transport.c

   1 #include "cache.h"
   2 #include "config.h"
   3 #include "transport.h"
   4 #include "run-command.h"
   5 #include "pkt-line.h"
   6 #include "fetch-pack.h"
   7 #include "remote.h"
   8 #include "connect.h"
   9 #include "send-pack.h"
  10 #include "walker.h"
  11 #include "bundle.h"
  12 #include "dir.h"
  13 #include "refs.h"
  14 #include "branch.h"
  15 #include "url.h"
  16 #include "submodule.h"
  17 #include "string-list.h"
  18 #include "sha1-array.h"
  19 #include "sigchain.h"
  20
  21 static void set_upstreams(struct transport *transport, struct ref *refs,
  22         int pretend)
  23 {
  24         struct ref *ref;
  25         for (ref = refs; ref; ref = ref->next) {
  26                 const char *localname;
  27                 const char *tmp;
  28                 const char *remotename;
  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                                          NULL, &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                 oidcpy(&ref->old_oid, &e->oid);
  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 oid_array extra_have;
 120         struct oid_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(NULL, 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_MAX_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         char *head;
 475         int summary_width = transport_summary_width(refs);
 476
 477         head = resolve_refdup("HEAD", RESOLVE_REF_READING, NULL, NULL);
 478
 479         if (verbose) {
 480                 for (ref = refs; ref; ref = ref->next)
 481                         if (ref->status == REF_STATUS_UPTODATE)
 482                                 n += print_one_push_status(ref, dest, n,
 483                                                            porcelain, summary_width);
 484         }
 485
 486         for (ref = refs; ref; ref = ref->next)
 487                 if (ref->status == REF_STATUS_OK)
 488                         n += print_one_push_status(ref, dest, n,
 489                                                    porcelain, summary_width);
 490
 491         *reject_reasons = 0;
 492         for (ref = refs; ref; ref = ref->next) {
 493                 if (ref->status != REF_STATUS_NONE &&
 494                     ref->status != REF_STATUS_UPTODATE &&
 495                     ref->status != REF_STATUS_OK)
 496                         n += print_one_push_status(ref, dest, n,
 497                                                    porcelain, summary_width);
 498                 if (ref->status == REF_STATUS_REJECT_NONFASTFORWARD) {
 499                         if (head != NULL && !strcmp(head, ref->name))
 500                                 *reject_reasons |= REJECT_NON_FF_HEAD;
 501                         else
 502                                 *reject_reasons |= REJECT_NON_FF_OTHER;
 503                 } else if (ref->status == REF_STATUS_REJECT_ALREADY_EXISTS) {
 504                         *reject_reasons |= REJECT_ALREADY_EXISTS;
 505                 } else if (ref->status == REF_STATUS_REJECT_FETCH_FIRST) {
 506                         *reject_reasons |= REJECT_FETCH_FIRST;
 507                 } else if (ref->status == REF_STATUS_REJECT_NEEDS_FORCE) {
 508                         *reject_reasons |= REJECT_NEEDS_FORCE;
 509                 }
 510         }
 511         free(head);
 512 }
 513
 514 void transport_verify_remote_names(int nr_heads, const char **heads)
 515 {
 516         int i;
 517
 518         for (i = 0; i < nr_heads; i++) {
 519                 const char *local = heads[i];
 520                 const char *remote = strrchr(heads[i], ':');
 521
 522                 if (*local == '+')
 523                         local++;
 524
 525                 /* A matching refspec is okay.  */
 526                 if (remote == local && remote[1] == '\0')
 527                         continue;
 528
 529                 remote = remote ? (remote + 1) : local;
 530                 if (check_refname_format(remote,
 531                                 REFNAME_ALLOW_ONELEVEL|REFNAME_REFSPEC_PATTERN))
 532                         die("remote part of refspec is not a valid name in %s",
 533                                 heads[i]);
 534         }
 535 }
 536
 537 static int git_transport_push(struct transport *transport, struct ref *remote_refs, int flags)
 538 {
 539         struct git_transport_data *data = transport->data;
 540         struct send_pack_args args;
 541         int ret;
 542
 543         if (!data->got_remote_heads) {
 544                 struct ref *tmp_refs;
 545                 connect_setup(transport, 1);
 546
 547                 get_remote_heads(data->fd[0], NULL, 0, &tmp_refs, REF_NORMAL,
 548                                  NULL, &data->shallow);
 549                 data->got_remote_heads = 1;
 550         }
 551
 552         memset(&args, 0, sizeof(args));
 553         args.send_mirror = !!(flags & TRANSPORT_PUSH_MIRROR);
 554         args.force_update = !!(flags & TRANSPORT_PUSH_FORCE);
 555         args.use_thin_pack = data->options.thin;
 556         args.verbose = (transport->verbose > 0);
 557         args.quiet = (transport->verbose < 0);
 558         args.progress = transport->progress;
 559         args.dry_run = !!(flags & TRANSPORT_PUSH_DRY_RUN);
 560         args.porcelain = !!(flags & TRANSPORT_PUSH_PORCELAIN);
 561         args.atomic = !!(flags & TRANSPORT_PUSH_ATOMIC);
 562         args.push_options = transport->push_options;
 563         args.url = transport->url;
 564
 565         if (flags & TRANSPORT_PUSH_CERT_ALWAYS)
 566                 args.push_cert = SEND_PACK_PUSH_CERT_ALWAYS;
 567         else if (flags & TRANSPORT_PUSH_CERT_IF_ASKED)
 568                 args.push_cert = SEND_PACK_PUSH_CERT_IF_ASKED;
 569         else
 570                 args.push_cert = SEND_PACK_PUSH_CERT_NEVER;
 571
 572         ret = send_pack(&args, data->fd, data->conn, remote_refs,
 573                         &data->extra_have);
 574
 575         close(data->fd[1]);
 576         close(data->fd[0]);
 577         ret |= finish_connect(data->conn);
 578         data->conn = NULL;
 579         data->got_remote_heads = 0;
 580
 581         return ret;
 582 }
 583
 584 static int connect_git(struct transport *transport, const char *name,
 585                        const char *executable, int fd[2])
 586 {
 587         struct git_transport_data *data = transport->data;
 588         data->conn = git_connect(data->fd, transport->url,
 589                                  executable, 0);
 590         fd[0] = data->fd[0];
 591         fd[1] = data->fd[1];
 592         return 0;
 593 }
 594
 595 static int disconnect_git(struct transport *transport)
 596 {
 597         struct git_transport_data *data = transport->data;
 598         if (data->conn) {
 599                 if (data->got_remote_heads)
 600                         packet_flush(data->fd[1]);
 601                 close(data->fd[0]);
 602                 close(data->fd[1]);
 603                 finish_connect(data->conn);
 604         }
 605
 606         free(data);
 607         return 0;
 608 }
 609
 610 void transport_take_over(struct transport *transport,
 611                          struct child_process *child)
 612 {
 613         struct git_transport_data *data;
 614
 615         if (!transport->smart_options)
 616                 die("BUG: taking over transport requires non-NULL "
 617                     "smart_options field.");
 618
 619         data = xcalloc(1, sizeof(*data));
 620         data->options = *transport->smart_options;
 621         data->conn = child;
 622         data->fd[0] = data->conn->out;
 623         data->fd[1] = data->conn->in;
 624         data->got_remote_heads = 0;
 625         transport->data = data;
 626
 627         transport->set_option = NULL;
 628         transport->get_refs_list = get_refs_via_connect;
 629         transport->fetch = fetch_refs_via_pack;
 630         transport->push = NULL;
 631         transport->push_refs = git_transport_push;
 632         transport->disconnect = disconnect_git;
 633         transport->smart_options = &(data->options);
 634
 635         transport->cannot_reuse = 1;
 636 }
 637
 638 static int is_file(const char *url)
 639 {
 640         struct stat buf;
 641         if (stat(url, &buf))
 642                 return 0;
 643         return S_ISREG(buf.st_mode);
 644 }
 645
 646 static int external_specification_len(const char *url)
 647 {
 648         return strchr(url, ':') - url;
 649 }
 650
 651 static const struct string_list *protocol_whitelist(void)
 652 {
 653         static int enabled = -1;
 654         static struct string_list allowed = STRING_LIST_INIT_DUP;
 655
 656         if (enabled < 0) {
 657                 const char *v = getenv("GIT_ALLOW_PROTOCOL");
 658                 if (v) {
 659                         string_list_split(&allowed, v, ':', -1);
 660                         string_list_sort(&allowed);
 661                         enabled = 1;
 662                 } else {
 663                         enabled = 0;
 664                 }
 665         }
 666
 667         return enabled ? &allowed : NULL;
 668 }
 669
 670 enum protocol_allow_config {
 671         PROTOCOL_ALLOW_NEVER = 0,
 672         PROTOCOL_ALLOW_USER_ONLY,
 673         PROTOCOL_ALLOW_ALWAYS
 674 };
 675
 676 static enum protocol_allow_config parse_protocol_config(const char *key,
 677                                                         const char *value)
 678 {
 679         if (!strcasecmp(value, "always"))
 680                 return PROTOCOL_ALLOW_ALWAYS;
 681         else if (!strcasecmp(value, "never"))
 682                 return PROTOCOL_ALLOW_NEVER;
 683         else if (!strcasecmp(value, "user"))
 684                 return PROTOCOL_ALLOW_USER_ONLY;
 685
 686         die("unknown value for config '%s': %s", key, value);
 687 }
 688
 689 static enum protocol_allow_config get_protocol_config(const char *type)
 690 {
 691         char *key = xstrfmt("protocol.%s.allow", type);
 692         char *value;
 693
 694         /* first check the per-protocol config */
 695         if (!git_config_get_string(key, &value)) {
 696                 enum protocol_allow_config ret =
 697                         parse_protocol_config(key, value);
 698                 free(key);
 699                 free(value);
 700                 return ret;
 701         }
 702         free(key);
 703
 704         /* if defined, fallback to user-defined default for unknown protocols */
 705         if (!git_config_get_string("protocol.allow", &value)) {
 706                 enum protocol_allow_config ret =
 707                         parse_protocol_config("protocol.allow", value);
 708                 free(value);
 709                 return ret;
 710         }
 711
 712         /* fallback to built-in defaults */
 713         /* known safe */
 714         if (!strcmp(type, "http") ||
 715             !strcmp(type, "https") ||
 716             !strcmp(type, "git") ||
 717             !strcmp(type, "ssh") ||
 718             !strcmp(type, "file"))
 719                 return PROTOCOL_ALLOW_ALWAYS;
 720
 721         /* known scary; err on the side of caution */
 722         if (!strcmp(type, "ext"))
 723                 return PROTOCOL_ALLOW_NEVER;
 724
 725         /* unknown; by default let them be used only directly by the user */
 726         return PROTOCOL_ALLOW_USER_ONLY;
 727 }
 728
 729 int is_transport_allowed(const char *type, int from_user)
 730 {
 731         const struct string_list *whitelist = protocol_whitelist();
 732         if (whitelist)
 733                 return string_list_has_string(whitelist, type);
 734
 735         switch (get_protocol_config(type)) {
 736         case PROTOCOL_ALLOW_ALWAYS:
 737                 return 1;
 738         case PROTOCOL_ALLOW_NEVER:
 739                 return 0;
 740         case PROTOCOL_ALLOW_USER_ONLY:
 741                 if (from_user < 0)
 742                         from_user = git_env_bool("GIT_PROTOCOL_FROM_USER", 1);
 743                 return from_user;
 744         }
 745
 746         die("BUG: invalid protocol_allow_config type");
 747 }
 748
 749 void transport_check_allowed(const char *type)
 750 {
 751         if (!is_transport_allowed(type, -1))
 752                 die("transport '%s' not allowed", type);
 753 }
 754
 755 struct transport *transport_get(struct remote *remote, const char *url)
 756 {
 757         const char *helper;
 758         struct transport *ret = xcalloc(1, sizeof(*ret));
 759
 760         ret->progress = isatty(2);
 761
 762         if (!remote)
 763                 die("No remote provided to transport_get()");
 764
 765         ret->got_remote_refs = 0;
 766         ret->remote = remote;
 767         helper = remote->foreign_vcs;
 768
 769         if (!url && remote->url)
 770                 url = remote->url[0];
 771         ret->url = url;
 772
 773         /* maybe it is a foreign URL? */
 774         if (url) {
 775                 const char *p = url;
 776
 777                 while (is_urlschemechar(p == url, *p))
 778                         p++;
 779                 if (starts_with(p, "::"))
 780                         helper = xstrndup(url, p - url);
 781         }
 782
 783         if (helper) {
 784                 transport_helper_init(ret, helper);
 785         } else if (starts_with(url, "rsync:")) {
 786                 die("git-over-rsync is no longer supported");
 787         } else if (url_is_local_not_ssh(url) && is_file(url) && is_bundle(url, 1)) {
 788                 struct bundle_transport_data *data = xcalloc(1, sizeof(*data));
 789                 transport_check_allowed("file");
 790                 ret->data = data;
 791                 ret->get_refs_list = get_refs_from_bundle;
 792                 ret->fetch = fetch_refs_from_bundle;
 793                 ret->disconnect = close_bundle;
 794                 ret->smart_options = NULL;
 795         } else if (!is_url(url)
 796                 || starts_with(url, "file://")
 797                 || starts_with(url, "git://")
 798                 || starts_with(url, "ssh://")
 799                 || starts_with(url, "git+ssh://") /* deprecated - do not use */
 800                 || starts_with(url, "ssh+git://") /* deprecated - do not use */
 801                 ) {
 802                 /*
 803                  * These are builtin smart transports; "allowed" transports
 804                  * will be checked individually in git_connect.
 805                  */
 806                 struct git_transport_data *data = xcalloc(1, sizeof(*data));
 807                 ret->data = data;
 808                 ret->set_option = NULL;
 809                 ret->get_refs_list = get_refs_via_connect;
 810                 ret->fetch = fetch_refs_via_pack;
 811                 ret->push_refs = git_transport_push;
 812                 ret->connect = connect_git;
 813                 ret->disconnect = disconnect_git;
 814                 ret->smart_options = &(data->options);
 815
 816                 data->conn = NULL;
 817                 data->got_remote_heads = 0;
 818         } else {
 819                 /* Unknown protocol in URL. Pass to external handler. */
 820                 int len = external_specification_len(url);
 821                 char *handler = xmemdupz(url, len);
 822                 transport_helper_init(ret, handler);
 823         }
 824
 825         if (ret->smart_options) {
 826                 ret->smart_options->thin = 1;
 827                 ret->smart_options->uploadpack = "git-upload-pack";
 828                 if (remote->uploadpack)
 829                         ret->smart_options->uploadpack = remote->uploadpack;
 830                 ret->smart_options->receivepack = "git-receive-pack";
 831                 if (remote->receivepack)
 832                         ret->smart_options->receivepack = remote->receivepack;
 833         }
 834
 835         return ret;
 836 }
 837
 838 int transport_set_option(struct transport *transport,
 839                          const char *name, const char *value)
 840 {
 841         int git_reports = 1, protocol_reports = 1;
 842
 843         if (transport->smart_options)
 844                 git_reports = set_git_option(transport->smart_options,
 845                                              name, value);
 846
 847         if (transport->set_option)
 848                 protocol_reports = transport->set_option(transport, name,
 849                                                         value);
 850
 851         /* If either report is 0, report 0 (success). */
 852         if (!git_reports || !protocol_reports)
 853                 return 0;
 854         /* If either reports -1 (invalid value), report -1. */
 855         if ((git_reports == -1) || (protocol_reports == -1))
 856                 return -1;
 857         /* Otherwise if both report unknown, report unknown. */
 858         return 1;
 859 }
 860
 861 void transport_set_verbosity(struct transport *transport, int verbosity,
 862         int force_progress)
 863 {
 864         if (verbosity >= 1)
 865                 transport->verbose = verbosity <= 3 ? verbosity : 3;
 866         if (verbosity < 0)
 867                 transport->verbose = -1;
 868
 869         /**
 870          * Rules used to determine whether to report progress (processing aborts
 871          * when a rule is satisfied):
 872          *
 873          *   . Report progress, if force_progress is 1 (ie. --progress).
 874          *   . Don't report progress, if force_progress is 0 (ie. --no-progress).
 875          *   . Don't report progress, if verbosity < 0 (ie. -q/--quiet ).
 876          *   . Report progress if isatty(2) is 1.
 877          **/
 878         if (force_progress >= 0)
 879                 transport->progress = !!force_progress;
 880         else
 881                 transport->progress = verbosity >= 0 && isatty(2);
 882 }
 883
 884 static void die_with_unpushed_submodules(struct string_list *needs_pushing)
 885 {
 886         int i;
 887
 888         fprintf(stderr, _("The following submodule paths contain changes that can\n"
 889                         "not be found on any remote:\n"));
 890         for (i = 0; i < needs_pushing->nr; i++)
 891                 fprintf(stderr, "  %s\n", needs_pushing->items[i].string);
 892         fprintf(stderr, _("\nPlease try\n\n"
 893                           "     git push --recurse-submodules=on-demand\n\n"
 894                           "or cd to the path and use\n\n"
 895                           "     git push\n\n"
 896                           "to push them to a remote.\n\n"));
 897
 898         string_list_clear(needs_pushing, 0);
 899
 900         die(_("Aborting."));
 901 }
 902
 903 static int run_pre_push_hook(struct transport *transport,
 904                              struct ref *remote_refs)
 905 {
 906         int ret = 0, x;
 907         struct ref *r;
 908         struct child_process proc = CHILD_PROCESS_INIT;
 909         struct strbuf buf;
 910         const char *argv[4];
 911
 912         if (!(argv[0] = find_hook("pre-push")))
 913                 return 0;
 914
 915         argv[1] = transport->remote->name;
 916         argv[2] = transport->url;
 917         argv[3] = NULL;
 918
 919         proc.argv = argv;
 920         proc.in = -1;
 921
 922         if (start_command(&proc)) {
 923                 finish_command(&proc);
 924                 return -1;
 925         }
 926
 927         sigchain_push(SIGPIPE, SIG_IGN);
 928
 929         strbuf_init(&buf, 256);
 930
 931         for (r = remote_refs; r; r = r->next) {
 932                 if (!r->peer_ref) continue;
 933                 if (r->status == REF_STATUS_REJECT_NONFASTFORWARD) continue;
 934                 if (r->status == REF_STATUS_REJECT_STALE) continue;
 935                 if (r->status == REF_STATUS_UPTODATE) continue;
 936
 937                 strbuf_reset(&buf);
 938                 strbuf_addf( &buf, "%s %s %s %s\n",
 939                          r->peer_ref->name, oid_to_hex(&r->new_oid),
 940                          r->name, oid_to_hex(&r->old_oid));
 941
 942                 if (write_in_full(proc.in, buf.buf, buf.len) < 0) {
 943                         /* We do not mind if a hook does not read all refs. */
 944                         if (errno != EPIPE)
 945                                 ret = -1;
 946                         break;
 947                 }
 948         }
 949
 950         strbuf_release(&buf);
 951
 952         x = close(proc.in);
 953         if (!ret)
 954                 ret = x;
 955
 956         sigchain_pop(SIGPIPE);
 957
 958         x = finish_command(&proc);
 959         if (!ret)
 960                 ret = x;
 961
 962         return ret;
 963 }
 964
 965 int transport_push(struct transport *transport,
 966                    int refspec_nr, const char **refspec, int flags,
 967                    unsigned int *reject_reasons)
 968 {
 969         *reject_reasons = 0;
 970         transport_verify_remote_names(refspec_nr, refspec);
 971
 972         if (transport->push) {
 973                 /* Maybe FIXME. But no important transport uses this case. */
 974                 if (flags & TRANSPORT_PUSH_SET_UPSTREAM)
 975                         die("This transport does not support using --set-upstream");
 976
 977                 return transport->push(transport, refspec_nr, refspec, flags);
 978         } else if (transport->push_refs) {
 979                 struct ref *remote_refs;
 980                 struct ref *local_refs = get_local_heads();
 981                 int match_flags = MATCH_REFS_NONE;
 982                 int verbose = (transport->verbose > 0);
 983                 int quiet = (transport->verbose < 0);
 984                 int porcelain = flags & TRANSPORT_PUSH_PORCELAIN;
 985                 int pretend = flags & TRANSPORT_PUSH_DRY_RUN;
 986                 int push_ret, ret, err;
 987
 988                 if (check_push_refs(local_refs, refspec_nr, refspec) < 0)
 989                         return -1;
 990
 991                 remote_refs = transport->get_refs_list(transport, 1);
 992
 993                 if (flags & TRANSPORT_PUSH_ALL)
 994                         match_flags |= MATCH_REFS_ALL;
 995                 if (flags & TRANSPORT_PUSH_MIRROR)
 996                         match_flags |= MATCH_REFS_MIRROR;
 997                 if (flags & TRANSPORT_PUSH_PRUNE)
 998                         match_flags |= MATCH_REFS_PRUNE;
 999                 if (flags & TRANSPORT_PUSH_FOLLOW_TAGS)
1000                         match_flags |= MATCH_REFS_FOLLOW_TAGS;
1001
1002                 if (match_push_refs(local_refs, &remote_refs,
1003                                     refspec_nr, refspec, match_flags)) {
1004                         return -1;
1005                 }
1006
1007                 if (transport->smart_options &&
1008                     transport->smart_options->cas &&
1009                     !is_empty_cas(transport->smart_options->cas))
1010                         apply_push_cas(transport->smart_options->cas,
1011                                        transport->remote, remote_refs);
1012
1013                 set_ref_status_for_push(remote_refs,
1014                         flags & TRANSPORT_PUSH_MIRROR,
1015                         flags & TRANSPORT_PUSH_FORCE);
1016
1017                 if (!(flags & TRANSPORT_PUSH_NO_HOOK))
1018                         if (run_pre_push_hook(transport, remote_refs))
1019                                 return -1;
1020
1021                 if ((flags & (TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND |
1022                               TRANSPORT_RECURSE_SUBMODULES_ONLY)) &&
1023                     !is_bare_repository()) {
1024                         struct ref *ref = remote_refs;
1025                         struct oid_array commits = OID_ARRAY_INIT;
1026
1027                         for (; ref; ref = ref->next)
1028                                 if (!is_null_oid(&ref->new_oid))
1029                                         oid_array_append(&commits,
1030                                                           &ref->new_oid);
1031
1032                         if (!push_unpushed_submodules(&commits,
1033                                                       transport->remote,
1034                                                       refspec, refspec_nr,
1035                                                       transport->push_options,
1036                                                       pretend)) {
1037                                 oid_array_clear(&commits);
1038                                 die("Failed to push all needed submodules!");
1039                         }
1040                         oid_array_clear(&commits);
1041                 }
1042
1043                 if (((flags & TRANSPORT_RECURSE_SUBMODULES_CHECK) ||
1044                      ((flags & (TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND |
1045                                 TRANSPORT_RECURSE_SUBMODULES_ONLY)) &&
1046                       !pretend)) && !is_bare_repository()) {
1047                         struct ref *ref = remote_refs;
1048                         struct string_list needs_pushing = STRING_LIST_INIT_DUP;
1049                         struct oid_array commits = OID_ARRAY_INIT;
1050
1051                         for (; ref; ref = ref->next)
1052                                 if (!is_null_oid(&ref->new_oid))
1053                                         oid_array_append(&commits,
1054                                                           &ref->new_oid);
1055
1056                         if (find_unpushed_submodules(&commits, transport->remote->name,
1057                                                 &needs_pushing)) {
1058                                 oid_array_clear(&commits);
1059                                 die_with_unpushed_submodules(&needs_pushing);
1060                         }
1061                         string_list_clear(&needs_pushing, 0);
1062                         oid_array_clear(&commits);
1063                 }
1064
1065                 if (!(flags & TRANSPORT_RECURSE_SUBMODULES_ONLY))
1066                         push_ret = transport->push_refs(transport, remote_refs, flags);
1067                 else
1068                         push_ret = 0;
1069                 err = push_had_errors(remote_refs);
1070                 ret = push_ret | err;
1071
1072                 if (!quiet || err)
1073                         transport_print_push_status(transport->url, remote_refs,
1074                                         verbose | porcelain, porcelain,
1075                                         reject_reasons);
1076
1077                 if (flags & TRANSPORT_PUSH_SET_UPSTREAM)
1078                         set_upstreams(transport, remote_refs, pretend);
1079
1080                 if (!(flags & (TRANSPORT_PUSH_DRY_RUN |
1081                                TRANSPORT_RECURSE_SUBMODULES_ONLY))) {
1082                         struct ref *ref;
1083                         for (ref = remote_refs; ref; ref = ref->next)
1084                                 transport_update_tracking_ref(transport->remote, ref, verbose);
1085                 }
1086
1087                 if (porcelain && !push_ret)
1088                         puts("Done");
1089                 else if (!quiet && !ret && !transport_refs_pushed(remote_refs))
1090                         fprintf(stderr, "Everything up-to-date\n");
1091
1092                 return ret;
1093         }
1094         return 1;
1095 }
1096
1097 const struct ref *transport_get_remote_refs(struct transport *transport)
1098 {
1099         if (!transport->got_remote_refs) {
1100                 transport->remote_refs = transport->get_refs_list(transport, 0);
1101                 transport->got_remote_refs = 1;
1102         }
1103
1104         return transport->remote_refs;
1105 }
1106
1107 int transport_fetch_refs(struct transport *transport, struct ref *refs)
1108 {
1109         int rc;
1110         int nr_heads = 0, nr_alloc = 0, nr_refs = 0;
1111         struct ref **heads = NULL;
1112         struct ref *rm;
1113
1114         for (rm = refs; rm; rm = rm->next) {
1115                 nr_refs++;
1116                 if (rm->peer_ref &&
1117                     !is_null_oid(&rm->old_oid) &&
1118                     !oidcmp(&rm->peer_ref->old_oid, &rm->old_oid))
1119                         continue;
1120                 ALLOC_GROW(heads, nr_heads + 1, nr_alloc);
1121                 heads[nr_heads++] = rm;
1122         }
1123
1124         if (!nr_heads) {
1125                 /*
1126                  * When deepening of a shallow repository is requested,
1127                  * then local and remote refs are likely to still be equal.
1128                  * Just feed them all to the fetch method in that case.
1129                  * This condition shouldn't be met in a non-deepening fetch
1130                  * (see builtin/fetch.c:quickfetch()).
1131                  */
1132                 ALLOC_ARRAY(heads, nr_refs);
1133                 for (rm = refs; rm; rm = rm->next)
1134                         heads[nr_heads++] = rm;
1135         }
1136
1137         rc = transport->fetch(transport, nr_heads, heads);
1138
1139         free(heads);
1140         return rc;
1141 }
1142
1143 void transport_unlock_pack(struct transport *transport)
1144 {
1145         if (transport->pack_lockfile) {
1146                 unlink_or_warn(transport->pack_lockfile);
1147                 FREE_AND_NULL(transport->pack_lockfile);
1148         }
1149 }
1150
1151 int transport_connect(struct transport *transport, const char *name,
1152                       const char *exec, int fd[2])
1153 {
1154         if (transport->connect)
1155                 return transport->connect(transport, name, exec, fd);
1156         else
1157                 die("Operation not supported by protocol");
1158 }
1159
1160 int transport_disconnect(struct transport *transport)
1161 {
1162         int ret = 0;
1163         if (transport->disconnect)
1164                 ret = transport->disconnect(transport);
1165         free(transport);
1166         return ret;
1167 }
1168
1169 /*
1170  * Strip username (and password) from a URL and return
1171  * it in a newly allocated string.
1172  */
1173 char *transport_anonymize_url(const char *url)
1174 {
1175         char *scheme_prefix, *anon_part;
1176         size_t anon_len, prefix_len = 0;
1177
1178         anon_part = strchr(url, '@');
1179         if (url_is_local_not_ssh(url) || !anon_part)
1180                 goto literal_copy;
1181
1182         anon_len = strlen(++anon_part);
1183         scheme_prefix = strstr(url, "://");
1184         if (!scheme_prefix) {
1185                 if (!strchr(anon_part, ':'))
1186                         /* cannot be "me@there:/path/name" */
1187                         goto literal_copy;
1188         } else {
1189                 const char *cp;
1190                 /* make sure scheme is reasonable */
1191                 for (cp = url; cp < scheme_prefix; cp++) {
1192                         switch (*cp) {
1193                                 /* RFC 1738 2.1 */
1194                         case '+': case '.': case '-':
1195                                 break; /* ok */
1196                         default:
1197                                 if (isalnum(*cp))
1198                                         break;
1199                                 /* it isn't */
1200                                 goto literal_copy;
1201                         }
1202                 }
1203                 /* @ past the first slash does not count */
1204                 cp = strchr(scheme_prefix + 3, '/');
1205                 if (cp && cp < anon_part)
1206                         goto literal_copy;
1207                 prefix_len = scheme_prefix - url + 3;
1208         }
1209         return xstrfmt("%.*s%.*s", (int)prefix_len, url,
1210                        (int)anon_len, anon_part);
1211 literal_copy:
1212         return xstrdup(url);
1213 }
1214
1215 static void read_alternate_refs(const char *path,
1216                                 alternate_ref_fn *cb,
1217                                 void *data)
1218 {
1219         struct child_process cmd = CHILD_PROCESS_INIT;
1220         struct strbuf line = STRBUF_INIT;
1221         FILE *fh;
1222
1223         cmd.git_cmd = 1;
1224         argv_array_pushf(&cmd.args, "--git-dir=%s", path);
1225         argv_array_push(&cmd.args, "for-each-ref");
1226         argv_array_push(&cmd.args, "--format=%(objectname) %(refname)");
1227         cmd.env = local_repo_env;
1228         cmd.out = -1;
1229
1230         if (start_command(&cmd))
1231                 return;
1232
1233         fh = xfdopen(cmd.out, "r");
1234         while (strbuf_getline_lf(&line, fh) != EOF) {
1235                 struct object_id oid;
1236
1237                 if (get_oid_hex(line.buf, &oid) ||
1238                     line.buf[GIT_SHA1_HEXSZ] != ' ') {
1239                         warning("invalid line while parsing alternate refs: %s",
1240                                 line.buf);
1241                         break;
1242                 }
1243
1244                 cb(line.buf + GIT_SHA1_HEXSZ + 1, &oid, data);
1245         }
1246
1247         fclose(fh);
1248         finish_command(&cmd);
1249 }
1250
1251 struct alternate_refs_data {
1252         alternate_ref_fn *fn;
1253         void *data;
1254 };
1255
1256 static int refs_from_alternate_cb(struct alternate_object_database *e,
1257                                   void *data)
1258 {
1259         struct strbuf path = STRBUF_INIT;
1260         size_t base_len;
1261         struct alternate_refs_data *cb = data;
1262
1263         if (!strbuf_realpath(&path, e->path, 0))
1264                 goto out;
1265         if (!strbuf_strip_suffix(&path, "/objects"))
1266                 goto out;
1267         base_len = path.len;
1268
1269         /* Is this a git repository with refs? */
1270         strbuf_addstr(&path, "/refs");
1271         if (!is_directory(path.buf))
1272                 goto out;
1273         strbuf_setlen(&path, base_len);
1274
1275         read_alternate_refs(path.buf, cb->fn, cb->data);
1276
1277 out:
1278         strbuf_release(&path);
1279         return 0;
1280 }
1281
1282 void for_each_alternate_ref(alternate_ref_fn fn, void *data)
1283 {
1284         struct alternate_refs_data cb;
1285         cb.fn = fn;
1286         cb.data = data;
1287         foreach_alt_odb(refs_from_alternate_cb, &cb);
1288 }