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