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