transport.c

   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
  24 static 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
  71 struct bundle_transport_data {
  72         int fd;
  73         struct bundle_header header;
  74 };
  75
  76 static 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
 102 static 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
 110 static 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
 119 struct 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
 129 static 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
 182 static 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
 204 static 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
 238 static 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
 311 static 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
 326 int 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
 340 void 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
 362 static 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
 390 static 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
 425 static 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
 496 static 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
 504 int 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
 517 void 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
 562 void 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
 585 static 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
 636 static 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
 647 static 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
 662 static 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
 671 void 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
 694 static 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
 702 static int external_specification_len(const char *url)
 703 {
 704         return strchr(url, ':') - url;
 705 }
 706
 707 static 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
 726 enum protocol_allow_config {
 727         PROTOCOL_ALLOW_NEVER = 0,
 728         PROTOCOL_ALLOW_USER_ONLY,
 729         PROTOCOL_ALLOW_ALWAYS
 730 };
 731
 732 static 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
 745 static 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
 785 int 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
 805 void transport_check_allowed(const char *type)
 806 {
 807         if (!is_transport_allowed(type, -1))
 808                 die("transport '%s' not allowed", type);
 809 }
 810
 811 static 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
 820 static 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
 829 struct 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
 905 int 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
 928 void 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
 951 static 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
 970 static 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
1032 int 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
1185 const 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
1198 int 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
1234 void 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
1242 int 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
1251 int 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  */
1264 char *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);
1302 literal_copy:
1303         return xstrdup(url);
1304 }
1305
1306 static 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
1342 struct alternate_refs_data {
1343         alternate_ref_fn *fn;
1344         void *data;
1345 };
1346
1347 static 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
1368 out:
1369         strbuf_release(&path);
1370         return 0;
1371 }
1372
1373 void 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 }