL,
 441                                 "remote does not support deleting refs",
 442                                 porcelain, summary_width);
 443                break;
 444        case REF_STATUS_UPTODATE:
 445                print_ref_status('=', "[up to date]", ref,
 446                                 ref->peer_ref, NULL, porcelain, summary_width);
 447                break;
 448        case REF_STATUS_REJECT_NONFASTFORWARD:
 449                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 450                                 "non-fast-forward", porcelain, summary_width);
 451                break;
 452        case REF_STATUS_REJECT_ALREADY_EXISTS:
 453                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 454                                 "already exists", porcelain, summary_width);
 455                break;
 456        case REF_STATUS_REJECT_FETCH_FIRST:
 457                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 458                                 "fetch first", porcelain, summary_width);
 459                break;
 460        case REF_STATUS_REJECT_NEEDS_FORCE:
 461                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 462                                 "needs force", porcelain, summary_width);
 463                break;
 464        case REF_STATUS_REJECT_STALE:
 465                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 466                                 "stale info", porcelain, summary_width);
 467                break;
 468        case REF_STATUS_REJECT_SHALLOW:
 469                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 470                                 "new shallow roots not allowed",
 471                                 porcelain, summary_width);
 472                break;
 473        case REF_STATUS_REMOTE_REJECT:
 474                print_ref_status('!', "[remote rejected]", ref,
 475                                 ref->deletion ? NULL : ref->peer_ref,
 476                                 ref->remote_status, porcelain, summary_width);
 477                break;
 478        case REF_STATUS_EXPECTING_REPORT:
 479                print_ref_status('!', "[remote failure]", ref,
 480                                 ref->deletion ? NULL : ref->peer_ref,
 481                                 "remote failed to report status",
 482                                 porcelain, summary_width);
 483                break;
 484        case REF_STATUS_ATOMIC_PUSH_FAILED:
 485                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 486                                 "atomic push failed", porcelain, summary_width);
 487                break;
 488        case REF_STATUS_OK:
 489                print_ok_ref_status(ref, porcelain, summary_width);
 490                break;
 491        }
 492
 493        return 1;
 494}
 495
 496static int measure_abbrev(const struct object_id *oid, int sofar)
 497{
 498        char hex[GIT_MAX_HEXSZ + 1];
 499        int w = find_unique_abbrev_r(hex, oid, DEFAULT_ABBREV);
 500
 501        return (w < sofar) ? sofar : w;
 502}
 503
 504int transport_summary_width(const struct ref *refs)
 505{
 506        int maxw = -1;
 507
 508        for (; refs; refs = refs->next) {
 509                maxw = measure_abbrev(&refs->old_oid, maxw);
 510                maxw = measure_abbrev(&refs->new_oid, maxw);
 511        }
 512        if (maxw < 0)
 513                maxw = FALLBACK_DEFAULT_ABBREV;
 514        return (2 * maxw + 3);
 515}
 516
 517void transport_print_push_status(const char *dest, struct ref *refs,
 518                                  int verbose, int porcelain, unsigned int *reject_reasons)
 519{
 520        struct ref *ref;
 521        int n = 0;
 522        char *head;
 523        int summary_width = transport_summary_width(refs);
 524
 525        head = resolve_refdup("HEAD", RESOLVE_REF_READING, NULL, NULL);
 526
 527        if (verbose) {
 528                for (ref = refs; ref; ref = ref->next)
 529                        if (ref->status == REF_STATUS_UPTODATE)
 530                                n += print_one_push_status(ref, dest, n,
 531                                                           porcelain, summary_width);
 532        }
 533
 534        for (ref = refs; ref; ref = ref->next)
 535                if (ref->status == REF_STATUS_OK)
 536                        n += print_one_push_status(ref, dest, n,
 537                                                   porcelain, summary_width);
 538
 539        *reject_reasons = 0;
 540        for (ref = refs; ref; ref = ref->next) {
 541                if (ref->status != REF_STATUS_NONE &&
 542                    ref->status != REF_STATUS_UPTODATE &&
 543                    ref->status != REF_STATUS_OK)
 544                        n += print_one_push_status(ref, dest, n,
 545                                                   porcelain, summary_width);
 546                if (ref->status == REF_STATUS_REJECT_NONFASTFORWARD) {
 547                        if (head != NULL && !strcmp(head, ref->name))
 548                                *reject_reasons |= REJECT_NON_FF_HEAD;
 549                        else
 550                                *reject_reasons |= REJECT_NON_FF_OTHER;
 551                } else if (ref->status == REF_STATUS_REJECT_ALREADY_EXISTS) {
 552                        *reject_reasons |= REJECT_ALREADY_EXISTS;
 553                } else if (ref->status == REF_STATUS_REJECT_FETCH_FIRST) {
 554                        *reject_reasons |= REJECT_FETCH_FIRST;
 555                } else if (ref->status == REF_STATUS_REJECT_NEEDS_FORCE) {
 556                        *reject_reasons |= REJECT_NEEDS_FORCE;
 557                }
 558        }
 559        free(head);
 560}
 561
 562void transport_verify_remote_names(int nr_heads, const char **heads)
 563{
 564        int i;
 565
 566        for (i = 0; i < nr_heads; i++) {
 567                const char *local = heads[i];
 568                const char *remote = strrchr(heads[i], ':');
 569
 570                if (*local == '+')
 571                        local++;
 572
 573                /* A matching refspec is okay.  */
 574                if (remote == local && remote[1] == '\0')
 575                        continue;
 576
 577                remote = remote ? (remote + 1) : local;
 578                if (check_refname_format(remote,
 579                                REFNAME_ALLOW_ONELEVEL|REFNAME_REFSPEC_PATTERN))
 580                        die("remote part of refspec is not a valid name in %s",
 581                                heads[i]);
 582        }
 583}
 584
 585static int git_transport_push(struct transport *transport, struct ref *remote_refs, int flags)
 586{
 587        struct git_transport_data *data = transport->data;
 588        struct send_pack_args args;
 589        int ret = 0;
 590
 591        if (!data->got_remote_heads)
 592                get_refs_via_connect(transport, 1, NULL);
 593
 594        memset(&args, 0, sizeof(args));
 595        args.send_mirror = !!(flags & TRANSPORT_PUSH_MIRROR);
 596        args.force_update = !!(flags & TRANSPORT_PUSH_FORCE);
 597        args.use_thin_pack = data->options.thin;
 598        args.verbose = (transport->verbose > 0);
 599        args.quiet = (transport->verbose < 0);
 600        args.progress = transport->progress;
 601        args.dry_run = !!(flags & TRANSPORT_PUSH_DRY_RUN);
 602        args.porcelain = !!(flags & TRANSPORT_PUSH_PORCELAIN);
 603        args.atomic = !!(flags & TRANSPORT_PUSH_ATOMIC);
 604        args.push_options = transport->push_options;
 605        args.url = transport->url;
 606
 607        if (flags & TRANSPORT_PUSH_CERT_ALWAYS)
 608                args.push_cert = SEND_PACK_PUSH_CERT_ALWAYS;
 609        else if (flags & TRANSPORT_PUSH_CERT_IF_ASKED)
 610                args.push_cert = SEND_PACK_PUSH_CERT_IF_ASKED;
 611        else
 612                args.push_cert = SEND_PACK_PUSH_CERT_NEVER;
 613
 614        switch (data->version) {
 615        case protocol_v2:
 616                die("support for protocol v2 not implemented yet");
 617                break;
 618        case protocol_v1:
 619        case protocol_v0:
 620                ret = send_pack(&args, data->fd, data->conn, remote_refs,
 621                                &data->extra_have);
 622                break;
 623        case protocol_unknown_version:
 624                BUG("unknown protocol version");
 625        }
 626
 627        close(data->fd[1]);
 628        close(data->fd[0]);
 629        ret |= finish_connect(data->conn);
 630        data->conn = NULL;
 631        data->got_remote_heads = 0;
 632
 633        return ret;
 634}
 635
 636static int connect_git(struct transport *transport, const char *name,
 637                       const char *executable, int fd[2])
 638{
 639        struct git_transport_data *data = transport->data;
 640        data->conn = git_connect(data->fd, transport->url,
 641                                 executable, 0);
 642        fd[0] = data->fd[0];
 643        fd[1] = data->fd[1];
 644        return 0;
 645}
 646
 647static int disconnect_git(struct transport *transport)
 648{
 649        struct git_transport_data *data = transport->data;
 650        if (data->conn) {
 651                if (data->got_remote_heads)
 652                        packet_flush(data->fd[1]);
 653                close(data->fd[0]);
 654                close(data->fd[1]);
 655                finish_connect(data->conn);
 656        }
 657
 658        free(data);
 659        return 0;
 660}
 661
 662static struct transport_vtable taken_over_vtable = {
 663        NULL,
 664        get_refs_via_connect,
 665        fetch_refs_via_pack,
 666        git_transport_push,
 667        NULL,
 668        disconnect_git
 669};
 670
 671void transport_take_over(struct transport *transport,
 672                         struct child_process *child)
 673{
 674        struct git_transport_data *data;
 675
 676        if (!transport->smart_options)
 677                die("BUG: taking over transport requires non-NULL "
 678                    "smart_options field.");
 679
 680        data = xcalloc(1, sizeof(*data));
 681        data->options = *transport->smart_options;
 682        data->conn = child;
 683        data->fd[0] = data->conn->out;
 684        data->fd[1] = data->conn->in;
 685        data->got_remote_heads = 0;
 686        transport->data = data;
 687
 688        transport->vtable = &taken_over_vtable;
 689        transport->smart_options = &(data->options);
 690
 691        transport->cannot_reuse = 1;
 692}
 693
 694static int is_file(const char *url)
 695{
 696        struct stat buf;
 697        if (stat(url, &buf))
 698                return 0;
 699        return S_ISREG(buf.st_mode);
 700}
 701
 702static int external_specification_len(const char *url)
 703{
 704        return strchr(url, ':') - url;
 705}
 706
 707static const struct string_list *protocol_whitelist(void)
 708{
 709        static int enabled = -1;
 710        static struct string_list allowed = STRING_LIST_INIT_DUP;
 711
 712        if (enabled < 0) {
 713                const char *v = getenv("GIT_ALLOW_PROTOCOL");
 714                if (v) {
 715                        string_list_split(&allowed, v, ':', -1);
 716                        string_list_sort(&allowed);
 717                        enabled = 1;
 718                } else {
 719                        enabled = 0;
 720                }
 721        }
 722
 723        return enabled ? &allowed : NULL;
 724}
 725
 726enum protocol_allow_config {
 727        PROTOCOL_ALLOW_NEVER = 0,
 728        PROTOCOL_ALLOW_USER_ONLY,
 729        PROTOCOL_ALLOW_ALWAYS
 730};
 731
 732static enum protocol_allow_config parse_protocol_config(const char *key,
 733                                                        const char *value)
 734{
 735        if (!strcasecmp(value, "always"))
 736                return PROTOCOL_ALLOW_ALWAYS;
 737        else if (!strcasecmp(value, "never"))
 738                return PROTOCOL_ALLOW_NEVER;
 739        else if (!strcasecmp(value, "user"))
 740                return PROTOCOL_ALLOW_USER_ONLY;
 741
 742        die("unknown value for config '%s': %s", key, value);
 743}
 744
 745static enum protocol_allow_config get_protocol_config(const char *type)
 746{
 747        char *key = xstrfmt("protocol.%s.allow", type);
 748        char *value;
 749
 750        /* first check the per-protocol config */
 751        if (!git_config_get_string(key, &value)) {
 752                enum protocol_allow_config ret =
 753                        parse_protocol_config(key, value);
 754                free(key);
 755                free(value);
 756                return ret;
 757        }
 758        free(key);
 759
 760        /* if defined, fallback to user-defined default for unknown protocols */
 761        if (!git_config_get_string("protocol.allow", &value)) {
 762                enum protocol_allow_config ret =
 763                        parse_protocol_config("protocol.allow", value);
 764                free(value);
 765                return ret;
 766        }
 767
 768        /* fallback to built-in defaults */
 769        /* known safe */
 770        if (!strcmp(type, "http") ||
 771            !strcmp(type, "https") ||
 772            !strcmp(type, "git") ||
 773            !strcmp(type, "ssh") ||
 774            !strcmp(type, "file"))
 775                return PROTOCOL_ALLOW_ALWAYS;
 776
 777        /* known scary; err on the side of caution */
 778        if (!strcmp(type, "ext"))
 779                return PROTOCOL_ALLOW_NEVER;
 780
 781        /* unknown; by default let them be used only directly by the user */
 782        return PROTOCOL_ALLOW_USER_ONLY;
 783}
 784
 785int is_transport_allowed(const char *type, int from_user)
 786{
 787        const struct string_list *whitelist = protocol_whitelist();
 788        if (whitelist)
 789                return string_list_has_string(whitelist, type);
 790
 791        switch (get_protocol_config(type)) {
 792        case PROTOCOL_ALLOW_ALWAYS:
 793                return 1;
 794        case PROTOCOL_ALLOW_NEVER:
 795                return 0;
 796        case PROTOCOL_ALLOW_USER_ONLY:
 797                if (from_user < 0)
 798                        from_user = git_env_bool("GIT_PROTOCOL_FROM_USER", 1);
 799                return from_user;
 800        }
 801
 802        die("BUG: invalid protocol_allow_config type");
 803}
 804
 805void transport_check_allowed(const char *type)
 806{
 807        if (!is_transport_allowed(type, -1))
 808                die("transport '%s' not allowed", type);
 809}
 810
 811static struct transport_vtable bundle_vtable = {
 812        NULL,
 813        get_refs_from_bundle,
 814        fetch_refs_from_bundle,
 815        NULL,
 816        NULL,
 817        close_bundle
 818};
 819
 820static struct transport_vtable builtin_smart_vtable = {
 821        NULL,
 822        get_refs_via_connect,
 823        fetch_refs_via_pack,
 824        git_transport_push,
 825        connect_git,
 826        disconnect_git
 827};
 828
 829struct transport *transport_get(struct remote *remote, const char *url)
 830{
 831        const char *helper;
 832        struct transport *ret = xcalloc(1, sizeof(*ret));
 833
 834        ret->progress = isatty(2);
 835
 836        if (!remote)
 837                die("No remote provided to transport_get()");
 838
 839        ret->got_remote_refs = 0;
 840        ret->remote = remote;
 841        helper = remote->foreign_vcs;
 842
 843        if (!url && remote->url)
 844                url = remote->url[0];
 845        ret->url = url;
 846
 847        /* maybe it is a foreign URL? */
 848        if (url) {
 849                const char *p = url;
 850
 851                while (is_urlschemechar(p == url, *p))
 852                        p++;
 853                if (starts_with(p, "::"))
 854                        helper = xstrndup(url, p - url);
 855        }
 856
 857        if (helper) {
 858                transport_helper_init(ret, helper);
 859        } else if (starts_with(url, "rsync:")) {
 860                die("git-over-rsync is no longer supported");
 861        } else if (url_is_local_not_ssh(url) && is_file(url) && is_bundle(url, 1)) {
 862                struct bundle_transport_data *data = xcalloc(1, sizeof(*data));
 863                transport_check_allowed("file");
 864                ret->data = data;
 865                ret->vtable = &bundle_vtable;
 866                ret->smart_options = NULL;
 867        } else if (!is_url(url)
 868                || starts_with(url, "file://")
 869                || starts_with(url, "git://")
 870                || starts_with(url, "ssh://")
 871                || starts_with(url, "git+ssh://") /* deprecated - do not use */
 872                || starts_with(url, "ssh+git://") /* deprecated - do not use */
 873                ) {
 874                /*
 875                 * These are builtin smart transports; "allowed" transports
 876                 * will be checked individually in git_connect.
 877                 */
 878                struct git_transport_data *data = xcalloc(1, sizeof(*data));
 879                ret->data = data;
 880                ret->vtable = &builtin_smart_vtable;
 881                ret->smart_options = &(data->options);
 882
 883                data->conn = NULL;
 884                data->got_remote_heads = 0;
 885        } else {
 886                /* Unknown protocol in URL. Pass to external handler. */
 887                int len = external_specification_len(url);
 888                char *handler = xmemdupz(url, len);
 889                transport_helper_init(ret, handler);
 890        }
 891
 892        if (ret->smart_options) {
 893                ret->smart_options->thin = 1;
 894                ret->smart_options->uploadpack = "git-upload-pack";
 895                if (remote->uploadpack)
 896                        ret->smart_options->uploadpack = remote->uploadpack;
 897                ret->smart_options->receivepack = "git-receive-pack";
 898                if (remote->receivepack)
 899                        ret->smart_options->receivepack = remote->receivepack;
 900        }
 901
 902        return ret;
 903}
 904
 905int transport_set_option(struct transport *transport,
 906                         const char *name, const char *value)
 907{
 908        int git_reports = 1, protocol_reports = 1;
 909
 910        if (transport->smart_options)
 911                git_reports = set_git_option(transport->smart_options,
 912                                             name, value);
 913
 914        if (transport->vtable->set_option)
 915                protocol_reports = transport->vtable->set_option(transport,
 916                                                                 name, value);
 917
 918        /* If either report is 0, report 0 (success). */
 919        if (!git_reports || !protocol_reports)
 920                return 0;
 921        /* If either reports -1 (invalid value), report -1. */
 922        if ((git_reports == -1) || (protocol_reports == -1))
 923                return -1;
 924        /* Otherwise if both report unknown, report unknown. */
 925        return 1;
 926}
 927
 928void transport_set_verbosity(struct transport *transport, int verbosity,
 929        int force_progress)
 930{
 931        if (verbosity >= 1)
 932                transport->verbose = verbosity <= 3 ? verbosity : 3;
 933        if (verbosity < 0)
 934                transport->verbose = -1;
 935
 936        /**
 937         * Rules used to determine whether to report progress (processing aborts
 938         * when a rule is satisfied):
 939         *
 940         *   . Report progress, if force_progress is 1 (ie. --progress).
 941         *   . Don't report progress, if force_progress is 0 (ie. --no-progress).
 942         *   . Don't report progress, if verbosity < 0 (ie. -q/--quiet ).
 943         *   . Report progress if isatty(2) is 1.
 944         **/
 945        if (force_progress >= 0)
 946                transport->progress = !!force_progress;
 947        else
 948                transport->progress = verbosity >= 0 && isatty(2);
 949}
 950
 951static void die_with_unpushed_submodules(struct string_list *needs_pushing)
 952{
 953        int i;
 954
 955        fprintf(stderr, _("The following submodule paths contain changes that can\n"
 956                        "not be found on any remote:\n"));
 957        for (i = 0; i < needs_pushing->nr; i++)
 958                fprintf(stderr, "  %s\n", needs_pushing->items[i].string);
 959        fprintf(stderr, _("\nPlease try\n\n"
 960                          "     git push --recurse-submodules=on-demand\n\n"
 961                          "or cd to the path and use\n\n"
 962                          "     git push\n\n"
 963                          "to push them to a remote.\n\n"));
 964
 965        string_list_clear(needs_pushing, 0);
 966
 967        die(_("Aborting."));
 968}
 969
 970static int run_pre_push_hook(struct transport *transport,
 971                             struct ref *remote_refs)
 972{
 973        int ret = 0, x;
 974        struct ref *r;
 975        struct child_process proc = CHILD_PROCESS_INIT;
 976        struct strbuf buf;
 977        const char *argv[4];
 978
 979        if (!(argv[0] = find_hook("pre-push")))
 980                return 0;
 981
 982        argv[1] = transport->remote->name;
 983        argv[2] = transport->url;
 984        argv[3] = NULL;
 985
 986        proc.argv = argv;
 987        proc.in = -1;
 988
 989        if (start_command(&proc)) {
 990                finish_command(&proc);
 991                return -1;
 992        }
 993
 994        sigchain_push(SIGPIPE, SIG_IGN);
 995
 996        strbuf_init(&buf, 256);
 997
 998        for (r = remote_refs; r; r = r->next) {
 999                if (!r->peer_ref) continue;
1000                if (r->status == REF_STATUS_REJECT_NONFASTFORWARD) continue;
1001                if (r->status == REF_STATUS_REJECT_STALE) continue;
1002                if (r->status == REF_STATUS_UPTODATE) continue;
1003
1004                strbuf_reset(&buf);
1005                strbuf_addf( &buf, "%s %s %s %s\n",
1006                         r->peer_ref->name, oid_to_hex(&r->new_oid),
1007                         r->name, oid_to_hex(&r->old_oid));
1008
1009                if (write_in_full(proc.in, buf.buf, buf.len) < 0) {
1010                        /* We do not mind if a hook does not read all refs. */
1011                        if (errno != EPIPE)
1012                                ret = -1;
1013                        break;
1014                }
1015        }
1016
1017        strbuf_release(&buf);
1018
1019        x = close(proc.in);
1020        if (!ret)
1021                ret = x;
1022
1023        sigchain_pop(SIGPIPE);
1024
1025        x = finish_command(&proc);
1026        if (!ret)
1027                ret = x;
1028
1029        return ret;
1030}
1031
1032int transport_push(struct transport *transport,
1033                   int refspec_nr, const char **refspec, int flags,
1034                   unsigned int *reject_reasons)
1035{
1036        *reject_reasons = 0;
1037        transport_verify_remote_names(refspec_nr, refspec);
1038
1039        if (transport->vtable->push_refs) {
1040                struct ref *remote_refs;
1041                struct ref *local_refs = get_local_heads();
1042                int match_flags = MATCH_REFS_NONE;
1043                int verbose = (transport->verbose > 0);
1044                int quiet = (transport->verbose < 0);
1045                int porcelain = flags & TRANSPORT_PUSH_PORCELAIN;
1046                int pretend = flags & TRANSPORT_PUSH_DRY_RUN;
1047                int push_ret, ret, err;
1048                struct refspec *tmp_rs;
1049                struct argv_array ref_prefixes = ARGV_ARRAY_INIT;
1050                int i;
1051
1052                if (check_push_refs(local_refs, refspec_nr, refspec) < 0)
1053                        return -1;
1054
1055                tmp_rs = parse_push_refspec(refspec_nr, refspec);
1056                for (i = 0; i < refspec_nr; i++) {
1057                        const char *prefix = NULL;
1058
1059                        if (tmp_rs[i].dst)
1060                                prefix = tmp_rs[i].dst;
1061                        else if (tmp_rs[i].src && !tmp_rs[i].exact_sha1)
1062                                prefix = tmp_rs[i].src;
1063
1064                        if (prefix) {
1065                                const char *glob = strchr(prefix, '*');
1066                                if (glob)
1067                                        argv_array_pushf(&ref_prefixes, "%.*s",
1068                                                         (int)(glob - prefix),
1069                                                         prefix);
1070                                else
1071                                        expand_ref_prefix(&ref_prefixes, prefix);
1072                        }
1073                }
1074
1075                remote_refs = transport->vtable->get_refs_list(transport, 1,
1076                                                               &ref_prefixes);
1077
1078                argv_array_clear(&ref_prefixes);
1079                free_refspec(refspec_nr, tmp_rs);
1080
1081                if (flags & TRANSPORT_PUSH_ALL)
1082                        match_flags |= MATCH_REFS_ALL;
1083                if (flags & TRANSPORT_PUSH_MIRROR)
1084                        match_flags |= MATCH_REFS_MIRROR;
1085                if (flags & TRANSPORT_PUSH_PRUNE)
1086                        match_flags |= MATCH_REFS_PRUNE;
1087                if (flags & TRANSPORT_PUSH_FOLLOW_TAGS)
1088                        match_flags |= MATCH_REFS_FOLLOW_TAGS;
1089
1090                if (match_push_refs(local_refs, &remote_refs,
1091                                    refspec_nr, refspec, match_flags)) {
1092                        return -1;
1093                }
1094
1095                if (transport->smart_options &&
1096                    transport->smart_options->cas &&
1097                    !is_empty_cas(transport->smart_options->cas))
1098                        apply_push_cas(transport->smart_options->cas,
1099                                       transport->remote, remote_refs);
1100
1101                set_ref_status_for_push(remote_refs,
1102                        flags & TRANSPORT_PUSH_MIRROR,
1103                        flags & TRANSPORT_PUSH_FORCE);
1104
1105                if (!(flags & TRANSPORT_PUSH_NO_HOOK))
1106                        if (run_pre_push_hook(transport, remote_refs))
1107                                return -1;
1108
1109                if ((flags & (TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND |
1110                              TRANSPORT_RECURSE_SUBMODULES_ONLY)) &&
1111                    !is_bare_repository()) {
1112                        struct ref *ref = remote_refs;
1113                        struct oid_array commits = OID_ARRAY_INIT;
1114
1115                        for (; ref; ref = ref->next)
1116                                if (!is_null_oid(&ref->new_oid))
1117                                        oid_array_append(&commits,
1118                                                          &ref->new_oid);
1119
1120                        if (!push_unpushed_submodules(&commits,
1121                                                      transport->remote,
1122                                                      refspec, refspec_nr,
1123                                                      transport->push_options,
1124                                                      pretend)) {
1125                                oid_array_clear(&commits);
1126                                die("Failed to push all needed submodules!");
1127                        }
1128                        oid_array_clear(&commits);
1129                }
1130
1131                if (((flags & TRANSPORT_RECURSE_SUBMODULES_CHECK) ||
1132                     ((flags & (TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND |
1133                                TRANSPORT_RECURSE_SUBMODULES_ONLY)) &&
1134                      !pretend)) && !is_bare_repository()) {
1135                        struct ref *ref = remote_refs;
1136                        struct string_list needs_pushing = STRING_LIST_INIT_DUP;
1137                        struct oid_array commits = OID_ARRAY_INIT;
1138
1139                        for (; ref; ref = ref->next)
1140                                if (!is_null_oid(&ref->new_oid))
1141                                        oid_array_append(&commits,
1142                                                          &ref->new_oid);
1143
1144                        if (find_unpushed_submodules(&commits, transport->remote->name,
1145                                                &needs_pushing)) {
1146                                oid_array_clear(&commits);
1147                                die_with_unpushed_submodules(&needs_pushing);
1148                        }
1149                        string_list_clear(&needs_pushing, 0);
1150                        oid_array_clear(&commits);
1151                }
1152
1153                if (!(flags & TRANSPORT_RECURSE_SUBMODULES_ONLY))
1154                        push_ret = transport->vtable->push_refs(transport, remote_refs, flags);
1155                else
1156                        push_ret = 0;
1157                err = push_had_errors(remote_refs);
1158                ret = push_ret | err;
1159
1160                if (!quiet || err)
1161                        transport_print_push_status(transport->url, remote_refs,
1162                                        verbose | porcelain, porcelain,
1163                                        reject_reasons);
1164
1165                if (flags & TRANSPORT_PUSH_SET_UPSTREAM)
1166                        set_upstreams(transport, remote_refs, pretend);
1167
1168                if (!(flags & (TRANSPORT_PUSH_DRY_RUN |
1169                               TRANSPORT_RECURSE_SUBMODULES_ONLY))) {
1170                        struct ref *ref;
1171                        for (ref = remote_refs; ref; ref = ref->next)
1172                                transport_update_tracking_ref(transport->remote, ref, verbose);
1173                }
1174
1175                if (porcelain && !push_ret)
1176                        puts("Done");
1177                else if (!quiet && !ret && !transport_refs_pushed(remote_refs))
1178                        fprintf(stderr, "Everything up-to-date\n");
1179
1180                return ret;
1181        }
1182        return 1;
1183}
1184
1185const struct ref *transport_get_remote_refs(struct transport *transport,
1186                                            const struct argv_array *ref_prefixes)
1187{
1188        if (!transport->got_remote_refs) {
1189                transport->remote_refs =
1190                        transport->vtable->get_refs_list(transport, 0,
1191                                                         ref_prefixes);
1192                transport->got_remote_refs = 1;
1193        }
1194
1195        return transport->remote_refs;
1196}
1197
1198int transport_fetch_refs(struct transport *transport, struct ref *refs)
1199{
1200        int rc;
1201        int nr_heads = 0, nr_alloc = 0, nr_refs = 0;
1202        struct ref **heads = NULL;
1203        struct ref *rm;
1204
1205        for (rm = refs; rm; rm = rm->next) {
1206                nr_refs++;
1207                if (rm->peer_ref &&
1208                    !is_null_oid(&rm->old_oid) &&
1209                    !oidcmp(&rm->peer_ref->old_oid, &rm->old_oid))
1210                        continue;
1211                ALLOC_GROW(heads, nr_heads + 1, nr_alloc);
1212                heads[nr_heads++] = rm;
1213        }
1214
1215        if (!nr_heads) {
1216                /*
1217                 * When deepening of a shallow repository is requested,
1218                 * then local and remote refs are likely to still be equal.
1219                 * Just feed them all to the fetch method in that case.
1220                 * This condition shouldn't be met in a non-deepening fetch
1221                 * (see builtin/fetch.c:quickfetch()).
1222                 */
1223                ALLOC_ARRAY(heads, nr_refs);
1224                for (rm = refs; rm; rm = rm->next)
1225                        heads[nr_heads++] = rm;
1226        }
1227
1228        rc = transport->vtable->fetch(transport, nr_heads, heads);
1229
1230        free(heads);
1231        return rc;
1232}
1233
1234void transport_unlock_pack(struct transport *transport)
1235{
1236        if (transport->pack_lockfile) {
1237                unlink_or_warn(transport->pack_lockfile);
1238                FREE_AND_NULL(transport->pack_lockfile);
1239        }
1240}
1241
1242int transport_connect(struct transport *transport, const char *name,
1243                      const char *exec, int fd[2])
1244{
1245        if (transport->vtable->connect)
1246                return transport->vtable->connect(transport, name, exec, fd);
1247        else
1248                die("Operation not supported by protocol");
1249}
1250
1251int transport_disconnect(struct transport *transport)
1252{
1253        int ret = 0;
1254        if (transport->vtable->disconnect)
1255                ret = transport->vtable->disconnect(transport);
1256        free(transport);
1257        return ret;
1258}
1259
1260/*
1261 * Strip username (and password) from a URL and return
1262 * it in a newly allocated string.
1263 */
1264char *transport_anonymize_url(const char *url)
1265{
1266        char *scheme_prefix, *anon_part;
1267        size_t anon_len, prefix_len = 0;
1268
1269        anon_part = strchr(url, '@');
1270        if (url_is_local_not_ssh(url) || !anon_part)
1271                goto literal_copy;
1272
1273        anon_len = strlen(++anon_part);
1274        scheme_prefix = strstr(url, "://");
1275        if (!scheme_prefix) {
1276                if (!strchr(anon_part, ':'))
1277                        /* cannot be "me@there:/path/name" */
1278                        goto literal_copy;
1279        } else {
1280                const char *cp;
1281                /* make sure scheme is reasonable */
1282                for (cp = url; cp < scheme_prefix; cp++) {
1283                        switch (*cp) {
1284                                /* RFC 1738 2.1 */
1285                        case '+': case '.': case '-':
1286                                break; /* ok */
1287                        default:
1288                                if (isalnum(*cp))
1289                                        break;
1290                                /* it isn't */
1291                                goto literal_copy;
1292                        }
1293                }
1294                /* @ past the first slash does not count */
1295                cp = strchr(scheme_prefix + 3, '/');
1296                if (cp && cp < anon_part)
1297                        goto literal_copy;
1298                prefix_len = scheme_prefix - url + 3;
1299        }
1300        return xstrfmt("%.*s%.*s", (int)prefix_len, url,
1301                       (int)anon_len, anon_part);
1302literal_copy:
1303        return xstrdup(url);
1304}
1305
1306static void read_alternate_refs(const char *path,
1307                                alternate_ref_fn *cb,
1308                                void *data)
1309{
1310        struct child_process cmd = CHILD_PROCESS_INIT;
1311        struct strbuf line = STRBUF_INIT;
1312        FILE *fh;
1313
1314        cmd.git_cmd = 1;
1315        argv_array_pushf(&cmd.args, "--git-dir=%s", path);
1316        argv_array_push(&cmd.args, "for-each-ref");
1317        argv_array_push(&cmd.args, "--format=%(objectname) %(refname)");
1318        cmd.env = local_repo_env;
1319        cmd.out = -1;
1320
1321        if (start_command(&cmd))
1322                return;
1323
1324        fh = xfdopen(cmd.out, "r");
1325        while (strbuf_getline_lf(&line, fh) != EOF) {
1326                struct object_id oid;
1327
1328                if (get_oid_hex(line.buf, &oid) ||
1329                    line.buf[GIT_SHA1_HEXSZ] != ' ') {
1330                        warning("invalid line while parsing alternate refs: %s",
1331                                line.buf);
1332                        break;
1333                }
1334
1335                cb(line.buf + GIT_SHA1_HEXSZ + 1, &oid, data);
1336        }
1337
1338        fclose(fh);
1339        finish_command(&cmd);
1340}
1341
1342struct alternate_refs_data {
1343        alternate_ref_fn *fn;
1344        void *data;
1345};
1346
1347static int refs_from_alternate_cb(struct alternate_object_database *e,
1348                                  void *data)
1349{
1350        struct strbuf path = STRBUF_INIT;
1351        size_t base_len;
1352        struct alternate_refs_data *cb = data;
1353
1354        if (!strbuf_realpath(&path, e->path, 0))
1355                goto out;
1356        if (!strbuf_strip_suffix(&path, "/objects"))
1357                goto out;
1358        base_len = path.len;
1359
1360        /* Is this a git repository with refs? */
1361        strbuf_addstr(&path, "/refs");
1362        if (!is_directory(path.buf))
1363                goto out;
1364        strbuf_setlen(&path, base_len);
1365
1366        read_alternate_refs(path.buf, cb->fn, cb->data);
1367
1368out:
1369        strbuf_release(&path);
1370        return 0;
1371}
1372
1373void for_each_alternate_ref(alternate_ref_fn fn, void *data)
1374{
1375        struct alternate_refs_data cb;
1376        cb.fn = fn;
1377        cb.data = data;
1378        foreach_alt_odb(refs_from_alternate_cb, &cb);
1379}