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_tracking(struct transport *transport, struct ref *refs,
  21         int pretend, int publish)
  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                         if (publish)
  59                                 install_branch_publish(localname + 11,
  60                                                 transport->remote->name,
  61                                                 remotename);
  62                         else
  63                                 install_branch_config(BRANCH_CONFIG_VERBOSE,
  64                                                 localname + 11, transport->remote->name,
  65                                                 remotename);
  66                 } else
  67                         printf("Would set %s of '%s' to '%s' of '%s'\n",
  68                                 publish ? "publish" : "upstream",
  69                                 localname + 11, remotename + 11,
  70                                 transport->remote->name);
  71         }
  72 }
  73
  74 struct bundle_transport_data {
  75         int fd;
  76         struct bundle_header header;
  77 };
  78
  79 static struct ref *get_refs_from_bundle(struct transport *transport, int for_push)
  80 {
  81         struct bundle_transport_data *data = transport->data;
  82         struct ref *result = NULL;
  83         int i;
  84
  85         if (for_push)
  86                 return NULL;
  87
  88         if (data->fd > 0)
  89                 close(data->fd);
  90         data->fd = read_bundle_header(transport->url, &data->header);
  91         if (data->fd < 0)
  92                 die ("Could not read bundle '%s'.", transport->url);
  93         for (i = 0; i < data->header.references.nr; i++) {
  94                 struct ref_list_entry *e = data->header.references.list + i;
  95                 struct ref *ref = alloc_ref(e->name);
  96                 hashcpy(ref->old_oid.hash, e->sha1);
  97                 ref->next = result;
  98                 result = ref;
  99         }
 100         return result;
 101 }
 102
 103 static int fetch_refs_from_bundle(struct transport *transport,
 104                                int nr_heads, struct ref **to_fetch)
 105 {
 106         struct bundle_transport_data *data = transport->data;
 107         return unbundle(&data->header, data->fd,
 108                         transport->progress ? BUNDLE_VERBOSE : 0);
 109 }
 110
 111 static int close_bundle(struct transport *transport)
 112 {
 113         struct bundle_transport_data *data = transport->data;
 114         if (data->fd > 0)
 115                 close(data->fd);
 116         free(data);
 117         return 0;
 118 }
 119
 120 struct git_transport_data {
 121         struct git_transport_options options;
 122         struct child_process *conn;
 123         int fd[2];
 124         unsigned got_remote_heads : 1;
 125         struct sha1_array extra_have;
 126         struct sha1_array shallow;
 127 };
 128
 129 static int set_git_option(struct git_transport_options *opts,
 130                           const char *name, const char *value)
 131 {
 132         if (!strcmp(name, TRANS_OPT_UPLOADPACK)) {
 133                 opts->uploadpack = value;
 134                 return 0;
 135         } else if (!strcmp(name, TRANS_OPT_RECEIVEPACK)) {
 136                 opts->receivepack = value;
 137                 return 0;
 138         } else if (!strcmp(name, TRANS_OPT_THIN)) {
 139                 opts->thin = !!value;
 140                 return 0;
 141         } else if (!strcmp(name, TRANS_OPT_FOLLOWTAGS)) {
 142                 opts->followtags = !!value;
 143                 return 0;
 144         } else if (!strcmp(name, TRANS_OPT_KEEP)) {
 145                 opts->keep = !!value;
 146                 return 0;
 147         } else if (!strcmp(name, TRANS_OPT_UPDATE_SHALLOW)) {
 148                 opts->update_shallow = !!value;
 149                 return 0;
 150         } else if (!strcmp(name, TRANS_OPT_DEPTH)) {
 151                 if (!value)
 152                         opts->depth = 0;
 153                 else {
 154                         char *end;
 155                         opts->depth = strtol(value, &end, 0);
 156                         if (*end)
 157                                 die("transport: invalid depth option '%s'", value);
 158                 }
 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         switch (transport->family) {
 173         case TRANSPORT_FAMILY_ALL: break;
 174         case TRANSPORT_FAMILY_IPV4: flags |= CONNECT_IPV4; break;
 175         case TRANSPORT_FAMILY_IPV6: flags |= CONNECT_IPV6; break;
 176         }
 177
 178         data->conn = git_connect(data->fd, transport->url,
 179                                  for_push ? data->options.receivepack :
 180                                  data->options.uploadpack,
 181                                  flags);
 182
 183         return 0;
 184 }
 185
 186 static struct ref *get_refs_via_connect(struct transport *transport, int for_push)
 187 {
 188         struct git_transport_data *data = transport->data;
 189         struct ref *refs;
 190
 191         connect_setup(transport, for_push);
 192         get_remote_heads(data->fd[0], NULL, 0, &refs,
 193                          for_push ? REF_NORMAL : 0,
 194                          &data->extra_have,
 195                          &data->shallow);
 196         data->got_remote_heads = 1;
 197
 198         return refs;
 199 }
 200
 201 static int fetch_refs_via_pack(struct transport *transport,
 202                                int nr_heads, struct ref **to_fetch)
 203 {
 204         struct git_transport_data *data = transport->data;
 205         struct ref *refs;
 206         char *dest = xstrdup(transport->url);
 207         struct fetch_pack_args args;
 208         struct ref *refs_tmp = NULL;
 209
 210         memset(&args, 0, sizeof(args));
 211         args.uploadpack = data->options.uploadpack;
 212         args.keep_pack = data->options.keep;
 213         args.lock_pack = 1;
 214         args.use_thin_pack = data->options.thin;
 215         args.include_tag = data->options.followtags;
 216         args.verbose = (transport->verbose > 1);
 217         args.quiet = (transport->verbose < 0);
 218         args.no_progress = !transport->progress;
 219         args.depth = data->options.depth;
 220         args.check_self_contained_and_connected =
 221                 data->options.check_self_contained_and_connected;
 222         args.cloning = transport->cloning;
 223         args.update_shallow = data->options.update_shallow;
 224
 225         if (!data->got_remote_heads) {
 226                 connect_setup(transport, 0);
 227                 get_remote_heads(data->fd[0], NULL, 0, &refs_tmp, 0,
 228                                  NULL, &data->shallow);
 229                 data->got_remote_heads = 1;
 230         }
 231
 232         refs = fetch_pack(&args, data->fd, data->conn,
 233                           refs_tmp ? refs_tmp : transport->remote_refs,
 234                           dest, to_fetch, nr_heads, &data->shallow,
 235                           &transport->pack_lockfile);
 236         close(data->fd[0]);
 237         close(data->fd[1]);
 238         if (finish_connect(data->conn)) {
 239                 free_refs(refs);
 240                 refs = NULL;
 241         }
 242         data->conn = NULL;
 243         data->got_remote_heads = 0;
 244         data->options.self_contained_and_connected =
 245                 args.self_contained_and_connected;
 246
 247         free_refs(refs_tmp);
 248         free_refs(refs);
 249         free(dest);
 250         return (refs ? 0 : -1);
 251 }
 252
 253 static int push_had_errors(struct ref *ref)
 254 {
 255         for (; ref; ref = ref->next) {
 256                 switch (ref->status) {
 257                 case REF_STATUS_NONE:
 258                 case REF_STATUS_UPTODATE:
 259                 case REF_STATUS_OK:
 260                         break;
 261                 default:
 262                         return 1;
 263                 }
 264         }
 265         return 0;
 266 }
 267
 268 int transport_refs_pushed(struct ref *ref)
 269 {
 270         for (; ref; ref = ref->next) {
 271                 switch(ref->status) {
 272                 case REF_STATUS_NONE:
 273                 case REF_STATUS_UPTODATE:
 274                         break;
 275                 default:
 276                         return 1;
 277                 }
 278         }
 279         return 0;
 280 }
 281
 282 void transport_update_tracking_ref(struct remote *remote, struct ref *ref, int verbose)
 283 {
 284         struct refspec rs;
 285
 286         if (ref->status != REF_STATUS_OK && ref->status != REF_STATUS_UPTODATE)
 287                 return;
 288
 289         rs.src = ref->name;
 290         rs.dst = NULL;
 291
 292         if (!remote_find_tracking(remote, &rs)) {
 293                 if (verbose)
 294                         fprintf(stderr, "updating local tracking ref '%s'\n", rs.dst);
 295                 if (ref->deletion) {
 296                         delete_ref(rs.dst, NULL, 0);
 297                 } else
 298                         update_ref("update by push", rs.dst,
 299                                         ref->new_oid.hash, NULL, 0, 0);
 300                 free(rs.dst);
 301         }
 302 }
 303
 304 static void print_ref_status(char flag, const char *summary, struct ref *to, struct ref *from, const char *msg, int porcelain)
 305 {
 306         if (porcelain) {
 307                 if (from)
 308                         fprintf(stdout, "%c\t%s:%s\t", flag, from->name, to->name);
 309                 else
 310                         fprintf(stdout, "%c\t:%s\t", flag, to->name);
 311                 if (msg)
 312                         fprintf(stdout, "%s (%s)\n", summary, msg);
 313                 else
 314                         fprintf(stdout, "%s\n", summary);
 315         } else {
 316                 fprintf(stderr, " %c %-*s ", flag, TRANSPORT_SUMMARY_WIDTH, summary);
 317                 if (from)
 318                         fprintf(stderr, "%s -> %s", prettify_refname(from->name), prettify_refname(to->name));
 319                 else
 320                         fputs(prettify_refname(to->name), stderr);
 321                 if (msg) {
 322                         fputs(" (", stderr);
 323                         fputs(msg, stderr);
 324                         fputc(')', stderr);
 325                 }
 326                 fputc('\n', stderr);
 327         }
 328 }
 329
 330 static const char *status_abbrev(unsigned char sha1[20])
 331 {
 332         return find_unique_abbrev(sha1, DEFAULT_ABBREV);
 333 }
 334
 335 static void print_ok_ref_status(struct ref *ref, int porcelain)
 336 {
 337         if (ref->deletion)
 338                 print_ref_status('-', "[deleted]", ref, NULL, NULL, porcelain);
 339         else if (is_null_oid(&ref->old_oid))
 340                 print_ref_status('*',
 341                         (starts_with(ref->name, "refs/tags/") ? "[new tag]" :
 342                         "[new branch]"),
 343                         ref, ref->peer_ref, NULL, porcelain);
 344         else {
 345                 struct strbuf quickref = STRBUF_INIT;
 346                 char type;
 347                 const char *msg;
 348
 349                 strbuf_addstr(&quickref, status_abbrev(ref->old_oid.hash));
 350                 if (ref->forced_update) {
 351                         strbuf_addstr(&quickref, "...");
 352                         type = '+';
 353                         msg = "forced update";
 354                 } else {
 355                         strbuf_addstr(&quickref, "..");
 356                         type = ' ';
 357                         msg = NULL;
 358                 }
 359                 strbuf_addstr(&quickref, status_abbrev(ref->new_oid.hash));
 360
 361                 print_ref_status(type, quickref.buf, ref, ref->peer_ref, msg, porcelain);
 362                 strbuf_release(&quickref);
 363         }
 364 }
 365
 366 static int print_one_push_status(struct ref *ref, const char *dest, int count, int porcelain)
 367 {
 368         if (!count)
 369                 fprintf(porcelain ? stdout : stderr, "To %s\n", dest);
 370
 371         switch(ref->status) {
 372         case REF_STATUS_NONE:
 373                 print_ref_status('X', "[no match]", ref, NULL, NULL, porcelain);
 374                 break;
 375         case REF_STATUS_REJECT_NODELETE:
 376                 print_ref_status('!', "[rejected]", ref, NULL,
 377                                                  "remote does not support deleting refs", porcelain);
 378                 break;
 379         case REF_STATUS_UPTODATE:
 380                 print_ref_status('=', "[up to date]", ref,
 381                                                  ref->peer_ref, NULL, porcelain);
 382                 break;
 383         case REF_STATUS_REJECT_NONFASTFORWARD:
 384                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 385                                                  "non-fast-forward", porcelain);
 386                 break;
 387         case REF_STATUS_REJECT_ALREADY_EXISTS:
 388                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 389                                                  "already exists", porcelain);
 390                 break;
 391         case REF_STATUS_REJECT_FETCH_FIRST:
 392                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 393                                                  "fetch first", porcelain);
 394                 break;
 395         case REF_STATUS_REJECT_NEEDS_FORCE:
 396                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 397                                                  "needs force", porcelain);
 398                 break;
 399         case REF_STATUS_REJECT_STALE:
 400                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 401                                                  "stale info", porcelain);
 402                 break;
 403         case REF_STATUS_REJECT_SHALLOW:
 404                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 405                                                  "new shallow roots not allowed", porcelain);
 406                 break;
 407         case REF_STATUS_REMOTE_REJECT:
 408                 print_ref_status('!', "[remote rejected]", ref,
 409                                                  ref->deletion ? NULL : ref->peer_ref,
 410                                                  ref->remote_status, porcelain);
 411                 break;
 412         case REF_STATUS_EXPECTING_REPORT:
 413                 print_ref_status('!', "[remote failure]", ref,
 414                                                  ref->deletion ? NULL : ref->peer_ref,
 415                                                  "remote failed to report status", porcelain);
 416                 break;
 417         case REF_STATUS_ATOMIC_PUSH_FAILED:
 418                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 419                                                  "atomic push failed", porcelain);
 420                 break;
 421         case REF_STATUS_OK:
 422                 print_ok_ref_status(ref, porcelain);
 423                 break;
 424         }
 425
 426         return 1;
 427 }
 428
 429 void transport_print_push_status(const char *dest, struct ref *refs,
 430                                   int verbose, int porcelain, unsigned int *reject_reasons)
 431 {
 432         struct ref *ref;
 433         int n = 0;
 434         unsigned char head_sha1[20];
 435         char *head;
 436
 437         head = resolve_refdup("HEAD", RESOLVE_REF_READING, head_sha1, NULL);
 438
 439         if (verbose) {
 440                 for (ref = refs; ref; ref = ref->next)
 441                         if (ref->status == REF_STATUS_UPTODATE)
 442                                 n += print_one_push_status(ref, dest, n, porcelain);
 443         }
 444
 445         for (ref = refs; ref; ref = ref->next)
 446                 if (ref->status == REF_STATUS_OK)
 447                         n += print_one_push_status(ref, dest, n, porcelain);
 448
 449         *reject_reasons = 0;
 450         for (ref = refs; ref; ref = ref->next) {
 451                 if (ref->status != REF_STATUS_NONE &&
 452                     ref->status != REF_STATUS_UPTODATE &&
 453                     ref->status != REF_STATUS_OK)
 454                         n += print_one_push_status(ref, dest, n, porcelain);
 455                 if (ref->status == REF_STATUS_REJECT_NONFASTFORWARD) {
 456                         if (head != NULL && !strcmp(head, ref->name))
 457                                 *reject_reasons |= REJECT_NON_FF_HEAD;
 458                         else
 459                                 *reject_reasons |= REJECT_NON_FF_OTHER;
 460                 } else if (ref->status == REF_STATUS_REJECT_ALREADY_EXISTS) {
 461                         *reject_reasons |= REJECT_ALREADY_EXISTS;
 462                 } else if (ref->status == REF_STATUS_REJECT_FETCH_FIRST) {
 463                         *reject_reasons |= REJECT_FETCH_FIRST;
 464                 } else if (ref->status == REF_STATUS_REJECT_NEEDS_FORCE) {
 465                         *reject_reasons |= REJECT_NEEDS_FORCE;
 466                 }
 467         }
 468         free(head);
 469 }
 470
 471 void transport_verify_remote_names(int nr_heads, const char **heads)
 472 {
 473         int i;
 474
 475         for (i = 0; i < nr_heads; i++) {
 476                 const char *local = heads[i];
 477                 const char *remote = strrchr(heads[i], ':');
 478
 479                 if (*local == '+')
 480                         local++;
 481
 482                 /* A matching refspec is okay.  */
 483                 if (remote == local && remote[1] == '\0')
 484                         continue;
 485
 486                 remote = remote ? (remote + 1) : local;
 487                 if (check_refname_format(remote,
 488                                 REFNAME_ALLOW_ONELEVEL|REFNAME_REFSPEC_PATTERN))
 489                         die("remote part of refspec is not a valid name in %s",
 490                                 heads[i]);
 491         }
 492 }
 493
 494 static int git_transport_push(struct transport *transport, struct ref *remote_refs, int flags)
 495 {
 496         struct git_transport_data *data = transport->data;
 497         struct send_pack_args args;
 498         int ret;
 499
 500         if (!data->got_remote_heads) {
 501                 struct ref *tmp_refs;
 502                 connect_setup(transport, 1);
 503
 504                 get_remote_heads(data->fd[0], NULL, 0, &tmp_refs, REF_NORMAL,
 505                                  NULL, &data->shallow);
 506                 data->got_remote_heads = 1;
 507         }
 508
 509         memset(&args, 0, sizeof(args));
 510         args.send_mirror = !!(flags & TRANSPORT_PUSH_MIRROR);
 511         args.force_update = !!(flags & TRANSPORT_PUSH_FORCE);
 512         args.use_thin_pack = data->options.thin;
 513         args.verbose = (transport->verbose > 0);
 514         args.quiet = (transport->verbose < 0);
 515         args.progress = transport->progress;
 516         args.dry_run = !!(flags & TRANSPORT_PUSH_DRY_RUN);
 517         args.porcelain = !!(flags & TRANSPORT_PUSH_PORCELAIN);
 518         args.atomic = !!(flags & TRANSPORT_PUSH_ATOMIC);
 519         args.url = transport->url;
 520
 521         if (flags & TRANSPORT_PUSH_CERT_ALWAYS)
 522                 args.push_cert = SEND_PACK_PUSH_CERT_ALWAYS;
 523         else if (flags & TRANSPORT_PUSH_CERT_IF_ASKED)
 524                 args.push_cert = SEND_PACK_PUSH_CERT_IF_ASKED;
 525         else
 526                 args.push_cert = SEND_PACK_PUSH_CERT_NEVER;
 527
 528         ret = send_pack(&args, data->fd, data->conn, remote_refs,
 529                         &data->extra_have);
 530
 531         close(data->fd[1]);
 532         close(data->fd[0]);
 533         ret |= finish_connect(data->conn);
 534         data->conn = NULL;
 535         data->got_remote_heads = 0;
 536
 537         return ret;
 538 }
 539
 540 static int connect_git(struct transport *transport, const char *name,
 541                        const char *executable, int fd[2])
 542 {
 543         struct git_transport_data *data = transport->data;
 544         data->conn = git_connect(data->fd, transport->url,
 545                                  executable, 0);
 546         fd[0] = data->fd[0];
 547         fd[1] = data->fd[1];
 548         return 0;
 549 }
 550
 551 static int disconnect_git(struct transport *transport)
 552 {
 553         struct git_transport_data *data = transport->data;
 554         if (data->conn) {
 555                 if (data->got_remote_heads)
 556                         packet_flush(data->fd[1]);
 557                 close(data->fd[0]);
 558                 close(data->fd[1]);
 559                 finish_connect(data->conn);
 560         }
 561
 562         free(data);
 563         return 0;
 564 }
 565
 566 void transport_take_over(struct transport *transport,
 567                          struct child_process *child)
 568 {
 569         struct git_transport_data *data;
 570
 571         if (!transport->smart_options)
 572                 die("Bug detected: Taking over transport requires non-NULL "
 573                     "smart_options field.");
 574
 575         data = xcalloc(1, sizeof(*data));
 576         data->options = *transport->smart_options;
 577         data->conn = child;
 578         data->fd[0] = data->conn->out;
 579         data->fd[1] = data->conn->in;
 580         data->got_remote_heads = 0;
 581         transport->data = data;
 582
 583         transport->set_option = NULL;
 584         transport->get_refs_list = get_refs_via_connect;
 585         transport->fetch = fetch_refs_via_pack;
 586         transport->push = NULL;
 587         transport->push_refs = git_transport_push;
 588         transport->disconnect = disconnect_git;
 589         transport->smart_options = &(data->options);
 590
 591         transport->cannot_reuse = 1;
 592 }
 593
 594 static int is_file(const char *url)
 595 {
 596         struct stat buf;
 597         if (stat(url, &buf))
 598                 return 0;
 599         return S_ISREG(buf.st_mode);
 600 }
 601
 602 static int external_specification_len(const char *url)
 603 {
 604         return strchr(url, ':') - url;
 605 }
 606
 607 static const struct string_list *protocol_whitelist(void)
 608 {
 609         static int enabled = -1;
 610         static struct string_list allowed = STRING_LIST_INIT_DUP;
 611
 612         if (enabled < 0) {
 613                 const char *v = getenv("GIT_ALLOW_PROTOCOL");
 614                 if (v) {
 615                         string_list_split(&allowed, v, ':', -1);
 616                         string_list_sort(&allowed);
 617                         enabled = 1;
 618                 } else {
 619                         enabled = 0;
 620                 }
 621         }
 622
 623         return enabled ? &allowed : NULL;
 624 }
 625
 626 int is_transport_allowed(const char *type)
 627 {
 628         const struct string_list *allowed = protocol_whitelist();
 629         return !allowed || string_list_has_string(allowed, type);
 630 }
 631
 632 void transport_check_allowed(const char *type)
 633 {
 634         if (!is_transport_allowed(type))
 635                 die("transport '%s' not allowed", type);
 636 }
 637
 638 int transport_restrict_protocols(void)
 639 {
 640         return !!protocol_whitelist();
 641 }
 642
 643 struct transport *transport_get(struct remote *remote, const char *url)
 644 {
 645         const char *helper;
 646         struct transport *ret = xcalloc(1, sizeof(*ret));
 647
 648         ret->progress = isatty(2);
 649
 650         if (!remote)
 651                 die("No remote provided to transport_get()");
 652
 653         ret->got_remote_refs = 0;
 654         ret->remote = remote;
 655         helper = remote->foreign_vcs;
 656
 657         if (!url && remote->url)
 658                 url = remote->url[0];
 659         ret->url = url;
 660
 661         /* maybe it is a foreign URL? */
 662         if (url) {
 663                 const char *p = url;
 664
 665                 while (is_urlschemechar(p == url, *p))
 666                         p++;
 667                 if (starts_with(p, "::"))
 668                         helper = xstrndup(url, p - url);
 669         }
 670
 671         if (helper) {
 672                 transport_helper_init(ret, helper);
 673         } else if (starts_with(url, "rsync:")) {
 674                 die("git-over-rsync is no longer supported");
 675         } else if (url_is_local_not_ssh(url) && is_file(url) && is_bundle(url, 1)) {
 676                 struct bundle_transport_data *data = xcalloc(1, sizeof(*data));
 677                 transport_check_allowed("file");
 678                 ret->data = data;
 679                 ret->get_refs_list = get_refs_from_bundle;
 680                 ret->fetch = fetch_refs_from_bundle;
 681                 ret->disconnect = close_bundle;
 682                 ret->smart_options = NULL;
 683         } else if (!is_url(url)
 684                 || starts_with(url, "file://")
 685                 || starts_with(url, "git://")
 686                 || starts_with(url, "ssh://")
 687                 || starts_with(url, "git+ssh://") /* deprecated - do not use */
 688                 || starts_with(url, "ssh+git://") /* deprecated - do not use */
 689                 ) {
 690                 /*
 691                  * These are builtin smart transports; "allowed" transports
 692                  * will be checked individually in git_connect.
 693                  */
 694                 struct git_transport_data *data = xcalloc(1, sizeof(*data));
 695                 ret->data = data;
 696                 ret->set_option = NULL;
 697                 ret->get_refs_list = get_refs_via_connect;
 698                 ret->fetch = fetch_refs_via_pack;
 699                 ret->push_refs = git_transport_push;
 700                 ret->connect = connect_git;
 701                 ret->disconnect = disconnect_git;
 702                 ret->smart_options = &(data->options);
 703
 704                 data->conn = NULL;
 705                 data->got_remote_heads = 0;
 706         } else {
 707                 /* Unknown protocol in URL. Pass to external handler. */
 708                 int len = external_specification_len(url);
 709                 char *handler = xmemdupz(url, len);
 710                 transport_helper_init(ret, handler);
 711         }
 712
 713         if (ret->smart_options) {
 714                 ret->smart_options->thin = 1;
 715                 ret->smart_options->uploadpack = "git-upload-pack";
 716                 if (remote->uploadpack)
 717                         ret->smart_options->uploadpack = remote->uploadpack;
 718                 ret->smart_options->receivepack = "git-receive-pack";
 719                 if (remote->receivepack)
 720                         ret->smart_options->receivepack = remote->receivepack;
 721         }
 722
 723         return ret;
 724 }
 725
 726 int transport_set_option(struct transport *transport,
 727                          const char *name, const char *value)
 728 {
 729         int git_reports = 1, protocol_reports = 1;
 730
 731         if (transport->smart_options)
 732                 git_reports = set_git_option(transport->smart_options,
 733                                              name, value);
 734
 735         if (transport->set_option)
 736                 protocol_reports = transport->set_option(transport, name,
 737                                                         value);
 738
 739         /* If either report is 0, report 0 (success). */
 740         if (!git_reports || !protocol_reports)
 741                 return 0;
 742         /* If either reports -1 (invalid value), report -1. */
 743         if ((git_reports == -1) || (protocol_reports == -1))
 744                 return -1;
 745         /* Otherwise if both report unknown, report unknown. */
 746         return 1;
 747 }
 748
 749 void transport_set_verbosity(struct transport *transport, int verbosity,
 750         int force_progress)
 751 {
 752         if (verbosity >= 1)
 753                 transport->verbose = verbosity <= 3 ? verbosity : 3;
 754         if (verbosity < 0)
 755                 transport->verbose = -1;
 756
 757         /**
 758          * Rules used to determine whether to report progress (processing aborts
 759          * when a rule is satisfied):
 760          *
 761          *   . Report progress, if force_progress is 1 (ie. --progress).
 762          *   . Don't report progress, if force_progress is 0 (ie. --no-progress).
 763          *   . Don't report progress, if verbosity < 0 (ie. -q/--quiet ).
 764          *   . Report progress if isatty(2) is 1.
 765          **/
 766         if (force_progress >= 0)
 767                 transport->progress = !!force_progress;
 768         else
 769                 transport->progress = verbosity >= 0 && isatty(2);
 770 }
 771
 772 static void die_with_unpushed_submodules(struct string_list *needs_pushing)
 773 {
 774         int i;
 775
 776         fprintf(stderr, "The following submodule paths contain changes that can\n"
 777                         "not be found on any remote:\n");
 778         for (i = 0; i < needs_pushing->nr; i++)
 779                 printf("  %s\n", needs_pushing->items[i].string);
 780         fprintf(stderr, "\nPlease try\n\n"
 781                         "       git push --recurse-submodules=on-demand\n\n"
 782                         "or cd to the path and use\n\n"
 783                         "       git push\n\n"
 784                         "to push them to a remote.\n\n");
 785
 786         string_list_clear(needs_pushing, 0);
 787
 788         die("Aborting.");
 789 }
 790
 791 static int run_pre_push_hook(struct transport *transport,
 792                              struct ref *remote_refs)
 793 {
 794         int ret = 0, x;
 795         struct ref *r;
 796         struct child_process proc = CHILD_PROCESS_INIT;
 797         struct strbuf buf;
 798         const char *argv[4];
 799
 800         if (!(argv[0] = find_hook("pre-push")))
 801                 return 0;
 802
 803         argv[1] = transport->remote->name;
 804         argv[2] = transport->url;
 805         argv[3] = NULL;
 806
 807         proc.argv = argv;
 808         proc.in = -1;
 809
 810         if (start_command(&proc)) {
 811                 finish_command(&proc);
 812                 return -1;
 813         }
 814
 815         sigchain_push(SIGPIPE, SIG_IGN);
 816
 817         strbuf_init(&buf, 256);
 818
 819         for (r = remote_refs; r; r = r->next) {
 820                 if (!r->peer_ref) continue;
 821                 if (r->status == REF_STATUS_REJECT_NONFASTFORWARD) continue;
 822                 if (r->status == REF_STATUS_REJECT_STALE) continue;
 823                 if (r->status == REF_STATUS_UPTODATE) continue;
 824
 825                 strbuf_reset(&buf);
 826                 strbuf_addf( &buf, "%s %s %s %s\n",
 827                          r->peer_ref->name, oid_to_hex(&r->new_oid),
 828                          r->name, oid_to_hex(&r->old_oid));
 829
 830                 if (write_in_full(proc.in, buf.buf, buf.len) < 0) {
 831                         /* We do not mind if a hook does not read all refs. */
 832                         if (errno != EPIPE)
 833                                 ret = -1;
 834                         break;
 835                 }
 836         }
 837
 838         strbuf_release(&buf);
 839
 840         x = close(proc.in);
 841         if (!ret)
 842                 ret = x;
 843
 844         sigchain_pop(SIGPIPE);
 845
 846         x = finish_command(&proc);
 847         if (!ret)
 848                 ret = x;
 849
 850         return ret;
 851 }
 852
 853 int transport_push(struct transport *transport,
 854                    int refspec_nr, const char **refspec, int flags,
 855                    unsigned int *reject_reasons)
 856 {
 857         *reject_reasons = 0;
 858         transport_verify_remote_names(refspec_nr, refspec);
 859
 860         if (transport->push) {
 861                 /* Maybe FIXME. But no important transport uses this case. */
 862                 if (flags & TRANSPORT_PUSH_SET_UPSTREAM)
 863                         die("This transport does not support using --set-upstream");
 864                 if (flags & TRANSPORT_PUSH_SET_PUBLISH)
 865                         die("This transport does not support using --set-publish");
 866
 867                 return transport->push(transport, refspec_nr, refspec, flags);
 868         } else if (transport->push_refs) {
 869                 struct ref *remote_refs;
 870                 struct ref *local_refs = get_local_heads();
 871                 int match_flags = MATCH_REFS_NONE;
 872                 int verbose = (transport->verbose > 0);
 873                 int quiet = (transport->verbose < 0);
 874                 int porcelain = flags & TRANSPORT_PUSH_PORCELAIN;
 875                 int pretend = flags & TRANSPORT_PUSH_DRY_RUN;
 876                 int push_ret, ret, err;
 877
 878                 if (check_push_refs(local_refs, refspec_nr, refspec) < 0)
 879                         return -1;
 880
 881                 remote_refs = transport->get_refs_list(transport, 1);
 882
 883                 if (flags & TRANSPORT_PUSH_ALL)
 884                         match_flags |= MATCH_REFS_ALL;
 885                 if (flags & TRANSPORT_PUSH_MIRROR)
 886                         match_flags |= MATCH_REFS_MIRROR;
 887                 if (flags & TRANSPORT_PUSH_PRUNE)
 888                         match_flags |= MATCH_REFS_PRUNE;
 889                 if (flags & TRANSPORT_PUSH_FOLLOW_TAGS)
 890                         match_flags |= MATCH_REFS_FOLLOW_TAGS;
 891
 892                 if (match_push_refs(local_refs, &remote_refs,
 893                                     refspec_nr, refspec, match_flags)) {
 894                         return -1;
 895                 }
 896
 897                 if (transport->smart_options &&
 898                     transport->smart_options->cas &&
 899                     !is_empty_cas(transport->smart_options->cas))
 900                         apply_push_cas(transport->smart_options->cas,
 901                                        transport->remote, remote_refs);
 902
 903                 set_ref_status_for_push(remote_refs,
 904                         flags & TRANSPORT_PUSH_MIRROR,
 905                         flags & TRANSPORT_PUSH_FORCE);
 906
 907                 if (!(flags & TRANSPORT_PUSH_NO_HOOK))
 908                         if (run_pre_push_hook(transport, remote_refs))
 909                                 return -1;
 910
 911                 if ((flags & TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND) && !is_bare_repository()) {
 912                         struct ref *ref = remote_refs;
 913                         for (; ref; ref = ref->next)
 914                                 if (!is_null_oid(&ref->new_oid) &&
 915                                     !push_unpushed_submodules(ref->new_oid.hash,
 916                                             transport->remote->name))
 917                                     die ("Failed to push all needed submodules!");
 918                 }
 919
 920                 if ((flags & (TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND |
 921                               TRANSPORT_RECURSE_SUBMODULES_CHECK)) && !is_bare_repository()) {
 922                         struct ref *ref = remote_refs;
 923                         struct string_list needs_pushing = STRING_LIST_INIT_DUP;
 924
 925                         for (; ref; ref = ref->next)
 926                                 if (!is_null_oid(&ref->new_oid) &&
 927                                     find_unpushed_submodules(ref->new_oid.hash,
 928                                             transport->remote->name, &needs_pushing))
 929                                         die_with_unpushed_submodules(&needs_pushing);
 930                 }
 931
 932                 push_ret = transport->push_refs(transport, remote_refs, flags);
 933                 err = push_had_errors(remote_refs);
 934                 ret = push_ret | err;
 935
 936                 if (!quiet || err)
 937                         transport_print_push_status(transport->url, remote_refs,
 938                                         verbose | porcelain, porcelain,
 939                                         reject_reasons);
 940
 941                 if (flags & TRANSPORT_PUSH_SET_UPSTREAM)
 942                         set_tracking(transport, remote_refs, pretend, 0);
 943                 if (flags & TRANSPORT_PUSH_SET_PUBLISH)
 944                         set_tracking(transport, remote_refs, pretend, 1);
 945
 946                 if (!(flags & TRANSPORT_PUSH_DRY_RUN)) {
 947                         struct ref *ref;
 948                         for (ref = remote_refs; ref; ref = ref->next)
 949                                 transport_update_tracking_ref(transport->remote, ref, verbose);
 950                 }
 951
 952                 if (porcelain && !push_ret)
 953                         puts("Done");
 954                 else if (!quiet && !ret && !transport_refs_pushed(remote_refs))
 955                         fprintf(stderr, "Everything up-to-date\n");
 956
 957                 return ret;
 958         }
 959         return 1;
 960 }
 961
 962 const struct ref *transport_get_remote_refs(struct transport *transport)
 963 {
 964         if (!transport->got_remote_refs) {
 965                 transport->remote_refs = transport->get_refs_list(transport, 0);
 966                 transport->got_remote_refs = 1;
 967         }
 968
 969         return transport->remote_refs;
 970 }
 971
 972 int transport_fetch_refs(struct transport *transport, struct ref *refs)
 973 {
 974         int rc;
 975         int nr_heads = 0, nr_alloc = 0, nr_refs = 0;
 976         struct ref **heads = NULL;
 977         struct ref *rm;
 978
 979         for (rm = refs; rm; rm = rm->next) {
 980                 nr_refs++;
 981                 if (rm->peer_ref &&
 982                     !is_null_oid(&rm->old_oid) &&
 983                     !oidcmp(&rm->peer_ref->old_oid, &rm->old_oid))
 984                         continue;
 985                 ALLOC_GROW(heads, nr_heads + 1, nr_alloc);
 986                 heads[nr_heads++] = rm;
 987         }
 988
 989         if (!nr_heads) {
 990                 /*
 991                  * When deepening of a shallow repository is requested,
 992                  * then local and remote refs are likely to still be equal.
 993                  * Just feed them all to the fetch method in that case.
 994                  * This condition shouldn't be met in a non-deepening fetch
 995                  * (see builtin/fetch.c:quickfetch()).
 996                  */
 997                 ALLOC_ARRAY(heads, nr_refs);
 998                 for (rm = refs; rm; rm = rm->next)
 999                         heads[nr_heads++] = rm;
1000         }
1001
1002         rc = transport->fetch(transport, nr_heads, heads);
1003
1004         free(heads);
1005         return rc;
1006 }
1007
1008 void transport_unlock_pack(struct transport *transport)
1009 {
1010         if (transport->pack_lockfile) {
1011                 unlink_or_warn(transport->pack_lockfile);
1012                 free(transport->pack_lockfile);
1013                 transport->pack_lockfile = NULL;
1014         }
1015 }
1016
1017 int transport_connect(struct transport *transport, const char *name,
1018                       const char *exec, int fd[2])
1019 {
1020         if (transport->connect)
1021                 return transport->connect(transport, name, exec, fd);
1022         else
1023                 die("Operation not supported by protocol");
1024 }
1025
1026 int transport_disconnect(struct transport *transport)
1027 {
1028         int ret = 0;
1029         if (transport->disconnect)
1030                 ret = transport->disconnect(transport);
1031         free(transport);
1032         return ret;
1033 }
1034
1035 /*
1036  * Strip username (and password) from a URL and return
1037  * it in a newly allocated string.
1038  */
1039 char *transport_anonymize_url(const char *url)
1040 {
1041         char *scheme_prefix, *anon_part;
1042         size_t anon_len, prefix_len = 0;
1043
1044         anon_part = strchr(url, '@');
1045         if (url_is_local_not_ssh(url) || !anon_part)
1046                 goto literal_copy;
1047
1048         anon_len = strlen(++anon_part);
1049         scheme_prefix = strstr(url, "://");
1050         if (!scheme_prefix) {
1051                 if (!strchr(anon_part, ':'))
1052                         /* cannot be "me@there:/path/name" */
1053                         goto literal_copy;
1054         } else {
1055                 const char *cp;
1056                 /* make sure scheme is reasonable */
1057                 for (cp = url; cp < scheme_prefix; cp++) {
1058                         switch (*cp) {
1059                                 /* RFC 1738 2.1 */
1060                         case '+': case '.': case '-':
1061                                 break; /* ok */
1062                         default:
1063                                 if (isalnum(*cp))
1064                                         break;
1065                                 /* it isn't */
1066                                 goto literal_copy;
1067                         }
1068                 }
1069                 /* @ past the first slash does not count */
1070                 cp = strchr(scheme_prefix + 3, '/');
1071                 if (cp && cp < anon_part)
1072                         goto literal_copy;
1073                 prefix_len = scheme_prefix - url + 3;
1074         }
1075         return xstrfmt("%.*s%.*s", (int)prefix_len, url,
1076                        (int)anon_len, anon_part);
1077 literal_copy:
1078         return xstrdup(url);
1079 }
1080
1081 struct alternate_refs_data {
1082         alternate_ref_fn *fn;
1083         void *data;
1084 };
1085
1086 static int refs_from_alternate_cb(struct alternate_object_database *e,
1087                                   void *data)
1088 {
1089         char *other;
1090         size_t len;
1091         struct remote *remote;
1092         struct transport *transport;
1093         const struct ref *extra;
1094         struct alternate_refs_data *cb = data;
1095
1096         e->name[-1] = '\0';
1097         other = xstrdup(real_path(e->base));
1098         e->name[-1] = '/';
1099         len = strlen(other);
1100
1101         while (other[len-1] == '/')
1102                 other[--len] = '\0';
1103         if (len < 8 || memcmp(other + len - 8, "/objects", 8))
1104                 goto out;
1105         /* Is this a git repository with refs? */
1106         memcpy(other + len - 8, "/refs", 6);
1107         if (!is_directory(other))
1108                 goto out;
1109         other[len - 8] = '\0';
1110         remote = remote_get(other);
1111         transport = transport_get(remote, other);
1112         for (extra = transport_get_remote_refs(transport);
1113              extra;
1114              extra = extra->next)
1115                 cb->fn(extra, cb->data);
1116         transport_disconnect(transport);
1117 out:
1118         free(other);
1119         return 0;
1120 }
1121
1122 void for_each_alternate_ref(alternate_ref_fn fn, void *data)
1123 {
1124         struct alternate_refs_data cb;
1125         cb.fn = fn;
1126         cb.data = data;
1127         foreach_alt_odb(refs_from_alternate_cb, &cb);
1128 }