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