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 "send-pack.h"
   7 #include "walker.h"
   8 #include "bundle.h"
   9 #include "dir.h"
  10 #include "refs.h"
  11 #include "branch.h"
  12 #include "url.h"
  13 #include "submodule.h"
  14
  15 /* rsync support */
  16
  17 /*
  18  * We copy packed-refs and refs/ into a temporary file, then read the
  19  * loose refs recursively (sorting whenever possible), and then inserting
  20  * those packed refs that are not yet in the list (not validating, but
  21  * assuming that the file is sorted).
  22  *
  23  * Appears refactoring this from refs.c is too cumbersome.
  24  */
  25
  26 static int str_cmp(const void *a, const void *b)
  27 {
  28         const char *s1 = a;
  29         const char *s2 = b;
  30
  31         return strcmp(s1, s2);
  32 }
  33
  34 /* path->buf + name_offset is expected to point to "refs/" */
  35
  36 static int read_loose_refs(struct strbuf *path, int name_offset,
  37                 struct ref **tail)
  38 {
  39         DIR *dir = opendir(path->buf);
  40         struct dirent *de;
  41         struct {
  42                 char **entries;
  43                 int nr, alloc;
  44         } list;
  45         int i, pathlen;
  46
  47         if (!dir)
  48                 return -1;
  49
  50         memset (&list, 0, sizeof(list));
  51
  52         while ((de = readdir(dir))) {
  53                 if (is_dot_or_dotdot(de->d_name))
  54                         continue;
  55                 ALLOC_GROW(list.entries, list.nr + 1, list.alloc);
  56                 list.entries[list.nr++] = xstrdup(de->d_name);
  57         }
  58         closedir(dir);
  59
  60         /* sort the list */
  61
  62         qsort(list.entries, list.nr, sizeof(char *), str_cmp);
  63
  64         pathlen = path->len;
  65         strbuf_addch(path, '/');
  66
  67         for (i = 0; i < list.nr; i++, strbuf_setlen(path, pathlen + 1)) {
  68                 strbuf_addstr(path, list.entries[i]);
  69                 if (read_loose_refs(path, name_offset, tail)) {
  70                         int fd = open(path->buf, O_RDONLY);
  71                         char buffer[40];
  72                         struct ref *next;
  73
  74                         if (fd < 0)
  75                                 continue;
  76                         next = alloc_ref(path->buf + name_offset);
  77                         if (read_in_full(fd, buffer, 40) != 40 ||
  78                                         get_sha1_hex(buffer, next->old_sha1)) {
  79                                 close(fd);
  80                                 free(next);
  81                                 continue;
  82                         }
  83                         close(fd);
  84                         (*tail)->next = next;
  85                         *tail = next;
  86                 }
  87         }
  88         strbuf_setlen(path, pathlen);
  89
  90         for (i = 0; i < list.nr; i++)
  91                 free(list.entries[i]);
  92         free(list.entries);
  93
  94         return 0;
  95 }
  96
  97 /* insert the packed refs for which no loose refs were found */
  98
  99 static void insert_packed_refs(const char *packed_refs, struct ref **list)
 100 {
 101         FILE *f = fopen(packed_refs, "r");
 102         static char buffer[PATH_MAX];
 103
 104         if (!f)
 105                 return;
 106
 107         for (;;) {
 108                 int cmp = cmp, len;
 109
 110                 if (!fgets(buffer, sizeof(buffer), f)) {
 111                         fclose(f);
 112                         return;
 113                 }
 114
 115                 if (hexval(buffer[0]) > 0xf)
 116                         continue;
 117                 len = strlen(buffer);
 118                 if (len && buffer[len - 1] == '\n')
 119                         buffer[--len] = '\0';
 120                 if (len < 41)
 121                         continue;
 122                 while ((*list)->next &&
 123                                 (cmp = strcmp(buffer + 41,
 124                                       (*list)->next->name)) > 0)
 125                         list = &(*list)->next;
 126                 if (!(*list)->next || cmp < 0) {
 127                         struct ref *next = alloc_ref(buffer + 41);
 128                         buffer[40] = '\0';
 129                         if (get_sha1_hex(buffer, next->old_sha1)) {
 130                                 warning ("invalid SHA-1: %s", buffer);
 131                                 free(next);
 132                                 continue;
 133                         }
 134                         next->next = (*list)->next;
 135                         (*list)->next = next;
 136                         list = &(*list)->next;
 137                 }
 138         }
 139 }
 140
 141 static void set_upstreams(struct transport *transport, struct ref *refs,
 142         int pretend)
 143 {
 144         struct ref *ref;
 145         for (ref = refs; ref; ref = ref->next) {
 146                 const char *localname;
 147                 const char *tmp;
 148                 const char *remotename;
 149                 unsigned char sha[20];
 150                 int flag = 0;
 151                 /*
 152                  * Check suitability for tracking. Must be successful /
 153                  * already up-to-date ref create/modify (not delete).
 154                  */
 155                 if (ref->status != REF_STATUS_OK &&
 156                         ref->status != REF_STATUS_UPTODATE)
 157                         continue;
 158                 if (!ref->peer_ref)
 159                         continue;
 160                 if (is_null_sha1(ref->new_sha1))
 161                         continue;
 162
 163                 /* Follow symbolic refs (mainly for HEAD). */
 164                 localname = ref->peer_ref->name;
 165                 remotename = ref->name;
 166                 tmp = resolve_ref(localname, sha, 1, &flag);
 167                 if (tmp && flag & REF_ISSYMREF &&
 168                         !prefixcmp(tmp, "refs/heads/"))
 169                         localname = tmp;
 170
 171                 /* Both source and destination must be local branches. */
 172                 if (!localname || prefixcmp(localname, "refs/heads/"))
 173                         continue;
 174                 if (!remotename || prefixcmp(remotename, "refs/heads/"))
 175                         continue;
 176
 177                 if (!pretend)
 178                         install_branch_config(BRANCH_CONFIG_VERBOSE,
 179                                 localname + 11, transport->remote->name,
 180                                 remotename);
 181                 else
 182                         printf("Would set upstream of '%s' to '%s' of '%s'\n",
 183                                 localname + 11, remotename + 11,
 184                                 transport->remote->name);
 185         }
 186 }
 187
 188 static const char *rsync_url(const char *url)
 189 {
 190         return prefixcmp(url, "rsync://") ? skip_prefix(url, "rsync:") : url;
 191 }
 192
 193 static struct ref *get_refs_via_rsync(struct transport *transport, int for_push)
 194 {
 195         struct strbuf buf = STRBUF_INIT, temp_dir = STRBUF_INIT;
 196         struct ref dummy = {NULL}, *tail = &dummy;
 197         struct child_process rsync;
 198         const char *args[5];
 199         int temp_dir_len;
 200
 201         if (for_push)
 202                 return NULL;
 203
 204         /* copy the refs to the temporary directory */
 205
 206         strbuf_addstr(&temp_dir, git_path("rsync-refs-XXXXXX"));
 207         if (!mkdtemp(temp_dir.buf))
 208                 die_errno ("Could not make temporary directory");
 209         temp_dir_len = temp_dir.len;
 210
 211         strbuf_addstr(&buf, rsync_url(transport->url));
 212         strbuf_addstr(&buf, "/refs");
 213
 214         memset(&rsync, 0, sizeof(rsync));
 215         rsync.argv = args;
 216         rsync.stdout_to_stderr = 1;
 217         args[0] = "rsync";
 218         args[1] = (transport->verbose > 0) ? "-rv" : "-r";
 219         args[2] = buf.buf;
 220         args[3] = temp_dir.buf;
 221         args[4] = NULL;
 222
 223         if (run_command(&rsync))
 224                 die ("Could not run rsync to get refs");
 225
 226         strbuf_reset(&buf);
 227         strbuf_addstr(&buf, rsync_url(transport->url));
 228         strbuf_addstr(&buf, "/packed-refs");
 229
 230         args[2] = buf.buf;
 231
 232         if (run_command(&rsync))
 233                 die ("Could not run rsync to get refs");
 234
 235         /* read the copied refs */
 236
 237         strbuf_addstr(&temp_dir, "/refs");
 238         read_loose_refs(&temp_dir, temp_dir_len + 1, &tail);
 239         strbuf_setlen(&temp_dir, temp_dir_len);
 240
 241         tail = &dummy;
 242         strbuf_addstr(&temp_dir, "/packed-refs");
 243         insert_packed_refs(temp_dir.buf, &tail);
 244         strbuf_setlen(&temp_dir, temp_dir_len);
 245
 246         if (remove_dir_recursively(&temp_dir, 0))
 247                 warning ("Error removing temporary directory %s.",
 248                                 temp_dir.buf);
 249
 250         strbuf_release(&buf);
 251         strbuf_release(&temp_dir);
 252
 253         return dummy.next;
 254 }
 255
 256 static int fetch_objs_via_rsync(struct transport *transport,
 257                                 int nr_objs, struct ref **to_fetch)
 258 {
 259         struct strbuf buf = STRBUF_INIT;
 260         struct child_process rsync;
 261         const char *args[8];
 262         int result;
 263
 264         strbuf_addstr(&buf, rsync_url(transport->url));
 265         strbuf_addstr(&buf, "/objects/");
 266
 267         memset(&rsync, 0, sizeof(rsync));
 268         rsync.argv = args;
 269         rsync.stdout_to_stderr = 1;
 270         args[0] = "rsync";
 271         args[1] = (transport->verbose > 0) ? "-rv" : "-r";
 272         args[2] = "--ignore-existing";
 273         args[3] = "--exclude";
 274         args[4] = "info";
 275         args[5] = buf.buf;
 276         args[6] = get_object_directory();
 277         args[7] = NULL;
 278
 279         /* NEEDSWORK: handle one level of alternates */
 280         result = run_command(&rsync);
 281
 282         strbuf_release(&buf);
 283
 284         return result;
 285 }
 286
 287 static int write_one_ref(const char *name, const unsigned char *sha1,
 288                 int flags, void *data)
 289 {
 290         struct strbuf *buf = data;
 291         int len = buf->len;
 292         FILE *f;
 293
 294         /* when called via for_each_ref(), flags is non-zero */
 295         if (flags && prefixcmp(name, "refs/heads/") &&
 296                         prefixcmp(name, "refs/tags/"))
 297                 return 0;
 298
 299         strbuf_addstr(buf, name);
 300         if (safe_create_leading_directories(buf->buf) ||
 301                         !(f = fopen(buf->buf, "w")) ||
 302                         fprintf(f, "%s\n", sha1_to_hex(sha1)) < 0 ||
 303                         fclose(f))
 304                 return error("problems writing temporary file %s", buf->buf);
 305         strbuf_setlen(buf, len);
 306         return 0;
 307 }
 308
 309 static int write_refs_to_temp_dir(struct strbuf *temp_dir,
 310                 int refspec_nr, const char **refspec)
 311 {
 312         int i;
 313
 314         for (i = 0; i < refspec_nr; i++) {
 315                 unsigned char sha1[20];
 316                 char *ref;
 317
 318                 if (dwim_ref(refspec[i], strlen(refspec[i]), sha1, &ref) != 1)
 319                         return error("Could not get ref %s", refspec[i]);
 320
 321                 if (write_one_ref(ref, sha1, 0, temp_dir)) {
 322                         free(ref);
 323                         return -1;
 324                 }
 325                 free(ref);
 326         }
 327         return 0;
 328 }
 329
 330 static int rsync_transport_push(struct transport *transport,
 331                 int refspec_nr, const char **refspec, int flags)
 332 {
 333         struct strbuf buf = STRBUF_INIT, temp_dir = STRBUF_INIT;
 334         int result = 0, i;
 335         struct child_process rsync;
 336         const char *args[10];
 337
 338         if (flags & TRANSPORT_PUSH_MIRROR)
 339                 return error("rsync transport does not support mirror mode");
 340
 341         /* first push the objects */
 342
 343         strbuf_addstr(&buf, rsync_url(transport->url));
 344         strbuf_addch(&buf, '/');
 345
 346         memset(&rsync, 0, sizeof(rsync));
 347         rsync.argv = args;
 348         rsync.stdout_to_stderr = 1;
 349         i = 0;
 350         args[i++] = "rsync";
 351         args[i++] = "-a";
 352         if (flags & TRANSPORT_PUSH_DRY_RUN)
 353                 args[i++] = "--dry-run";
 354         if (transport->verbose > 0)
 355                 args[i++] = "-v";
 356         args[i++] = "--ignore-existing";
 357         args[i++] = "--exclude";
 358         args[i++] = "info";
 359         args[i++] = get_object_directory();
 360         args[i++] = buf.buf;
 361         args[i++] = NULL;
 362
 363         if (run_command(&rsync))
 364                 return error("Could not push objects to %s",
 365                                 rsync_url(transport->url));
 366
 367         /* copy the refs to the temporary directory; they could be packed. */
 368
 369         strbuf_addstr(&temp_dir, git_path("rsync-refs-XXXXXX"));
 370         if (!mkdtemp(temp_dir.buf))
 371                 die_errno ("Could not make temporary directory");
 372         strbuf_addch(&temp_dir, '/');
 373
 374         if (flags & TRANSPORT_PUSH_ALL) {
 375                 if (for_each_ref(write_one_ref, &temp_dir))
 376                         return -1;
 377         } else if (write_refs_to_temp_dir(&temp_dir, refspec_nr, refspec))
 378                 return -1;
 379
 380         i = 2;
 381         if (flags & TRANSPORT_PUSH_DRY_RUN)
 382                 args[i++] = "--dry-run";
 383         if (!(flags & TRANSPORT_PUSH_FORCE))
 384                 args[i++] = "--ignore-existing";
 385         args[i++] = temp_dir.buf;
 386         args[i++] = rsync_url(transport->url);
 387         args[i++] = NULL;
 388         if (run_command(&rsync))
 389                 result = error("Could not push to %s",
 390                                 rsync_url(transport->url));
 391
 392         if (remove_dir_recursively(&temp_dir, 0))
 393                 warning ("Could not remove temporary directory %s.",
 394                                 temp_dir.buf);
 395
 396         strbuf_release(&buf);
 397         strbuf_release(&temp_dir);
 398
 399         return result;
 400 }
 401
 402 struct bundle_transport_data {
 403         int fd;
 404         struct bundle_header header;
 405 };
 406
 407 static struct ref *get_refs_from_bundle(struct transport *transport, int for_push)
 408 {
 409         struct bundle_transport_data *data = transport->data;
 410         struct ref *result = NULL;
 411         int i;
 412
 413         if (for_push)
 414                 return NULL;
 415
 416         if (data->fd > 0)
 417                 close(data->fd);
 418         data->fd = read_bundle_header(transport->url, &data->header);
 419         if (data->fd < 0)
 420                 die ("Could not read bundle '%s'.", transport->url);
 421         for (i = 0; i < data->header.references.nr; i++) {
 422                 struct ref_list_entry *e = data->header.references.list + i;
 423                 struct ref *ref = alloc_ref(e->name);
 424                 hashcpy(ref->old_sha1, e->sha1);
 425                 ref->next = result;
 426                 result = ref;
 427         }
 428         return result;
 429 }
 430
 431 static int fetch_refs_from_bundle(struct transport *transport,
 432                                int nr_heads, struct ref **to_fetch)
 433 {
 434         struct bundle_transport_data *data = transport->data;
 435         return unbundle(&data->header, data->fd);
 436 }
 437
 438 static int close_bundle(struct transport *transport)
 439 {
 440         struct bundle_transport_data *data = transport->data;
 441         if (data->fd > 0)
 442                 close(data->fd);
 443         free(data);
 444         return 0;
 445 }
 446
 447 struct git_transport_data {
 448         struct git_transport_options options;
 449         struct child_process *conn;
 450         int fd[2];
 451         unsigned got_remote_heads : 1;
 452         struct extra_have_objects extra_have;
 453 };
 454
 455 static int set_git_option(struct git_transport_options *opts,
 456                           const char *name, const char *value)
 457 {
 458         if (!strcmp(name, TRANS_OPT_UPLOADPACK)) {
 459                 opts->uploadpack = value;
 460                 return 0;
 461         } else if (!strcmp(name, TRANS_OPT_RECEIVEPACK)) {
 462                 opts->receivepack = value;
 463                 return 0;
 464         } else if (!strcmp(name, TRANS_OPT_THIN)) {
 465                 opts->thin = !!value;
 466                 return 0;
 467         } else if (!strcmp(name, TRANS_OPT_FOLLOWTAGS)) {
 468                 opts->followtags = !!value;
 469                 return 0;
 470         } else if (!strcmp(name, TRANS_OPT_KEEP)) {
 471                 opts->keep = !!value;
 472                 return 0;
 473         } else if (!strcmp(name, TRANS_OPT_DEPTH)) {
 474                 if (!value)
 475                         opts->depth = 0;
 476                 else
 477                         opts->depth = atoi(value);
 478                 return 0;
 479         }
 480         return 1;
 481 }
 482
 483 static int connect_setup(struct transport *transport, int for_push, int verbose)
 484 {
 485         struct git_transport_data *data = transport->data;
 486         struct strbuf sb = STRBUF_INIT;
 487
 488         if (data->conn)
 489                 return 0;
 490
 491         strbuf_addstr(&sb, for_push ? data->options.receivepack :
 492                                  data->options.uploadpack);
 493         if (for_push && transport->verbose < 0)
 494                 strbuf_addstr(&sb, " --quiet");
 495         data->conn = git_connect(data->fd, transport->url, sb.buf,
 496                                  verbose ? CONNECT_VERBOSE : 0);
 497         strbuf_release(&sb);
 498
 499         return 0;
 500 }
 501
 502 static struct ref *get_refs_via_connect(struct transport *transport, int for_push)
 503 {
 504         struct git_transport_data *data = transport->data;
 505         struct ref *refs;
 506
 507         connect_setup(transport, for_push, 0);
 508         get_remote_heads(data->fd[0], &refs, 0, NULL,
 509                          for_push ? REF_NORMAL : 0, &data->extra_have);
 510         data->got_remote_heads = 1;
 511
 512         return refs;
 513 }
 514
 515 static int fetch_refs_via_pack(struct transport *transport,
 516                                int nr_heads, struct ref **to_fetch)
 517 {
 518         struct git_transport_data *data = transport->data;
 519         char **heads = xmalloc(nr_heads * sizeof(*heads));
 520         char **origh = xmalloc(nr_heads * sizeof(*origh));
 521         const struct ref *refs;
 522         char *dest = xstrdup(transport->url);
 523         struct fetch_pack_args args;
 524         int i;
 525         struct ref *refs_tmp = NULL;
 526
 527         memset(&args, 0, sizeof(args));
 528         args.uploadpack = data->options.uploadpack;
 529         args.keep_pack = data->options.keep;
 530         args.lock_pack = 1;
 531         args.use_thin_pack = data->options.thin;
 532         args.include_tag = data->options.followtags;
 533         args.verbose = (transport->verbose > 0);
 534         args.quiet = (transport->verbose < 0);
 535         args.no_progress = !transport->progress;
 536         args.depth = data->options.depth;
 537
 538         for (i = 0; i < nr_heads; i++)
 539                 origh[i] = heads[i] = xstrdup(to_fetch[i]->name);
 540
 541         if (!data->got_remote_heads) {
 542                 connect_setup(transport, 0, 0);
 543                 get_remote_heads(data->fd[0], &refs_tmp, 0, NULL, 0, NULL);
 544                 data->got_remote_heads = 1;
 545         }
 546
 547         refs = fetch_pack(&args, data->fd, data->conn,
 548                           refs_tmp ? refs_tmp : transport->remote_refs,
 549                           dest, nr_heads, heads, &transport->pack_lockfile);
 550         close(data->fd[0]);
 551         close(data->fd[1]);
 552         if (finish_connect(data->conn))
 553                 refs = NULL;
 554         data->conn = NULL;
 555         data->got_remote_heads = 0;
 556
 557         free_refs(refs_tmp);
 558
 559         for (i = 0; i < nr_heads; i++)
 560                 free(origh[i]);
 561         free(origh);
 562         free(heads);
 563         free(dest);
 564         return (refs ? 0 : -1);
 565 }
 566
 567 static int push_had_errors(struct ref *ref)
 568 {
 569         for (; ref; ref = ref->next) {
 570                 switch (ref->status) {
 571                 case REF_STATUS_NONE:
 572                 case REF_STATUS_UPTODATE:
 573                 case REF_STATUS_OK:
 574                         break;
 575                 default:
 576                         return 1;
 577                 }
 578         }
 579         return 0;
 580 }
 581
 582 int transport_refs_pushed(struct ref *ref)
 583 {
 584         for (; ref; ref = ref->next) {
 585                 switch(ref->status) {
 586                 case REF_STATUS_NONE:
 587                 case REF_STATUS_UPTODATE:
 588                         break;
 589                 default:
 590                         return 1;
 591                 }
 592         }
 593         return 0;
 594 }
 595
 596 void transport_update_tracking_ref(struct remote *remote, struct ref *ref, int verbose)
 597 {
 598         struct refspec rs;
 599
 600         if (ref->status != REF_STATUS_OK && ref->status != REF_STATUS_UPTODATE)
 601                 return;
 602
 603         rs.src = ref->name;
 604         rs.dst = NULL;
 605
 606         if (!remote_find_tracking(remote, &rs)) {
 607                 if (verbose)
 608                         fprintf(stderr, "updating local tracking ref '%s'\n", rs.dst);
 609                 if (ref->deletion) {
 610                         delete_ref(rs.dst, NULL, 0);
 611                 } else
 612                         update_ref("update by push", rs.dst,
 613                                         ref->new_sha1, NULL, 0, 0);
 614                 free(rs.dst);
 615         }
 616 }
 617
 618 static void print_ref_status(char flag, const char *summary, struct ref *to, struct ref *from, const char *msg, int porcelain)
 619 {
 620         if (porcelain) {
 621                 if (from)
 622                         fprintf(stdout, "%c\t%s:%s\t", flag, from->name, to->name);
 623                 else
 624                         fprintf(stdout, "%c\t:%s\t", flag, to->name);
 625                 if (msg)
 626                         fprintf(stdout, "%s (%s)\n", summary, msg);
 627                 else
 628                         fprintf(stdout, "%s\n", summary);
 629         } else {
 630                 fprintf(stderr, " %c %-*s ", flag, TRANSPORT_SUMMARY_WIDTH, summary);
 631                 if (from)
 632                         fprintf(stderr, "%s -> %s", prettify_refname(from->name), prettify_refname(to->name));
 633                 else
 634                         fputs(prettify_refname(to->name), stderr);
 635                 if (msg) {
 636                         fputs(" (", stderr);
 637                         fputs(msg, stderr);
 638                         fputc(')', stderr);
 639                 }
 640                 fputc('\n', stderr);
 641         }
 642 }
 643
 644 static const char *status_abbrev(unsigned char sha1[20])
 645 {
 646         return find_unique_abbrev(sha1, DEFAULT_ABBREV);
 647 }
 648
 649 static void print_ok_ref_status(struct ref *ref, int porcelain)
 650 {
 651         if (ref->deletion)
 652                 print_ref_status('-', "[deleted]", ref, NULL, NULL, porcelain);
 653         else if (is_null_sha1(ref->old_sha1))
 654                 print_ref_status('*',
 655                         (!prefixcmp(ref->name, "refs/tags/") ? "[new tag]" :
 656                         "[new branch]"),
 657                         ref, ref->peer_ref, NULL, porcelain);
 658         else {
 659                 char quickref[84];
 660                 char type;
 661                 const char *msg;
 662
 663                 strcpy(quickref, status_abbrev(ref->old_sha1));
 664                 if (ref->nonfastforward) {
 665                         strcat(quickref, "...");
 666                         type = '+';
 667                         msg = "forced update";
 668                 } else {
 669                         strcat(quickref, "..");
 670                         type = ' ';
 671                         msg = NULL;
 672                 }
 673                 strcat(quickref, status_abbrev(ref->new_sha1));
 674
 675                 print_ref_status(type, quickref, ref, ref->peer_ref, msg, porcelain);
 676         }
 677 }
 678
 679 static int print_one_push_status(struct ref *ref, const char *dest, int count, int porcelain)
 680 {
 681         if (!count)
 682                 fprintf(porcelain ? stdout : stderr, "To %s\n", dest);
 683
 684         switch(ref->status) {
 685         case REF_STATUS_NONE:
 686                 print_ref_status('X', "[no match]", ref, NULL, NULL, porcelain);
 687                 break;
 688         case REF_STATUS_REJECT_NODELETE:
 689                 print_ref_status('!', "[rejected]", ref, NULL,
 690                                                  "remote does not support deleting refs", porcelain);
 691                 break;
 692         case REF_STATUS_UPTODATE:
 693                 print_ref_status('=', "[up to date]", ref,
 694                                                  ref->peer_ref, NULL, porcelain);
 695                 break;
 696         case REF_STATUS_REJECT_NONFASTFORWARD:
 697                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 698                                                  "non-fast-forward", porcelain);
 699                 break;
 700         case REF_STATUS_REMOTE_REJECT:
 701                 print_ref_status('!', "[remote rejected]", ref,
 702                                                  ref->deletion ? NULL : ref->peer_ref,
 703                                                  ref->remote_status, porcelain);
 704                 break;
 705         case REF_STATUS_EXPECTING_REPORT:
 706                 print_ref_status('!', "[remote failure]", ref,
 707                                                  ref->deletion ? NULL : ref->peer_ref,
 708                                                  "remote failed to report status", porcelain);
 709                 break;
 710         case REF_STATUS_OK:
 711                 print_ok_ref_status(ref, porcelain);
 712                 break;
 713         }
 714
 715         return 1;
 716 }
 717
 718 void transport_print_push_status(const char *dest, struct ref *refs,
 719                                   int verbose, int porcelain, int *nonfastforward)
 720 {
 721         struct ref *ref;
 722         int n = 0;
 723
 724         if (verbose) {
 725                 for (ref = refs; ref; ref = ref->next)
 726                         if (ref->status == REF_STATUS_UPTODATE)
 727                                 n += print_one_push_status(ref, dest, n, porcelain);
 728         }
 729
 730         for (ref = refs; ref; ref = ref->next)
 731                 if (ref->status == REF_STATUS_OK)
 732                         n += print_one_push_status(ref, dest, n, porcelain);
 733
 734         *nonfastforward = 0;
 735         for (ref = refs; ref; ref = ref->next) {
 736                 if (ref->status != REF_STATUS_NONE &&
 737                     ref->status != REF_STATUS_UPTODATE &&
 738                     ref->status != REF_STATUS_OK)
 739                         n += print_one_push_status(ref, dest, n, porcelain);
 740                 if (ref->status == REF_STATUS_REJECT_NONFASTFORWARD)
 741                         *nonfastforward = 1;
 742         }
 743 }
 744
 745 void transport_verify_remote_names(int nr_heads, const char **heads)
 746 {
 747         int i;
 748
 749         for (i = 0; i < nr_heads; i++) {
 750                 const char *local = heads[i];
 751                 const char *remote = strrchr(heads[i], ':');
 752
 753                 if (*local == '+')
 754                         local++;
 755
 756                 /* A matching refspec is okay.  */
 757                 if (remote == local && remote[1] == '\0')
 758                         continue;
 759
 760                 remote = remote ? (remote + 1) : local;
 761                 switch (check_ref_format(remote)) {
 762                 case 0: /* ok */
 763                 case CHECK_REF_FORMAT_ONELEVEL:
 764                         /* ok but a single level -- that is fine for
 765                          * a match pattern.
 766                          */
 767                 case CHECK_REF_FORMAT_WILDCARD:
 768                         /* ok but ends with a pattern-match character */
 769                         continue;
 770                 }
 771                 die("remote part of refspec is not a valid name in %s",
 772                     heads[i]);
 773         }
 774 }
 775
 776 static int git_transport_push(struct transport *transport, struct ref *remote_refs, int flags)
 777 {
 778         struct git_transport_data *data = transport->data;
 779         struct send_pack_args args;
 780         int ret;
 781
 782         if (!data->got_remote_heads) {
 783                 struct ref *tmp_refs;
 784                 connect_setup(transport, 1, 0);
 785
 786                 get_remote_heads(data->fd[0], &tmp_refs, 0, NULL, REF_NORMAL,
 787                                  NULL);
 788                 data->got_remote_heads = 1;
 789         }
 790
 791         memset(&args, 0, sizeof(args));
 792         args.send_mirror = !!(flags & TRANSPORT_PUSH_MIRROR);
 793         args.force_update = !!(flags & TRANSPORT_PUSH_FORCE);
 794         args.use_thin_pack = data->options.thin;
 795         args.verbose = (transport->verbose > 0);
 796         args.quiet = (transport->verbose < 0);
 797         args.progress = transport->progress;
 798         args.dry_run = !!(flags & TRANSPORT_PUSH_DRY_RUN);
 799         args.porcelain = !!(flags & TRANSPORT_PUSH_PORCELAIN);
 800
 801         ret = send_pack(&args, data->fd, data->conn, remote_refs,
 802                         &data->extra_have);
 803
 804         close(data->fd[1]);
 805         close(data->fd[0]);
 806         ret |= finish_connect(data->conn);
 807         data->conn = NULL;
 808         data->got_remote_heads = 0;
 809
 810         return ret;
 811 }
 812
 813 static int connect_git(struct transport *transport, const char *name,
 814                        const char *executable, int fd[2])
 815 {
 816         struct git_transport_data *data = transport->data;
 817         data->conn = git_connect(data->fd, transport->url,
 818                                  executable, 0);
 819         fd[0] = data->fd[0];
 820         fd[1] = data->fd[1];
 821         return 0;
 822 }
 823
 824 static int disconnect_git(struct transport *transport)
 825 {
 826         struct git_transport_data *data = transport->data;
 827         if (data->conn) {
 828                 if (data->got_remote_heads)
 829                         packet_flush(data->fd[1]);
 830                 close(data->fd[0]);
 831                 close(data->fd[1]);
 832                 finish_connect(data->conn);
 833         }
 834
 835         free(data);
 836         return 0;
 837 }
 838
 839 void transport_take_over(struct transport *transport,
 840                          struct child_process *child)
 841 {
 842         struct git_transport_data *data;
 843
 844         if (!transport->smart_options)
 845                 die("Bug detected: Taking over transport requires non-NULL "
 846                     "smart_options field.");
 847
 848         data = xcalloc(1, sizeof(*data));
 849         data->options = *transport->smart_options;
 850         data->conn = child;
 851         data->fd[0] = data->conn->out;
 852         data->fd[1] = data->conn->in;
 853         data->got_remote_heads = 0;
 854         transport->data = data;
 855
 856         transport->set_option = NULL;
 857         transport->get_refs_list = get_refs_via_connect;
 858         transport->fetch = fetch_refs_via_pack;
 859         transport->push = NULL;
 860         transport->push_refs = git_transport_push;
 861         transport->disconnect = disconnect_git;
 862         transport->smart_options = &(data->options);
 863 }
 864
 865 static int is_local(const char *url)
 866 {
 867         const char *colon = strchr(url, ':');
 868         const char *slash = strchr(url, '/');
 869         return !colon || (slash && slash < colon) ||
 870                 has_dos_drive_prefix(url);
 871 }
 872
 873 static int is_file(const char *url)
 874 {
 875         struct stat buf;
 876         if (stat(url, &buf))
 877                 return 0;
 878         return S_ISREG(buf.st_mode);
 879 }
 880
 881 static int external_specification_len(const char *url)
 882 {
 883         return strchr(url, ':') - url;
 884 }
 885
 886 struct transport *transport_get(struct remote *remote, const char *url)
 887 {
 888         const char *helper;
 889         struct transport *ret = xcalloc(1, sizeof(*ret));
 890
 891         ret->progress = isatty(2);
 892
 893         if (!remote)
 894                 die("No remote provided to transport_get()");
 895
 896         ret->got_remote_refs = 0;
 897         ret->remote = remote;
 898         helper = remote->foreign_vcs;
 899
 900         if (!url && remote->url)
 901                 url = remote->url[0];
 902         ret->url = url;
 903
 904         /* maybe it is a foreign URL? */
 905         if (url) {
 906                 const char *p = url;
 907
 908                 while (is_urlschemechar(p == url, *p))
 909                         p++;
 910                 if (!prefixcmp(p, "::"))
 911                         helper = xstrndup(url, p - url);
 912         }
 913
 914         if (helper) {
 915                 transport_helper_init(ret, helper);
 916         } else if (!prefixcmp(url, "rsync:")) {
 917                 ret->get_refs_list = get_refs_via_rsync;
 918                 ret->fetch = fetch_objs_via_rsync;
 919                 ret->push = rsync_transport_push;
 920                 ret->smart_options = NULL;
 921         } else if (is_local(url) && is_file(url)) {
 922                 struct bundle_transport_data *data = xcalloc(1, sizeof(*data));
 923                 ret->data = data;
 924                 ret->get_refs_list = get_refs_from_bundle;
 925                 ret->fetch = fetch_refs_from_bundle;
 926                 ret->disconnect = close_bundle;
 927                 ret->smart_options = NULL;
 928         } else if (!is_url(url)
 929                 || !prefixcmp(url, "file://")
 930                 || !prefixcmp(url, "git://")
 931                 || !prefixcmp(url, "ssh://")
 932                 || !prefixcmp(url, "git+ssh://")
 933                 || !prefixcmp(url, "ssh+git://")) {
 934                 /* These are builtin smart transports. */
 935                 struct git_transport_data *data = xcalloc(1, sizeof(*data));
 936                 ret->data = data;
 937                 ret->set_option = NULL;
 938                 ret->get_refs_list = get_refs_via_connect;
 939                 ret->fetch = fetch_refs_via_pack;
 940                 ret->push_refs = git_transport_push;
 941                 ret->connect = connect_git;
 942                 ret->disconnect = disconnect_git;
 943                 ret->smart_options = &(data->options);
 944
 945                 data->conn = NULL;
 946                 data->got_remote_heads = 0;
 947         } else {
 948                 /* Unknown protocol in URL. Pass to external handler. */
 949                 int len = external_specification_len(url);
 950                 char *handler = xmalloc(len + 1);
 951                 handler[len] = 0;
 952                 strncpy(handler, url, len);
 953                 transport_helper_init(ret, handler);
 954         }
 955
 956         if (ret->smart_options) {
 957                 ret->smart_options->thin = 1;
 958                 ret->smart_options->uploadpack = "git-upload-pack";
 959                 if (remote->uploadpack)
 960                         ret->smart_options->uploadpack = remote->uploadpack;
 961                 ret->smart_options->receivepack = "git-receive-pack";
 962                 if (remote->receivepack)
 963                         ret->smart_options->receivepack = remote->receivepack;
 964         }
 965
 966         return ret;
 967 }
 968
 969 int transport_set_option(struct transport *transport,
 970                          const char *name, const char *value)
 971 {
 972         int git_reports = 1, protocol_reports = 1;
 973
 974         if (transport->smart_options)
 975                 git_reports = set_git_option(transport->smart_options,
 976                                              name, value);
 977
 978         if (transport->set_option)
 979                 protocol_reports = transport->set_option(transport, name,
 980                                                         value);
 981
 982         /* If either report is 0, report 0 (success). */
 983         if (!git_reports || !protocol_reports)
 984                 return 0;
 985         /* If either reports -1 (invalid value), report -1. */
 986         if ((git_reports == -1) || (protocol_reports == -1))
 987                 return -1;
 988         /* Otherwise if both report unknown, report unknown. */
 989         return 1;
 990 }
 991
 992 void transport_set_verbosity(struct transport *transport, int verbosity,
 993         int force_progress)
 994 {
 995         if (verbosity >= 2)
 996                 transport->verbose = verbosity <= 3 ? verbosity : 3;
 997         if (verbosity < 0)
 998                 transport->verbose = -1;
 999
1000         /**
1001          * Rules used to determine whether to report progress (processing aborts
1002          * when a rule is satisfied):
1003          *
1004          *   1. Report progress, if force_progress is 1 (ie. --progress).
1005          *   2. Don't report progress, if verbosity < 0 (ie. -q/--quiet ).
1006          *   3. Report progress if isatty(2) is 1.
1007          **/
1008         transport->progress = force_progress || (verbosity >= 0 && isatty(2));
1009 }
1010
1011 int transport_push(struct transport *transport,
1012                    int refspec_nr, const char **refspec, int flags,
1013                    int *nonfastforward)
1014 {
1015         *nonfastforward = 0;
1016         transport_verify_remote_names(refspec_nr, refspec);
1017
1018         if (transport->push) {
1019                 /* Maybe FIXME. But no important transport uses this case. */
1020                 if (flags & TRANSPORT_PUSH_SET_UPSTREAM)
1021                         die("This transport does not support using --set-upstream");
1022
1023                 return transport->push(transport, refspec_nr, refspec, flags);
1024         } else if (transport->push_refs) {
1025                 struct ref *remote_refs =
1026                         transport->get_refs_list(transport, 1);
1027                 struct ref *local_refs = get_local_heads();
1028                 int match_flags = MATCH_REFS_NONE;
1029                 int verbose = (transport->verbose > 0);
1030                 int quiet = (transport->verbose < 0);
1031                 int porcelain = flags & TRANSPORT_PUSH_PORCELAIN;
1032                 int pretend = flags & TRANSPORT_PUSH_DRY_RUN;
1033                 int push_ret, ret, err;
1034
1035                 if (flags & TRANSPORT_PUSH_ALL)
1036                         match_flags |= MATCH_REFS_ALL;
1037                 if (flags & TRANSPORT_PUSH_MIRROR)
1038                         match_flags |= MATCH_REFS_MIRROR;
1039
1040                 if (match_refs(local_refs, &remote_refs,
1041                                refspec_nr, refspec, match_flags)) {
1042                         return -1;
1043                 }
1044
1045                 set_ref_status_for_push(remote_refs,
1046                         flags & TRANSPORT_PUSH_MIRROR,
1047                         flags & TRANSPORT_PUSH_FORCE);
1048
1049                 if ((flags & TRANSPORT_RECURSE_SUBMODULES_CHECK) && !is_bare_repository()) {
1050                         struct ref *ref = remote_refs;
1051                         for (; ref; ref = ref->next)
1052                                 if (!is_null_sha1(ref->new_sha1) &&
1053                                     check_submodule_needs_pushing(ref->new_sha1,transport->remote->name))
1054                                         die("There are unpushed submodules, aborting.");
1055                 }
1056
1057                 push_ret = transport->push_refs(transport, remote_refs, flags);
1058                 err = push_had_errors(remote_refs);
1059                 ret = push_ret | err;
1060
1061                 if (!quiet || err)
1062                         transport_print_push_status(transport->url, remote_refs,
1063                                         verbose | porcelain, porcelain,
1064                                         nonfastforward);
1065
1066                 if (flags & TRANSPORT_PUSH_SET_UPSTREAM)
1067                         set_upstreams(transport, remote_refs, pretend);
1068
1069                 if (!(flags & TRANSPORT_PUSH_DRY_RUN)) {
1070                         struct ref *ref;
1071                         for (ref = remote_refs; ref; ref = ref->next)
1072                                 transport_update_tracking_ref(transport->remote, ref, verbose);
1073                 }
1074
1075                 if (porcelain && !push_ret)
1076                         puts("Done");
1077                 else if (!quiet && !ret && !transport_refs_pushed(remote_refs))
1078                         fprintf(stderr, "Everything up-to-date\n");
1079
1080                 return ret;
1081         }
1082         return 1;
1083 }
1084
1085 const struct ref *transport_get_remote_refs(struct transport *transport)
1086 {
1087         if (!transport->got_remote_refs) {
1088                 transport->remote_refs = transport->get_refs_list(transport, 0);
1089                 transport->got_remote_refs = 1;
1090         }
1091
1092         return transport->remote_refs;
1093 }
1094
1095 int transport_fetch_refs(struct transport *transport, struct ref *refs)
1096 {
1097         int rc;
1098         int nr_heads = 0, nr_alloc = 0, nr_refs = 0;
1099         struct ref **heads = NULL;
1100         struct ref *rm;
1101
1102         for (rm = refs; rm; rm = rm->next) {
1103                 nr_refs++;
1104                 if (rm->peer_ref &&
1105                     !is_null_sha1(rm->old_sha1) &&
1106                     !hashcmp(rm->peer_ref->old_sha1, rm->old_sha1))
1107                         continue;
1108                 ALLOC_GROW(heads, nr_heads + 1, nr_alloc);
1109                 heads[nr_heads++] = rm;
1110         }
1111
1112         if (!nr_heads) {
1113                 /*
1114                  * When deepening of a shallow repository is requested,
1115                  * then local and remote refs are likely to still be equal.
1116                  * Just feed them all to the fetch method in that case.
1117                  * This condition shouldn't be met in a non-deepening fetch
1118                  * (see builtin-fetch.c:quickfetch()).
1119                  */
1120                 heads = xmalloc(nr_refs * sizeof(*heads));
1121                 for (rm = refs; rm; rm = rm->next)
1122                         heads[nr_heads++] = rm;
1123         }
1124
1125         rc = transport->fetch(transport, nr_heads, heads);
1126
1127         free(heads);
1128         return rc;
1129 }
1130
1131 void transport_unlock_pack(struct transport *transport)
1132 {
1133         if (transport->pack_lockfile) {
1134                 unlink_or_warn(transport->pack_lockfile);
1135                 free(transport->pack_lockfile);
1136                 transport->pack_lockfile = NULL;
1137         }
1138 }
1139
1140 int transport_connect(struct transport *transport, const char *name,
1141                       const char *exec, int fd[2])
1142 {
1143         if (transport->connect)
1144                 return transport->connect(transport, name, exec, fd);
1145         else
1146                 die("Operation not supported by protocol");
1147 }
1148
1149 int transport_disconnect(struct transport *transport)
1150 {
1151         int ret = 0;
1152         if (transport->disconnect)
1153                 ret = transport->disconnect(transport);
1154         free(transport);
1155         return ret;
1156 }
1157
1158 /*
1159  * Strip username (and password) from an url and return
1160  * it in a newly allocated string.
1161  */
1162 char *transport_anonymize_url(const char *url)
1163 {
1164         char *anon_url, *scheme_prefix, *anon_part;
1165         size_t anon_len, prefix_len = 0;
1166
1167         anon_part = strchr(url, '@');
1168         if (is_local(url) || !anon_part)
1169                 goto literal_copy;
1170
1171         anon_len = strlen(++anon_part);
1172         scheme_prefix = strstr(url, "://");
1173         if (!scheme_prefix) {
1174                 if (!strchr(anon_part, ':'))
1175                         /* cannot be "me@there:/path/name" */
1176                         goto literal_copy;
1177         } else {
1178                 const char *cp;
1179                 /* make sure scheme is reasonable */
1180                 for (cp = url; cp < scheme_prefix; cp++) {
1181                         switch (*cp) {
1182                                 /* RFC 1738 2.1 */
1183                         case '+': case '.': case '-':
1184                                 break; /* ok */
1185                         default:
1186                                 if (isalnum(*cp))
1187                                         break;
1188                                 /* it isn't */
1189                                 goto literal_copy;
1190                         }
1191                 }
1192                 /* @ past the first slash does not count */
1193                 cp = strchr(scheme_prefix + 3, '/');
1194                 if (cp && cp < anon_part)
1195                         goto literal_copy;
1196                 prefix_len = scheme_prefix - url + 3;
1197         }
1198         anon_url = xcalloc(1, 1 + prefix_len + anon_len);
1199         memcpy(anon_url, url, prefix_len);
1200         memcpy(anon_url + prefix_len, anon_part, anon_len);
1201         return anon_url;
1202 literal_copy:
1203         return xstrdup(url);
1204 }
1205
1206 struct alternate_refs_data {
1207         alternate_ref_fn *fn;
1208         void *data;
1209 };
1210
1211 static int refs_from_alternate_cb(struct alternate_object_database *e,
1212                                   void *data)
1213 {
1214         char *other;
1215         size_t len;
1216         struct remote *remote;
1217         struct transport *transport;
1218         const struct ref *extra;
1219         struct alternate_refs_data *cb = data;
1220
1221         e->name[-1] = '\0';
1222         other = xstrdup(real_path(e->base));
1223         e->name[-1] = '/';
1224         len = strlen(other);
1225
1226         while (other[len-1] == '/')
1227                 other[--len] = '\0';
1228         if (len < 8 || memcmp(other + len - 8, "/objects", 8))
1229                 return 0;
1230         /* Is this a git repository with refs? */
1231         memcpy(other + len - 8, "/refs", 6);
1232         if (!is_directory(other))
1233                 return 0;
1234         other[len - 8] = '\0';
1235         remote = remote_get(other);
1236         transport = transport_get(remote, other);
1237         for (extra = transport_get_remote_refs(transport);
1238              extra;
1239              extra = extra->next)
1240                 cb->fn(extra, cb->data);
1241         transport_disconnect(transport);
1242         free(other);
1243         return 0;
1244 }
1245
1246 void for_each_alternate_ref(alternate_ref_fn fn, void *data)
1247 {
1248         struct alternate_refs_data cb;
1249         cb.fn = fn;
1250         cb.data = data;
1251         foreach_alt_odb(refs_from_alternate_cb, &cb);
1252 }