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(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_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         struct object_id head_oid;
 475         char *head;
 476         int summary_width = transport_summary_width(refs);
 477
 478         head = resolve_refdup("HEAD", RESOLVE_REF_READING, head_oid.hash, 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 enum protocol_allow_config {
 672         PROTOCOL_ALLOW_NEVER = 0,
 673         PROTOCOL_ALLOW_USER_ONLY,
 674         PROTOCOL_ALLOW_ALWAYS
 675 };
 676
 677 static enum protocol_allow_config parse_protocol_config(const char *key,
 678                                                         const char *value)
 679 {
 680         if (!strcasecmp(value, "always"))
 681                 return PROTOCOL_ALLOW_ALWAYS;
 682         else if (!strcasecmp(value, "never"))
 683                 return PROTOCOL_ALLOW_NEVER;
 684         else if (!strcasecmp(value, "user"))
 685                 return PROTOCOL_ALLOW_USER_ONLY;
 686
 687         die("unknown value for config '%s': %s", key, value);
 688 }
 689
 690 static enum protocol_allow_config get_protocol_config(const char *type)
 691 {
 692         char *key = xstrfmt("protocol.%s.allow", type);
 693         char *value;
 694
 695         /* first check the per-protocol config */
 696         if (!git_config_get_string(key, &value)) {
 697                 enum protocol_allow_config ret =
 698                         parse_protocol_config(key, value);
 699                 free(key);
 700                 free(value);
 701                 return ret;
 702         }
 703         free(key);
 704
 705         /* if defined, fallback to user-defined default for unknown protocols */
 706         if (!git_config_get_string("protocol.allow", &value)) {
 707                 enum protocol_allow_config ret =
 708                         parse_protocol_config("protocol.allow", value);
 709                 free(value);
 710                 return ret;
 711         }
 712
 713         /* fallback to built-in defaults */
 714         /* known safe */
 715         if (!strcmp(type, "http") ||
 716             !strcmp(type, "https") ||
 717             !strcmp(type, "git") ||
 718             !strcmp(type, "ssh") ||
 719             !strcmp(type, "file"))
 720                 return PROTOCOL_ALLOW_ALWAYS;
 721
 722         /* known scary; err on the side of caution */
 723         if (!strcmp(type, "ext"))
 724                 return PROTOCOL_ALLOW_NEVER;
 725
 726         /* unknown; by default let them be used only directly by the user */
 727         return PROTOCOL_ALLOW_USER_ONLY;
 728 }
 729
 730 int is_transport_allowed(const char *type, int from_user)
 731 {
 732         const struct string_list *whitelist = protocol_whitelist();
 733         if (whitelist)
 734                 return string_list_has_string(whitelist, type);
 735
 736         switch (get_protocol_config(type)) {
 737         case PROTOCOL_ALLOW_ALWAYS:
 738                 return 1;
 739         case PROTOCOL_ALLOW_NEVER:
 740                 return 0;
 741         case PROTOCOL_ALLOW_USER_ONLY:
 742                 if (from_user < 0)
 743                         from_user = git_env_bool("GIT_PROTOCOL_FROM_USER", 1);
 744                 return from_user;
 745         }
 746
 747         die("BUG: invalid protocol_allow_config type");
 748 }
 749
 750 void transport_check_allowed(const char *type)
 751 {
 752         if (!is_transport_allowed(type, -1))
 753                 die("transport '%s' not allowed", type);
 754 }
 755
 756 struct transport *transport_get(struct remote *remote, const char *url)
 757 {
 758         const char *helper;
 759         struct transport *ret = xcalloc(1, sizeof(*ret));
 760
 761         ret->progress = isatty(2);
 762
 763         if (!remote)
 764                 die("No remote provided to transport_get()");
 765
 766         ret->got_remote_refs = 0;
 767         ret->remote = remote;
 768         helper = remote->foreign_vcs;
 769
 770         if (!url && remote->url)
 771                 url = remote->url[0];
 772         ret->url = url;
 773
 774         /* maybe it is a foreign URL? */
 775         if (url) {
 776                 const char *p = url;
 777
 778                 while (is_urlschemechar(p == url, *p))
 779                         p++;
 780                 if (starts_with(p, "::"))
 781                         helper = xstrndup(url, p - url);
 782         }
 783
 784         if (helper) {
 785                 transport_helper_init(ret, helper);
 786         } else if (starts_with(url, "rsync:")) {
 787                 die("git-over-rsync is no longer supported");
 788         } else if (url_is_local_not_ssh(url) && is_file(url) && is_bundle(url, 1)) {
 789                 struct bundle_transport_data *data = xcalloc(1, sizeof(*data));
 790                 transport_check_allowed("file");
 791                 ret->data = data;
 792                 ret->get_refs_list = get_refs_from_bundle;
 793                 ret->fetch = fetch_refs_from_bundle;
 794                 ret->disconnect = close_bundle;
 795                 ret->smart_options = NULL;
 796         } else if (!is_url(url)
 797                 || starts_with(url, "file://")
 798                 || starts_with(url, "git://")
 799                 || starts_with(url, "ssh://")
 800                 || starts_with(url, "git+ssh://") /* deprecated - do not use */
 801                 || starts_with(url, "ssh+git://") /* deprecated - do not use */
 802                 ) {
 803                 /*
 804                  * These are builtin smart transports; "allowed" transports
 805                  * will be checked individually in git_connect.
 806                  */
 807                 struct git_transport_data *data = xcalloc(1, sizeof(*data));
 808                 ret->data = data;
 809                 ret->set_option = NULL;
 810                 ret->get_refs_list = get_refs_via_connect;
 811                 ret->fetch = fetch_refs_via_pack;
 812                 ret->push_refs = git_transport_push;
 813                 ret->connect = connect_git;
 814                 ret->disconnect = disconnect_git;
 815                 ret->smart_options = &(data->options);
 816
 817                 data->conn = NULL;
 818                 data->got_remote_heads = 0;
 819         } else {
 820                 /* Unknown protocol in URL. Pass to external handler. */
 821                 int len = external_specification_len(url);
 822                 char *handler = xmemdupz(url, len);
 823                 transport_helper_init(ret, handler);
 824         }
 825
 826         if (ret->smart_options) {
 827                 ret->smart_options->thin = 1;
 828                 ret->smart_options->uploadpack = "git-upload-pack";
 829                 if (remote->uploadpack)
 830                         ret->smart_options->uploadpack = remote->uploadpack;
 831                 ret->smart_options->receivepack = "git-receive-pack";
 832                 if (remote->receivepack)
 833                         ret->smart_options->receivepack = remote->receivepack;
 834         }
 835
 836         return ret;
 837 }
 838
 839 int transport_set_option(struct transport *transport,
 840                          const char *name, const char *value)
 841 {
 842         int git_reports = 1, protocol_reports = 1;
 843
 844         if (transport->smart_options)
 845                 git_reports = set_git_option(transport->smart_options,
 846                                              name, value);
 847
 848         if (transport->set_option)
 849                 protocol_reports = transport->set_option(transport, name,
 850                                                         value);
 851
 852         /* If either report is 0, report 0 (success). */
 853         if (!git_reports || !protocol_reports)
 854                 return 0;
 855         /* If either reports -1 (invalid value), report -1. */
 856         if ((git_reports == -1) || (protocol_reports == -1))
 857                 return -1;
 858         /* Otherwise if both report unknown, report unknown. */
 859         return 1;
 860 }
 861
 862 void transport_set_verbosity(struct transport *transport, int verbosity,
 863         int force_progress)
 864 {
 865         if (verbosity >= 1)
 866                 transport->verbose = verbosity <= 3 ? verbosity : 3;
 867         if (verbosity < 0)
 868                 transport->verbose = -1;
 869
 870         /**
 871          * Rules used to determine whether to report progress (processing aborts
 872          * when a rule is satisfied):
 873          *
 874          *   . Report progress, if force_progress is 1 (ie. --progress).
 875          *   . Don't report progress, if force_progress is 0 (ie. --no-progress).
 876          *   . Don't report progress, if verbosity < 0 (ie. -q/--quiet ).
 877          *   . Report progress if isatty(2) is 1.
 878          **/
 879         if (force_progress >= 0)
 880                 transport->progress = !!force_progress;
 881         else
 882                 transport->progress = verbosity >= 0 && isatty(2);
 883 }
 884
 885 static void die_with_unpushed_submodules(struct string_list *needs_pushing)
 886 {
 887         int i;
 888
 889         fprintf(stderr, _("The following submodule paths contain changes that can\n"
 890                         "not be found on any remote:\n"));
 891         for (i = 0; i < needs_pushing->nr; i++)
 892                 fprintf(stderr, "  %s\n", needs_pushing->items[i].string);
 893         fprintf(stderr, _("\nPlease try\n\n"
 894                           "     git push --recurse-submodules=on-demand\n\n"
 895                           "or cd to the path and use\n\n"
 896                           "     git push\n\n"
 897                           "to push them to a remote.\n\n"));
 898
 899         string_list_clear(needs_pushing, 0);
 900
 901         die(_("Aborting."));
 902 }
 903
 904 static int run_pre_push_hook(struct transport *transport,
 905                              struct ref *remote_refs)
 906 {
 907         int ret = 0, x;
 908         struct ref *r;
 909         struct child_process proc = CHILD_PROCESS_INIT;
 910         struct strbuf buf;
 911         const char *argv[4];
 912
 913         if (!(argv[0] = find_hook("pre-push")))
 914                 return 0;
 915
 916         argv[1] = transport->remote->name;
 917         argv[2] = transport->url;
 918         argv[3] = NULL;
 919
 920         proc.argv = argv;
 921         proc.in = -1;
 922
 923         if (start_command(&proc)) {
 924                 finish_command(&proc);
 925                 return -1;
 926         }
 927
 928         sigchain_push(SIGPIPE, SIG_IGN);
 929
 930         strbuf_init(&buf, 256);
 931
 932         for (r = remote_refs; r; r = r->next) {
 933                 if (!r->peer_ref) continue;
 934                 if (r->status == REF_STATUS_REJECT_NONFASTFORWARD) continue;
 935                 if (r->status == REF_STATUS_REJECT_STALE) continue;
 936                 if (r->status == REF_STATUS_UPTODATE) continue;
 937
 938                 strbuf_reset(&buf);
 939                 strbuf_addf( &buf, "%s %s %s %s\n",
 940                          r->peer_ref->name, oid_to_hex(&r->new_oid),
 941                          r->name, oid_to_hex(&r->old_oid));
 942
 943                 if (write_in_full(proc.in, buf.buf, buf.len) < 0) {
 944                         /* We do not mind if a hook does not read all refs. */
 945                         if (errno != EPIPE)
 946                                 ret = -1;
 947                         break;
 948                 }
 949         }
 950
 951         strbuf_release(&buf);
 952
 953         x = close(proc.in);
 954         if (!ret)
 955                 ret = x;
 956
 957         sigchain_pop(SIGPIPE);
 958
 959         x = finish_command(&proc);
 960         if (!ret)
 961                 ret = x;
 962
 963         return ret;
 964 }
 965
 966 int transport_push(struct transport *transport,
 967                    int refspec_nr, const char **refspec, int flags,
 968                    unsigned int *reject_reasons)
 969 {
 970         *reject_reasons = 0;
 971         transport_verify_remote_names(refspec_nr, refspec);
 972
 973         if (transport->push) {
 974                 /* Maybe FIXME. But no important transport uses this case. */
 975                 if (flags & TRANSPORT_PUSH_SET_UPSTREAM)
 976                         die("This transport does not support using --set-upstream");
 977
 978                 return transport->push(transport, refspec_nr, refspec, flags);
 979         } else if (transport->push_refs) {
 980                 struct ref *remote_refs;
 981                 struct ref *local_refs = get_local_heads();
 982                 int match_flags = MATCH_REFS_NONE;
 983                 int verbose = (transport->verbose > 0);
 984                 int quiet = (transport->verbose < 0);
 985                 int porcelain = flags & TRANSPORT_PUSH_PORCELAIN;
 986                 int pretend = flags & TRANSPORT_PUSH_DRY_RUN;
 987                 int push_ret, ret, err;
 988
 989                 if (check_push_refs(local_refs, refspec_nr, refspec) < 0)
 990                         return -1;
 991
 992                 remote_refs = transport->get_refs_list(transport, 1);
 993
 994                 if (flags & TRANSPORT_PUSH_ALL)
 995                         match_flags |= MATCH_REFS_ALL;
 996                 if (flags & TRANSPORT_PUSH_MIRROR)
 997                         match_flags |= MATCH_REFS_MIRROR;
 998                 if (flags & TRANSPORT_PUSH_PRUNE)
 999                         match_flags |= MATCH_REFS_PRUNE;
1000                 if (flags & TRANSPORT_PUSH_FOLLOW_TAGS)
1001                         match_flags |= MATCH_REFS_FOLLOW_TAGS;
1002
1003                 if (match_push_refs(local_refs, &remote_refs,
1004                                     refspec_nr, refspec, match_flags)) {
1005                         return -1;
1006                 }
1007
1008                 if (transport->smart_options &&
1009                     transport->smart_options->cas &&
1010                     !is_empty_cas(transport->smart_options->cas))
1011                         apply_push_cas(transport->smart_options->cas,
1012                                        transport->remote, remote_refs);
1013
1014                 set_ref_status_for_push(remote_refs,
1015                         flags & TRANSPORT_PUSH_MIRROR,
1016                         flags & TRANSPORT_PUSH_FORCE);
1017
1018                 if (!(flags & TRANSPORT_PUSH_NO_HOOK))
1019                         if (run_pre_push_hook(transport, remote_refs))
1020                                 return -1;
1021
1022                 if ((flags & (TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND |
1023                               TRANSPORT_RECURSE_SUBMODULES_ONLY)) &&
1024                     !is_bare_repository()) {
1025                         struct ref *ref = remote_refs;
1026                         struct sha1_array commits = SHA1_ARRAY_INIT;
1027
1028                         for (; ref; ref = ref->next)
1029                                 if (!is_null_oid(&ref->new_oid))
1030                                         sha1_array_append(&commits, ref->new_oid.hash);
1031
1032                         if (!push_unpushed_submodules(&commits,
1033                                                       transport->remote->name,
1034                                                       pretend)) {
1035                                 sha1_array_clear(&commits);
1036                                 die("Failed to push all needed submodules!");
1037                         }
1038                         sha1_array_clear(&commits);
1039                 }
1040
1041                 if (((flags & TRANSPORT_RECURSE_SUBMODULES_CHECK) ||
1042                      ((flags & (TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND |
1043                                 TRANSPORT_RECURSE_SUBMODULES_ONLY)) &&
1044                       !pretend)) && !is_bare_repository()) {
1045                         struct ref *ref = remote_refs;
1046                         struct string_list needs_pushing = STRING_LIST_INIT_DUP;
1047                         struct sha1_array commits = SHA1_ARRAY_INIT;
1048
1049                         for (; ref; ref = ref->next)
1050                                 if (!is_null_oid(&ref->new_oid))
1051                                         sha1_array_append(&commits, ref->new_oid.hash);
1052
1053                         if (find_unpushed_submodules(&commits, transport->remote->name,
1054                                                 &needs_pushing)) {
1055                                 sha1_array_clear(&commits);
1056                                 die_with_unpushed_submodules(&needs_pushing);
1057                         }
1058                         string_list_clear(&needs_pushing, 0);
1059                         sha1_array_clear(&commits);
1060                 }
1061
1062                 if (!(flags & TRANSPORT_RECURSE_SUBMODULES_ONLY))
1063                         push_ret = transport->push_refs(transport, remote_refs, flags);
1064                 else
1065                         push_ret = 0;
1066                 err = push_had_errors(remote_refs);
1067                 ret = push_ret | err;
1068
1069                 if (!quiet || err)
1070                         transport_print_push_status(transport->url, remote_refs,
1071                                         verbose | porcelain, porcelain,
1072                                         reject_reasons);
1073
1074                 if (flags & TRANSPORT_PUSH_SET_UPSTREAM)
1075                         set_upstreams(transport, remote_refs, pretend);
1076
1077                 if (!(flags & (TRANSPORT_PUSH_DRY_RUN |
1078                                TRANSPORT_RECURSE_SUBMODULES_ONLY))) {
1079                         struct ref *ref;
1080                         for (ref = remote_refs; ref; ref = ref->next)
1081                                 transport_update_tracking_ref(transport->remote, ref, verbose);
1082                 }
1083
1084                 if (porcelain && !push_ret)
1085                         puts("Done");
1086                 else if (!quiet && !ret && !transport_refs_pushed(remote_refs))
1087                         fprintf(stderr, "Everything up-to-date\n");
1088
1089                 return ret;
1090         }
1091         return 1;
1092 }
1093
1094 const struct ref *transport_get_remote_refs(struct transport *transport)
1095 {
1096         if (!transport->got_remote_refs) {
1097                 transport->remote_refs = transport->get_refs_list(transport, 0);
1098                 transport->got_remote_refs = 1;
1099         }
1100
1101         return transport->remote_refs;
1102 }
1103
1104 int transport_fetch_refs(struct transport *transport, struct ref *refs)
1105 {
1106         int rc;
1107         int nr_heads = 0, nr_alloc = 0, nr_refs = 0;
1108         struct ref **heads = NULL;
1109         struct ref *rm;
1110
1111         for (rm = refs; rm; rm = rm->next) {
1112                 nr_refs++;
1113                 if (rm->peer_ref &&
1114                     !is_null_oid(&rm->old_oid) &&
1115                     !oidcmp(&rm->peer_ref->old_oid, &rm->old_oid))
1116                         continue;
1117                 ALLOC_GROW(heads, nr_heads + 1, nr_alloc);
1118                 heads[nr_heads++] = rm;
1119         }
1120
1121         if (!nr_heads) {
1122                 /*
1123                  * When deepening of a shallow repository is requested,
1124                  * then local and remote refs are likely to still be equal.
1125                  * Just feed them all to the fetch method in that case.
1126                  * This condition shouldn't be met in a non-deepening fetch
1127                  * (see builtin/fetch.c:quickfetch()).
1128                  */
1129                 ALLOC_ARRAY(heads, nr_refs);
1130                 for (rm = refs; rm; rm = rm->next)
1131                         heads[nr_heads++] = rm;
1132         }
1133
1134         rc = transport->fetch(transport, nr_heads, heads);
1135
1136         free(heads);
1137         return rc;
1138 }
1139
1140 void transport_unlock_pack(struct transport *transport)
1141 {
1142         if (transport->pack_lockfile) {
1143                 unlink_or_warn(transport->pack_lockfile);
1144                 free(transport->pack_lockfile);
1145                 transport->pack_lockfile = NULL;
1146         }
1147 }
1148
1149 int transport_connect(struct transport *transport, const char *name,
1150                       const char *exec, int fd[2])
1151 {
1152         if (transport->connect)
1153                 return transport->connect(transport, name, exec, fd);
1154         else
1155                 die("Operation not supported by protocol");
1156 }
1157
1158 int transport_disconnect(struct transport *transport)
1159 {
1160         int ret = 0;
1161         if (transport->disconnect)
1162                 ret = transport->disconnect(transport);
1163         free(transport);
1164         return ret;
1165 }
1166
1167 /*
1168  * Strip username (and password) from a URL and return
1169  * it in a newly allocated string.
1170  */
1171 char *transport_anonymize_url(const char *url)
1172 {
1173         char *scheme_prefix, *anon_part;
1174         size_t anon_len, prefix_len = 0;
1175
1176         anon_part = strchr(url, '@');
1177         if (url_is_local_not_ssh(url) || !anon_part)
1178                 goto literal_copy;
1179
1180         anon_len = strlen(++anon_part);
1181         scheme_prefix = strstr(url, "://");
1182         if (!scheme_prefix) {
1183                 if (!strchr(anon_part, ':'))
1184                         /* cannot be "me@there:/path/name" */
1185                         goto literal_copy;
1186         } else {
1187                 const char *cp;
1188                 /* make sure scheme is reasonable */
1189                 for (cp = url; cp < scheme_prefix; cp++) {
1190                         switch (*cp) {
1191                                 /* RFC 1738 2.1 */
1192                         case '+': case '.': case '-':
1193                                 break; /* ok */
1194                         default:
1195                                 if (isalnum(*cp))
1196                                         break;
1197                                 /* it isn't */
1198                                 goto literal_copy;
1199                         }
1200                 }
1201                 /* @ past the first slash does not count */
1202                 cp = strchr(scheme_prefix + 3, '/');
1203                 if (cp && cp < anon_part)
1204                         goto literal_copy;
1205                 prefix_len = scheme_prefix - url + 3;
1206         }
1207         return xstrfmt("%.*s%.*s", (int)prefix_len, url,
1208                        (int)anon_len, anon_part);
1209 literal_copy:
1210         return xstrdup(url);
1211 }
1212
1213 static void read_alternate_refs(const char *path,
1214                                 alternate_ref_fn *cb,
1215                                 void *data)
1216 {
1217         struct child_process cmd = CHILD_PROCESS_INIT;
1218         struct strbuf line = STRBUF_INIT;
1219         FILE *fh;
1220
1221         cmd.git_cmd = 1;
1222         argv_array_pushf(&cmd.args, "--git-dir=%s", path);
1223         argv_array_push(&cmd.args, "for-each-ref");
1224         argv_array_push(&cmd.args, "--format=%(objectname) %(refname)");
1225         cmd.env = local_repo_env;
1226         cmd.out = -1;
1227
1228         if (start_command(&cmd))
1229                 return;
1230
1231         fh = xfdopen(cmd.out, "r");
1232         while (strbuf_getline_lf(&line, fh) != EOF) {
1233                 struct object_id oid;
1234
1235                 if (get_oid_hex(line.buf, &oid) ||
1236                     line.buf[GIT_SHA1_HEXSZ] != ' ') {
1237                         warning("invalid line while parsing alternate refs: %s",
1238                                 line.buf);
1239                         break;
1240                 }
1241
1242                 cb(line.buf + GIT_SHA1_HEXSZ + 1, &oid, data);
1243         }
1244
1245         fclose(fh);
1246         finish_command(&cmd);
1247 }
1248
1249 struct alternate_refs_data {
1250         alternate_ref_fn *fn;
1251         void *data;
1252 };
1253
1254 static int refs_from_alternate_cb(struct alternate_object_database *e,
1255                                   void *data)
1256 {
1257         struct strbuf path = STRBUF_INIT;
1258         size_t base_len;
1259         struct alternate_refs_data *cb = data;
1260
1261         if (!strbuf_realpath(&path, e->path, 0))
1262                 goto out;
1263         if (!strbuf_strip_suffix(&path, "/objects"))
1264                 goto out;
1265         base_len = path.len;
1266
1267         /* Is this a git repository with refs? */
1268         strbuf_addstr(&path, "/refs");
1269         if (!is_directory(path.buf))
1270                 goto out;
1271         strbuf_setlen(&path, base_len);
1272
1273         read_alternate_refs(path.buf, cb->fn, cb->data);
1274
1275 out:
1276         strbuf_release(&path);
1277         return 0;
1278 }
1279
1280 void for_each_alternate_ref(alternate_ref_fn fn, void *data)
1281 {
1282         struct alternate_refs_data cb;
1283         cb.fn = fn;
1284         cb.data = data;
1285         foreach_alt_odb(refs_from_alternate_cb, &cb);
1286 }