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 "oid-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         unsigned get_refs_from_bundle_called : 1;
 126 };
 127
 128 static struct ref *get_refs_from_bundle(struct transport *transport,
 129                                         int for_push,
 130                                         const struct argv_array *ref_prefixes)
 131 {
 132         struct bundle_transport_data *data = transport->data;
 133         struct ref *result = NULL;
 134         int i;
 135
 136         if (for_push)
 137                 return NULL;
 138
 139         data->get_refs_from_bundle_called = 1;
 140
 141         if (data->fd > 0)
 142                 close(data->fd);
 143         data->fd = read_bundle_header(transport->url, &data->header);
 144         if (data->fd < 0)
 145                 die(_("could not read bundle '%s'"), transport->url);
 146         for (i = 0; i < data->header.references.nr; i++) {
 147                 struct ref_list_entry *e = data->header.references.list + i;
 148                 struct ref *ref = alloc_ref(e->name);
 149                 oidcpy(&ref->old_oid, &e->oid);
 150                 ref->next = result;
 151                 result = ref;
 152         }
 153         return result;
 154 }
 155
 156 static int fetch_refs_from_bundle(struct transport *transport,
 157                                int nr_heads, struct ref **to_fetch)
 158 {
 159         struct bundle_transport_data *data = transport->data;
 160
 161         if (!data->get_refs_from_bundle_called)
 162                 get_refs_from_bundle(transport, 0, NULL);
 163         return unbundle(the_repository, &data->header, data->fd,
 164                         transport->progress ? BUNDLE_VERBOSE : 0);
 165 }
 166
 167 static int close_bundle(struct transport *transport)
 168 {
 169         struct bundle_transport_data *data = transport->data;
 170         if (data->fd > 0)
 171                 close(data->fd);
 172         free(data);
 173         return 0;
 174 }
 175
 176 struct git_transport_data {
 177         struct git_transport_options options;
 178         struct child_process *conn;
 179         int fd[2];
 180         unsigned got_remote_heads : 1;
 181         enum protocol_version version;
 182         struct oid_array extra_have;
 183         struct oid_array shallow;
 184 };
 185
 186 static int set_git_option(struct git_transport_options *opts,
 187                           const char *name, const char *value)
 188 {
 189         if (!strcmp(name, TRANS_OPT_UPLOADPACK)) {
 190                 opts->uploadpack = value;
 191                 return 0;
 192         } else if (!strcmp(name, TRANS_OPT_RECEIVEPACK)) {
 193                 opts->receivepack = value;
 194                 return 0;
 195         } else if (!strcmp(name, TRANS_OPT_THIN)) {
 196                 opts->thin = !!value;
 197                 return 0;
 198         } else if (!strcmp(name, TRANS_OPT_FOLLOWTAGS)) {
 199                 opts->followtags = !!value;
 200                 return 0;
 201         } else if (!strcmp(name, TRANS_OPT_KEEP)) {
 202                 opts->keep = !!value;
 203                 return 0;
 204         } else if (!strcmp(name, TRANS_OPT_UPDATE_SHALLOW)) {
 205                 opts->update_shallow = !!value;
 206                 return 0;
 207         } else if (!strcmp(name, TRANS_OPT_DEPTH)) {
 208                 if (!value)
 209                         opts->depth = 0;
 210                 else {
 211                         char *end;
 212                         opts->depth = strtol(value, &end, 0);
 213                         if (*end)
 214                                 die(_("transport: invalid depth option '%s'"), value);
 215                 }
 216                 return 0;
 217         } else if (!strcmp(name, TRANS_OPT_DEEPEN_SINCE)) {
 218                 opts->deepen_since = value;
 219                 return 0;
 220         } else if (!strcmp(name, TRANS_OPT_DEEPEN_NOT)) {
 221                 opts->deepen_not = (const struct string_list *)value;
 222                 return 0;
 223         } else if (!strcmp(name, TRANS_OPT_DEEPEN_RELATIVE)) {
 224                 opts->deepen_relative = !!value;
 225                 return 0;
 226         } else if (!strcmp(name, TRANS_OPT_FROM_PROMISOR)) {
 227                 opts->from_promisor = !!value;
 228                 return 0;
 229         } else if (!strcmp(name, TRANS_OPT_NO_DEPENDENTS)) {
 230                 opts->no_dependents = !!value;
 231                 return 0;
 232         } else if (!strcmp(name, TRANS_OPT_LIST_OBJECTS_FILTER)) {
 233                 list_objects_filter_die_if_populated(&opts->filter_options);
 234                 parse_list_objects_filter(&opts->filter_options, value);
 235                 return 0;
 236         }
 237         return 1;
 238 }
 239
 240 static int connect_setup(struct transport *transport, int for_push)
 241 {
 242         struct git_transport_data *data = transport->data;
 243         int flags = transport->verbose > 0 ? CONNECT_VERBOSE : 0;
 244
 245         if (data->conn)
 246                 return 0;
 247
 248         switch (transport->family) {
 249         case TRANSPORT_FAMILY_ALL: break;
 250         case TRANSPORT_FAMILY_IPV4: flags |= CONNECT_IPV4; break;
 251         case TRANSPORT_FAMILY_IPV6: flags |= CONNECT_IPV6; break;
 252         }
 253
 254         data->conn = git_connect(data->fd, transport->url,
 255                                  for_push ? data->options.receivepack :
 256                                  data->options.uploadpack,
 257                                  flags);
 258
 259         return 0;
 260 }
 261
 262 static void die_if_server_options(struct transport *transport)
 263 {
 264         if (!transport->server_options || !transport->server_options->nr)
 265                 return;
 266         advise(_("see protocol.version in 'git help config' for more details"));
 267         die(_("server options require protocol version 2 or later"));
 268 }
 269
 270 /*
 271  * Obtains the protocol version from the transport and writes it to
 272  * transport->data->version, first connecting if not already connected.
 273  *
 274  * If the protocol version is one that allows skipping the listing of remote
 275  * refs, and must_list_refs is 0, the listing of remote refs is skipped and
 276  * this function returns NULL. Otherwise, this function returns the list of
 277  * remote refs.
 278  */
 279 static struct ref *handshake(struct transport *transport, int for_push,
 280                              const struct argv_array *ref_prefixes,
 281                              int must_list_refs)
 282 {
 283         struct git_transport_data *data = transport->data;
 284         struct ref *refs = NULL;
 285         struct packet_reader reader;
 286
 287         connect_setup(transport, for_push);
 288
 289         packet_reader_init(&reader, data->fd[0], NULL, 0,
 290                            PACKET_READ_CHOMP_NEWLINE |
 291                            PACKET_READ_GENTLE_ON_EOF |
 292                            PACKET_READ_DIE_ON_ERR_PACKET);
 293
 294         data->version = discover_version(&reader);
 295         switch (data->version) {
 296         case protocol_v2:
 297                 if (must_list_refs)
 298                         get_remote_refs(data->fd[1], &reader, &refs, for_push,
 299                                         ref_prefixes,
 300                                         transport->server_options,
 301                                         transport->stateless_rpc);
 302                 break;
 303         case protocol_v1:
 304         case protocol_v0:
 305                 die_if_server_options(transport);
 306                 get_remote_heads(&reader, &refs,
 307                                  for_push ? REF_NORMAL : 0,
 308                                  &data->extra_have,
 309                                  &data->shallow);
 310                 break;
 311         case protocol_unknown_version:
 312                 BUG("unknown protocol version");
 313         }
 314         data->got_remote_heads = 1;
 315
 316         if (reader.line_peeked)
 317                 BUG("buffer must be empty at the end of handshake()");
 318
 319         return refs;
 320 }
 321
 322 static struct ref *get_refs_via_connect(struct transport *transport, int for_push,
 323                                         const struct argv_array *ref_prefixes)
 324 {
 325         return handshake(transport, for_push, ref_prefixes, 1);
 326 }
 327
 328 static int fetch_refs_via_pack(struct transport *transport,
 329                                int nr_heads, struct ref **to_fetch)
 330 {
 331         int ret = 0;
 332         struct git_transport_data *data = transport->data;
 333         struct ref *refs = NULL;
 334         struct fetch_pack_args args;
 335         struct ref *refs_tmp = NULL;
 336
 337         memset(&args, 0, sizeof(args));
 338         args.uploadpack = data->options.uploadpack;
 339         args.keep_pack = data->options.keep;
 340         args.lock_pack = 1;
 341         args.use_thin_pack = data->options.thin;
 342         args.include_tag = data->options.followtags;
 343         args.verbose = (transport->verbose > 1);
 344         args.quiet = (transport->verbose < 0);
 345         args.no_progress = !transport->progress;
 346         args.depth = data->options.depth;
 347         args.deepen_since = data->options.deepen_since;
 348         args.deepen_not = data->options.deepen_not;
 349         args.deepen_relative = data->options.deepen_relative;
 350         args.check_self_contained_and_connected =
 351                 data->options.check_self_contained_and_connected;
 352         args.cloning = transport->cloning;
 353         args.update_shallow = data->options.update_shallow;
 354         args.from_promisor = data->options.from_promisor;
 355         args.no_dependents = data->options.no_dependents;
 356         args.filter_options = data->options.filter_options;
 357         args.stateless_rpc = transport->stateless_rpc;
 358         args.server_options = transport->server_options;
 359         args.negotiation_tips = data->options.negotiation_tips;
 360
 361         if (!data->got_remote_heads) {
 362                 int i;
 363                 int must_list_refs = 0;
 364                 for (i = 0; i < nr_heads; i++) {
 365                         if (!to_fetch[i]->exact_oid) {
 366                                 must_list_refs = 1;
 367                                 break;
 368                         }
 369                 }
 370                 refs_tmp = handshake(transport, 0, NULL, must_list_refs);
 371         }
 372
 373         if (data->version == protocol_unknown_version)
 374                 BUG("unknown protocol version");
 375         else if (data->version <= protocol_v1)
 376                 die_if_server_options(transport);
 377
 378         refs = fetch_pack(&args, data->fd,
 379                           refs_tmp ? refs_tmp : transport->remote_refs,
 380                           to_fetch, nr_heads, &data->shallow,
 381                           &transport->pack_lockfile, data->version);
 382
 383         close(data->fd[0]);
 384         close(data->fd[1]);
 385         if (finish_connect(data->conn))
 386                 ret = -1;
 387         data->conn = NULL;
 388         data->got_remote_heads = 0;
 389         data->options.self_contained_and_connected =
 390                 args.self_contained_and_connected;
 391         data->options.connectivity_checked = args.connectivity_checked;
 392
 393         if (refs == NULL)
 394                 ret = -1;
 395         if (report_unmatched_refs(to_fetch, nr_heads))
 396                 ret = -1;
 397
 398         free_refs(refs_tmp);
 399         free_refs(refs);
 400         return ret;
 401 }
 402
 403 static int push_had_errors(struct ref *ref)
 404 {
 405         for (; ref; ref = ref->next) {
 406                 switch (ref->status) {
 407                 case REF_STATUS_NONE:
 408                 case REF_STATUS_UPTODATE:
 409                 case REF_STATUS_OK:
 410                         break;
 411                 default:
 412                         return 1;
 413                 }
 414         }
 415         return 0;
 416 }
 417
 418 int transport_refs_pushed(struct ref *ref)
 419 {
 420         for (; ref; ref = ref->next) {
 421                 switch(ref->status) {
 422                 case REF_STATUS_NONE:
 423                 case REF_STATUS_UPTODATE:
 424                         break;
 425                 default:
 426                         return 1;
 427                 }
 428         }
 429         return 0;
 430 }
 431
 432 void transport_update_tracking_ref(struct remote *remote, struct ref *ref, int verbose)
 433 {
 434         struct refspec_item rs;
 435
 436         if (ref->status != REF_STATUS_OK && ref->status != REF_STATUS_UPTODATE)
 437                 return;
 438
 439         rs.src = ref->name;
 440         rs.dst = NULL;
 441
 442         if (!remote_find_tracking(remote, &rs)) {
 443                 if (verbose)
 444                         fprintf(stderr, "updating local tracking ref '%s'\n", rs.dst);
 445                 if (ref->deletion) {
 446                         delete_ref(NULL, rs.dst, NULL, 0);
 447                 } else
 448                         update_ref("update by push", rs.dst, &ref->new_oid,
 449                                    NULL, 0, 0);
 450                 free(rs.dst);
 451         }
 452 }
 453
 454 static void print_ref_status(char flag, const char *summary,
 455                              struct ref *to, struct ref *from, const char *msg,
 456                              int porcelain, int summary_width)
 457 {
 458         if (porcelain) {
 459                 if (from)
 460                         fprintf(stdout, "%c\t%s:%s\t", flag, from->name, to->name);
 461                 else
 462                         fprintf(stdout, "%c\t:%s\t", flag, to->name);
 463                 if (msg)
 464                         fprintf(stdout, "%s (%s)\n", summary, msg);
 465                 else
 466                         fprintf(stdout, "%s\n", summary);
 467         } else {
 468                 const char *red = "", *reset = "";
 469                 if (push_had_errors(to)) {
 470                         red = transport_get_color(TRANSPORT_COLOR_REJECTED);
 471                         reset = transport_get_color(TRANSPORT_COLOR_RESET);
 472                 }
 473                 fprintf(stderr, " %s%c %-*s%s ", red, flag, summary_width,
 474                         summary, reset);
 475                 if (from)
 476                         fprintf(stderr, "%s -> %s", prettify_refname(from->name), prettify_refname(to->name));
 477                 else
 478                         fputs(prettify_refname(to->name), stderr);
 479                 if (msg) {
 480                         fputs(" (", stderr);
 481                         fputs(msg, stderr);
 482                         fputc(')', stderr);
 483                 }
 484                 fputc('\n', stderr);
 485         }
 486 }
 487
 488 static void print_ok_ref_status(struct ref *ref, int porcelain, int summary_width)
 489 {
 490         if (ref->deletion)
 491                 print_ref_status('-', "[deleted]", ref, NULL, NULL,
 492                                  porcelain, summary_width);
 493         else if (is_null_oid(&ref->old_oid))
 494                 print_ref_status('*',
 495                         (starts_with(ref->name, "refs/tags/") ? "[new tag]" :
 496                         "[new branch]"),
 497                         ref, ref->peer_ref, NULL, porcelain, summary_width);
 498         else {
 499                 struct strbuf quickref = STRBUF_INIT;
 500                 char type;
 501                 const char *msg;
 502
 503                 strbuf_add_unique_abbrev(&quickref, &ref->old_oid,
 504                                          DEFAULT_ABBREV);
 505                 if (ref->forced_update) {
 506                         strbuf_addstr(&quickref, "...");
 507                         type = '+';
 508                         msg = "forced update";
 509                 } else {
 510                         strbuf_addstr(&quickref, "..");
 511                         type = ' ';
 512                         msg = NULL;
 513                 }
 514                 strbuf_add_unique_abbrev(&quickref, &ref->new_oid,
 515                                          DEFAULT_ABBREV);
 516
 517                 print_ref_status(type, quickref.buf, ref, ref->peer_ref, msg,
 518                                  porcelain, summary_width);
 519                 strbuf_release(&quickref);
 520         }
 521 }
 522
 523 static int print_one_push_status(struct ref *ref, const char *dest, int count,
 524                                  int porcelain, int summary_width)
 525 {
 526         if (!count) {
 527                 char *url = transport_anonymize_url(dest);
 528                 fprintf(porcelain ? stdout : stderr, "To %s\n", url);
 529                 free(url);
 530         }
 531
 532         switch(ref->status) {
 533         case REF_STATUS_NONE:
 534                 print_ref_status('X', "[no match]", ref, NULL, NULL,
 535                                  porcelain, summary_width);
 536                 break;
 537         case REF_STATUS_REJECT_NODELETE:
 538                 print_ref_status('!', "[rejected]", ref, NULL,
 539                                  "remote does not support deleting refs",
 540                                  porcelain, summary_width);
 541                 break;
 542         case REF_STATUS_UPTODATE:
 543                 print_ref_status('=', "[up to date]", ref,
 544                                  ref->peer_ref, NULL, porcelain, summary_width);
 545                 break;
 546         case REF_STATUS_REJECT_NONFASTFORWARD:
 547                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 548                                  "non-fast-forward", porcelain, summary_width);
 549                 break;
 550         case REF_STATUS_REJECT_ALREADY_EXISTS:
 551                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 552                                  "already exists", porcelain, summary_width);
 553                 break;
 554         case REF_STATUS_REJECT_FETCH_FIRST:
 555                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 556                                  "fetch first", porcelain, summary_width);
 557                 break;
 558         case REF_STATUS_REJECT_NEEDS_FORCE:
 559                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 560                                  "needs force", porcelain, summary_width);
 561                 break;
 562         case REF_STATUS_REJECT_STALE:
 563                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 564                                  "stale info", porcelain, summary_width);
 565                 break;
 566         case REF_STATUS_REJECT_SHALLOW:
 567                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 568                                  "new shallow roots not allowed",
 569                                  porcelain, summary_width);
 570                 break;
 571         case REF_STATUS_REMOTE_REJECT:
 572                 print_ref_status('!', "[remote rejected]", ref,
 573                                  ref->deletion ? NULL : ref->peer_ref,
 574                                  ref->remote_status, porcelain, summary_width);
 575                 break;
 576         case REF_STATUS_EXPECTING_REPORT:
 577                 print_ref_status('!', "[remote failure]", ref,
 578                                  ref->deletion ? NULL : ref->peer_ref,
 579                                  "remote failed to report status",
 580                                  porcelain, summary_width);
 581                 break;
 582         case REF_STATUS_ATOMIC_PUSH_FAILED:
 583                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 584                                  "atomic push failed", porcelain, summary_width);
 585                 break;
 586         case REF_STATUS_OK:
 587                 print_ok_ref_status(ref, porcelain, summary_width);
 588                 break;
 589         }
 590
 591         return 1;
 592 }
 593
 594 static int measure_abbrev(const struct object_id *oid, int sofar)
 595 {
 596         char hex[GIT_MAX_HEXSZ + 1];
 597         int w = find_unique_abbrev_r(hex, oid, DEFAULT_ABBREV);
 598
 599         return (w < sofar) ? sofar : w;
 600 }
 601
 602 int transport_summary_width(const struct ref *refs)
 603 {
 604         int maxw = -1;
 605
 606         for (; refs; refs = refs->next) {
 607                 maxw = measure_abbrev(&refs->old_oid, maxw);
 608                 maxw = measure_abbrev(&refs->new_oid, maxw);
 609         }
 610         if (maxw < 0)
 611                 maxw = FALLBACK_DEFAULT_ABBREV;
 612         return (2 * maxw + 3);
 613 }
 614
 615 void transport_print_push_status(const char *dest, struct ref *refs,
 616                                   int verbose, int porcelain, unsigned int *reject_reasons)
 617 {
 618         struct ref *ref;
 619         int n = 0;
 620         char *head;
 621         int summary_width = transport_summary_width(refs);
 622
 623         if (transport_color_config() < 0)
 624                 warning(_("could not parse transport.color.* config"));
 625
 626         head = resolve_refdup("HEAD", RESOLVE_REF_READING, NULL, NULL);
 627
 628         if (verbose) {
 629                 for (ref = refs; ref; ref = ref->next)
 630                         if (ref->status == REF_STATUS_UPTODATE)
 631                                 n += print_one_push_status(ref, dest, n,
 632                                                            porcelain, summary_width);
 633         }
 634
 635         for (ref = refs; ref; ref = ref->next)
 636                 if (ref->status == REF_STATUS_OK)
 637                         n += print_one_push_status(ref, dest, n,
 638                                                    porcelain, summary_width);
 639
 640         *reject_reasons = 0;
 641         for (ref = refs; ref; ref = ref->next) {
 642                 if (ref->status != REF_STATUS_NONE &&
 643                     ref->status != REF_STATUS_UPTODATE &&
 644                     ref->status != REF_STATUS_OK)
 645                         n += print_one_push_status(ref, dest, n,
 646                                                    porcelain, summary_width);
 647                 if (ref->status == REF_STATUS_REJECT_NONFASTFORWARD) {
 648                         if (head != NULL && !strcmp(head, ref->name))
 649                                 *reject_reasons |= REJECT_NON_FF_HEAD;
 650                         else
 651                                 *reject_reasons |= REJECT_NON_FF_OTHER;
 652                 } else if (ref->status == REF_STATUS_REJECT_ALREADY_EXISTS) {
 653                         *reject_reasons |= REJECT_ALREADY_EXISTS;
 654                 } else if (ref->status == REF_STATUS_REJECT_FETCH_FIRST) {
 655                         *reject_reasons |= REJECT_FETCH_FIRST;
 656                 } else if (ref->status == REF_STATUS_REJECT_NEEDS_FORCE) {
 657                         *reject_reasons |= REJECT_NEEDS_FORCE;
 658                 }
 659         }
 660         free(head);
 661 }
 662
 663 static int git_transport_push(struct transport *transport, struct ref *remote_refs, int flags)
 664 {
 665         struct git_transport_data *data = transport->data;
 666         struct send_pack_args args;
 667         int ret = 0;
 668
 669         if (transport_color_config() < 0)
 670                 return -1;
 671
 672         if (!data->got_remote_heads)
 673                 get_refs_via_connect(transport, 1, NULL);
 674
 675         memset(&args, 0, sizeof(args));
 676         args.send_mirror = !!(flags & TRANSPORT_PUSH_MIRROR);
 677         args.force_update = !!(flags & TRANSPORT_PUSH_FORCE);
 678         args.use_thin_pack = data->options.thin;
 679         args.verbose = (transport->verbose > 0);
 680         args.quiet = (transport->verbose < 0);
 681         args.progress = transport->progress;
 682         args.dry_run = !!(flags & TRANSPORT_PUSH_DRY_RUN);
 683         args.porcelain = !!(flags & TRANSPORT_PUSH_PORCELAIN);
 684         args.atomic = !!(flags & TRANSPORT_PUSH_ATOMIC);
 685         args.push_options = transport->push_options;
 686         args.url = transport->url;
 687
 688         if (flags & TRANSPORT_PUSH_CERT_ALWAYS)
 689                 args.push_cert = SEND_PACK_PUSH_CERT_ALWAYS;
 690         else if (flags & TRANSPORT_PUSH_CERT_IF_ASKED)
 691                 args.push_cert = SEND_PACK_PUSH_CERT_IF_ASKED;
 692         else
 693                 args.push_cert = SEND_PACK_PUSH_CERT_NEVER;
 694
 695         switch (data->version) {
 696         case protocol_v2:
 697                 die(_("support for protocol v2 not implemented yet"));
 698                 break;
 699         case protocol_v1:
 700         case protocol_v0:
 701                 ret = send_pack(&args, data->fd, data->conn, remote_refs,
 702                                 &data->extra_have);
 703                 break;
 704         case protocol_unknown_version:
 705                 BUG("unknown protocol version");
 706         }
 707
 708         close(data->fd[1]);
 709         close(data->fd[0]);
 710         /*
 711          * Atomic push may abort the connection early and close the pipe,
 712          * which may cause an error for `finish_connect()`. Ignore this error
 713          * for atomic git-push.
 714          */
 715         if (ret || args.atomic)
 716                 finish_connect(data->conn);
 717         else
 718                 ret = finish_connect(data->conn);
 719         data->conn = NULL;
 720         data->got_remote_heads = 0;
 721
 722         return ret;
 723 }
 724
 725 static int connect_git(struct transport *transport, const char *name,
 726                        const char *executable, int fd[2])
 727 {
 728         struct git_transport_data *data = transport->data;
 729         data->conn = git_connect(data->fd, transport->url,
 730                                  executable, 0);
 731         fd[0] = data->fd[0];
 732         fd[1] = data->fd[1];
 733         return 0;
 734 }
 735
 736 static int disconnect_git(struct transport *transport)
 737 {
 738         struct git_transport_data *data = transport->data;
 739         if (data->conn) {
 740                 if (data->got_remote_heads && !transport->stateless_rpc)
 741                         packet_flush(data->fd[1]);
 742                 close(data->fd[0]);
 743                 close(data->fd[1]);
 744                 finish_connect(data->conn);
 745         }
 746
 747         free(data);
 748         return 0;
 749 }
 750
 751 static struct transport_vtable taken_over_vtable = {
 752         NULL,
 753         get_refs_via_connect,
 754         fetch_refs_via_pack,
 755         git_transport_push,
 756         NULL,
 757         disconnect_git
 758 };
 759
 760 void transport_take_over(struct transport *transport,
 761                          struct child_process *child)
 762 {
 763         struct git_transport_data *data;
 764
 765         if (!transport->smart_options)
 766                 BUG("taking over transport requires non-NULL "
 767                     "smart_options field.");
 768
 769         data = xcalloc(1, sizeof(*data));
 770         data->options = *transport->smart_options;
 771         data->conn = child;
 772         data->fd[0] = data->conn->out;
 773         data->fd[1] = data->conn->in;
 774         data->got_remote_heads = 0;
 775         transport->data = data;
 776
 777         transport->vtable = &taken_over_vtable;
 778         transport->smart_options = &(data->options);
 779
 780         transport->cannot_reuse = 1;
 781 }
 782
 783 static int is_file(const char *url)
 784 {
 785         struct stat buf;
 786         if (stat(url, &buf))
 787                 return 0;
 788         return S_ISREG(buf.st_mode);
 789 }
 790
 791 static int external_specification_len(const char *url)
 792 {
 793         return strchr(url, ':') - url;
 794 }
 795
 796 static const struct string_list *protocol_whitelist(void)
 797 {
 798         static int enabled = -1;
 799         static struct string_list allowed = STRING_LIST_INIT_DUP;
 800
 801         if (enabled < 0) {
 802                 const char *v = getenv("GIT_ALLOW_PROTOCOL");
 803                 if (v) {
 804                         string_list_split(&allowed, v, ':', -1);
 805                         string_list_sort(&allowed);
 806                         enabled = 1;
 807                 } else {
 808                         enabled = 0;
 809                 }
 810         }
 811
 812         return enabled ? &allowed : NULL;
 813 }
 814
 815 enum protocol_allow_config {
 816         PROTOCOL_ALLOW_NEVER = 0,
 817         PROTOCOL_ALLOW_USER_ONLY,
 818         PROTOCOL_ALLOW_ALWAYS
 819 };
 820
 821 static enum protocol_allow_config parse_protocol_config(const char *key,
 822                                                         const char *value)
 823 {
 824         if (!strcasecmp(value, "always"))
 825                 return PROTOCOL_ALLOW_ALWAYS;
 826         else if (!strcasecmp(value, "never"))
 827                 return PROTOCOL_ALLOW_NEVER;
 828         else if (!strcasecmp(value, "user"))
 829                 return PROTOCOL_ALLOW_USER_ONLY;
 830
 831         die(_("unknown value for config '%s': %s"), key, value);
 832 }
 833
 834 static enum protocol_allow_config get_protocol_config(const char *type)
 835 {
 836         char *key = xstrfmt("protocol.%s.allow", type);
 837         char *value;
 838
 839         /* first check the per-protocol config */
 840         if (!git_config_get_string(key, &value)) {
 841                 enum protocol_allow_config ret =
 842                         parse_protocol_config(key, value);
 843                 free(key);
 844                 free(value);
 845                 return ret;
 846         }
 847         free(key);
 848
 849         /* if defined, fallback to user-defined default for unknown protocols */
 850         if (!git_config_get_string("protocol.allow", &value)) {
 851                 enum protocol_allow_config ret =
 852                         parse_protocol_config("protocol.allow", value);
 853                 free(value);
 854                 return ret;
 855         }
 856
 857         /* fallback to built-in defaults */
 858         /* known safe */
 859         if (!strcmp(type, "http") ||
 860             !strcmp(type, "https") ||
 861             !strcmp(type, "git") ||
 862             !strcmp(type, "ssh") ||
 863             !strcmp(type, "file"))
 864                 return PROTOCOL_ALLOW_ALWAYS;
 865
 866         /* known scary; err on the side of caution */
 867         if (!strcmp(type, "ext"))
 868                 return PROTOCOL_ALLOW_NEVER;
 869
 870         /* unknown; by default let them be used only directly by the user */
 871         return PROTOCOL_ALLOW_USER_ONLY;
 872 }
 873
 874 int is_transport_allowed(const char *type, int from_user)
 875 {
 876         const struct string_list *whitelist = protocol_whitelist();
 877         if (whitelist)
 878                 return string_list_has_string(whitelist, type);
 879
 880         switch (get_protocol_config(type)) {
 881         case PROTOCOL_ALLOW_ALWAYS:
 882                 return 1;
 883         case PROTOCOL_ALLOW_NEVER:
 884                 return 0;
 885         case PROTOCOL_ALLOW_USER_ONLY:
 886                 if (from_user < 0)
 887                         from_user = git_env_bool("GIT_PROTOCOL_FROM_USER", 1);
 888                 return from_user;
 889         }
 890
 891         BUG("invalid protocol_allow_config type");
 892 }
 893
 894 void transport_check_allowed(const char *type)
 895 {
 896         if (!is_transport_allowed(type, -1))
 897                 die(_("transport '%s' not allowed"), type);
 898 }
 899
 900 static struct transport_vtable bundle_vtable = {
 901         NULL,
 902         get_refs_from_bundle,
 903         fetch_refs_from_bundle,
 904         NULL,
 905         NULL,
 906         close_bundle
 907 };
 908
 909 static struct transport_vtable builtin_smart_vtable = {
 910         NULL,
 911         get_refs_via_connect,
 912         fetch_refs_via_pack,
 913         git_transport_push,
 914         connect_git,
 915         disconnect_git
 916 };
 917
 918 struct transport *transport_get(struct remote *remote, const char *url)
 919 {
 920         const char *helper;
 921         struct transport *ret = xcalloc(1, sizeof(*ret));
 922
 923         ret->progress = isatty(2);
 924
 925         if (!remote)
 926                 BUG("No remote provided to transport_get()");
 927
 928         ret->got_remote_refs = 0;
 929         ret->remote = remote;
 930         helper = remote->foreign_vcs;
 931
 932         if (!url && remote->url)
 933                 url = remote->url[0];
 934         ret->url = url;
 935
 936         /* maybe it is a foreign URL? */
 937         if (url) {
 938                 const char *p = url;
 939
 940                 while (is_urlschemechar(p == url, *p))
 941                         p++;
 942                 if (starts_with(p, "::"))
 943                         helper = xstrndup(url, p - url);
 944         }
 945
 946         if (helper) {
 947                 transport_helper_init(ret, helper);
 948         } else if (starts_with(url, "rsync:")) {
 949                 die(_("git-over-rsync is no longer supported"));
 950         } else if (url_is_local_not_ssh(url) && is_file(url) && is_bundle(url, 1)) {
 951                 struct bundle_transport_data *data = xcalloc(1, sizeof(*data));
 952                 transport_check_allowed("file");
 953                 ret->data = data;
 954                 ret->vtable = &bundle_vtable;
 955                 ret->smart_options = NULL;
 956         } else if (!is_url(url)
 957                 || starts_with(url, "file://")
 958                 || starts_with(url, "git://")
 959                 || starts_with(url, "ssh://")
 960                 || starts_with(url, "git+ssh://") /* deprecated - do not use */
 961                 || starts_with(url, "ssh+git://") /* deprecated - do not use */
 962                 ) {
 963                 /*
 964                  * These are builtin smart transports; "allowed" transports
 965                  * will be checked individually in git_connect.
 966                  */
 967                 struct git_transport_data *data = xcalloc(1, sizeof(*data));
 968                 ret->data = data;
 969                 ret->vtable = &builtin_smart_vtable;
 970                 ret->smart_options = &(data->options);
 971
 972                 data->conn = NULL;
 973                 data->got_remote_heads = 0;
 974         } else {
 975                 /* Unknown protocol in URL. Pass to external handler. */
 976                 int len = external_specification_len(url);
 977                 char *handler = xmemdupz(url, len);
 978                 transport_helper_init(ret, handler);
 979         }
 980
 981         if (ret->smart_options) {
 982                 ret->smart_options->thin = 1;
 983                 ret->smart_options->uploadpack = "git-upload-pack";
 984                 if (remote->uploadpack)
 985                         ret->smart_options->uploadpack = remote->uploadpack;
 986                 ret->smart_options->receivepack = "git-receive-pack";
 987                 if (remote->receivepack)
 988                         ret->smart_options->receivepack = remote->receivepack;
 989         }
 990
 991         return ret;
 992 }
 993
 994 int transport_set_option(struct transport *transport,
 995                          const char *name, const char *value)
 996 {
 997         int git_reports = 1, protocol_reports = 1;
 998
 999         if (transport->smart_options)
1000                 git_reports = set_git_option(transport->smart_options,
1001                                              name, value);
1002
1003         if (transport->vtable->set_option)
1004                 protocol_reports = transport->vtable->set_option(transport,
1005                                                                  name, value);
1006
1007         /* If either report is 0, report 0 (success). */
1008         if (!git_reports || !protocol_reports)
1009                 return 0;
1010         /* If either reports -1 (invalid value), report -1. */
1011         if ((git_reports == -1) || (protocol_reports == -1))
1012                 return -1;
1013         /* Otherwise if both report unknown, report unknown. */
1014         return 1;
1015 }
1016
1017 void transport_set_verbosity(struct transport *transport, int verbosity,
1018         int force_progress)
1019 {
1020         if (verbosity >= 1)
1021                 transport->verbose = verbosity <= 3 ? verbosity : 3;
1022         if (verbosity < 0)
1023                 transport->verbose = -1;
1024
1025         /**
1026          * Rules used to determine whether to report progress (processing aborts
1027          * when a rule is satisfied):
1028          *
1029          *   . Report progress, if force_progress is 1 (ie. --progress).
1030          *   . Don't report progress, if force_progress is 0 (ie. --no-progress).
1031          *   . Don't report progress, if verbosity < 0 (ie. -q/--quiet ).
1032          *   . Report progress if isatty(2) is 1.
1033          **/
1034         if (force_progress >= 0)
1035                 transport->progress = !!force_progress;
1036         else
1037                 transport->progress = verbosity >= 0 && isatty(2);
1038 }
1039
1040 static void die_with_unpushed_submodules(struct string_list *needs_pushing)
1041 {
1042         int i;
1043
1044         fprintf(stderr, _("The following submodule paths contain changes that can\n"
1045                         "not be found on any remote:\n"));
1046         for (i = 0; i < needs_pushing->nr; i++)
1047                 fprintf(stderr, "  %s\n", needs_pushing->items[i].string);
1048         fprintf(stderr, _("\nPlease try\n\n"
1049                           "     git push --recurse-submodules=on-demand\n\n"
1050                           "or cd to the path and use\n\n"
1051                           "     git push\n\n"
1052                           "to push them to a remote.\n\n"));
1053
1054         string_list_clear(needs_pushing, 0);
1055
1056         die(_("Aborting."));
1057 }
1058
1059 static int run_pre_push_hook(struct transport *transport,
1060                              struct ref *remote_refs)
1061 {
1062         int ret = 0, x;
1063         struct ref *r;
1064         struct child_process proc = CHILD_PROCESS_INIT;
1065         struct strbuf buf;
1066         const char *argv[4];
1067
1068         if (!(argv[0] = find_hook("pre-push")))
1069                 return 0;
1070
1071         argv[1] = transport->remote->name;
1072         argv[2] = transport->url;
1073         argv[3] = NULL;
1074
1075         proc.argv = argv;
1076         proc.in = -1;
1077         proc.trace2_hook_name = "pre-push";
1078
1079         if (start_command(&proc)) {
1080                 finish_command(&proc);
1081                 return -1;
1082         }
1083
1084         sigchain_push(SIGPIPE, SIG_IGN);
1085
1086         strbuf_init(&buf, 256);
1087
1088         for (r = remote_refs; r; r = r->next) {
1089                 if (!r->peer_ref) continue;
1090                 if (r->status == REF_STATUS_REJECT_NONFASTFORWARD) continue;
1091                 if (r->status == REF_STATUS_REJECT_STALE) continue;
1092                 if (r->status == REF_STATUS_UPTODATE) continue;
1093
1094                 strbuf_reset(&buf);
1095                 strbuf_addf( &buf, "%s %s %s %s\n",
1096                          r->peer_ref->name, oid_to_hex(&r->new_oid),
1097                          r->name, oid_to_hex(&r->old_oid));
1098
1099                 if (write_in_full(proc.in, buf.buf, buf.len) < 0) {
1100                         /* We do not mind if a hook does not read all refs. */
1101                         if (errno != EPIPE)
1102                                 ret = -1;
1103                         break;
1104                 }
1105         }
1106
1107         strbuf_release(&buf);
1108
1109         x = close(proc.in);
1110         if (!ret)
1111                 ret = x;
1112
1113         sigchain_pop(SIGPIPE);
1114
1115         x = finish_command(&proc);
1116         if (!ret)
1117                 ret = x;
1118
1119         return ret;
1120 }
1121
1122 int transport_push(struct repository *r,
1123                    struct transport *transport,
1124                    struct refspec *rs, int flags,
1125                    unsigned int *reject_reasons)
1126 {
1127         *reject_reasons = 0;
1128
1129         if (transport_color_config() < 0)
1130                 return -1;
1131
1132         if (transport->vtable->push_refs) {
1133                 struct ref *remote_refs;
1134                 struct ref *local_refs = get_local_heads();
1135                 int match_flags = MATCH_REFS_NONE;
1136                 int verbose = (transport->verbose > 0);
1137                 int quiet = (transport->verbose < 0);
1138                 int porcelain = flags & TRANSPORT_PUSH_PORCELAIN;
1139                 int pretend = flags & TRANSPORT_PUSH_DRY_RUN;
1140                 int push_ret, ret, err;
1141                 struct argv_array ref_prefixes = ARGV_ARRAY_INIT;
1142
1143                 if (check_push_refs(local_refs, rs) < 0)
1144                         return -1;
1145
1146                 refspec_ref_prefixes(rs, &ref_prefixes);
1147
1148                 trace2_region_enter("transport_push", "get_refs_list", r);
1149                 remote_refs = transport->vtable->get_refs_list(transport, 1,
1150                                                                &ref_prefixes);
1151                 trace2_region_leave("transport_push", "get_refs_list", r);
1152
1153                 argv_array_clear(&ref_prefixes);
1154
1155                 if (flags & TRANSPORT_PUSH_ALL)
1156                         match_flags |= MATCH_REFS_ALL;
1157                 if (flags & TRANSPORT_PUSH_MIRROR)
1158                         match_flags |= MATCH_REFS_MIRROR;
1159                 if (flags & TRANSPORT_PUSH_PRUNE)
1160                         match_flags |= MATCH_REFS_PRUNE;
1161                 if (flags & TRANSPORT_PUSH_FOLLOW_TAGS)
1162                         match_flags |= MATCH_REFS_FOLLOW_TAGS;
1163
1164                 if (match_push_refs(local_refs, &remote_refs, rs, match_flags))
1165                         return -1;
1166
1167                 if (transport->smart_options &&
1168                     transport->smart_options->cas &&
1169                     !is_empty_cas(transport->smart_options->cas))
1170                         apply_push_cas(transport->smart_options->cas,
1171                                        transport->remote, remote_refs);
1172
1173                 set_ref_status_for_push(remote_refs,
1174                         flags & TRANSPORT_PUSH_MIRROR,
1175                         flags & TRANSPORT_PUSH_FORCE);
1176
1177                 if (!(flags & TRANSPORT_PUSH_NO_HOOK))
1178                         if (run_pre_push_hook(transport, remote_refs))
1179                                 return -1;
1180
1181                 if ((flags & (TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND |
1182                               TRANSPORT_RECURSE_SUBMODULES_ONLY)) &&
1183                     !is_bare_repository()) {
1184                         struct ref *ref = remote_refs;
1185                         struct oid_array commits = OID_ARRAY_INIT;
1186
1187                         trace2_region_enter("transport_push", "push_submodules", r);
1188                         for (; ref; ref = ref->next)
1189                                 if (!is_null_oid(&ref->new_oid))
1190                                         oid_array_append(&commits,
1191                                                           &ref->new_oid);
1192
1193                         if (!push_unpushed_submodules(r,
1194                                                       &commits,
1195                                                       transport->remote,
1196                                                       rs,
1197                                                       transport->push_options,
1198                                                       pretend)) {
1199                                 oid_array_clear(&commits);
1200                                 trace2_region_leave("transport_push", "push_submodules", r);
1201                                 die(_("failed to push all needed submodules"));
1202                         }
1203                         oid_array_clear(&commits);
1204                         trace2_region_leave("transport_push", "push_submodules", r);
1205                 }
1206
1207                 if (((flags & TRANSPORT_RECURSE_SUBMODULES_CHECK) ||
1208                      ((flags & (TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND |
1209                                 TRANSPORT_RECURSE_SUBMODULES_ONLY)) &&
1210                       !pretend)) && !is_bare_repository()) {
1211                         struct ref *ref = remote_refs;
1212                         struct string_list needs_pushing = STRING_LIST_INIT_DUP;
1213                         struct oid_array commits = OID_ARRAY_INIT;
1214
1215                         trace2_region_enter("transport_push", "check_submodules", r);
1216                         for (; ref; ref = ref->next)
1217                                 if (!is_null_oid(&ref->new_oid))
1218                                         oid_array_append(&commits,
1219                                                           &ref->new_oid);
1220
1221                         if (find_unpushed_submodules(r,
1222                                                      &commits,
1223                                                      transport->remote->name,
1224                                                      &needs_pushing)) {
1225                                 oid_array_clear(&commits);
1226                                 trace2_region_leave("transport_push", "check_submodules", r);
1227                                 die_with_unpushed_submodules(&needs_pushing);
1228                         }
1229                         string_list_clear(&needs_pushing, 0);
1230                         oid_array_clear(&commits);
1231                         trace2_region_leave("transport_push", "check_submodules", r);
1232                 }
1233
1234                 if (!(flags & TRANSPORT_RECURSE_SUBMODULES_ONLY)) {
1235                         trace2_region_enter("transport_push", "push_refs", r);
1236                         push_ret = transport->vtable->push_refs(transport, remote_refs, flags);
1237                         trace2_region_leave("transport_push", "push_refs", r);
1238                 } else
1239                         push_ret = 0;
1240                 err = push_had_errors(remote_refs);
1241                 ret = push_ret | err;
1242
1243                 if (!quiet || err)
1244                         transport_print_push_status(transport->url, remote_refs,
1245                                         verbose | porcelain, porcelain,
1246                                         reject_reasons);
1247
1248                 if (flags & TRANSPORT_PUSH_SET_UPSTREAM)
1249                         set_upstreams(transport, remote_refs, pretend);
1250
1251                 if (!(flags & (TRANSPORT_PUSH_DRY_RUN |
1252                                TRANSPORT_RECURSE_SUBMODULES_ONLY))) {
1253                         struct ref *ref;
1254                         for (ref = remote_refs; ref; ref = ref->next)
1255                                 transport_update_tracking_ref(transport->remote, ref, verbose);
1256                 }
1257
1258                 if (porcelain && !push_ret)
1259                         puts("Done");
1260                 else if (!quiet && !ret && !transport_refs_pushed(remote_refs))
1261                         fprintf(stderr, "Everything up-to-date\n");
1262
1263                 return ret;
1264         }
1265         return 1;
1266 }
1267
1268 const struct ref *transport_get_remote_refs(struct transport *transport,
1269                                             const struct argv_array *ref_prefixes)
1270 {
1271         if (!transport->got_remote_refs) {
1272                 transport->remote_refs =
1273                         transport->vtable->get_refs_list(transport, 0,
1274                                                          ref_prefixes);
1275                 transport->got_remote_refs = 1;
1276         }
1277
1278         return transport->remote_refs;
1279 }
1280
1281 int transport_fetch_refs(struct transport *transport, struct ref *refs)
1282 {
1283         int rc;
1284         int nr_heads = 0, nr_alloc = 0, nr_refs = 0;
1285         struct ref **heads = NULL;
1286         struct ref *rm;
1287
1288         for (rm = refs; rm; rm = rm->next) {
1289                 nr_refs++;
1290                 if (rm->peer_ref &&
1291                     !is_null_oid(&rm->old_oid) &&
1292                     oideq(&rm->peer_ref->old_oid, &rm->old_oid))
1293                         continue;
1294                 ALLOC_GROW(heads, nr_heads + 1, nr_alloc);
1295                 heads[nr_heads++] = rm;
1296         }
1297
1298         if (!nr_heads) {
1299                 /*
1300                  * When deepening of a shallow repository is requested,
1301                  * then local and remote refs are likely to still be equal.
1302                  * Just feed them all to the fetch method in that case.
1303                  * This condition shouldn't be met in a non-deepening fetch
1304                  * (see builtin/fetch.c:quickfetch()).
1305                  */
1306                 ALLOC_ARRAY(heads, nr_refs);
1307                 for (rm = refs; rm; rm = rm->next)
1308                         heads[nr_heads++] = rm;
1309         }
1310
1311         rc = transport->vtable->fetch(transport, nr_heads, heads);
1312
1313         free(heads);
1314         return rc;
1315 }
1316
1317 void transport_unlock_pack(struct transport *transport)
1318 {
1319         if (transport->pack_lockfile) {
1320                 unlink_or_warn(transport->pack_lockfile);
1321                 FREE_AND_NULL(transport->pack_lockfile);
1322         }
1323 }
1324
1325 int transport_connect(struct transport *transport, const char *name,
1326                       const char *exec, int fd[2])
1327 {
1328         if (transport->vtable->connect)
1329                 return transport->vtable->connect(transport, name, exec, fd);
1330         else
1331                 die(_("operation not supported by protocol"));
1332 }
1333
1334 int transport_disconnect(struct transport *transport)
1335 {
1336         int ret = 0;
1337         if (transport->vtable->disconnect)
1338                 ret = transport->vtable->disconnect(transport);
1339         free(transport);
1340         return ret;
1341 }
1342
1343 /*
1344  * Strip username (and password) from a URL and return
1345  * it in a newly allocated string.
1346  */
1347 char *transport_anonymize_url(const char *url)
1348 {
1349         char *scheme_prefix, *anon_part;
1350         size_t anon_len, prefix_len = 0;
1351
1352         anon_part = strchr(url, '@');
1353         if (url_is_local_not_ssh(url) || !anon_part)
1354                 goto literal_copy;
1355
1356         anon_len = strlen(++anon_part);
1357         scheme_prefix = strstr(url, "://");
1358         if (!scheme_prefix) {
1359                 if (!strchr(anon_part, ':'))
1360                         /* cannot be "me@there:/path/name" */
1361                         goto literal_copy;
1362         } else {
1363                 const char *cp;
1364                 /* make sure scheme is reasonable */
1365                 for (cp = url; cp < scheme_prefix; cp++) {
1366                         switch (*cp) {
1367                                 /* RFC 1738 2.1 */
1368                         case '+': case '.': case '-':
1369                                 break; /* ok */
1370                         default:
1371                                 if (isalnum(*cp))
1372                                         break;
1373                                 /* it isn't */
1374                                 goto literal_copy;
1375                         }
1376                 }
1377                 /* @ past the first slash does not count */
1378                 cp = strchr(scheme_prefix + 3, '/');
1379                 if (cp && cp < anon_part)
1380                         goto literal_copy;
1381                 prefix_len = scheme_prefix - url + 3;
1382         }
1383         return xstrfmt("%.*s%.*s", (int)prefix_len, url,
1384                        (int)anon_len, anon_part);
1385 literal_copy:
1386         return xstrdup(url);
1387 }