git.oblomov.eu Git - git/blob - transport.c

   1 #include "cache.h"
   2 #include "config.h"
   3 #include "transport.h"
   4 #include "run-command.h"
   5 #include "pkt-line.h"
   6 #include "fetch-pack.h"
   7 #include "remote.h"
   8 #include "connect.h"
   9 #include "send-pack.h"
  10 #include "walker.h"
  11 #include "bundle.h"
  12 #include "dir.h"
  13 #include "refs.h"
  14 #include "branch.h"
  15 #include "url.h"
  16 #include "submodule.h"
  17 #include "string-list.h"
  18 #include "sha1-array.h"
  19 #include "sigchain.h"
  20 #include "transport-internal.h"
  21 #include "protocol.h"
  22 #include "object-store.h"
  23 #include "color.h"
  24
  25 static int transport_use_color = -1;
  26 static char transport_colors[][COLOR_MAXLEN] = {
  27         GIT_COLOR_RESET,
  28         GIT_COLOR_RED           /* REJECTED */
  29 };
  30
  31 enum color_transport {
  32         TRANSPORT_COLOR_RESET = 0,
  33         TRANSPORT_COLOR_REJECTED = 1
  34 };
  35
  36 static int transport_color_config(void)
  37 {
  38         const char *keys[] = {
  39                 "color.transport.reset",
  40                 "color.transport.rejected"
  41         }, *key = "color.transport";
  42         char *value;
  43         int i;
  44         static int initialized;
  45
  46         if (initialized)
  47                 return 0;
  48         initialized = 1;
  49
  50         if (!git_config_get_string(key, &value))
  51                 transport_use_color = git_config_colorbool(key, value);
  52
  53         if (!want_color_stderr(transport_use_color))
  54                 return 0;
  55
  56         for (i = 0; i < ARRAY_SIZE(keys); i++)
  57                 if (!git_config_get_string(keys[i], &value)) {
  58                         if (!value)
  59                                 return config_error_nonbool(keys[i]);
  60                         if (color_parse(value, transport_colors[i]) < 0)
  61                                 return -1;
  62                 }
  63
  64         return 0;
  65 }
  66
  67 static const char *transport_get_color(enum color_transport ix)
  68 {
  69         if (want_color_stderr(transport_use_color))
  70                 return transport_colors[ix];
  71         return "";
  72 }
  73
  74 static void set_upstreams(struct transport *transport, struct ref *refs,
  75         int pretend)
  76 {
  77         struct ref *ref;
  78         for (ref = refs; ref; ref = ref->next) {
  79                 const char *localname;
  80                 const char *tmp;
  81                 const char *remotename;
  82                 int flag = 0;
  83                 /*
  84                  * Check suitability for tracking. Must be successful /
  85                  * already up-to-date ref create/modify (not delete).
  86                  */
  87                 if (ref->status != REF_STATUS_OK &&
  88                         ref->status != REF_STATUS_UPTODATE)
  89                         continue;
  90                 if (!ref->peer_ref)
  91                         continue;
  92                 if (is_null_oid(&ref->new_oid))
  93                         continue;
  94
  95                 /* Follow symbolic refs (mainly for HEAD). */
  96                 localname = ref->peer_ref->name;
  97                 remotename = ref->name;
  98                 tmp = resolve_ref_unsafe(localname, RESOLVE_REF_READING,
  99                                          NULL, &flag);
 100                 if (tmp && flag & REF_ISSYMREF &&
 101                         starts_with(tmp, "refs/heads/"))
 102                         localname = tmp;
 103
 104                 /* Both source and destination must be local branches. */
 105                 if (!localname || !starts_with(localname, "refs/heads/"))
 106                         continue;
 107                 if (!remotename || !starts_with(remotename, "refs/heads/"))
 108                         continue;
 109
 110                 if (!pretend)
 111                         install_branch_config(BRANCH_CONFIG_VERBOSE,
 112                                 localname + 11, transport->remote->name,
 113                                 remotename);
 114                 else
 115                         printf(_("Would set upstream of '%s' to '%s' of '%s'\n"),
 116                                 localname + 11, remotename + 11,
 117                                 transport->remote->name);
 118         }
 119 }
 120
 121 struct bundle_transport_data {
 122         int fd;
 123         struct bundle_header header;
 124 };
 125
 126 static struct ref *get_refs_from_bundle(struct transport *transport,
 127                                         int for_push,
 128                                         const struct argv_array *ref_prefixes)
 129 {
 130         struct bundle_transport_data *data = transport->data;
 131         struct ref *result = NULL;
 132         int i;
 133
 134         if (for_push)
 135                 return NULL;
 136
 137         if (data->fd > 0)
 138                 close(data->fd);
 139         data->fd = read_bundle_header(transport->url, &data->header);
 140         if (data->fd < 0)
 141                 die ("Could not read bundle '%s'.", transport->url);
 142         for (i = 0; i < data->header.references.nr; i++) {
 143                 struct ref_list_entry *e = data->header.references.list + i;
 144                 struct ref *ref = alloc_ref(e->name);
 145                 oidcpy(&ref->old_oid, &e->oid);
 146                 ref->next = result;
 147                 result = ref;
 148         }
 149         return result;
 150 }
 151
 152 static int fetch_refs_from_bundle(struct transport *transport,
 153                                int nr_heads, struct ref **to_fetch)
 154 {
 155         struct bundle_transport_data *data = transport->data;
 156         return unbundle(&data->header, data->fd,
 157                         transport->progress ? BUNDLE_VERBOSE : 0);
 158 }
 159
 160 static int close_bundle(struct transport *transport)
 161 {
 162         struct bundle_transport_data *data = transport->data;
 163         if (data->fd > 0)
 164                 close(data->fd);
 165         free(data);
 166         return 0;
 167 }
 168
 169 struct git_transport_data {
 170         struct git_transport_options options;
 171         struct child_process *conn;
 172         int fd[2];
 173         unsigned got_remote_heads : 1;
 174         enum protocol_version version;
 175         struct oid_array extra_have;
 176         struct oid_array shallow;
 177 };
 178
 179 static int set_git_option(struct git_transport_options *opts,
 180                           const char *name, const char *value)
 181 {
 182         if (!strcmp(name, TRANS_OPT_UPLOADPACK)) {
 183                 opts->uploadpack = value;
 184                 return 0;
 185         } else if (!strcmp(name, TRANS_OPT_RECEIVEPACK)) {
 186                 opts->receivepack = value;
 187                 return 0;
 188         } else if (!strcmp(name, TRANS_OPT_THIN)) {
 189                 opts->thin = !!value;
 190                 return 0;
 191         } else if (!strcmp(name, TRANS_OPT_FOLLOWTAGS)) {
 192                 opts->followtags = !!value;
 193                 return 0;
 194         } else if (!strcmp(name, TRANS_OPT_KEEP)) {
 195                 opts->keep = !!value;
 196                 return 0;
 197         } else if (!strcmp(name, TRANS_OPT_UPDATE_SHALLOW)) {
 198                 opts->update_shallow = !!value;
 199                 return 0;
 200         } else if (!strcmp(name, TRANS_OPT_DEPTH)) {
 201                 if (!value)
 202                         opts->depth = 0;
 203                 else {
 204                         char *end;
 205                         opts->depth = strtol(value, &end, 0);
 206                         if (*end)
 207                                 die(_("transport: invalid depth option '%s'"), value);
 208                 }
 209                 return 0;
 210         } else if (!strcmp(name, TRANS_OPT_DEEPEN_SINCE)) {
 211                 opts->deepen_since = value;
 212                 return 0;
 213         } else if (!strcmp(name, TRANS_OPT_DEEPEN_NOT)) {
 214                 opts->deepen_not = (const struct string_list *)value;
 215                 return 0;
 216         } else if (!strcmp(name, TRANS_OPT_DEEPEN_RELATIVE)) {
 217                 opts->deepen_relative = !!value;
 218                 return 0;
 219         } else if (!strcmp(name, TRANS_OPT_FROM_PROMISOR)) {
 220                 opts->from_promisor = !!value;
 221                 return 0;
 222         } else if (!strcmp(name, TRANS_OPT_NO_DEPENDENTS)) {
 223                 opts->no_dependents = !!value;
 224                 return 0;
 225         } else if (!strcmp(name, TRANS_OPT_LIST_OBJECTS_FILTER)) {
 226                 parse_list_objects_filter(&opts->filter_options, value);
 227                 return 0;
 228         }
 229         return 1;
 230 }
 231
 232 static int connect_setup(struct transport *transport, int for_push)
 233 {
 234         struct git_transport_data *data = transport->data;
 235         int flags = transport->verbose > 0 ? CONNECT_VERBOSE : 0;
 236
 237         if (data->conn)
 238                 return 0;
 239
 240         switch (transport->family) {
 241         case TRANSPORT_FAMILY_ALL: break;
 242         case TRANSPORT_FAMILY_IPV4: flags |= CONNECT_IPV4; break;
 243         case TRANSPORT_FAMILY_IPV6: flags |= CONNECT_IPV6; break;
 244         }
 245
 246         data->conn = git_connect(data->fd, transport->url,
 247                                  for_push ? data->options.receivepack :
 248                                  data->options.uploadpack,
 249                                  flags);
 250
 251         return 0;
 252 }
 253
 254 static struct ref *get_refs_via_connect(struct transport *transport, int for_push,
 255                                         const struct argv_array *ref_prefixes)
 256 {
 257         struct git_transport_data *data = transport->data;
 258         struct ref *refs = NULL;
 259         struct packet_reader reader;
 260
 261         connect_setup(transport, for_push);
 262
 263         packet_reader_init(&reader, data->fd[0], NULL, 0,
 264                            PACKET_READ_CHOMP_NEWLINE |
 265                            PACKET_READ_GENTLE_ON_EOF);
 266
 267         data->version = discover_version(&reader);
 268         switch (data->version) {
 269         case protocol_v2:
 270                 get_remote_refs(data->fd[1], &reader, &refs, for_push,
 271                                 ref_prefixes, transport->server_options);
 272                 break;
 273         case protocol_v1:
 274         case protocol_v0:
 275                 get_remote_heads(&reader, &refs,
 276                                  for_push ? REF_NORMAL : 0,
 277                                  &data->extra_have,
 278                                  &data->shallow);
 279                 break;
 280         case protocol_unknown_version:
 281                 BUG("unknown protocol version");
 282         }
 283         data->got_remote_heads = 1;
 284
 285         return refs;
 286 }
 287
 288 static int fetch_refs_via_pack(struct transport *transport,
 289                                int nr_heads, struct ref **to_fetch)
 290 {
 291         int ret = 0;
 292         struct git_transport_data *data = transport->data;
 293         struct ref *refs = NULL;
 294         char *dest = xstrdup(transport->url);
 295         struct fetch_pack_args args;
 296         struct ref *refs_tmp = NULL;
 297
 298         memset(&args, 0, sizeof(args));
 299         args.uploadpack = data->options.uploadpack;
 300         args.keep_pack = data->options.keep;
 301         args.lock_pack = 1;
 302         args.use_thin_pack = data->options.thin;
 303         args.include_tag = data->options.followtags;
 304         args.verbose = (transport->verbose > 1);
 305         args.quiet = (transport->verbose < 0);
 306         args.no_progress = !transport->progress;
 307         args.depth = data->options.depth;
 308         args.deepen_since = data->options.deepen_since;
 309         args.deepen_not = data->options.deepen_not;
 310         args.deepen_relative = data->options.deepen_relative;
 311         args.check_self_contained_and_connected =
 312                 data->options.check_self_contained_and_connected;
 313         args.cloning = transport->cloning;
 314         args.update_shallow = data->options.update_shallow;
 315         args.from_promisor = data->options.from_promisor;
 316         args.no_dependents = data->options.no_dependents;
 317         args.filter_options = data->options.filter_options;
 318         args.stateless_rpc = transport->stateless_rpc;
 319         args.server_options = transport->server_options;
 320
 321         if (!data->got_remote_heads)
 322                 refs_tmp = get_refs_via_connect(transport, 0, NULL);
 323
 324         switch (data->version) {
 325         case protocol_v2:
 326                 refs = fetch_pack(&args, data->fd, data->conn,
 327                                   refs_tmp ? refs_tmp : transport->remote_refs,
 328                                   dest, to_fetch, nr_heads, &data->shallow,
 329                                   &transport->pack_lockfile, data->version);
 330                 break;
 331         case protocol_v1:
 332         case protocol_v0:
 333                 refs = fetch_pack(&args, data->fd, data->conn,
 334                                   refs_tmp ? refs_tmp : transport->remote_refs,
 335                                   dest, to_fetch, nr_heads, &data->shallow,
 336                                   &transport->pack_lockfile, data->version);
 337                 break;
 338         case protocol_unknown_version:
 339                 BUG("unknown protocol version");
 340         }
 341
 342         close(data->fd[0]);
 343         close(data->fd[1]);
 344         if (finish_connect(data->conn))
 345                 ret = -1;
 346         data->conn = NULL;
 347         data->got_remote_heads = 0;
 348         data->options.self_contained_and_connected =
 349                 args.self_contained_and_connected;
 350
 351         if (refs == NULL)
 352                 ret = -1;
 353         if (report_unmatched_refs(to_fetch, nr_heads))
 354                 ret = -1;
 355
 356         free_refs(refs_tmp);
 357         free_refs(refs);
 358         free(dest);
 359         return ret;
 360 }
 361
 362 static int push_had_errors(struct ref *ref)
 363 {
 364         for (; ref; ref = ref->next) {
 365                 switch (ref->status) {
 366                 case REF_STATUS_NONE:
 367                 case REF_STATUS_UPTODATE:
 368                 case REF_STATUS_OK:
 369                         break;
 370                 default:
 371                         return 1;
 372                 }
 373         }
 374         return 0;
 375 }
 376
 377 int transport_refs_pushed(struct ref *ref)
 378 {
 379         for (; ref; ref = ref->next) {
 380                 switch(ref->status) {
 381                 case REF_STATUS_NONE:
 382                 case REF_STATUS_UPTODATE:
 383                         break;
 384                 default:
 385                         return 1;
 386                 }
 387         }
 388         return 0;
 389 }
 390
 391 void transport_update_tracking_ref(struct remote *remote, struct ref *ref, int verbose)
 392 {
 393         struct refspec rs;
 394
 395         if (ref->status != REF_STATUS_OK && ref->status != REF_STATUS_UPTODATE)
 396                 return;
 397
 398         rs.src = ref->name;
 399         rs.dst = NULL;
 400
 401         if (!remote_find_tracking(remote, &rs)) {
 402                 if (verbose)
 403                         fprintf(stderr, "updating local tracking ref '%s'\n", rs.dst);
 404                 if (ref->deletion) {
 405                         delete_ref(NULL, rs.dst, NULL, 0);
 406                 } else
 407                         update_ref("update by push", rs.dst, &ref->new_oid,
 408                                    NULL, 0, 0);
 409                 free(rs.dst);
 410         }
 411 }
 412
 413 static void print_ref_status(char flag, const char *summary,
 414                              struct ref *to, struct ref *from, const char *msg,
 415                              int porcelain, int summary_width)
 416 {
 417         if (porcelain) {
 418                 if (from)
 419                         fprintf(stdout, "%c\t%s:%s\t", flag, from->name, to->name);
 420                 else
 421                         fprintf(stdout, "%c\t:%s\t", flag, to->name);
 422                 if (msg)
 423                         fprintf(stdout, "%s (%s)\n", summary, msg);
 424                 else
 425                         fprintf(stdout, "%s\n", summary);
 426         } else {
 427                 const char *red = "", *reset = "";
 428                 if (push_had_errors(to)) {
 429                         red = transport_get_color(TRANSPORT_COLOR_REJECTED);
 430                         reset = transport_get_color(TRANSPORT_COLOR_RESET);
 431                 }
 432                 fprintf(stderr, " %s%c %-*s%s ", red, flag, summary_width,
 433                         summary, reset);
 434                 if (from)
 435                         fprintf(stderr, "%s -> %s", prettify_refname(from->name), prettify_refname(to->name));
 436                 else
 437                         fputs(prettify_refname(to->name), stderr);
 438                 if (msg) {
 439                         fputs(" (", stderr);
 440                         fputs(msg, stderr);
 441                         fputc(')', stderr);
 442                 }
 443                 fputc('\n', stderr);
 444         }
 445 }
 446
 447 static void print_ok_ref_status(struct ref *ref, int porcelain, int summary_width)
 448 {
 449         if (ref->deletion)
 450                 print_ref_status('-', "[deleted]", ref, NULL, NULL,
 451                                  porcelain, summary_width);
 452         else if (is_null_oid(&ref->old_oid))
 453                 print_ref_status('*',
 454                         (starts_with(ref->name, "refs/tags/") ? "[new tag]" :
 455                         "[new branch]"),
 456                         ref, ref->peer_ref, NULL, porcelain, summary_width);
 457         else {
 458                 struct strbuf quickref = STRBUF_INIT;
 459                 char type;
 460                 const char *msg;
 461
 462                 strbuf_add_unique_abbrev(&quickref, &ref->old_oid,
 463                                          DEFAULT_ABBREV);
 464                 if (ref->forced_update) {
 465                         strbuf_addstr(&quickref, "...");
 466                         type = '+';
 467                         msg = "forced update";
 468                 } else {
 469                         strbuf_addstr(&quickref, "..");
 470                         type = ' ';
 471                         msg = NULL;
 472                 }
 473                 strbuf_add_unique_abbrev(&quickref, &ref->new_oid,
 474                                          DEFAULT_ABBREV);
 475
 476                 print_ref_status(type, quickref.buf, ref, ref->peer_ref, msg,
 477                                  porcelain, summary_width);
 478                 strbuf_release(&quickref);
 479         }
 480 }
 481
 482 static int print_one_push_status(struct ref *ref, const char *dest, int count,
 483                                  int porcelain, int summary_width)
 484 {
 485         if (!count) {
 486                 char *url = transport_anonymize_url(dest);
 487                 fprintf(porcelain ? stdout : stderr, "To %s\n", url);
 488                 free(url);
 489         }
 490
 491         switch(ref->status) {
 492         case REF_STATUS_NONE:
 493                 print_ref_status('X', "[no match]", ref, NULL, NULL,
 494                                  porcelain, summary_width);
 495                 break;
 496         case REF_STATUS_REJECT_NODELETE:
 497                 print_ref_status('!', "[rejected]", ref, NULL,
 498                                  "remote does not support deleting refs",
 499                                  porcelain, summary_width);
 500                 break;
 501         case REF_STATUS_UPTODATE:
 502                 print_ref_status('=', "[up to date]", ref,
 503                                  ref->peer_ref, NULL, porcelain, summary_width);
 504                 break;
 505         case REF_STATUS_REJECT_NONFASTFORWARD:
 506                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 507                                  "non-fast-forward", porcelain, summary_width);
 508                 break;
 509         case REF_STATUS_REJECT_ALREADY_EXISTS:
 510                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 511                                  "already exists", porcelain, summary_width);
 512                 break;
 513         case REF_STATUS_REJECT_FETCH_FIRST:
 514                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 515                                  "fetch first", porcelain, summary_width);
 516                 break;
 517         case REF_STATUS_REJECT_NEEDS_FORCE:
 518                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 519                                  "needs force", porcelain, summary_width);
 520                 break;
 521         case REF_STATUS_REJECT_STALE:
 522                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 523                                  "stale info", porcelain, summary_width);
 524                 break;
 525         case REF_STATUS_REJECT_SHALLOW:
 526                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 527                                  "new shallow roots not allowed",
 528                                  porcelain, summary_width);
 529                 break;
 530         case REF_STATUS_REMOTE_REJECT:
 531                 print_ref_status('!', "[remote rejected]", ref,
 532                                  ref->deletion ? NULL : ref->peer_ref,
 533                                  ref->remote_status, porcelain, summary_width);
 534                 break;
 535         case REF_STATUS_EXPECTING_REPORT:
 536                 print_ref_status('!', "[remote failure]", ref,
 537                                  ref->deletion ? NULL : ref->peer_ref,
 538                                  "remote failed to report status",
 539                                  porcelain, summary_width);
 540                 break;
 541         case REF_STATUS_ATOMIC_PUSH_FAILED:
 542                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 543                                  "atomic push failed", porcelain, summary_width);
 544                 break;
 545         case REF_STATUS_OK:
 546                 print_ok_ref_status(ref, porcelain, summary_width);
 547                 break;
 548         }
 549
 550         return 1;
 551 }
 552
 553 static int measure_abbrev(const struct object_id *oid, int sofar)
 554 {
 555         char hex[GIT_MAX_HEXSZ + 1];
 556         int w = find_unique_abbrev_r(hex, oid, DEFAULT_ABBREV);
 557
 558         return (w < sofar) ? sofar : w;
 559 }
 560
 561 int transport_summary_width(const struct ref *refs)
 562 {
 563         int maxw = -1;
 564
 565         for (; refs; refs = refs->next) {
 566                 maxw = measure_abbrev(&refs->old_oid, maxw);
 567                 maxw = measure_abbrev(&refs->new_oid, maxw);
 568         }
 569         if (maxw < 0)
 570                 maxw = FALLBACK_DEFAULT_ABBREV;
 571         return (2 * maxw + 3);
 572 }
 573
 574 void transport_print_push_status(const char *dest, struct ref *refs,
 575                                   int verbose, int porcelain, unsigned int *reject_reasons)
 576 {
 577         struct ref *ref;
 578         int n = 0;
 579         char *head;
 580         int summary_width = transport_summary_width(refs);
 581
 582         if (transport_color_config() < 0)
 583                 warning(_("could not parse transport.color.* config"));
 584
 585         head = resolve_refdup("HEAD", RESOLVE_REF_READING, NULL, NULL);
 586
 587         if (verbose) {
 588                 for (ref = refs; ref; ref = ref->next)
 589                         if (ref->status == REF_STATUS_UPTODATE)
 590                                 n += print_one_push_status(ref, dest, n,
 591                                                            porcelain, summary_width);
 592         }
 593
 594         for (ref = refs; ref; ref = ref->next)
 595                 if (ref->status == REF_STATUS_OK)
 596                         n += print_one_push_status(ref, dest, n,
 597                                                    porcelain, summary_width);
 598
 599         *reject_reasons = 0;
 600         for (ref = refs; ref; ref = ref->next) {
 601                 if (ref->status != REF_STATUS_NONE &&
 602                     ref->status != REF_STATUS_UPTODATE &&
 603                     ref->status != REF_STATUS_OK)
 604                         n += print_one_push_status(ref, dest, n,
 605                                                    porcelain, summary_width);
 606                 if (ref->status == REF_STATUS_REJECT_NONFASTFORWARD) {
 607                         if (head != NULL && !strcmp(head, ref->name))
 608                                 *reject_reasons |= REJECT_NON_FF_HEAD;
 609                         else
 610                                 *reject_reasons |= REJECT_NON_FF_OTHER;
 611                 } else if (ref->status == REF_STATUS_REJECT_ALREADY_EXISTS) {
 612                         *reject_reasons |= REJECT_ALREADY_EXISTS;
 613                 } else if (ref->status == REF_STATUS_REJECT_FETCH_FIRST) {
 614                         *reject_reasons |= REJECT_FETCH_FIRST;
 615                 } else if (ref->status == REF_STATUS_REJECT_NEEDS_FORCE) {
 616                         *reject_reasons |= REJECT_NEEDS_FORCE;
 617                 }
 618         }
 619         free(head);
 620 }
 621
 622 void transport_verify_remote_names(int nr_heads, const char **heads)
 623 {
 624         int i;
 625
 626         for (i = 0; i < nr_heads; i++) {
 627                 const char *local = heads[i];
 628                 const char *remote = strrchr(heads[i], ':');
 629
 630                 if (*local == '+')
 631                         local++;
 632
 633                 /* A matching refspec is okay.  */
 634                 if (remote == local && remote[1] == '\0')
 635                         continue;
 636
 637                 remote = remote ? (remote + 1) : local;
 638                 if (check_refname_format(remote,
 639                                 REFNAME_ALLOW_ONELEVEL|REFNAME_REFSPEC_PATTERN))
 640                         die("remote part of refspec is not a valid name in %s",
 641                                 heads[i]);
 642         }
 643 }
 644
 645 static int git_transport_push(struct transport *transport, struct ref *remote_refs, int flags)
 646 {
 647         struct git_transport_data *data = transport->data;
 648         struct send_pack_args args;
 649         int ret = 0;
 650
 651         if (transport_color_config() < 0)
 652                 return -1;
 653
 654         if (!data->got_remote_heads)
 655                 get_refs_via_connect(transport, 1, NULL);
 656
 657         memset(&args, 0, sizeof(args));
 658         args.send_mirror = !!(flags & TRANSPORT_PUSH_MIRROR);
 659         args.force_update = !!(flags & TRANSPORT_PUSH_FORCE);
 660         args.use_thin_pack = data->options.thin;
 661         args.verbose = (transport->verbose > 0);
 662         args.quiet = (transport->verbose < 0);
 663         args.progress = transport->progress;
 664         args.dry_run = !!(flags & TRANSPORT_PUSH_DRY_RUN);
 665         args.porcelain = !!(flags & TRANSPORT_PUSH_PORCELAIN);
 666         args.atomic = !!(flags & TRANSPORT_PUSH_ATOMIC);
 667         args.push_options = transport->push_options;
 668         args.url = transport->url;
 669
 670         if (flags & TRANSPORT_PUSH_CERT_ALWAYS)
 671                 args.push_cert = SEND_PACK_PUSH_CERT_ALWAYS;
 672         else if (flags & TRANSPORT_PUSH_CERT_IF_ASKED)
 673                 args.push_cert = SEND_PACK_PUSH_CERT_IF_ASKED;
 674         else
 675                 args.push_cert = SEND_PACK_PUSH_CERT_NEVER;
 676
 677         switch (data->version) {
 678         case protocol_v2:
 679                 die("support for protocol v2 not implemented yet");
 680                 break;
 681         case protocol_v1:
 682         case protocol_v0:
 683                 ret = send_pack(&args, data->fd, data->conn, remote_refs,
 684                                 &data->extra_have);
 685                 break;
 686         case protocol_unknown_version:
 687                 BUG("unknown protocol version");
 688         }
 689
 690         close(data->fd[1]);
 691         close(data->fd[0]);
 692         ret |= finish_connect(data->conn);
 693         data->conn = NULL;
 694         data->got_remote_heads = 0;
 695
 696         return ret;
 697 }
 698
 699 static int connect_git(struct transport *transport, const char *name,
 700                        const char *executable, int fd[2])
 701 {
 702         struct git_transport_data *data = transport->data;
 703         data->conn = git_connect(data->fd, transport->url,
 704                                  executable, 0);
 705         fd[0] = data->fd[0];
 706         fd[1] = data->fd[1];
 707         return 0;
 708 }
 709
 710 static int disconnect_git(struct transport *transport)
 711 {
 712         struct git_transport_data *data = transport->data;
 713         if (data->conn) {
 714                 if (data->got_remote_heads)
 715                         packet_flush(data->fd[1]);
 716                 close(data->fd[0]);
 717                 close(data->fd[1]);
 718                 finish_connect(data->conn);
 719         }
 720
 721         free(data);
 722         return 0;
 723 }
 724
 725 static struct transport_vtable taken_over_vtable = {
 726         NULL,
 727         get_refs_via_connect,
 728         fetch_refs_via_pack,
 729         git_transport_push,
 730         NULL,
 731         disconnect_git
 732 };
 733
 734 void transport_take_over(struct transport *transport,
 735                          struct child_process *child)
 736 {
 737         struct git_transport_data *data;
 738
 739         if (!transport->smart_options)
 740                 BUG("taking over transport requires non-NULL "
 741                     "smart_options field.");
 742
 743         data = xcalloc(1, sizeof(*data));
 744         data->options = *transport->smart_options;
 745         data->conn = child;
 746         data->fd[0] = data->conn->out;
 747         data->fd[1] = data->conn->in;
 748         data->got_remote_heads = 0;
 749         transport->data = data;
 750
 751         transport->vtable = &taken_over_vtable;
 752         transport->smart_options = &(data->options);
 753
 754         transport->cannot_reuse = 1;
 755 }
 756
 757 static int is_file(const char *url)
 758 {
 759         struct stat buf;
 760         if (stat(url, &buf))
 761                 return 0;
 762         return S_ISREG(buf.st_mode);
 763 }
 764
 765 static int external_specification_len(const char *url)
 766 {
 767         return strchr(url, ':') - url;
 768 }
 769
 770 static const struct string_list *protocol_whitelist(void)
 771 {
 772         static int enabled = -1;
 773         static struct string_list allowed = STRING_LIST_INIT_DUP;
 774
 775         if (enabled < 0) {
 776                 const char *v = getenv("GIT_ALLOW_PROTOCOL");
 777                 if (v) {
 778                         string_list_split(&allowed, v, ':', -1);
 779                         string_list_sort(&allowed);
 780                         enabled = 1;
 781                 } else {
 782                         enabled = 0;
 783                 }
 784         }
 785
 786         return enabled ? &allowed : NULL;
 787 }
 788
 789 enum protocol_allow_config {
 790         PROTOCOL_ALLOW_NEVER = 0,
 791         PROTOCOL_ALLOW_USER_ONLY,
 792         PROTOCOL_ALLOW_ALWAYS
 793 };
 794
 795 static enum protocol_allow_config parse_protocol_config(const char *key,
 796                                                         const char *value)
 797 {
 798         if (!strcasecmp(value, "always"))
 799                 return PROTOCOL_ALLOW_ALWAYS;
 800         else if (!strcasecmp(value, "never"))
 801                 return PROTOCOL_ALLOW_NEVER;
 802         else if (!strcasecmp(value, "user"))
 803                 return PROTOCOL_ALLOW_USER_ONLY;
 804
 805         die("unknown value for config '%s': %s", key, value);
 806 }
 807
 808 static enum protocol_allow_config get_protocol_config(const char *type)
 809 {
 810         char *key = xstrfmt("protocol.%s.allow", type);
 811         char *value;
 812
 813         /* first check the per-protocol config */
 814         if (!git_config_get_string(key, &value)) {
 815                 enum protocol_allow_config ret =
 816                         parse_protocol_config(key, value);
 817                 free(key);
 818                 free(value);
 819                 return ret;
 820         }
 821         free(key);
 822
 823         /* if defined, fallback to user-defined default for unknown protocols */
 824         if (!git_config_get_string("protocol.allow", &value)) {
 825                 enum protocol_allow_config ret =
 826                         parse_protocol_config("protocol.allow", value);
 827                 free(value);
 828                 return ret;
 829         }
 830
 831         /* fallback to built-in defaults */
 832         /* known safe */
 833         if (!strcmp(type, "http") ||
 834             !strcmp(type, "https") ||
 835             !strcmp(type, "git") ||
 836             !strcmp(type, "ssh") ||
 837             !strcmp(type, "file"))
 838                 return PROTOCOL_ALLOW_ALWAYS;
 839
 840         /* known scary; err on the side of caution */
 841         if (!strcmp(type, "ext"))
 842                 return PROTOCOL_ALLOW_NEVER;
 843
 844         /* unknown; by default let them be used only directly by the user */
 845         return PROTOCOL_ALLOW_USER_ONLY;
 846 }
 847
 848 int is_transport_allowed(const char *type, int from_user)
 849 {
 850         const struct string_list *whitelist = protocol_whitelist();
 851         if (whitelist)
 852                 return string_list_has_string(whitelist, type);
 853
 854         switch (get_protocol_config(type)) {
 855         case PROTOCOL_ALLOW_ALWAYS:
 856                 return 1;
 857         case PROTOCOL_ALLOW_NEVER:
 858                 return 0;
 859         case PROTOCOL_ALLOW_USER_ONLY:
 860                 if (from_user < 0)
 861                         from_user = git_env_bool("GIT_PROTOCOL_FROM_USER", 1);
 862                 return from_user;
 863         }
 864
 865         BUG("invalid protocol_allow_config type");
 866 }
 867
 868 void transport_check_allowed(const char *type)
 869 {
 870         if (!is_transport_allowed(type, -1))
 871                 die("transport '%s' not allowed", type);
 872 }
 873
 874 static struct transport_vtable bundle_vtable = {
 875         NULL,
 876         get_refs_from_bundle,
 877         fetch_refs_from_bundle,
 878         NULL,
 879         NULL,
 880         close_bundle
 881 };
 882
 883 static struct transport_vtable builtin_smart_vtable = {
 884         NULL,
 885         get_refs_via_connect,
 886         fetch_refs_via_pack,
 887         git_transport_push,
 888         connect_git,
 889         disconnect_git
 890 };
 891
 892 struct transport *transport_get(struct remote *remote, const char *url)
 893 {
 894         const char *helper;
 895         struct transport *ret = xcalloc(1, sizeof(*ret));
 896
 897         ret->progress = isatty(2);
 898
 899         if (!remote)
 900                 die("No remote provided to transport_get()");
 901
 902         ret->got_remote_refs = 0;
 903         ret->remote = remote;
 904         helper = remote->foreign_vcs;
 905
 906         if (!url && remote->url)
 907                 url = remote->url[0];
 908         ret->url = url;
 909
 910         /* maybe it is a foreign URL? */
 911         if (url) {
 912                 const char *p = url;
 913
 914                 while (is_urlschemechar(p == url, *p))
 915                         p++;
 916                 if (starts_with(p, "::"))
 917                         helper = xstrndup(url, p - url);
 918         }
 919
 920         if (helper) {
 921                 transport_helper_init(ret, helper);
 922         } else if (starts_with(url, "rsync:")) {
 923                 die("git-over-rsync is no longer supported");
 924         } else if (url_is_local_not_ssh(url) && is_file(url) && is_bundle(url, 1)) {
 925                 struct bundle_transport_data *data = xcalloc(1, sizeof(*data));
 926                 transport_check_allowed("file");
 927                 ret->data = data;
 928                 ret->vtable = &bundle_vtable;
 929                 ret->smart_options = NULL;
 930         } else if (!is_url(url)
 931                 || starts_with(url, "file://")
 932                 || starts_with(url, "git://")
 933                 || starts_with(url, "ssh://")
 934                 || starts_with(url, "git+ssh://") /* deprecated - do not use */
 935                 || starts_with(url, "ssh+git://") /* deprecated - do not use */
 936                 ) {
 937                 /*
 938                  * These are builtin smart transports; "allowed" transports
 939                  * will be checked individually in git_connect.
 940                  */
 941                 struct git_transport_data *data = xcalloc(1, sizeof(*data));
 942                 ret->data = data;
 943                 ret->vtable = &builtin_smart_vtable;
 944                 ret->smart_options = &(data->options);
 945
 946                 data->conn = NULL;
 947                 data->got_remote_heads = 0;
 948         } else {
 949                 /* Unknown protocol in URL. Pass to external handler. */
 950                 int len = external_specification_len(url);
 951                 char *handler = xmemdupz(url, len);
 952                 transport_helper_init(ret, handler);
 953         }
 954
 955         if (ret->smart_options) {
 956                 ret->smart_options->thin = 1;
 957                 ret->smart_options->uploadpack = "git-upload-pack";
 958                 if (remote->uploadpack)
 959                         ret->smart_options->uploadpack = remote->uploadpack;
 960                 ret->smart_options->receivepack = "git-receive-pack";
 961                 if (remote->receivepack)
 962                         ret->smart_options->receivepack = remote->receivepack;
 963         }
 964
 965         return ret;
 966 }
 967
 968 int transport_set_option(struct transport *transport,
 969                          const char *name, const char *value)
 970 {
 971         int git_reports = 1, protocol_reports = 1;
 972
 973         if (transport->smart_options)
 974                 git_reports = set_git_option(transport->smart_options,
 975                                              name, value);
 976
 977         if (transport->vtable->set_option)
 978                 protocol_reports = transport->vtable->set_option(transport,
 979                                                                  name, value);
 980
 981         /* If either report is 0, report 0 (success). */
 982         if (!git_reports || !protocol_reports)
 983                 return 0;
 984         /* If either reports -1 (invalid value), report -1. */
 985         if ((git_reports == -1) || (protocol_reports == -1))
 986                 return -1;
 987         /* Otherwise if both report unknown, report unknown. */
 988         return 1;
 989 }
 990
 991 void transport_set_verbosity(struct transport *transport, int verbosity,
 992         int force_progress)
 993 {
 994         if (verbosity >= 1)
 995                 transport->verbose = verbosity <= 3 ? verbosity : 3;
 996         if (verbosity < 0)
 997                 transport->verbose = -1;
 998
 999         /**
1000          * Rules used to determine whether to report progress (processing aborts
1001          * when a rule is satisfied):
1002          *
1003          *   . Report progress, if force_progress is 1 (ie. --progress).
1004          *   . Don't report progress, if force_progress is 0 (ie. --no-progress).
1005          *   . Don't report progress, if verbosity < 0 (ie. -q/--quiet ).
1006          *   . Report progress if isatty(2) is 1.
1007          **/
1008         if (force_progress >= 0)
1009                 transport->progress = !!force_progress;
1010         else
1011                 transport->progress = verbosity >= 0 && isatty(2);
1012 }
1013
1014 static void die_with_unpushed_submodules(struct string_list *needs_pushing)
1015 {
1016         int i;
1017
1018         fprintf(stderr, _("The following submodule paths contain changes that can\n"
1019                         "not be found on any remote:\n"));
1020         for (i = 0; i < needs_pushing->nr; i++)
1021                 fprintf(stderr, "  %s\n", needs_pushing->items[i].string);
1022         fprintf(stderr, _("\nPlease try\n\n"
1023                           "     git push --recurse-submodules=on-demand\n\n"
1024                           "or cd to the path and use\n\n"
1025                           "     git push\n\n"
1026                           "to push them to a remote.\n\n"));
1027
1028         string_list_clear(needs_pushing, 0);
1029
1030         die(_("Aborting."));
1031 }
1032
1033 static int run_pre_push_hook(struct transport *transport,
1034                              struct ref *remote_refs)
1035 {
1036         int ret = 0, x;
1037         struct ref *r;
1038         struct child_process proc = CHILD_PROCESS_INIT;
1039         struct strbuf buf;
1040         const char *argv[4];
1041
1042         if (!(argv[0] = find_hook("pre-push")))
1043                 return 0;
1044
1045         argv[1] = transport->remote->name;
1046         argv[2] = transport->url;
1047         argv[3] = NULL;
1048
1049         proc.argv = argv;
1050         proc.in = -1;
1051
1052         if (start_command(&proc)) {
1053                 finish_command(&proc);
1054                 return -1;
1055         }
1056
1057         sigchain_push(SIGPIPE, SIG_IGN);
1058
1059         strbuf_init(&buf, 256);
1060
1061         for (r = remote_refs; r; r = r->next) {
1062                 if (!r->peer_ref) continue;
1063                 if (r->status == REF_STATUS_REJECT_NONFASTFORWARD) continue;
1064                 if (r->status == REF_STATUS_REJECT_STALE) continue;
1065                 if (r->status == REF_STATUS_UPTODATE) continue;
1066
1067                 strbuf_reset(&buf);
1068                 strbuf_addf( &buf, "%s %s %s %s\n",
1069                          r->peer_ref->name, oid_to_hex(&r->new_oid),
1070                          r->name, oid_to_hex(&r->old_oid));
1071
1072                 if (write_in_full(proc.in, buf.buf, buf.len) < 0) {
1073                         /* We do not mind if a hook does not read all refs. */
1074                         if (errno != EPIPE)
1075                                 ret = -1;
1076                         break;
1077                 }
1078         }
1079
1080         strbuf_release(&buf);
1081
1082         x = close(proc.in);
1083         if (!ret)
1084                 ret = x;
1085
1086         sigchain_pop(SIGPIPE);
1087
1088         x = finish_command(&proc);
1089         if (!ret)
1090                 ret = x;
1091
1092         return ret;
1093 }
1094
1095 int transport_push(struct transport *transport,
1096                    int refspec_nr, const char **refspec, int flags,
1097                    unsigned int *reject_reasons)
1098 {
1099         *reject_reasons = 0;
1100         transport_verify_remote_names(refspec_nr, refspec);
1101
1102         if (transport_color_config() < 0)
1103                 return -1;
1104
1105         if (transport->vtable->push_refs) {
1106                 struct ref *remote_refs;
1107                 struct ref *local_refs = get_local_heads();
1108                 int match_flags = MATCH_REFS_NONE;
1109                 int verbose = (transport->verbose > 0);
1110                 int quiet = (transport->verbose < 0);
1111                 int porcelain = flags & TRANSPORT_PUSH_PORCELAIN;
1112                 int pretend = flags & TRANSPORT_PUSH_DRY_RUN;
1113                 int push_ret, ret, err;
1114                 struct refspec *tmp_rs;
1115                 struct argv_array ref_prefixes = ARGV_ARRAY_INIT;
1116                 int i;
1117
1118                 if (check_push_refs(local_refs, refspec_nr, refspec) < 0)
1119                         return -1;
1120
1121                 tmp_rs = parse_push_refspec(refspec_nr, refspec);
1122                 for (i = 0; i < refspec_nr; i++) {
1123                         const char *prefix = NULL;
1124
1125                         if (tmp_rs[i].dst)
1126                                 prefix = tmp_rs[i].dst;
1127                         else if (tmp_rs[i].src && !tmp_rs[i].exact_sha1)
1128                                 prefix = tmp_rs[i].src;
1129
1130                         if (prefix) {
1131                                 const char *glob = strchr(prefix, '*');
1132                                 if (glob)
1133                                         argv_array_pushf(&ref_prefixes, "%.*s",
1134                                                          (int)(glob - prefix),
1135                                                          prefix);
1136                                 else
1137                                         expand_ref_prefix(&ref_prefixes, prefix);
1138                         }
1139                 }
1140
1141                 remote_refs = transport->vtable->get_refs_list(transport, 1,
1142                                                                &ref_prefixes);
1143
1144                 argv_array_clear(&ref_prefixes);
1145                 free_refspec(refspec_nr, tmp_rs);
1146
1147                 if (flags & TRANSPORT_PUSH_ALL)
1148                         match_flags |= MATCH_REFS_ALL;
1149                 if (flags & TRANSPORT_PUSH_MIRROR)
1150                         match_flags |= MATCH_REFS_MIRROR;
1151                 if (flags & TRANSPORT_PUSH_PRUNE)
1152                         match_flags |= MATCH_REFS_PRUNE;
1153                 if (flags & TRANSPORT_PUSH_FOLLOW_TAGS)
1154                         match_flags |= MATCH_REFS_FOLLOW_TAGS;
1155
1156                 if (match_push_refs(local_refs, &remote_refs,
1157                                     refspec_nr, refspec, match_flags)) {
1158                         return -1;
1159                 }
1160
1161                 if (transport->smart_options &&
1162                     transport->smart_options->cas &&
1163                     !is_empty_cas(transport->smart_options->cas))
1164                         apply_push_cas(transport->smart_options->cas,
1165                                        transport->remote, remote_refs);
1166
1167                 set_ref_status_for_push(remote_refs,
1168                         flags & TRANSPORT_PUSH_MIRROR,
1169                         flags & TRANSPORT_PUSH_FORCE);
1170
1171                 if (!(flags & TRANSPORT_PUSH_NO_HOOK))
1172                         if (run_pre_push_hook(transport, remote_refs))
1173                                 return -1;
1174
1175                 if ((flags & (TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND |
1176                               TRANSPORT_RECURSE_SUBMODULES_ONLY)) &&
1177                     !is_bare_repository()) {
1178                         struct ref *ref = remote_refs;
1179                         struct oid_array commits = OID_ARRAY_INIT;
1180
1181                         for (; ref; ref = ref->next)
1182                                 if (!is_null_oid(&ref->new_oid))
1183                                         oid_array_append(&commits,
1184                                                           &ref->new_oid);
1185
1186                         if (!push_unpushed_submodules(&commits,
1187                                                       transport->remote,
1188                                                       refspec, refspec_nr,
1189                                                       transport->push_options,
1190                                                       pretend)) {
1191                                 oid_array_clear(&commits);
1192                                 die("Failed to push all needed submodules!");
1193                         }
1194                         oid_array_clear(&commits);
1195                 }
1196
1197                 if (((flags & TRANSPORT_RECURSE_SUBMODULES_CHECK) ||
1198                      ((flags & (TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND |
1199                                 TRANSPORT_RECURSE_SUBMODULES_ONLY)) &&
1200                       !pretend)) && !is_bare_repository()) {
1201                         struct ref *ref = remote_refs;
1202                         struct string_list needs_pushing = STRING_LIST_INIT_DUP;
1203                         struct oid_array commits = OID_ARRAY_INIT;
1204
1205                         for (; ref; ref = ref->next)
1206                                 if (!is_null_oid(&ref->new_oid))
1207                                         oid_array_append(&commits,
1208                                                           &ref->new_oid);
1209
1210                         if (find_unpushed_submodules(&commits, transport->remote->name,
1211                                                 &needs_pushing)) {
1212                                 oid_array_clear(&commits);
1213                                 die_with_unpushed_submodules(&needs_pushing);
1214                         }
1215                         string_list_clear(&needs_pushing, 0);
1216                         oid_array_clear(&commits);
1217                 }
1218
1219                 if (!(flags & TRANSPORT_RECURSE_SUBMODULES_ONLY))
1220                         push_ret = transport->vtable->push_refs(transport, remote_refs, flags);
1221                 else
1222                         push_ret = 0;
1223                 err = push_had_errors(remote_refs);
1224                 ret = push_ret | err;
1225
1226                 if (!quiet || err)
1227                         transport_print_push_status(transport->url, remote_refs,
1228                                         verbose | porcelain, porcelain,
1229                                         reject_reasons);
1230
1231                 if (flags & TRANSPORT_PUSH_SET_UPSTREAM)
1232                         set_upstreams(transport, remote_refs, pretend);
1233
1234                 if (!(flags & (TRANSPORT_PUSH_DRY_RUN |
1235                                TRANSPORT_RECURSE_SUBMODULES_ONLY))) {
1236                         struct ref *ref;
1237                         for (ref = remote_refs; ref; ref = ref->next)
1238                                 transport_update_tracking_ref(transport->remote, ref, verbose);
1239                 }
1240
1241                 if (porcelain && !push_ret)
1242                         puts("Done");
1243                 else if (!quiet && !ret && !transport_refs_pushed(remote_refs))
1244                         fprintf(stderr, "Everything up-to-date\n");
1245
1246                 return ret;
1247         }
1248         return 1;
1249 }
1250
1251 const struct ref *transport_get_remote_refs(struct transport *transport,
1252                                             const struct argv_array *ref_prefixes)
1253 {
1254         if (!transport->got_remote_refs) {
1255                 transport->remote_refs =
1256                         transport->vtable->get_refs_list(transport, 0,
1257                                                          ref_prefixes);
1258                 transport->got_remote_refs = 1;
1259         }
1260
1261         return transport->remote_refs;
1262 }
1263
1264 int transport_fetch_refs(struct transport *transport, struct ref *refs)
1265 {
1266         int rc;
1267         int nr_heads = 0, nr_alloc = 0, nr_refs = 0;
1268         struct ref **heads = NULL;
1269         struct ref *rm;
1270
1271         for (rm = refs; rm; rm = rm->next) {
1272                 nr_refs++;
1273                 if (rm->peer_ref &&
1274                     !is_null_oid(&rm->old_oid) &&
1275                     !oidcmp(&rm->peer_ref->old_oid, &rm->old_oid))
1276                         continue;
1277                 ALLOC_GROW(heads, nr_heads + 1, nr_alloc);
1278                 heads[nr_heads++] = rm;
1279         }
1280
1281         if (!nr_heads) {
1282                 /*
1283                  * When deepening of a shallow repository is requested,
1284                  * then local and remote refs are likely to still be equal.
1285                  * Just feed them all to the fetch method in that case.
1286                  * This condition shouldn't be met in a non-deepening fetch
1287                  * (see builtin/fetch.c:quickfetch()).
1288                  */
1289                 ALLOC_ARRAY(heads, nr_refs);
1290                 for (rm = refs; rm; rm = rm->next)
1291                         heads[nr_heads++] = rm;
1292         }
1293
1294         rc = transport->vtable->fetch(transport, nr_heads, heads);
1295
1296         free(heads);
1297         return rc;
1298 }
1299
1300 void transport_unlock_pack(struct transport *transport)
1301 {
1302         if (transport->pack_lockfile) {
1303                 unlink_or_warn(transport->pack_lockfile);
1304                 FREE_AND_NULL(transport->pack_lockfile);
1305         }
1306 }
1307
1308 int transport_connect(struct transport *transport, const char *name,
1309                       const char *exec, int fd[2])
1310 {
1311         if (transport->vtable->connect)
1312                 return transport->vtable->connect(transport, name, exec, fd);
1313         else
1314                 die("Operation not supported by protocol");
1315 }
1316
1317 int transport_disconnect(struct transport *transport)
1318 {
1319         int ret = 0;
1320         if (transport->vtable->disconnect)
1321                 ret = transport->vtable->disconnect(transport);
1322         free(transport);
1323         return ret;
1324 }
1325
1326 /*
1327  * Strip username (and password) from a URL and return
1328  * it in a newly allocated string.
1329  */
1330 char *transport_anonymize_url(const char *url)
1331 {
1332         char *scheme_prefix, *anon_part;
1333         size_t anon_len, prefix_len = 0;
1334
1335         anon_part = strchr(url, '@');
1336         if (url_is_local_not_ssh(url) || !anon_part)
1337                 goto literal_copy;
1338
1339         anon_len = strlen(++anon_part);
1340         scheme_prefix = strstr(url, "://");
1341         if (!scheme_prefix) {
1342                 if (!strchr(anon_part, ':'))
1343                         /* cannot be "me@there:/path/name" */
1344                         goto literal_copy;
1345         } else {
1346                 const char *cp;
1347                 /* make sure scheme is reasonable */
1348                 for (cp = url; cp < scheme_prefix; cp++) {
1349                         switch (*cp) {
1350                                 /* RFC 1738 2.1 */
1351                         case '+': case '.': case '-':
1352                                 break; /* ok */
1353                         default:
1354                                 if (isalnum(*cp))
1355                                         break;
1356                                 /* it isn't */
1357                                 goto literal_copy;
1358                         }
1359                 }
1360                 /* @ past the first slash does not count */
1361                 cp = strchr(scheme_prefix + 3, '/');
1362                 if (cp && cp < anon_part)
1363                         goto literal_copy;
1364                 prefix_len = scheme_prefix - url + 3;
1365         }
1366         return xstrfmt("%.*s%.*s", (int)prefix_len, url,
1367                        (int)anon_len, anon_part);
1368 literal_copy:
1369         return xstrdup(url);
1370 }
1371
1372 static void read_alternate_refs(const char *path,
1373                                 alternate_ref_fn *cb,
1374                                 void *data)
1375 {
1376         struct child_process cmd = CHILD_PROCESS_INIT;
1377         struct strbuf line = STRBUF_INIT;
1378         FILE *fh;
1379
1380         cmd.git_cmd = 1;
1381         argv_array_pushf(&cmd.args, "--git-dir=%s", path);
1382         argv_array_push(&cmd.args, "for-each-ref");
1383         argv_array_push(&cmd.args, "--format=%(objectname) %(refname)");
1384         cmd.env = local_repo_env;
1385         cmd.out = -1;
1386
1387         if (start_command(&cmd))
1388                 return;
1389
1390         fh = xfdopen(cmd.out, "r");
1391         while (strbuf_getline_lf(&line, fh) != EOF) {
1392                 struct object_id oid;
1393
1394                 if (get_oid_hex(line.buf, &oid) ||
1395                     line.buf[GIT_SHA1_HEXSZ] != ' ') {
1396                         warning("invalid line while parsing alternate refs: %s",
1397                                 line.buf);
1398                         break;
1399                 }
1400
1401                 cb(line.buf + GIT_SHA1_HEXSZ + 1, &oid, data);
1402         }
1403
1404         fclose(fh);
1405         finish_command(&cmd);
1406 }
1407
1408 struct alternate_refs_data {
1409         alternate_ref_fn *fn;
1410         void *data;
1411 };
1412
1413 static int refs_from_alternate_cb(struct alternate_object_database *e,
1414                                   void *data)
1415 {
1416         struct strbuf path = STRBUF_INIT;
1417         size_t base_len;
1418         struct alternate_refs_data *cb = data;
1419
1420         if (!strbuf_realpath(&path, e->path, 0))
1421                 goto out;
1422         if (!strbuf_strip_suffix(&path, "/objects"))
1423                 goto out;
1424         base_len = path.len;
1425
1426         /* Is this a git repository with refs? */
1427         strbuf_addstr(&path, "/refs");
1428         if (!is_directory(path.buf))
1429                 goto out;
1430         strbuf_setlen(&path, base_len);
1431
1432         read_alternate_refs(path.buf, cb->fn, cb->data);
1433
1434 out:
1435         strbuf_release(&path);
1436         return 0;
1437 }
1438
1439 void for_each_alternate_ref(alternate_ref_fn fn, void *data)
1440 {
1441         struct alternate_refs_data cb;
1442         cb.fn = fn;
1443         cb.data = data;
1444         foreach_alt_odb(refs_from_alternate_cb, &cb);
1445 }