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(the_repository, &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 /*
 256  * Obtains the protocol version from the transport and writes it to
 257  * transport->data->version, first connecting if not already connected.
 258  *
 259  * If the protocol version is one that allows skipping the listing of remote
 260  * refs, and must_list_refs is 0, the listing of remote refs is skipped and
 261  * this function returns NULL. Otherwise, this function returns the list of
 262  * remote refs.
 263  */
 264 static struct ref *handshake(struct transport *transport, int for_push,
 265                              const struct argv_array *ref_prefixes,
 266                              int must_list_refs)
 267 {
 268         struct git_transport_data *data = transport->data;
 269         struct ref *refs = NULL;
 270         struct packet_reader reader;
 271
 272         connect_setup(transport, for_push);
 273
 274         packet_reader_init(&reader, data->fd[0], NULL, 0,
 275                            PACKET_READ_CHOMP_NEWLINE |
 276                            PACKET_READ_GENTLE_ON_EOF |
 277                            PACKET_READ_DIE_ON_ERR_PACKET);
 278
 279         data->version = discover_version(&reader);
 280         switch (data->version) {
 281         case protocol_v2:
 282                 if (must_list_refs)
 283                         get_remote_refs(data->fd[1], &reader, &refs, for_push,
 284                                         ref_prefixes,
 285                                         transport->server_options);
 286                 break;
 287         case protocol_v1:
 288         case protocol_v0:
 289                 get_remote_heads(&reader, &refs,
 290                                  for_push ? REF_NORMAL : 0,
 291                                  &data->extra_have,
 292                                  &data->shallow);
 293                 break;
 294         case protocol_unknown_version:
 295                 BUG("unknown protocol version");
 296         }
 297         data->got_remote_heads = 1;
 298
 299         if (reader.line_peeked)
 300                 BUG("buffer must be empty at the end of handshake()");
 301
 302         return refs;
 303 }
 304
 305 static struct ref *get_refs_via_connect(struct transport *transport, int for_push,
 306                                         const struct argv_array *ref_prefixes)
 307 {
 308         return handshake(transport, for_push, ref_prefixes, 1);
 309 }
 310
 311 static int fetch_refs_via_pack(struct transport *transport,
 312                                int nr_heads, struct ref **to_fetch)
 313 {
 314         int ret = 0;
 315         struct git_transport_data *data = transport->data;
 316         struct ref *refs = NULL;
 317         char *dest = xstrdup(transport->url);
 318         struct fetch_pack_args args;
 319         struct ref *refs_tmp = NULL;
 320
 321         memset(&args, 0, sizeof(args));
 322         args.uploadpack = data->options.uploadpack;
 323         args.keep_pack = data->options.keep;
 324         args.lock_pack = 1;
 325         args.use_thin_pack = data->options.thin;
 326         args.include_tag = data->options.followtags;
 327         args.verbose = (transport->verbose > 1);
 328         args.quiet = (transport->verbose < 0);
 329         args.no_progress = !transport->progress;
 330         args.depth = data->options.depth;
 331         args.deepen_since = data->options.deepen_since;
 332         args.deepen_not = data->options.deepen_not;
 333         args.deepen_relative = data->options.deepen_relative;
 334         args.check_self_contained_and_connected =
 335                 data->options.check_self_contained_and_connected;
 336         args.cloning = transport->cloning;
 337         args.update_shallow = data->options.update_shallow;
 338         args.from_promisor = data->options.from_promisor;
 339         args.no_dependents = data->options.no_dependents;
 340         args.filter_options = data->options.filter_options;
 341         args.stateless_rpc = transport->stateless_rpc;
 342         args.server_options = transport->server_options;
 343         args.negotiation_tips = data->options.negotiation_tips;
 344
 345         if (!data->got_remote_heads) {
 346                 int i;
 347                 int must_list_refs = 0;
 348                 for (i = 0; i < nr_heads; i++) {
 349                         if (!to_fetch[i]->exact_oid) {
 350                                 must_list_refs = 1;
 351                                 break;
 352                         }
 353                 }
 354                 refs_tmp = handshake(transport, 0, NULL, must_list_refs);
 355         }
 356
 357         switch (data->version) {
 358         case protocol_v2:
 359                 refs = fetch_pack(&args, data->fd, data->conn,
 360                                   refs_tmp ? refs_tmp : transport->remote_refs,
 361                                   dest, to_fetch, nr_heads, &data->shallow,
 362                                   &transport->pack_lockfile, data->version);
 363                 break;
 364         case protocol_v1:
 365         case protocol_v0:
 366                 refs = fetch_pack(&args, data->fd, data->conn,
 367                                   refs_tmp ? refs_tmp : transport->remote_refs,
 368                                   dest, to_fetch, nr_heads, &data->shallow,
 369                                   &transport->pack_lockfile, data->version);
 370                 break;
 371         case protocol_unknown_version:
 372                 BUG("unknown protocol version");
 373         }
 374
 375         close(data->fd[0]);
 376         close(data->fd[1]);
 377         if (finish_connect(data->conn))
 378                 ret = -1;
 379         data->conn = NULL;
 380         data->got_remote_heads = 0;
 381         data->options.self_contained_and_connected =
 382                 args.self_contained_and_connected;
 383         data->options.connectivity_checked = args.connectivity_checked;
 384
 385         if (refs == NULL)
 386                 ret = -1;
 387         if (report_unmatched_refs(to_fetch, nr_heads))
 388                 ret = -1;
 389
 390         free_refs(refs_tmp);
 391         free_refs(refs);
 392         free(dest);
 393         return ret;
 394 }
 395
 396 static int push_had_errors(struct ref *ref)
 397 {
 398         for (; ref; ref = ref->next) {
 399                 switch (ref->status) {
 400                 case REF_STATUS_NONE:
 401                 case REF_STATUS_UPTODATE:
 402                 case REF_STATUS_OK:
 403                         break;
 404                 default:
 405                         return 1;
 406                 }
 407         }
 408         return 0;
 409 }
 410
 411 int transport_refs_pushed(struct ref *ref)
 412 {
 413         for (; ref; ref = ref->next) {
 414                 switch(ref->status) {
 415                 case REF_STATUS_NONE:
 416                 case REF_STATUS_UPTODATE:
 417                         break;
 418                 default:
 419                         return 1;
 420                 }
 421         }
 422         return 0;
 423 }
 424
 425 void transport_update_tracking_ref(struct remote *remote, struct ref *ref, int verbose)
 426 {
 427         struct refspec_item rs;
 428
 429         if (ref->status != REF_STATUS_OK && ref->status != REF_STATUS_UPTODATE)
 430                 return;
 431
 432         rs.src = ref->name;
 433         rs.dst = NULL;
 434
 435         if (!remote_find_tracking(remote, &rs)) {
 436                 if (verbose)
 437                         fprintf(stderr, "updating local tracking ref '%s'\n", rs.dst);
 438                 if (ref->deletion) {
 439                         delete_ref(NULL, rs.dst, NULL, 0);
 440                 } else
 441                         update_ref("update by push", rs.dst, &ref->new_oid,
 442                                    NULL, 0, 0);
 443                 free(rs.dst);
 444         }
 445 }
 446
 447 static void print_ref_status(char flag, const char *summary,
 448                              struct ref *to, struct ref *from, const char *msg,
 449                              int porcelain, int summary_width)
 450 {
 451         if (porcelain) {
 452                 if (from)
 453                         fprintf(stdout, "%c\t%s:%s\t", flag, from->name, to->name);
 454                 else
 455                         fprintf(stdout, "%c\t:%s\t", flag, to->name);
 456                 if (msg)
 457                         fprintf(stdout, "%s (%s)\n", summary, msg);
 458                 else
 459                         fprintf(stdout, "%s\n", summary);
 460         } else {
 461                 const char *red = "", *reset = "";
 462                 if (push_had_errors(to)) {
 463                         red = transport_get_color(TRANSPORT_COLOR_REJECTED);
 464                         reset = transport_get_color(TRANSPORT_COLOR_RESET);
 465                 }
 466                 fprintf(stderr, " %s%c %-*s%s ", red, flag, summary_width,
 467                         summary, reset);
 468                 if (from)
 469                         fprintf(stderr, "%s -> %s", prettify_refname(from->name), prettify_refname(to->name));
 470                 else
 471                         fputs(prettify_refname(to->name), stderr);
 472                 if (msg) {
 473                         fputs(" (", stderr);
 474                         fputs(msg, stderr);
 475                         fputc(')', stderr);
 476                 }
 477                 fputc('\n', stderr);
 478         }
 479 }
 480
 481 static void print_ok_ref_status(struct ref *ref, int porcelain, int summary_width)
 482 {
 483         if (ref->deletion)
 484                 print_ref_status('-', "[deleted]", ref, NULL, NULL,
 485                                  porcelain, summary_width);
 486         else if (is_null_oid(&ref->old_oid))
 487                 print_ref_status('*',
 488                         (starts_with(ref->name, "refs/tags/") ? "[new tag]" :
 489                         "[new branch]"),
 490                         ref, ref->peer_ref, NULL, porcelain, summary_width);
 491         else {
 492                 struct strbuf quickref = STRBUF_INIT;
 493                 char type;
 494                 const char *msg;
 495
 496                 strbuf_add_unique_abbrev(&quickref, &ref->old_oid,
 497                                          DEFAULT_ABBREV);
 498                 if (ref->forced_update) {
 499                         strbuf_addstr(&quickref, "...");
 500                         type = '+';
 501                         msg = "forced update";
 502                 } else {
 503                         strbuf_addstr(&quickref, "..");
 504                         type = ' ';
 505                         msg = NULL;
 506                 }
 507                 strbuf_add_unique_abbrev(&quickref, &ref->new_oid,
 508                                          DEFAULT_ABBREV);
 509
 510                 print_ref_status(type, quickref.buf, ref, ref->peer_ref, msg,
 511                                  porcelain, summary_width);
 512                 strbuf_release(&quickref);
 513         }
 514 }
 515
 516 static int print_one_push_status(struct ref *ref, const char *dest, int count,
 517                                  int porcelain, int summary_width)
 518 {
 519         if (!count) {
 520                 char *url = transport_anonymize_url(dest);
 521                 fprintf(porcelain ? stdout : stderr, "To %s\n", url);
 522                 free(url);
 523         }
 524
 525         switch(ref->status) {
 526         case REF_STATUS_NONE:
 527                 print_ref_status('X', "[no match]", ref, NULL, NULL,
 528                                  porcelain, summary_width);
 529                 break;
 530         case REF_STATUS_REJECT_NODELETE:
 531                 print_ref_status('!', "[rejected]", ref, NULL,
 532                                  "remote does not support deleting refs",
 533                                  porcelain, summary_width);
 534                 break;
 535         case REF_STATUS_UPTODATE:
 536                 print_ref_status('=', "[up to date]", ref,
 537                                  ref->peer_ref, NULL, porcelain, summary_width);
 538                 break;
 539         case REF_STATUS_REJECT_NONFASTFORWARD:
 540                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 541                                  "non-fast-forward", porcelain, summary_width);
 542                 break;
 543         case REF_STATUS_REJECT_ALREADY_EXISTS:
 544                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 545                                  "already exists", porcelain, summary_width);
 546                 break;
 547         case REF_STATUS_REJECT_FETCH_FIRST:
 548                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 549                                  "fetch first", porcelain, summary_width);
 550                 break;
 551         case REF_STATUS_REJECT_NEEDS_FORCE:
 552                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 553                                  "needs force", porcelain, summary_width);
 554                 break;
 555         case REF_STATUS_REJECT_STALE:
 556                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 557                                  "stale info", porcelain, summary_width);
 558                 break;
 559         case REF_STATUS_REJECT_SHALLOW:
 560                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 561                                  "new shallow roots not allowed",
 562                                  porcelain, summary_width);
 563                 break;
 564         case REF_STATUS_REMOTE_REJECT:
 565                 print_ref_status('!', "[remote rejected]", ref,
 566                                  ref->deletion ? NULL : ref->peer_ref,
 567                                  ref->remote_status, porcelain, summary_width);
 568                 break;
 569         case REF_STATUS_EXPECTING_REPORT:
 570                 print_ref_status('!', "[remote failure]", ref,
 571                                  ref->deletion ? NULL : ref->peer_ref,
 572                                  "remote failed to report status",
 573                                  porcelain, summary_width);
 574                 break;
 575         case REF_STATUS_ATOMIC_PUSH_FAILED:
 576                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 577                                  "atomic push failed", porcelain, summary_width);
 578                 break;
 579         case REF_STATUS_OK:
 580                 print_ok_ref_status(ref, porcelain, summary_width);
 581                 break;
 582         }
 583
 584         return 1;
 585 }
 586
 587 static int measure_abbrev(const struct object_id *oid, int sofar)
 588 {
 589         char hex[GIT_MAX_HEXSZ + 1];
 590         int w = find_unique_abbrev_r(hex, oid, DEFAULT_ABBREV);
 591
 592         return (w < sofar) ? sofar : w;
 593 }
 594
 595 int transport_summary_width(const struct ref *refs)
 596 {
 597         int maxw = -1;
 598
 599         for (; refs; refs = refs->next) {
 600                 maxw = measure_abbrev(&refs->old_oid, maxw);
 601                 maxw = measure_abbrev(&refs->new_oid, maxw);
 602         }
 603         if (maxw < 0)
 604                 maxw = FALLBACK_DEFAULT_ABBREV;
 605         return (2 * maxw + 3);
 606 }
 607
 608 void transport_print_push_status(const char *dest, struct ref *refs,
 609                                   int verbose, int porcelain, unsigned int *reject_reasons)
 610 {
 611         struct ref *ref;
 612         int n = 0;
 613         char *head;
 614         int summary_width = transport_summary_width(refs);
 615
 616         if (transport_color_config() < 0)
 617                 warning(_("could not parse transport.color.* config"));
 618
 619         head = resolve_refdup("HEAD", RESOLVE_REF_READING, NULL, NULL);
 620
 621         if (verbose) {
 622                 for (ref = refs; ref; ref = ref->next)
 623                         if (ref->status == REF_STATUS_UPTODATE)
 624                                 n += print_one_push_status(ref, dest, n,
 625                                                            porcelain, summary_width);
 626         }
 627
 628         for (ref = refs; ref; ref = ref->next)
 629                 if (ref->status == REF_STATUS_OK)
 630                         n += print_one_push_status(ref, dest, n,
 631                                                    porcelain, summary_width);
 632
 633         *reject_reasons = 0;
 634         for (ref = refs; ref; ref = ref->next) {
 635                 if (ref->status != REF_STATUS_NONE &&
 636                     ref->status != REF_STATUS_UPTODATE &&
 637                     ref->status != REF_STATUS_OK)
 638                         n += print_one_push_status(ref, dest, n,
 639                                                    porcelain, summary_width);
 640                 if (ref->status == REF_STATUS_REJECT_NONFASTFORWARD) {
 641                         if (head != NULL && !strcmp(head, ref->name))
 642                                 *reject_reasons |= REJECT_NON_FF_HEAD;
 643                         else
 644                                 *reject_reasons |= REJECT_NON_FF_OTHER;
 645                 } else if (ref->status == REF_STATUS_REJECT_ALREADY_EXISTS) {
 646                         *reject_reasons |= REJECT_ALREADY_EXISTS;
 647                 } else if (ref->status == REF_STATUS_REJECT_FETCH_FIRST) {
 648                         *reject_reasons |= REJECT_FETCH_FIRST;
 649                 } else if (ref->status == REF_STATUS_REJECT_NEEDS_FORCE) {
 650                         *reject_reasons |= REJECT_NEEDS_FORCE;
 651                 }
 652         }
 653         free(head);
 654 }
 655
 656 static int git_transport_push(struct transport *transport, struct ref *remote_refs, int flags)
 657 {
 658         struct git_transport_data *data = transport->data;
 659         struct send_pack_args args;
 660         int ret = 0;
 661
 662         if (transport_color_config() < 0)
 663                 return -1;
 664
 665         if (!data->got_remote_heads)
 666                 get_refs_via_connect(transport, 1, NULL);
 667
 668         memset(&args, 0, sizeof(args));
 669         args.send_mirror = !!(flags & TRANSPORT_PUSH_MIRROR);
 670         args.force_update = !!(flags & TRANSPORT_PUSH_FORCE);
 671         args.use_thin_pack = data->options.thin;
 672         args.verbose = (transport->verbose > 0);
 673         args.quiet = (transport->verbose < 0);
 674         args.progress = transport->progress;
 675         args.dry_run = !!(flags & TRANSPORT_PUSH_DRY_RUN);
 676         args.porcelain = !!(flags & TRANSPORT_PUSH_PORCELAIN);
 677         args.atomic = !!(flags & TRANSPORT_PUSH_ATOMIC);
 678         args.push_options = transport->push_options;
 679         args.url = transport->url;
 680
 681         if (flags & TRANSPORT_PUSH_CERT_ALWAYS)
 682                 args.push_cert = SEND_PACK_PUSH_CERT_ALWAYS;
 683         else if (flags & TRANSPORT_PUSH_CERT_IF_ASKED)
 684                 args.push_cert = SEND_PACK_PUSH_CERT_IF_ASKED;
 685         else
 686                 args.push_cert = SEND_PACK_PUSH_CERT_NEVER;
 687
 688         switch (data->version) {
 689         case protocol_v2:
 690                 die(_("support for protocol v2 not implemented yet"));
 691                 break;
 692         case protocol_v1:
 693         case protocol_v0:
 694                 ret = send_pack(&args, data->fd, data->conn, remote_refs,
 695                                 &data->extra_have);
 696                 break;
 697         case protocol_unknown_version:
 698                 BUG("unknown protocol version");
 699         }
 700
 701         close(data->fd[1]);
 702         close(data->fd[0]);
 703         ret |= finish_connect(data->conn);
 704         data->conn = NULL;
 705         data->got_remote_heads = 0;
 706
 707         return ret;
 708 }
 709
 710 static int connect_git(struct transport *transport, const char *name,
 711                        const char *executable, int fd[2])
 712 {
 713         struct git_transport_data *data = transport->data;
 714         data->conn = git_connect(data->fd, transport->url,
 715                                  executable, 0);
 716         fd[0] = data->fd[0];
 717         fd[1] = data->fd[1];
 718         return 0;
 719 }
 720
 721 static int disconnect_git(struct transport *transport)
 722 {
 723         struct git_transport_data *data = transport->data;
 724         if (data->conn) {
 725                 if (data->got_remote_heads)
 726                         packet_flush(data->fd[1]);
 727                 close(data->fd[0]);
 728                 close(data->fd[1]);
 729                 finish_connect(data->conn);
 730         }
 731
 732         free(data);
 733         return 0;
 734 }
 735
 736 static struct transport_vtable taken_over_vtable = {
 737         1,
 738         NULL,
 739         get_refs_via_connect,
 740         fetch_refs_via_pack,
 741         git_transport_push,
 742         NULL,
 743         disconnect_git
 744 };
 745
 746 void transport_take_over(struct transport *transport,
 747                          struct child_process *child)
 748 {
 749         struct git_transport_data *data;
 750
 751         if (!transport->smart_options)
 752                 BUG("taking over transport requires non-NULL "
 753                     "smart_options field.");
 754
 755         data = xcalloc(1, sizeof(*data));
 756         data->options = *transport->smart_options;
 757         data->conn = child;
 758         data->fd[0] = data->conn->out;
 759         data->fd[1] = data->conn->in;
 760         data->got_remote_heads = 0;
 761         transport->data = data;
 762
 763         transport->vtable = &taken_over_vtable;
 764         transport->smart_options = &(data->options);
 765
 766         transport->cannot_reuse = 1;
 767 }
 768
 769 static int is_file(const char *url)
 770 {
 771         struct stat buf;
 772         if (stat(url, &buf))
 773                 return 0;
 774         return S_ISREG(buf.st_mode);
 775 }
 776
 777 static int external_specification_len(const char *url)
 778 {
 779         return strchr(url, ':') - url;
 780 }
 781
 782 static const struct string_list *protocol_whitelist(void)
 783 {
 784         static int enabled = -1;
 785         static struct string_list allowed = STRING_LIST_INIT_DUP;
 786
 787         if (enabled < 0) {
 788                 const char *v = getenv("GIT_ALLOW_PROTOCOL");
 789                 if (v) {
 790                         string_list_split(&allowed, v, ':', -1);
 791                         string_list_sort(&allowed);
 792                         enabled = 1;
 793                 } else {
 794                         enabled = 0;
 795                 }
 796         }
 797
 798         return enabled ? &allowed : NULL;
 799 }
 800
 801 enum protocol_allow_config {
 802         PROTOCOL_ALLOW_NEVER = 0,
 803         PROTOCOL_ALLOW_USER_ONLY,
 804         PROTOCOL_ALLOW_ALWAYS
 805 };
 806
 807 static enum protocol_allow_config parse_protocol_config(const char *key,
 808                                                         const char *value)
 809 {
 810         if (!strcasecmp(value, "always"))
 811                 return PROTOCOL_ALLOW_ALWAYS;
 812         else if (!strcasecmp(value, "never"))
 813                 return PROTOCOL_ALLOW_NEVER;
 814         else if (!strcasecmp(value, "user"))
 815                 return PROTOCOL_ALLOW_USER_ONLY;
 816
 817         die(_("unknown value for config '%s': %s"), key, value);
 818 }
 819
 820 static enum protocol_allow_config get_protocol_config(const char *type)
 821 {
 822         char *key = xstrfmt("protocol.%s.allow", type);
 823         char *value;
 824
 825         /* first check the per-protocol config */
 826         if (!git_config_get_string(key, &value)) {
 827                 enum protocol_allow_config ret =
 828                         parse_protocol_config(key, value);
 829                 free(key);
 830                 free(value);
 831                 return ret;
 832         }
 833         free(key);
 834
 835         /* if defined, fallback to user-defined default for unknown protocols */
 836         if (!git_config_get_string("protocol.allow", &value)) {
 837                 enum protocol_allow_config ret =
 838                         parse_protocol_config("protocol.allow", value);
 839                 free(value);
 840                 return ret;
 841         }
 842
 843         /* fallback to built-in defaults */
 844         /* known safe */
 845         if (!strcmp(type, "http") ||
 846             !strcmp(type, "https") ||
 847             !strcmp(type, "git") ||
 848             !strcmp(type, "ssh") ||
 849             !strcmp(type, "file"))
 850                 return PROTOCOL_ALLOW_ALWAYS;
 851
 852         /* known scary; err on the side of caution */
 853         if (!strcmp(type, "ext"))
 854                 return PROTOCOL_ALLOW_NEVER;
 855
 856         /* unknown; by default let them be used only directly by the user */
 857         return PROTOCOL_ALLOW_USER_ONLY;
 858 }
 859
 860 int is_transport_allowed(const char *type, int from_user)
 861 {
 862         const struct string_list *whitelist = protocol_whitelist();
 863         if (whitelist)
 864                 return string_list_has_string(whitelist, type);
 865
 866         switch (get_protocol_config(type)) {
 867         case PROTOCOL_ALLOW_ALWAYS:
 868                 return 1;
 869         case PROTOCOL_ALLOW_NEVER:
 870                 return 0;
 871         case PROTOCOL_ALLOW_USER_ONLY:
 872                 if (from_user < 0)
 873                         from_user = git_env_bool("GIT_PROTOCOL_FROM_USER", 1);
 874                 return from_user;
 875         }
 876
 877         BUG("invalid protocol_allow_config type");
 878 }
 879
 880 void transport_check_allowed(const char *type)
 881 {
 882         if (!is_transport_allowed(type, -1))
 883                 die(_("transport '%s' not allowed"), type);
 884 }
 885
 886 static struct transport_vtable bundle_vtable = {
 887         0,
 888         NULL,
 889         get_refs_from_bundle,
 890         fetch_refs_from_bundle,
 891         NULL,
 892         NULL,
 893         close_bundle
 894 };
 895
 896 static struct transport_vtable builtin_smart_vtable = {
 897         1,
 898         NULL,
 899         get_refs_via_connect,
 900         fetch_refs_via_pack,
 901         git_transport_push,
 902         connect_git,
 903         disconnect_git
 904 };
 905
 906 struct transport *transport_get(struct remote *remote, const char *url)
 907 {
 908         const char *helper;
 909         struct transport *ret = xcalloc(1, sizeof(*ret));
 910
 911         ret->progress = isatty(2);
 912
 913         if (!remote)
 914                 BUG("No remote provided to transport_get()");
 915
 916         ret->got_remote_refs = 0;
 917         ret->remote = remote;
 918         helper = remote->foreign_vcs;
 919
 920         if (!url && remote->url)
 921                 url = remote->url[0];
 922         ret->url = url;
 923
 924         /* maybe it is a foreign URL? */
 925         if (url) {
 926                 const char *p = url;
 927
 928                 while (is_urlschemechar(p == url, *p))
 929                         p++;
 930                 if (starts_with(p, "::"))
 931                         helper = xstrndup(url, p - url);
 932         }
 933
 934         if (helper) {
 935                 transport_helper_init(ret, helper);
 936         } else if (starts_with(url, "rsync:")) {
 937                 die(_("git-over-rsync is no longer supported"));
 938         } else if (url_is_local_not_ssh(url) && is_file(url) && is_bundle(url, 1)) {
 939                 struct bundle_transport_data *data = xcalloc(1, sizeof(*data));
 940                 transport_check_allowed("file");
 941                 ret->data = data;
 942                 ret->vtable = &bundle_vtable;
 943                 ret->smart_options = NULL;
 944         } else if (!is_url(url)
 945                 || starts_with(url, "file://")
 946                 || starts_with(url, "git://")
 947                 || starts_with(url, "ssh://")
 948                 || starts_with(url, "git+ssh://") /* deprecated - do not use */
 949                 || starts_with(url, "ssh+git://") /* deprecated - do not use */
 950                 ) {
 951                 /*
 952                  * These are builtin smart transports; "allowed" transports
 953                  * will be checked individually in git_connect.
 954                  */
 955                 struct git_transport_data *data = xcalloc(1, sizeof(*data));
 956                 ret->data = data;
 957                 ret->vtable = &builtin_smart_vtable;
 958                 ret->smart_options = &(data->options);
 959
 960                 data->conn = NULL;
 961                 data->got_remote_heads = 0;
 962         } else {
 963                 /* Unknown protocol in URL. Pass to external handler. */
 964                 int len = external_specification_len(url);
 965                 char *handler = xmemdupz(url, len);
 966                 transport_helper_init(ret, handler);
 967         }
 968
 969         if (ret->smart_options) {
 970                 ret->smart_options->thin = 1;
 971                 ret->smart_options->uploadpack = "git-upload-pack";
 972                 if (remote->uploadpack)
 973                         ret->smart_options->uploadpack = remote->uploadpack;
 974                 ret->smart_options->receivepack = "git-receive-pack";
 975                 if (remote->receivepack)
 976                         ret->smart_options->receivepack = remote->receivepack;
 977         }
 978
 979         return ret;
 980 }
 981
 982 int transport_set_option(struct transport *transport,
 983                          const char *name, const char *value)
 984 {
 985         int git_reports = 1, protocol_reports = 1;
 986
 987         if (transport->smart_options)
 988                 git_reports = set_git_option(transport->smart_options,
 989                                              name, value);
 990
 991         if (transport->vtable->set_option)
 992                 protocol_reports = transport->vtable->set_option(transport,
 993                                                                  name, value);
 994
 995         /* If either report is 0, report 0 (success). */
 996         if (!git_reports || !protocol_reports)
 997                 return 0;
 998         /* If either reports -1 (invalid value), report -1. */
 999         if ((git_reports == -1) || (protocol_reports == -1))
1000                 return -1;
1001         /* Otherwise if both report unknown, report unknown. */
1002         return 1;
1003 }
1004
1005 void transport_set_verbosity(struct transport *transport, int verbosity,
1006         int force_progress)
1007 {
1008         if (verbosity >= 1)
1009                 transport->verbose = verbosity <= 3 ? verbosity : 3;
1010         if (verbosity < 0)
1011                 transport->verbose = -1;
1012
1013         /**
1014          * Rules used to determine whether to report progress (processing aborts
1015          * when a rule is satisfied):
1016          *
1017          *   . Report progress, if force_progress is 1 (ie. --progress).
1018          *   . Don't report progress, if force_progress is 0 (ie. --no-progress).
1019          *   . Don't report progress, if verbosity < 0 (ie. -q/--quiet ).
1020          *   . Report progress if isatty(2) is 1.
1021          **/
1022         if (force_progress >= 0)
1023                 transport->progress = !!force_progress;
1024         else
1025                 transport->progress = verbosity >= 0 && isatty(2);
1026 }
1027
1028 static void die_with_unpushed_submodules(struct string_list *needs_pushing)
1029 {
1030         int i;
1031
1032         fprintf(stderr, _("The following submodule paths contain changes that can\n"
1033                         "not be found on any remote:\n"));
1034         for (i = 0; i < needs_pushing->nr; i++)
1035                 fprintf(stderr, "  %s\n", needs_pushing->items[i].string);
1036         fprintf(stderr, _("\nPlease try\n\n"
1037                           "     git push --recurse-submodules=on-demand\n\n"
1038                           "or cd to the path and use\n\n"
1039                           "     git push\n\n"
1040                           "to push them to a remote.\n\n"));
1041
1042         string_list_clear(needs_pushing, 0);
1043
1044         die(_("Aborting."));
1045 }
1046
1047 static int run_pre_push_hook(struct transport *transport,
1048                              struct ref *remote_refs)
1049 {
1050         int ret = 0, x;
1051         struct ref *r;
1052         struct child_process proc = CHILD_PROCESS_INIT;
1053         struct strbuf buf;
1054         const char *argv[4];
1055
1056         if (!(argv[0] = find_hook("pre-push")))
1057                 return 0;
1058
1059         argv[1] = transport->remote->name;
1060         argv[2] = transport->url;
1061         argv[3] = NULL;
1062
1063         proc.argv = argv;
1064         proc.in = -1;
1065
1066         if (start_command(&proc)) {
1067                 finish_command(&proc);
1068                 return -1;
1069         }
1070
1071         sigchain_push(SIGPIPE, SIG_IGN);
1072
1073         strbuf_init(&buf, 256);
1074
1075         for (r = remote_refs; r; r = r->next) {
1076                 if (!r->peer_ref) continue;
1077                 if (r->status == REF_STATUS_REJECT_NONFASTFORWARD) continue;
1078                 if (r->status == REF_STATUS_REJECT_STALE) continue;
1079                 if (r->status == REF_STATUS_UPTODATE) continue;
1080
1081                 strbuf_reset(&buf);
1082                 strbuf_addf( &buf, "%s %s %s %s\n",
1083                          r->peer_ref->name, oid_to_hex(&r->new_oid),
1084                          r->name, oid_to_hex(&r->old_oid));
1085
1086                 if (write_in_full(proc.in, buf.buf, buf.len) < 0) {
1087                         /* We do not mind if a hook does not read all refs. */
1088                         if (errno != EPIPE)
1089                                 ret = -1;
1090                         break;
1091                 }
1092         }
1093
1094         strbuf_release(&buf);
1095
1096         x = close(proc.in);
1097         if (!ret)
1098                 ret = x;
1099
1100         sigchain_pop(SIGPIPE);
1101
1102         x = finish_command(&proc);
1103         if (!ret)
1104                 ret = x;
1105
1106         return ret;
1107 }
1108
1109 int transport_push(struct repository *r,
1110                    struct transport *transport,
1111                    struct refspec *rs, int flags,
1112                    unsigned int *reject_reasons)
1113 {
1114         *reject_reasons = 0;
1115
1116         if (transport_color_config() < 0)
1117                 return -1;
1118
1119         if (transport->vtable->push_refs) {
1120                 struct ref *remote_refs;
1121                 struct ref *local_refs = get_local_heads();
1122                 int match_flags = MATCH_REFS_NONE;
1123                 int verbose = (transport->verbose > 0);
1124                 int quiet = (transport->verbose < 0);
1125                 int porcelain = flags & TRANSPORT_PUSH_PORCELAIN;
1126                 int pretend = flags & TRANSPORT_PUSH_DRY_RUN;
1127                 int push_ret, ret, err;
1128                 struct argv_array ref_prefixes = ARGV_ARRAY_INIT;
1129
1130                 if (check_push_refs(local_refs, rs) < 0)
1131                         return -1;
1132
1133                 refspec_ref_prefixes(rs, &ref_prefixes);
1134
1135                 remote_refs = transport->vtable->get_refs_list(transport, 1,
1136                                                                &ref_prefixes);
1137
1138                 argv_array_clear(&ref_prefixes);
1139
1140                 if (flags & TRANSPORT_PUSH_ALL)
1141                         match_flags |= MATCH_REFS_ALL;
1142                 if (flags & TRANSPORT_PUSH_MIRROR)
1143                         match_flags |= MATCH_REFS_MIRROR;
1144                 if (flags & TRANSPORT_PUSH_PRUNE)
1145                         match_flags |= MATCH_REFS_PRUNE;
1146                 if (flags & TRANSPORT_PUSH_FOLLOW_TAGS)
1147                         match_flags |= MATCH_REFS_FOLLOW_TAGS;
1148
1149                 if (match_push_refs(local_refs, &remote_refs, rs, match_flags))
1150                         return -1;
1151
1152                 if (transport->smart_options &&
1153                     transport->smart_options->cas &&
1154                     !is_empty_cas(transport->smart_options->cas))
1155                         apply_push_cas(transport->smart_options->cas,
1156                                        transport->remote, remote_refs);
1157
1158                 set_ref_status_for_push(remote_refs,
1159                         flags & TRANSPORT_PUSH_MIRROR,
1160                         flags & TRANSPORT_PUSH_FORCE);
1161
1162                 if (!(flags & TRANSPORT_PUSH_NO_HOOK))
1163                         if (run_pre_push_hook(transport, remote_refs))
1164                                 return -1;
1165
1166                 if ((flags & (TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND |
1167                               TRANSPORT_RECURSE_SUBMODULES_ONLY)) &&
1168                     !is_bare_repository()) {
1169                         struct ref *ref = remote_refs;
1170                         struct oid_array commits = OID_ARRAY_INIT;
1171
1172                         for (; ref; ref = ref->next)
1173                                 if (!is_null_oid(&ref->new_oid))
1174                                         oid_array_append(&commits,
1175                                                           &ref->new_oid);
1176
1177                         if (!push_unpushed_submodules(r,
1178                                                       &commits,
1179                                                       transport->remote,
1180                                                       rs,
1181                                                       transport->push_options,
1182                                                       pretend)) {
1183                                 oid_array_clear(&commits);
1184                                 die(_("failed to push all needed submodules"));
1185                         }
1186                         oid_array_clear(&commits);
1187                 }
1188
1189                 if (((flags & TRANSPORT_RECURSE_SUBMODULES_CHECK) ||
1190                      ((flags & (TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND |
1191                                 TRANSPORT_RECURSE_SUBMODULES_ONLY)) &&
1192                       !pretend)) && !is_bare_repository()) {
1193                         struct ref *ref = remote_refs;
1194                         struct string_list needs_pushing = STRING_LIST_INIT_DUP;
1195                         struct oid_array commits = OID_ARRAY_INIT;
1196
1197                         for (; ref; ref = ref->next)
1198                                 if (!is_null_oid(&ref->new_oid))
1199                                         oid_array_append(&commits,
1200                                                           &ref->new_oid);
1201
1202                         if (find_unpushed_submodules(r,
1203                                                      &commits,
1204                                                      transport->remote->name,
1205                                                      &needs_pushing)) {
1206                                 oid_array_clear(&commits);
1207                                 die_with_unpushed_submodules(&needs_pushing);
1208                         }
1209                         string_list_clear(&needs_pushing, 0);
1210                         oid_array_clear(&commits);
1211                 }
1212
1213                 if (!(flags & TRANSPORT_RECURSE_SUBMODULES_ONLY))
1214                         push_ret = transport->vtable->push_refs(transport, remote_refs, flags);
1215                 else
1216                         push_ret = 0;
1217                 err = push_had_errors(remote_refs);
1218                 ret = push_ret | err;
1219
1220                 if (!quiet || err)
1221                         transport_print_push_status(transport->url, remote_refs,
1222                                         verbose | porcelain, porcelain,
1223                                         reject_reasons);
1224
1225                 if (flags & TRANSPORT_PUSH_SET_UPSTREAM)
1226                         set_upstreams(transport, remote_refs, pretend);
1227
1228                 if (!(flags & (TRANSPORT_PUSH_DRY_RUN |
1229                                TRANSPORT_RECURSE_SUBMODULES_ONLY))) {
1230                         struct ref *ref;
1231                         for (ref = remote_refs; ref; ref = ref->next)
1232                                 transport_update_tracking_ref(transport->remote, ref, verbose);
1233                 }
1234
1235                 if (porcelain && !push_ret)
1236                         puts("Done");
1237                 else if (!quiet && !ret && !transport_refs_pushed(remote_refs))
1238                         fprintf(stderr, "Everything up-to-date\n");
1239
1240                 return ret;
1241         }
1242         return 1;
1243 }
1244
1245 const struct ref *transport_get_remote_refs(struct transport *transport,
1246                                             const struct argv_array *ref_prefixes)
1247 {
1248         if (!transport->got_remote_refs) {
1249                 transport->remote_refs =
1250                         transport->vtable->get_refs_list(transport, 0,
1251                                                          ref_prefixes);
1252                 transport->got_remote_refs = 1;
1253         }
1254
1255         return transport->remote_refs;
1256 }
1257
1258 int transport_fetch_refs(struct transport *transport, struct ref *refs)
1259 {
1260         int rc;
1261         int nr_heads = 0, nr_alloc = 0, nr_refs = 0;
1262         struct ref **heads = NULL;
1263         struct ref *rm;
1264
1265         if (!transport->vtable->fetch_without_list)
1266                 /*
1267                  * Some transports (e.g. the built-in bundle transport and the
1268                  * transport helper interface) do not work when fetching is
1269                  * done immediately after transport creation. List the remote
1270                  * refs anyway (if not already listed) as a workaround.
1271                  */
1272                 transport_get_remote_refs(transport, NULL);
1273
1274         for (rm = refs; rm; rm = rm->next) {
1275                 nr_refs++;
1276                 if (rm->peer_ref &&
1277                     !is_null_oid(&rm->old_oid) &&
1278                     oideq(&rm->peer_ref->old_oid, &rm->old_oid))
1279                         continue;
1280                 ALLOC_GROW(heads, nr_heads + 1, nr_alloc);
1281                 heads[nr_heads++] = rm;
1282         }
1283
1284         if (!nr_heads) {
1285                 /*
1286                  * When deepening of a shallow repository is requested,
1287                  * then local and remote refs are likely to still be equal.
1288                  * Just feed them all to the fetch method in that case.
1289                  * This condition shouldn't be met in a non-deepening fetch
1290                  * (see builtin/fetch.c:quickfetch()).
1291                  */
1292                 ALLOC_ARRAY(heads, nr_refs);
1293                 for (rm = refs; rm; rm = rm->next)
1294                         heads[nr_heads++] = rm;
1295         }
1296
1297         rc = transport->vtable->fetch(transport, nr_heads, heads);
1298
1299         free(heads);
1300         return rc;
1301 }
1302
1303 void transport_unlock_pack(struct transport *transport)
1304 {
1305         if (transport->pack_lockfile) {
1306                 unlink_or_warn(transport->pack_lockfile);
1307                 FREE_AND_NULL(transport->pack_lockfile);
1308         }
1309 }
1310
1311 int transport_connect(struct transport *transport, const char *name,
1312                       const char *exec, int fd[2])
1313 {
1314         if (transport->vtable->connect)
1315                 return transport->vtable->connect(transport, name, exec, fd);
1316         else
1317                 die(_("operation not supported by protocol"));
1318 }
1319
1320 int transport_disconnect(struct transport *transport)
1321 {
1322         int ret = 0;
1323         if (transport->vtable->disconnect)
1324                 ret = transport->vtable->disconnect(transport);
1325         free(transport);
1326         return ret;
1327 }
1328
1329 /*
1330  * Strip username (and password) from a URL and return
1331  * it in a newly allocated string.
1332  */
1333 char *transport_anonymize_url(const char *url)
1334 {
1335         char *scheme_prefix, *anon_part;
1336         size_t anon_len, prefix_len = 0;
1337
1338         anon_part = strchr(url, '@');
1339         if (url_is_local_not_ssh(url) || !anon_part)
1340                 goto literal_copy;
1341
1342         anon_len = strlen(++anon_part);
1343         scheme_prefix = strstr(url, "://");
1344         if (!scheme_prefix) {
1345                 if (!strchr(anon_part, ':'))
1346                         /* cannot be "me@there:/path/name" */
1347                         goto literal_copy;
1348         } else {
1349                 const char *cp;
1350                 /* make sure scheme is reasonable */
1351                 for (cp = url; cp < scheme_prefix; cp++) {
1352                         switch (*cp) {
1353                                 /* RFC 1738 2.1 */
1354                         case '+': case '.': case '-':
1355                                 break; /* ok */
1356                         default:
1357                                 if (isalnum(*cp))
1358                                         break;
1359                                 /* it isn't */
1360                                 goto literal_copy;
1361                         }
1362                 }
1363                 /* @ past the first slash does not count */
1364                 cp = strchr(scheme_prefix + 3, '/');
1365                 if (cp && cp < anon_part)
1366                         goto literal_copy;
1367                 prefix_len = scheme_prefix - url + 3;
1368         }
1369         return xstrfmt("%.*s%.*s", (int)prefix_len, url,
1370                        (int)anon_len, anon_part);
1371 literal_copy:
1372         return xstrdup(url);
1373 }
1374
1375 static void fill_alternate_refs_command(struct child_process *cmd,
1376                                         const char *repo_path)
1377 {
1378         const char *value;
1379
1380         if (!git_config_get_value("core.alternateRefsCommand", &value)) {
1381                 cmd->use_shell = 1;
1382
1383                 argv_array_push(&cmd->args, value);
1384                 argv_array_push(&cmd->args, repo_path);
1385         } else {
1386                 cmd->git_cmd = 1;
1387
1388                 argv_array_pushf(&cmd->args, "--git-dir=%s", repo_path);
1389                 argv_array_push(&cmd->args, "for-each-ref");
1390                 argv_array_push(&cmd->args, "--format=%(objectname)");
1391
1392                 if (!git_config_get_value("core.alternateRefsPrefixes", &value)) {
1393                         argv_array_push(&cmd->args, "--");
1394                         argv_array_split(&cmd->args, value);
1395                 }
1396         }
1397
1398         cmd->env = local_repo_env;
1399         cmd->out = -1;
1400 }
1401
1402 static void read_alternate_refs(const char *path,
1403                                 alternate_ref_fn *cb,
1404                                 void *data)
1405 {
1406         struct child_process cmd = CHILD_PROCESS_INIT;
1407         struct strbuf line = STRBUF_INIT;
1408         FILE *fh;
1409
1410         fill_alternate_refs_command(&cmd, path);
1411
1412         if (start_command(&cmd))
1413                 return;
1414
1415         fh = xfdopen(cmd.out, "r");
1416         while (strbuf_getline_lf(&line, fh) != EOF) {
1417                 struct object_id oid;
1418                 const char *p;
1419
1420                 if (parse_oid_hex(line.buf, &oid, &p) || *p) {
1421                         warning(_("invalid line while parsing alternate refs: %s"),
1422                                 line.buf);
1423                         break;
1424                 }
1425
1426                 cb(&oid, data);
1427         }
1428
1429         fclose(fh);
1430         finish_command(&cmd);
1431 }
1432
1433 struct alternate_refs_data {
1434         alternate_ref_fn *fn;
1435         void *data;
1436 };
1437
1438 static int refs_from_alternate_cb(struct object_directory *e,
1439                                   void *data)
1440 {
1441         struct strbuf path = STRBUF_INIT;
1442         size_t base_len;
1443         struct alternate_refs_data *cb = data;
1444
1445         if (!strbuf_realpath(&path, e->path, 0))
1446                 goto out;
1447         if (!strbuf_strip_suffix(&path, "/objects"))
1448                 goto out;
1449         base_len = path.len;
1450
1451         /* Is this a git repository with refs? */
1452         strbuf_addstr(&path, "/refs");
1453         if (!is_directory(path.buf))
1454                 goto out;
1455         strbuf_setlen(&path, base_len);
1456
1457         read_alternate_refs(path.buf, cb->fn, cb->data);
1458
1459 out:
1460         strbuf_release(&path);
1461         return 0;
1462 }
1463
1464 void for_each_alternate_ref(alternate_ref_fn fn, void *data)
1465 {
1466         struct alternate_refs_data cb;
1467         cb.fn = fn;
1468         cb.data = data;
1469         foreach_alt_odb(refs_from_alternate_cb, &cb);
1470 }