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 "refspec.h"
  15 #include "branch.h"
  16 #include "url.h"
  17 #include "submodule.h"
  18 #include "string-list.h"
  19 #include "sha1-array.h"
  20 #include "sigchain.h"
  21 #include "transport-internal.h"
  22 #include "protocol.h"
  23 #include "object-store.h"
  24 #include "color.h"
  25
  26 static int transport_use_color = -1;
  27 static char transport_colors[][COLOR_MAXLEN] = {
  28         GIT_COLOR_RESET,
  29         GIT_COLOR_RED           /* REJECTED */
  30 };
  31
  32 enum color_transport {
  33         TRANSPORT_COLOR_RESET = 0,
  34         TRANSPORT_COLOR_REJECTED = 1
  35 };
  36
  37 static int transport_color_config(void)
  38 {
  39         const char *keys[] = {
  40                 "color.transport.reset",
  41                 "color.transport.rejected"
  42         }, *key = "color.transport";
  43         char *value;
  44         int i;
  45         static int initialized;
  46
  47         if (initialized)
  48                 return 0;
  49         initialized = 1;
  50
  51         if (!git_config_get_string(key, &value))
  52                 transport_use_color = git_config_colorbool(key, value);
  53
  54         if (!want_color_stderr(transport_use_color))
  55                 return 0;
  56
  57         for (i = 0; i < ARRAY_SIZE(keys); i++)
  58                 if (!git_config_get_string(keys[i], &value)) {
  59                         if (!value)
  60                                 return config_error_nonbool(keys[i]);
  61                         if (color_parse(value, transport_colors[i]) < 0)
  62                                 return -1;
  63                 }
  64
  65         return 0;
  66 }
  67
  68 static const char *transport_get_color(enum color_transport ix)
  69 {
  70         if (want_color_stderr(transport_use_color))
  71                 return transport_colors[ix];
  72         return "";
  73 }
  74
  75 static void set_upstreams(struct transport *transport, struct ref *refs,
  76         int pretend)
  77 {
  78         struct ref *ref;
  79         for (ref = refs; ref; ref = ref->next) {
  80                 const char *localname;
  81                 const char *tmp;
  82                 const char *remotename;
  83                 int flag = 0;
  84                 /*
  85                  * Check suitability for tracking. Must be successful /
  86                  * already up-to-date ref create/modify (not delete).
  87                  */
  88                 if (ref->status != REF_STATUS_OK &&
  89                         ref->status != REF_STATUS_UPTODATE)
  90                         continue;
  91                 if (!ref->peer_ref)
  92                         continue;
  93                 if (is_null_oid(&ref->new_oid))
  94                         continue;
  95
  96                 /* Follow symbolic refs (mainly for HEAD). */
  97                 localname = ref->peer_ref->name;
  98                 remotename = ref->name;
  99                 tmp = resolve_ref_unsafe(localname, RESOLVE_REF_READING,
 100                                          NULL, &flag);
 101                 if (tmp && flag & REF_ISSYMREF &&
 102                         starts_with(tmp, "refs/heads/"))
 103                         localname = tmp;
 104
 105                 /* Both source and destination must be local branches. */
 106                 if (!localname || !starts_with(localname, "refs/heads/"))
 107                         continue;
 108                 if (!remotename || !starts_with(remotename, "refs/heads/"))
 109                         continue;
 110
 111                 if (!pretend)
 112                         install_branch_config(BRANCH_CONFIG_VERBOSE,
 113                                 localname + 11, transport->remote->name,
 114                                 remotename);
 115                 else
 116                         printf(_("Would set upstream of '%s' to '%s' of '%s'\n"),
 117                                 localname + 11, remotename + 11,
 118                                 transport->remote->name);
 119         }
 120 }
 121
 122 struct bundle_transport_data {
 123         int fd;
 124         struct bundle_header header;
 125 };
 126
 127 static struct ref *get_refs_from_bundle(struct transport *transport,
 128                                         int for_push,
 129                                         const struct argv_array *ref_prefixes)
 130 {
 131         struct bundle_transport_data *data = transport->data;
 132         struct ref *result = NULL;
 133         int i;
 134
 135         if (for_push)
 136                 return NULL;
 137
 138         if (data->fd > 0)
 139                 close(data->fd);
 140         data->fd = read_bundle_header(transport->url, &data->header);
 141         if (data->fd < 0)
 142                 die ("Could not read bundle '%s'.", transport->url);
 143         for (i = 0; i < data->header.references.nr; i++) {
 144                 struct ref_list_entry *e = data->header.references.list + i;
 145                 struct ref *ref = alloc_ref(e->name);
 146                 oidcpy(&ref->old_oid, &e->oid);
 147                 ref->next = result;
 148                 result = ref;
 149         }
 150         return result;
 151 }
 152
 153 static int fetch_refs_from_bundle(struct transport *transport,
 154                                int nr_heads, struct ref **to_fetch)
 155 {
 156         struct bundle_transport_data *data = transport->data;
 157         return unbundle(&data->header, data->fd,
 158                         transport->progress ? BUNDLE_VERBOSE : 0);
 159 }
 160
 161 static int close_bundle(struct transport *transport)
 162 {
 163         struct bundle_transport_data *data = transport->data;
 164         if (data->fd > 0)
 165                 close(data->fd);
 166         free(data);
 167         return 0;
 168 }
 169
 170 struct git_transport_data {
 171         struct git_transport_options options;
 172         struct child_process *conn;
 173         int fd[2];
 174         unsigned got_remote_heads : 1;
 175         enum protocol_version version;
 176         struct oid_array extra_have;
 177         struct oid_array shallow;
 178 };
 179
 180 static int set_git_option(struct git_transport_options *opts,
 181                           const char *name, const char *value)
 182 {
 183         if (!strcmp(name, TRANS_OPT_UPLOADPACK)) {
 184                 opts->uploadpack = value;
 185                 return 0;
 186         } else if (!strcmp(name, TRANS_OPT_RECEIVEPACK)) {
 187                 opts->receivepack = value;
 188                 return 0;
 189         } else if (!strcmp(name, TRANS_OPT_THIN)) {
 190                 opts->thin = !!value;
 191                 return 0;
 192         } else if (!strcmp(name, TRANS_OPT_FOLLOWTAGS)) {
 193                 opts->followtags = !!value;
 194                 return 0;
 195         } else if (!strcmp(name, TRANS_OPT_KEEP)) {
 196                 opts->keep = !!value;
 197                 return 0;
 198         } else if (!strcmp(name, TRANS_OPT_UPDATE_SHALLOW)) {
 199                 opts->update_shallow = !!value;
 200                 return 0;
 201         } else if (!strcmp(name, TRANS_OPT_DEPTH)) {
 202                 if (!value)
 203                         opts->depth = 0;
 204                 else {
 205                         char *end;
 206                         opts->depth = strtol(value, &end, 0);
 207                         if (*end)
 208                                 die(_("transport: invalid depth option '%s'"), value);
 209                 }
 210                 return 0;
 211         } else if (!strcmp(name, TRANS_OPT_DEEPEN_SINCE)) {
 212                 opts->deepen_since = value;
 213                 return 0;
 214         } else if (!strcmp(name, TRANS_OPT_DEEPEN_NOT)) {
 215                 opts->deepen_not = (const struct string_list *)value;
 216                 return 0;
 217         } else if (!strcmp(name, TRANS_OPT_DEEPEN_RELATIVE)) {
 218                 opts->deepen_relative = !!value;
 219                 return 0;
 220         } else if (!strcmp(name, TRANS_OPT_FROM_PROMISOR)) {
 221                 opts->from_promisor = !!value;
 222                 return 0;
 223         } else if (!strcmp(name, TRANS_OPT_NO_DEPENDENTS)) {
 224                 opts->no_dependents = !!value;
 225                 return 0;
 226         } else if (!strcmp(name, TRANS_OPT_LIST_OBJECTS_FILTER)) {
 227                 parse_list_objects_filter(&opts->filter_options, value);
 228                 return 0;
 229         }
 230         return 1;
 231 }
 232
 233 static int connect_setup(struct transport *transport, int for_push)
 234 {
 235         struct git_transport_data *data = transport->data;
 236         int flags = transport->verbose > 0 ? CONNECT_VERBOSE : 0;
 237
 238         if (data->conn)
 239                 return 0;
 240
 241         switch (transport->family) {
 242         case TRANSPORT_FAMILY_ALL: break;
 243         case TRANSPORT_FAMILY_IPV4: flags |= CONNECT_IPV4; break;
 244         case TRANSPORT_FAMILY_IPV6: flags |= CONNECT_IPV6; break;
 245         }
 246
 247         data->conn = git_connect(data->fd, transport->url,
 248                                  for_push ? data->options.receivepack :
 249                                  data->options.uploadpack,
 250                                  flags);
 251
 252         return 0;
 253 }
 254
 255 static struct ref *get_refs_via_connect(struct transport *transport, int for_push,
 256                                         const struct argv_array *ref_prefixes)
 257 {
 258         struct git_transport_data *data = transport->data;
 259         struct ref *refs = NULL;
 260         struct packet_reader reader;
 261
 262         connect_setup(transport, for_push);
 263
 264         packet_reader_init(&reader, data->fd[0], NULL, 0,
 265                            PACKET_READ_CHOMP_NEWLINE |
 266                            PACKET_READ_GENTLE_ON_EOF);
 267
 268         data->version = discover_version(&reader);
 269         switch (data->version) {
 270         case protocol_v2:
 271                 get_remote_refs(data->fd[1], &reader, &refs, for_push,
 272                                 ref_prefixes, transport->server_options);
 273                 break;
 274         case protocol_v1:
 275         case protocol_v0:
 276                 get_remote_heads(&reader, &refs,
 277                                  for_push ? REF_NORMAL : 0,
 278                                  &data->extra_have,
 279                                  &data->shallow);
 280                 break;
 281         case protocol_unknown_version:
 282                 BUG("unknown protocol version");
 283         }
 284         data->got_remote_heads = 1;
 285
 286         return refs;
 287 }
 288
 289 static int fetch_refs_via_pack(struct transport *transport,
 290                                int nr_heads, struct ref **to_fetch)
 291 {
 292         int ret = 0;
 293         struct git_transport_data *data = transport->data;
 294         struct ref *refs = NULL;
 295         char *dest = xstrdup(transport->url);
 296         struct fetch_pack_args args;
 297         struct ref *refs_tmp = NULL;
 298
 299         memset(&args, 0, sizeof(args));
 300         args.uploadpack = data->options.uploadpack;
 301         args.keep_pack = data->options.keep;
 302         args.lock_pack = 1;
 303         args.use_thin_pack = data->options.thin;
 304         args.include_tag = data->options.followtags;
 305         args.verbose = (transport->verbose > 1);
 306         args.quiet = (transport->verbose < 0);
 307         args.no_progress = !transport->progress;
 308         args.depth = data->options.depth;
 309         args.deepen_since = data->options.deepen_since;
 310         args.deepen_not = data->options.deepen_not;
 311         args.deepen_relative = data->options.deepen_relative;
 312         args.check_self_contained_and_connected =
 313                 data->options.check_self_contained_and_connected;
 314         args.cloning = transport->cloning;
 315         args.update_shallow = data->options.update_shallow;
 316         args.from_promisor = data->options.from_promisor;
 317         args.no_dependents = data->options.no_dependents;
 318         args.filter_options = data->options.filter_options;
 319         args.stateless_rpc = transport->stateless_rpc;
 320         args.server_options = transport->server_options;
 321
 322         if (!data->got_remote_heads)
 323                 refs_tmp = get_refs_via_connect(transport, 0, NULL);
 324
 325         switch (data->version) {
 326         case protocol_v2:
 327                 refs = fetch_pack(&args, data->fd, data->conn,
 328                                   refs_tmp ? refs_tmp : transport->remote_refs,
 329                                   dest, to_fetch, nr_heads, &data->shallow,
 330                                   &transport->pack_lockfile, data->version);
 331                 break;
 332         case protocol_v1:
 333         case protocol_v0:
 334                 refs = fetch_pack(&args, data->fd, data->conn,
 335                                   refs_tmp ? refs_tmp : transport->remote_refs,
 336                                   dest, to_fetch, nr_heads, &data->shallow,
 337                                   &transport->pack_lockfile, data->version);
 338                 break;
 339         case protocol_unknown_version:
 340                 BUG("unknown protocol version");
 341         }
 342
 343         close(data->fd[0]);
 344         close(data->fd[1]);
 345         if (finish_connect(data->conn))
 346                 ret = -1;
 347         data->conn = NULL;
 348         data->got_remote_heads = 0;
 349         data->options.self_contained_and_connected =
 350                 args.self_contained_and_connected;
 351
 352         if (refs == NULL)
 353                 ret = -1;
 354         if (report_unmatched_refs(to_fetch, nr_heads))
 355                 ret = -1;
 356
 357         free_refs(refs_tmp);
 358         free_refs(refs);
 359         free(dest);
 360         return ret;
 361 }
 362
 363 static int push_had_errors(struct ref *ref)
 364 {
 365         for (; ref; ref = ref->next) {
 366                 switch (ref->status) {
 367                 case REF_STATUS_NONE:
 368                 case REF_STATUS_UPTODATE:
 369                 case REF_STATUS_OK:
 370                         break;
 371                 default:
 372                         return 1;
 373                 }
 374         }
 375         return 0;
 376 }
 377
 378 int transport_refs_pushed(struct ref *ref)
 379 {
 380         for (; ref; ref = ref->next) {
 381                 switch(ref->status) {
 382                 case REF_STATUS_NONE:
 383                 case REF_STATUS_UPTODATE:
 384                         break;
 385                 default:
 386                         return 1;
 387                 }
 388         }
 389         return 0;
 390 }
 391
 392 void transport_update_tracking_ref(struct remote *remote, struct ref *ref, int verbose)
 393 {
 394         struct refspec_item rs;
 395
 396         if (ref->status != REF_STATUS_OK && ref->status != REF_STATUS_UPTODATE)
 397                 return;
 398
 399         rs.src = ref->name;
 400         rs.dst = NULL;
 401
 402         if (!remote_find_tracking(remote, &rs)) {
 403                 if (verbose)
 404                         fprintf(stderr, "updating local tracking ref '%s'\n", rs.dst);
 405                 if (ref->deletion) {
 406                         delete_ref(NULL, rs.dst, NULL, 0);
 407                 } else
 408                         update_ref("update by push", rs.dst, &ref->new_oid,
 409                                    NULL, 0, 0);
 410                 free(rs.dst);
 411         }
 412 }
 413
 414 static void print_ref_status(char flag, const char *summary,
 415                              struct ref *to, struct ref *from, const char *msg,
 416                              int porcelain, int summary_width)
 417 {
 418         if (porcelain) {
 419                 if (from)
 420                         fprintf(stdout, "%c\t%s:%s\t", flag, from->name, to->name);
 421                 else
 422                         fprintf(stdout, "%c\t:%s\t", flag, to->name);
 423                 if (msg)
 424                         fprintf(stdout, "%s (%s)\n", summary, msg);
 425                 else
 426                         fprintf(stdout, "%s\n", summary);
 427         } else {
 428                 const char *red = "", *reset = "";
 429                 if (push_had_errors(to)) {
 430                         red = transport_get_color(TRANSPORT_COLOR_REJECTED);
 431                         reset = transport_get_color(TRANSPORT_COLOR_RESET);
 432                 }
 433                 fprintf(stderr, " %s%c %-*s%s ", red, flag, summary_width,
 434                         summary, reset);
 435                 if (from)
 436                         fprintf(stderr, "%s -> %s", prettify_refname(from->name), prettify_refname(to->name));
 437                 else
 438                         fputs(prettify_refname(to->name), stderr);
 439                 if (msg) {
 440                         fputs(" (", stderr);
 441                         fputs(msg, stderr);
 442                         fputc(')', stderr);
 443                 }
 444                 fputc('\n', stderr);
 445         }
 446 }
 447
 448 static void print_ok_ref_status(struct ref *ref, int porcelain, int summary_width)
 449 {
 450         if (ref->deletion)
 451                 print_ref_status('-', "[deleted]", ref, NULL, NULL,
 452                                  porcelain, summary_width);
 453         else if (is_null_oid(&ref->old_oid))
 454                 print_ref_status('*',
 455                         (starts_with(ref->name, "refs/tags/") ? "[new tag]" :
 456                         "[new branch]"),
 457                         ref, ref->peer_ref, NULL, porcelain, summary_width);
 458         else {
 459                 struct strbuf quickref = STRBUF_INIT;
 460                 char type;
 461                 const char *msg;
 462
 463                 strbuf_add_unique_abbrev(&quickref, &ref->old_oid,
 464                                          DEFAULT_ABBREV);
 465                 if (ref->forced_update) {
 466                         strbuf_addstr(&quickref, "...");
 467                         type = '+';
 468                         msg = "forced update";
 469                 } else {
 470                         strbuf_addstr(&quickref, "..");
 471                         type = ' ';
 472                         msg = NULL;
 473                 }
 474                 strbuf_add_unique_abbrev(&quickref, &ref->new_oid,
 475                                          DEFAULT_ABBREV);
 476
 477                 print_ref_status(type, quickref.buf, ref, ref->peer_ref, msg,
 478                                  porcelain, summary_width);
 479                 strbuf_release(&quickref);
 480         }
 481 }
 482
 483 static int print_one_push_status(struct ref *ref, const char *dest, int count,
 484                                  int porcelain, int summary_width)
 485 {
 486         if (!count) {
 487                 char *url = transport_anonymize_url(dest);
 488                 fprintf(porcelain ? stdout : stderr, "To %s\n", url);
 489                 free(url);
 490         }
 491
 492         switch(ref->status) {
 493         case REF_STATUS_NONE:
 494                 print_ref_status('X', "[no match]", ref, NULL, NULL,
 495                                  porcelain, summary_width);
 496                 break;
 497         case REF_STATUS_REJECT_NODELETE:
 498                 print_ref_status('!', "[rejected]", ref, NULL,
 499                                  "remote does not support deleting refs",
 500                                  porcelain, summary_width);
 501                 break;
 502         case REF_STATUS_UPTODATE:
 503                 print_ref_status('=', "[up to date]", ref,
 504                                  ref->peer_ref, NULL, porcelain, summary_width);
 505                 break;
 506         case REF_STATUS_REJECT_NONFASTFORWARD:
 507                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 508                                  "non-fast-forward", porcelain, summary_width);
 509                 break;
 510         case REF_STATUS_REJECT_ALREADY_EXISTS:
 511                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 512                                  "already exists", porcelain, summary_width);
 513                 break;
 514         case REF_STATUS_REJECT_FETCH_FIRST:
 515                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 516                                  "fetch first", porcelain, summary_width);
 517                 break;
 518         case REF_STATUS_REJECT_NEEDS_FORCE:
 519                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 520                                  "needs force", porcelain, summary_width);
 521                 break;
 522         case REF_STATUS_REJECT_STALE:
 523                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 524                                  "stale info", porcelain, summary_width);
 525                 break;
 526         case REF_STATUS_REJECT_SHALLOW:
 527                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 528                                  "new shallow roots not allowed",
 529                                  porcelain, summary_width);
 530                 break;
 531         case REF_STATUS_REMOTE_REJECT:
 532                 print_ref_status('!', "[remote rejected]", ref,
 533                                  ref->deletion ? NULL : ref->peer_ref,
 534                                  ref->remote_status, porcelain, summary_width);
 535                 break;
 536         case REF_STATUS_EXPECTING_REPORT:
 537                 print_ref_status('!', "[remote failure]", ref,
 538                                  ref->deletion ? NULL : ref->peer_ref,
 539                                  "remote failed to report status",
 540                                  porcelain, summary_width);
 541                 break;
 542         case REF_STATUS_ATOMIC_PUSH_FAILED:
 543                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 544                                  "atomic push failed", porcelain, summary_width);
 545                 break;
 546         case REF_STATUS_OK:
 547                 print_ok_ref_status(ref, porcelain, summary_width);
 548                 break;
 549         }
 550
 551         return 1;
 552 }
 553
 554 static int measure_abbrev(const struct object_id *oid, int sofar)
 555 {
 556         char hex[GIT_MAX_HEXSZ + 1];
 557         int w = find_unique_abbrev_r(hex, oid, DEFAULT_ABBREV);
 558
 559         return (w < sofar) ? sofar : w;
 560 }
 561
 562 int transport_summary_width(const struct ref *refs)
 563 {
 564         int maxw = -1;
 565
 566         for (; refs; refs = refs->next) {
 567                 maxw = measure_abbrev(&refs->old_oid, maxw);
 568                 maxw = measure_abbrev(&refs->new_oid, maxw);
 569         }
 570         if (maxw < 0)
 571                 maxw = FALLBACK_DEFAULT_ABBREV;
 572         return (2 * maxw + 3);
 573 }
 574
 575 void transport_print_push_status(const char *dest, struct ref *refs,
 576                                   int verbose, int porcelain, unsigned int *reject_reasons)
 577 {
 578         struct ref *ref;
 579         int n = 0;
 580         char *head;
 581         int summary_width = transport_summary_width(refs);
 582
 583         if (transport_color_config() < 0)
 584                 warning(_("could not parse transport.color.* config"));
 585
 586         head = resolve_refdup("HEAD", RESOLVE_REF_READING, NULL, NULL);
 587
 588         if (verbose) {
 589                 for (ref = refs; ref; ref = ref->next)
 590                         if (ref->status == REF_STATUS_UPTODATE)
 591                                 n += print_one_push_status(ref, dest, n,
 592                                                            porcelain, summary_width);
 593         }
 594
 595         for (ref = refs; ref; ref = ref->next)
 596                 if (ref->status == REF_STATUS_OK)
 597                         n += print_one_push_status(ref, dest, n,
 598                                                    porcelain, summary_width);
 599
 600         *reject_reasons = 0;
 601         for (ref = refs; ref; ref = ref->next) {
 602                 if (ref->status != REF_STATUS_NONE &&
 603                     ref->status != REF_STATUS_UPTODATE &&
 604                     ref->status != REF_STATUS_OK)
 605                         n += print_one_push_status(ref, dest, n,
 606                                                    porcelain, summary_width);
 607                 if (ref->status == REF_STATUS_REJECT_NONFASTFORWARD) {
 608                         if (head != NULL && !strcmp(head, ref->name))
 609                                 *reject_reasons |= REJECT_NON_FF_HEAD;
 610                         else
 611                                 *reject_reasons |= REJECT_NON_FF_OTHER;
 612                 } else if (ref->status == REF_STATUS_REJECT_ALREADY_EXISTS) {
 613                         *reject_reasons |= REJECT_ALREADY_EXISTS;
 614                 } else if (ref->status == REF_STATUS_REJECT_FETCH_FIRST) {
 615                         *reject_reasons |= REJECT_FETCH_FIRST;
 616                 } else if (ref->status == REF_STATUS_REJECT_NEEDS_FORCE) {
 617                         *reject_reasons |= REJECT_NEEDS_FORCE;
 618                 }
 619         }
 620         free(head);
 621 }
 622
 623 static int git_transport_push(struct transport *transport, struct ref *remote_refs, int flags)
 624 {
 625         struct git_transport_data *data = transport->data;
 626         struct send_pack_args args;
 627         int ret = 0;
 628
 629         if (transport_color_config() < 0)
 630                 return -1;
 631
 632         if (!data->got_remote_heads)
 633                 get_refs_via_connect(transport, 1, NULL);
 634
 635         memset(&args, 0, sizeof(args));
 636         args.send_mirror = !!(flags & TRANSPORT_PUSH_MIRROR);
 637         args.force_update = !!(flags & TRANSPORT_PUSH_FORCE);
 638         args.use_thin_pack = data->options.thin;
 639         args.verbose = (transport->verbose > 0);
 640         args.quiet = (transport->verbose < 0);
 641         args.progress = transport->progress;
 642         args.dry_run = !!(flags & TRANSPORT_PUSH_DRY_RUN);
 643         args.porcelain = !!(flags & TRANSPORT_PUSH_PORCELAIN);
 644         args.atomic = !!(flags & TRANSPORT_PUSH_ATOMIC);
 645         args.push_options = transport->push_options;
 646         args.url = transport->url;
 647
 648         if (flags & TRANSPORT_PUSH_CERT_ALWAYS)
 649                 args.push_cert = SEND_PACK_PUSH_CERT_ALWAYS;
 650         else if (flags & TRANSPORT_PUSH_CERT_IF_ASKED)
 651                 args.push_cert = SEND_PACK_PUSH_CERT_IF_ASKED;
 652         else
 653                 args.push_cert = SEND_PACK_PUSH_CERT_NEVER;
 654
 655         switch (data->version) {
 656         case protocol_v2:
 657                 die("support for protocol v2 not implemented yet");
 658                 break;
 659         case protocol_v1:
 660         case protocol_v0:
 661                 ret = send_pack(&args, data->fd, data->conn, remote_refs,
 662                                 &data->extra_have);
 663                 break;
 664         case protocol_unknown_version:
 665                 BUG("unknown protocol version");
 666         }
 667
 668         close(data->fd[1]);
 669         close(data->fd[0]);
 670         ret |= finish_connect(data->conn);
 671         data->conn = NULL;
 672         data->got_remote_heads = 0;
 673
 674         return ret;
 675 }
 676
 677 static int connect_git(struct transport *transport, const char *name,
 678                        const char *executable, int fd[2])
 679 {
 680         struct git_transport_data *data = transport->data;
 681         data->conn = git_connect(data->fd, transport->url,
 682                                  executable, 0);
 683         fd[0] = data->fd[0];
 684         fd[1] = data->fd[1];
 685         return 0;
 686 }
 687
 688 static int disconnect_git(struct transport *transport)
 689 {
 690         struct git_transport_data *data = transport->data;
 691         if (data->conn) {
 692                 if (data->got_remote_heads)
 693                         packet_flush(data->fd[1]);
 694                 close(data->fd[0]);
 695                 close(data->fd[1]);
 696                 finish_connect(data->conn);
 697         }
 698
 699         free(data);
 700         return 0;
 701 }
 702
 703 static struct transport_vtable taken_over_vtable = {
 704         NULL,
 705         get_refs_via_connect,
 706         fetch_refs_via_pack,
 707         git_transport_push,
 708         NULL,
 709         disconnect_git
 710 };
 711
 712 void transport_take_over(struct transport *transport,
 713                          struct child_process *child)
 714 {
 715         struct git_transport_data *data;
 716
 717         if (!transport->smart_options)
 718                 BUG("taking over transport requires non-NULL "
 719                     "smart_options field.");
 720
 721         data = xcalloc(1, sizeof(*data));
 722         data->options = *transport->smart_options;
 723         data->conn = child;
 724         data->fd[0] = data->conn->out;
 725         data->fd[1] = data->conn->in;
 726         data->got_remote_heads = 0;
 727         transport->data = data;
 728
 729         transport->vtable = &taken_over_vtable;
 730         transport->smart_options = &(data->options);
 731
 732         transport->cannot_reuse = 1;
 733 }
 734
 735 static int is_file(const char *url)
 736 {
 737         struct stat buf;
 738         if (stat(url, &buf))
 739                 return 0;
 740         return S_ISREG(buf.st_mode);
 741 }
 742
 743 static int external_specification_len(const char *url)
 744 {
 745         return strchr(url, ':') - url;
 746 }
 747
 748 static const struct string_list *protocol_whitelist(void)
 749 {
 750         static int enabled = -1;
 751         static struct string_list allowed = STRING_LIST_INIT_DUP;
 752
 753         if (enabled < 0) {
 754                 const char *v = getenv("GIT_ALLOW_PROTOCOL");
 755                 if (v) {
 756                         string_list_split(&allowed, v, ':', -1);
 757                         string_list_sort(&allowed);
 758                         enabled = 1;
 759                 } else {
 760                         enabled = 0;
 761                 }
 762         }
 763
 764         return enabled ? &allowed : NULL;
 765 }
 766
 767 enum protocol_allow_config {
 768         PROTOCOL_ALLOW_NEVER = 0,
 769         PROTOCOL_ALLOW_USER_ONLY,
 770         PROTOCOL_ALLOW_ALWAYS
 771 };
 772
 773 static enum protocol_allow_config parse_protocol_config(const char *key,
 774                                                         const char *value)
 775 {
 776         if (!strcasecmp(value, "always"))
 777                 return PROTOCOL_ALLOW_ALWAYS;
 778         else if (!strcasecmp(value, "never"))
 779                 return PROTOCOL_ALLOW_NEVER;
 780         else if (!strcasecmp(value, "user"))
 781                 return PROTOCOL_ALLOW_USER_ONLY;
 782
 783         die("unknown value for config '%s': %s", key, value);
 784 }
 785
 786 static enum protocol_allow_config get_protocol_config(const char *type)
 787 {
 788         char *key = xstrfmt("protocol.%s.allow", type);
 789         char *value;
 790
 791         /* first check the per-protocol config */
 792         if (!git_config_get_string(key, &value)) {
 793                 enum protocol_allow_config ret =
 794                         parse_protocol_config(key, value);
 795                 free(key);
 796                 free(value);
 797                 return ret;
 798         }
 799         free(key);
 800
 801         /* if defined, fallback to user-defined default for unknown protocols */
 802         if (!git_config_get_string("protocol.allow", &value)) {
 803                 enum protocol_allow_config ret =
 804                         parse_protocol_config("protocol.allow", value);
 805                 free(value);
 806                 return ret;
 807         }
 808
 809         /* fallback to built-in defaults */
 810         /* known safe */
 811         if (!strcmp(type, "http") ||
 812             !strcmp(type, "https") ||
 813             !strcmp(type, "git") ||
 814             !strcmp(type, "ssh") ||
 815             !strcmp(type, "file"))
 816                 return PROTOCOL_ALLOW_ALWAYS;
 817
 818         /* known scary; err on the side of caution */
 819         if (!strcmp(type, "ext"))
 820                 return PROTOCOL_ALLOW_NEVER;
 821
 822         /* unknown; by default let them be used only directly by the user */
 823         return PROTOCOL_ALLOW_USER_ONLY;
 824 }
 825
 826 int is_transport_allowed(const char *type, int from_user)
 827 {
 828         const struct string_list *whitelist = protocol_whitelist();
 829         if (whitelist)
 830                 return string_list_has_string(whitelist, type);
 831
 832         switch (get_protocol_config(type)) {
 833         case PROTOCOL_ALLOW_ALWAYS:
 834                 return 1;
 835         case PROTOCOL_ALLOW_NEVER:
 836                 return 0;
 837         case PROTOCOL_ALLOW_USER_ONLY:
 838                 if (from_user < 0)
 839                         from_user = git_env_bool("GIT_PROTOCOL_FROM_USER", 1);
 840                 return from_user;
 841         }
 842
 843         BUG("invalid protocol_allow_config type");
 844 }
 845
 846 void transport_check_allowed(const char *type)
 847 {
 848         if (!is_transport_allowed(type, -1))
 849                 die("transport '%s' not allowed", type);
 850 }
 851
 852 static struct transport_vtable bundle_vtable = {
 853         NULL,
 854         get_refs_from_bundle,
 855         fetch_refs_from_bundle,
 856         NULL,
 857         NULL,
 858         close_bundle
 859 };
 860
 861 static struct transport_vtable builtin_smart_vtable = {
 862         NULL,
 863         get_refs_via_connect,
 864         fetch_refs_via_pack,
 865         git_transport_push,
 866         connect_git,
 867         disconnect_git
 868 };
 869
 870 struct transport *transport_get(struct remote *remote, const char *url)
 871 {
 872         const char *helper;
 873         struct transport *ret = xcalloc(1, sizeof(*ret));
 874
 875         ret->progress = isatty(2);
 876
 877         if (!remote)
 878                 die("No remote provided to transport_get()");
 879
 880         ret->got_remote_refs = 0;
 881         ret->remote = remote;
 882         helper = remote->foreign_vcs;
 883
 884         if (!url && remote->url)
 885                 url = remote->url[0];
 886         ret->url = url;
 887
 888         /* maybe it is a foreign URL? */
 889         if (url) {
 890                 const char *p = url;
 891
 892                 while (is_urlschemechar(p == url, *p))
 893                         p++;
 894                 if (starts_with(p, "::"))
 895                         helper = xstrndup(url, p - url);
 896         }
 897
 898         if (helper) {
 899                 transport_helper_init(ret, helper);
 900         } else if (starts_with(url, "rsync:")) {
 901                 die("git-over-rsync is no longer supported");
 902         } else if (url_is_local_not_ssh(url) && is_file(url) && is_bundle(url, 1)) {
 903                 struct bundle_transport_data *data = xcalloc(1, sizeof(*data));
 904                 transport_check_allowed("file");
 905                 ret->data = data;
 906                 ret->vtable = &bundle_vtable;
 907                 ret->smart_options = NULL;
 908         } else if (!is_url(url)
 909                 || starts_with(url, "file://")
 910                 || starts_with(url, "git://")
 911                 || starts_with(url, "ssh://")
 912                 || starts_with(url, "git+ssh://") /* deprecated - do not use */
 913                 || starts_with(url, "ssh+git://") /* deprecated - do not use */
 914                 ) {
 915                 /*
 916                  * These are builtin smart transports; "allowed" transports
 917                  * will be checked individually in git_connect.
 918                  */
 919                 struct git_transport_data *data = xcalloc(1, sizeof(*data));
 920                 ret->data = data;
 921                 ret->vtable = &builtin_smart_vtable;
 922                 ret->smart_options = &(data->options);
 923
 924                 data->conn = NULL;
 925                 data->got_remote_heads = 0;
 926         } else {
 927                 /* Unknown protocol in URL. Pass to external handler. */
 928                 int len = external_specification_len(url);
 929                 char *handler = xmemdupz(url, len);
 930                 transport_helper_init(ret, handler);
 931         }
 932
 933         if (ret->smart_options) {
 934                 ret->smart_options->thin = 1;
 935                 ret->smart_options->uploadpack = "git-upload-pack";
 936                 if (remote->uploadpack)
 937                         ret->smart_options->uploadpack = remote->uploadpack;
 938                 ret->smart_options->receivepack = "git-receive-pack";
 939                 if (remote->receivepack)
 940                         ret->smart_options->receivepack = remote->receivepack;
 941         }
 942
 943         return ret;
 944 }
 945
 946 int transport_set_option(struct transport *transport,
 947                          const char *name, const char *value)
 948 {
 949         int git_reports = 1, protocol_reports = 1;
 950
 951         if (transport->smart_options)
 952                 git_reports = set_git_option(transport->smart_options,
 953                                              name, value);
 954
 955         if (transport->vtable->set_option)
 956                 protocol_reports = transport->vtable->set_option(transport,
 957                                                                  name, value);
 958
 959         /* If either report is 0, report 0 (success). */
 960         if (!git_reports || !protocol_reports)
 961                 return 0;
 962         /* If either reports -1 (invalid value), report -1. */
 963         if ((git_reports == -1) || (protocol_reports == -1))
 964                 return -1;
 965         /* Otherwise if both report unknown, report unknown. */
 966         return 1;
 967 }
 968
 969 void transport_set_verbosity(struct transport *transport, int verbosity,
 970         int force_progress)
 971 {
 972         if (verbosity >= 1)
 973                 transport->verbose = verbosity <= 3 ? verbosity : 3;
 974         if (verbosity < 0)
 975                 transport->verbose = -1;
 976
 977         /**
 978          * Rules used to determine whether to report progress (processing aborts
 979          * when a rule is satisfied):
 980          *
 981          *   . Report progress, if force_progress is 1 (ie. --progress).
 982          *   . Don't report progress, if force_progress is 0 (ie. --no-progress).
 983          *   . Don't report progress, if verbosity < 0 (ie. -q/--quiet ).
 984          *   . Report progress if isatty(2) is 1.
 985          **/
 986         if (force_progress >= 0)
 987                 transport->progress = !!force_progress;
 988         else
 989                 transport->progress = verbosity >= 0 && isatty(2);
 990 }
 991
 992 static void die_with_unpushed_submodules(struct string_list *needs_pushing)
 993 {
 994         int i;
 995
 996         fprintf(stderr, _("The following submodule paths contain changes that can\n"
 997                         "not be found on any remote:\n"));
 998         for (i = 0; i < needs_pushing->nr; i++)
 999                 fprintf(stderr, "  %s\n", needs_pushing->items[i].string);
1000         fprintf(stderr, _("\nPlease try\n\n"
1001                           "     git push --recurse-submodules=on-demand\n\n"
1002                           "or cd to the path and use\n\n"
1003                           "     git push\n\n"
1004                           "to push them to a remote.\n\n"));
1005
1006         string_list_clear(needs_pushing, 0);
1007
1008         die(_("Aborting."));
1009 }
1010
1011 static int run_pre_push_hook(struct transport *transport,
1012                              struct ref *remote_refs)
1013 {
1014         int ret = 0, x;
1015         struct ref *r;
1016         struct child_process proc = CHILD_PROCESS_INIT;
1017         struct strbuf buf;
1018         const char *argv[4];
1019
1020         if (!(argv[0] = find_hook("pre-push")))
1021                 return 0;
1022
1023         argv[1] = transport->remote->name;
1024         argv[2] = transport->url;
1025         argv[3] = NULL;
1026
1027         proc.argv = argv;
1028         proc.in = -1;
1029
1030         if (start_command(&proc)) {
1031                 finish_command(&proc);
1032                 return -1;
1033         }
1034
1035         sigchain_push(SIGPIPE, SIG_IGN);
1036
1037         strbuf_init(&buf, 256);
1038
1039         for (r = remote_refs; r; r = r->next) {
1040                 if (!r->peer_ref) continue;
1041                 if (r->status == REF_STATUS_REJECT_NONFASTFORWARD) continue;
1042                 if (r->status == REF_STATUS_REJECT_STALE) continue;
1043                 if (r->status == REF_STATUS_UPTODATE) continue;
1044
1045                 strbuf_reset(&buf);
1046                 strbuf_addf( &buf, "%s %s %s %s\n",
1047                          r->peer_ref->name, oid_to_hex(&r->new_oid),
1048                          r->name, oid_to_hex(&r->old_oid));
1049
1050                 if (write_in_full(proc.in, buf.buf, buf.len) < 0) {
1051                         /* We do not mind if a hook does not read all refs. */
1052                         if (errno != EPIPE)
1053                                 ret = -1;
1054                         break;
1055                 }
1056         }
1057
1058         strbuf_release(&buf);
1059
1060         x = close(proc.in);
1061         if (!ret)
1062                 ret = x;
1063
1064         sigchain_pop(SIGPIPE);
1065
1066         x = finish_command(&proc);
1067         if (!ret)
1068                 ret = x;
1069
1070         return ret;
1071 }
1072
1073 int transport_push(struct transport *transport,
1074                    struct refspec *rs, int flags,
1075                    unsigned int *reject_reasons)
1076 {
1077         *reject_reasons = 0;
1078
1079         if (transport_color_config() < 0)
1080                 return -1;
1081
1082         if (transport->vtable->push_refs) {
1083                 struct ref *remote_refs;
1084                 struct ref *local_refs = get_local_heads();
1085                 int match_flags = MATCH_REFS_NONE;
1086                 int verbose = (transport->verbose > 0);
1087                 int quiet = (transport->verbose < 0);
1088                 int porcelain = flags & TRANSPORT_PUSH_PORCELAIN;
1089                 int pretend = flags & TRANSPORT_PUSH_DRY_RUN;
1090                 int push_ret, ret, err;
1091                 struct argv_array ref_prefixes = ARGV_ARRAY_INIT;
1092
1093                 if (check_push_refs(local_refs, rs) < 0)
1094                         return -1;
1095
1096                 refspec_ref_prefixes(rs, &ref_prefixes);
1097
1098                 remote_refs = transport->vtable->get_refs_list(transport, 1,
1099                                                                &ref_prefixes);
1100
1101                 argv_array_clear(&ref_prefixes);
1102
1103                 if (flags & TRANSPORT_PUSH_ALL)
1104                         match_flags |= MATCH_REFS_ALL;
1105                 if (flags & TRANSPORT_PUSH_MIRROR)
1106                         match_flags |= MATCH_REFS_MIRROR;
1107                 if (flags & TRANSPORT_PUSH_PRUNE)
1108                         match_flags |= MATCH_REFS_PRUNE;
1109                 if (flags & TRANSPORT_PUSH_FOLLOW_TAGS)
1110                         match_flags |= MATCH_REFS_FOLLOW_TAGS;
1111
1112                 if (match_push_refs(local_refs, &remote_refs, rs, match_flags))
1113                         return -1;
1114
1115                 if (transport->smart_options &&
1116                     transport->smart_options->cas &&
1117                     !is_empty_cas(transport->smart_options->cas))
1118                         apply_push_cas(transport->smart_options->cas,
1119                                        transport->remote, remote_refs);
1120
1121                 set_ref_status_for_push(remote_refs,
1122                         flags & TRANSPORT_PUSH_MIRROR,
1123                         flags & TRANSPORT_PUSH_FORCE);
1124
1125                 if (!(flags & TRANSPORT_PUSH_NO_HOOK))
1126                         if (run_pre_push_hook(transport, remote_refs))
1127                                 return -1;
1128
1129                 if ((flags & (TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND |
1130                               TRANSPORT_RECURSE_SUBMODULES_ONLY)) &&
1131                     !is_bare_repository()) {
1132                         struct ref *ref = remote_refs;
1133                         struct oid_array commits = OID_ARRAY_INIT;
1134
1135                         for (; ref; ref = ref->next)
1136                                 if (!is_null_oid(&ref->new_oid))
1137                                         oid_array_append(&commits,
1138                                                           &ref->new_oid);
1139
1140                         if (!push_unpushed_submodules(&commits,
1141                                                       transport->remote,
1142                                                       rs,
1143                                                       transport->push_options,
1144                                                       pretend)) {
1145                                 oid_array_clear(&commits);
1146                                 die("Failed to push all needed submodules!");
1147                         }
1148                         oid_array_clear(&commits);
1149                 }
1150
1151                 if (((flags & TRANSPORT_RECURSE_SUBMODULES_CHECK) ||
1152                      ((flags & (TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND |
1153                                 TRANSPORT_RECURSE_SUBMODULES_ONLY)) &&
1154                       !pretend)) && !is_bare_repository()) {
1155                         struct ref *ref = remote_refs;
1156                         struct string_list needs_pushing = STRING_LIST_INIT_DUP;
1157                         struct oid_array commits = OID_ARRAY_INIT;
1158
1159                         for (; ref; ref = ref->next)
1160                                 if (!is_null_oid(&ref->new_oid))
1161                                         oid_array_append(&commits,
1162                                                           &ref->new_oid);
1163
1164                         if (find_unpushed_submodules(&commits, transport->remote->name,
1165                                                 &needs_pushing)) {
1166                                 oid_array_clear(&commits);
1167                                 die_with_unpushed_submodules(&needs_pushing);
1168                         }
1169                         string_list_clear(&needs_pushing, 0);
1170                         oid_array_clear(&commits);
1171                 }
1172
1173                 if (!(flags & TRANSPORT_RECURSE_SUBMODULES_ONLY))
1174                         push_ret = transport->vtable->push_refs(transport, remote_refs, flags);
1175                 else
1176                         push_ret = 0;
1177                 err = push_had_errors(remote_refs);
1178                 ret = push_ret | err;
1179
1180                 if (!quiet || err)
1181                         transport_print_push_status(transport->url, remote_refs,
1182                                         verbose | porcelain, porcelain,
1183                                         reject_reasons);
1184
1185                 if (flags & TRANSPORT_PUSH_SET_UPSTREAM)
1186                         set_upstreams(transport, remote_refs, pretend);
1187
1188                 if (!(flags & (TRANSPORT_PUSH_DRY_RUN |
1189                                TRANSPORT_RECURSE_SUBMODULES_ONLY))) {
1190                         struct ref *ref;
1191                         for (ref = remote_refs; ref; ref = ref->next)
1192                                 transport_update_tracking_ref(transport->remote, ref, verbose);
1193                 }
1194
1195                 if (porcelain && !push_ret)
1196                         puts("Done");
1197                 else if (!quiet && !ret && !transport_refs_pushed(remote_refs))
1198                         fprintf(stderr, "Everything up-to-date\n");
1199
1200                 return ret;
1201         }
1202         return 1;
1203 }
1204
1205 const struct ref *transport_get_remote_refs(struct transport *transport,
1206                                             const struct argv_array *ref_prefixes)
1207 {
1208         if (!transport->got_remote_refs) {
1209                 transport->remote_refs =
1210                         transport->vtable->get_refs_list(transport, 0,
1211                                                          ref_prefixes);
1212                 transport->got_remote_refs = 1;
1213         }
1214
1215         return transport->remote_refs;
1216 }
1217
1218 int transport_fetch_refs(struct transport *transport, struct ref *refs)
1219 {
1220         int rc;
1221         int nr_heads = 0, nr_alloc = 0, nr_refs = 0;
1222         struct ref **heads = NULL;
1223         struct ref *rm;
1224
1225         for (rm = refs; rm; rm = rm->next) {
1226                 nr_refs++;
1227                 if (rm->peer_ref &&
1228                     !is_null_oid(&rm->old_oid) &&
1229                     !oidcmp(&rm->peer_ref->old_oid, &rm->old_oid))
1230                         continue;
1231                 ALLOC_GROW(heads, nr_heads + 1, nr_alloc);
1232                 heads[nr_heads++] = rm;
1233         }
1234
1235         if (!nr_heads) {
1236                 /*
1237                  * When deepening of a shallow repository is requested,
1238                  * then local and remote refs are likely to still be equal.
1239                  * Just feed them all to the fetch method in that case.
1240                  * This condition shouldn't be met in a non-deepening fetch
1241                  * (see builtin/fetch.c:quickfetch()).
1242                  */
1243                 ALLOC_ARRAY(heads, nr_refs);
1244                 for (rm = refs; rm; rm = rm->next)
1245                         heads[nr_heads++] = rm;
1246         }
1247
1248         rc = transport->vtable->fetch(transport, nr_heads, heads);
1249
1250         free(heads);
1251         return rc;
1252 }
1253
1254 void transport_unlock_pack(struct transport *transport)
1255 {
1256         if (transport->pack_lockfile) {
1257                 unlink_or_warn(transport->pack_lockfile);
1258                 FREE_AND_NULL(transport->pack_lockfile);
1259         }
1260 }
1261
1262 int transport_connect(struct transport *transport, const char *name,
1263                       const char *exec, int fd[2])
1264 {
1265         if (transport->vtable->connect)
1266                 return transport->vtable->connect(transport, name, exec, fd);
1267         else
1268                 die("Operation not supported by protocol");
1269 }
1270
1271 int transport_disconnect(struct transport *transport)
1272 {
1273         int ret = 0;
1274         if (transport->vtable->disconnect)
1275                 ret = transport->vtable->disconnect(transport);
1276         free(transport);
1277         return ret;
1278 }
1279
1280 /*
1281  * Strip username (and password) from a URL and return
1282  * it in a newly allocated string.
1283  */
1284 char *transport_anonymize_url(const char *url)
1285 {
1286         char *scheme_prefix, *anon_part;
1287         size_t anon_len, prefix_len = 0;
1288
1289         anon_part = strchr(url, '@');
1290         if (url_is_local_not_ssh(url) || !anon_part)
1291                 goto literal_copy;
1292
1293         anon_len = strlen(++anon_part);
1294         scheme_prefix = strstr(url, "://");
1295         if (!scheme_prefix) {
1296                 if (!strchr(anon_part, ':'))
1297                         /* cannot be "me@there:/path/name" */
1298                         goto literal_copy;
1299         } else {
1300                 const char *cp;
1301                 /* make sure scheme is reasonable */
1302                 for (cp = url; cp < scheme_prefix; cp++) {
1303                         switch (*cp) {
1304                                 /* RFC 1738 2.1 */
1305                         case '+': case '.': case '-':
1306                                 break; /* ok */
1307                         default:
1308                                 if (isalnum(*cp))
1309                                         break;
1310                                 /* it isn't */
1311                                 goto literal_copy;
1312                         }
1313                 }
1314                 /* @ past the first slash does not count */
1315                 cp = strchr(scheme_prefix + 3, '/');
1316                 if (cp && cp < anon_part)
1317                         goto literal_copy;
1318                 prefix_len = scheme_prefix - url + 3;
1319         }
1320         return xstrfmt("%.*s%.*s", (int)prefix_len, url,
1321                        (int)anon_len, anon_part);
1322 literal_copy:
1323         return xstrdup(url);
1324 }
1325
1326 static void read_alternate_refs(const char *path,
1327                                 alternate_ref_fn *cb,
1328                                 void *data)
1329 {
1330         struct child_process cmd = CHILD_PROCESS_INIT;
1331         struct strbuf line = STRBUF_INIT;
1332         FILE *fh;
1333
1334         cmd.git_cmd = 1;
1335         argv_array_pushf(&cmd.args, "--git-dir=%s", path);
1336         argv_array_push(&cmd.args, "for-each-ref");
1337         argv_array_push(&cmd.args, "--format=%(objectname) %(refname)");
1338         cmd.env = local_repo_env;
1339         cmd.out = -1;
1340
1341         if (start_command(&cmd))
1342                 return;
1343
1344         fh = xfdopen(cmd.out, "r");
1345         while (strbuf_getline_lf(&line, fh) != EOF) {
1346                 struct object_id oid;
1347
1348                 if (get_oid_hex(line.buf, &oid) ||
1349                     line.buf[GIT_SHA1_HEXSZ] != ' ') {
1350                         warning("invalid line while parsing alternate refs: %s",
1351                                 line.buf);
1352                         break;
1353                 }
1354
1355                 cb(line.buf + GIT_SHA1_HEXSZ + 1, &oid, data);
1356         }
1357
1358         fclose(fh);
1359         finish_command(&cmd);
1360 }
1361
1362 struct alternate_refs_data {
1363         alternate_ref_fn *fn;
1364         void *data;
1365 };
1366
1367 static int refs_from_alternate_cb(struct alternate_object_database *e,
1368                                   void *data)
1369 {
1370         struct strbuf path = STRBUF_INIT;
1371         size_t base_len;
1372         struct alternate_refs_data *cb = data;
1373
1374         if (!strbuf_realpath(&path, e->path, 0))
1375                 goto out;
1376         if (!strbuf_strip_suffix(&path, "/objects"))
1377                 goto out;
1378         base_len = path.len;
1379
1380         /* Is this a git repository with refs? */
1381         strbuf_addstr(&path, "/refs");
1382         if (!is_directory(path.buf))
1383                 goto out;
1384         strbuf_setlen(&path, base_len);
1385
1386         read_alternate_refs(path.buf, cb->fn, cb->data);
1387
1388 out:
1389         strbuf_release(&path);
1390         return 0;
1391 }
1392
1393 void for_each_alternate_ref(alternate_ref_fn fn, void *data)
1394 {
1395         struct alternate_refs_data cb;
1396         cb.fn = fn;
1397         cb.data = data;
1398         foreach_alt_odb(refs_from_alternate_cb, &cb);
1399 }