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