transport.c

   1 #include "cache.h"
   2 #include "transport.h"
   3 #include "run-command.h"
   4 #include "pkt-line.h"
   5 #include "fetch-pack.h"
   6 #include "remote.h"
   7 #include "connect.h"
   8 #include "send-pack.h"
   9 #include "walker.h"
  10 #include "bundle.h"
  11 #include "dir.h"
  12 #include "refs.h"
  13 #include "branch.h"
  14 #include "url.h"
  15 #include "submodule.h"
  16 #include "string-list.h"
  17 #include "sha1-array.h"
  18 #include "sigchain.h"
  19
  20 static void set_upstreams(struct transport *transport, struct ref *refs,
  21         int pretend)
  22 {
  23         struct ref *ref;
  24         for (ref = refs; ref; ref = ref->next) {
  25                 const char *localname;
  26                 const char *tmp;
  27                 const char *remotename;
  28                 unsigned char sha[20];
  29                 int flag = 0;
  30                 /*
  31                  * Check suitability for tracking. Must be successful /
  32                  * already up-to-date ref create/modify (not delete).
  33                  */
  34                 if (ref->status != REF_STATUS_OK &&
  35                         ref->status != REF_STATUS_UPTODATE)
  36                         continue;
  37                 if (!ref->peer_ref)
  38                         continue;
  39                 if (is_null_oid(&ref->new_oid))
  40                         continue;
  41
  42                 /* Follow symbolic refs (mainly for HEAD). */
  43                 localname = ref->peer_ref->name;
  44                 remotename = ref->name;
  45                 tmp = resolve_ref_unsafe(localname, RESOLVE_REF_READING,
  46                                          sha, &flag);
  47                 if (tmp && flag & REF_ISSYMREF &&
  48                         starts_with(tmp, "refs/heads/"))
  49                         localname = tmp;
  50
  51                 /* Both source and destination must be local branches. */
  52                 if (!localname || !starts_with(localname, "refs/heads/"))
  53                         continue;
  54                 if (!remotename || !starts_with(remotename, "refs/heads/"))
  55                         continue;
  56
  57                 if (!pretend)
  58                         install_branch_config(BRANCH_CONFIG_VERBOSE,
  59                                 localname + 11, transport->remote->name,
  60                                 remotename);
  61                 else
  62                         printf(_("Would set upstream of '%s' to '%s' of '%s'\n"),
  63                                 localname + 11, remotename + 11,
  64                                 transport->remote->name);
  65         }
  66 }
  67
  68 struct bundle_transport_data {
  69         int fd;
  70         struct bundle_header header;
  71 };
  72
  73 static struct ref *get_refs_from_bundle(struct transport *transport, int for_push)
  74 {
  75         struct bundle_transport_data *data = transport->data;
  76         struct ref *result = NULL;
  77         int i;
  78
  79         if (for_push)
  80                 return NULL;
  81
  82         if (data->fd > 0)
  83                 close(data->fd);
  84         data->fd = read_bundle_header(transport->url, &data->header);
  85         if (data->fd < 0)
  86                 die ("Could not read bundle '%s'.", transport->url);
  87         for (i = 0; i < data->header.references.nr; i++) {
  88                 struct ref_list_entry *e = data->header.references.list + i;
  89                 struct ref *ref = alloc_ref(e->name);
  90                 hashcpy(ref->old_oid.hash, e->sha1);
  91                 ref->next = result;
  92                 result = ref;
  93         }
  94         return result;
  95 }
  96
  97 static int fetch_refs_from_bundle(struct transport *transport,
  98                                int nr_heads, struct ref **to_fetch)
  99 {
 100         struct bundle_transport_data *data = transport->data;
 101         return unbundle(&data->header, data->fd,
 102                         transport->progress ? BUNDLE_VERBOSE : 0);
 103 }
 104
 105 static int close_bundle(struct transport *transport)
 106 {
 107         struct bundle_transport_data *data = transport->data;
 108         if (data->fd > 0)
 109                 close(data->fd);
 110         free(data);
 111         return 0;
 112 }
 113
 114 struct git_transport_data {
 115         struct git_transport_options options;
 116         struct child_process *conn;
 117         int fd[2];
 118         unsigned got_remote_heads : 1;
 119         struct sha1_array extra_have;
 120         struct sha1_array shallow;
 121 };
 122
 123 static int set_git_option(struct git_transport_options *opts,
 124                           const char *name, const char *value)
 125 {
 126         if (!strcmp(name, TRANS_OPT_UPLOADPACK)) {
 127                 opts->uploadpack = value;
 128                 return 0;
 129         } else if (!strcmp(name, TRANS_OPT_RECEIVEPACK)) {
 130                 opts->receivepack = value;
 131                 return 0;
 132         } else if (!strcmp(name, TRANS_OPT_THIN)) {
 133                 opts->thin = !!value;
 134                 return 0;
 135         } else if (!strcmp(name, TRANS_OPT_FOLLOWTAGS)) {
 136                 opts->followtags = !!value;
 137                 return 0;
 138         } else if (!strcmp(name, TRANS_OPT_KEEP)) {
 139                 opts->keep = !!value;
 140                 return 0;
 141         } else if (!strcmp(name, TRANS_OPT_UPDATE_SHALLOW)) {
 142                 opts->update_shallow = !!value;
 143                 return 0;
 144         } else if (!strcmp(name, TRANS_OPT_DEPTH)) {
 145                 if (!value)
 146                         opts->depth = 0;
 147                 else {
 148                         char *end;
 149                         opts->depth = strtol(value, &end, 0);
 150                         if (*end)
 151                                 die(_("transport: invalid depth option '%s'"), value);
 152                 }
 153                 return 0;
 154         }
 155         return 1;
 156 }
 157
 158 static int connect_setup(struct transport *transport, int for_push)
 159 {
 160         struct git_transport_data *data = transport->data;
 161         int flags = transport->verbose > 0 ? CONNECT_VERBOSE : 0;
 162
 163         if (data->conn)
 164                 return 0;
 165
 166         switch (transport->family) {
 167         case TRANSPORT_FAMILY_ALL: break;
 168         case TRANSPORT_FAMILY_IPV4: flags |= CONNECT_IPV4; break;
 169         case TRANSPORT_FAMILY_IPV6: flags |= CONNECT_IPV6; break;
 170         }
 171
 172         data->conn = git_connect(data->fd, transport->url,
 173                                  for_push ? data->options.receivepack :
 174                                  data->options.uploadpack,
 175                                  flags);
 176
 177         return 0;
 178 }
 179
 180 static struct ref *get_refs_via_connect(struct transport *transport, int for_push)
 181 {
 182         struct git_transport_data *data = transport->data;
 183         struct ref *refs;
 184
 185         connect_setup(transport, for_push);
 186         get_remote_heads(data->fd[0], NULL, 0, &refs,
 187                          for_push ? REF_NORMAL : 0,
 188                          &data->extra_have,
 189                          &data->shallow);
 190         data->got_remote_heads = 1;
 191
 192         return refs;
 193 }
 194
 195 static int fetch_refs_via_pack(struct transport *transport,
 196                                int nr_heads, struct ref **to_fetch)
 197 {
 198         struct git_transport_data *data = transport->data;
 199         struct ref *refs;
 200         char *dest = xstrdup(transport->url);
 201         struct fetch_pack_args args;
 202         struct ref *refs_tmp = NULL;
 203
 204         memset(&args, 0, sizeof(args));
 205         args.uploadpack = data->options.uploadpack;
 206         args.keep_pack = data->options.keep;
 207         args.lock_pack = 1;
 208         args.use_thin_pack = data->options.thin;
 209         args.include_tag = data->options.followtags;
 210         args.verbose = (transport->verbose > 1);
 211         args.quiet = (transport->verbose < 0);
 212         args.no_progress = !transport->progress;
 213         args.depth = data->options.depth;
 214         args.check_self_contained_and_connected =
 215                 data->options.check_self_contained_and_connected;
 216         args.cloning = transport->cloning;
 217         args.update_shallow = data->options.update_shallow;
 218
 219         if (!data->got_remote_heads) {
 220                 connect_setup(transport, 0);
 221                 get_remote_heads(data->fd[0], NULL, 0, &refs_tmp, 0,
 222                                  NULL, &data->shallow);
 223                 data->got_remote_heads = 1;
 224         }
 225
 226         refs = fetch_pack(&args, data->fd, data->conn,
 227                           refs_tmp ? refs_tmp : transport->remote_refs,
 228                           dest, to_fetch, nr_heads, &data->shallow,
 229                           &transport->pack_lockfile);
 230         close(data->fd[0]);
 231         close(data->fd[1]);
 232         if (finish_connect(data->conn)) {
 233                 free_refs(refs);
 234                 refs = NULL;
 235         }
 236         data->conn = NULL;
 237         data->got_remote_heads = 0;
 238         data->options.self_contained_and_connected =
 239                 args.self_contained_and_connected;
 240
 241         free_refs(refs_tmp);
 242         free_refs(refs);
 243         free(dest);
 244         return (refs ? 0 : -1);
 245 }
 246
 247 static int push_had_errors(struct ref *ref)
 248 {
 249         for (; ref; ref = ref->next) {
 250                 switch (ref->status) {
 251                 case REF_STATUS_NONE:
 252                 case REF_STATUS_UPTODATE:
 253                 case REF_STATUS_OK:
 254                         break;
 255                 default:
 256                         return 1;
 257                 }
 258         }
 259         return 0;
 260 }
 261
 262 int transport_refs_pushed(struct ref *ref)
 263 {
 264         for (; ref; ref = ref->next) {
 265                 switch(ref->status) {
 266                 case REF_STATUS_NONE:
 267                 case REF_STATUS_UPTODATE:
 268                         break;
 269                 default:
 270                         return 1;
 271                 }
 272         }
 273         return 0;
 274 }
 275
 276 void transport_update_tracking_ref(struct remote *remote, struct ref *ref, int verbose)
 277 {
 278         struct refspec rs;
 279
 280         if (ref->status != REF_STATUS_OK && ref->status != REF_STATUS_UPTODATE)
 281                 return;
 282
 283         rs.src = ref->name;
 284         rs.dst = NULL;
 285
 286         if (!remote_find_tracking(remote, &rs)) {
 287                 if (verbose)
 288                         fprintf(stderr, "updating local tracking ref '%s'\n", rs.dst);
 289                 if (ref->deletion) {
 290                         delete_ref(rs.dst, NULL, 0);
 291                 } else
 292                         update_ref("update by push", rs.dst,
 293                                         ref->new_oid.hash, NULL, 0, 0);
 294                 free(rs.dst);
 295         }
 296 }
 297
 298 static void print_ref_status(char flag, const char *summary, struct ref *to, struct ref *from, const char *msg, int porcelain)
 299 {
 300         if (porcelain) {
 301                 if (from)
 302                         fprintf(stdout, "%c\t%s:%s\t", flag, from->name, to->name);
 303                 else
 304                         fprintf(stdout, "%c\t:%s\t", flag, to->name);
 305                 if (msg)
 306                         fprintf(stdout, "%s (%s)\n", summary, msg);
 307                 else
 308                         fprintf(stdout, "%s\n", summary);
 309         } else {
 310                 fprintf(stderr, " %c %-*s ", flag, TRANSPORT_SUMMARY_WIDTH, summary);
 311                 if (from)
 312                         fprintf(stderr, "%s -> %s", prettify_refname(from->name), prettify_refname(to->name));
 313                 else
 314                         fputs(prettify_refname(to->name), stderr);
 315                 if (msg) {
 316                         fputs(" (", stderr);
 317                         fputs(msg, stderr);
 318                         fputc(')', stderr);
 319                 }
 320                 fputc('\n', stderr);
 321         }
 322 }
 323
 324 static const char *status_abbrev(unsigned char sha1[20])
 325 {
 326         return find_unique_abbrev(sha1, DEFAULT_ABBREV);
 327 }
 328
 329 static void print_ok_ref_status(struct ref *ref, int porcelain)
 330 {
 331         if (ref->deletion)
 332                 print_ref_status('-', "[deleted]", ref, NULL, NULL, porcelain);
 333         else if (is_null_oid(&ref->old_oid))
 334                 print_ref_status('*',
 335                         (starts_with(ref->name, "refs/tags/") ? "[new tag]" :
 336                         "[new branch]"),
 337                         ref, ref->peer_ref, NULL, porcelain);
 338         else {
 339                 struct strbuf quickref = STRBUF_INIT;
 340                 char type;
 341                 const char *msg;
 342
 343                 strbuf_addstr(&quickref, status_abbrev(ref->old_oid.hash));
 344                 if (ref->forced_update) {
 345                         strbuf_addstr(&quickref, "...");
 346                         type = '+';
 347                         msg = "forced update";
 348                 } else {
 349                         strbuf_addstr(&quickref, "..");
 350                         type = ' ';
 351                         msg = NULL;
 352                 }
 353                 strbuf_addstr(&quickref, status_abbrev(ref->new_oid.hash));
 354
 355                 print_ref_status(type, quickref.buf, ref, ref->peer_ref, msg, porcelain);
 356                 strbuf_release(&quickref);
 357         }
 358 }
 359
 360 static int print_one_push_status(struct ref *ref, const char *dest, int count, int porcelain)
 361 {
 362         if (!count)
 363                 fprintf(porcelain ? stdout : stderr, "To %s\n", dest);
 364
 365         switch(ref->status) {
 366         case REF_STATUS_NONE:
 367                 print_ref_status('X', "[no match]", ref, NULL, NULL, porcelain);
 368                 break;
 369         case REF_STATUS_REJECT_NODELETE:
 370                 print_ref_status('!', "[rejected]", ref, NULL,
 371                                                  "remote does not support deleting refs", porcelain);
 372                 break;
 373         case REF_STATUS_UPTODATE:
 374                 print_ref_status('=', "[up to date]", ref,
 375                                                  ref->peer_ref, NULL, porcelain);
 376                 break;
 377         case REF_STATUS_REJECT_NONFASTFORWARD:
 378                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 379                                                  "non-fast-forward", porcelain);
 380                 break;
 381         case REF_STATUS_REJECT_ALREADY_EXISTS:
 382                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 383                                                  "already exists", porcelain);
 384                 break;
 385         case REF_STATUS_REJECT_FETCH_FIRST:
 386                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 387                                                  "fetch first", porcelain);
 388                 break;
 389         case REF_STATUS_REJECT_NEEDS_FORCE:
 390                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 391                                                  "needs force", porcelain);
 392                 break;
 393         case REF_STATUS_REJECT_STALE:
 394                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 395                                                  "stale info", porcelain);
 396                 break;
 397         case REF_STATUS_REJECT_SHALLOW:
 398                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 399                                                  "new shallow roots not allowed", porcelain);
 400                 break;
 401         case REF_STATUS_REMOTE_REJECT:
 402                 print_ref_status('!', "[remote rejected]", ref,
 403                                                  ref->deletion ? NULL : ref->peer_ref,
 404                                                  ref->remote_status, porcelain);
 405                 break;
 406         case REF_STATUS_EXPECTING_REPORT:
 407                 print_ref_status('!', "[remote failure]", ref,
 408                                                  ref->deletion ? NULL : ref->peer_ref,
 409                                                  "remote failed to report status", porcelain);
 410                 break;
 411         case REF_STATUS_ATOMIC_PUSH_FAILED:
 412                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 413                                                  "atomic push failed", porcelain);
 414                 break;
 415         case REF_STATUS_OK:
 416                 print_ok_ref_status(ref, porcelain);
 417                 break;
 418         }
 419
 420         return 1;
 421 }
 422
 423 void transport_print_push_status(const char *dest, struct ref *refs,
 424                                   int verbose, int porcelain, unsigned int *reject_reasons)
 425 {
 426         struct ref *ref;
 427         int n = 0;
 428         unsigned char head_sha1[20];
 429         char *head;
 430
 431         head = resolve_refdup("HEAD", RESOLVE_REF_READING, head_sha1, NULL);
 432
 433         if (verbose) {
 434                 for (ref = refs; ref; ref = ref->next)
 435                         if (ref->status == REF_STATUS_UPTODATE)
 436                                 n += print_one_push_status(ref, dest, n, porcelain);
 437         }
 438
 439         for (ref = refs; ref; ref = ref->next)
 440                 if (ref->status == REF_STATUS_OK)
 441                         n += print_one_push_status(ref, dest, n, porcelain);
 442
 443         *reject_reasons = 0;
 444         for (ref = refs; ref; ref = ref->next) {
 445                 if (ref->status != REF_STATUS_NONE &&
 446                     ref->status != REF_STATUS_UPTODATE &&
 447                     ref->status != REF_STATUS_OK)
 448                         n += print_one_push_status(ref, dest, n, porcelain);
 449                 if (ref->status == REF_STATUS_REJECT_NONFASTFORWARD) {
 450                         if (head != NULL && !strcmp(head, ref->name))
 451                                 *reject_reasons |= REJECT_NON_FF_HEAD;
 452                         else
 453                                 *reject_reasons |= REJECT_NON_FF_OTHER;
 454                 } else if (ref->status == REF_STATUS_REJECT_ALREADY_EXISTS) {
 455                         *reject_reasons |= REJECT_ALREADY_EXISTS;
 456                 } else if (ref->status == REF_STATUS_REJECT_FETCH_FIRST) {
 457                         *reject_reasons |= REJECT_FETCH_FIRST;
 458                 } else if (ref->status == REF_STATUS_REJECT_NEEDS_FORCE) {
 459                         *reject_reasons |= REJECT_NEEDS_FORCE;
 460                 }
 461         }
 462         free(head);
 463 }
 464
 465 void transport_verify_remote_names(int nr_heads, const char **heads)
 466 {
 467         int i;
 468
 469         for (i = 0; i < nr_heads; i++) {
 470                 const char *local = heads[i];
 471                 const char *remote = strrchr(heads[i], ':');
 472
 473                 if (*local == '+')
 474                         local++;
 475
 476                 /* A matching refspec is okay.  */
 477                 if (remote == local && remote[1] == '\0')
 478                         continue;
 479
 480                 remote = remote ? (remote + 1) : local;
 481                 if (check_refname_format(remote,
 482                                 REFNAME_ALLOW_ONELEVEL|REFNAME_REFSPEC_PATTERN))
 483                         die("remote part of refspec is not a valid name in %s",
 484                                 heads[i]);
 485         }
 486 }
 487
 488 static int git_transport_push(struct transport *transport, struct ref *remote_refs, int flags)
 489 {
 490         struct git_transport_data *data = transport->data;
 491         struct send_pack_args args;
 492         int ret;
 493
 494         if (!data->got_remote_heads) {
 495                 struct ref *tmp_refs;
 496                 connect_setup(transport, 1);
 497
 498                 get_remote_heads(data->fd[0], NULL, 0, &tmp_refs, REF_NORMAL,
 499                                  NULL, &data->shallow);
 500                 data->got_remote_heads = 1;
 501         }
 502
 503         memset(&args, 0, sizeof(args));
 504         args.send_mirror = !!(flags & TRANSPORT_PUSH_MIRROR);
 505         args.force_update = !!(flags & TRANSPORT_PUSH_FORCE);
 506         args.use_thin_pack = data->options.thin;
 507         args.verbose = (transport->verbose > 0);
 508         args.quiet = (transport->verbose < 0);
 509         args.progress = transport->progress;
 510         args.dry_run = !!(flags & TRANSPORT_PUSH_DRY_RUN);
 511         args.porcelain = !!(flags & TRANSPORT_PUSH_PORCELAIN);
 512         args.atomic = !!(flags & TRANSPORT_PUSH_ATOMIC);
 513         args.url = transport->url;
 514
 515         if (flags & TRANSPORT_PUSH_CERT_ALWAYS)
 516                 args.push_cert = SEND_PACK_PUSH_CERT_ALWAYS;
 517         else if (flags & TRANSPORT_PUSH_CERT_IF_ASKED)
 518                 args.push_cert = SEND_PACK_PUSH_CERT_IF_ASKED;
 519         else
 520                 args.push_cert = SEND_PACK_PUSH_CERT_NEVER;
 521
 522         ret = send_pack(&args, data->fd, data->conn, remote_refs,
 523                         &data->extra_have);
 524
 525         close(data->fd[1]);
 526         close(data->fd[0]);
 527         ret |= finish_connect(data->conn);
 528         data->conn = NULL;
 529         data->got_remote_heads = 0;
 530
 531         return ret;
 532 }
 533
 534 static int connect_git(struct transport *transport, const char *name,
 535                        const char *executable, int fd[2])
 536 {
 537         struct git_transport_data *data = transport->data;
 538         data->conn = git_connect(data->fd, transport->url,
 539                                  executable, 0);
 540         fd[0] = data->fd[0];
 541         fd[1] = data->fd[1];
 542         return 0;
 543 }
 544
 545 static int disconnect_git(struct transport *transport)
 546 {
 547         struct git_transport_data *data = transport->data;
 548         if (data->conn) {
 549                 if (data->got_remote_heads)
 550                         packet_flush(data->fd[1]);
 551                 close(data->fd[0]);
 552                 close(data->fd[1]);
 553                 finish_connect(data->conn);
 554         }
 555
 556         free(data);
 557         return 0;
 558 }
 559
 560 void transport_take_over(struct transport *transport,
 561                          struct child_process *child)
 562 {
 563         struct git_transport_data *data;
 564
 565         if (!transport->smart_options)
 566                 die("Bug detected: Taking over transport requires non-NULL "
 567                     "smart_options field.");
 568
 569         data = xcalloc(1, sizeof(*data));
 570         data->options = *transport->smart_options;
 571         data->conn = child;
 572         data->fd[0] = data->conn->out;
 573         data->fd[1] = data->conn->in;
 574         data->got_remote_heads = 0;
 575         transport->data = data;
 576
 577         transport->set_option = NULL;
 578         transport->get_refs_list = get_refs_via_connect;
 579         transport->fetch = fetch_refs_via_pack;
 580         transport->push = NULL;
 581         transport->push_refs = git_transport_push;
 582         transport->disconnect = disconnect_git;
 583         transport->smart_options = &(data->options);
 584
 585         transport->cannot_reuse = 1;
 586 }
 587
 588 static int is_file(const char *url)
 589 {
 590         struct stat buf;
 591         if (stat(url, &buf))
 592                 return 0;
 593         return S_ISREG(buf.st_mode);
 594 }
 595
 596 static int external_specification_len(const char *url)
 597 {
 598         return strchr(url, ':') - url;
 599 }
 600
 601 static const struct string_list *protocol_whitelist(void)
 602 {
 603         static int enabled = -1;
 604         static struct string_list allowed = STRING_LIST_INIT_DUP;
 605
 606         if (enabled < 0) {
 607                 const char *v = getenv("GIT_ALLOW_PROTOCOL");
 608                 if (v) {
 609                         string_list_split(&allowed, v, ':', -1);
 610                         string_list_sort(&allowed);
 611                         enabled = 1;
 612                 } else {
 613                         enabled = 0;
 614                 }
 615         }
 616
 617         return enabled ? &allowed : NULL;
 618 }
 619
 620 int is_transport_allowed(const char *type)
 621 {
 622         const struct string_list *allowed = protocol_whitelist();
 623         return !allowed || string_list_has_string(allowed, type);
 624 }
 625
 626 void transport_check_allowed(const char *type)
 627 {
 628         if (!is_transport_allowed(type))
 629                 die("transport '%s' not allowed", type);
 630 }
 631
 632 int transport_restrict_protocols(void)
 633 {
 634         return !!protocol_whitelist();
 635 }
 636
 637 struct transport *transport_get(struct remote *remote, const char *url)
 638 {
 639         const char *helper;
 640         struct transport *ret = xcalloc(1, sizeof(*ret));
 641
 642         ret->progress = isatty(2);
 643
 644         if (!remote)
 645                 die("No remote provided to transport_get()");
 646
 647         ret->got_remote_refs = 0;
 648         ret->remote = remote;
 649         helper = remote->foreign_vcs;
 650
 651         if (!url && remote->url)
 652                 url = remote->url[0];
 653         ret->url = url;
 654
 655         /* maybe it is a foreign URL? */
 656         if (url) {
 657                 const char *p = url;
 658
 659                 while (is_urlschemechar(p == url, *p))
 660                         p++;
 661                 if (starts_with(p, "::"))
 662                         helper = xstrndup(url, p - url);
 663         }
 664
 665         if (helper) {
 666                 transport_helper_init(ret, helper);
 667         } else if (starts_with(url, "rsync:")) {
 668                 die("git-over-rsync is no longer supported");
 669         } else if (url_is_local_not_ssh(url) && is_file(url) && is_bundle(url, 1)) {
 670                 struct bundle_transport_data *data = xcalloc(1, sizeof(*data));
 671                 transport_check_allowed("file");
 672                 ret->data = data;
 673                 ret->get_refs_list = get_refs_from_bundle;
 674                 ret->fetch = fetch_refs_from_bundle;
 675                 ret->disconnect = close_bundle;
 676                 ret->smart_options = NULL;
 677         } else if (!is_url(url)
 678                 || starts_with(url, "file://")
 679                 || starts_with(url, "git://")
 680                 || starts_with(url, "ssh://")
 681                 || starts_with(url, "git+ssh://") /* deprecated - do not use */
 682                 || starts_with(url, "ssh+git://") /* deprecated - do not use */
 683                 ) {
 684                 /*
 685                  * These are builtin smart transports; "allowed" transports
 686                  * will be checked individually in git_connect.
 687                  */
 688                 struct git_transport_data *data = xcalloc(1, sizeof(*data));
 689                 ret->data = data;
 690                 ret->set_option = NULL;
 691                 ret->get_refs_list = get_refs_via_connect;
 692                 ret->fetch = fetch_refs_via_pack;
 693                 ret->push_refs = git_transport_push;
 694                 ret->connect = connect_git;
 695                 ret->disconnect = disconnect_git;
 696                 ret->smart_options = &(data->options);
 697
 698                 data->conn = NULL;
 699                 data->got_remote_heads = 0;
 700         } else {
 701                 /* Unknown protocol in URL. Pass to external handler. */
 702                 int len = external_specification_len(url);
 703                 char *handler = xmemdupz(url, len);
 704                 transport_helper_init(ret, handler);
 705         }
 706
 707         if (ret->smart_options) {
 708                 ret->smart_options->thin = 1;
 709                 ret->smart_options->uploadpack = "git-upload-pack";
 710                 if (remote->uploadpack)
 711                         ret->smart_options->uploadpack = remote->uploadpack;
 712                 ret->smart_options->receivepack = "git-receive-pack";
 713                 if (remote->receivepack)
 714                         ret->smart_options->receivepack = remote->receivepack;
 715         }
 716
 717         return ret;
 718 }
 719
 720 int transport_set_option(struct transport *transport,
 721                          const char *name, const char *value)
 722 {
 723         int git_reports = 1, protocol_reports = 1;
 724
 725         if (transport->smart_options)
 726                 git_reports = set_git_option(transport->smart_options,
 727                                              name, value);
 728
 729         if (transport->set_option)
 730                 protocol_reports = transport->set_option(transport, name,
 731                                                         value);
 732
 733         /* If either report is 0, report 0 (success). */
 734         if (!git_reports || !protocol_reports)
 735                 return 0;
 736         /* If either reports -1 (invalid value), report -1. */
 737         if ((git_reports == -1) || (protocol_reports == -1))
 738                 return -1;
 739         /* Otherwise if both report unknown, report unknown. */
 740         return 1;
 741 }
 742
 743 void transport_set_verbosity(struct transport *transport, int verbosity,
 744         int force_progress)
 745 {
 746         if (verbosity >= 1)
 747                 transport->verbose = verbosity <= 3 ? verbosity : 3;
 748         if (verbosity < 0)
 749                 transport->verbose = -1;
 750
 751         /**
 752          * Rules used to determine whether to report progress (processing aborts
 753          * when a rule is satisfied):
 754          *
 755          *   . Report progress, if force_progress is 1 (ie. --progress).
 756          *   . Don't report progress, if force_progress is 0 (ie. --no-progress).
 757          *   . Don't report progress, if verbosity < 0 (ie. -q/--quiet ).
 758          *   . Report progress if isatty(2) is 1.
 759          **/
 760         if (force_progress >= 0)
 761                 transport->progress = !!force_progress;
 762         else
 763                 transport->progress = verbosity >= 0 && isatty(2);
 764 }
 765
 766 static void die_with_unpushed_submodules(struct string_list *needs_pushing)
 767 {
 768         int i;
 769
 770         fprintf(stderr, _("The following submodule paths contain changes that can\n"
 771                         "not be found on any remote:\n"));
 772         for (i = 0; i < needs_pushing->nr; i++)
 773                 printf("  %s\n", needs_pushing->items[i].string);
 774         fprintf(stderr, _("\nPlease try\n\n"
 775                           "     git push --recurse-submodules=on-demand\n\n"
 776                           "or cd to the path and use\n\n"
 777                           "     git push\n\n"
 778                           "to push them to a remote.\n\n"));
 779
 780         string_list_clear(needs_pushing, 0);
 781
 782         die(_("Aborting."));
 783 }
 784
 785 static int run_pre_push_hook(struct transport *transport,
 786                              struct ref *remote_refs)
 787 {
 788         int ret = 0, x;
 789         struct ref *r;
 790         struct child_process proc = CHILD_PROCESS_INIT;
 791         struct strbuf buf;
 792         const char *argv[4];
 793
 794         if (!(argv[0] = find_hook("pre-push")))
 795                 return 0;
 796
 797         argv[1] = transport->remote->name;
 798         argv[2] = transport->url;
 799         argv[3] = NULL;
 800
 801         proc.argv = argv;
 802         proc.in = -1;
 803
 804         if (start_command(&proc)) {
 805                 finish_command(&proc);
 806                 return -1;
 807         }
 808
 809         sigchain_push(SIGPIPE, SIG_IGN);
 810
 811         strbuf_init(&buf, 256);
 812
 813         for (r = remote_refs; r; r = r->next) {
 814                 if (!r->peer_ref) continue;
 815                 if (r->status == REF_STATUS_REJECT_NONFASTFORWARD) continue;
 816                 if (r->status == REF_STATUS_REJECT_STALE) continue;
 817                 if (r->status == REF_STATUS_UPTODATE) continue;
 818
 819                 strbuf_reset(&buf);
 820                 strbuf_addf( &buf, "%s %s %s %s\n",
 821                          r->peer_ref->name, oid_to_hex(&r->new_oid),
 822                          r->name, oid_to_hex(&r->old_oid));
 823
 824                 if (write_in_full(proc.in, buf.buf, buf.len) < 0) {
 825                         /* We do not mind if a hook does not read all refs. */
 826                         if (errno != EPIPE)
 827                                 ret = -1;
 828                         break;
 829                 }
 830         }
 831
 832         strbuf_release(&buf);
 833
 834         x = close(proc.in);
 835         if (!ret)
 836                 ret = x;
 837
 838         sigchain_pop(SIGPIPE);
 839
 840         x = finish_command(&proc);
 841         if (!ret)
 842                 ret = x;
 843
 844         return ret;
 845 }
 846
 847 int transport_push(struct transport *transport,
 848                    int refspec_nr, const char **refspec, int flags,
 849                    unsigned int *reject_reasons)
 850 {
 851         *reject_reasons = 0;
 852         transport_verify_remote_names(refspec_nr, refspec);
 853
 854         if (transport->push) {
 855                 /* Maybe FIXME. But no important transport uses this case. */
 856                 if (flags & TRANSPORT_PUSH_SET_UPSTREAM)
 857                         die("This transport does not support using --set-upstream");
 858
 859                 return transport->push(transport, refspec_nr, refspec, flags);
 860         } else if (transport->push_refs) {
 861                 struct ref *remote_refs;
 862                 struct ref *local_refs = get_local_heads();
 863                 int match_flags = MATCH_REFS_NONE;
 864                 int verbose = (transport->verbose > 0);
 865                 int quiet = (transport->verbose < 0);
 866                 int porcelain = flags & TRANSPORT_PUSH_PORCELAIN;
 867                 int pretend = flags & TRANSPORT_PUSH_DRY_RUN;
 868                 int push_ret, ret, err;
 869
 870                 if (check_push_refs(local_refs, refspec_nr, refspec) < 0)
 871                         return -1;
 872
 873                 remote_refs = transport->get_refs_list(transport, 1);
 874
 875                 if (flags & TRANSPORT_PUSH_ALL)
 876                         match_flags |= MATCH_REFS_ALL;
 877                 if (flags & TRANSPORT_PUSH_MIRROR)
 878                         match_flags |= MATCH_REFS_MIRROR;
 879                 if (flags & TRANSPORT_PUSH_PRUNE)
 880                         match_flags |= MATCH_REFS_PRUNE;
 881                 if (flags & TRANSPORT_PUSH_FOLLOW_TAGS)
 882                         match_flags |= MATCH_REFS_FOLLOW_TAGS;
 883
 884                 if (match_push_refs(local_refs, &remote_refs,
 885                                     refspec_nr, refspec, match_flags)) {
 886                         return -1;
 887                 }
 888
 889                 if (transport->smart_options &&
 890                     transport->smart_options->cas &&
 891                     !is_empty_cas(transport->smart_options->cas))
 892                         apply_push_cas(transport->smart_options->cas,
 893                                        transport->remote, remote_refs);
 894
 895                 set_ref_status_for_push(remote_refs,
 896                         flags & TRANSPORT_PUSH_MIRROR,
 897                         flags & TRANSPORT_PUSH_FORCE);
 898
 899                 if (!(flags & TRANSPORT_PUSH_NO_HOOK))
 900                         if (run_pre_push_hook(transport, remote_refs))
 901                                 return -1;
 902
 903                 if ((flags & TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND) && !is_bare_repository()) {
 904                         struct ref *ref = remote_refs;
 905                         for (; ref; ref = ref->next)
 906                                 if (!is_null_oid(&ref->new_oid) &&
 907                                     !push_unpushed_submodules(ref->new_oid.hash,
 908                                             transport->remote->name))
 909                                     die ("Failed to push all needed submodules!");
 910                 }
 911
 912                 if ((flags & (TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND |
 913                               TRANSPORT_RECURSE_SUBMODULES_CHECK)) && !is_bare_repository()) {
 914                         struct ref *ref = remote_refs;
 915                         struct string_list needs_pushing = STRING_LIST_INIT_DUP;
 916
 917                         for (; ref; ref = ref->next)
 918                                 if (!is_null_oid(&ref->new_oid) &&
 919                                     find_unpushed_submodules(ref->new_oid.hash,
 920                                             transport->remote->name, &needs_pushing))
 921                                         die_with_unpushed_submodules(&needs_pushing);
 922                 }
 923
 924                 push_ret = transport->push_refs(transport, remote_refs, flags);
 925                 err = push_had_errors(remote_refs);
 926                 ret = push_ret | err;
 927
 928                 if (!quiet || err)
 929                         transport_print_push_status(transport->url, remote_refs,
 930                                         verbose | porcelain, porcelain,
 931                                         reject_reasons);
 932
 933                 if (flags & TRANSPORT_PUSH_SET_UPSTREAM)
 934                         set_upstreams(transport, remote_refs, pretend);
 935
 936                 if (!(flags & TRANSPORT_PUSH_DRY_RUN)) {
 937                         struct ref *ref;
 938                         for (ref = remote_refs; ref; ref = ref->next)
 939                                 transport_update_tracking_ref(transport->remote, ref, verbose);
 940                 }
 941
 942                 if (porcelain && !push_ret)
 943                         puts("Done");
 944                 else if (!quiet && !ret && !transport_refs_pushed(remote_refs))
 945                         fprintf(stderr, "Everything up-to-date\n");
 946
 947                 return ret;
 948         }
 949         return 1;
 950 }
 951
 952 const struct ref *transport_get_remote_refs(struct transport *transport)
 953 {
 954         if (!transport->got_remote_refs) {
 955                 transport->remote_refs = transport->get_refs_list(transport, 0);
 956                 transport->got_remote_refs = 1;
 957         }
 958
 959         return transport->remote_refs;
 960 }
 961
 962 int transport_fetch_refs(struct transport *transport, struct ref *refs)
 963 {
 964         int rc;
 965         int nr_heads = 0, nr_alloc = 0, nr_refs = 0;
 966         struct ref **heads = NULL;
 967         struct ref *rm;
 968
 969         for (rm = refs; rm; rm = rm->next) {
 970                 nr_refs++;
 971                 if (rm->peer_ref &&
 972                     !is_null_oid(&rm->old_oid) &&
 973                     !oidcmp(&rm->peer_ref->old_oid, &rm->old_oid))
 974                         continue;
 975                 ALLOC_GROW(heads, nr_heads + 1, nr_alloc);
 976                 heads[nr_heads++] = rm;
 977         }
 978
 979         if (!nr_heads) {
 980                 /*
 981                  * When deepening of a shallow repository is requested,
 982                  * then local and remote refs are likely to still be equal.
 983                  * Just feed them all to the fetch method in that case.
 984                  * This condition shouldn't be met in a non-deepening fetch
 985                  * (see builtin/fetch.c:quickfetch()).
 986                  */
 987                 ALLOC_ARRAY(heads, nr_refs);
 988                 for (rm = refs; rm; rm = rm->next)
 989                         heads[nr_heads++] = rm;
 990         }
 991
 992         rc = transport->fetch(transport, nr_heads, heads);
 993
 994         free(heads);
 995         return rc;
 996 }
 997
 998 void transport_unlock_pack(struct transport *transport)
 999 {
1000         if (transport->pack_lockfile) {
1001                 unlink_or_warn(transport->pack_lockfile);
1002                 free(transport->pack_lockfile);
1003                 transport->pack_lockfile = NULL;
1004         }
1005 }
1006
1007 int transport_connect(struct transport *transport, const char *name,
1008                       const char *exec, int fd[2])
1009 {
1010         if (transport->connect)
1011                 return transport->connect(transport, name, exec, fd);
1012         else
1013                 die("Operation not supported by protocol");
1014 }
1015
1016 int transport_disconnect(struct transport *transport)
1017 {
1018         int ret = 0;
1019         if (transport->disconnect)
1020                 ret = transport->disconnect(transport);
1021         free(transport);
1022         return ret;
1023 }
1024
1025 /*
1026  * Strip username (and password) from a URL and return
1027  * it in a newly allocated string.
1028  */
1029 char *transport_anonymize_url(const char *url)
1030 {
1031         char *scheme_prefix, *anon_part;
1032         size_t anon_len, prefix_len = 0;
1033
1034         anon_part = strchr(url, '@');
1035         if (url_is_local_not_ssh(url) || !anon_part)
1036                 goto literal_copy;
1037
1038         anon_len = strlen(++anon_part);
1039         scheme_prefix = strstr(url, "://");
1040         if (!scheme_prefix) {
1041                 if (!strchr(anon_part, ':'))
1042                         /* cannot be "me@there:/path/name" */
1043                         goto literal_copy;
1044         } else {
1045                 const char *cp;
1046                 /* make sure scheme is reasonable */
1047                 for (cp = url; cp < scheme_prefix; cp++) {
1048                         switch (*cp) {
1049                                 /* RFC 1738 2.1 */
1050                         case '+': case '.': case '-':
1051                                 break; /* ok */
1052                         default:
1053                                 if (isalnum(*cp))
1054                                         break;
1055                                 /* it isn't */
1056                                 goto literal_copy;
1057                         }
1058                 }
1059                 /* @ past the first slash does not count */
1060                 cp = strchr(scheme_prefix + 3, '/');
1061                 if (cp && cp < anon_part)
1062                         goto literal_copy;
1063                 prefix_len = scheme_prefix - url + 3;
1064         }
1065         return xstrfmt("%.*s%.*s", (int)prefix_len, url,
1066                        (int)anon_len, anon_part);
1067 literal_copy:
1068         return xstrdup(url);
1069 }
1070
1071 struct alternate_refs_data {
1072         alternate_ref_fn *fn;
1073         void *data;
1074 };
1075
1076 static int refs_from_alternate_cb(struct alternate_object_database *e,
1077                                   void *data)
1078 {
1079         char *other;
1080         size_t len;
1081         struct remote *remote;
1082         struct transport *transport;
1083         const struct ref *extra;
1084         struct alternate_refs_data *cb = data;
1085
1086         e->name[-1] = '\0';
1087         other = xstrdup(real_path(e->base));
1088         e->name[-1] = '/';
1089         len = strlen(other);
1090
1091         while (other[len-1] == '/')
1092                 other[--len] = '\0';
1093         if (len < 8 || memcmp(other + len - 8, "/objects", 8))
1094                 goto out;
1095         /* Is this a git repository with refs? */
1096         memcpy(other + len - 8, "/refs", 6);
1097         if (!is_directory(other))
1098                 goto out;
1099         other[len - 8] = '\0';
1100         remote = remote_get(other);
1101         transport = transport_get(remote, other);
1102         for (extra = transport_get_remote_refs(transport);
1103              extra;
1104              extra = extra->next)
1105                 cb->fn(extra, cb->data);
1106         transport_disconnect(transport);
1107 out:
1108         free(other);
1109         return 0;
1110 }
1111
1112 void for_each_alternate_ref(alternate_ref_fn fn, void *data)
1113 {
1114         struct alternate_refs_data cb;
1115         cb.fn = fn;
1116         cb.data = data;
1117         foreach_alt_odb(refs_from_alternate_cb, &cb);
1118 }