git.oblomov.eu Git - git/blob - 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 #include "transport-internal.h"
  21 #include "protocol.h"
  22
  23 static void set_upstreams(struct transport *transport, struct ref *refs,
  24         int pretend)
  25 {
  26         struct ref *ref;
  27         for (ref = refs; ref; ref = ref->next) {
  28                 const char *localname;
  29                 const char *tmp;
  30                 const char *remotename;
  31                 int flag = 0;
  32                 /*
  33                  * Check suitability for tracking. Must be successful /
  34                  * already up-to-date ref create/modify (not delete).
  35                  */
  36                 if (ref->status != REF_STATUS_OK &&
  37                         ref->status != REF_STATUS_UPTODATE)
  38                         continue;
  39                 if (!ref->peer_ref)
  40                         continue;
  41                 if (is_null_oid(&ref->new_oid))
  42                         continue;
  43
  44                 /* Follow symbolic refs (mainly for HEAD). */
  45                 localname = ref->peer_ref->name;
  46                 remotename = ref->name;
  47                 tmp = resolve_ref_unsafe(localname, RESOLVE_REF_READING,
  48                                          NULL, &flag);
  49                 if (tmp && flag & REF_ISSYMREF &&
  50                         starts_with(tmp, "refs/heads/"))
  51                         localname = tmp;
  52
  53                 /* Both source and destination must be local branches. */
  54                 if (!localname || !starts_with(localname, "refs/heads/"))
  55                         continue;
  56                 if (!remotename || !starts_with(remotename, "refs/heads/"))
  57                         continue;
  58
  59                 if (!pretend)
  60                         install_branch_config(BRANCH_CONFIG_VERBOSE,
  61                                 localname + 11, transport->remote->name,
  62                                 remotename);
  63                 else
  64                         printf(_("Would set upstream of '%s' to '%s' of '%s'\n"),
  65                                 localname + 11, remotename + 11,
  66                                 transport->remote->name);
  67         }
  68 }
  69
  70 struct bundle_transport_data {
  71         int fd;
  72         struct bundle_header header;
  73 };
  74
  75 static struct ref *get_refs_from_bundle(struct transport *transport,
  76                                         int for_push,
  77                                         const struct argv_array *ref_prefixes)
  78 {
  79         struct bundle_transport_data *data = transport->data;
  80         struct ref *result = NULL;
  81         int i;
  82
  83         if (for_push)
  84                 return NULL;
  85
  86         if (data->fd > 0)
  87                 close(data->fd);
  88         data->fd = read_bundle_header(transport->url, &data->header);
  89         if (data->fd < 0)
  90                 die ("Could not read bundle '%s'.", transport->url);
  91         for (i = 0; i < data->header.references.nr; i++) {
  92                 struct ref_list_entry *e = data->header.references.list + i;
  93                 struct ref *ref = alloc_ref(e->name);
  94                 oidcpy(&ref->old_oid, &e->oid);
  95                 ref->next = result;
  96                 result = ref;
  97         }
  98         return result;
  99 }
 100
 101 static int fetch_refs_from_bundle(struct transport *transport,
 102                                int nr_heads, struct ref **to_fetch)
 103 {
 104         struct bundle_transport_data *data = transport->data;
 105         return unbundle(&data->header, data->fd,
 106                         transport->progress ? BUNDLE_VERBOSE : 0);
 107 }
 108
 109 static int close_bundle(struct transport *transport)
 110 {
 111         struct bundle_transport_data *data = transport->data;
 112         if (data->fd > 0)
 113                 close(data->fd);
 114         free(data);
 115         return 0;
 116 }
 117
 118 struct git_transport_data {
 119         struct git_transport_options options;
 120         struct child_process *conn;
 121         int fd[2];
 122         unsigned got_remote_heads : 1;
 123         enum protocol_version version;
 124         struct oid_array extra_have;
 125         struct oid_array shallow;
 126 };
 127
 128 static int set_git_option(struct git_transport_options *opts,
 129                           const char *name, const char *value)
 130 {
 131         if (!strcmp(name, TRANS_OPT_UPLOADPACK)) {
 132                 opts->uploadpack = value;
 133                 return 0;
 134         } else if (!strcmp(name, TRANS_OPT_RECEIVEPACK)) {
 135                 opts->receivepack = value;
 136                 return 0;
 137         } else if (!strcmp(name, TRANS_OPT_THIN)) {
 138                 opts->thin = !!value;
 139                 return 0;
 140         } else if (!strcmp(name, TRANS_OPT_FOLLOWTAGS)) {
 141                 opts->followtags = !!value;
 142                 return 0;
 143         } else if (!strcmp(name, TRANS_OPT_KEEP)) {
 144                 opts->keep = !!value;
 145                 return 0;
 146         } else if (!strcmp(name, TRANS_OPT_UPDATE_SHALLOW)) {
 147                 opts->update_shallow = !!value;
 148                 return 0;
 149         } else if (!strcmp(name, TRANS_OPT_DEPTH)) {
 150                 if (!value)
 151                         opts->depth = 0;
 152                 else {
 153                         char *end;
 154                         opts->depth = strtol(value, &end, 0);
 155                         if (*end)
 156                                 die(_("transport: invalid depth option '%s'"), value);
 157                 }
 158                 return 0;
 159         } else if (!strcmp(name, TRANS_OPT_DEEPEN_SINCE)) {
 160                 opts->deepen_since = value;
 161                 return 0;
 162         } else if (!strcmp(name, TRANS_OPT_DEEPEN_NOT)) {
 163                 opts->deepen_not = (const struct string_list *)value;
 164                 return 0;
 165         } else if (!strcmp(name, TRANS_OPT_DEEPEN_RELATIVE)) {
 166                 opts->deepen_relative = !!value;
 167                 return 0;
 168         }
 169         return 1;
 170 }
 171
 172 static int connect_setup(struct transport *transport, int for_push)
 173 {
 174         struct git_transport_data *data = transport->data;
 175         int flags = transport->verbose > 0 ? CONNECT_VERBOSE : 0;
 176
 177         if (data->conn)
 178                 return 0;
 179
 180         switch (transport->family) {
 181         case TRANSPORT_FAMILY_ALL: break;
 182         case TRANSPORT_FAMILY_IPV4: flags |= CONNECT_IPV4; break;
 183         case TRANSPORT_FAMILY_IPV6: flags |= CONNECT_IPV6; break;
 184         }
 185
 186         data->conn = git_connect(data->fd, transport->url,
 187                                  for_push ? data->options.receivepack :
 188                                  data->options.uploadpack,
 189                                  flags);
 190
 191         return 0;
 192 }
 193
 194 static struct ref *get_refs_via_connect(struct transport *transport, int for_push,
 195                                         const struct argv_array *ref_prefixes)
 196 {
 197         struct git_transport_data *data = transport->data;
 198         struct ref *refs = NULL;
 199         struct packet_reader reader;
 200
 201         connect_setup(transport, for_push);
 202
 203         packet_reader_init(&reader, data->fd[0], NULL, 0,
 204                            PACKET_READ_CHOMP_NEWLINE |
 205                            PACKET_READ_GENTLE_ON_EOF);
 206
 207         data->version = discover_version(&reader);
 208         switch (data->version) {
 209         case protocol_v2:
 210                 get_remote_refs(data->fd[1], &reader, &refs, for_push,
 211                                 ref_prefixes);
 212                 break;
 213         case protocol_v1:
 214         case protocol_v0:
 215                 get_remote_heads(&reader, &refs,
 216                                  for_push ? REF_NORMAL : 0,
 217                                  &data->extra_have,
 218                                  &data->shallow);
 219                 break;
 220         case protocol_unknown_version:
 221                 BUG("unknown protocol version");
 222         }
 223         data->got_remote_heads = 1;
 224
 225         return refs;
 226 }
 227
 228 static int fetch_refs_via_pack(struct transport *transport,
 229                                int nr_heads, struct ref **to_fetch)
 230 {
 231         int ret = 0;
 232         struct git_transport_data *data = transport->data;
 233         struct ref *refs = NULL;
 234         char *dest = xstrdup(transport->url);
 235         struct fetch_pack_args args;
 236         struct ref *refs_tmp = NULL;
 237
 238         memset(&args, 0, sizeof(args));
 239         args.uploadpack = data->options.uploadpack;
 240         args.keep_pack = data->options.keep;
 241         args.lock_pack = 1;
 242         args.use_thin_pack = data->options.thin;
 243         args.include_tag = data->options.followtags;
 244         args.verbose = (transport->verbose > 1);
 245         args.quiet = (transport->verbose < 0);
 246         args.no_progress = !transport->progress;
 247         args.depth = data->options.depth;
 248         args.deepen_since = data->options.deepen_since;
 249         args.deepen_not = data->options.deepen_not;
 250         args.deepen_relative = data->options.deepen_relative;
 251         args.check_self_contained_and_connected =
 252                 data->options.check_self_contained_and_connected;
 253         args.cloning = transport->cloning;
 254         args.update_shallow = data->options.update_shallow;
 255
 256         if (!data->got_remote_heads)
 257                 refs_tmp = get_refs_via_connect(transport, 0, NULL);
 258
 259         switch (data->version) {
 260         case protocol_v2:
 261                 die("support for protocol v2 not implemented yet");
 262                 break;
 263         case protocol_v1:
 264         case protocol_v0:
 265                 refs = fetch_pack(&args, data->fd, data->conn,
 266                                   refs_tmp ? refs_tmp : transport->remote_refs,
 267                                   dest, to_fetch, nr_heads, &data->shallow,
 268                                   &transport->pack_lockfile);
 269                 break;
 270         case protocol_unknown_version:
 271                 BUG("unknown protocol version");
 272         }
 273
 274         close(data->fd[0]);
 275         close(data->fd[1]);
 276         if (finish_connect(data->conn))
 277                 ret = -1;
 278         data->conn = NULL;
 279         data->got_remote_heads = 0;
 280         data->options.self_contained_and_connected =
 281                 args.self_contained_and_connected;
 282
 283         if (refs == NULL)
 284                 ret = -1;
 285         if (report_unmatched_refs(to_fetch, nr_heads))
 286                 ret = -1;
 287
 288         free_refs(refs_tmp);
 289         free_refs(refs);
 290         free(dest);
 291         return ret;
 292 }
 293
 294 static int push_had_errors(struct ref *ref)
 295 {
 296         for (; ref; ref = ref->next) {
 297                 switch (ref->status) {
 298                 case REF_STATUS_NONE:
 299                 case REF_STATUS_UPTODATE:
 300                 case REF_STATUS_OK:
 301                         break;
 302                 default:
 303                         return 1;
 304                 }
 305         }
 306         return 0;
 307 }
 308
 309 int transport_refs_pushed(struct ref *ref)
 310 {
 311         for (; ref; ref = ref->next) {
 312                 switch(ref->status) {
 313                 case REF_STATUS_NONE:
 314                 case REF_STATUS_UPTODATE:
 315                         break;
 316                 default:
 317                         return 1;
 318                 }
 319         }
 320         return 0;
 321 }
 322
 323 void transport_update_tracking_ref(struct remote *remote, struct ref *ref, int verbose)
 324 {
 325         struct refspec rs;
 326
 327         if (ref->status != REF_STATUS_OK && ref->status != REF_STATUS_UPTODATE)
 328                 return;
 329
 330         rs.src = ref->name;
 331         rs.dst = NULL;
 332
 333         if (!remote_find_tracking(remote, &rs)) {
 334                 if (verbose)
 335                         fprintf(stderr, "updating local tracking ref '%s'\n", rs.dst);
 336                 if (ref->deletion) {
 337                         delete_ref(NULL, rs.dst, NULL, 0);
 338                 } else
 339                         update_ref("update by push", rs.dst, &ref->new_oid,
 340                                    NULL, 0, 0);
 341                 free(rs.dst);
 342         }
 343 }
 344
 345 static void print_ref_status(char flag, const char *summary,
 346                              struct ref *to, struct ref *from, const char *msg,
 347                              int porcelain, int summary_width)
 348 {
 349         if (porcelain) {
 350                 if (from)
 351                         fprintf(stdout, "%c\t%s:%s\t", flag, from->name, to->name);
 352                 else
 353                         fprintf(stdout, "%c\t:%s\t", flag, to->name);
 354                 if (msg)
 355                         fprintf(stdout, "%s (%s)\n", summary, msg);
 356                 else
 357                         fprintf(stdout, "%s\n", summary);
 358         } else {
 359                 fprintf(stderr, " %c %-*s ", flag, summary_width, summary);
 360                 if (from)
 361                         fprintf(stderr, "%s -> %s", prettify_refname(from->name), prettify_refname(to->name));
 362                 else
 363                         fputs(prettify_refname(to->name), stderr);
 364                 if (msg) {
 365                         fputs(" (", stderr);
 366                         fputs(msg, stderr);
 367                         fputc(')', stderr);
 368                 }
 369                 fputc('\n', stderr);
 370         }
 371 }
 372
 373 static void print_ok_ref_status(struct ref *ref, int porcelain, int summary_width)
 374 {
 375         if (ref->deletion)
 376                 print_ref_status('-', "[deleted]", ref, NULL, NULL,
 377                                  porcelain, summary_width);
 378         else if (is_null_oid(&ref->old_oid))
 379                 print_ref_status('*',
 380                         (starts_with(ref->name, "refs/tags/") ? "[new tag]" :
 381                         "[new branch]"),
 382                         ref, ref->peer_ref, NULL, porcelain, summary_width);
 383         else {
 384                 struct strbuf quickref = STRBUF_INIT;
 385                 char type;
 386                 const char *msg;
 387
 388                 strbuf_add_unique_abbrev(&quickref, ref->old_oid.hash,
 389                                          DEFAULT_ABBREV);
 390                 if (ref->forced_update) {
 391                         strbuf_addstr(&quickref, "...");
 392                         type = '+';
 393                         msg = "forced update";
 394                 } else {
 395                         strbuf_addstr(&quickref, "..");
 396                         type = ' ';
 397                         msg = NULL;
 398                 }
 399                 strbuf_add_unique_abbrev(&quickref, ref->new_oid.hash,
 400                                          DEFAULT_ABBREV);
 401
 402                 print_ref_status(type, quickref.buf, ref, ref->peer_ref, msg,
 403                                  porcelain, summary_width);
 404                 strbuf_release(&quickref);
 405         }
 406 }
 407
 408 static int print_one_push_status(struct ref *ref, const char *dest, int count,
 409                                  int porcelain, int summary_width)
 410 {
 411         if (!count) {
 412                 char *url = transport_anonymize_url(dest);
 413                 fprintf(porcelain ? stdout : stderr, "To %s\n", url);
 414                 free(url);
 415         }
 416
 417         switch(ref->status) {
 418         case REF_STATUS_NONE:
 419                 print_ref_status('X', "[no match]", ref, NULL, NULL,
 420                                  porcelain, summary_width);
 421                 break;
 422         case REF_STATUS_REJECT_NODELETE:
 423                 print_ref_status('!', "[rejected]", ref, NULL,
 424                                  "remote does not support deleting refs",
 425                                  porcelain, summary_width);
 426                 break;
 427         case REF_STATUS_UPTODATE:
 428                 print_ref_status('=', "[up to date]", ref,
 429                                  ref->peer_ref, NULL, porcelain, summary_width);
 430                 break;
 431         case REF_STATUS_REJECT_NONFASTFORWARD:
 432                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 433                                  "non-fast-forward", porcelain, summary_width);
 434                 break;
 435         case REF_STATUS_REJECT_ALREADY_EXISTS:
 436                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 437                                  "already exists", porcelain, summary_width);
 438                 break;
 439         case REF_STATUS_REJECT_FETCH_FIRST:
 440                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 441                                  "fetch first", porcelain, summary_width);
 442                 break;
 443         case REF_STATUS_REJECT_NEEDS_FORCE:
 444                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 445                                  "needs force", porcelain, summary_width);
 446                 break;
 447         case REF_STATUS_REJECT_STALE:
 448                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 449                                  "stale info", porcelain, summary_width);
 450                 break;
 451         case REF_STATUS_REJECT_SHALLOW:
 452                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 453                                  "new shallow roots not allowed",
 454                                  porcelain, summary_width);
 455                 break;
 456         case REF_STATUS_REMOTE_REJECT:
 457                 print_ref_status('!', "[remote rejected]", ref,
 458                                  ref->deletion ? NULL : ref->peer_ref,
 459                                  ref->remote_status, porcelain, summary_width);
 460                 break;
 461         case REF_STATUS_EXPECTING_REPORT:
 462                 print_ref_status('!', "[remote failure]", ref,
 463                                  ref->deletion ? NULL : ref->peer_ref,
 464                                  "remote failed to report status",
 465                                  porcelain, summary_width);
 466                 break;
 467         case REF_STATUS_ATOMIC_PUSH_FAILED:
 468                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 469                                  "atomic push failed", porcelain, summary_width);
 470                 break;
 471         case REF_STATUS_OK:
 472                 print_ok_ref_status(ref, porcelain, summary_width);
 473                 break;
 474         }
 475
 476         return 1;
 477 }
 478
 479 static int measure_abbrev(const struct object_id *oid, int sofar)
 480 {
 481         char hex[GIT_MAX_HEXSZ + 1];
 482         int w = find_unique_abbrev_r(hex, oid->hash, DEFAULT_ABBREV);
 483
 484         return (w < sofar) ? sofar : w;
 485 }
 486
 487 int transport_summary_width(const struct ref *refs)
 488 {
 489         int maxw = -1;
 490
 491         for (; refs; refs = refs->next) {
 492                 maxw = measure_abbrev(&refs->old_oid, maxw);
 493                 maxw = measure_abbrev(&refs->new_oid, maxw);
 494         }
 495         if (maxw < 0)
 496                 maxw = FALLBACK_DEFAULT_ABBREV;
 497         return (2 * maxw + 3);
 498 }
 499
 500 void transport_print_push_status(const char *dest, struct ref *refs,
 501                                   int verbose, int porcelain, unsigned int *reject_reasons)
 502 {
 503         struct ref *ref;
 504         int n = 0;
 505         char *head;
 506         int summary_width = transport_summary_width(refs);
 507
 508         head = resolve_refdup("HEAD", RESOLVE_REF_READING, NULL, NULL);
 509
 510         if (verbose) {
 511                 for (ref = refs; ref; ref = ref->next)
 512                         if (ref->status == REF_STATUS_UPTODATE)
 513                                 n += print_one_push_status(ref, dest, n,
 514                                                            porcelain, summary_width);
 515         }
 516
 517         for (ref = refs; ref; ref = ref->next)
 518                 if (ref->status == REF_STATUS_OK)
 519                         n += print_one_push_status(ref, dest, n,
 520                                                    porcelain, summary_width);
 521
 522         *reject_reasons = 0;
 523         for (ref = refs; ref; ref = ref->next) {
 524                 if (ref->status != REF_STATUS_NONE &&
 525                     ref->status != REF_STATUS_UPTODATE &&
 526                     ref->status != REF_STATUS_OK)
 527                         n += print_one_push_status(ref, dest, n,
 528                                                    porcelain, summary_width);
 529                 if (ref->status == REF_STATUS_REJECT_NONFASTFORWARD) {
 530                         if (head != NULL && !strcmp(head, ref->name))
 531                                 *reject_reasons |= REJECT_NON_FF_HEAD;
 532                         else
 533                                 *reject_reasons |= REJECT_NON_FF_OTHER;
 534                 } else if (ref->status == REF_STATUS_REJECT_ALREADY_EXISTS) {
 535                         *reject_reasons |= REJECT_ALREADY_EXISTS;
 536                 } else if (ref->status == REF_STATUS_REJECT_FETCH_FIRST) {
 537                         *reject_reasons |= REJECT_FETCH_FIRST;
 538                 } else if (ref->status == REF_STATUS_REJECT_NEEDS_FORCE) {
 539                         *reject_reasons |= REJECT_NEEDS_FORCE;
 540                 }
 541         }
 542         free(head);
 543 }
 544
 545 void transport_verify_remote_names(int nr_heads, const char **heads)
 546 {
 547         int i;
 548
 549         for (i = 0; i < nr_heads; i++) {
 550                 const char *local = heads[i];
 551                 const char *remote = strrchr(heads[i], ':');
 552
 553                 if (*local == '+')
 554                         local++;
 555
 556                 /* A matching refspec is okay.  */
 557                 if (remote == local && remote[1] == '\0')
 558                         continue;
 559
 560                 remote = remote ? (remote + 1) : local;
 561                 if (check_refname_format(remote,
 562                                 REFNAME_ALLOW_ONELEVEL|REFNAME_REFSPEC_PATTERN))
 563                         die("remote part of refspec is not a valid name in %s",
 564                                 heads[i]);
 565         }
 566 }
 567
 568 static int git_transport_push(struct transport *transport, struct ref *remote_refs, int flags)
 569 {
 570         struct git_transport_data *data = transport->data;
 571         struct send_pack_args args;
 572         int ret = 0;
 573
 574         if (!data->got_remote_heads)
 575                 get_refs_via_connect(transport, 1, NULL);
 576
 577         memset(&args, 0, sizeof(args));
 578         args.send_mirror = !!(flags & TRANSPORT_PUSH_MIRROR);
 579         args.force_update = !!(flags & TRANSPORT_PUSH_FORCE);
 580         args.use_thin_pack = data->options.thin;
 581         args.verbose = (transport->verbose > 0);
 582         args.quiet = (transport->verbose < 0);
 583         args.progress = transport->progress;
 584         args.dry_run = !!(flags & TRANSPORT_PUSH_DRY_RUN);
 585         args.porcelain = !!(flags & TRANSPORT_PUSH_PORCELAIN);
 586         args.atomic = !!(flags & TRANSPORT_PUSH_ATOMIC);
 587         args.push_options = transport->push_options;
 588         args.url = transport->url;
 589
 590         if (flags & TRANSPORT_PUSH_CERT_ALWAYS)
 591                 args.push_cert = SEND_PACK_PUSH_CERT_ALWAYS;
 592         else if (flags & TRANSPORT_PUSH_CERT_IF_ASKED)
 593                 args.push_cert = SEND_PACK_PUSH_CERT_IF_ASKED;
 594         else
 595                 args.push_cert = SEND_PACK_PUSH_CERT_NEVER;
 596
 597         switch (data->version) {
 598         case protocol_v2:
 599                 die("support for protocol v2 not implemented yet");
 600                 break;
 601         case protocol_v1:
 602         case protocol_v0:
 603                 ret = send_pack(&args, data->fd, data->conn, remote_refs,
 604                                 &data->extra_have);
 605                 break;
 606         case protocol_unknown_version:
 607                 BUG("unknown protocol version");
 608         }
 609
 610         close(data->fd[1]);
 611         close(data->fd[0]);
 612         ret |= finish_connect(data->conn);
 613         data->conn = NULL;
 614         data->got_remote_heads = 0;
 615
 616         return ret;
 617 }
 618
 619 static int connect_git(struct transport *transport, const char *name,
 620                        const char *executable, int fd[2])
 621 {
 622         struct git_transport_data *data = transport->data;
 623         data->conn = git_connect(data->fd, transport->url,
 624                                  executable, 0);
 625         fd[0] = data->fd[0];
 626         fd[1] = data->fd[1];
 627         return 0;
 628 }
 629
 630 static int disconnect_git(struct transport *transport)
 631 {
 632         struct git_transport_data *data = transport->data;
 633         if (data->conn) {
 634                 if (data->got_remote_heads)
 635                         packet_flush(data->fd[1]);
 636                 close(data->fd[0]);
 637                 close(data->fd[1]);
 638                 finish_connect(data->conn);
 639         }
 640
 641         free(data);
 642         return 0;
 643 }
 644
 645 static struct transport_vtable taken_over_vtable = {
 646         NULL,
 647         get_refs_via_connect,
 648         fetch_refs_via_pack,
 649         git_transport_push,
 650         NULL,
 651         disconnect_git
 652 };
 653
 654 void transport_take_over(struct transport *transport,
 655                          struct child_process *child)
 656 {
 657         struct git_transport_data *data;
 658
 659         if (!transport->smart_options)
 660                 die("BUG: taking over transport requires non-NULL "
 661                     "smart_options field.");
 662
 663         data = xcalloc(1, sizeof(*data));
 664         data->options = *transport->smart_options;
 665         data->conn = child;
 666         data->fd[0] = data->conn->out;
 667         data->fd[1] = data->conn->in;
 668         data->got_remote_heads = 0;
 669         transport->data = data;
 670
 671         transport->vtable = &taken_over_vtable;
 672         transport->smart_options = &(data->options);
 673
 674         transport->cannot_reuse = 1;
 675 }
 676
 677 static int is_file(const char *url)
 678 {
 679         struct stat buf;
 680         if (stat(url, &buf))
 681                 return 0;
 682         return S_ISREG(buf.st_mode);
 683 }
 684
 685 static int external_specification_len(const char *url)
 686 {
 687         return strchr(url, ':') - url;
 688 }
 689
 690 static const struct string_list *protocol_whitelist(void)
 691 {
 692         static int enabled = -1;
 693         static struct string_list allowed = STRING_LIST_INIT_DUP;
 694
 695         if (enabled < 0) {
 696                 const char *v = getenv("GIT_ALLOW_PROTOCOL");
 697                 if (v) {
 698                         string_list_split(&allowed, v, ':', -1);
 699                         string_list_sort(&allowed);
 700                         enabled = 1;
 701                 } else {
 702                         enabled = 0;
 703                 }
 704         }
 705
 706         return enabled ? &allowed : NULL;
 707 }
 708
 709 enum protocol_allow_config {
 710         PROTOCOL_ALLOW_NEVER = 0,
 711         PROTOCOL_ALLOW_USER_ONLY,
 712         PROTOCOL_ALLOW_ALWAYS
 713 };
 714
 715 static enum protocol_allow_config parse_protocol_config(const char *key,
 716                                                         const char *value)
 717 {
 718         if (!strcasecmp(value, "always"))
 719                 return PROTOCOL_ALLOW_ALWAYS;
 720         else if (!strcasecmp(value, "never"))
 721                 return PROTOCOL_ALLOW_NEVER;
 722         else if (!strcasecmp(value, "user"))
 723                 return PROTOCOL_ALLOW_USER_ONLY;
 724
 725         die("unknown value for config '%s': %s", key, value);
 726 }
 727
 728 static enum protocol_allow_config get_protocol_config(const char *type)
 729 {
 730         char *key = xstrfmt("protocol.%s.allow", type);
 731         char *value;
 732
 733         /* first check the per-protocol config */
 734         if (!git_config_get_string(key, &value)) {
 735                 enum protocol_allow_config ret =
 736                         parse_protocol_config(key, value);
 737                 free(key);
 738                 free(value);
 739                 return ret;
 740         }
 741         free(key);
 742
 743         /* if defined, fallback to user-defined default for unknown protocols */
 744         if (!git_config_get_string("protocol.allow", &value)) {
 745                 enum protocol_allow_config ret =
 746                         parse_protocol_config("protocol.allow", value);
 747                 free(value);
 748                 return ret;
 749         }
 750
 751         /* fallback to built-in defaults */
 752         /* known safe */
 753         if (!strcmp(type, "http") ||
 754             !strcmp(type, "https") ||
 755             !strcmp(type, "git") ||
 756             !strcmp(type, "ssh") ||
 757             !strcmp(type, "file"))
 758                 return PROTOCOL_ALLOW_ALWAYS;
 759
 760         /* known scary; err on the side of caution */
 761         if (!strcmp(type, "ext"))
 762                 return PROTOCOL_ALLOW_NEVER;
 763
 764         /* unknown; by default let them be used only directly by the user */
 765         return PROTOCOL_ALLOW_USER_ONLY;
 766 }
 767
 768 int is_transport_allowed(const char *type, int from_user)
 769 {
 770         const struct string_list *whitelist = protocol_whitelist();
 771         if (whitelist)
 772                 return string_list_has_string(whitelist, type);
 773
 774         switch (get_protocol_config(type)) {
 775         case PROTOCOL_ALLOW_ALWAYS:
 776                 return 1;
 777         case PROTOCOL_ALLOW_NEVER:
 778                 return 0;
 779         case PROTOCOL_ALLOW_USER_ONLY:
 780                 if (from_user < 0)
 781                         from_user = git_env_bool("GIT_PROTOCOL_FROM_USER", 1);
 782                 return from_user;
 783         }
 784
 785         die("BUG: invalid protocol_allow_config type");
 786 }
 787
 788 void transport_check_allowed(const char *type)
 789 {
 790         if (!is_transport_allowed(type, -1))
 791                 die("transport '%s' not allowed", type);
 792 }
 793
 794 static struct transport_vtable bundle_vtable = {
 795         NULL,
 796         get_refs_from_bundle,
 797         fetch_refs_from_bundle,
 798         NULL,
 799         NULL,
 800         close_bundle
 801 };
 802
 803 static struct transport_vtable builtin_smart_vtable = {
 804         NULL,
 805         get_refs_via_connect,
 806         fetch_refs_via_pack,
 807         git_transport_push,
 808         connect_git,
 809         disconnect_git
 810 };
 811
 812 struct transport *transport_get(struct remote *remote, const char *url)
 813 {
 814         const char *helper;
 815         struct transport *ret = xcalloc(1, sizeof(*ret));
 816
 817         ret->progress = isatty(2);
 818
 819         if (!remote)
 820                 die("No remote provided to transport_get()");
 821
 822         ret->got_remote_refs = 0;
 823         ret->remote = remote;
 824         helper = remote->foreign_vcs;
 825
 826         if (!url && remote->url)
 827                 url = remote->url[0];
 828         ret->url = url;
 829
 830         /* maybe it is a foreign URL? */
 831         if (url) {
 832                 const char *p = url;
 833
 834                 while (is_urlschemechar(p == url, *p))
 835                         p++;
 836                 if (starts_with(p, "::"))
 837                         helper = xstrndup(url, p - url);
 838         }
 839
 840         if (helper) {
 841                 transport_helper_init(ret, helper);
 842         } else if (starts_with(url, "rsync:")) {
 843                 die("git-over-rsync is no longer supported");
 844         } else if (url_is_local_not_ssh(url) && is_file(url) && is_bundle(url, 1)) {
 845                 struct bundle_transport_data *data = xcalloc(1, sizeof(*data));
 846                 transport_check_allowed("file");
 847                 ret->data = data;
 848                 ret->vtable = &bundle_vtable;
 849                 ret->smart_options = NULL;
 850         } else if (!is_url(url)
 851                 || starts_with(url, "file://")
 852                 || starts_with(url, "git://")
 853                 || starts_with(url, "ssh://")
 854                 || starts_with(url, "git+ssh://") /* deprecated - do not use */
 855                 || starts_with(url, "ssh+git://") /* deprecated - do not use */
 856                 ) {
 857                 /*
 858                  * These are builtin smart transports; "allowed" transports
 859                  * will be checked individually in git_connect.
 860                  */
 861                 struct git_transport_data *data = xcalloc(1, sizeof(*data));
 862                 ret->data = data;
 863                 ret->vtable = &builtin_smart_vtable;
 864                 ret->smart_options = &(data->options);
 865
 866                 data->conn = NULL;
 867                 data->got_remote_heads = 0;
 868         } else {
 869                 /* Unknown protocol in URL. Pass to external handler. */
 870                 int len = external_specification_len(url);
 871                 char *handler = xmemdupz(url, len);
 872                 transport_helper_init(ret, handler);
 873         }
 874
 875         if (ret->smart_options) {
 876                 ret->smart_options->thin = 1;
 877                 ret->smart_options->uploadpack = "git-upload-pack";
 878                 if (remote->uploadpack)
 879                         ret->smart_options->uploadpack = remote->uploadpack;
 880                 ret->smart_options->receivepack = "git-receive-pack";
 881                 if (remote->receivepack)
 882                         ret->smart_options->receivepack = remote->receivepack;
 883         }
 884
 885         return ret;
 886 }
 887
 888 int transport_set_option(struct transport *transport,
 889                          const char *name, const char *value)
 890 {
 891         int git_reports = 1, protocol_reports = 1;
 892
 893         if (transport->smart_options)
 894                 git_reports = set_git_option(transport->smart_options,
 895                                              name, value);
 896
 897         if (transport->vtable->set_option)
 898                 protocol_reports = transport->vtable->set_option(transport,
 899                                                                  name, value);
 900
 901         /* If either report is 0, report 0 (success). */
 902         if (!git_reports || !protocol_reports)
 903                 return 0;
 904         /* If either reports -1 (invalid value), report -1. */
 905         if ((git_reports == -1) || (protocol_reports == -1))
 906                 return -1;
 907         /* Otherwise if both report unknown, report unknown. */
 908         return 1;
 909 }
 910
 911 void transport_set_verbosity(struct transport *transport, int verbosity,
 912         int force_progress)
 913 {
 914         if (verbosity >= 1)
 915                 transport->verbose = verbosity <= 3 ? verbosity : 3;
 916         if (verbosity < 0)
 917                 transport->verbose = -1;
 918
 919         /**
 920          * Rules used to determine whether to report progress (processing aborts
 921          * when a rule is satisfied):
 922          *
 923          *   . Report progress, if force_progress is 1 (ie. --progress).
 924          *   . Don't report progress, if force_progress is 0 (ie. --no-progress).
 925          *   . Don't report progress, if verbosity < 0 (ie. -q/--quiet ).
 926          *   . Report progress if isatty(2) is 1.
 927          **/
 928         if (force_progress >= 0)
 929                 transport->progress = !!force_progress;
 930         else
 931                 transport->progress = verbosity >= 0 && isatty(2);
 932 }
 933
 934 static void die_with_unpushed_submodules(struct string_list *needs_pushing)
 935 {
 936         int i;
 937
 938         fprintf(stderr, _("The following submodule paths contain changes that can\n"
 939                         "not be found on any remote:\n"));
 940         for (i = 0; i < needs_pushing->nr; i++)
 941                 fprintf(stderr, "  %s\n", needs_pushing->items[i].string);
 942         fprintf(stderr, _("\nPlease try\n\n"
 943                           "     git push --recurse-submodules=on-demand\n\n"
 944                           "or cd to the path and use\n\n"
 945                           "     git push\n\n"
 946                           "to push them to a remote.\n\n"));
 947
 948         string_list_clear(needs_pushing, 0);
 949
 950         die(_("Aborting."));
 951 }
 952
 953 static int run_pre_push_hook(struct transport *transport,
 954                              struct ref *remote_refs)
 955 {
 956         int ret = 0, x;
 957         struct ref *r;
 958         struct child_process proc = CHILD_PROCESS_INIT;
 959         struct strbuf buf;
 960         const char *argv[4];
 961
 962         if (!(argv[0] = find_hook("pre-push")))
 963                 return 0;
 964
 965         argv[1] = transport->remote->name;
 966         argv[2] = transport->url;
 967         argv[3] = NULL;
 968
 969         proc.argv = argv;
 970         proc.in = -1;
 971
 972         if (start_command(&proc)) {
 973                 finish_command(&proc);
 974                 return -1;
 975         }
 976
 977         sigchain_push(SIGPIPE, SIG_IGN);
 978
 979         strbuf_init(&buf, 256);
 980
 981         for (r = remote_refs; r; r = r->next) {
 982                 if (!r->peer_ref) continue;
 983                 if (r->status == REF_STATUS_REJECT_NONFASTFORWARD) continue;
 984                 if (r->status == REF_STATUS_REJECT_STALE) continue;
 985                 if (r->status == REF_STATUS_UPTODATE) continue;
 986
 987                 strbuf_reset(&buf);
 988                 strbuf_addf( &buf, "%s %s %s %s\n",
 989                          r->peer_ref->name, oid_to_hex(&r->new_oid),
 990                          r->name, oid_to_hex(&r->old_oid));
 991
 992                 if (write_in_full(proc.in, buf.buf, buf.len) < 0) {
 993                         /* We do not mind if a hook does not read all refs. */
 994                         if (errno != EPIPE)
 995                                 ret = -1;
 996                         break;
 997                 }
 998         }
 999
1000         strbuf_release(&buf);
1001
1002         x = close(proc.in);
1003         if (!ret)
1004                 ret = x;
1005
1006         sigchain_pop(SIGPIPE);
1007
1008         x = finish_command(&proc);
1009         if (!ret)
1010                 ret = x;
1011
1012         return ret;
1013 }
1014
1015 int transport_push(struct transport *transport,
1016                    int refspec_nr, const char **refspec, int flags,
1017                    unsigned int *reject_reasons)
1018 {
1019         *reject_reasons = 0;
1020         transport_verify_remote_names(refspec_nr, refspec);
1021
1022         if (transport->vtable->push_refs) {
1023                 struct ref *remote_refs;
1024                 struct ref *local_refs = get_local_heads();
1025                 int match_flags = MATCH_REFS_NONE;
1026                 int verbose = (transport->verbose > 0);
1027                 int quiet = (transport->verbose < 0);
1028                 int porcelain = flags & TRANSPORT_PUSH_PORCELAIN;
1029                 int pretend = flags & TRANSPORT_PUSH_DRY_RUN;
1030                 int push_ret, ret, err;
1031
1032                 if (check_push_refs(local_refs, refspec_nr, refspec) < 0)
1033                         return -1;
1034
1035                 remote_refs = transport->vtable->get_refs_list(transport, 1, NULL);
1036
1037                 if (flags & TRANSPORT_PUSH_ALL)
1038                         match_flags |= MATCH_REFS_ALL;
1039                 if (flags & TRANSPORT_PUSH_MIRROR)
1040                         match_flags |= MATCH_REFS_MIRROR;
1041                 if (flags & TRANSPORT_PUSH_PRUNE)
1042                         match_flags |= MATCH_REFS_PRUNE;
1043                 if (flags & TRANSPORT_PUSH_FOLLOW_TAGS)
1044                         match_flags |= MATCH_REFS_FOLLOW_TAGS;
1045
1046                 if (match_push_refs(local_refs, &remote_refs,
1047                                     refspec_nr, refspec, match_flags)) {
1048                         return -1;
1049                 }
1050
1051                 if (transport->smart_options &&
1052                     transport->smart_options->cas &&
1053                     !is_empty_cas(transport->smart_options->cas))
1054                         apply_push_cas(transport->smart_options->cas,
1055                                        transport->remote, remote_refs);
1056
1057                 set_ref_status_for_push(remote_refs,
1058                         flags & TRANSPORT_PUSH_MIRROR,
1059                         flags & TRANSPORT_PUSH_FORCE);
1060
1061                 if (!(flags & TRANSPORT_PUSH_NO_HOOK))
1062                         if (run_pre_push_hook(transport, remote_refs))
1063                                 return -1;
1064
1065                 if ((flags & (TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND |
1066                               TRANSPORT_RECURSE_SUBMODULES_ONLY)) &&
1067                     !is_bare_repository()) {
1068                         struct ref *ref = remote_refs;
1069                         struct oid_array commits = OID_ARRAY_INIT;
1070
1071                         for (; ref; ref = ref->next)
1072                                 if (!is_null_oid(&ref->new_oid))
1073                                         oid_array_append(&commits,
1074                                                           &ref->new_oid);
1075
1076                         if (!push_unpushed_submodules(&commits,
1077                                                       transport->remote,
1078                                                       refspec, refspec_nr,
1079                                                       transport->push_options,
1080                                                       pretend)) {
1081                                 oid_array_clear(&commits);
1082                                 die("Failed to push all needed submodules!");
1083                         }
1084                         oid_array_clear(&commits);
1085                 }
1086
1087                 if (((flags & TRANSPORT_RECURSE_SUBMODULES_CHECK) ||
1088                      ((flags & (TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND |
1089                                 TRANSPORT_RECURSE_SUBMODULES_ONLY)) &&
1090                       !pretend)) && !is_bare_repository()) {
1091                         struct ref *ref = remote_refs;
1092                         struct string_list needs_pushing = STRING_LIST_INIT_DUP;
1093                         struct oid_array commits = OID_ARRAY_INIT;
1094
1095                         for (; ref; ref = ref->next)
1096                                 if (!is_null_oid(&ref->new_oid))
1097                                         oid_array_append(&commits,
1098                                                           &ref->new_oid);
1099
1100                         if (find_unpushed_submodules(&commits, transport->remote->name,
1101                                                 &needs_pushing)) {
1102                                 oid_array_clear(&commits);
1103                                 die_with_unpushed_submodules(&needs_pushing);
1104                         }
1105                         string_list_clear(&needs_pushing, 0);
1106                         oid_array_clear(&commits);
1107                 }
1108
1109                 if (!(flags & TRANSPORT_RECURSE_SUBMODULES_ONLY))
1110                         push_ret = transport->vtable->push_refs(transport, remote_refs, flags);
1111                 else
1112                         push_ret = 0;
1113                 err = push_had_errors(remote_refs);
1114                 ret = push_ret | err;
1115
1116                 if (!quiet || err)
1117                         transport_print_push_status(transport->url, remote_refs,
1118                                         verbose | porcelain, porcelain,
1119                                         reject_reasons);
1120
1121                 if (flags & TRANSPORT_PUSH_SET_UPSTREAM)
1122                         set_upstreams(transport, remote_refs, pretend);
1123
1124                 if (!(flags & (TRANSPORT_PUSH_DRY_RUN |
1125                                TRANSPORT_RECURSE_SUBMODULES_ONLY))) {
1126                         struct ref *ref;
1127                         for (ref = remote_refs; ref; ref = ref->next)
1128                                 transport_update_tracking_ref(transport->remote, ref, verbose);
1129                 }
1130
1131                 if (porcelain && !push_ret)
1132                         puts("Done");
1133                 else if (!quiet && !ret && !transport_refs_pushed(remote_refs))
1134                         fprintf(stderr, "Everything up-to-date\n");
1135
1136                 return ret;
1137         }
1138         return 1;
1139 }
1140
1141 const struct ref *transport_get_remote_refs(struct transport *transport,
1142                                             const struct argv_array *ref_prefixes)
1143 {
1144         if (!transport->got_remote_refs) {
1145                 transport->remote_refs =
1146                         transport->vtable->get_refs_list(transport, 0,
1147                                                          ref_prefixes);
1148                 transport->got_remote_refs = 1;
1149         }
1150
1151         return transport->remote_refs;
1152 }
1153
1154 int transport_fetch_refs(struct transport *transport, struct ref *refs)
1155 {
1156         int rc;
1157         int nr_heads = 0, nr_alloc = 0, nr_refs = 0;
1158         struct ref **heads = NULL;
1159         struct ref *rm;
1160
1161         for (rm = refs; rm; rm = rm->next) {
1162                 nr_refs++;
1163                 if (rm->peer_ref &&
1164                     !is_null_oid(&rm->old_oid) &&
1165                     !oidcmp(&rm->peer_ref->old_oid, &rm->old_oid))
1166                         continue;
1167                 ALLOC_GROW(heads, nr_heads + 1, nr_alloc);
1168                 heads[nr_heads++] = rm;
1169         }
1170
1171         if (!nr_heads) {
1172                 /*
1173                  * When deepening of a shallow repository is requested,
1174                  * then local and remote refs are likely to still be equal.
1175                  * Just feed them all to the fetch method in that case.
1176                  * This condition shouldn't be met in a non-deepening fetch
1177                  * (see builtin/fetch.c:quickfetch()).
1178                  */
1179                 ALLOC_ARRAY(heads, nr_refs);
1180                 for (rm = refs; rm; rm = rm->next)
1181                         heads[nr_heads++] = rm;
1182         }
1183
1184         rc = transport->vtable->fetch(transport, nr_heads, heads);
1185
1186         free(heads);
1187         return rc;
1188 }
1189
1190 void transport_unlock_pack(struct transport *transport)
1191 {
1192         if (transport->pack_lockfile) {
1193                 unlink_or_warn(transport->pack_lockfile);
1194                 FREE_AND_NULL(transport->pack_lockfile);
1195         }
1196 }
1197
1198 int transport_connect(struct transport *transport, const char *name,
1199                       const char *exec, int fd[2])
1200 {
1201         if (transport->vtable->connect)
1202                 return transport->vtable->connect(transport, name, exec, fd);
1203         else
1204                 die("Operation not supported by protocol");
1205 }
1206
1207 int transport_disconnect(struct transport *transport)
1208 {
1209         int ret = 0;
1210         if (transport->vtable->disconnect)
1211                 ret = transport->vtable->disconnect(transport);
1212         free(transport);
1213         return ret;
1214 }
1215
1216 /*
1217  * Strip username (and password) from a URL and return
1218  * it in a newly allocated string.
1219  */
1220 char *transport_anonymize_url(const char *url)
1221 {
1222         char *scheme_prefix, *anon_part;
1223         size_t anon_len, prefix_len = 0;
1224
1225         anon_part = strchr(url, '@');
1226         if (url_is_local_not_ssh(url) || !anon_part)
1227                 goto literal_copy;
1228
1229         anon_len = strlen(++anon_part);
1230         scheme_prefix = strstr(url, "://");
1231         if (!scheme_prefix) {
1232                 if (!strchr(anon_part, ':'))
1233                         /* cannot be "me@there:/path/name" */
1234                         goto literal_copy;
1235         } else {
1236                 const char *cp;
1237                 /* make sure scheme is reasonable */
1238                 for (cp = url; cp < scheme_prefix; cp++) {
1239                         switch (*cp) {
1240                                 /* RFC 1738 2.1 */
1241                         case '+': case '.': case '-':
1242                                 break; /* ok */
1243                         default:
1244                                 if (isalnum(*cp))
1245                                         break;
1246                                 /* it isn't */
1247                                 goto literal_copy;
1248                         }
1249                 }
1250                 /* @ past the first slash does not count */
1251                 cp = strchr(scheme_prefix + 3, '/');
1252                 if (cp && cp < anon_part)
1253                         goto literal_copy;
1254                 prefix_len = scheme_prefix - url + 3;
1255         }
1256         return xstrfmt("%.*s%.*s", (int)prefix_len, url,
1257                        (int)anon_len, anon_part);
1258 literal_copy:
1259         return xstrdup(url);
1260 }
1261
1262 static void read_alternate_refs(const char *path,
1263                                 alternate_ref_fn *cb,
1264                                 void *data)
1265 {
1266         struct child_process cmd = CHILD_PROCESS_INIT;
1267         struct strbuf line = STRBUF_INIT;
1268         FILE *fh;
1269
1270         cmd.git_cmd = 1;
1271         argv_array_pushf(&cmd.args, "--git-dir=%s", path);
1272         argv_array_push(&cmd.args, "for-each-ref");
1273         argv_array_push(&cmd.args, "--format=%(objectname) %(refname)");
1274         cmd.env = local_repo_env;
1275         cmd.out = -1;
1276
1277         if (start_command(&cmd))
1278                 return;
1279
1280         fh = xfdopen(cmd.out, "r");
1281         while (strbuf_getline_lf(&line, fh) != EOF) {
1282                 struct object_id oid;
1283
1284                 if (get_oid_hex(line.buf, &oid) ||
1285                     line.buf[GIT_SHA1_HEXSZ] != ' ') {
1286                         warning("invalid line while parsing alternate refs: %s",
1287                                 line.buf);
1288                         break;
1289                 }
1290
1291                 cb(line.buf + GIT_SHA1_HEXSZ + 1, &oid, data);
1292         }
1293
1294         fclose(fh);
1295         finish_command(&cmd);
1296 }
1297
1298 struct alternate_refs_data {
1299         alternate_ref_fn *fn;
1300         void *data;
1301 };
1302
1303 static int refs_from_alternate_cb(struct alternate_object_database *e,
1304                                   void *data)
1305 {
1306         struct strbuf path = STRBUF_INIT;
1307         size_t base_len;
1308         struct alternate_refs_data *cb = data;
1309
1310         if (!strbuf_realpath(&path, e->path, 0))
1311                 goto out;
1312         if (!strbuf_strip_suffix(&path, "/objects"))
1313                 goto out;
1314         base_len = path.len;
1315
1316         /* Is this a git repository with refs? */
1317         strbuf_addstr(&path, "/refs");
1318         if (!is_directory(path.buf))
1319                 goto out;
1320         strbuf_setlen(&path, base_len);
1321
1322         read_alternate_refs(path.buf, cb->fn, cb->data);
1323
1324 out:
1325         strbuf_release(&path);
1326         return 0;
1327 }
1328
1329 void for_each_alternate_ref(alternate_ref_fn fn, void *data)
1330 {
1331         struct alternate_refs_data cb;
1332         cb.fn = fn;
1333         cb.data = data;
1334         foreach_alt_odb(refs_from_alternate_cb, &cb);
1335 }