transport.c

   1 #include "cache.h"
   2 #include "transport.h"
   3 #include "run-command.h"
   4 #include "pkt-line.h"
   5 #include "fetch-pack.h"
   6 #include "remote.h"
   7 #include "connect.h"
   8 #include "send-pack.h"
   9 #include "walker.h"
  10 #include "bundle.h"
  11 #include "dir.h"
  12 #include "refs.h"
  13 #include "branch.h"
  14 #include "url.h"
  15 #include "submodule.h"
  16 #include "string-list.h"
  17 #include "sha1-array.h"
  18 #include "sigchain.h"
  19
  20 static void set_upstreams(struct transport *transport, struct ref *refs,
  21         int pretend)
  22 {
  23         struct ref *ref;
  24         for (ref = refs; ref; ref = ref->next) {
  25                 const char *localname;
  26                 const char *tmp;
  27                 const char *remotename;
  28                 unsigned char sha[20];
  29                 int flag = 0;
  30                 /*
  31                  * Check suitability for tracking. Must be successful /
  32                  * already up-to-date ref create/modify (not delete).
  33                  */
  34                 if (ref->status != REF_STATUS_OK &&
  35                         ref->status != REF_STATUS_UPTODATE)
  36                         continue;
  37                 if (!ref->peer_ref)
  38                         continue;
  39                 if (is_null_oid(&ref->new_oid))
  40                         continue;
  41
  42                 /* Follow symbolic refs (mainly for HEAD). */
  43                 localname = ref->peer_ref->name;
  44                 remotename = ref->name;
  45                 tmp = resolve_ref_unsafe(localname, RESOLVE_REF_READING,
  46                                          sha, &flag);
  47                 if (tmp && flag & REF_ISSYMREF &&
  48                         starts_with(tmp, "refs/heads/"))
  49                         localname = tmp;
  50
  51                 /* Both source and destination must be local branches. */
  52                 if (!localname || !starts_with(localname, "refs/heads/"))
  53                         continue;
  54                 if (!remotename || !starts_with(remotename, "refs/heads/"))
  55                         continue;
  56
  57                 if (!pretend)
  58                         install_branch_config(BRANCH_CONFIG_VERBOSE,
  59                                 localname + 11, transport->remote->name,
  60                                 remotename);
  61                 else
  62                         printf("Would set upstream of '%s' to '%s' of '%s'\n",
  63                                 localname + 11, remotename + 11,
  64                                 transport->remote->name);
  65         }
  66 }
  67
  68 struct bundle_transport_data {
  69         int fd;
  70         struct bundle_header header;
  71 };
  72
  73 static struct ref *get_refs_from_bundle(struct transport *transport, int for_push)
  74 {
  75         struct bundle_transport_data *data = transport->data;
  76         struct ref *result = NULL;
  77         int i;
  78
  79         if (for_push)
  80                 return NULL;
  81
  82         if (data->fd > 0)
  83                 close(data->fd);
  84         data->fd = read_bundle_header(transport->url, &data->header);
  85         if (data->fd < 0)
  86                 die ("Could not read bundle '%s'.", transport->url);
  87         for (i = 0; i < data->header.references.nr; i++) {
  88                 struct ref_list_entry *e = data->header.references.list + i;
  89                 struct ref *ref = alloc_ref(e->name);
  90                 hashcpy(ref->old_oid.hash, e->sha1);
  91                 ref->next = result;
  92                 result = ref;
  93         }
  94         return result;
  95 }
  96
  97 static int fetch_refs_from_bundle(struct transport *transport,
  98                                int nr_heads, struct ref **to_fetch)
  99 {
 100         struct bundle_transport_data *data = transport->data;
 101         return unbundle(&data->header, data->fd,
 102                         transport->progress ? BUNDLE_VERBOSE : 0);
 103 }
 104
 105 static int close_bundle(struct transport *transport)
 106 {
 107         struct bundle_transport_data *data = transport->data;
 108         if (data->fd > 0)
 109                 close(data->fd);
 110         free(data);
 111         return 0;
 112 }
 113
 114 struct git_transport_data {
 115         struct git_transport_options options;
 116         struct child_process *conn;
 117         int fd[2];
 118         unsigned got_remote_heads : 1;
 119         struct sha1_array extra_have;
 120         struct sha1_array shallow;
 121 };
 122
 123 static int set_git_option(struct git_transport_options *opts,
 124                           const char *name, const char *value)
 125 {
 126         if (!strcmp(name, TRANS_OPT_UPLOADPACK)) {
 127                 opts->uploadpack = value;
 128                 return 0;
 129         } else if (!strcmp(name, TRANS_OPT_RECEIVEPACK)) {
 130                 opts->receivepack = value;
 131                 return 0;
 132         } else if (!strcmp(name, TRANS_OPT_THIN)) {
 133                 opts->thin = !!value;
 134                 return 0;
 135         } else if (!strcmp(name, TRANS_OPT_FOLLOWTAGS)) {
 136                 opts->followtags = !!value;
 137                 return 0;
 138         } else if (!strcmp(name, TRANS_OPT_KEEP)) {
 139                 opts->keep = !!value;
 140                 return 0;
 141         } else if (!strcmp(name, TRANS_OPT_UPDATE_SHALLOW)) {
 142                 opts->update_shallow = !!value;
 143                 return 0;
 144         } else if (!strcmp(name, TRANS_OPT_DEPTH)) {
 145                 if (!value)
 146                         opts->depth = 0;
 147                 else {
 148                         char *end;
 149                         opts->depth = strtol(value, &end, 0);
 150                         if (*end)
 151                                 die("transport: invalid depth option '%s'", value);
 152                 }
 153                 return 0;
 154         } else if (!strcmp(name, TRANS_OPT_DEEPEN_SINCE)) {
 155                 opts->deepen_since = value;
 156                 return 0;
 157         } else if (!strcmp(name, TRANS_OPT_DEEPEN_NOT)) {
 158                 opts->deepen_not = (const struct string_list *)value;
 159                 return 0;
 160         }
 161         return 1;
 162 }
 163
 164 static int connect_setup(struct transport *transport, int for_push)
 165 {
 166         struct git_transport_data *data = transport->data;
 167         int flags = transport->verbose > 0 ? CONNECT_VERBOSE : 0;
 168
 169         if (data->conn)
 170                 return 0;
 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.deepen_since = data->options.deepen_since;
 215         args.deepen_not = data->options.deepen_not;
 216         args.check_self_contained_and_connected =
 217                 data->options.check_self_contained_and_connected;
 218         args.cloning = transport->cloning;
 219         args.update_shallow = data->options.update_shallow;
 220
 221         if (!data->got_remote_heads) {
 222                 connect_setup(transport, 0);
 223                 get_remote_heads(data->fd[0], NULL, 0, &refs_tmp, 0,
 224                                  NULL, &data->shallow);
 225                 data->got_remote_heads = 1;
 226         }
 227
 228         refs = fetch_pack(&args, data->fd, data->conn,
 229                           refs_tmp ? refs_tmp : transport->remote_refs,
 230                           dest, to_fetch, nr_heads, &data->shallow,
 231                           &transport->pack_lockfile);
 232         close(data->fd[0]);
 233         close(data->fd[1]);
 234         if (finish_connect(data->conn)) {
 235                 free_refs(refs);
 236                 refs = NULL;
 237         }
 238         data->conn = NULL;
 239         data->got_remote_heads = 0;
 240         data->options.self_contained_and_connected =
 241                 args.self_contained_and_connected;
 242
 243         free_refs(refs_tmp);
 244         free_refs(refs);
 245         free(dest);
 246         return (refs ? 0 : -1);
 247 }
 248
 249 static int push_had_errors(struct ref *ref)
 250 {
 251         for (; ref; ref = ref->next) {
 252                 switch (ref->status) {
 253                 case REF_STATUS_NONE:
 254                 case REF_STATUS_UPTODATE:
 255                 case REF_STATUS_OK:
 256                         break;
 257                 default:
 258                         return 1;
 259                 }
 260         }
 261         return 0;
 262 }
 263
 264 int transport_refs_pushed(struct ref *ref)
 265 {
 266         for (; ref; ref = ref->next) {
 267                 switch(ref->status) {
 268                 case REF_STATUS_NONE:
 269                 case REF_STATUS_UPTODATE:
 270                         break;
 271                 default:
 272                         return 1;
 273                 }
 274         }
 275         return 0;
 276 }
 277
 278 void transport_update_tracking_ref(struct remote *remote, struct ref *ref, int verbose)
 279 {
 280         struct refspec rs;
 281
 282         if (ref->status != REF_STATUS_OK && ref->status != REF_STATUS_UPTODATE)
 283                 return;
 284
 285         rs.src = ref->name;
 286         rs.dst = NULL;
 287
 288         if (!remote_find_tracking(remote, &rs)) {
 289                 if (verbose)
 290                         fprintf(stderr, "updating local tracking ref '%s'\n", rs.dst);
 291                 if (ref->deletion) {
 292                         delete_ref(rs.dst, NULL, 0);
 293                 } else
 294                         update_ref("update by push", rs.dst,
 295                                         ref->new_oid.hash, NULL, 0, 0);
 296                 free(rs.dst);
 297         }
 298 }
 299
 300 static void print_ref_status(char flag, const char *summary, struct ref *to, struct ref *from, const char *msg, int porcelain)
 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, TRANSPORT_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 const char *status_abbrev(unsigned char sha1[20])
 327 {
 328         return find_unique_abbrev(sha1, DEFAULT_ABBREV);
 329 }
 330
 331 static void print_ok_ref_status(struct ref *ref, int porcelain)
 332 {
 333         if (ref->deletion)
 334                 print_ref_status('-', "[deleted]", ref, NULL, NULL, porcelain);
 335         else if (is_null_oid(&ref->old_oid))
 336                 print_ref_status('*',
 337                         (starts_with(ref->name, "refs/tags/") ? "[new tag]" :
 338                         "[new branch]"),
 339                         ref, ref->peer_ref, NULL, porcelain);
 340         else {
 341                 struct strbuf quickref = STRBUF_INIT;
 342                 char type;
 343                 const char *msg;
 344
 345                 strbuf_addstr(&quickref, status_abbrev(ref->old_oid.hash));
 346                 if (ref->forced_update) {
 347                         strbuf_addstr(&quickref, "...");
 348                         type = '+';
 349                         msg = "forced update";
 350                 } else {
 351                         strbuf_addstr(&quickref, "..");
 352                         type = ' ';
 353                         msg = NULL;
 354                 }
 355                 strbuf_addstr(&quickref, status_abbrev(ref->new_oid.hash));
 356
 357                 print_ref_status(type, quickref.buf, ref, ref->peer_ref, msg, porcelain);
 358                 strbuf_release(&quickref);
 359         }
 360 }
 361
 362 static int print_one_push_status(struct ref *ref, const char *dest, int count, int porcelain)
 363 {
 364         if (!count)
 365                 fprintf(porcelain ? stdout : stderr, "To %s\n", dest);
 366
 367         switch(ref->status) {
 368         case REF_STATUS_NONE:
 369                 print_ref_status('X', "[no match]", ref, NULL, NULL, porcelain);
 370                 break;
 371         case REF_STATUS_REJECT_NODELETE:
 372                 print_ref_status('!', "[rejected]", ref, NULL,
 373                                                  "remote does not support deleting refs", porcelain);
 374                 break;
 375         case REF_STATUS_UPTODATE:
 376                 print_ref_status('=', "[up to date]", ref,
 377                                                  ref->peer_ref, NULL, porcelain);
 378                 break;
 379         case REF_STATUS_REJECT_NONFASTFORWARD:
 380                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 381                                                  "non-fast-forward", porcelain);
 382                 break;
 383         case REF_STATUS_REJECT_ALREADY_EXISTS:
 384                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 385                                                  "already exists", porcelain);
 386                 break;
 387         case REF_STATUS_REJECT_FETCH_FIRST:
 388                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 389                                                  "fetch first", porcelain);
 390                 break;
 391         case REF_STATUS_REJECT_NEEDS_FORCE:
 392                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 393                                                  "needs force", porcelain);
 394                 break;
 395         case REF_STATUS_REJECT_STALE:
 396                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 397                                                  "stale info", porcelain);
 398                 break;
 399         case REF_STATUS_REJECT_SHALLOW:
 400                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 401                                                  "new shallow roots not allowed", porcelain);
 402                 break;
 403         case REF_STATUS_REMOTE_REJECT:
 404                 print_ref_status('!', "[remote rejected]", ref,
 405                                                  ref->deletion ? NULL : ref->peer_ref,
 406                                                  ref->remote_status, porcelain);
 407                 break;
 408         case REF_STATUS_EXPECTING_REPORT:
 409                 print_ref_status('!', "[remote failure]", ref,
 410                                                  ref->deletion ? NULL : ref->peer_ref,
 411                                                  "remote failed to report status", porcelain);
 412                 break;
 413         case REF_STATUS_ATOMIC_PUSH_FAILED:
 414                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 415                                                  "atomic push failed", porcelain);
 416                 break;
 417         case REF_STATUS_OK:
 418                 print_ok_ref_status(ref, porcelain);
 419                 break;
 420         }
 421
 422         return 1;
 423 }
 424
 425 void transport_print_push_status(const char *dest, struct ref *refs,
 426                                   int verbose, int porcelain, unsigned int *reject_reasons)
 427 {
 428         struct ref *ref;
 429         int n = 0;
 430         unsigned char head_sha1[20];
 431         char *head;
 432
 433         head = resolve_refdup("HEAD", RESOLVE_REF_READING, head_sha1, NULL);
 434
 435         if (verbose) {
 436                 for (ref = refs; ref; ref = ref->next)
 437                         if (ref->status == REF_STATUS_UPTODATE)
 438                                 n += print_one_push_status(ref, dest, n, porcelain);
 439         }
 440
 441         for (ref = refs; ref; ref = ref->next)
 442                 if (ref->status == REF_STATUS_OK)
 443                         n += print_one_push_status(ref, dest, n, porcelain);
 444
 445         *reject_reasons = 0;
 446         for (ref = refs; ref; ref = ref->next) {
 447                 if (ref->status != REF_STATUS_NONE &&
 448                     ref->status != REF_STATUS_UPTODATE &&
 449                     ref->status != REF_STATUS_OK)
 450                         n += print_one_push_status(ref, dest, n, porcelain);
 451                 if (ref->status == REF_STATUS_REJECT_NONFASTFORWARD) {
 452                         if (head != NULL && !strcmp(head, ref->name))
 453                                 *reject_reasons |= REJECT_NON_FF_HEAD;
 454                         else
 455                                 *reject_reasons |= REJECT_NON_FF_OTHER;
 456                 } else if (ref->status == REF_STATUS_REJECT_ALREADY_EXISTS) {
 457                         *reject_reasons |= REJECT_ALREADY_EXISTS;
 458                 } else if (ref->status == REF_STATUS_REJECT_FETCH_FIRST) {
 459                         *reject_reasons |= REJECT_FETCH_FIRST;
 460                 } else if (ref->status == REF_STATUS_REJECT_NEEDS_FORCE) {
 461                         *reject_reasons |= REJECT_NEEDS_FORCE;
 462                 }
 463         }
 464         free(head);
 465 }
 466
 467 void transport_verify_remote_names(int nr_heads, const char **heads)
 468 {
 469         int i;
 470
 471         for (i = 0; i < nr_heads; i++) {
 472                 const char *local = heads[i];
 473                 const char *remote = strrchr(heads[i], ':');
 474
 475                 if (*local == '+')
 476                         local++;
 477
 478                 /* A matching refspec is okay.  */
 479                 if (remote == local && remote[1] == '\0')
 480                         continue;
 481
 482                 remote = remote ? (remote + 1) : local;
 483                 if (check_refname_format(remote,
 484                                 REFNAME_ALLOW_ONELEVEL|REFNAME_REFSPEC_PATTERN))
 485                         die("remote part of refspec is not a valid name in %s",
 486                                 heads[i]);
 487         }
 488 }
 489
 490 static int git_transport_push(struct transport *transport, struct ref *remote_refs, int flags)
 491 {
 492         struct git_transport_data *data = transport->data;
 493         struct send_pack_args args;
 494         int ret;
 495
 496         if (!data->got_remote_heads) {
 497                 struct ref *tmp_refs;
 498                 connect_setup(transport, 1);
 499
 500                 get_remote_heads(data->fd[0], NULL, 0, &tmp_refs, REF_NORMAL,
 501                                  NULL, &data->shallow);
 502                 data->got_remote_heads = 1;
 503         }
 504
 505         memset(&args, 0, sizeof(args));
 506         args.send_mirror = !!(flags & TRANSPORT_PUSH_MIRROR);
 507         args.force_update = !!(flags & TRANSPORT_PUSH_FORCE);
 508         args.use_thin_pack = data->options.thin;
 509         args.verbose = (transport->verbose > 0);
 510         args.quiet = (transport->verbose < 0);
 511         args.progress = transport->progress;
 512         args.dry_run = !!(flags & TRANSPORT_PUSH_DRY_RUN);
 513         args.porcelain = !!(flags & TRANSPORT_PUSH_PORCELAIN);
 514         args.atomic = !!(flags & TRANSPORT_PUSH_ATOMIC);
 515         args.url = transport->url;
 516
 517         if (flags & TRANSPORT_PUSH_CERT_ALWAYS)
 518                 args.push_cert = SEND_PACK_PUSH_CERT_ALWAYS;
 519         else if (flags & TRANSPORT_PUSH_CERT_IF_ASKED)
 520                 args.push_cert = SEND_PACK_PUSH_CERT_IF_ASKED;
 521         else
 522                 args.push_cert = SEND_PACK_PUSH_CERT_NEVER;
 523
 524         ret = send_pack(&args, data->fd, data->conn, remote_refs,
 525                         &data->extra_have);
 526
 527         close(data->fd[1]);
 528         close(data->fd[0]);
 529         ret |= finish_connect(data->conn);
 530         data->conn = NULL;
 531         data->got_remote_heads = 0;
 532
 533         return ret;
 534 }
 535
 536 static int connect_git(struct transport *transport, const char *name,
 537                        const char *executable, int fd[2])
 538 {
 539         struct git_transport_data *data = transport->data;
 540         data->conn = git_connect(data->fd, transport->url,
 541                                  executable, 0);
 542         fd[0] = data->fd[0];
 543         fd[1] = data->fd[1];
 544         return 0;
 545 }
 546
 547 static int disconnect_git(struct transport *transport)
 548 {
 549         struct git_transport_data *data = transport->data;
 550         if (data->conn) {
 551                 if (data->got_remote_heads)
 552                         packet_flush(data->fd[1]);
 553                 close(data->fd[0]);
 554                 close(data->fd[1]);
 555                 finish_connect(data->conn);
 556         }
 557
 558         free(data);
 559         return 0;
 560 }
 561
 562 void transport_take_over(struct transport *transport,
 563                          struct child_process *child)
 564 {
 565         struct git_transport_data *data;
 566
 567         if (!transport->smart_options)
 568                 die("Bug detected: Taking over transport requires non-NULL "
 569                     "smart_options field.");
 570
 571         data = xcalloc(1, sizeof(*data));
 572         data->options = *transport->smart_options;
 573         data->conn = child;
 574         data->fd[0] = data->conn->out;
 575         data->fd[1] = data->conn->in;
 576         data->got_remote_heads = 0;
 577         transport->data = data;
 578
 579         transport->set_option = NULL;
 580         transport->get_refs_list = get_refs_via_connect;
 581         transport->fetch = fetch_refs_via_pack;
 582         transport->push = NULL;
 583         transport->push_refs = git_transport_push;
 584         transport->disconnect = disconnect_git;
 585         transport->smart_options = &(data->options);
 586
 587         transport->cannot_reuse = 1;
 588 }
 589
 590 static int is_file(const char *url)
 591 {
 592         struct stat buf;
 593         if (stat(url, &buf))
 594                 return 0;
 595         return S_ISREG(buf.st_mode);
 596 }
 597
 598 static int external_specification_len(const char *url)
 599 {
 600         return strchr(url, ':') - url;
 601 }
 602
 603 static const struct string_list *protocol_whitelist(void)
 604 {
 605         static int enabled = -1;
 606         static struct string_list allowed = STRING_LIST_INIT_DUP;
 607
 608         if (enabled < 0) {
 609                 const char *v = getenv("GIT_ALLOW_PROTOCOL");
 610                 if (v) {
 611                         string_list_split(&allowed, v, ':', -1);
 612                         string_list_sort(&allowed);
 613                         enabled = 1;
 614                 } else {
 615                         enabled = 0;
 616                 }
 617         }
 618
 619         return enabled ? &allowed : NULL;
 620 }
 621
 622 int is_transport_allowed(const char *type)
 623 {
 624         const struct string_list *allowed = protocol_whitelist();
 625         return !allowed || string_list_has_string(allowed, type);
 626 }
 627
 628 void transport_check_allowed(const char *type)
 629 {
 630         if (!is_transport_allowed(type))
 631                 die("transport '%s' not allowed", type);
 632 }
 633
 634 int transport_restrict_protocols(void)
 635 {
 636         return !!protocol_whitelist();
 637 }
 638
 639 struct transport *transport_get(struct remote *remote, const char *url)
 640 {
 641         const char *helper;
 642         struct transport *ret = xcalloc(1, sizeof(*ret));
 643
 644         ret->progress = isatty(2);
 645
 646         if (!remote)
 647                 die("No remote provided to transport_get()");
 648
 649         ret->got_remote_refs = 0;
 650         ret->remote = remote;
 651         helper = remote->foreign_vcs;
 652
 653         if (!url && remote->url)
 654                 url = remote->url[0];
 655         ret->url = url;
 656
 657         /* maybe it is a foreign URL? */
 658         if (url) {
 659                 const char *p = url;
 660
 661                 while (is_urlschemechar(p == url, *p))
 662                         p++;
 663                 if (starts_with(p, "::"))
 664                         helper = xstrndup(url, p - url);
 665         }
 666
 667         if (helper) {
 668                 transport_helper_init(ret, helper);
 669         } else if (starts_with(url, "rsync:")) {
 670                 die("git-over-rsync is no longer supported");
 671         } else if (url_is_local_not_ssh(url) && is_file(url) && is_bundle(url, 1)) {
 672                 struct bundle_transport_data *data = xcalloc(1, sizeof(*data));
 673                 transport_check_allowed("file");
 674                 ret->data = data;
 675                 ret->get_refs_list = get_refs_from_bundle;
 676                 ret->fetch = fetch_refs_from_bundle;
 677                 ret->disconnect = close_bundle;
 678                 ret->smart_options = NULL;
 679         } else if (!is_url(url)
 680                 || starts_with(url, "file://")
 681                 || starts_with(url, "git://")
 682                 || starts_with(url, "ssh://")
 683                 || starts_with(url, "git+ssh://")
 684                 || starts_with(url, "ssh+git://")) {
 685                 /*
 686                  * These are builtin smart transports; "allowed" transports
 687                  * will be checked individually in git_connect.
 688                  */
 689                 struct git_transport_data *data = xcalloc(1, sizeof(*data));
 690                 ret->data = data;
 691                 ret->set_option = NULL;
 692                 ret->get_refs_list = get_refs_via_connect;
 693                 ret->fetch = fetch_refs_via_pack;
 694                 ret->push_refs = git_transport_push;
 695                 ret->connect = connect_git;
 696                 ret->disconnect = disconnect_git;
 697                 ret->smart_options = &(data->options);
 698
 699                 data->conn = NULL;
 700                 data->got_remote_heads = 0;
 701         } else {
 702                 /* Unknown protocol in URL. Pass to external handler. */
 703                 int len = external_specification_len(url);
 704                 char *handler = xmemdupz(url, len);
 705                 transport_helper_init(ret, handler);
 706         }
 707
 708         if (ret->smart_options) {
 709                 ret->smart_options->thin = 1;
 710                 ret->smart_options->uploadpack = "git-upload-pack";
 711                 if (remote->uploadpack)
 712                         ret->smart_options->uploadpack = remote->uploadpack;
 713                 ret->smart_options->receivepack = "git-receive-pack";
 714                 if (remote->receivepack)
 715                         ret->smart_options->receivepack = remote->receivepack;
 716         }
 717
 718         return ret;
 719 }
 720
 721 int transport_set_option(struct transport *transport,
 722                          const char *name, const char *value)
 723 {
 724         int git_reports = 1, protocol_reports = 1;
 725
 726         if (transport->smart_options)
 727                 git_reports = set_git_option(transport->smart_options,
 728                                              name, value);
 729
 730         if (transport->set_option)
 731                 protocol_reports = transport->set_option(transport, name,
 732                                                         value);
 733
 734         /* If either report is 0, report 0 (success). */
 735         if (!git_reports || !protocol_reports)
 736                 return 0;
 737         /* If either reports -1 (invalid value), report -1. */
 738         if ((git_reports == -1) || (protocol_reports == -1))
 739                 return -1;
 740         /* Otherwise if both report unknown, report unknown. */
 741         return 1;
 742 }
 743
 744 void transport_set_verbosity(struct transport *transport, int verbosity,
 745         int force_progress)
 746 {
 747         if (verbosity >= 1)
 748                 transport->verbose = verbosity <= 3 ? verbosity : 3;
 749         if (verbosity < 0)
 750                 transport->verbose = -1;
 751
 752         /**
 753          * Rules used to determine whether to report progress (processing aborts
 754          * when a rule is satisfied):
 755          *
 756          *   . Report progress, if force_progress is 1 (ie. --progress).
 757          *   . Don't report progress, if force_progress is 0 (ie. --no-progress).
 758          *   . Don't report progress, if verbosity < 0 (ie. -q/--quiet ).
 759          *   . Report progress if isatty(2) is 1.
 760          **/
 761         if (force_progress >= 0)
 762                 transport->progress = !!force_progress;
 763         else
 764                 transport->progress = verbosity >= 0 && isatty(2);
 765 }
 766
 767 static void die_with_unpushed_submodules(struct string_list *needs_pushing)
 768 {
 769         int i;
 770
 771         fprintf(stderr, "The following submodule paths contain changes that can\n"
 772                         "not be found on any remote:\n");
 773         for (i = 0; i < needs_pushing->nr; i++)
 774                 printf("  %s\n", needs_pushing->items[i].string);
 775         fprintf(stderr, "\nPlease try\n\n"
 776                         "       git push --recurse-submodules=on-demand\n\n"
 777                         "or cd to the path and use\n\n"
 778                         "       git push\n\n"
 779                         "to push them to a remote.\n\n");
 780
 781         string_list_clear(needs_pushing, 0);
 782
 783         die("Aborting.");
 784 }
 785
 786 static int run_pre_push_hook(struct transport *transport,
 787                              struct ref *remote_refs)
 788 {
 789         int ret = 0, x;
 790         struct ref *r;
 791         struct child_process proc = CHILD_PROCESS_INIT;
 792         struct strbuf buf;
 793         const char *argv[4];
 794
 795         if (!(argv[0] = find_hook("pre-push")))
 796                 return 0;
 797
 798         argv[1] = transport->remote->name;
 799         argv[2] = transport->url;
 800         argv[3] = NULL;
 801
 802         proc.argv = argv;
 803         proc.in = -1;
 804
 805         if (start_command(&proc)) {
 806                 finish_command(&proc);
 807                 return -1;
 808         }
 809
 810         sigchain_push(SIGPIPE, SIG_IGN);
 811
 812         strbuf_init(&buf, 256);
 813
 814         for (r = remote_refs; r; r = r->next) {
 815                 if (!r->peer_ref) continue;
 816                 if (r->status == REF_STATUS_REJECT_NONFASTFORWARD) continue;
 817                 if (r->status == REF_STATUS_REJECT_STALE) continue;
 818                 if (r->status == REF_STATUS_UPTODATE) continue;
 819
 820                 strbuf_reset(&buf);
 821                 strbuf_addf( &buf, "%s %s %s %s\n",
 822                          r->peer_ref->name, oid_to_hex(&r->new_oid),
 823                          r->name, oid_to_hex(&r->old_oid));
 824
 825                 if (write_in_full(proc.in, buf.buf, buf.len) < 0) {
 826                         /* We do not mind if a hook does not read all refs. */
 827                         if (errno != EPIPE)
 828                                 ret = -1;
 829                         break;
 830                 }
 831         }
 832
 833         strbuf_release(&buf);
 834
 835         x = close(proc.in);
 836         if (!ret)
 837                 ret = x;
 838
 839         sigchain_pop(SIGPIPE);
 840
 841         x = finish_command(&proc);
 842         if (!ret)
 843                 ret = x;
 844
 845         return ret;
 846 }
 847
 848 int transport_push(struct transport *transport,
 849                    int refspec_nr, const char **refspec, int flags,
 850                    unsigned int *reject_reasons)
 851 {
 852         *reject_reasons = 0;
 853         transport_verify_remote_names(refspec_nr, refspec);
 854
 855         if (transport->push) {
 856                 /* Maybe FIXME. But no important transport uses this case. */
 857                 if (flags & TRANSPORT_PUSH_SET_UPSTREAM)
 858                         die("This transport does not support using --set-upstream");
 859
 860                 return transport->push(transport, refspec_nr, refspec, flags);
 861         } else if (transport->push_refs) {
 862                 struct ref *remote_refs;
 863                 struct ref *local_refs = get_local_heads();
 864                 int match_flags = MATCH_REFS_NONE;
 865                 int verbose = (transport->verbose > 0);
 866                 int quiet = (transport->verbose < 0);
 867                 int porcelain = flags & TRANSPORT_PUSH_PORCELAIN;
 868                 int pretend = flags & TRANSPORT_PUSH_DRY_RUN;
 869                 int push_ret, ret, err;
 870
 871                 if (check_push_refs(local_refs, refspec_nr, refspec) < 0)
 872                         return -1;
 873
 874                 remote_refs = transport->get_refs_list(transport, 1);
 875
 876                 if (flags & TRANSPORT_PUSH_ALL)
 877                         match_flags |= MATCH_REFS_ALL;
 878                 if (flags & TRANSPORT_PUSH_MIRROR)
 879                         match_flags |= MATCH_REFS_MIRROR;
 880                 if (flags & TRANSPORT_PUSH_PRUNE)
 881                         match_flags |= MATCH_REFS_PRUNE;
 882                 if (flags & TRANSPORT_PUSH_FOLLOW_TAGS)
 883                         match_flags |= MATCH_REFS_FOLLOW_TAGS;
 884
 885                 if (match_push_refs(local_refs, &remote_refs,
 886                                     refspec_nr, refspec, match_flags)) {
 887                         return -1;
 888                 }
 889
 890                 if (transport->smart_options &&
 891                     transport->smart_options->cas &&
 892                     !is_empty_cas(transport->smart_options->cas))
 893                         apply_push_cas(transport->smart_options->cas,
 894                                        transport->remote, remote_refs);
 895
 896                 set_ref_status_for_push(remote_refs,
 897                         flags & TRANSPORT_PUSH_MIRROR,
 898                         flags & TRANSPORT_PUSH_FORCE);
 899
 900                 if (!(flags & TRANSPORT_PUSH_NO_HOOK))
 901                         if (run_pre_push_hook(transport, remote_refs))
 902                                 return -1;
 903
 904                 if ((flags & TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND) && !is_bare_repository()) {
 905                         struct ref *ref = remote_refs;
 906                         for (; ref; ref = ref->next)
 907                                 if (!is_null_oid(&ref->new_oid) &&
 908                                     !push_unpushed_submodules(ref->new_oid.hash,
 909                                             transport->remote->name))
 910                                     die ("Failed to push all needed submodules!");
 911                 }
 912
 913                 if ((flags & (TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND |
 914                               TRANSPORT_RECURSE_SUBMODULES_CHECK)) && !is_bare_repository()) {
 915                         struct ref *ref = remote_refs;
 916                         struct string_list needs_pushing = STRING_LIST_INIT_DUP;
 917
 918                         for (; ref; ref = ref->next)
 919                                 if (!is_null_oid(&ref->new_oid) &&
 920                                     find_unpushed_submodules(ref->new_oid.hash,
 921                                             transport->remote->name, &needs_pushing))
 922                                         die_with_unpushed_submodules(&needs_pushing);
 923                 }
 924
 925                 push_ret = transport->push_refs(transport, remote_refs, flags);
 926                 err = push_had_errors(remote_refs);
 927                 ret = push_ret | err;
 928
 929                 if (!quiet || err)
 930                         transport_print_push_status(transport->url, remote_refs,
 931                                         verbose | porcelain, porcelain,
 932                                         reject_reasons);
 933
 934                 if (flags & TRANSPORT_PUSH_SET_UPSTREAM)
 935                         set_upstreams(transport, remote_refs, pretend);
 936
 937                 if (!(flags & TRANSPORT_PUSH_DRY_RUN)) {
 938                         struct ref *ref;
 939                         for (ref = remote_refs; ref; ref = ref->next)
 940                                 transport_update_tracking_ref(transport->remote, ref, verbose);
 941                 }
 942
 943                 if (porcelain && !push_ret)
 944                         puts("Done");
 945                 else if (!quiet && !ret && !transport_refs_pushed(remote_refs))
 946                         fprintf(stderr, "Everything up-to-date\n");
 947
 948                 return ret;
 949         }
 950         return 1;
 951 }
 952
 953 const struct ref *transport_get_remote_refs(struct transport *transport)
 954 {
 955         if (!transport->got_remote_refs) {
 956                 transport->remote_refs = transport->get_refs_list(transport, 0);
 957                 transport->got_remote_refs = 1;
 958         }
 959
 960         return transport->remote_refs;
 961 }
 962
 963 int transport_fetch_refs(struct transport *transport, struct ref *refs)
 964 {
 965         int rc;
 966         int nr_heads = 0, nr_alloc = 0, nr_refs = 0;
 967         struct ref **heads = NULL;
 968         struct ref *rm;
 969
 970         for (rm = refs; rm; rm = rm->next) {
 971                 nr_refs++;
 972                 if (rm->peer_ref &&
 973                     !is_null_oid(&rm->old_oid) &&
 974                     !oidcmp(&rm->peer_ref->old_oid, &rm->old_oid))
 975                         continue;
 976                 ALLOC_GROW(heads, nr_heads + 1, nr_alloc);
 977                 heads[nr_heads++] = rm;
 978         }
 979
 980         if (!nr_heads) {
 981                 /*
 982                  * When deepening of a shallow repository is requested,
 983                  * then local and remote refs are likely to still be equal.
 984                  * Just feed them all to the fetch method in that case.
 985                  * This condition shouldn't be met in a non-deepening fetch
 986                  * (see builtin/fetch.c:quickfetch()).
 987                  */
 988                 heads = xmalloc(nr_refs * sizeof(*heads));
 989                 for (rm = refs; rm; rm = rm->next)
 990                         heads[nr_heads++] = rm;
 991         }
 992
 993         rc = transport->fetch(transport, nr_heads, heads);
 994
 995         free(heads);
 996         return rc;
 997 }
 998
 999 void transport_unlock_pack(struct transport *transport)
1000 {
1001         if (transport->pack_lockfile) {
1002                 unlink_or_warn(transport->pack_lockfile);
1003                 free(transport->pack_lockfile);
1004                 transport->pack_lockfile = NULL;
1005         }
1006 }
1007
1008 int transport_connect(struct transport *transport, const char *name,
1009                       const char *exec, int fd[2])
1010 {
1011         if (transport->connect)
1012                 return transport->connect(transport, name, exec, fd);
1013         else
1014                 die("Operation not supported by protocol");
1015 }
1016
1017 int transport_disconnect(struct transport *transport)
1018 {
1019         int ret = 0;
1020         if (transport->disconnect)
1021                 ret = transport->disconnect(transport);
1022         free(transport);
1023         return ret;
1024 }
1025
1026 /*
1027  * Strip username (and password) from a URL and return
1028  * it in a newly allocated string.
1029  */
1030 char *transport_anonymize_url(const char *url)
1031 {
1032         char *anon_url, *scheme_prefix, *anon_part;
1033         size_t anon_len, prefix_len = 0;
1034
1035         anon_part = strchr(url, '@');
1036         if (url_is_local_not_ssh(url) || !anon_part)
1037                 goto literal_copy;
1038
1039         anon_len = strlen(++anon_part);
1040         scheme_prefix = strstr(url, "://");
1041         if (!scheme_prefix) {
1042                 if (!strchr(anon_part, ':'))
1043                         /* cannot be "me@there:/path/name" */
1044                         goto literal_copy;
1045         } else {
1046                 const char *cp;
1047                 /* make sure scheme is reasonable */
1048                 for (cp = url; cp < scheme_prefix; cp++) {
1049                         switch (*cp) {
1050                                 /* RFC 1738 2.1 */
1051                         case '+': case '.': case '-':
1052                                 break; /* ok */
1053                         default:
1054                                 if (isalnum(*cp))
1055                                         break;
1056                                 /* it isn't */
1057                                 goto literal_copy;
1058                         }
1059                 }
1060                 /* @ past the first slash does not count */
1061                 cp = strchr(scheme_prefix + 3, '/');
1062                 if (cp && cp < anon_part)
1063                         goto literal_copy;
1064                 prefix_len = scheme_prefix - url + 3;
1065         }
1066         anon_url = xcalloc(1, 1 + prefix_len + anon_len);
1067         memcpy(anon_url, url, prefix_len);
1068         memcpy(anon_url + prefix_len, anon_part, anon_len);
1069         return anon_url;
1070 literal_copy:
1071         return xstrdup(url);
1072 }
1073
1074 struct alternate_refs_data {
1075         alternate_ref_fn *fn;
1076         void *data;
1077 };
1078
1079 static int refs_from_alternate_cb(struct alternate_object_database *e,
1080                                   void *data)
1081 {
1082         char *other;
1083         size_t len;
1084         struct remote *remote;
1085         struct transport *transport;
1086         const struct ref *extra;
1087         struct alternate_refs_data *cb = data;
1088
1089         e->name[-1] = '\0';
1090         other = xstrdup(real_path(e->base));
1091         e->name[-1] = '/';
1092         len = strlen(other);
1093
1094         while (other[len-1] == '/')
1095                 other[--len] = '\0';
1096         if (len < 8 || memcmp(other + len - 8, "/objects", 8))
1097                 goto out;
1098         /* Is this a git repository with refs? */
1099         memcpy(other + len - 8, "/refs", 6);
1100         if (!is_directory(other))
1101                 goto out;
1102         other[len - 8] = '\0';
1103         remote = remote_get(other);
1104         transport = transport_get(remote, other);
1105         for (extra = transport_get_remote_refs(transport);
1106              extra;
1107              extra = extra->next)
1108                 cb->fn(extra, cb->data);
1109         transport_disconnect(transport);
1110 out:
1111         free(other);
1112         return 0;
1113 }
1114
1115 void for_each_alternate_ref(alternate_ref_fn fn, void *data)
1116 {
1117         struct alternate_refs_data cb;
1118         cb.fn = fn;
1119         cb.data = data;
1120         foreach_alt_odb(refs_from_alternate_cb, &cb);
1121 }