transport.c

   1 #include "cache.h"
   2 #include "transport.h"
   3 #include "run-command.h"
   4 #include "pkt-line.h"
   5 #include "fetch-pack.h"
   6 #include "remote.h"
   7 #include "connect.h"
   8 #include "send-pack.h"
   9 #include "walker.h"
  10 #include "bundle.h"
  11 #include "dir.h"
  12 #include "refs.h"
  13 #include "branch.h"
  14 #include "url.h"
  15 #include "submodule.h"
  16 #include "string-list.h"
  17 #include "sha1-array.h"
  18 #include "sigchain.h"
  19
  20 static void set_upstreams(struct transport *transport, struct ref *refs,
  21         int pretend)
  22 {
  23         struct ref *ref;
  24         for (ref = refs; ref; ref = ref->next) {
  25                 const char *localname;
  26                 const char *tmp;
  27                 const char *remotename;
  28                 unsigned char sha[20];
  29                 int flag = 0;
  30                 /*
  31                  * Check suitability for tracking. Must be successful /
  32                  * already up-to-date ref create/modify (not delete).
  33                  */
  34                 if (ref->status != REF_STATUS_OK &&
  35                         ref->status != REF_STATUS_UPTODATE)
  36                         continue;
  37                 if (!ref->peer_ref)
  38                         continue;
  39                 if (is_null_oid(&ref->new_oid))
  40                         continue;
  41
  42                 /* Follow symbolic refs (mainly for HEAD). */
  43                 localname = ref->peer_ref->name;
  44                 remotename = ref->name;
  45                 tmp = resolve_ref_unsafe(localname, RESOLVE_REF_READING,
  46                                          sha, &flag);
  47                 if (tmp && flag & REF_ISSYMREF &&
  48                         starts_with(tmp, "refs/heads/"))
  49                         localname = tmp;
  50
  51                 /* Both source and destination must be local branches. */
  52                 if (!localname || !starts_with(localname, "refs/heads/"))
  53                         continue;
  54                 if (!remotename || !starts_with(remotename, "refs/heads/"))
  55                         continue;
  56
  57                 if (!pretend)
  58                         install_branch_config(BRANCH_CONFIG_VERBOSE,
  59                                 localname + 11, transport->remote->name,
  60                                 remotename);
  61                 else
  62                         printf(_("Would set upstream of '%s' to '%s' of '%s'\n"),
  63                                 localname + 11, remotename + 11,
  64                                 transport->remote->name);
  65         }
  66 }
  67
  68 struct bundle_transport_data {
  69         int fd;
  70         struct bundle_header header;
  71 };
  72
  73 static struct ref *get_refs_from_bundle(struct transport *transport, int for_push)
  74 {
  75         struct bundle_transport_data *data = transport->data;
  76         struct ref *result = NULL;
  77         int i;
  78
  79         if (for_push)
  80                 return NULL;
  81
  82         if (data->fd > 0)
  83                 close(data->fd);
  84         data->fd = read_bundle_header(transport->url, &data->header);
  85         if (data->fd < 0)
  86                 die ("Could not read bundle '%s'.", transport->url);
  87         for (i = 0; i < data->header.references.nr; i++) {
  88                 struct ref_list_entry *e = data->header.references.list + i;
  89                 struct ref *ref = alloc_ref(e->name);
  90                 hashcpy(ref->old_oid.hash, e->sha1);
  91                 ref->next = result;
  92                 result = ref;
  93         }
  94         return result;
  95 }
  96
  97 static int fetch_refs_from_bundle(struct transport *transport,
  98                                int nr_heads, struct ref **to_fetch)
  99 {
 100         struct bundle_transport_data *data = transport->data;
 101         return unbundle(&data->header, data->fd,
 102                         transport->progress ? BUNDLE_VERBOSE : 0);
 103 }
 104
 105 static int close_bundle(struct transport *transport)
 106 {
 107         struct bundle_transport_data *data = transport->data;
 108         if (data->fd > 0)
 109                 close(data->fd);
 110         free(data);
 111         return 0;
 112 }
 113
 114 struct git_transport_data {
 115         struct git_transport_options options;
 116         struct child_process *conn;
 117         int fd[2];
 118         unsigned got_remote_heads : 1;
 119         struct sha1_array extra_have;
 120         struct sha1_array shallow;
 121 };
 122
 123 static int set_git_option(struct git_transport_options *opts,
 124                           const char *name, const char *value)
 125 {
 126         if (!strcmp(name, TRANS_OPT_UPLOADPACK)) {
 127                 opts->uploadpack = value;
 128                 return 0;
 129         } else if (!strcmp(name, TRANS_OPT_RECEIVEPACK)) {
 130                 opts->receivepack = value;
 131                 return 0;
 132         } else if (!strcmp(name, TRANS_OPT_THIN)) {
 133                 opts->thin = !!value;
 134                 return 0;
 135         } else if (!strcmp(name, TRANS_OPT_FOLLOWTAGS)) {
 136                 opts->followtags = !!value;
 137                 return 0;
 138         } else if (!strcmp(name, TRANS_OPT_KEEP)) {
 139                 opts->keep = !!value;
 140                 return 0;
 141         } else if (!strcmp(name, TRANS_OPT_UPDATE_SHALLOW)) {
 142                 opts->update_shallow = !!value;
 143                 return 0;
 144         } else if (!strcmp(name, TRANS_OPT_DEPTH)) {
 145                 if (!value)
 146                         opts->depth = 0;
 147                 else {
 148                         char *end;
 149                         opts->depth = strtol(value, &end, 0);
 150                         if (*end)
 151                                 die(_("transport: invalid depth option '%s'"), value);
 152                 }
 153                 return 0;
 154         } else if (!strcmp(name, TRANS_OPT_DEEPEN_SINCE)) {
 155                 opts->deepen_since = value;
 156                 return 0;
 157         } else if (!strcmp(name, TRANS_OPT_DEEPEN_NOT)) {
 158                 opts->deepen_not = (const struct string_list *)value;
 159                 return 0;
 160         } else if (!strcmp(name, TRANS_OPT_DEEPEN_RELATIVE)) {
 161                 opts->deepen_relative = !!value;
 162                 return 0;
 163         }
 164         return 1;
 165 }
 166
 167 static int connect_setup(struct transport *transport, int for_push)
 168 {
 169         struct git_transport_data *data = transport->data;
 170         int flags = transport->verbose > 0 ? CONNECT_VERBOSE : 0;
 171
 172         if (data->conn)
 173                 return 0;
 174
 175         switch (transport->family) {
 176         case TRANSPORT_FAMILY_ALL: break;
 177         case TRANSPORT_FAMILY_IPV4: flags |= CONNECT_IPV4; break;
 178         case TRANSPORT_FAMILY_IPV6: flags |= CONNECT_IPV6; break;
 179         }
 180
 181         data->conn = git_connect(data->fd, transport->url,
 182                                  for_push ? data->options.receivepack :
 183                                  data->options.uploadpack,
 184                                  flags);
 185
 186         return 0;
 187 }
 188
 189 static struct ref *get_refs_via_connect(struct transport *transport, int for_push)
 190 {
 191         struct git_transport_data *data = transport->data;
 192         struct ref *refs;
 193
 194         connect_setup(transport, for_push);
 195         get_remote_heads(data->fd[0], NULL, 0, &refs,
 196                          for_push ? REF_NORMAL : 0,
 197                          &data->extra_have,
 198                          &data->shallow);
 199         data->got_remote_heads = 1;
 200
 201         return refs;
 202 }
 203
 204 static int fetch_refs_via_pack(struct transport *transport,
 205                                int nr_heads, struct ref **to_fetch)
 206 {
 207         struct git_transport_data *data = transport->data;
 208         struct ref *refs;
 209         char *dest = xstrdup(transport->url);
 210         struct fetch_pack_args args;
 211         struct ref *refs_tmp = NULL;
 212
 213         memset(&args, 0, sizeof(args));
 214         args.uploadpack = data->options.uploadpack;
 215         args.keep_pack = data->options.keep;
 216         args.lock_pack = 1;
 217         args.use_thin_pack = data->options.thin;
 218         args.include_tag = data->options.followtags;
 219         args.verbose = (transport->verbose > 1);
 220         args.quiet = (transport->verbose < 0);
 221         args.no_progress = !transport->progress;
 222         args.depth = data->options.depth;
 223         args.deepen_since = data->options.deepen_since;
 224         args.deepen_not = data->options.deepen_not;
 225         args.deepen_relative = data->options.deepen_relative;
 226         args.check_self_contained_and_connected =
 227                 data->options.check_self_contained_and_connected;
 228         args.cloning = transport->cloning;
 229         args.update_shallow = data->options.update_shallow;
 230
 231         if (!data->got_remote_heads) {
 232                 connect_setup(transport, 0);
 233                 get_remote_heads(data->fd[0], NULL, 0, &refs_tmp, 0,
 234                                  NULL, &data->shallow);
 235                 data->got_remote_heads = 1;
 236         }
 237
 238         refs = fetch_pack(&args, data->fd, data->conn,
 239                           refs_tmp ? refs_tmp : transport->remote_refs,
 240                           dest, to_fetch, nr_heads, &data->shallow,
 241                           &transport->pack_lockfile);
 242         close(data->fd[0]);
 243         close(data->fd[1]);
 244         if (finish_connect(data->conn)) {
 245                 free_refs(refs);
 246                 refs = NULL;
 247         }
 248         data->conn = NULL;
 249         data->got_remote_heads = 0;
 250         data->options.self_contained_and_connected =
 251                 args.self_contained_and_connected;
 252
 253         free_refs(refs_tmp);
 254         free_refs(refs);
 255         free(dest);
 256         return (refs ? 0 : -1);
 257 }
 258
 259 static int push_had_errors(struct ref *ref)
 260 {
 261         for (; ref; ref = ref->next) {
 262                 switch (ref->status) {
 263                 case REF_STATUS_NONE:
 264                 case REF_STATUS_UPTODATE:
 265                 case REF_STATUS_OK:
 266                         break;
 267                 default:
 268                         return 1;
 269                 }
 270         }
 271         return 0;
 272 }
 273
 274 int transport_refs_pushed(struct ref *ref)
 275 {
 276         for (; ref; ref = ref->next) {
 277                 switch(ref->status) {
 278                 case REF_STATUS_NONE:
 279                 case REF_STATUS_UPTODATE:
 280                         break;
 281                 default:
 282                         return 1;
 283                 }
 284         }
 285         return 0;
 286 }
 287
 288 void transport_update_tracking_ref(struct remote *remote, struct ref *ref, int verbose)
 289 {
 290         struct refspec rs;
 291
 292         if (ref->status != REF_STATUS_OK && ref->status != REF_STATUS_UPTODATE)
 293                 return;
 294
 295         rs.src = ref->name;
 296         rs.dst = NULL;
 297
 298         if (!remote_find_tracking(remote, &rs)) {
 299                 if (verbose)
 300                         fprintf(stderr, "updating local tracking ref '%s'\n", rs.dst);
 301                 if (ref->deletion) {
 302                         delete_ref(rs.dst, NULL, 0);
 303                 } else
 304                         update_ref("update by push", rs.dst,
 305                                         ref->new_oid.hash, NULL, 0, 0);
 306                 free(rs.dst);
 307         }
 308 }
 309
 310 static void print_ref_status(char flag, const char *summary,
 311                              struct ref *to, struct ref *from, const char *msg,
 312                              int porcelain, int summary_width)
 313 {
 314         if (porcelain) {
 315                 if (from)
 316                         fprintf(stdout, "%c\t%s:%s\t", flag, from->name, to->name);
 317                 else
 318                         fprintf(stdout, "%c\t:%s\t", flag, to->name);
 319                 if (msg)
 320                         fprintf(stdout, "%s (%s)\n", summary, msg);
 321                 else
 322                         fprintf(stdout, "%s\n", summary);
 323         } else {
 324                 fprintf(stderr, " %c %-*s ", flag, summary_width, summary);
 325                 if (from)
 326                         fprintf(stderr, "%s -> %s", prettify_refname(from->name), prettify_refname(to->name));
 327                 else
 328                         fputs(prettify_refname(to->name), stderr);
 329                 if (msg) {
 330                         fputs(" (", stderr);
 331                         fputs(msg, stderr);
 332                         fputc(')', stderr);
 333                 }
 334                 fputc('\n', stderr);
 335         }
 336 }
 337
 338 static void print_ok_ref_status(struct ref *ref, int porcelain, int summary_width)
 339 {
 340         if (ref->deletion)
 341                 print_ref_status('-', "[deleted]", ref, NULL, NULL,
 342                                  porcelain, summary_width);
 343         else if (is_null_oid(&ref->old_oid))
 344                 print_ref_status('*',
 345                         (starts_with(ref->name, "refs/tags/") ? "[new tag]" :
 346                         "[new branch]"),
 347                         ref, ref->peer_ref, NULL, porcelain, summary_width);
 348         else {
 349                 struct strbuf quickref = STRBUF_INIT;
 350                 char type;
 351                 const char *msg;
 352
 353                 strbuf_add_unique_abbrev(&quickref, ref->old_oid.hash,
 354                                          DEFAULT_ABBREV);
 355                 if (ref->forced_update) {
 356                         strbuf_addstr(&quickref, "...");
 357                         type = '+';
 358                         msg = "forced update";
 359                 } else {
 360                         strbuf_addstr(&quickref, "..");
 361                         type = ' ';
 362                         msg = NULL;
 363                 }
 364                 strbuf_add_unique_abbrev(&quickref, ref->new_oid.hash,
 365                                          DEFAULT_ABBREV);
 366
 367                 print_ref_status(type, quickref.buf, ref, ref->peer_ref, msg,
 368                                  porcelain, summary_width);
 369                 strbuf_release(&quickref);
 370         }
 371 }
 372
 373 static int print_one_push_status(struct ref *ref, const char *dest, int count,
 374                                  int porcelain, int summary_width)
 375 {
 376         if (!count) {
 377                 char *url = transport_anonymize_url(dest);
 378                 fprintf(porcelain ? stdout : stderr, "To %s\n", url);
 379                 free(url);
 380         }
 381
 382         switch(ref->status) {
 383         case REF_STATUS_NONE:
 384                 print_ref_status('X', "[no match]", ref, NULL, NULL,
 385                                  porcelain, summary_width);
 386                 break;
 387         case REF_STATUS_REJECT_NODELETE:
 388                 print_ref_status('!', "[rejected]", ref, NULL,
 389                                  "remote does not support deleting refs",
 390                                  porcelain, summary_width);
 391                 break;
 392         case REF_STATUS_UPTODATE:
 393                 print_ref_status('=', "[up to date]", ref,
 394                                  ref->peer_ref, NULL, porcelain, summary_width);
 395                 break;
 396         case REF_STATUS_REJECT_NONFASTFORWARD:
 397                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 398                                  "non-fast-forward", porcelain, summary_width);
 399                 break;
 400         case REF_STATUS_REJECT_ALREADY_EXISTS:
 401                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 402                                  "already exists", porcelain, summary_width);
 403                 break;
 404         case REF_STATUS_REJECT_FETCH_FIRST:
 405                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 406                                  "fetch first", porcelain, summary_width);
 407                 break;
 408         case REF_STATUS_REJECT_NEEDS_FORCE:
 409                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 410                                  "needs force", porcelain, summary_width);
 411                 break;
 412         case REF_STATUS_REJECT_STALE:
 413                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 414                                  "stale info", porcelain, summary_width);
 415                 break;
 416         case REF_STATUS_REJECT_SHALLOW:
 417                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 418                                  "new shallow roots not allowed",
 419                                  porcelain, summary_width);
 420                 break;
 421         case REF_STATUS_REMOTE_REJECT:
 422                 print_ref_status('!', "[remote rejected]", ref,
 423                                  ref->deletion ? NULL : ref->peer_ref,
 424                                  ref->remote_status, porcelain, summary_width);
 425                 break;
 426         case REF_STATUS_EXPECTING_REPORT:
 427                 print_ref_status('!', "[remote failure]", ref,
 428                                  ref->deletion ? NULL : ref->peer_ref,
 429                                  "remote failed to report status",
 430                                  porcelain, summary_width);
 431                 break;
 432         case REF_STATUS_ATOMIC_PUSH_FAILED:
 433                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 434                                  "atomic push failed", porcelain, summary_width);
 435                 break;
 436         case REF_STATUS_OK:
 437                 print_ok_ref_status(ref, porcelain, summary_width);
 438                 break;
 439         }
 440
 441         return 1;
 442 }
 443
 444 static int measure_abbrev(const struct object_id *oid, int sofar)
 445 {
 446         char hex[GIT_SHA1_HEXSZ + 1];
 447         int w = find_unique_abbrev_r(hex, oid->hash, DEFAULT_ABBREV);
 448
 449         return (w < sofar) ? sofar : w;
 450 }
 451
 452 int transport_summary_width(const struct ref *refs)
 453 {
 454         int maxw = -1;
 455
 456         for (; refs; refs = refs->next) {
 457                 maxw = measure_abbrev(&refs->old_oid, maxw);
 458                 maxw = measure_abbrev(&refs->new_oid, maxw);
 459         }
 460         if (maxw < 0)
 461                 maxw = FALLBACK_DEFAULT_ABBREV;
 462         return (2 * maxw + 3);
 463 }
 464
 465 void transport_print_push_status(const char *dest, struct ref *refs,
 466                                   int verbose, int porcelain, unsigned int *reject_reasons)
 467 {
 468         struct ref *ref;
 469         int n = 0;
 470         unsigned char head_sha1[20];
 471         char *head;
 472         int summary_width = transport_summary_width(refs);
 473
 474         head = resolve_refdup("HEAD", RESOLVE_REF_READING, head_sha1, NULL);
 475
 476         if (verbose) {
 477                 for (ref = refs; ref; ref = ref->next)
 478                         if (ref->status == REF_STATUS_UPTODATE)
 479                                 n += print_one_push_status(ref, dest, n,
 480                                                            porcelain, summary_width);
 481         }
 482
 483         for (ref = refs; ref; ref = ref->next)
 484                 if (ref->status == REF_STATUS_OK)
 485                         n += print_one_push_status(ref, dest, n,
 486                                                    porcelain, summary_width);
 487
 488         *reject_reasons = 0;
 489         for (ref = refs; ref; ref = ref->next) {
 490                 if (ref->status != REF_STATUS_NONE &&
 491                     ref->status != REF_STATUS_UPTODATE &&
 492                     ref->status != REF_STATUS_OK)
 493                         n += print_one_push_status(ref, dest, n,
 494                                                    porcelain, summary_width);
 495                 if (ref->status == REF_STATUS_REJECT_NONFASTFORWARD) {
 496                         if (head != NULL && !strcmp(head, ref->name))
 497                                 *reject_reasons |= REJECT_NON_FF_HEAD;
 498                         else
 499                                 *reject_reasons |= REJECT_NON_FF_OTHER;
 500                 } else if (ref->status == REF_STATUS_REJECT_ALREADY_EXISTS) {
 501                         *reject_reasons |= REJECT_ALREADY_EXISTS;
 502                 } else if (ref->status == REF_STATUS_REJECT_FETCH_FIRST) {
 503                         *reject_reasons |= REJECT_FETCH_FIRST;
 504                 } else if (ref->status == REF_STATUS_REJECT_NEEDS_FORCE) {
 505                         *reject_reasons |= REJECT_NEEDS_FORCE;
 506                 }
 507         }
 508         free(head);
 509 }
 510
 511 void transport_verify_remote_names(int nr_heads, const char **heads)
 512 {
 513         int i;
 514
 515         for (i = 0; i < nr_heads; i++) {
 516                 const char *local = heads[i];
 517                 const char *remote = strrchr(heads[i], ':');
 518
 519                 if (*local == '+')
 520                         local++;
 521
 522                 /* A matching refspec is okay.  */
 523                 if (remote == local && remote[1] == '\0')
 524                         continue;
 525
 526                 remote = remote ? (remote + 1) : local;
 527                 if (check_refname_format(remote,
 528                                 REFNAME_ALLOW_ONELEVEL|REFNAME_REFSPEC_PATTERN))
 529                         die("remote part of refspec is not a valid name in %s",
 530                                 heads[i]);
 531         }
 532 }
 533
 534 static int git_transport_push(struct transport *transport, struct ref *remote_refs, int flags)
 535 {
 536         struct git_transport_data *data = transport->data;
 537         struct send_pack_args args;
 538         int ret;
 539
 540         if (!data->got_remote_heads) {
 541                 struct ref *tmp_refs;
 542                 connect_setup(transport, 1);
 543
 544                 get_remote_heads(data->fd[0], NULL, 0, &tmp_refs, REF_NORMAL,
 545                                  NULL, &data->shallow);
 546                 data->got_remote_heads = 1;
 547         }
 548
 549         memset(&args, 0, sizeof(args));
 550         args.send_mirror = !!(flags & TRANSPORT_PUSH_MIRROR);
 551         args.force_update = !!(flags & TRANSPORT_PUSH_FORCE);
 552         args.use_thin_pack = data->options.thin;
 553         args.verbose = (transport->verbose > 0);
 554         args.quiet = (transport->verbose < 0);
 555         args.progress = transport->progress;
 556         args.dry_run = !!(flags & TRANSPORT_PUSH_DRY_RUN);
 557         args.porcelain = !!(flags & TRANSPORT_PUSH_PORCELAIN);
 558         args.atomic = !!(flags & TRANSPORT_PUSH_ATOMIC);
 559         args.push_options = transport->push_options;
 560         args.url = transport->url;
 561
 562         if (flags & TRANSPORT_PUSH_CERT_ALWAYS)
 563                 args.push_cert = SEND_PACK_PUSH_CERT_ALWAYS;
 564         else if (flags & TRANSPORT_PUSH_CERT_IF_ASKED)
 565                 args.push_cert = SEND_PACK_PUSH_CERT_IF_ASKED;
 566         else
 567                 args.push_cert = SEND_PACK_PUSH_CERT_NEVER;
 568
 569         ret = send_pack(&args, data->fd, data->conn, remote_refs,
 570                         &data->extra_have);
 571
 572         close(data->fd[1]);
 573         close(data->fd[0]);
 574         ret |= finish_connect(data->conn);
 575         data->conn = NULL;
 576         data->got_remote_heads = 0;
 577
 578         return ret;
 579 }
 580
 581 static int connect_git(struct transport *transport, const char *name,
 582                        const char *executable, int fd[2])
 583 {
 584         struct git_transport_data *data = transport->data;
 585         data->conn = git_connect(data->fd, transport->url,
 586                                  executable, 0);
 587         fd[0] = data->fd[0];
 588         fd[1] = data->fd[1];
 589         return 0;
 590 }
 591
 592 static int disconnect_git(struct transport *transport)
 593 {
 594         struct git_transport_data *data = transport->data;
 595         if (data->conn) {
 596                 if (data->got_remote_heads)
 597                         packet_flush(data->fd[1]);
 598                 close(data->fd[0]);
 599                 close(data->fd[1]);
 600                 finish_connect(data->conn);
 601         }
 602
 603         free(data);
 604         return 0;
 605 }
 606
 607 void transport_take_over(struct transport *transport,
 608                          struct child_process *child)
 609 {
 610         struct git_transport_data *data;
 611
 612         if (!transport->smart_options)
 613                 die("BUG: taking over transport requires non-NULL "
 614                     "smart_options field.");
 615
 616         data = xcalloc(1, sizeof(*data));
 617         data->options = *transport->smart_options;
 618         data->conn = child;
 619         data->fd[0] = data->conn->out;
 620         data->fd[1] = data->conn->in;
 621         data->got_remote_heads = 0;
 622         transport->data = data;
 623
 624         transport->set_option = NULL;
 625         transport->get_refs_list = get_refs_via_connect;
 626         transport->fetch = fetch_refs_via_pack;
 627         transport->push = NULL;
 628         transport->push_refs = git_transport_push;
 629         transport->disconnect = disconnect_git;
 630         transport->smart_options = &(data->options);
 631
 632         transport->cannot_reuse = 1;
 633 }
 634
 635 static int is_file(const char *url)
 636 {
 637         struct stat buf;
 638         if (stat(url, &buf))
 639                 return 0;
 640         return S_ISREG(buf.st_mode);
 641 }
 642
 643 static int external_specification_len(const char *url)
 644 {
 645         return strchr(url, ':') - url;
 646 }
 647
 648 static const struct string_list *protocol_whitelist(void)
 649 {
 650         static int enabled = -1;
 651         static struct string_list allowed = STRING_LIST_INIT_DUP;
 652
 653         if (enabled < 0) {
 654                 const char *v = getenv("GIT_ALLOW_PROTOCOL");
 655                 if (v) {
 656                         string_list_split(&allowed, v, ':', -1);
 657                         string_list_sort(&allowed);
 658                         enabled = 1;
 659                 } else {
 660                         enabled = 0;
 661                 }
 662         }
 663
 664         return enabled ? &allowed : NULL;
 665 }
 666
 667 int is_transport_allowed(const char *type)
 668 {
 669         const struct string_list *allowed = protocol_whitelist();
 670         return !allowed || string_list_has_string(allowed, type);
 671 }
 672
 673 void transport_check_allowed(const char *type)
 674 {
 675         if (!is_transport_allowed(type))
 676                 die("transport '%s' not allowed", type);
 677 }
 678
 679 int transport_restrict_protocols(void)
 680 {
 681         return !!protocol_whitelist();
 682 }
 683
 684 struct transport *transport_get(struct remote *remote, const char *url)
 685 {
 686         const char *helper;
 687         struct transport *ret = xcalloc(1, sizeof(*ret));
 688
 689         ret->progress = isatty(2);
 690
 691         if (!remote)
 692                 die("No remote provided to transport_get()");
 693
 694         ret->got_remote_refs = 0;
 695         ret->remote = remote;
 696         helper = remote->foreign_vcs;
 697
 698         if (!url && remote->url)
 699                 url = remote->url[0];
 700         ret->url = url;
 701
 702         /* maybe it is a foreign URL? */
 703         if (url) {
 704                 const char *p = url;
 705
 706                 while (is_urlschemechar(p == url, *p))
 707                         p++;
 708                 if (starts_with(p, "::"))
 709                         helper = xstrndup(url, p - url);
 710         }
 711
 712         if (helper) {
 713                 transport_helper_init(ret, helper);
 714         } else if (starts_with(url, "rsync:")) {
 715                 die("git-over-rsync is no longer supported");
 716         } else if (url_is_local_not_ssh(url) && is_file(url) && is_bundle(url, 1)) {
 717                 struct bundle_transport_data *data = xcalloc(1, sizeof(*data));
 718                 transport_check_allowed("file");
 719                 ret->data = data;
 720                 ret->get_refs_list = get_refs_from_bundle;
 721                 ret->fetch = fetch_refs_from_bundle;
 722                 ret->disconnect = close_bundle;
 723                 ret->smart_options = NULL;
 724         } else if (!is_url(url)
 725                 || starts_with(url, "file://")
 726                 || starts_with(url, "git://")
 727                 || starts_with(url, "ssh://")
 728                 || starts_with(url, "git+ssh://") /* deprecated - do not use */
 729                 || starts_with(url, "ssh+git://") /* deprecated - do not use */
 730                 ) {
 731                 /*
 732                  * These are builtin smart transports; "allowed" transports
 733                  * will be checked individually in git_connect.
 734                  */
 735                 struct git_transport_data *data = xcalloc(1, sizeof(*data));
 736                 ret->data = data;
 737                 ret->set_option = NULL;
 738                 ret->get_refs_list = get_refs_via_connect;
 739                 ret->fetch = fetch_refs_via_pack;
 740                 ret->push_refs = git_transport_push;
 741                 ret->connect = connect_git;
 742                 ret->disconnect = disconnect_git;
 743                 ret->smart_options = &(data->options);
 744
 745                 data->conn = NULL;
 746                 data->got_remote_heads = 0;
 747         } else {
 748                 /* Unknown protocol in URL. Pass to external handler. */
 749                 int len = external_specification_len(url);
 750                 char *handler = xmemdupz(url, len);
 751                 transport_helper_init(ret, handler);
 752         }
 753
 754         if (ret->smart_options) {
 755                 ret->smart_options->thin = 1;
 756                 ret->smart_options->uploadpack = "git-upload-pack";
 757                 if (remote->uploadpack)
 758                         ret->smart_options->uploadpack = remote->uploadpack;
 759                 ret->smart_options->receivepack = "git-receive-pack";
 760                 if (remote->receivepack)
 761                         ret->smart_options->receivepack = remote->receivepack;
 762         }
 763
 764         return ret;
 765 }
 766
 767 int transport_set_option(struct transport *transport,
 768                          const char *name, const char *value)
 769 {
 770         int git_reports = 1, protocol_reports = 1;
 771
 772         if (transport->smart_options)
 773                 git_reports = set_git_option(transport->smart_options,
 774                                              name, value);
 775
 776         if (transport->set_option)
 777                 protocol_reports = transport->set_option(transport, name,
 778                                                         value);
 779
 780         /* If either report is 0, report 0 (success). */
 781         if (!git_reports || !protocol_reports)
 782                 return 0;
 783         /* If either reports -1 (invalid value), report -1. */
 784         if ((git_reports == -1) || (protocol_reports == -1))
 785                 return -1;
 786         /* Otherwise if both report unknown, report unknown. */
 787         return 1;
 788 }
 789
 790 void transport_set_verbosity(struct transport *transport, int verbosity,
 791         int force_progress)
 792 {
 793         if (verbosity >= 1)
 794                 transport->verbose = verbosity <= 3 ? verbosity : 3;
 795         if (verbosity < 0)
 796                 transport->verbose = -1;
 797
 798         /**
 799          * Rules used to determine whether to report progress (processing aborts
 800          * when a rule is satisfied):
 801          *
 802          *   . Report progress, if force_progress is 1 (ie. --progress).
 803          *   . Don't report progress, if force_progress is 0 (ie. --no-progress).
 804          *   . Don't report progress, if verbosity < 0 (ie. -q/--quiet ).
 805          *   . Report progress if isatty(2) is 1.
 806          **/
 807         if (force_progress >= 0)
 808                 transport->progress = !!force_progress;
 809         else
 810                 transport->progress = verbosity >= 0 && isatty(2);
 811 }
 812
 813 static void die_with_unpushed_submodules(struct string_list *needs_pushing)
 814 {
 815         int i;
 816
 817         fprintf(stderr, _("The following submodule paths contain changes that can\n"
 818                         "not be found on any remote:\n"));
 819         for (i = 0; i < needs_pushing->nr; i++)
 820                 fprintf(stderr, "  %s\n", needs_pushing->items[i].string);
 821         fprintf(stderr, _("\nPlease try\n\n"
 822                           "     git push --recurse-submodules=on-demand\n\n"
 823                           "or cd to the path and use\n\n"
 824                           "     git push\n\n"
 825                           "to push them to a remote.\n\n"));
 826
 827         string_list_clear(needs_pushing, 0);
 828
 829         die(_("Aborting."));
 830 }
 831
 832 static int run_pre_push_hook(struct transport *transport,
 833                              struct ref *remote_refs)
 834 {
 835         int ret = 0, x;
 836         struct ref *r;
 837         struct child_process proc = CHILD_PROCESS_INIT;
 838         struct strbuf buf;
 839         const char *argv[4];
 840
 841         if (!(argv[0] = find_hook("pre-push")))
 842                 return 0;
 843
 844         argv[1] = transport->remote->name;
 845         argv[2] = transport->url;
 846         argv[3] = NULL;
 847
 848         proc.argv = argv;
 849         proc.in = -1;
 850
 851         if (start_command(&proc)) {
 852                 finish_command(&proc);
 853                 return -1;
 854         }
 855
 856         sigchain_push(SIGPIPE, SIG_IGN);
 857
 858         strbuf_init(&buf, 256);
 859
 860         for (r = remote_refs; r; r = r->next) {
 861                 if (!r->peer_ref) continue;
 862                 if (r->status == REF_STATUS_REJECT_NONFASTFORWARD) continue;
 863                 if (r->status == REF_STATUS_REJECT_STALE) continue;
 864                 if (r->status == REF_STATUS_UPTODATE) continue;
 865
 866                 strbuf_reset(&buf);
 867                 strbuf_addf( &buf, "%s %s %s %s\n",
 868                          r->peer_ref->name, oid_to_hex(&r->new_oid),
 869                          r->name, oid_to_hex(&r->old_oid));
 870
 871                 if (write_in_full(proc.in, buf.buf, buf.len) < 0) {
 872                         /* We do not mind if a hook does not read all refs. */
 873                         if (errno != EPIPE)
 874                                 ret = -1;
 875                         break;
 876                 }
 877         }
 878
 879         strbuf_release(&buf);
 880
 881         x = close(proc.in);
 882         if (!ret)
 883                 ret = x;
 884
 885         sigchain_pop(SIGPIPE);
 886
 887         x = finish_command(&proc);
 888         if (!ret)
 889                 ret = x;
 890
 891         return ret;
 892 }
 893
 894 int transport_push(struct transport *transport,
 895                    int refspec_nr, const char **refspec, int flags,
 896                    unsigned int *reject_reasons)
 897 {
 898         *reject_reasons = 0;
 899         transport_verify_remote_names(refspec_nr, refspec);
 900
 901         if (transport->push) {
 902                 /* Maybe FIXME. But no important transport uses this case. */
 903                 if (flags & TRANSPORT_PUSH_SET_UPSTREAM)
 904                         die("This transport does not support using --set-upstream");
 905
 906                 return transport->push(transport, refspec_nr, refspec, flags);
 907         } else if (transport->push_refs) {
 908                 struct ref *remote_refs;
 909                 struct ref *local_refs = get_local_heads();
 910                 int match_flags = MATCH_REFS_NONE;
 911                 int verbose = (transport->verbose > 0);
 912                 int quiet = (transport->verbose < 0);
 913                 int porcelain = flags & TRANSPORT_PUSH_PORCELAIN;
 914                 int pretend = flags & TRANSPORT_PUSH_DRY_RUN;
 915                 int push_ret, ret, err;
 916
 917                 if (check_push_refs(local_refs, refspec_nr, refspec) < 0)
 918                         return -1;
 919
 920                 remote_refs = transport->get_refs_list(transport, 1);
 921
 922                 if (flags & TRANSPORT_PUSH_ALL)
 923                         match_flags |= MATCH_REFS_ALL;
 924                 if (flags & TRANSPORT_PUSH_MIRROR)
 925                         match_flags |= MATCH_REFS_MIRROR;
 926                 if (flags & TRANSPORT_PUSH_PRUNE)
 927                         match_flags |= MATCH_REFS_PRUNE;
 928                 if (flags & TRANSPORT_PUSH_FOLLOW_TAGS)
 929                         match_flags |= MATCH_REFS_FOLLOW_TAGS;
 930
 931                 if (match_push_refs(local_refs, &remote_refs,
 932                                     refspec_nr, refspec, match_flags)) {
 933                         return -1;
 934                 }
 935
 936                 if (transport->smart_options &&
 937                     transport->smart_options->cas &&
 938                     !is_empty_cas(transport->smart_options->cas))
 939                         apply_push_cas(transport->smart_options->cas,
 940                                        transport->remote, remote_refs);
 941
 942                 set_ref_status_for_push(remote_refs,
 943                         flags & TRANSPORT_PUSH_MIRROR,
 944                         flags & TRANSPORT_PUSH_FORCE);
 945
 946                 if (!(flags & TRANSPORT_PUSH_NO_HOOK))
 947                         if (run_pre_push_hook(transport, remote_refs))
 948                                 return -1;
 949
 950                 if ((flags & TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND) && !is_bare_repository()) {
 951                         struct ref *ref = remote_refs;
 952                         for (; ref; ref = ref->next)
 953                                 if (!is_null_oid(&ref->new_oid) &&
 954                                     !push_unpushed_submodules(ref->new_oid.hash,
 955                                             transport->remote->name))
 956                                     die ("Failed to push all needed submodules!");
 957                 }
 958
 959                 if ((flags & (TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND |
 960                               TRANSPORT_RECURSE_SUBMODULES_CHECK)) && !is_bare_repository()) {
 961                         struct ref *ref = remote_refs;
 962                         struct string_list needs_pushing = STRING_LIST_INIT_DUP;
 963
 964                         for (; ref; ref = ref->next)
 965                                 if (!is_null_oid(&ref->new_oid) &&
 966                                     find_unpushed_submodules(ref->new_oid.hash,
 967                                             transport->remote->name, &needs_pushing))
 968                                         die_with_unpushed_submodules(&needs_pushing);
 969                 }
 970
 971                 push_ret = transport->push_refs(transport, remote_refs, flags);
 972                 err = push_had_errors(remote_refs);
 973                 ret = push_ret | err;
 974
 975                 if (!quiet || err)
 976                         transport_print_push_status(transport->url, remote_refs,
 977                                         verbose | porcelain, porcelain,
 978                                         reject_reasons);
 979
 980                 if (flags & TRANSPORT_PUSH_SET_UPSTREAM)
 981                         set_upstreams(transport, remote_refs, pretend);
 982
 983                 if (!(flags & TRANSPORT_PUSH_DRY_RUN)) {
 984                         struct ref *ref;
 985                         for (ref = remote_refs; ref; ref = ref->next)
 986                                 transport_update_tracking_ref(transport->remote, ref, verbose);
 987                 }
 988
 989                 if (porcelain && !push_ret)
 990                         puts("Done");
 991                 else if (!quiet && !ret && !transport_refs_pushed(remote_refs))
 992                         fprintf(stderr, "Everything up-to-date\n");
 993
 994                 return ret;
 995         }
 996         return 1;
 997 }
 998
 999 const struct ref *transport_get_remote_refs(struct transport *transport)
1000 {
1001         if (!transport->got_remote_refs) {
1002                 transport->remote_refs = transport->get_refs_list(transport, 0);
1003                 transport->got_remote_refs = 1;
1004         }
1005
1006         return transport->remote_refs;
1007 }
1008
1009 int transport_fetch_refs(struct transport *transport, struct ref *refs)
1010 {
1011         int rc;
1012         int nr_heads = 0, nr_alloc = 0, nr_refs = 0;
1013         struct ref **heads = NULL;
1014         struct ref *rm;
1015
1016         for (rm = refs; rm; rm = rm->next) {
1017                 nr_refs++;
1018                 if (rm->peer_ref &&
1019                     !is_null_oid(&rm->old_oid) &&
1020                     !oidcmp(&rm->peer_ref->old_oid, &rm->old_oid))
1021                         continue;
1022                 ALLOC_GROW(heads, nr_heads + 1, nr_alloc);
1023                 heads[nr_heads++] = rm;
1024         }
1025
1026         if (!nr_heads) {
1027                 /*
1028                  * When deepening of a shallow repository is requested,
1029                  * then local and remote refs are likely to still be equal.
1030                  * Just feed them all to the fetch method in that case.
1031                  * This condition shouldn't be met in a non-deepening fetch
1032                  * (see builtin/fetch.c:quickfetch()).
1033                  */
1034                 ALLOC_ARRAY(heads, nr_refs);
1035                 for (rm = refs; rm; rm = rm->next)
1036                         heads[nr_heads++] = rm;
1037         }
1038
1039         rc = transport->fetch(transport, nr_heads, heads);
1040
1041         free(heads);
1042         return rc;
1043 }
1044
1045 void transport_unlock_pack(struct transport *transport)
1046 {
1047         if (transport->pack_lockfile) {
1048                 unlink_or_warn(transport->pack_lockfile);
1049                 free(transport->pack_lockfile);
1050                 transport->pack_lockfile = NULL;
1051         }
1052 }
1053
1054 int transport_connect(struct transport *transport, const char *name,
1055                       const char *exec, int fd[2])
1056 {
1057         if (transport->connect)
1058                 return transport->connect(transport, name, exec, fd);
1059         else
1060                 die("Operation not supported by protocol");
1061 }
1062
1063 int transport_disconnect(struct transport *transport)
1064 {
1065         int ret = 0;
1066         if (transport->disconnect)
1067                 ret = transport->disconnect(transport);
1068         free(transport);
1069         return ret;
1070 }
1071
1072 /*
1073  * Strip username (and password) from a URL and return
1074  * it in a newly allocated string.
1075  */
1076 char *transport_anonymize_url(const char *url)
1077 {
1078         char *scheme_prefix, *anon_part;
1079         size_t anon_len, prefix_len = 0;
1080
1081         anon_part = strchr(url, '@');
1082         if (url_is_local_not_ssh(url) || !anon_part)
1083                 goto literal_copy;
1084
1085         anon_len = strlen(++anon_part);
1086         scheme_prefix = strstr(url, "://");
1087         if (!scheme_prefix) {
1088                 if (!strchr(anon_part, ':'))
1089                         /* cannot be "me@there:/path/name" */
1090                         goto literal_copy;
1091         } else {
1092                 const char *cp;
1093                 /* make sure scheme is reasonable */
1094                 for (cp = url; cp < scheme_prefix; cp++) {
1095                         switch (*cp) {
1096                                 /* RFC 1738 2.1 */
1097                         case '+': case '.': case '-':
1098                                 break; /* ok */
1099                         default:
1100                                 if (isalnum(*cp))
1101                                         break;
1102                                 /* it isn't */
1103                                 goto literal_copy;
1104                         }
1105                 }
1106                 /* @ past the first slash does not count */
1107                 cp = strchr(scheme_prefix + 3, '/');
1108                 if (cp && cp < anon_part)
1109                         goto literal_copy;
1110                 prefix_len = scheme_prefix - url + 3;
1111         }
1112         return xstrfmt("%.*s%.*s", (int)prefix_len, url,
1113                        (int)anon_len, anon_part);
1114 literal_copy:
1115         return xstrdup(url);
1116 }
1117
1118 struct alternate_refs_data {
1119         alternate_ref_fn *fn;
1120         void *data;
1121 };
1122
1123 static int refs_from_alternate_cb(struct alternate_object_database *e,
1124                                   void *data)
1125 {
1126         char *other;
1127         size_t len;
1128         struct remote *remote;
1129         struct transport *transport;
1130         const struct ref *extra;
1131         struct alternate_refs_data *cb = data;
1132
1133         other = xstrdup(real_path(e->path));
1134         len = strlen(other);
1135
1136         while (other[len-1] == '/')
1137                 other[--len] = '\0';
1138         if (len < 8 || memcmp(other + len - 8, "/objects", 8))
1139                 goto out;
1140         /* Is this a git repository with refs? */
1141         memcpy(other + len - 8, "/refs", 6);
1142         if (!is_directory(other))
1143                 goto out;
1144         other[len - 8] = '\0';
1145         remote = remote_get(other);
1146         transport = transport_get(remote, other);
1147         for (extra = transport_get_remote_refs(transport);
1148              extra;
1149              extra = extra->next)
1150                 cb->fn(extra, cb->data);
1151         transport_disconnect(transport);
1152 out:
1153         free(other);
1154         return 0;
1155 }
1156
1157 void for_each_alternate_ref(alternate_ref_fn fn, void *data)
1158 {
1159         struct alternate_refs_data cb;
1160         cb.fn = fn;
1161         cb.data = data;
1162         foreach_alt_odb(refs_from_alternate_cb, &cb);
1163 }