git.oblomov.eu Git - git/blob - transport.c

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