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 "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
 147         transport->hash_algo = data->header.hash_algo;
 148
 149         for (i = 0; i < data->header.references.nr; i++) {
 150                 struct ref_list_entry *e = data->header.references.list + i;
 151                 struct ref *ref = alloc_ref(e->name);
 152                 oidcpy(&ref->old_oid, &e->oid);
 153                 ref->next = result;
 154                 result = ref;
 155         }
 156         return result;
 157 }
 158
 159 static int fetch_refs_from_bundle(struct transport *transport,
 160                                int nr_heads, struct ref **to_fetch)
 161 {
 162         struct bundle_transport_data *data = transport->data;
 163         int ret;
 164
 165         if (!data->get_refs_from_bundle_called)
 166                 get_refs_from_bundle(transport, 0, NULL);
 167         ret = unbundle(the_repository, &data->header, data->fd,
 168                            transport->progress ? BUNDLE_VERBOSE : 0);
 169         transport->hash_algo = data->header.hash_algo;
 170         return ret;
 171 }
 172
 173 static int close_bundle(struct transport *transport)
 174 {
 175         struct bundle_transport_data *data = transport->data;
 176         if (data->fd > 0)
 177                 close(data->fd);
 178         free(data);
 179         return 0;
 180 }
 181
 182 struct git_transport_data {
 183         struct git_transport_options options;
 184         struct child_process *conn;
 185         int fd[2];
 186         unsigned got_remote_heads : 1;
 187         enum protocol_version version;
 188         struct oid_array extra_have;
 189         struct oid_array shallow;
 190 };
 191
 192 static int set_git_option(struct git_transport_options *opts,
 193                           const char *name, const char *value)
 194 {
 195         if (!strcmp(name, TRANS_OPT_UPLOADPACK)) {
 196                 opts->uploadpack = value;
 197                 return 0;
 198         } else if (!strcmp(name, TRANS_OPT_RECEIVEPACK)) {
 199                 opts->receivepack = value;
 200                 return 0;
 201         } else if (!strcmp(name, TRANS_OPT_THIN)) {
 202                 opts->thin = !!value;
 203                 return 0;
 204         } else if (!strcmp(name, TRANS_OPT_FOLLOWTAGS)) {
 205                 opts->followtags = !!value;
 206                 return 0;
 207         } else if (!strcmp(name, TRANS_OPT_KEEP)) {
 208                 opts->keep = !!value;
 209                 return 0;
 210         } else if (!strcmp(name, TRANS_OPT_UPDATE_SHALLOW)) {
 211                 opts->update_shallow = !!value;
 212                 return 0;
 213         } else if (!strcmp(name, TRANS_OPT_DEPTH)) {
 214                 if (!value)
 215                         opts->depth = 0;
 216                 else {
 217                         char *end;
 218                         opts->depth = strtol(value, &end, 0);
 219                         if (*end)
 220                                 die(_("transport: invalid depth option '%s'"), value);
 221                 }
 222                 return 0;
 223         } else if (!strcmp(name, TRANS_OPT_DEEPEN_SINCE)) {
 224                 opts->deepen_since = value;
 225                 return 0;
 226         } else if (!strcmp(name, TRANS_OPT_DEEPEN_NOT)) {
 227                 opts->deepen_not = (const struct string_list *)value;
 228                 return 0;
 229         } else if (!strcmp(name, TRANS_OPT_DEEPEN_RELATIVE)) {
 230                 opts->deepen_relative = !!value;
 231                 return 0;
 232         } else if (!strcmp(name, TRANS_OPT_FROM_PROMISOR)) {
 233                 opts->from_promisor = !!value;
 234                 return 0;
 235         } else if (!strcmp(name, TRANS_OPT_NO_DEPENDENTS)) {
 236                 opts->no_dependents = !!value;
 237                 return 0;
 238         } else if (!strcmp(name, TRANS_OPT_LIST_OBJECTS_FILTER)) {
 239                 list_objects_filter_die_if_populated(&opts->filter_options);
 240                 parse_list_objects_filter(&opts->filter_options, value);
 241                 return 0;
 242         }
 243         return 1;
 244 }
 245
 246 static int connect_setup(struct transport *transport, int for_push)
 247 {
 248         struct git_transport_data *data = transport->data;
 249         int flags = transport->verbose > 0 ? CONNECT_VERBOSE : 0;
 250
 251         if (data->conn)
 252                 return 0;
 253
 254         switch (transport->family) {
 255         case TRANSPORT_FAMILY_ALL: break;
 256         case TRANSPORT_FAMILY_IPV4: flags |= CONNECT_IPV4; break;
 257         case TRANSPORT_FAMILY_IPV6: flags |= CONNECT_IPV6; break;
 258         }
 259
 260         data->conn = git_connect(data->fd, transport->url,
 261                                  for_push ? data->options.receivepack :
 262                                  data->options.uploadpack,
 263                                  flags);
 264
 265         return 0;
 266 }
 267
 268 static void die_if_server_options(struct transport *transport)
 269 {
 270         if (!transport->server_options || !transport->server_options->nr)
 271                 return;
 272         advise(_("see protocol.version in 'git help config' for more details"));
 273         die(_("server options require protocol version 2 or later"));
 274 }
 275
 276 /*
 277  * Obtains the protocol version from the transport and writes it to
 278  * transport->data->version, first connecting if not already connected.
 279  *
 280  * If the protocol version is one that allows skipping the listing of remote
 281  * refs, and must_list_refs is 0, the listing of remote refs is skipped and
 282  * this function returns NULL. Otherwise, this function returns the list of
 283  * remote refs.
 284  */
 285 static struct ref *handshake(struct transport *transport, int for_push,
 286                              const struct argv_array *ref_prefixes,
 287                              int must_list_refs)
 288 {
 289         struct git_transport_data *data = transport->data;
 290         struct ref *refs = NULL;
 291         struct packet_reader reader;
 292
 293         connect_setup(transport, for_push);
 294
 295         packet_reader_init(&reader, data->fd[0], NULL, 0,
 296                            PACKET_READ_CHOMP_NEWLINE |
 297                            PACKET_READ_GENTLE_ON_EOF |
 298                            PACKET_READ_DIE_ON_ERR_PACKET);
 299
 300         data->version = discover_version(&reader);
 301         switch (data->version) {
 302         case protocol_v2:
 303                 if (must_list_refs)
 304                         get_remote_refs(data->fd[1], &reader, &refs, for_push,
 305                                         ref_prefixes,
 306                                         transport->server_options);
 307                 break;
 308         case protocol_v1:
 309         case protocol_v0:
 310                 die_if_server_options(transport);
 311                 get_remote_heads(&reader, &refs,
 312                                  for_push ? REF_NORMAL : 0,
 313                                  &data->extra_have,
 314                                  &data->shallow);
 315                 break;
 316         case protocol_unknown_version:
 317                 BUG("unknown protocol version");
 318         }
 319         data->got_remote_heads = 1;
 320         transport->hash_algo = reader.hash_algo;
 321
 322         if (reader.line_peeked)
 323                 BUG("buffer must be empty at the end of handshake()");
 324
 325         return refs;
 326 }
 327
 328 static struct ref *get_refs_via_connect(struct transport *transport, int for_push,
 329                                         const struct argv_array *ref_prefixes)
 330 {
 331         return handshake(transport, for_push, ref_prefixes, 1);
 332 }
 333
 334 static int fetch_refs_via_pack(struct transport *transport,
 335                                int nr_heads, struct ref **to_fetch)
 336 {
 337         int ret = 0;
 338         struct git_transport_data *data = transport->data;
 339         struct ref *refs = NULL;
 340         struct fetch_pack_args args;
 341         struct ref *refs_tmp = NULL;
 342
 343         memset(&args, 0, sizeof(args));
 344         args.uploadpack = data->options.uploadpack;
 345         args.keep_pack = data->options.keep;
 346         args.lock_pack = 1;
 347         args.use_thin_pack = data->options.thin;
 348         args.include_tag = data->options.followtags;
 349         args.verbose = (transport->verbose > 1);
 350         args.quiet = (transport->verbose < 0);
 351         args.no_progress = !transport->progress;
 352         args.depth = data->options.depth;
 353         args.deepen_since = data->options.deepen_since;
 354         args.deepen_not = data->options.deepen_not;
 355         args.deepen_relative = data->options.deepen_relative;
 356         args.check_self_contained_and_connected =
 357                 data->options.check_self_contained_and_connected;
 358         args.cloning = transport->cloning;
 359         args.update_shallow = data->options.update_shallow;
 360         args.from_promisor = data->options.from_promisor;
 361         args.no_dependents = data->options.no_dependents;
 362         args.filter_options = data->options.filter_options;
 363         args.stateless_rpc = transport->stateless_rpc;
 364         args.server_options = transport->server_options;
 365         args.negotiation_tips = data->options.negotiation_tips;
 366
 367         if (!data->got_remote_heads) {
 368                 int i;
 369                 int must_list_refs = 0;
 370                 for (i = 0; i < nr_heads; i++) {
 371                         if (!to_fetch[i]->exact_oid) {
 372                                 must_list_refs = 1;
 373                                 break;
 374                         }
 375                 }
 376                 refs_tmp = handshake(transport, 0, NULL, must_list_refs);
 377         }
 378
 379         switch (data->version) {
 380         case protocol_v2:
 381                 refs = fetch_pack(&args, data->fd,
 382                                   refs_tmp ? refs_tmp : transport->remote_refs,
 383                                   to_fetch, nr_heads, &data->shallow,
 384                                   &transport->pack_lockfile, data->version);
 385                 break;
 386         case protocol_v1:
 387         case protocol_v0:
 388                 die_if_server_options(transport);
 389                 refs = fetch_pack(&args, data->fd,
 390                                   refs_tmp ? refs_tmp : transport->remote_refs,
 391                                   to_fetch, nr_heads, &data->shallow,
 392                                   &transport->pack_lockfile, data->version);
 393                 break;
 394         case protocol_unknown_version:
 395                 BUG("unknown protocol version");
 396         }
 397
 398         close(data->fd[0]);
 399         close(data->fd[1]);
 400         if (finish_connect(data->conn))
 401                 ret = -1;
 402         data->conn = NULL;
 403         data->got_remote_heads = 0;
 404         data->options.self_contained_and_connected =
 405                 args.self_contained_and_connected;
 406         data->options.connectivity_checked = args.connectivity_checked;
 407
 408         if (refs == NULL)
 409                 ret = -1;
 410         if (report_unmatched_refs(to_fetch, nr_heads))
 411                 ret = -1;
 412
 413         free_refs(refs_tmp);
 414         free_refs(refs);
 415         return ret;
 416 }
 417
 418 static int push_had_errors(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                 case REF_STATUS_OK:
 425                         break;
 426                 default:
 427                         return 1;
 428                 }
 429         }
 430         return 0;
 431 }
 432
 433 int transport_refs_pushed(struct ref *ref)
 434 {
 435         for (; ref; ref = ref->next) {
 436                 switch(ref->status) {
 437                 case REF_STATUS_NONE:
 438                 case REF_STATUS_UPTODATE:
 439                         break;
 440                 default:
 441                         return 1;
 442                 }
 443         }
 444         return 0;
 445 }
 446
 447 void transport_update_tracking_ref(struct remote *remote, struct ref *ref, int verbose)
 448 {
 449         struct refspec_item rs;
 450
 451         if (ref->status != REF_STATUS_OK && ref->status != REF_STATUS_UPTODATE)
 452                 return;
 453
 454         rs.src = ref->name;
 455         rs.dst = NULL;
 456
 457         if (!remote_find_tracking(remote, &rs)) {
 458                 if (verbose)
 459                         fprintf(stderr, "updating local tracking ref '%s'\n", rs.dst);
 460                 if (ref->deletion) {
 461                         delete_ref(NULL, rs.dst, NULL, 0);
 462                 } else
 463                         update_ref("update by push", rs.dst, &ref->new_oid,
 464                                    NULL, 0, 0);
 465                 free(rs.dst);
 466         }
 467 }
 468
 469 static void print_ref_status(char flag, const char *summary,
 470                              struct ref *to, struct ref *from, const char *msg,
 471                              int porcelain, int summary_width)
 472 {
 473         if (porcelain) {
 474                 if (from)
 475                         fprintf(stdout, "%c\t%s:%s\t", flag, from->name, to->name);
 476                 else
 477                         fprintf(stdout, "%c\t:%s\t", flag, to->name);
 478                 if (msg)
 479                         fprintf(stdout, "%s (%s)\n", summary, msg);
 480                 else
 481                         fprintf(stdout, "%s\n", summary);
 482         } else {
 483                 const char *red = "", *reset = "";
 484                 if (push_had_errors(to)) {
 485                         red = transport_get_color(TRANSPORT_COLOR_REJECTED);
 486                         reset = transport_get_color(TRANSPORT_COLOR_RESET);
 487                 }
 488                 fprintf(stderr, " %s%c %-*s%s ", red, flag, summary_width,
 489                         summary, reset);
 490                 if (from)
 491                         fprintf(stderr, "%s -> %s", prettify_refname(from->name), prettify_refname(to->name));
 492                 else
 493                         fputs(prettify_refname(to->name), stderr);
 494                 if (msg) {
 495                         fputs(" (", stderr);
 496                         fputs(msg, stderr);
 497                         fputc(')', stderr);
 498                 }
 499                 fputc('\n', stderr);
 500         }
 501 }
 502
 503 static void print_ok_ref_status(struct ref *ref, int porcelain, int summary_width)
 504 {
 505         if (ref->deletion)
 506                 print_ref_status('-', "[deleted]", ref, NULL, NULL,
 507                                  porcelain, summary_width);
 508         else if (is_null_oid(&ref->old_oid))
 509                 print_ref_status('*',
 510                         (starts_with(ref->name, "refs/tags/") ? "[new tag]" :
 511                         "[new branch]"),
 512                         ref, ref->peer_ref, NULL, porcelain, summary_width);
 513         else {
 514                 struct strbuf quickref = STRBUF_INIT;
 515                 char type;
 516                 const char *msg;
 517
 518                 strbuf_add_unique_abbrev(&quickref, &ref->old_oid,
 519                                          DEFAULT_ABBREV);
 520                 if (ref->forced_update) {
 521                         strbuf_addstr(&quickref, "...");
 522                         type = '+';
 523                         msg = "forced update";
 524                 } else {
 525                         strbuf_addstr(&quickref, "..");
 526                         type = ' ';
 527                         msg = NULL;
 528                 }
 529                 strbuf_add_unique_abbrev(&quickref, &ref->new_oid,
 530                                          DEFAULT_ABBREV);
 531
 532                 print_ref_status(type, quickref.buf, ref, ref->peer_ref, msg,
 533                                  porcelain, summary_width);
 534                 strbuf_release(&quickref);
 535         }
 536 }
 537
 538 static int print_one_push_status(struct ref *ref, const char *dest, int count,
 539                                  int porcelain, int summary_width)
 540 {
 541         if (!count) {
 542                 char *url = transport_anonymize_url(dest);
 543                 fprintf(porcelain ? stdout : stderr, "To %s\n", url);
 544                 free(url);
 545         }
 546
 547         switch(ref->status) {
 548         case REF_STATUS_NONE:
 549                 print_ref_status('X', "[no match]", ref, NULL, NULL,
 550                                  porcelain, summary_width);
 551                 break;
 552         case REF_STATUS_REJECT_NODELETE:
 553                 print_ref_status('!', "[rejected]", ref, NULL,
 554                                  "remote does not support deleting refs",
 555                                  porcelain, summary_width);
 556                 break;
 557         case REF_STATUS_UPTODATE:
 558                 print_ref_status('=', "[up to date]", ref,
 559                                  ref->peer_ref, NULL, porcelain, summary_width);
 560                 break;
 561         case REF_STATUS_REJECT_NONFASTFORWARD:
 562                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 563                                  "non-fast-forward", porcelain, summary_width);
 564                 break;
 565         case REF_STATUS_REJECT_ALREADY_EXISTS:
 566                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 567                                  "already exists", porcelain, summary_width);
 568                 break;
 569         case REF_STATUS_REJECT_FETCH_FIRST:
 570                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 571                                  "fetch first", porcelain, summary_width);
 572                 break;
 573         case REF_STATUS_REJECT_NEEDS_FORCE:
 574                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 575                                  "needs force", porcelain, summary_width);
 576                 break;
 577         case REF_STATUS_REJECT_STALE:
 578                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 579                                  "stale info", porcelain, summary_width);
 580                 break;
 581         case REF_STATUS_REJECT_SHALLOW:
 582                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 583                                  "new shallow roots not allowed",
 584                                  porcelain, summary_width);
 585                 break;
 586         case REF_STATUS_REMOTE_REJECT:
 587                 print_ref_status('!', "[remote rejected]", ref,
 588                                  ref->deletion ? NULL : ref->peer_ref,
 589                                  ref->remote_status, porcelain, summary_width);
 590                 break;
 591         case REF_STATUS_EXPECTING_REPORT:
 592                 print_ref_status('!', "[remote failure]", ref,
 593                                  ref->deletion ? NULL : ref->peer_ref,
 594                                  "remote failed to report status",
 595                                  porcelain, summary_width);
 596                 break;
 597         case REF_STATUS_ATOMIC_PUSH_FAILED:
 598                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 599                                  "atomic push failed", porcelain, summary_width);
 600                 break;
 601         case REF_STATUS_OK:
 602                 print_ok_ref_status(ref, porcelain, summary_width);
 603                 break;
 604         }
 605
 606         return 1;
 607 }
 608
 609 static int measure_abbrev(const struct object_id *oid, int sofar)
 610 {
 611         char hex[GIT_MAX_HEXSZ + 1];
 612         int w = find_unique_abbrev_r(hex, oid, DEFAULT_ABBREV);
 613
 614         return (w < sofar) ? sofar : w;
 615 }
 616
 617 int transport_summary_width(const struct ref *refs)
 618 {
 619         int maxw = -1;
 620
 621         for (; refs; refs = refs->next) {
 622                 maxw = measure_abbrev(&refs->old_oid, maxw);
 623                 maxw = measure_abbrev(&refs->new_oid, maxw);
 624         }
 625         if (maxw < 0)
 626                 maxw = FALLBACK_DEFAULT_ABBREV;
 627         return (2 * maxw + 3);
 628 }
 629
 630 void transport_print_push_status(const char *dest, struct ref *refs,
 631                                   int verbose, int porcelain, unsigned int *reject_reasons)
 632 {
 633         struct ref *ref;
 634         int n = 0;
 635         char *head;
 636         int summary_width = transport_summary_width(refs);
 637
 638         if (transport_color_config() < 0)
 639                 warning(_("could not parse transport.color.* config"));
 640
 641         head = resolve_refdup("HEAD", RESOLVE_REF_READING, NULL, NULL);
 642
 643         if (verbose) {
 644                 for (ref = refs; ref; ref = ref->next)
 645                         if (ref->status == REF_STATUS_UPTODATE)
 646                                 n += print_one_push_status(ref, dest, n,
 647                                                            porcelain, summary_width);
 648         }
 649
 650         for (ref = refs; ref; ref = ref->next)
 651                 if (ref->status == REF_STATUS_OK)
 652                         n += print_one_push_status(ref, dest, n,
 653                                                    porcelain, summary_width);
 654
 655         *reject_reasons = 0;
 656         for (ref = refs; ref; ref = ref->next) {
 657                 if (ref->status != REF_STATUS_NONE &&
 658                     ref->status != REF_STATUS_UPTODATE &&
 659                     ref->status != REF_STATUS_OK)
 660                         n += print_one_push_status(ref, dest, n,
 661                                                    porcelain, summary_width);
 662                 if (ref->status == REF_STATUS_REJECT_NONFASTFORWARD) {
 663                         if (head != NULL && !strcmp(head, ref->name))
 664                                 *reject_reasons |= REJECT_NON_FF_HEAD;
 665                         else
 666                                 *reject_reasons |= REJECT_NON_FF_OTHER;
 667                 } else if (ref->status == REF_STATUS_REJECT_ALREADY_EXISTS) {
 668                         *reject_reasons |= REJECT_ALREADY_EXISTS;
 669                 } else if (ref->status == REF_STATUS_REJECT_FETCH_FIRST) {
 670                         *reject_reasons |= REJECT_FETCH_FIRST;
 671                 } else if (ref->status == REF_STATUS_REJECT_NEEDS_FORCE) {
 672                         *reject_reasons |= REJECT_NEEDS_FORCE;
 673                 }
 674         }
 675         free(head);
 676 }
 677
 678 static int git_transport_push(struct transport *transport, struct ref *remote_refs, int flags)
 679 {
 680         struct git_transport_data *data = transport->data;
 681         struct send_pack_args args;
 682         int ret = 0;
 683
 684         if (transport_color_config() < 0)
 685                 return -1;
 686
 687         if (!data->got_remote_heads)
 688                 get_refs_via_connect(transport, 1, NULL);
 689
 690         memset(&args, 0, sizeof(args));
 691         args.send_mirror = !!(flags & TRANSPORT_PUSH_MIRROR);
 692         args.force_update = !!(flags & TRANSPORT_PUSH_FORCE);
 693         args.use_thin_pack = data->options.thin;
 694         args.verbose = (transport->verbose > 0);
 695         args.quiet = (transport->verbose < 0);
 696         args.progress = transport->progress;
 697         args.dry_run = !!(flags & TRANSPORT_PUSH_DRY_RUN);
 698         args.porcelain = !!(flags & TRANSPORT_PUSH_PORCELAIN);
 699         args.atomic = !!(flags & TRANSPORT_PUSH_ATOMIC);
 700         args.push_options = transport->push_options;
 701         args.url = transport->url;
 702
 703         if (flags & TRANSPORT_PUSH_CERT_ALWAYS)
 704                 args.push_cert = SEND_PACK_PUSH_CERT_ALWAYS;
 705         else if (flags & TRANSPORT_PUSH_CERT_IF_ASKED)
 706                 args.push_cert = SEND_PACK_PUSH_CERT_IF_ASKED;
 707         else
 708                 args.push_cert = SEND_PACK_PUSH_CERT_NEVER;
 709
 710         switch (data->version) {
 711         case protocol_v2:
 712                 die(_("support for protocol v2 not implemented yet"));
 713                 break;
 714         case protocol_v1:
 715         case protocol_v0:
 716                 ret = send_pack(&args, data->fd, data->conn, remote_refs,
 717                                 &data->extra_have);
 718                 break;
 719         case protocol_unknown_version:
 720                 BUG("unknown protocol version");
 721         }
 722
 723         close(data->fd[1]);
 724         close(data->fd[0]);
 725         /*
 726          * Atomic push may abort the connection early and close the pipe,
 727          * which may cause an error for `finish_connect()`. Ignore this error
 728          * for atomic git-push.
 729          */
 730         if (ret || args.atomic)
 731                 finish_connect(data->conn);
 732         else
 733                 ret = finish_connect(data->conn);
 734         data->conn = NULL;
 735         data->got_remote_heads = 0;
 736
 737         return ret;
 738 }
 739
 740 static int connect_git(struct transport *transport, const char *name,
 741                        const char *executable, int fd[2])
 742 {
 743         struct git_transport_data *data = transport->data;
 744         data->conn = git_connect(data->fd, transport->url,
 745                                  executable, 0);
 746         fd[0] = data->fd[0];
 747         fd[1] = data->fd[1];
 748         return 0;
 749 }
 750
 751 static int disconnect_git(struct transport *transport)
 752 {
 753         struct git_transport_data *data = transport->data;
 754         if (data->conn) {
 755                 if (data->got_remote_heads && !transport->stateless_rpc)
 756                         packet_flush(data->fd[1]);
 757                 close(data->fd[0]);
 758                 close(data->fd[1]);
 759                 finish_connect(data->conn);
 760         }
 761
 762         free(data);
 763         return 0;
 764 }
 765
 766 static struct transport_vtable taken_over_vtable = {
 767         NULL,
 768         get_refs_via_connect,
 769         fetch_refs_via_pack,
 770         git_transport_push,
 771         NULL,
 772         disconnect_git
 773 };
 774
 775 void transport_take_over(struct transport *transport,
 776                          struct child_process *child)
 777 {
 778         struct git_transport_data *data;
 779
 780         if (!transport->smart_options)
 781                 BUG("taking over transport requires non-NULL "
 782                     "smart_options field.");
 783
 784         data = xcalloc(1, sizeof(*data));
 785         data->options = *transport->smart_options;
 786         data->conn = child;
 787         data->fd[0] = data->conn->out;
 788         data->fd[1] = data->conn->in;
 789         data->got_remote_heads = 0;
 790         transport->data = data;
 791
 792         transport->vtable = &taken_over_vtable;
 793         transport->smart_options = &(data->options);
 794
 795         transport->cannot_reuse = 1;
 796 }
 797
 798 static int is_file(const char *url)
 799 {
 800         struct stat buf;
 801         if (stat(url, &buf))
 802                 return 0;
 803         return S_ISREG(buf.st_mode);
 804 }
 805
 806 static int external_specification_len(const char *url)
 807 {
 808         return strchr(url, ':') - url;
 809 }
 810
 811 static const struct string_list *protocol_whitelist(void)
 812 {
 813         static int enabled = -1;
 814         static struct string_list allowed = STRING_LIST_INIT_DUP;
 815
 816         if (enabled < 0) {
 817                 const char *v = getenv("GIT_ALLOW_PROTOCOL");
 818                 if (v) {
 819                         string_list_split(&allowed, v, ':', -1);
 820                         string_list_sort(&allowed);
 821                         enabled = 1;
 822                 } else {
 823                         enabled = 0;
 824                 }
 825         }
 826
 827         return enabled ? &allowed : NULL;
 828 }
 829
 830 enum protocol_allow_config {
 831         PROTOCOL_ALLOW_NEVER = 0,
 832         PROTOCOL_ALLOW_USER_ONLY,
 833         PROTOCOL_ALLOW_ALWAYS
 834 };
 835
 836 static enum protocol_allow_config parse_protocol_config(const char *key,
 837                                                         const char *value)
 838 {
 839         if (!strcasecmp(value, "always"))
 840                 return PROTOCOL_ALLOW_ALWAYS;
 841         else if (!strcasecmp(value, "never"))
 842                 return PROTOCOL_ALLOW_NEVER;
 843         else if (!strcasecmp(value, "user"))
 844                 return PROTOCOL_ALLOW_USER_ONLY;
 845
 846         die(_("unknown value for config '%s': %s"), key, value);
 847 }
 848
 849 static enum protocol_allow_config get_protocol_config(const char *type)
 850 {
 851         char *key = xstrfmt("protocol.%s.allow", type);
 852         char *value;
 853
 854         /* first check the per-protocol config */
 855         if (!git_config_get_string(key, &value)) {
 856                 enum protocol_allow_config ret =
 857                         parse_protocol_config(key, value);
 858                 free(key);
 859                 free(value);
 860                 return ret;
 861         }
 862         free(key);
 863
 864         /* if defined, fallback to user-defined default for unknown protocols */
 865         if (!git_config_get_string("protocol.allow", &value)) {
 866                 enum protocol_allow_config ret =
 867                         parse_protocol_config("protocol.allow", value);
 868                 free(value);
 869                 return ret;
 870         }
 871
 872         /* fallback to built-in defaults */
 873         /* known safe */
 874         if (!strcmp(type, "http") ||
 875             !strcmp(type, "https") ||
 876             !strcmp(type, "git") ||
 877             !strcmp(type, "ssh") ||
 878             !strcmp(type, "file"))
 879                 return PROTOCOL_ALLOW_ALWAYS;
 880
 881         /* known scary; err on the side of caution */
 882         if (!strcmp(type, "ext"))
 883                 return PROTOCOL_ALLOW_NEVER;
 884
 885         /* unknown; by default let them be used only directly by the user */
 886         return PROTOCOL_ALLOW_USER_ONLY;
 887 }
 888
 889 int is_transport_allowed(const char *type, int from_user)
 890 {
 891         const struct string_list *whitelist = protocol_whitelist();
 892         if (whitelist)
 893                 return string_list_has_string(whitelist, type);
 894
 895         switch (get_protocol_config(type)) {
 896         case PROTOCOL_ALLOW_ALWAYS:
 897                 return 1;
 898         case PROTOCOL_ALLOW_NEVER:
 899                 return 0;
 900         case PROTOCOL_ALLOW_USER_ONLY:
 901                 if (from_user < 0)
 902                         from_user = git_env_bool("GIT_PROTOCOL_FROM_USER", 1);
 903                 return from_user;
 904         }
 905
 906         BUG("invalid protocol_allow_config type");
 907 }
 908
 909 void transport_check_allowed(const char *type)
 910 {
 911         if (!is_transport_allowed(type, -1))
 912                 die(_("transport '%s' not allowed"), type);
 913 }
 914
 915 static struct transport_vtable bundle_vtable = {
 916         NULL,
 917         get_refs_from_bundle,
 918         fetch_refs_from_bundle,
 919         NULL,
 920         NULL,
 921         close_bundle
 922 };
 923
 924 static struct transport_vtable builtin_smart_vtable = {
 925         NULL,
 926         get_refs_via_connect,
 927         fetch_refs_via_pack,
 928         git_transport_push,
 929         connect_git,
 930         disconnect_git
 931 };
 932
 933 struct transport *transport_get(struct remote *remote, const char *url)
 934 {
 935         const char *helper;
 936         struct transport *ret = xcalloc(1, sizeof(*ret));
 937
 938         ret->progress = isatty(2);
 939
 940         if (!remote)
 941                 BUG("No remote provided to transport_get()");
 942
 943         ret->got_remote_refs = 0;
 944         ret->remote = remote;
 945         helper = remote->foreign_vcs;
 946
 947         if (!url && remote->url)
 948                 url = remote->url[0];
 949         ret->url = url;
 950
 951         /* maybe it is a foreign URL? */
 952         if (url) {
 953                 const char *p = url;
 954
 955                 while (is_urlschemechar(p == url, *p))
 956                         p++;
 957                 if (starts_with(p, "::"))
 958                         helper = xstrndup(url, p - url);
 959         }
 960
 961         if (helper) {
 962                 transport_helper_init(ret, helper);
 963         } else if (starts_with(url, "rsync:")) {
 964                 die(_("git-over-rsync is no longer supported"));
 965         } else if (url_is_local_not_ssh(url) && is_file(url) && is_bundle(url, 1)) {
 966                 struct bundle_transport_data *data = xcalloc(1, sizeof(*data));
 967                 transport_check_allowed("file");
 968                 ret->data = data;
 969                 ret->vtable = &bundle_vtable;
 970                 ret->smart_options = NULL;
 971         } else if (!is_url(url)
 972                 || starts_with(url, "file://")
 973                 || starts_with(url, "git://")
 974                 || starts_with(url, "ssh://")
 975                 || starts_with(url, "git+ssh://") /* deprecated - do not use */
 976                 || starts_with(url, "ssh+git://") /* deprecated - do not use */
 977                 ) {
 978                 /*
 979                  * These are builtin smart transports; "allowed" transports
 980                  * will be checked individually in git_connect.
 981                  */
 982                 struct git_transport_data *data = xcalloc(1, sizeof(*data));
 983                 ret->data = data;
 984                 ret->vtable = &builtin_smart_vtable;
 985                 ret->smart_options = &(data->options);
 986
 987                 data->conn = NULL;
 988                 data->got_remote_heads = 0;
 989         } else {
 990                 /* Unknown protocol in URL. Pass to external handler. */
 991                 int len = external_specification_len(url);
 992                 char *handler = xmemdupz(url, len);
 993                 transport_helper_init(ret, handler);
 994         }
 995
 996         if (ret->smart_options) {
 997                 ret->smart_options->thin = 1;
 998                 ret->smart_options->uploadpack = "git-upload-pack";
 999                 if (remote->uploadpack)
1000                         ret->smart_options->uploadpack = remote->uploadpack;
1001                 ret->smart_options->receivepack = "git-receive-pack";
1002                 if (remote->receivepack)
1003                         ret->smart_options->receivepack = remote->receivepack;
1004         }
1005
1006         ret->hash_algo = &hash_algos[GIT_HASH_SHA1];
1007
1008         return ret;
1009 }
1010
1011 const struct git_hash_algo *transport_get_hash_algo(struct transport *transport)
1012 {
1013         return transport->hash_algo;
1014 }
1015
1016 int transport_set_option(struct transport *transport,
1017                          const char *name, const char *value)
1018 {
1019         int git_reports = 1, protocol_reports = 1;
1020
1021         if (transport->smart_options)
1022                 git_reports = set_git_option(transport->smart_options,
1023                                              name, value);
1024
1025         if (transport->vtable->set_option)
1026                 protocol_reports = transport->vtable->set_option(transport,
1027                                                                  name, value);
1028
1029         /* If either report is 0, report 0 (success). */
1030         if (!git_reports || !protocol_reports)
1031                 return 0;
1032         /* If either reports -1 (invalid value), report -1. */
1033         if ((git_reports == -1) || (protocol_reports == -1))
1034                 return -1;
1035         /* Otherwise if both report unknown, report unknown. */
1036         return 1;
1037 }
1038
1039 void transport_set_verbosity(struct transport *transport, int verbosity,
1040         int force_progress)
1041 {
1042         if (verbosity >= 1)
1043                 transport->verbose = verbosity <= 3 ? verbosity : 3;
1044         if (verbosity < 0)
1045                 transport->verbose = -1;
1046
1047         /**
1048          * Rules used to determine whether to report progress (processing aborts
1049          * when a rule is satisfied):
1050          *
1051          *   . Report progress, if force_progress is 1 (ie. --progress).
1052          *   . Don't report progress, if force_progress is 0 (ie. --no-progress).
1053          *   . Don't report progress, if verbosity < 0 (ie. -q/--quiet ).
1054          *   . Report progress if isatty(2) is 1.
1055          **/
1056         if (force_progress >= 0)
1057                 transport->progress = !!force_progress;
1058         else
1059                 transport->progress = verbosity >= 0 && isatty(2);
1060 }
1061
1062 static void die_with_unpushed_submodules(struct string_list *needs_pushing)
1063 {
1064         int i;
1065
1066         fprintf(stderr, _("The following submodule paths contain changes that can\n"
1067                         "not be found on any remote:\n"));
1068         for (i = 0; i < needs_pushing->nr; i++)
1069                 fprintf(stderr, "  %s\n", needs_pushing->items[i].string);
1070         fprintf(stderr, _("\nPlease try\n\n"
1071                           "     git push --recurse-submodules=on-demand\n\n"
1072                           "or cd to the path and use\n\n"
1073                           "     git push\n\n"
1074                           "to push them to a remote.\n\n"));
1075
1076         string_list_clear(needs_pushing, 0);
1077
1078         die(_("Aborting."));
1079 }
1080
1081 static int run_pre_push_hook(struct transport *transport,
1082                              struct ref *remote_refs)
1083 {
1084         int ret = 0, x;
1085         struct ref *r;
1086         struct child_process proc = CHILD_PROCESS_INIT;
1087         struct strbuf buf;
1088         const char *argv[4];
1089
1090         if (!(argv[0] = find_hook("pre-push")))
1091                 return 0;
1092
1093         argv[1] = transport->remote->name;
1094         argv[2] = transport->url;
1095         argv[3] = NULL;
1096
1097         proc.argv = argv;
1098         proc.in = -1;
1099         proc.trace2_hook_name = "pre-push";
1100
1101         if (start_command(&proc)) {
1102                 finish_command(&proc);
1103                 return -1;
1104         }
1105
1106         sigchain_push(SIGPIPE, SIG_IGN);
1107
1108         strbuf_init(&buf, 256);
1109
1110         for (r = remote_refs; r; r = r->next) {
1111                 if (!r->peer_ref) continue;
1112                 if (r->status == REF_STATUS_REJECT_NONFASTFORWARD) continue;
1113                 if (r->status == REF_STATUS_REJECT_STALE) continue;
1114                 if (r->status == REF_STATUS_UPTODATE) continue;
1115
1116                 strbuf_reset(&buf);
1117                 strbuf_addf( &buf, "%s %s %s %s\n",
1118                          r->peer_ref->name, oid_to_hex(&r->new_oid),
1119                          r->name, oid_to_hex(&r->old_oid));
1120
1121                 if (write_in_full(proc.in, buf.buf, buf.len) < 0) {
1122                         /* We do not mind if a hook does not read all refs. */
1123                         if (errno != EPIPE)
1124                                 ret = -1;
1125                         break;
1126                 }
1127         }
1128
1129         strbuf_release(&buf);
1130
1131         x = close(proc.in);
1132         if (!ret)
1133                 ret = x;
1134
1135         sigchain_pop(SIGPIPE);
1136
1137         x = finish_command(&proc);
1138         if (!ret)
1139                 ret = x;
1140
1141         return ret;
1142 }
1143
1144 int transport_push(struct repository *r,
1145                    struct transport *transport,
1146                    struct refspec *rs, int flags,
1147                    unsigned int *reject_reasons)
1148 {
1149         *reject_reasons = 0;
1150
1151         if (transport_color_config() < 0)
1152                 return -1;
1153
1154         if (transport->vtable->push_refs) {
1155                 struct ref *remote_refs;
1156                 struct ref *local_refs = get_local_heads();
1157                 int match_flags = MATCH_REFS_NONE;
1158                 int verbose = (transport->verbose > 0);
1159                 int quiet = (transport->verbose < 0);
1160                 int porcelain = flags & TRANSPORT_PUSH_PORCELAIN;
1161                 int pretend = flags & TRANSPORT_PUSH_DRY_RUN;
1162                 int push_ret, ret, err;
1163                 struct argv_array ref_prefixes = ARGV_ARRAY_INIT;
1164
1165                 if (check_push_refs(local_refs, rs) < 0)
1166                         return -1;
1167
1168                 refspec_ref_prefixes(rs, &ref_prefixes);
1169
1170                 trace2_region_enter("transport_push", "get_refs_list", r);
1171                 remote_refs = transport->vtable->get_refs_list(transport, 1,
1172                                                                &ref_prefixes);
1173                 trace2_region_leave("transport_push", "get_refs_list", r);
1174
1175                 argv_array_clear(&ref_prefixes);
1176
1177                 if (flags & TRANSPORT_PUSH_ALL)
1178                         match_flags |= MATCH_REFS_ALL;
1179                 if (flags & TRANSPORT_PUSH_MIRROR)
1180                         match_flags |= MATCH_REFS_MIRROR;
1181                 if (flags & TRANSPORT_PUSH_PRUNE)
1182                         match_flags |= MATCH_REFS_PRUNE;
1183                 if (flags & TRANSPORT_PUSH_FOLLOW_TAGS)
1184                         match_flags |= MATCH_REFS_FOLLOW_TAGS;
1185
1186                 if (match_push_refs(local_refs, &remote_refs, rs, match_flags))
1187                         return -1;
1188
1189                 if (transport->smart_options &&
1190                     transport->smart_options->cas &&
1191                     !is_empty_cas(transport->smart_options->cas))
1192                         apply_push_cas(transport->smart_options->cas,
1193                                        transport->remote, remote_refs);
1194
1195                 set_ref_status_for_push(remote_refs,
1196                         flags & TRANSPORT_PUSH_MIRROR,
1197                         flags & TRANSPORT_PUSH_FORCE);
1198
1199                 if (!(flags & TRANSPORT_PUSH_NO_HOOK))
1200                         if (run_pre_push_hook(transport, remote_refs))
1201                                 return -1;
1202
1203                 if ((flags & (TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND |
1204                               TRANSPORT_RECURSE_SUBMODULES_ONLY)) &&
1205                     !is_bare_repository()) {
1206                         struct ref *ref = remote_refs;
1207                         struct oid_array commits = OID_ARRAY_INIT;
1208
1209                         trace2_region_enter("transport_push", "push_submodules", r);
1210                         for (; ref; ref = ref->next)
1211                                 if (!is_null_oid(&ref->new_oid))
1212                                         oid_array_append(&commits,
1213                                                           &ref->new_oid);
1214
1215                         if (!push_unpushed_submodules(r,
1216                                                       &commits,
1217                                                       transport->remote,
1218                                                       rs,
1219                                                       transport->push_options,
1220                                                       pretend)) {
1221                                 oid_array_clear(&commits);
1222                                 trace2_region_leave("transport_push", "push_submodules", r);
1223                                 die(_("failed to push all needed submodules"));
1224                         }
1225                         oid_array_clear(&commits);
1226                         trace2_region_leave("transport_push", "push_submodules", r);
1227                 }
1228
1229                 if (((flags & TRANSPORT_RECURSE_SUBMODULES_CHECK) ||
1230                      ((flags & (TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND |
1231                                 TRANSPORT_RECURSE_SUBMODULES_ONLY)) &&
1232                       !pretend)) && !is_bare_repository()) {
1233                         struct ref *ref = remote_refs;
1234                         struct string_list needs_pushing = STRING_LIST_INIT_DUP;
1235                         struct oid_array commits = OID_ARRAY_INIT;
1236
1237                         trace2_region_enter("transport_push", "check_submodules", r);
1238                         for (; ref; ref = ref->next)
1239                                 if (!is_null_oid(&ref->new_oid))
1240                                         oid_array_append(&commits,
1241                                                           &ref->new_oid);
1242
1243                         if (find_unpushed_submodules(r,
1244                                                      &commits,
1245                                                      transport->remote->name,
1246                                                      &needs_pushing)) {
1247                                 oid_array_clear(&commits);
1248                                 trace2_region_leave("transport_push", "check_submodules", r);
1249                                 die_with_unpushed_submodules(&needs_pushing);
1250                         }
1251                         string_list_clear(&needs_pushing, 0);
1252                         oid_array_clear(&commits);
1253                         trace2_region_leave("transport_push", "check_submodules", r);
1254                 }
1255
1256                 if (!(flags & TRANSPORT_RECURSE_SUBMODULES_ONLY)) {
1257                         trace2_region_enter("transport_push", "push_refs", r);
1258                         push_ret = transport->vtable->push_refs(transport, remote_refs, flags);
1259                         trace2_region_leave("transport_push", "push_refs", r);
1260                 } else
1261                         push_ret = 0;
1262                 err = push_had_errors(remote_refs);
1263                 ret = push_ret | err;
1264
1265                 if (!quiet || err)
1266                         transport_print_push_status(transport->url, remote_refs,
1267                                         verbose | porcelain, porcelain,
1268                                         reject_reasons);
1269
1270                 if (flags & TRANSPORT_PUSH_SET_UPSTREAM)
1271                         set_upstreams(transport, remote_refs, pretend);
1272
1273                 if (!(flags & (TRANSPORT_PUSH_DRY_RUN |
1274                                TRANSPORT_RECURSE_SUBMODULES_ONLY))) {
1275                         struct ref *ref;
1276                         for (ref = remote_refs; ref; ref = ref->next)
1277                                 transport_update_tracking_ref(transport->remote, ref, verbose);
1278                 }
1279
1280                 if (porcelain && !push_ret)
1281                         puts("Done");
1282                 else if (!quiet && !ret && !transport_refs_pushed(remote_refs))
1283                         fprintf(stderr, "Everything up-to-date\n");
1284
1285                 return ret;
1286         }
1287         return 1;
1288 }
1289
1290 const struct ref *transport_get_remote_refs(struct transport *transport,
1291                                             const struct argv_array *ref_prefixes)
1292 {
1293         if (!transport->got_remote_refs) {
1294                 transport->remote_refs =
1295                         transport->vtable->get_refs_list(transport, 0,
1296                                                          ref_prefixes);
1297                 transport->got_remote_refs = 1;
1298         }
1299
1300         return transport->remote_refs;
1301 }
1302
1303 int transport_fetch_refs(struct transport *transport, struct ref *refs)
1304 {
1305         int rc;
1306         int nr_heads = 0, nr_alloc = 0, nr_refs = 0;
1307         struct ref **heads = NULL;
1308         struct ref *rm;
1309
1310         for (rm = refs; rm; rm = rm->next) {
1311                 nr_refs++;
1312                 if (rm->peer_ref &&
1313                     !is_null_oid(&rm->old_oid) &&
1314                     oideq(&rm->peer_ref->old_oid, &rm->old_oid))
1315                         continue;
1316                 ALLOC_GROW(heads, nr_heads + 1, nr_alloc);
1317                 heads[nr_heads++] = rm;
1318         }
1319
1320         if (!nr_heads) {
1321                 /*
1322                  * When deepening of a shallow repository is requested,
1323                  * then local and remote refs are likely to still be equal.
1324                  * Just feed them all to the fetch method in that case.
1325                  * This condition shouldn't be met in a non-deepening fetch
1326                  * (see builtin/fetch.c:quickfetch()).
1327                  */
1328                 ALLOC_ARRAY(heads, nr_refs);
1329                 for (rm = refs; rm; rm = rm->next)
1330                         heads[nr_heads++] = rm;
1331         }
1332
1333         rc = transport->vtable->fetch(transport, nr_heads, heads);
1334
1335         free(heads);
1336         return rc;
1337 }
1338
1339 void transport_unlock_pack(struct transport *transport)
1340 {
1341         if (transport->pack_lockfile) {
1342                 unlink_or_warn(transport->pack_lockfile);
1343                 FREE_AND_NULL(transport->pack_lockfile);
1344         }
1345 }
1346
1347 int transport_connect(struct transport *transport, const char *name,
1348                       const char *exec, int fd[2])
1349 {
1350         if (transport->vtable->connect)
1351                 return transport->vtable->connect(transport, name, exec, fd);
1352         else
1353                 die(_("operation not supported by protocol"));
1354 }
1355
1356 int transport_disconnect(struct transport *transport)
1357 {
1358         int ret = 0;
1359         if (transport->vtable->disconnect)
1360                 ret = transport->vtable->disconnect(transport);
1361         free(transport);
1362         return ret;
1363 }
1364
1365 /*
1366  * Strip username (and password) from a URL and return
1367  * it in a newly allocated string.
1368  */
1369 char *transport_anonymize_url(const char *url)
1370 {
1371         char *scheme_prefix, *anon_part;
1372         size_t anon_len, prefix_len = 0;
1373
1374         anon_part = strchr(url, '@');
1375         if (url_is_local_not_ssh(url) || !anon_part)
1376                 goto literal_copy;
1377
1378         anon_len = strlen(++anon_part);
1379         scheme_prefix = strstr(url, "://");
1380         if (!scheme_prefix) {
1381                 if (!strchr(anon_part, ':'))
1382                         /* cannot be "me@there:/path/name" */
1383                         goto literal_copy;
1384         } else {
1385                 const char *cp;
1386                 /* make sure scheme is reasonable */
1387                 for (cp = url; cp < scheme_prefix; cp++) {
1388                         switch (*cp) {
1389                                 /* RFC 1738 2.1 */
1390                         case '+': case '.': case '-':
1391                                 break; /* ok */
1392                         default:
1393                                 if (isalnum(*cp))
1394                                         break;
1395                                 /* it isn't */
1396                                 goto literal_copy;
1397                         }
1398                 }
1399                 /* @ past the first slash does not count */
1400                 cp = strchr(scheme_prefix + 3, '/');
1401                 if (cp && cp < anon_part)
1402                         goto literal_copy;
1403                 prefix_len = scheme_prefix - url + 3;
1404         }
1405         return xstrfmt("%.*s%.*s", (int)prefix_len, url,
1406                        (int)anon_len, anon_part);
1407 literal_copy:
1408         return xstrdup(url);
1409 }