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,
 299                              struct ref *to, struct ref *from, const char *msg,
 300                              int porcelain, int summary_width)
 301 {
 302         if (porcelain) {
 303                 if (from)
 304                         fprintf(stdout, "%c\t%s:%s\t", flag, from->name, to->name);
 305                 else
 306                         fprintf(stdout, "%c\t:%s\t", flag, to->name);
 307                 if (msg)
 308                         fprintf(stdout, "%s (%s)\n", summary, msg);
 309                 else
 310                         fprintf(stdout, "%s\n", summary);
 311         } else {
 312                 fprintf(stderr, " %c %-*s ", flag, summary_width, summary);
 313                 if (from)
 314                         fprintf(stderr, "%s -> %s", prettify_refname(from->name), prettify_refname(to->name));
 315                 else
 316                         fputs(prettify_refname(to->name), stderr);
 317                 if (msg) {
 318                         fputs(" (", stderr);
 319                         fputs(msg, stderr);
 320                         fputc(')', stderr);
 321                 }
 322                 fputc('\n', stderr);
 323         }
 324 }
 325
 326 static void print_ok_ref_status(struct ref *ref, int porcelain, int summary_width)
 327 {
 328         if (ref->deletion)
 329                 print_ref_status('-', "[deleted]", ref, NULL, NULL,
 330                                  porcelain, summary_width);
 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, summary_width);
 336         else {
 337                 struct strbuf quickref = STRBUF_INIT;
 338                 char type;
 339                 const char *msg;
 340
 341                 strbuf_add_unique_abbrev(&quickref, ref->old_oid.hash,
 342                                          DEFAULT_ABBREV);
 343                 if (ref->forced_update) {
 344                         strbuf_addstr(&quickref, "...");
 345                         type = '+';
 346                         msg = "forced update";
 347                 } else {
 348                         strbuf_addstr(&quickref, "..");
 349                         type = ' ';
 350                         msg = NULL;
 351                 }
 352                 strbuf_add_unique_abbrev(&quickref, ref->new_oid.hash,
 353                                          DEFAULT_ABBREV);
 354
 355                 print_ref_status(type, quickref.buf, ref, ref->peer_ref, msg,
 356                                  porcelain, summary_width);
 357                 strbuf_release(&quickref);
 358         }
 359 }
 360
 361 static int print_one_push_status(struct ref *ref, const char *dest, int count,
 362                                  int porcelain, int summary_width)
 363 {
 364         if (!count) {
 365                 char *url = transport_anonymize_url(dest);
 366                 fprintf(porcelain ? stdout : stderr, "To %s\n", url);
 367                 free(url);
 368         }
 369
 370         switch(ref->status) {
 371         case REF_STATUS_NONE:
 372                 print_ref_status('X', "[no match]", ref, NULL, NULL,
 373                                  porcelain, summary_width);
 374                 break;
 375         case REF_STATUS_REJECT_NODELETE:
 376                 print_ref_status('!', "[rejected]", ref, NULL,
 377                                  "remote does not support deleting refs",
 378                                  porcelain, summary_width);
 379                 break;
 380         case REF_STATUS_UPTODATE:
 381                 print_ref_status('=', "[up to date]", ref,
 382                                  ref->peer_ref, NULL, porcelain, summary_width);
 383                 break;
 384         case REF_STATUS_REJECT_NONFASTFORWARD:
 385                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 386                                  "non-fast-forward", porcelain, summary_width);
 387                 break;
 388         case REF_STATUS_REJECT_ALREADY_EXISTS:
 389                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 390                                  "already exists", porcelain, summary_width);
 391                 break;
 392         case REF_STATUS_REJECT_FETCH_FIRST:
 393                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 394                                  "fetch first", porcelain, summary_width);
 395                 break;
 396         case REF_STATUS_REJECT_NEEDS_FORCE:
 397                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 398                                  "needs force", porcelain, summary_width);
 399                 break;
 400         case REF_STATUS_REJECT_STALE:
 401                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 402                                  "stale info", porcelain, summary_width);
 403                 break;
 404         case REF_STATUS_REJECT_SHALLOW:
 405                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 406                                  "new shallow roots not allowed",
 407                                  porcelain, summary_width);
 408                 break;
 409         case REF_STATUS_REMOTE_REJECT:
 410                 print_ref_status('!', "[remote rejected]", ref,
 411                                  ref->deletion ? NULL : ref->peer_ref,
 412                                  ref->remote_status, porcelain, summary_width);
 413                 break;
 414         case REF_STATUS_EXPECTING_REPORT:
 415                 print_ref_status('!', "[remote failure]", ref,
 416                                  ref->deletion ? NULL : ref->peer_ref,
 417                                  "remote failed to report status",
 418                                  porcelain, summary_width);
 419                 break;
 420         case REF_STATUS_ATOMIC_PUSH_FAILED:
 421                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 422                                  "atomic push failed", porcelain, summary_width);
 423                 break;
 424         case REF_STATUS_OK:
 425                 print_ok_ref_status(ref, porcelain, summary_width);
 426                 break;
 427         }
 428
 429         return 1;
 430 }
 431
 432 void transport_print_push_status(const char *dest, struct ref *refs,
 433                                   int verbose, int porcelain, unsigned int *reject_reasons)
 434 {
 435         struct ref *ref;
 436         int n = 0;
 437         unsigned char head_sha1[20];
 438         char *head;
 439         int summary_width = TRANSPORT_SUMMARY_WIDTH;
 440
 441         head = resolve_refdup("HEAD", RESOLVE_REF_READING, head_sha1, NULL);
 442
 443         if (verbose) {
 444                 for (ref = refs; ref; ref = ref->next)
 445                         if (ref->status == REF_STATUS_UPTODATE)
 446                                 n += print_one_push_status(ref, dest, n,
 447                                                            porcelain, summary_width);
 448         }
 449
 450         for (ref = refs; ref; ref = ref->next)
 451                 if (ref->status == REF_STATUS_OK)
 452                         n += print_one_push_status(ref, dest, n,
 453                                                    porcelain, summary_width);
 454
 455         *reject_reasons = 0;
 456         for (ref = refs; ref; ref = ref->next) {
 457                 if (ref->status != REF_STATUS_NONE &&
 458                     ref->status != REF_STATUS_UPTODATE &&
 459                     ref->status != REF_STATUS_OK)
 460                         n += print_one_push_status(ref, dest, n,
 461                                                    porcelain, summary_width);
 462                 if (ref->status == REF_STATUS_REJECT_NONFASTFORWARD) {
 463                         if (head != NULL && !strcmp(head, ref->name))
 464                                 *reject_reasons |= REJECT_NON_FF_HEAD;
 465                         else
 466                                 *reject_reasons |= REJECT_NON_FF_OTHER;
 467                 } else if (ref->status == REF_STATUS_REJECT_ALREADY_EXISTS) {
 468                         *reject_reasons |= REJECT_ALREADY_EXISTS;
 469                 } else if (ref->status == REF_STATUS_REJECT_FETCH_FIRST) {
 470                         *reject_reasons |= REJECT_FETCH_FIRST;
 471                 } else if (ref->status == REF_STATUS_REJECT_NEEDS_FORCE) {
 472                         *reject_reasons |= REJECT_NEEDS_FORCE;
 473                 }
 474         }
 475         free(head);
 476 }
 477
 478 void transport_verify_remote_names(int nr_heads, const char **heads)
 479 {
 480         int i;
 481
 482         for (i = 0; i < nr_heads; i++) {
 483                 const char *local = heads[i];
 484                 const char *remote = strrchr(heads[i], ':');
 485
 486                 if (*local == '+')
 487                         local++;
 488
 489                 /* A matching refspec is okay.  */
 490                 if (remote == local && remote[1] == '\0')
 491                         continue;
 492
 493                 remote = remote ? (remote + 1) : local;
 494                 if (check_refname_format(remote,
 495                                 REFNAME_ALLOW_ONELEVEL|REFNAME_REFSPEC_PATTERN))
 496                         die("remote part of refspec is not a valid name in %s",
 497                                 heads[i]);
 498         }
 499 }
 500
 501 static int git_transport_push(struct transport *transport, struct ref *remote_refs, int flags)
 502 {
 503         struct git_transport_data *data = transport->data;
 504         struct send_pack_args args;
 505         int ret;
 506
 507         if (!data->got_remote_heads) {
 508                 struct ref *tmp_refs;
 509                 connect_setup(transport, 1);
 510
 511                 get_remote_heads(data->fd[0], NULL, 0, &tmp_refs, REF_NORMAL,
 512                                  NULL, &data->shallow);
 513                 data->got_remote_heads = 1;
 514         }
 515
 516         memset(&args, 0, sizeof(args));
 517         args.send_mirror = !!(flags & TRANSPORT_PUSH_MIRROR);
 518         args.force_update = !!(flags & TRANSPORT_PUSH_FORCE);
 519         args.use_thin_pack = data->options.thin;
 520         args.verbose = (transport->verbose > 0);
 521         args.quiet = (transport->verbose < 0);
 522         args.progress = transport->progress;
 523         args.dry_run = !!(flags & TRANSPORT_PUSH_DRY_RUN);
 524         args.porcelain = !!(flags & TRANSPORT_PUSH_PORCELAIN);
 525         args.atomic = !!(flags & TRANSPORT_PUSH_ATOMIC);
 526         args.push_options = transport->push_options;
 527         args.url = transport->url;
 528
 529         if (flags & TRANSPORT_PUSH_CERT_ALWAYS)
 530                 args.push_cert = SEND_PACK_PUSH_CERT_ALWAYS;
 531         else if (flags & TRANSPORT_PUSH_CERT_IF_ASKED)
 532                 args.push_cert = SEND_PACK_PUSH_CERT_IF_ASKED;
 533         else
 534                 args.push_cert = SEND_PACK_PUSH_CERT_NEVER;
 535
 536         ret = send_pack(&args, data->fd, data->conn, remote_refs,
 537                         &data->extra_have);
 538
 539         close(data->fd[1]);
 540         close(data->fd[0]);
 541         ret |= finish_connect(data->conn);
 542         data->conn = NULL;
 543         data->got_remote_heads = 0;
 544
 545         return ret;
 546 }
 547
 548 static int connect_git(struct transport *transport, const char *name,
 549                        const char *executable, int fd[2])
 550 {
 551         struct git_transport_data *data = transport->data;
 552         data->conn = git_connect(data->fd, transport->url,
 553                                  executable, 0);
 554         fd[0] = data->fd[0];
 555         fd[1] = data->fd[1];
 556         return 0;
 557 }
 558
 559 static int disconnect_git(struct transport *transport)
 560 {
 561         struct git_transport_data *data = transport->data;
 562         if (data->conn) {
 563                 if (data->got_remote_heads)
 564                         packet_flush(data->fd[1]);
 565                 close(data->fd[0]);
 566                 close(data->fd[1]);
 567                 finish_connect(data->conn);
 568         }
 569
 570         free(data);
 571         return 0;
 572 }
 573
 574 void transport_take_over(struct transport *transport,
 575                          struct child_process *child)
 576 {
 577         struct git_transport_data *data;
 578
 579         if (!transport->smart_options)
 580                 die("BUG: taking over transport requires non-NULL "
 581                     "smart_options field.");
 582
 583         data = xcalloc(1, sizeof(*data));
 584         data->options = *transport->smart_options;
 585         data->conn = child;
 586         data->fd[0] = data->conn->out;
 587         data->fd[1] = data->conn->in;
 588         data->got_remote_heads = 0;
 589         transport->data = data;
 590
 591         transport->set_option = NULL;
 592         transport->get_refs_list = get_refs_via_connect;
 593         transport->fetch = fetch_refs_via_pack;
 594         transport->push = NULL;
 595         transport->push_refs = git_transport_push;
 596         transport->disconnect = disconnect_git;
 597         transport->smart_options = &(data->options);
 598
 599         transport->cannot_reuse = 1;
 600 }
 601
 602 static int is_file(const char *url)
 603 {
 604         struct stat buf;
 605         if (stat(url, &buf))
 606                 return 0;
 607         return S_ISREG(buf.st_mode);
 608 }
 609
 610 static int external_specification_len(const char *url)
 611 {
 612         return strchr(url, ':') - url;
 613 }
 614
 615 static const struct string_list *protocol_whitelist(void)
 616 {
 617         static int enabled = -1;
 618         static struct string_list allowed = STRING_LIST_INIT_DUP;
 619
 620         if (enabled < 0) {
 621                 const char *v = getenv("GIT_ALLOW_PROTOCOL");
 622                 if (v) {
 623                         string_list_split(&allowed, v, ':', -1);
 624                         string_list_sort(&allowed);
 625                         enabled = 1;
 626                 } else {
 627                         enabled = 0;
 628                 }
 629         }
 630
 631         return enabled ? &allowed : NULL;
 632 }
 633
 634 int is_transport_allowed(const char *type)
 635 {
 636         const struct string_list *allowed = protocol_whitelist();
 637         return !allowed || string_list_has_string(allowed, type);
 638 }
 639
 640 void transport_check_allowed(const char *type)
 641 {
 642         if (!is_transport_allowed(type))
 643                 die("transport '%s' not allowed", type);
 644 }
 645
 646 int transport_restrict_protocols(void)
 647 {
 648         return !!protocol_whitelist();
 649 }
 650
 651 struct transport *transport_get(struct remote *remote, const char *url)
 652 {
 653         const char *helper;
 654         struct transport *ret = xcalloc(1, sizeof(*ret));
 655
 656         ret->progress = isatty(2);
 657
 658         if (!remote)
 659                 die("No remote provided to transport_get()");
 660
 661         ret->got_remote_refs = 0;
 662         ret->remote = remote;
 663         helper = remote->foreign_vcs;
 664
 665         if (!url && remote->url)
 666                 url = remote->url[0];
 667         ret->url = url;
 668
 669         /* maybe it is a foreign URL? */
 670         if (url) {
 671                 const char *p = url;
 672
 673                 while (is_urlschemechar(p == url, *p))
 674                         p++;
 675                 if (starts_with(p, "::"))
 676                         helper = xstrndup(url, p - url);
 677         }
 678
 679         if (helper) {
 680                 transport_helper_init(ret, helper);
 681         } else if (starts_with(url, "rsync:")) {
 682                 die("git-over-rsync is no longer supported");
 683         } else if (url_is_local_not_ssh(url) && is_file(url) && is_bundle(url, 1)) {
 684                 struct bundle_transport_data *data = xcalloc(1, sizeof(*data));
 685                 transport_check_allowed("file");
 686                 ret->data = data;
 687                 ret->get_refs_list = get_refs_from_bundle;
 688                 ret->fetch = fetch_refs_from_bundle;
 689                 ret->disconnect = close_bundle;
 690                 ret->smart_options = NULL;
 691         } else if (!is_url(url)
 692                 || starts_with(url, "file://")
 693                 || starts_with(url, "git://")
 694                 || starts_with(url, "ssh://")
 695                 || starts_with(url, "git+ssh://") /* deprecated - do not use */
 696                 || starts_with(url, "ssh+git://") /* deprecated - do not use */
 697                 ) {
 698                 /*
 699                  * These are builtin smart transports; "allowed" transports
 700                  * will be checked individually in git_connect.
 701                  */
 702                 struct git_transport_data *data = xcalloc(1, sizeof(*data));
 703                 ret->data = data;
 704                 ret->set_option = NULL;
 705                 ret->get_refs_list = get_refs_via_connect;
 706                 ret->fetch = fetch_refs_via_pack;
 707                 ret->push_refs = git_transport_push;
 708                 ret->connect = connect_git;
 709                 ret->disconnect = disconnect_git;
 710                 ret->smart_options = &(data->options);
 711
 712                 data->conn = NULL;
 713                 data->got_remote_heads = 0;
 714         } else {
 715                 /* Unknown protocol in URL. Pass to external handler. */
 716                 int len = external_specification_len(url);
 717                 char *handler = xmemdupz(url, len);
 718                 transport_helper_init(ret, handler);
 719         }
 720
 721         if (ret->smart_options) {
 722                 ret->smart_options->thin = 1;
 723                 ret->smart_options->uploadpack = "git-upload-pack";
 724                 if (remote->uploadpack)
 725                         ret->smart_options->uploadpack = remote->uploadpack;
 726                 ret->smart_options->receivepack = "git-receive-pack";
 727                 if (remote->receivepack)
 728                         ret->smart_options->receivepack = remote->receivepack;
 729         }
 730
 731         return ret;
 732 }
 733
 734 int transport_set_option(struct transport *transport,
 735                          const char *name, const char *value)
 736 {
 737         int git_reports = 1, protocol_reports = 1;
 738
 739         if (transport->smart_options)
 740                 git_reports = set_git_option(transport->smart_options,
 741                                              name, value);
 742
 743         if (transport->set_option)
 744                 protocol_reports = transport->set_option(transport, name,
 745                                                         value);
 746
 747         /* If either report is 0, report 0 (success). */
 748         if (!git_reports || !protocol_reports)
 749                 return 0;
 750         /* If either reports -1 (invalid value), report -1. */
 751         if ((git_reports == -1) || (protocol_reports == -1))
 752                 return -1;
 753         /* Otherwise if both report unknown, report unknown. */
 754         return 1;
 755 }
 756
 757 void transport_set_verbosity(struct transport *transport, int verbosity,
 758         int force_progress)
 759 {
 760         if (verbosity >= 1)
 761                 transport->verbose = verbosity <= 3 ? verbosity : 3;
 762         if (verbosity < 0)
 763                 transport->verbose = -1;
 764
 765         /**
 766          * Rules used to determine whether to report progress (processing aborts
 767          * when a rule is satisfied):
 768          *
 769          *   . Report progress, if force_progress is 1 (ie. --progress).
 770          *   . Don't report progress, if force_progress is 0 (ie. --no-progress).
 771          *   . Don't report progress, if verbosity < 0 (ie. -q/--quiet ).
 772          *   . Report progress if isatty(2) is 1.
 773          **/
 774         if (force_progress >= 0)
 775                 transport->progress = !!force_progress;
 776         else
 777                 transport->progress = verbosity >= 0 && isatty(2);
 778 }
 779
 780 static void die_with_unpushed_submodules(struct string_list *needs_pushing)
 781 {
 782         int i;
 783
 784         fprintf(stderr, _("The following submodule paths contain changes that can\n"
 785                         "not be found on any remote:\n"));
 786         for (i = 0; i < needs_pushing->nr; i++)
 787                 fprintf(stderr, "  %s\n", needs_pushing->items[i].string);
 788         fprintf(stderr, _("\nPlease try\n\n"
 789                           "     git push --recurse-submodules=on-demand\n\n"
 790                           "or cd to the path and use\n\n"
 791                           "     git push\n\n"
 792                           "to push them to a remote.\n\n"));
 793
 794         string_list_clear(needs_pushing, 0);
 795
 796         die(_("Aborting."));
 797 }
 798
 799 static int run_pre_push_hook(struct transport *transport,
 800                              struct ref *remote_refs)
 801 {
 802         int ret = 0, x;
 803         struct ref *r;
 804         struct child_process proc = CHILD_PROCESS_INIT;
 805         struct strbuf buf;
 806         const char *argv[4];
 807
 808         if (!(argv[0] = find_hook("pre-push")))
 809                 return 0;
 810
 811         argv[1] = transport->remote->name;
 812         argv[2] = transport->url;
 813         argv[3] = NULL;
 814
 815         proc.argv = argv;
 816         proc.in = -1;
 817
 818         if (start_command(&proc)) {
 819                 finish_command(&proc);
 820                 return -1;
 821         }
 822
 823         sigchain_push(SIGPIPE, SIG_IGN);
 824
 825         strbuf_init(&buf, 256);
 826
 827         for (r = remote_refs; r; r = r->next) {
 828                 if (!r->peer_ref) continue;
 829                 if (r->status == REF_STATUS_REJECT_NONFASTFORWARD) continue;
 830                 if (r->status == REF_STATUS_REJECT_STALE) continue;
 831                 if (r->status == REF_STATUS_UPTODATE) continue;
 832
 833                 strbuf_reset(&buf);
 834                 strbuf_addf( &buf, "%s %s %s %s\n",
 835                          r->peer_ref->name, oid_to_hex(&r->new_oid),
 836                          r->name, oid_to_hex(&r->old_oid));
 837
 838                 if (write_in_full(proc.in, buf.buf, buf.len) < 0) {
 839                         /* We do not mind if a hook does not read all refs. */
 840                         if (errno != EPIPE)
 841                                 ret = -1;
 842                         break;
 843                 }
 844         }
 845
 846         strbuf_release(&buf);
 847
 848         x = close(proc.in);
 849         if (!ret)
 850                 ret = x;
 851
 852         sigchain_pop(SIGPIPE);
 853
 854         x = finish_command(&proc);
 855         if (!ret)
 856                 ret = x;
 857
 858         return ret;
 859 }
 860
 861 int transport_push(struct transport *transport,
 862                    int refspec_nr, const char **refspec, int flags,
 863                    unsigned int *reject_reasons)
 864 {
 865         *reject_reasons = 0;
 866         transport_verify_remote_names(refspec_nr, refspec);
 867
 868         if (transport->push) {
 869                 /* Maybe FIXME. But no important transport uses this case. */
 870                 if (flags & TRANSPORT_PUSH_SET_UPSTREAM)
 871                         die("This transport does not support using --set-upstream");
 872
 873                 return transport->push(transport, refspec_nr, refspec, flags);
 874         } else if (transport->push_refs) {
 875                 struct ref *remote_refs;
 876                 struct ref *local_refs = get_local_heads();
 877                 int match_flags = MATCH_REFS_NONE;
 878                 int verbose = (transport->verbose > 0);
 879                 int quiet = (transport->verbose < 0);
 880                 int porcelain = flags & TRANSPORT_PUSH_PORCELAIN;
 881                 int pretend = flags & TRANSPORT_PUSH_DRY_RUN;
 882                 int push_ret, ret, err;
 883
 884                 if (check_push_refs(local_refs, refspec_nr, refspec) < 0)
 885                         return -1;
 886
 887                 remote_refs = transport->get_refs_list(transport, 1);
 888
 889                 if (flags & TRANSPORT_PUSH_ALL)
 890                         match_flags |= MATCH_REFS_ALL;
 891                 if (flags & TRANSPORT_PUSH_MIRROR)
 892                         match_flags |= MATCH_REFS_MIRROR;
 893                 if (flags & TRANSPORT_PUSH_PRUNE)
 894                         match_flags |= MATCH_REFS_PRUNE;
 895                 if (flags & TRANSPORT_PUSH_FOLLOW_TAGS)
 896                         match_flags |= MATCH_REFS_FOLLOW_TAGS;
 897
 898                 if (match_push_refs(local_refs, &remote_refs,
 899                                     refspec_nr, refspec, match_flags)) {
 900                         return -1;
 901                 }
 902
 903                 if (transport->smart_options &&
 904                     transport->smart_options->cas &&
 905                     !is_empty_cas(transport->smart_options->cas))
 906                         apply_push_cas(transport->smart_options->cas,
 907                                        transport->remote, remote_refs);
 908
 909                 set_ref_status_for_push(remote_refs,
 910                         flags & TRANSPORT_PUSH_MIRROR,
 911                         flags & TRANSPORT_PUSH_FORCE);
 912
 913                 if (!(flags & TRANSPORT_PUSH_NO_HOOK))
 914                         if (run_pre_push_hook(transport, remote_refs))
 915                                 return -1;
 916
 917                 if ((flags & TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND) && !is_bare_repository()) {
 918                         struct ref *ref = remote_refs;
 919                         for (; ref; ref = ref->next)
 920                                 if (!is_null_oid(&ref->new_oid) &&
 921                                     !push_unpushed_submodules(ref->new_oid.hash,
 922                                             transport->remote->name))
 923                                     die ("Failed to push all needed submodules!");
 924                 }
 925
 926                 if ((flags & (TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND |
 927                               TRANSPORT_RECURSE_SUBMODULES_CHECK)) && !is_bare_repository()) {
 928                         struct ref *ref = remote_refs;
 929                         struct string_list needs_pushing = STRING_LIST_INIT_DUP;
 930
 931                         for (; ref; ref = ref->next)
 932                                 if (!is_null_oid(&ref->new_oid) &&
 933                                     find_unpushed_submodules(ref->new_oid.hash,
 934                                             transport->remote->name, &needs_pushing))
 935                                         die_with_unpushed_submodules(&needs_pushing);
 936                 }
 937
 938                 push_ret = transport->push_refs(transport, remote_refs, flags);
 939                 err = push_had_errors(remote_refs);
 940                 ret = push_ret | err;
 941
 942                 if (!quiet || err)
 943                         transport_print_push_status(transport->url, remote_refs,
 944                                         verbose | porcelain, porcelain,
 945                                         reject_reasons);
 946
 947                 if (flags & TRANSPORT_PUSH_SET_UPSTREAM)
 948                         set_upstreams(transport, remote_refs, pretend);
 949
 950                 if (!(flags & TRANSPORT_PUSH_DRY_RUN)) {
 951                         struct ref *ref;
 952                         for (ref = remote_refs; ref; ref = ref->next)
 953                                 transport_update_tracking_ref(transport->remote, ref, verbose);
 954                 }
 955
 956                 if (porcelain && !push_ret)
 957                         puts("Done");
 958                 else if (!quiet && !ret && !transport_refs_pushed(remote_refs))
 959                         fprintf(stderr, "Everything up-to-date\n");
 960
 961                 return ret;
 962         }
 963         return 1;
 964 }
 965
 966 const struct ref *transport_get_remote_refs(struct transport *transport)
 967 {
 968         if (!transport->got_remote_refs) {
 969                 transport->remote_refs = transport->get_refs_list(transport, 0);
 970                 transport->got_remote_refs = 1;
 971         }
 972
 973         return transport->remote_refs;
 974 }
 975
 976 int transport_fetch_refs(struct transport *transport, struct ref *refs)
 977 {
 978         int rc;
 979         int nr_heads = 0, nr_alloc = 0, nr_refs = 0;
 980         struct ref **heads = NULL;
 981         struct ref *rm;
 982
 983         for (rm = refs; rm; rm = rm->next) {
 984                 nr_refs++;
 985                 if (rm->peer_ref &&
 986                     !is_null_oid(&rm->old_oid) &&
 987                     !oidcmp(&rm->peer_ref->old_oid, &rm->old_oid))
 988                         continue;
 989                 ALLOC_GROW(heads, nr_heads + 1, nr_alloc);
 990                 heads[nr_heads++] = rm;
 991         }
 992
 993         if (!nr_heads) {
 994                 /*
 995                  * When deepening of a shallow repository is requested,
 996                  * then local and remote refs are likely to still be equal.
 997                  * Just feed them all to the fetch method in that case.
 998                  * This condition shouldn't be met in a non-deepening fetch
 999                  * (see builtin/fetch.c:quickfetch()).
1000                  */
1001                 ALLOC_ARRAY(heads, nr_refs);
1002                 for (rm = refs; rm; rm = rm->next)
1003                         heads[nr_heads++] = rm;
1004         }
1005
1006         rc = transport->fetch(transport, nr_heads, heads);
1007
1008         free(heads);
1009         return rc;
1010 }
1011
1012 void transport_unlock_pack(struct transport *transport)
1013 {
1014         if (transport->pack_lockfile) {
1015                 unlink_or_warn(transport->pack_lockfile);
1016                 free(transport->pack_lockfile);
1017                 transport->pack_lockfile = NULL;
1018         }
1019 }
1020
1021 int transport_connect(struct transport *transport, const char *name,
1022                       const char *exec, int fd[2])
1023 {
1024         if (transport->connect)
1025                 return transport->connect(transport, name, exec, fd);
1026         else
1027                 die("Operation not supported by protocol");
1028 }
1029
1030 int transport_disconnect(struct transport *transport)
1031 {
1032         int ret = 0;
1033         if (transport->disconnect)
1034                 ret = transport->disconnect(transport);
1035         free(transport);
1036         return ret;
1037 }
1038
1039 /*
1040  * Strip username (and password) from a URL and return
1041  * it in a newly allocated string.
1042  */
1043 char *transport_anonymize_url(const char *url)
1044 {
1045         char *scheme_prefix, *anon_part;
1046         size_t anon_len, prefix_len = 0;
1047
1048         anon_part = strchr(url, '@');
1049         if (url_is_local_not_ssh(url) || !anon_part)
1050                 goto literal_copy;
1051
1052         anon_len = strlen(++anon_part);
1053         scheme_prefix = strstr(url, "://");
1054         if (!scheme_prefix) {
1055                 if (!strchr(anon_part, ':'))
1056                         /* cannot be "me@there:/path/name" */
1057                         goto literal_copy;
1058         } else {
1059                 const char *cp;
1060                 /* make sure scheme is reasonable */
1061                 for (cp = url; cp < scheme_prefix; cp++) {
1062                         switch (*cp) {
1063                                 /* RFC 1738 2.1 */
1064                         case '+': case '.': case '-':
1065                                 break; /* ok */
1066                         default:
1067                                 if (isalnum(*cp))
1068                                         break;
1069                                 /* it isn't */
1070                                 goto literal_copy;
1071                         }
1072                 }
1073                 /* @ past the first slash does not count */
1074                 cp = strchr(scheme_prefix + 3, '/');
1075                 if (cp && cp < anon_part)
1076                         goto literal_copy;
1077                 prefix_len = scheme_prefix - url + 3;
1078         }
1079         return xstrfmt("%.*s%.*s", (int)prefix_len, url,
1080                        (int)anon_len, anon_part);
1081 literal_copy:
1082         return xstrdup(url);
1083 }
1084
1085 struct alternate_refs_data {
1086         alternate_ref_fn *fn;
1087         void *data;
1088 };
1089
1090 static int refs_from_alternate_cb(struct alternate_object_database *e,
1091                                   void *data)
1092 {
1093         char *other;
1094         size_t len;
1095         struct remote *remote;
1096         struct transport *transport;
1097         const struct ref *extra;
1098         struct alternate_refs_data *cb = data;
1099
1100         e->name[-1] = '\0';
1101         other = xstrdup(real_path(e->base));
1102         e->name[-1] = '/';
1103         len = strlen(other);
1104
1105         while (other[len-1] == '/')
1106                 other[--len] = '\0';
1107         if (len < 8 || memcmp(other + len - 8, "/objects", 8))
1108                 goto out;
1109         /* Is this a git repository with refs? */
1110         memcpy(other + len - 8, "/refs", 6);
1111         if (!is_directory(other))
1112                 goto out;
1113         other[len - 8] = '\0';
1114         remote = remote_get(other);
1115         transport = transport_get(remote, other);
1116         for (extra = transport_get_remote_refs(transport);
1117              extra;
1118              extra = extra->next)
1119                 cb->fn(extra, cb->data);
1120         transport_disconnect(transport);
1121 out:
1122         free(other);
1123         return 0;
1124 }
1125
1126 void for_each_alternate_ref(alternate_ref_fn fn, void *data)
1127 {
1128         struct alternate_refs_data cb;
1129         cb.fn = fn;
1130         cb.data = data;
1131         foreach_alt_odb(refs_from_alternate_cb, &cb);
1132 }