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         int ret = 0;
 208         struct git_transport_data *data = transport->data;
 209         struct ref *refs;
 210         char *dest = xstrdup(transport->url);
 211         struct fetch_pack_args args;
 212         struct ref *refs_tmp = NULL;
 213
 214         memset(&args, 0, sizeof(args));
 215         args.uploadpack = data->options.uploadpack;
 216         args.keep_pack = data->options.keep;
 217         args.lock_pack = 1;
 218         args.use_thin_pack = data->options.thin;
 219         args.include_tag = data->options.followtags;
 220         args.verbose = (transport->verbose > 1);
 221         args.quiet = (transport->verbose < 0);
 222         args.no_progress = !transport->progress;
 223         args.depth = data->options.depth;
 224         args.deepen_since = data->options.deepen_since;
 225         args.deepen_not = data->options.deepen_not;
 226         args.deepen_relative = data->options.deepen_relative;
 227         args.check_self_contained_and_connected =
 228                 data->options.check_self_contained_and_connected;
 229         args.cloning = transport->cloning;
 230         args.update_shallow = data->options.update_shallow;
 231
 232         if (!data->got_remote_heads) {
 233                 connect_setup(transport, 0);
 234                 get_remote_heads(data->fd[0], NULL, 0, &refs_tmp, 0,
 235                                  NULL, &data->shallow);
 236                 data->got_remote_heads = 1;
 237         }
 238
 239         refs = fetch_pack(&args, data->fd, data->conn,
 240                           refs_tmp ? refs_tmp : transport->remote_refs,
 241                           dest, to_fetch, nr_heads, &data->shallow,
 242                           &transport->pack_lockfile);
 243         close(data->fd[0]);
 244         close(data->fd[1]);
 245         if (finish_connect(data->conn))
 246                 ret = -1;
 247         data->conn = NULL;
 248         data->got_remote_heads = 0;
 249         data->options.self_contained_and_connected =
 250                 args.self_contained_and_connected;
 251
 252         if (refs == NULL)
 253                 ret = -1;
 254         if (report_unmatched_refs(to_fetch, nr_heads))
 255                 ret = -1;
 256
 257         free_refs(refs_tmp);
 258         free_refs(refs);
 259         free(dest);
 260         return ret;
 261 }
 262
 263 static int push_had_errors(struct ref *ref)
 264 {
 265         for (; ref; ref = ref->next) {
 266                 switch (ref->status) {
 267                 case REF_STATUS_NONE:
 268                 case REF_STATUS_UPTODATE:
 269                 case REF_STATUS_OK:
 270                         break;
 271                 default:
 272                         return 1;
 273                 }
 274         }
 275         return 0;
 276 }
 277
 278 int transport_refs_pushed(struct ref *ref)
 279 {
 280         for (; ref; ref = ref->next) {
 281                 switch(ref->status) {
 282                 case REF_STATUS_NONE:
 283                 case REF_STATUS_UPTODATE:
 284                         break;
 285                 default:
 286                         return 1;
 287                 }
 288         }
 289         return 0;
 290 }
 291
 292 void transport_update_tracking_ref(struct remote *remote, struct ref *ref, int verbose)
 293 {
 294         struct refspec rs;
 295
 296         if (ref->status != REF_STATUS_OK && ref->status != REF_STATUS_UPTODATE)
 297                 return;
 298
 299         rs.src = ref->name;
 300         rs.dst = NULL;
 301
 302         if (!remote_find_tracking(remote, &rs)) {
 303                 if (verbose)
 304                         fprintf(stderr, "updating local tracking ref '%s'\n", rs.dst);
 305                 if (ref->deletion) {
 306                         delete_ref(rs.dst, NULL, 0);
 307                 } else
 308                         update_ref("update by push", rs.dst,
 309                                         ref->new_oid.hash, NULL, 0, 0);
 310                 free(rs.dst);
 311         }
 312 }
 313
 314 static void print_ref_status(char flag, const char *summary,
 315                              struct ref *to, struct ref *from, const char *msg,
 316                              int porcelain, int summary_width)
 317 {
 318         if (porcelain) {
 319                 if (from)
 320                         fprintf(stdout, "%c\t%s:%s\t", flag, from->name, to->name);
 321                 else
 322                         fprintf(stdout, "%c\t:%s\t", flag, to->name);
 323                 if (msg)
 324                         fprintf(stdout, "%s (%s)\n", summary, msg);
 325                 else
 326                         fprintf(stdout, "%s\n", summary);
 327         } else {
 328                 fprintf(stderr, " %c %-*s ", flag, summary_width, summary);
 329                 if (from)
 330                         fprintf(stderr, "%s -> %s", prettify_refname(from->name), prettify_refname(to->name));
 331                 else
 332                         fputs(prettify_refname(to->name), stderr);
 333                 if (msg) {
 334                         fputs(" (", stderr);
 335                         fputs(msg, stderr);
 336                         fputc(')', stderr);
 337                 }
 338                 fputc('\n', stderr);
 339         }
 340 }
 341
 342 static void print_ok_ref_status(struct ref *ref, int porcelain, int summary_width)
 343 {
 344         if (ref->deletion)
 345                 print_ref_status('-', "[deleted]", ref, NULL, NULL,
 346                                  porcelain, summary_width);
 347         else if (is_null_oid(&ref->old_oid))
 348                 print_ref_status('*',
 349                         (starts_with(ref->name, "refs/tags/") ? "[new tag]" :
 350                         "[new branch]"),
 351                         ref, ref->peer_ref, NULL, porcelain, summary_width);
 352         else {
 353                 struct strbuf quickref = STRBUF_INIT;
 354                 char type;
 355                 const char *msg;
 356
 357                 strbuf_add_unique_abbrev(&quickref, ref->old_oid.hash,
 358                                          DEFAULT_ABBREV);
 359                 if (ref->forced_update) {
 360                         strbuf_addstr(&quickref, "...");
 361                         type = '+';
 362                         msg = "forced update";
 363                 } else {
 364                         strbuf_addstr(&quickref, "..");
 365                         type = ' ';
 366                         msg = NULL;
 367                 }
 368                 strbuf_add_unique_abbrev(&quickref, ref->new_oid.hash,
 369                                          DEFAULT_ABBREV);
 370
 371                 print_ref_status(type, quickref.buf, ref, ref->peer_ref, msg,
 372                                  porcelain, summary_width);
 373                 strbuf_release(&quickref);
 374         }
 375 }
 376
 377 static int print_one_push_status(struct ref *ref, const char *dest, int count,
 378                                  int porcelain, int summary_width)
 379 {
 380         if (!count) {
 381                 char *url = transport_anonymize_url(dest);
 382                 fprintf(porcelain ? stdout : stderr, "To %s\n", url);
 383                 free(url);
 384         }
 385
 386         switch(ref->status) {
 387         case REF_STATUS_NONE:
 388                 print_ref_status('X', "[no match]", ref, NULL, NULL,
 389                                  porcelain, summary_width);
 390                 break;
 391         case REF_STATUS_REJECT_NODELETE:
 392                 print_ref_status('!', "[rejected]", ref, NULL,
 393                                  "remote does not support deleting refs",
 394                                  porcelain, summary_width);
 395                 break;
 396         case REF_STATUS_UPTODATE:
 397                 print_ref_status('=', "[up to date]", ref,
 398                                  ref->peer_ref, NULL, porcelain, summary_width);
 399                 break;
 400         case REF_STATUS_REJECT_NONFASTFORWARD:
 401                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 402                                  "non-fast-forward", porcelain, summary_width);
 403                 break;
 404         case REF_STATUS_REJECT_ALREADY_EXISTS:
 405                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 406                                  "already exists", porcelain, summary_width);
 407                 break;
 408         case REF_STATUS_REJECT_FETCH_FIRST:
 409                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 410                                  "fetch first", porcelain, summary_width);
 411                 break;
 412         case REF_STATUS_REJECT_NEEDS_FORCE:
 413                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 414                                  "needs force", porcelain, summary_width);
 415                 break;
 416         case REF_STATUS_REJECT_STALE:
 417                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 418                                  "stale info", porcelain, summary_width);
 419                 break;
 420         case REF_STATUS_REJECT_SHALLOW:
 421                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 422                                  "new shallow roots not allowed",
 423                                  porcelain, summary_width);
 424                 break;
 425         case REF_STATUS_REMOTE_REJECT:
 426                 print_ref_status('!', "[remote rejected]", ref,
 427                                  ref->deletion ? NULL : ref->peer_ref,
 428                                  ref->remote_status, porcelain, summary_width);
 429                 break;
 430         case REF_STATUS_EXPECTING_REPORT:
 431                 print_ref_status('!', "[remote failure]", ref,
 432                                  ref->deletion ? NULL : ref->peer_ref,
 433                                  "remote failed to report status",
 434                                  porcelain, summary_width);
 435                 break;
 436         case REF_STATUS_ATOMIC_PUSH_FAILED:
 437                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 438                                  "atomic push failed", porcelain, summary_width);
 439                 break;
 440         case REF_STATUS_OK:
 441                 print_ok_ref_status(ref, porcelain, summary_width);
 442                 break;
 443         }
 444
 445         return 1;
 446 }
 447
 448 static int measure_abbrev(const struct object_id *oid, int sofar)
 449 {
 450         char hex[GIT_SHA1_HEXSZ + 1];
 451         int w = find_unique_abbrev_r(hex, oid->hash, DEFAULT_ABBREV);
 452
 453         return (w < sofar) ? sofar : w;
 454 }
 455
 456 int transport_summary_width(const struct ref *refs)
 457 {
 458         int maxw = -1;
 459
 460         for (; refs; refs = refs->next) {
 461                 maxw = measure_abbrev(&refs->old_oid, maxw);
 462                 maxw = measure_abbrev(&refs->new_oid, maxw);
 463         }
 464         if (maxw < 0)
 465                 maxw = FALLBACK_DEFAULT_ABBREV;
 466         return (2 * maxw + 3);
 467 }
 468
 469 void transport_print_push_status(const char *dest, struct ref *refs,
 470                                   int verbose, int porcelain, unsigned int *reject_reasons)
 471 {
 472         struct ref *ref;
 473         int n = 0;
 474         unsigned char head_sha1[20];
 475         char *head;
 476         int summary_width = transport_summary_width(refs);
 477
 478         head = resolve_refdup("HEAD", RESOLVE_REF_READING, head_sha1, NULL);
 479
 480         if (verbose) {
 481                 for (ref = refs; ref; ref = ref->next)
 482                         if (ref->status == REF_STATUS_UPTODATE)
 483                                 n += print_one_push_status(ref, dest, n,
 484                                                            porcelain, summary_width);
 485         }
 486
 487         for (ref = refs; ref; ref = ref->next)
 488                 if (ref->status == REF_STATUS_OK)
 489                         n += print_one_push_status(ref, dest, n,
 490                                                    porcelain, summary_width);
 491
 492         *reject_reasons = 0;
 493         for (ref = refs; ref; ref = ref->next) {
 494                 if (ref->status != REF_STATUS_NONE &&
 495                     ref->status != REF_STATUS_UPTODATE &&
 496                     ref->status != REF_STATUS_OK)
 497                         n += print_one_push_status(ref, dest, n,
 498                                                    porcelain, summary_width);
 499                 if (ref->status == REF_STATUS_REJECT_NONFASTFORWARD) {
 500                         if (head != NULL && !strcmp(head, ref->name))
 501                                 *reject_reasons |= REJECT_NON_FF_HEAD;
 502                         else
 503                                 *reject_reasons |= REJECT_NON_FF_OTHER;
 504                 } else if (ref->status == REF_STATUS_REJECT_ALREADY_EXISTS) {
 505                         *reject_reasons |= REJECT_ALREADY_EXISTS;
 506                 } else if (ref->status == REF_STATUS_REJECT_FETCH_FIRST) {
 507                         *reject_reasons |= REJECT_FETCH_FIRST;
 508                 } else if (ref->status == REF_STATUS_REJECT_NEEDS_FORCE) {
 509                         *reject_reasons |= REJECT_NEEDS_FORCE;
 510                 }
 511         }
 512         free(head);
 513 }
 514
 515 void transport_verify_remote_names(int nr_heads, const char **heads)
 516 {
 517         int i;
 518
 519         for (i = 0; i < nr_heads; i++) {
 520                 const char *local = heads[i];
 521                 const char *remote = strrchr(heads[i], ':');
 522
 523                 if (*local == '+')
 524                         local++;
 525
 526                 /* A matching refspec is okay.  */
 527                 if (remote == local && remote[1] == '\0')
 528                         continue;
 529
 530                 remote = remote ? (remote + 1) : local;
 531                 if (check_refname_format(remote,
 532                                 REFNAME_ALLOW_ONELEVEL|REFNAME_REFSPEC_PATTERN))
 533                         die("remote part of refspec is not a valid name in %s",
 534                                 heads[i]);
 535         }
 536 }
 537
 538 static int git_transport_push(struct transport *transport, struct ref *remote_refs, int flags)
 539 {
 540         struct git_transport_data *data = transport->data;
 541         struct send_pack_args args;
 542         int ret;
 543
 544         if (!data->got_remote_heads) {
 545                 struct ref *tmp_refs;
 546                 connect_setup(transport, 1);
 547
 548                 get_remote_heads(data->fd[0], NULL, 0, &tmp_refs, REF_NORMAL,
 549                                  NULL, &data->shallow);
 550                 data->got_remote_heads = 1;
 551         }
 552
 553         memset(&args, 0, sizeof(args));
 554         args.send_mirror = !!(flags & TRANSPORT_PUSH_MIRROR);
 555         args.force_update = !!(flags & TRANSPORT_PUSH_FORCE);
 556         args.use_thin_pack = data->options.thin;
 557         args.verbose = (transport->verbose > 0);
 558         args.quiet = (transport->verbose < 0);
 559         args.progress = transport->progress;
 560         args.dry_run = !!(flags & TRANSPORT_PUSH_DRY_RUN);
 561         args.porcelain = !!(flags & TRANSPORT_PUSH_PORCELAIN);
 562         args.atomic = !!(flags & TRANSPORT_PUSH_ATOMIC);
 563         args.push_options = transport->push_options;
 564         args.url = transport->url;
 565
 566         if (flags & TRANSPORT_PUSH_CERT_ALWAYS)
 567                 args.push_cert = SEND_PACK_PUSH_CERT_ALWAYS;
 568         else if (flags & TRANSPORT_PUSH_CERT_IF_ASKED)
 569                 args.push_cert = SEND_PACK_PUSH_CERT_IF_ASKED;
 570         else
 571                 args.push_cert = SEND_PACK_PUSH_CERT_NEVER;
 572
 573         ret = send_pack(&args, data->fd, data->conn, remote_refs,
 574                         &data->extra_have);
 575
 576         close(data->fd[1]);
 577         close(data->fd[0]);
 578         ret |= finish_connect(data->conn);
 579         data->conn = NULL;
 580         data->got_remote_heads = 0;
 581
 582         return ret;
 583 }
 584
 585 static int connect_git(struct transport *transport, const char *name,
 586                        const char *executable, int fd[2])
 587 {
 588         struct git_transport_data *data = transport->data;
 589         data->conn = git_connect(data->fd, transport->url,
 590                                  executable, 0);
 591         fd[0] = data->fd[0];
 592         fd[1] = data->fd[1];
 593         return 0;
 594 }
 595
 596 static int disconnect_git(struct transport *transport)
 597 {
 598         struct git_transport_data *data = transport->data;
 599         if (data->conn) {
 600                 if (data->got_remote_heads)
 601                         packet_flush(data->fd[1]);
 602                 close(data->fd[0]);
 603                 close(data->fd[1]);
 604                 finish_connect(data->conn);
 605         }
 606
 607         free(data);
 608         return 0;
 609 }
 610
 611 void transport_take_over(struct transport *transport,
 612                          struct child_process *child)
 613 {
 614         struct git_transport_data *data;
 615
 616         if (!transport->smart_options)
 617                 die("BUG: taking over transport requires non-NULL "
 618                     "smart_options field.");
 619
 620         data = xcalloc(1, sizeof(*data));
 621         data->options = *transport->smart_options;
 622         data->conn = child;
 623         data->fd[0] = data->conn->out;
 624         data->fd[1] = data->conn->in;
 625         data->got_remote_heads = 0;
 626         transport->data = data;
 627
 628         transport->set_option = NULL;
 629         transport->get_refs_list = get_refs_via_connect;
 630         transport->fetch = fetch_refs_via_pack;
 631         transport->push = NULL;
 632         transport->push_refs = git_transport_push;
 633         transport->disconnect = disconnect_git;
 634         transport->smart_options = &(data->options);
 635
 636         transport->cannot_reuse = 1;
 637 }
 638
 639 static int is_file(const char *url)
 640 {
 641         struct stat buf;
 642         if (stat(url, &buf))
 643                 return 0;
 644         return S_ISREG(buf.st_mode);
 645 }
 646
 647 static int external_specification_len(const char *url)
 648 {
 649         return strchr(url, ':') - url;
 650 }
 651
 652 static const struct string_list *protocol_whitelist(void)
 653 {
 654         static int enabled = -1;
 655         static struct string_list allowed = STRING_LIST_INIT_DUP;
 656
 657         if (enabled < 0) {
 658                 const char *v = getenv("GIT_ALLOW_PROTOCOL");
 659                 if (v) {
 660                         string_list_split(&allowed, v, ':', -1);
 661                         string_list_sort(&allowed);
 662                         enabled = 1;
 663                 } else {
 664                         enabled = 0;
 665                 }
 666         }
 667
 668         return enabled ? &allowed : NULL;
 669 }
 670
 671 int is_transport_allowed(const char *type)
 672 {
 673         const struct string_list *allowed = protocol_whitelist();
 674         return !allowed || string_list_has_string(allowed, type);
 675 }
 676
 677 void transport_check_allowed(const char *type)
 678 {
 679         if (!is_transport_allowed(type))
 680                 die("transport '%s' not allowed", type);
 681 }
 682
 683 int transport_restrict_protocols(void)
 684 {
 685         return !!protocol_whitelist();
 686 }
 687
 688 struct transport *transport_get(struct remote *remote, const char *url)
 689 {
 690         const char *helper;
 691         struct transport *ret = xcalloc(1, sizeof(*ret));
 692
 693         ret->progress = isatty(2);
 694
 695         if (!remote)
 696                 die("No remote provided to transport_get()");
 697
 698         ret->got_remote_refs = 0;
 699         ret->remote = remote;
 700         helper = remote->foreign_vcs;
 701
 702         if (!url && remote->url)
 703                 url = remote->url[0];
 704         ret->url = url;
 705
 706         /* maybe it is a foreign URL? */
 707         if (url) {
 708                 const char *p = url;
 709
 710                 while (is_urlschemechar(p == url, *p))
 711                         p++;
 712                 if (starts_with(p, "::"))
 713                         helper = xstrndup(url, p - url);
 714         }
 715
 716         if (helper) {
 717                 transport_helper_init(ret, helper);
 718         } else if (starts_with(url, "rsync:")) {
 719                 die("git-over-rsync is no longer supported");
 720         } else if (url_is_local_not_ssh(url) && is_file(url) && is_bundle(url, 1)) {
 721                 struct bundle_transport_data *data = xcalloc(1, sizeof(*data));
 722                 transport_check_allowed("file");
 723                 ret->data = data;
 724                 ret->get_refs_list = get_refs_from_bundle;
 725                 ret->fetch = fetch_refs_from_bundle;
 726                 ret->disconnect = close_bundle;
 727                 ret->smart_options = NULL;
 728         } else if (!is_url(url)
 729                 || starts_with(url, "file://")
 730                 || starts_with(url, "git://")
 731                 || starts_with(url, "ssh://")
 732                 || starts_with(url, "git+ssh://") /* deprecated - do not use */
 733                 || starts_with(url, "ssh+git://") /* deprecated - do not use */
 734                 ) {
 735                 /*
 736                  * These are builtin smart transports; "allowed" transports
 737                  * will be checked individually in git_connect.
 738                  */
 739                 struct git_transport_data *data = xcalloc(1, sizeof(*data));
 740                 ret->data = data;
 741                 ret->set_option = NULL;
 742                 ret->get_refs_list = get_refs_via_connect;
 743                 ret->fetch = fetch_refs_via_pack;
 744                 ret->push_refs = git_transport_push;
 745                 ret->connect = connect_git;
 746                 ret->disconnect = disconnect_git;
 747                 ret->smart_options = &(data->options);
 748
 749                 data->conn = NULL;
 750                 data->got_remote_heads = 0;
 751         } else {
 752                 /* Unknown protocol in URL. Pass to external handler. */
 753                 int len = external_specification_len(url);
 754                 char *handler = xmemdupz(url, len);
 755                 transport_helper_init(ret, handler);
 756         }
 757
 758         if (ret->smart_options) {
 759                 ret->smart_options->thin = 1;
 760                 ret->smart_options->uploadpack = "git-upload-pack";
 761                 if (remote->uploadpack)
 762                         ret->smart_options->uploadpack = remote->uploadpack;
 763                 ret->smart_options->receivepack = "git-receive-pack";
 764                 if (remote->receivepack)
 765                         ret->smart_options->receivepack = remote->receivepack;
 766         }
 767
 768         return ret;
 769 }
 770
 771 int transport_set_option(struct transport *transport,
 772                          const char *name, const char *value)
 773 {
 774         int git_reports = 1, protocol_reports = 1;
 775
 776         if (transport->smart_options)
 777                 git_reports = set_git_option(transport->smart_options,
 778                                              name, value);
 779
 780         if (transport->set_option)
 781                 protocol_reports = transport->set_option(transport, name,
 782                                                         value);
 783
 784         /* If either report is 0, report 0 (success). */
 785         if (!git_reports || !protocol_reports)
 786                 return 0;
 787         /* If either reports -1 (invalid value), report -1. */
 788         if ((git_reports == -1) || (protocol_reports == -1))
 789                 return -1;
 790         /* Otherwise if both report unknown, report unknown. */
 791         return 1;
 792 }
 793
 794 void transport_set_verbosity(struct transport *transport, int verbosity,
 795         int force_progress)
 796 {
 797         if (verbosity >= 1)
 798                 transport->verbose = verbosity <= 3 ? verbosity : 3;
 799         if (verbosity < 0)
 800                 transport->verbose = -1;
 801
 802         /**
 803          * Rules used to determine whether to report progress (processing aborts
 804          * when a rule is satisfied):
 805          *
 806          *   . Report progress, if force_progress is 1 (ie. --progress).
 807          *   . Don't report progress, if force_progress is 0 (ie. --no-progress).
 808          *   . Don't report progress, if verbosity < 0 (ie. -q/--quiet ).
 809          *   . Report progress if isatty(2) is 1.
 810          **/
 811         if (force_progress >= 0)
 812                 transport->progress = !!force_progress;
 813         else
 814                 transport->progress = verbosity >= 0 && isatty(2);
 815 }
 816
 817 static void die_with_unpushed_submodules(struct string_list *needs_pushing)
 818 {
 819         int i;
 820
 821         fprintf(stderr, _("The following submodule paths contain changes that can\n"
 822                         "not be found on any remote:\n"));
 823         for (i = 0; i < needs_pushing->nr; i++)
 824                 fprintf(stderr, "  %s\n", needs_pushing->items[i].string);
 825         fprintf(stderr, _("\nPlease try\n\n"
 826                           "     git push --recurse-submodules=on-demand\n\n"
 827                           "or cd to the path and use\n\n"
 828                           "     git push\n\n"
 829                           "to push them to a remote.\n\n"));
 830
 831         string_list_clear(needs_pushing, 0);
 832
 833         die(_("Aborting."));
 834 }
 835
 836 static int run_pre_push_hook(struct transport *transport,
 837                              struct ref *remote_refs)
 838 {
 839         int ret = 0, x;
 840         struct ref *r;
 841         struct child_process proc = CHILD_PROCESS_INIT;
 842         struct strbuf buf;
 843         const char *argv[4];
 844
 845         if (!(argv[0] = find_hook("pre-push")))
 846                 return 0;
 847
 848         argv[1] = transport->remote->name;
 849         argv[2] = transport->url;
 850         argv[3] = NULL;
 851
 852         proc.argv = argv;
 853         proc.in = -1;
 854
 855         if (start_command(&proc)) {
 856                 finish_command(&proc);
 857                 return -1;
 858         }
 859
 860         sigchain_push(SIGPIPE, SIG_IGN);
 861
 862         strbuf_init(&buf, 256);
 863
 864         for (r = remote_refs; r; r = r->next) {
 865                 if (!r->peer_ref) continue;
 866                 if (r->status == REF_STATUS_REJECT_NONFASTFORWARD) continue;
 867                 if (r->status == REF_STATUS_REJECT_STALE) continue;
 868                 if (r->status == REF_STATUS_UPTODATE) continue;
 869
 870                 strbuf_reset(&buf);
 871                 strbuf_addf( &buf, "%s %s %s %s\n",
 872                          r->peer_ref->name, oid_to_hex(&r->new_oid),
 873                          r->name, oid_to_hex(&r->old_oid));
 874
 875                 if (write_in_full(proc.in, buf.buf, buf.len) < 0) {
 876                         /* We do not mind if a hook does not read all refs. */
 877                         if (errno != EPIPE)
 878                                 ret = -1;
 879                         break;
 880                 }
 881         }
 882
 883         strbuf_release(&buf);
 884
 885         x = close(proc.in);
 886         if (!ret)
 887                 ret = x;
 888
 889         sigchain_pop(SIGPIPE);
 890
 891         x = finish_command(&proc);
 892         if (!ret)
 893                 ret = x;
 894
 895         return ret;
 896 }
 897
 898 int transport_push(struct transport *transport,
 899                    int refspec_nr, const char **refspec, int flags,
 900                    unsigned int *reject_reasons)
 901 {
 902         *reject_reasons = 0;
 903         transport_verify_remote_names(refspec_nr, refspec);
 904
 905         if (transport->push) {
 906                 /* Maybe FIXME. But no important transport uses this case. */
 907                 if (flags & TRANSPORT_PUSH_SET_UPSTREAM)
 908                         die("This transport does not support using --set-upstream");
 909
 910                 return transport->push(transport, refspec_nr, refspec, flags);
 911         } else if (transport->push_refs) {
 912                 struct ref *remote_refs;
 913                 struct ref *local_refs = get_local_heads();
 914                 int match_flags = MATCH_REFS_NONE;
 915                 int verbose = (transport->verbose > 0);
 916                 int quiet = (transport->verbose < 0);
 917                 int porcelain = flags & TRANSPORT_PUSH_PORCELAIN;
 918                 int pretend = flags & TRANSPORT_PUSH_DRY_RUN;
 919                 int push_ret, ret, err;
 920
 921                 if (check_push_refs(local_refs, refspec_nr, refspec) < 0)
 922                         return -1;
 923
 924                 remote_refs = transport->get_refs_list(transport, 1);
 925
 926                 if (flags & TRANSPORT_PUSH_ALL)
 927                         match_flags |= MATCH_REFS_ALL;
 928                 if (flags & TRANSPORT_PUSH_MIRROR)
 929                         match_flags |= MATCH_REFS_MIRROR;
 930                 if (flags & TRANSPORT_PUSH_PRUNE)
 931                         match_flags |= MATCH_REFS_PRUNE;
 932                 if (flags & TRANSPORT_PUSH_FOLLOW_TAGS)
 933                         match_flags |= MATCH_REFS_FOLLOW_TAGS;
 934
 935                 if (match_push_refs(local_refs, &remote_refs,
 936                                     refspec_nr, refspec, match_flags)) {
 937                         return -1;
 938                 }
 939
 940                 if (transport->smart_options &&
 941                     transport->smart_options->cas &&
 942                     !is_empty_cas(transport->smart_options->cas))
 943                         apply_push_cas(transport->smart_options->cas,
 944                                        transport->remote, remote_refs);
 945
 946                 set_ref_status_for_push(remote_refs,
 947                         flags & TRANSPORT_PUSH_MIRROR,
 948                         flags & TRANSPORT_PUSH_FORCE);
 949
 950                 if (!(flags & TRANSPORT_PUSH_NO_HOOK))
 951                         if (run_pre_push_hook(transport, remote_refs))
 952                                 return -1;
 953
 954                 if ((flags & TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND) && !is_bare_repository()) {
 955                         struct ref *ref = remote_refs;
 956                         struct sha1_array commits = SHA1_ARRAY_INIT;
 957
 958                         for (; ref; ref = ref->next)
 959                                 if (!is_null_oid(&ref->new_oid))
 960                                         sha1_array_append(&commits, ref->new_oid.hash);
 961
 962                         if (!push_unpushed_submodules(&commits,
 963                                                       transport->remote->name,
 964                                                       pretend)) {
 965                                 sha1_array_clear(&commits);
 966                                 die("Failed to push all needed submodules!");
 967                         }
 968                         sha1_array_clear(&commits);
 969                 }
 970
 971                 if (((flags & TRANSPORT_RECURSE_SUBMODULES_CHECK) ||
 972                      ((flags & TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND) &&
 973                       !pretend)) && !is_bare_repository()) {
 974                         struct ref *ref = remote_refs;
 975                         struct string_list needs_pushing = STRING_LIST_INIT_DUP;
 976                         struct sha1_array commits = SHA1_ARRAY_INIT;
 977
 978                         for (; ref; ref = ref->next)
 979                                 if (!is_null_oid(&ref->new_oid))
 980                                         sha1_array_append(&commits, ref->new_oid.hash);
 981
 982                         if (find_unpushed_submodules(&commits, transport->remote->name,
 983                                                 &needs_pushing)) {
 984                                 sha1_array_clear(&commits);
 985                                 die_with_unpushed_submodules(&needs_pushing);
 986                         }
 987                         string_list_clear(&needs_pushing, 0);
 988                         sha1_array_clear(&commits);
 989                 }
 990
 991                 push_ret = transport->push_refs(transport, remote_refs, flags);
 992                 err = push_had_errors(remote_refs);
 993                 ret = push_ret | err;
 994
 995                 if (!quiet || err)
 996                         transport_print_push_status(transport->url, remote_refs,
 997                                         verbose | porcelain, porcelain,
 998                                         reject_reasons);
 999
1000                 if (flags & TRANSPORT_PUSH_SET_UPSTREAM)
1001                         set_upstreams(transport, remote_refs, pretend);
1002
1003                 if (!(flags & TRANSPORT_PUSH_DRY_RUN)) {
1004                         struct ref *ref;
1005                         for (ref = remote_refs; ref; ref = ref->next)
1006                                 transport_update_tracking_ref(transport->remote, ref, verbose);
1007                 }
1008
1009                 if (porcelain && !push_ret)
1010                         puts("Done");
1011                 else if (!quiet && !ret && !transport_refs_pushed(remote_refs))
1012                         fprintf(stderr, "Everything up-to-date\n");
1013
1014                 return ret;
1015         }
1016         return 1;
1017 }
1018
1019 const struct ref *transport_get_remote_refs(struct transport *transport)
1020 {
1021         if (!transport->got_remote_refs) {
1022                 transport->remote_refs = transport->get_refs_list(transport, 0);
1023                 transport->got_remote_refs = 1;
1024         }
1025
1026         return transport->remote_refs;
1027 }
1028
1029 int transport_fetch_refs(struct transport *transport, struct ref *refs)
1030 {
1031         int rc;
1032         int nr_heads = 0, nr_alloc = 0, nr_refs = 0;
1033         struct ref **heads = NULL;
1034         struct ref *rm;
1035
1036         for (rm = refs; rm; rm = rm->next) {
1037                 nr_refs++;
1038                 if (rm->peer_ref &&
1039                     !is_null_oid(&rm->old_oid) &&
1040                     !oidcmp(&rm->peer_ref->old_oid, &rm->old_oid))
1041                         continue;
1042                 ALLOC_GROW(heads, nr_heads + 1, nr_alloc);
1043                 heads[nr_heads++] = rm;
1044         }
1045
1046         if (!nr_heads) {
1047                 /*
1048                  * When deepening of a shallow repository is requested,
1049                  * then local and remote refs are likely to still be equal.
1050                  * Just feed them all to the fetch method in that case.
1051                  * This condition shouldn't be met in a non-deepening fetch
1052                  * (see builtin/fetch.c:quickfetch()).
1053                  */
1054                 ALLOC_ARRAY(heads, nr_refs);
1055                 for (rm = refs; rm; rm = rm->next)
1056                         heads[nr_heads++] = rm;
1057         }
1058
1059         rc = transport->fetch(transport, nr_heads, heads);
1060
1061         free(heads);
1062         return rc;
1063 }
1064
1065 void transport_unlock_pack(struct transport *transport)
1066 {
1067         if (transport->pack_lockfile) {
1068                 unlink_or_warn(transport->pack_lockfile);
1069                 free(transport->pack_lockfile);
1070                 transport->pack_lockfile = NULL;
1071         }
1072 }
1073
1074 int transport_connect(struct transport *transport, const char *name,
1075                       const char *exec, int fd[2])
1076 {
1077         if (transport->connect)
1078                 return transport->connect(transport, name, exec, fd);
1079         else
1080                 die("Operation not supported by protocol");
1081 }
1082
1083 int transport_disconnect(struct transport *transport)
1084 {
1085         int ret = 0;
1086         if (transport->disconnect)
1087                 ret = transport->disconnect(transport);
1088         free(transport);
1089         return ret;
1090 }
1091
1092 /*
1093  * Strip username (and password) from a URL and return
1094  * it in a newly allocated string.
1095  */
1096 char *transport_anonymize_url(const char *url)
1097 {
1098         char *scheme_prefix, *anon_part;
1099         size_t anon_len, prefix_len = 0;
1100
1101         anon_part = strchr(url, '@');
1102         if (url_is_local_not_ssh(url) || !anon_part)
1103                 goto literal_copy;
1104
1105         anon_len = strlen(++anon_part);
1106         scheme_prefix = strstr(url, "://");
1107         if (!scheme_prefix) {
1108                 if (!strchr(anon_part, ':'))
1109                         /* cannot be "me@there:/path/name" */
1110                         goto literal_copy;
1111         } else {
1112                 const char *cp;
1113                 /* make sure scheme is reasonable */
1114                 for (cp = url; cp < scheme_prefix; cp++) {
1115                         switch (*cp) {
1116                                 /* RFC 1738 2.1 */
1117                         case '+': case '.': case '-':
1118                                 break; /* ok */
1119                         default:
1120                                 if (isalnum(*cp))
1121                                         break;
1122                                 /* it isn't */
1123                                 goto literal_copy;
1124                         }
1125                 }
1126                 /* @ past the first slash does not count */
1127                 cp = strchr(scheme_prefix + 3, '/');
1128                 if (cp && cp < anon_part)
1129                         goto literal_copy;
1130                 prefix_len = scheme_prefix - url + 3;
1131         }
1132         return xstrfmt("%.*s%.*s", (int)prefix_len, url,
1133                        (int)anon_len, anon_part);
1134 literal_copy:
1135         return xstrdup(url);
1136 }
1137
1138 struct alternate_refs_data {
1139         alternate_ref_fn *fn;
1140         void *data;
1141 };
1142
1143 static int refs_from_alternate_cb(struct alternate_object_database *e,
1144                                   void *data)
1145 {
1146         char *other;
1147         size_t len;
1148         struct remote *remote;
1149         struct transport *transport;
1150         const struct ref *extra;
1151         struct alternate_refs_data *cb = data;
1152
1153         other = xstrdup(real_path(e->path));
1154         len = strlen(other);
1155
1156         while (other[len-1] == '/')
1157                 other[--len] = '\0';
1158         if (len < 8 || memcmp(other + len - 8, "/objects", 8))
1159                 goto out;
1160         /* Is this a git repository with refs? */
1161         memcpy(other + len - 8, "/refs", 6);
1162         if (!is_directory(other))
1163                 goto out;
1164         other[len - 8] = '\0';
1165         remote = remote_get(other);
1166         transport = transport_get(remote, other);
1167         for (extra = transport_get_remote_refs(transport);
1168              extra;
1169              extra = extra->next)
1170                 cb->fn(extra, cb->data);
1171         transport_disconnect(transport);
1172 out:
1173         free(other);
1174         return 0;
1175 }
1176
1177 void for_each_alternate_ref(alternate_ref_fn fn, void *data)
1178 {
1179         struct alternate_refs_data cb;
1180         cb.fn = fn;
1181         cb.data = data;
1182         foreach_alt_odb(refs_from_alternate_cb, &cb);
1183 }