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
 487         if (data->conn)
 488                 return 0;
 489
 490         data->conn = git_connect(data->fd, transport->url,
 491                                  for_push ? data->options.receivepack :
 492                                  data->options.uploadpack,
 493                                  verbose ? CONNECT_VERBOSE : 0);
 494
 495         return 0;
 496 }
 497
 498 static struct ref *get_refs_via_connect(struct transport *transport, int for_push)
 499 {
 500         struct git_transport_data *data = transport->data;
 501         struct ref *refs;
 502
 503         connect_setup(transport, for_push, 0);
 504         get_remote_heads(data->fd[0], &refs, 0, NULL,
 505                          for_push ? REF_NORMAL : 0, &data->extra_have);
 506         data->got_remote_heads = 1;
 507
 508         return refs;
 509 }
 510
 511 static int fetch_refs_via_pack(struct transport *transport,
 512                                int nr_heads, struct ref **to_fetch)
 513 {
 514         struct git_transport_data *data = transport->data;
 515         char **heads = xmalloc(nr_heads * sizeof(*heads));
 516         char **origh = xmalloc(nr_heads * sizeof(*origh));
 517         const struct ref *refs;
 518         char *dest = xstrdup(transport->url);
 519         struct fetch_pack_args args;
 520         int i;
 521         struct ref *refs_tmp = NULL;
 522
 523         memset(&args, 0, sizeof(args));
 524         args.uploadpack = data->options.uploadpack;
 525         args.keep_pack = data->options.keep;
 526         args.lock_pack = 1;
 527         args.use_thin_pack = data->options.thin;
 528         args.include_tag = data->options.followtags;
 529         args.verbose = (transport->verbose > 0);
 530         args.quiet = (transport->verbose < 0);
 531         args.no_progress = !transport->progress;
 532         args.depth = data->options.depth;
 533
 534         for (i = 0; i < nr_heads; i++)
 535                 origh[i] = heads[i] = xstrdup(to_fetch[i]->name);
 536
 537         if (!data->got_remote_heads) {
 538                 connect_setup(transport, 0, 0);
 539                 get_remote_heads(data->fd[0], &refs_tmp, 0, NULL, 0, NULL);
 540                 data->got_remote_heads = 1;
 541         }
 542
 543         refs = fetch_pack(&args, data->fd, data->conn,
 544                           refs_tmp ? refs_tmp : transport->remote_refs,
 545                           dest, nr_heads, heads, &transport->pack_lockfile);
 546         close(data->fd[0]);
 547         close(data->fd[1]);
 548         if (finish_connect(data->conn))
 549                 refs = NULL;
 550         data->conn = NULL;
 551         data->got_remote_heads = 0;
 552
 553         free_refs(refs_tmp);
 554
 555         for (i = 0; i < nr_heads; i++)
 556                 free(origh[i]);
 557         free(origh);
 558         free(heads);
 559         free(dest);
 560         return (refs ? 0 : -1);
 561 }
 562
 563 static int push_had_errors(struct ref *ref)
 564 {
 565         for (; ref; ref = ref->next) {
 566                 switch (ref->status) {
 567                 case REF_STATUS_NONE:
 568                 case REF_STATUS_UPTODATE:
 569                 case REF_STATUS_OK:
 570                         break;
 571                 default:
 572                         return 1;
 573                 }
 574         }
 575         return 0;
 576 }
 577
 578 int transport_refs_pushed(struct ref *ref)
 579 {
 580         for (; ref; ref = ref->next) {
 581                 switch(ref->status) {
 582                 case REF_STATUS_NONE:
 583                 case REF_STATUS_UPTODATE:
 584                         break;
 585                 default:
 586                         return 1;
 587                 }
 588         }
 589         return 0;
 590 }
 591
 592 void transport_update_tracking_ref(struct remote *remote, struct ref *ref, int verbose)
 593 {
 594         struct refspec rs;
 595
 596         if (ref->status != REF_STATUS_OK && ref->status != REF_STATUS_UPTODATE)
 597                 return;
 598
 599         rs.src = ref->name;
 600         rs.dst = NULL;
 601
 602         if (!remote_find_tracking(remote, &rs)) {
 603                 if (verbose)
 604                         fprintf(stderr, "updating local tracking ref '%s'\n", rs.dst);
 605                 if (ref->deletion) {
 606                         delete_ref(rs.dst, NULL, 0);
 607                 } else
 608                         update_ref("update by push", rs.dst,
 609                                         ref->new_sha1, NULL, 0, 0);
 610                 free(rs.dst);
 611         }
 612 }
 613
 614 static void print_ref_status(char flag, const char *summary, struct ref *to, struct ref *from, const char *msg, int porcelain)
 615 {
 616         if (porcelain) {
 617                 if (from)
 618                         fprintf(stdout, "%c\t%s:%s\t", flag, from->name, to->name);
 619                 else
 620                         fprintf(stdout, "%c\t:%s\t", flag, to->name);
 621                 if (msg)
 622                         fprintf(stdout, "%s (%s)\n", summary, msg);
 623                 else
 624                         fprintf(stdout, "%s\n", summary);
 625         } else {
 626                 fprintf(stderr, " %c %-*s ", flag, TRANSPORT_SUMMARY_WIDTH, summary);
 627                 if (from)
 628                         fprintf(stderr, "%s -> %s", prettify_refname(from->name), prettify_refname(to->name));
 629                 else
 630                         fputs(prettify_refname(to->name), stderr);
 631                 if (msg) {
 632                         fputs(" (", stderr);
 633                         fputs(msg, stderr);
 634                         fputc(')', stderr);
 635                 }
 636                 fputc('\n', stderr);
 637         }
 638 }
 639
 640 static const char *status_abbrev(unsigned char sha1[20])
 641 {
 642         return find_unique_abbrev(sha1, DEFAULT_ABBREV);
 643 }
 644
 645 static void print_ok_ref_status(struct ref *ref, int porcelain)
 646 {
 647         if (ref->deletion)
 648                 print_ref_status('-', "[deleted]", ref, NULL, NULL, porcelain);
 649         else if (is_null_sha1(ref->old_sha1))
 650                 print_ref_status('*',
 651                         (!prefixcmp(ref->name, "refs/tags/") ? "[new tag]" :
 652                         "[new branch]"),
 653                         ref, ref->peer_ref, NULL, porcelain);
 654         else {
 655                 char quickref[84];
 656                 char type;
 657                 const char *msg;
 658
 659                 strcpy(quickref, status_abbrev(ref->old_sha1));
 660                 if (ref->nonfastforward) {
 661                         strcat(quickref, "...");
 662                         type = '+';
 663                         msg = "forced update";
 664                 } else {
 665                         strcat(quickref, "..");
 666                         type = ' ';
 667                         msg = NULL;
 668                 }
 669                 strcat(quickref, status_abbrev(ref->new_sha1));
 670
 671                 print_ref_status(type, quickref, ref, ref->peer_ref, msg, porcelain);
 672         }
 673 }
 674
 675 static int print_one_push_status(struct ref *ref, const char *dest, int count, int porcelain)
 676 {
 677         if (!count)
 678                 fprintf(porcelain ? stdout : stderr, "To %s\n", dest);
 679
 680         switch(ref->status) {
 681         case REF_STATUS_NONE:
 682                 print_ref_status('X', "[no match]", ref, NULL, NULL, porcelain);
 683                 break;
 684         case REF_STATUS_REJECT_NODELETE:
 685                 print_ref_status('!', "[rejected]", ref, NULL,
 686                                                  "remote does not support deleting refs", porcelain);
 687                 break;
 688         case REF_STATUS_UPTODATE:
 689                 print_ref_status('=', "[up to date]", ref,
 690                                                  ref->peer_ref, NULL, porcelain);
 691                 break;
 692         case REF_STATUS_REJECT_NONFASTFORWARD:
 693                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 694                                                  "non-fast-forward", porcelain);
 695                 break;
 696         case REF_STATUS_REMOTE_REJECT:
 697                 print_ref_status('!', "[remote rejected]", ref,
 698                                                  ref->deletion ? NULL : ref->peer_ref,
 699                                                  ref->remote_status, porcelain);
 700                 break;
 701         case REF_STATUS_EXPECTING_REPORT:
 702                 print_ref_status('!', "[remote failure]", ref,
 703                                                  ref->deletion ? NULL : ref->peer_ref,
 704                                                  "remote failed to report status", porcelain);
 705                 break;
 706         case REF_STATUS_OK:
 707                 print_ok_ref_status(ref, porcelain);
 708                 break;
 709         }
 710
 711         return 1;
 712 }
 713
 714 void transport_print_push_status(const char *dest, struct ref *refs,
 715                                   int verbose, int porcelain, int *nonfastforward)
 716 {
 717         struct ref *ref;
 718         int n = 0;
 719
 720         if (verbose) {
 721                 for (ref = refs; ref; ref = ref->next)
 722                         if (ref->status == REF_STATUS_UPTODATE)
 723                                 n += print_one_push_status(ref, dest, n, porcelain);
 724         }
 725
 726         for (ref = refs; ref; ref = ref->next)
 727                 if (ref->status == REF_STATUS_OK)
 728                         n += print_one_push_status(ref, dest, n, porcelain);
 729
 730         *nonfastforward = 0;
 731         for (ref = refs; ref; ref = ref->next) {
 732                 if (ref->status != REF_STATUS_NONE &&
 733                     ref->status != REF_STATUS_UPTODATE &&
 734                     ref->status != REF_STATUS_OK)
 735                         n += print_one_push_status(ref, dest, n, porcelain);
 736                 if (ref->status == REF_STATUS_REJECT_NONFASTFORWARD)
 737                         *nonfastforward = 1;
 738         }
 739 }
 740
 741 void transport_verify_remote_names(int nr_heads, const char **heads)
 742 {
 743         int i;
 744
 745         for (i = 0; i < nr_heads; i++) {
 746                 const char *local = heads[i];
 747                 const char *remote = strrchr(heads[i], ':');
 748
 749                 if (*local == '+')
 750                         local++;
 751
 752                 /* A matching refspec is okay.  */
 753                 if (remote == local && remote[1] == '\0')
 754                         continue;
 755
 756                 remote = remote ? (remote + 1) : local;
 757                 if (check_refname_format(remote,
 758                                 REFNAME_ALLOW_ONELEVEL|REFNAME_REFSPEC_PATTERN))
 759                         die("remote part of refspec is not a valid name in %s",
 760                                 heads[i]);
 761         }
 762 }
 763
 764 static int git_transport_push(struct transport *transport, struct ref *remote_refs, int flags)
 765 {
 766         struct git_transport_data *data = transport->data;
 767         struct send_pack_args args;
 768         int ret;
 769
 770         if (!data->got_remote_heads) {
 771                 struct ref *tmp_refs;
 772                 connect_setup(transport, 1, 0);
 773
 774                 get_remote_heads(data->fd[0], &tmp_refs, 0, NULL, REF_NORMAL,
 775                                  NULL);
 776                 data->got_remote_heads = 1;
 777         }
 778
 779         memset(&args, 0, sizeof(args));
 780         args.send_mirror = !!(flags & TRANSPORT_PUSH_MIRROR);
 781         args.force_update = !!(flags & TRANSPORT_PUSH_FORCE);
 782         args.use_thin_pack = data->options.thin;
 783         args.verbose = (transport->verbose > 0);
 784         args.quiet = (transport->verbose < 0);
 785         args.progress = transport->progress;
 786         args.dry_run = !!(flags & TRANSPORT_PUSH_DRY_RUN);
 787         args.porcelain = !!(flags & TRANSPORT_PUSH_PORCELAIN);
 788
 789         ret = send_pack(&args, data->fd, data->conn, remote_refs,
 790                         &data->extra_have);
 791
 792         close(data->fd[1]);
 793         close(data->fd[0]);
 794         ret |= finish_connect(data->conn);
 795         data->conn = NULL;
 796         data->got_remote_heads = 0;
 797
 798         return ret;
 799 }
 800
 801 static int connect_git(struct transport *transport, const char *name,
 802                        const char *executable, int fd[2])
 803 {
 804         struct git_transport_data *data = transport->data;
 805         data->conn = git_connect(data->fd, transport->url,
 806                                  executable, 0);
 807         fd[0] = data->fd[0];
 808         fd[1] = data->fd[1];
 809         return 0;
 810 }
 811
 812 static int disconnect_git(struct transport *transport)
 813 {
 814         struct git_transport_data *data = transport->data;
 815         if (data->conn) {
 816                 if (data->got_remote_heads)
 817                         packet_flush(data->fd[1]);
 818                 close(data->fd[0]);
 819                 close(data->fd[1]);
 820                 finish_connect(data->conn);
 821         }
 822
 823         free(data);
 824         return 0;
 825 }
 826
 827 void transport_take_over(struct transport *transport,
 828                          struct child_process *child)
 829 {
 830         struct git_transport_data *data;
 831
 832         if (!transport->smart_options)
 833                 die("Bug detected: Taking over transport requires non-NULL "
 834                     "smart_options field.");
 835
 836         data = xcalloc(1, sizeof(*data));
 837         data->options = *transport->smart_options;
 838         data->conn = child;
 839         data->fd[0] = data->conn->out;
 840         data->fd[1] = data->conn->in;
 841         data->got_remote_heads = 0;
 842         transport->data = data;
 843
 844         transport->set_option = NULL;
 845         transport->get_refs_list = get_refs_via_connect;
 846         transport->fetch = fetch_refs_via_pack;
 847         transport->push = NULL;
 848         transport->push_refs = git_transport_push;
 849         transport->disconnect = disconnect_git;
 850         transport->smart_options = &(data->options);
 851 }
 852
 853 static int is_local(const char *url)
 854 {
 855         const char *colon = strchr(url, ':');
 856         const char *slash = strchr(url, '/');
 857         return !colon || (slash && slash < colon) ||
 858                 has_dos_drive_prefix(url);
 859 }
 860
 861 static int is_file(const char *url)
 862 {
 863         struct stat buf;
 864         if (stat(url, &buf))
 865                 return 0;
 866         return S_ISREG(buf.st_mode);
 867 }
 868
 869 static int external_specification_len(const char *url)
 870 {
 871         return strchr(url, ':') - url;
 872 }
 873
 874 struct transport *transport_get(struct remote *remote, const char *url)
 875 {
 876         const char *helper;
 877         struct transport *ret = xcalloc(1, sizeof(*ret));
 878
 879         ret->progress = isatty(2);
 880
 881         if (!remote)
 882                 die("No remote provided to transport_get()");
 883
 884         ret->got_remote_refs = 0;
 885         ret->remote = remote;
 886         helper = remote->foreign_vcs;
 887
 888         if (!url && remote->url)
 889                 url = remote->url[0];
 890         ret->url = url;
 891
 892         /* maybe it is a foreign URL? */
 893         if (url) {
 894                 const char *p = url;
 895
 896                 while (is_urlschemechar(p == url, *p))
 897                         p++;
 898                 if (!prefixcmp(p, "::"))
 899                         helper = xstrndup(url, p - url);
 900         }
 901
 902         if (helper) {
 903                 transport_helper_init(ret, helper);
 904         } else if (!prefixcmp(url, "rsync:")) {
 905                 ret->get_refs_list = get_refs_via_rsync;
 906                 ret->fetch = fetch_objs_via_rsync;
 907                 ret->push = rsync_transport_push;
 908                 ret->smart_options = NULL;
 909         } else if (is_local(url) && is_file(url)) {
 910                 struct bundle_transport_data *data = xcalloc(1, sizeof(*data));
 911                 ret->data = data;
 912                 ret->get_refs_list = get_refs_from_bundle;
 913                 ret->fetch = fetch_refs_from_bundle;
 914                 ret->disconnect = close_bundle;
 915                 ret->smart_options = NULL;
 916         } else if (!is_url(url)
 917                 || !prefixcmp(url, "file://")
 918                 || !prefixcmp(url, "git://")
 919                 || !prefixcmp(url, "ssh://")
 920                 || !prefixcmp(url, "git+ssh://")
 921                 || !prefixcmp(url, "ssh+git://")) {
 922                 /* These are builtin smart transports. */
 923                 struct git_transport_data *data = xcalloc(1, sizeof(*data));
 924                 ret->data = data;
 925                 ret->set_option = NULL;
 926                 ret->get_refs_list = get_refs_via_connect;
 927                 ret->fetch = fetch_refs_via_pack;
 928                 ret->push_refs = git_transport_push;
 929                 ret->connect = connect_git;
 930                 ret->disconnect = disconnect_git;
 931                 ret->smart_options = &(data->options);
 932
 933                 data->conn = NULL;
 934                 data->got_remote_heads = 0;
 935         } else {
 936                 /* Unknown protocol in URL. Pass to external handler. */
 937                 int len = external_specification_len(url);
 938                 char *handler = xmalloc(len + 1);
 939                 handler[len] = 0;
 940                 strncpy(handler, url, len);
 941                 transport_helper_init(ret, handler);
 942         }
 943
 944         if (ret->smart_options) {
 945                 ret->smart_options->thin = 1;
 946                 ret->smart_options->uploadpack = "git-upload-pack";
 947                 if (remote->uploadpack)
 948                         ret->smart_options->uploadpack = remote->uploadpack;
 949                 ret->smart_options->receivepack = "git-receive-pack";
 950                 if (remote->receivepack)
 951                         ret->smart_options->receivepack = remote->receivepack;
 952         }
 953
 954         return ret;
 955 }
 956
 957 int transport_set_option(struct transport *transport,
 958                          const char *name, const char *value)
 959 {
 960         int git_reports = 1, protocol_reports = 1;
 961
 962         if (transport->smart_options)
 963                 git_reports = set_git_option(transport->smart_options,
 964                                              name, value);
 965
 966         if (transport->set_option)
 967                 protocol_reports = transport->set_option(transport, name,
 968                                                         value);
 969
 970         /* If either report is 0, report 0 (success). */
 971         if (!git_reports || !protocol_reports)
 972                 return 0;
 973         /* If either reports -1 (invalid value), report -1. */
 974         if ((git_reports == -1) || (protocol_reports == -1))
 975                 return -1;
 976         /* Otherwise if both report unknown, report unknown. */
 977         return 1;
 978 }
 979
 980 void transport_set_verbosity(struct transport *transport, int verbosity,
 981         int force_progress)
 982 {
 983         if (verbosity >= 2)
 984                 transport->verbose = verbosity <= 3 ? verbosity : 3;
 985         if (verbosity < 0)
 986                 transport->verbose = -1;
 987
 988         /**
 989          * Rules used to determine whether to report progress (processing aborts
 990          * when a rule is satisfied):
 991          *
 992          *   1. Report progress, if force_progress is 1 (ie. --progress).
 993          *   2. Don't report progress, if verbosity < 0 (ie. -q/--quiet ).
 994          *   3. Report progress if isatty(2) is 1.
 995          **/
 996         transport->progress = force_progress || (verbosity >= 0 && isatty(2));
 997 }
 998
 999 int transport_push(struct transport *transport,
1000                    int refspec_nr, const char **refspec, int flags,
1001                    int *nonfastforward)
1002 {
1003         *nonfastforward = 0;
1004         transport_verify_remote_names(refspec_nr, refspec);
1005
1006         if (transport->push) {
1007                 /* Maybe FIXME. But no important transport uses this case. */
1008                 if (flags & TRANSPORT_PUSH_SET_UPSTREAM)
1009                         die("This transport does not support using --set-upstream");
1010
1011                 return transport->push(transport, refspec_nr, refspec, flags);
1012         } else if (transport->push_refs) {
1013                 struct ref *remote_refs =
1014                         transport->get_refs_list(transport, 1);
1015                 struct ref *local_refs = get_local_heads();
1016                 int match_flags = MATCH_REFS_NONE;
1017                 int verbose = (transport->verbose > 0);
1018                 int quiet = (transport->verbose < 0);
1019                 int porcelain = flags & TRANSPORT_PUSH_PORCELAIN;
1020                 int pretend = flags & TRANSPORT_PUSH_DRY_RUN;
1021                 int push_ret, ret, err;
1022
1023                 if (flags & TRANSPORT_PUSH_ALL)
1024                         match_flags |= MATCH_REFS_ALL;
1025                 if (flags & TRANSPORT_PUSH_MIRROR)
1026                         match_flags |= MATCH_REFS_MIRROR;
1027
1028                 if (match_refs(local_refs, &remote_refs,
1029                                refspec_nr, refspec, match_flags)) {
1030                         return -1;
1031                 }
1032
1033                 set_ref_status_for_push(remote_refs,
1034                         flags & TRANSPORT_PUSH_MIRROR,
1035                         flags & TRANSPORT_PUSH_FORCE);
1036
1037                 if ((flags & TRANSPORT_RECURSE_SUBMODULES_CHECK) && !is_bare_repository()) {
1038                         struct ref *ref = remote_refs;
1039                         for (; ref; ref = ref->next)
1040                                 if (!is_null_sha1(ref->new_sha1) &&
1041                                     check_submodule_needs_pushing(ref->new_sha1,transport->remote->name))
1042                                         die("There are unpushed submodules, aborting.");
1043                 }
1044
1045                 push_ret = transport->push_refs(transport, remote_refs, flags);
1046                 err = push_had_errors(remote_refs);
1047                 ret = push_ret | err;
1048
1049                 if (!quiet || err)
1050                         transport_print_push_status(transport->url, remote_refs,
1051                                         verbose | porcelain, porcelain,
1052                                         nonfastforward);
1053
1054                 if (flags & TRANSPORT_PUSH_SET_UPSTREAM)
1055                         set_upstreams(transport, remote_refs, pretend);
1056
1057                 if (!(flags & TRANSPORT_PUSH_DRY_RUN)) {
1058                         struct ref *ref;
1059                         for (ref = remote_refs; ref; ref = ref->next)
1060                                 transport_update_tracking_ref(transport->remote, ref, verbose);
1061                 }
1062
1063                 if (porcelain && !push_ret)
1064                         puts("Done");
1065                 else if (!quiet && !ret && !transport_refs_pushed(remote_refs))
1066                         fprintf(stderr, "Everything up-to-date\n");
1067
1068                 return ret;
1069         }
1070         return 1;
1071 }
1072
1073 const struct ref *transport_get_remote_refs(struct transport *transport)
1074 {
1075         if (!transport->got_remote_refs) {
1076                 transport->remote_refs = transport->get_refs_list(transport, 0);
1077                 transport->got_remote_refs = 1;
1078         }
1079
1080         return transport->remote_refs;
1081 }
1082
1083 int transport_fetch_refs(struct transport *transport, struct ref *refs)
1084 {
1085         int rc;
1086         int nr_heads = 0, nr_alloc = 0, nr_refs = 0;
1087         struct ref **heads = NULL;
1088         struct ref *rm;
1089
1090         for (rm = refs; rm; rm = rm->next) {
1091                 nr_refs++;
1092                 if (rm->peer_ref &&
1093                     !is_null_sha1(rm->old_sha1) &&
1094                     !hashcmp(rm->peer_ref->old_sha1, rm->old_sha1))
1095                         continue;
1096                 ALLOC_GROW(heads, nr_heads + 1, nr_alloc);
1097                 heads[nr_heads++] = rm;
1098         }
1099
1100         if (!nr_heads) {
1101                 /*
1102                  * When deepening of a shallow repository is requested,
1103                  * then local and remote refs are likely to still be equal.
1104                  * Just feed them all to the fetch method in that case.
1105                  * This condition shouldn't be met in a non-deepening fetch
1106                  * (see builtin-fetch.c:quickfetch()).
1107                  */
1108                 heads = xmalloc(nr_refs * sizeof(*heads));
1109                 for (rm = refs; rm; rm = rm->next)
1110                         heads[nr_heads++] = rm;
1111         }
1112
1113         rc = transport->fetch(transport, nr_heads, heads);
1114
1115         free(heads);
1116         return rc;
1117 }
1118
1119 void transport_unlock_pack(struct transport *transport)
1120 {
1121         if (transport->pack_lockfile) {
1122                 unlink_or_warn(transport->pack_lockfile);
1123                 free(transport->pack_lockfile);
1124                 transport->pack_lockfile = NULL;
1125         }
1126 }
1127
1128 int transport_connect(struct transport *transport, const char *name,
1129                       const char *exec, int fd[2])
1130 {
1131         if (transport->connect)
1132                 return transport->connect(transport, name, exec, fd);
1133         else
1134                 die("Operation not supported by protocol");
1135 }
1136
1137 int transport_disconnect(struct transport *transport)
1138 {
1139         int ret = 0;
1140         if (transport->disconnect)
1141                 ret = transport->disconnect(transport);
1142         free(transport);
1143         return ret;
1144 }
1145
1146 /*
1147  * Strip username (and password) from an url and return
1148  * it in a newly allocated string.
1149  */
1150 char *transport_anonymize_url(const char *url)
1151 {
1152         char *anon_url, *scheme_prefix, *anon_part;
1153         size_t anon_len, prefix_len = 0;
1154
1155         anon_part = strchr(url, '@');
1156         if (is_local(url) || !anon_part)
1157                 goto literal_copy;
1158
1159         anon_len = strlen(++anon_part);
1160         scheme_prefix = strstr(url, "://");
1161         if (!scheme_prefix) {
1162                 if (!strchr(anon_part, ':'))
1163                         /* cannot be "me@there:/path/name" */
1164                         goto literal_copy;
1165         } else {
1166                 const char *cp;
1167                 /* make sure scheme is reasonable */
1168                 for (cp = url; cp < scheme_prefix; cp++) {
1169                         switch (*cp) {
1170                                 /* RFC 1738 2.1 */
1171                         case '+': case '.': case '-':
1172                                 break; /* ok */
1173                         default:
1174                                 if (isalnum(*cp))
1175                                         break;
1176                                 /* it isn't */
1177                                 goto literal_copy;
1178                         }
1179                 }
1180                 /* @ past the first slash does not count */
1181                 cp = strchr(scheme_prefix + 3, '/');
1182                 if (cp && cp < anon_part)
1183                         goto literal_copy;
1184                 prefix_len = scheme_prefix - url + 3;
1185         }
1186         anon_url = xcalloc(1, 1 + prefix_len + anon_len);
1187         memcpy(anon_url, url, prefix_len);
1188         memcpy(anon_url + prefix_len, anon_part, anon_len);
1189         return anon_url;
1190 literal_copy:
1191         return xstrdup(url);
1192 }
1193
1194 struct alternate_refs_data {
1195         alternate_ref_fn *fn;
1196         void *data;
1197 };
1198
1199 static int refs_from_alternate_cb(struct alternate_object_database *e,
1200                                   void *data)
1201 {
1202         char *other;
1203         size_t len;
1204         struct remote *remote;
1205         struct transport *transport;
1206         const struct ref *extra;
1207         struct alternate_refs_data *cb = data;
1208
1209         e->name[-1] = '\0';
1210         other = xstrdup(real_path(e->base));
1211         e->name[-1] = '/';
1212         len = strlen(other);
1213
1214         while (other[len-1] == '/')
1215                 other[--len] = '\0';
1216         if (len < 8 || memcmp(other + len - 8, "/objects", 8))
1217                 return 0;
1218         /* Is this a git repository with refs? */
1219         memcpy(other + len - 8, "/refs", 6);
1220         if (!is_directory(other))
1221                 return 0;
1222         other[len - 8] = '\0';
1223         remote = remote_get(other);
1224         transport = transport_get(remote, other);
1225         for (extra = transport_get_remote_refs(transport);
1226              extra;
1227              extra = extra->next)
1228                 cb->fn(extra, cb->data);
1229         transport_disconnect(transport);
1230         free(other);
1231         return 0;
1232 }
1233
1234 void for_each_alternate_ref(alternate_ref_fn fn, void *data)
1235 {
1236         struct alternate_refs_data cb;
1237         cb.fn = fn;
1238         cb.data = data;
1239         foreach_alt_odb(refs_from_alternate_cb, &cb);
1240 }