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 #include "string-list.h"
  15
  16 /* rsync support */
  17
  18 /*
  19  * We copy packed-refs and refs/ into a temporary file, then read the
  20  * loose refs recursively (sorting whenever possible), and then inserting
  21  * those packed refs that are not yet in the list (not validating, but
  22  * assuming that the file is sorted).
  23  *
  24  * Appears refactoring this from refs.c is too cumbersome.
  25  */
  26
  27 static int str_cmp(const void *a, const void *b)
  28 {
  29         const char *s1 = a;
  30         const char *s2 = b;
  31
  32         return strcmp(s1, s2);
  33 }
  34
  35 /* path->buf + name_offset is expected to point to "refs/" */
  36
  37 static int read_loose_refs(struct strbuf *path, int name_offset,
  38                 struct ref **tail)
  39 {
  40         DIR *dir = opendir(path->buf);
  41         struct dirent *de;
  42         struct {
  43                 char **entries;
  44                 int nr, alloc;
  45         } list;
  46         int i, pathlen;
  47
  48         if (!dir)
  49                 return -1;
  50
  51         memset (&list, 0, sizeof(list));
  52
  53         while ((de = readdir(dir))) {
  54                 if (is_dot_or_dotdot(de->d_name))
  55                         continue;
  56                 ALLOC_GROW(list.entries, list.nr + 1, list.alloc);
  57                 list.entries[list.nr++] = xstrdup(de->d_name);
  58         }
  59         closedir(dir);
  60
  61         /* sort the list */
  62
  63         qsort(list.entries, list.nr, sizeof(char *), str_cmp);
  64
  65         pathlen = path->len;
  66         strbuf_addch(path, '/');
  67
  68         for (i = 0; i < list.nr; i++, strbuf_setlen(path, pathlen + 1)) {
  69                 strbuf_addstr(path, list.entries[i]);
  70                 if (read_loose_refs(path, name_offset, tail)) {
  71                         int fd = open(path->buf, O_RDONLY);
  72                         char buffer[40];
  73                         struct ref *next;
  74
  75                         if (fd < 0)
  76                                 continue;
  77                         next = alloc_ref(path->buf + name_offset);
  78                         if (read_in_full(fd, buffer, 40) != 40 ||
  79                                         get_sha1_hex(buffer, next->old_sha1)) {
  80                                 close(fd);
  81                                 free(next);
  82                                 continue;
  83                         }
  84                         close(fd);
  85                         (*tail)->next = next;
  86                         *tail = next;
  87                 }
  88         }
  89         strbuf_setlen(path, pathlen);
  90
  91         for (i = 0; i < list.nr; i++)
  92                 free(list.entries[i]);
  93         free(list.entries);
  94
  95         return 0;
  96 }
  97
  98 /* insert the packed refs for which no loose refs were found */
  99
 100 static void insert_packed_refs(const char *packed_refs, struct ref **list)
 101 {
 102         FILE *f = fopen(packed_refs, "r");
 103         static char buffer[PATH_MAX];
 104
 105         if (!f)
 106                 return;
 107
 108         for (;;) {
 109                 int cmp = cmp, len;
 110
 111                 if (!fgets(buffer, sizeof(buffer), f)) {
 112                         fclose(f);
 113                         return;
 114                 }
 115
 116                 if (hexval(buffer[0]) > 0xf)
 117                         continue;
 118                 len = strlen(buffer);
 119                 if (len && buffer[len - 1] == '\n')
 120                         buffer[--len] = '\0';
 121                 if (len < 41)
 122                         continue;
 123                 while ((*list)->next &&
 124                                 (cmp = strcmp(buffer + 41,
 125                                       (*list)->next->name)) > 0)
 126                         list = &(*list)->next;
 127                 if (!(*list)->next || cmp < 0) {
 128                         struct ref *next = alloc_ref(buffer + 41);
 129                         buffer[40] = '\0';
 130                         if (get_sha1_hex(buffer, next->old_sha1)) {
 131                                 warning ("invalid SHA-1: %s", buffer);
 132                                 free(next);
 133                                 continue;
 134                         }
 135                         next->next = (*list)->next;
 136                         (*list)->next = next;
 137                         list = &(*list)->next;
 138                 }
 139         }
 140 }
 141
 142 static void set_upstreams(struct transport *transport, struct ref *refs,
 143         int pretend)
 144 {
 145         struct ref *ref;
 146         for (ref = refs; ref; ref = ref->next) {
 147                 const char *localname;
 148                 const char *tmp;
 149                 const char *remotename;
 150                 unsigned char sha[20];
 151                 int flag = 0;
 152                 /*
 153                  * Check suitability for tracking. Must be successful /
 154                  * already up-to-date ref create/modify (not delete).
 155                  */
 156                 if (ref->status != REF_STATUS_OK &&
 157                         ref->status != REF_STATUS_UPTODATE)
 158                         continue;
 159                 if (!ref->peer_ref)
 160                         continue;
 161                 if (is_null_sha1(ref->new_sha1))
 162                         continue;
 163
 164                 /* Follow symbolic refs (mainly for HEAD). */
 165                 localname = ref->peer_ref->name;
 166                 remotename = ref->name;
 167                 tmp = resolve_ref_unsafe(localname, sha, 1, &flag);
 168                 if (tmp && flag & REF_ISSYMREF &&
 169                         !prefixcmp(tmp, "refs/heads/"))
 170                         localname = tmp;
 171
 172                 /* Both source and destination must be local branches. */
 173                 if (!localname || prefixcmp(localname, "refs/heads/"))
 174                         continue;
 175                 if (!remotename || prefixcmp(remotename, "refs/heads/"))
 176                         continue;
 177
 178                 if (!pretend)
 179                         install_branch_config(BRANCH_CONFIG_VERBOSE,
 180                                 localname + 11, transport->remote->name,
 181                                 remotename);
 182                 else
 183                         printf("Would set upstream of '%s' to '%s' of '%s'\n",
 184                                 localname + 11, remotename + 11,
 185                                 transport->remote->name);
 186         }
 187 }
 188
 189 static const char *rsync_url(const char *url)
 190 {
 191         return prefixcmp(url, "rsync://") ? skip_prefix(url, "rsync:") : url;
 192 }
 193
 194 static struct ref *get_refs_via_rsync(struct transport *transport, int for_push)
 195 {
 196         struct strbuf buf = STRBUF_INIT, temp_dir = STRBUF_INIT;
 197         struct ref dummy = {NULL}, *tail = &dummy;
 198         struct child_process rsync;
 199         const char *args[5];
 200         int temp_dir_len;
 201
 202         if (for_push)
 203                 return NULL;
 204
 205         /* copy the refs to the temporary directory */
 206
 207         strbuf_addstr(&temp_dir, git_path("rsync-refs-XXXXXX"));
 208         if (!mkdtemp(temp_dir.buf))
 209                 die_errno ("Could not make temporary directory");
 210         temp_dir_len = temp_dir.len;
 211
 212         strbuf_addstr(&buf, rsync_url(transport->url));
 213         strbuf_addstr(&buf, "/refs");
 214
 215         memset(&rsync, 0, sizeof(rsync));
 216         rsync.argv = args;
 217         rsync.stdout_to_stderr = 1;
 218         args[0] = "rsync";
 219         args[1] = (transport->verbose > 1) ? "-rv" : "-r";
 220         args[2] = buf.buf;
 221         args[3] = temp_dir.buf;
 222         args[4] = NULL;
 223
 224         if (run_command(&rsync))
 225                 die ("Could not run rsync to get refs");
 226
 227         strbuf_reset(&buf);
 228         strbuf_addstr(&buf, rsync_url(transport->url));
 229         strbuf_addstr(&buf, "/packed-refs");
 230
 231         args[2] = buf.buf;
 232
 233         if (run_command(&rsync))
 234                 die ("Could not run rsync to get refs");
 235
 236         /* read the copied refs */
 237
 238         strbuf_addstr(&temp_dir, "/refs");
 239         read_loose_refs(&temp_dir, temp_dir_len + 1, &tail);
 240         strbuf_setlen(&temp_dir, temp_dir_len);
 241
 242         tail = &dummy;
 243         strbuf_addstr(&temp_dir, "/packed-refs");
 244         insert_packed_refs(temp_dir.buf, &tail);
 245         strbuf_setlen(&temp_dir, temp_dir_len);
 246
 247         if (remove_dir_recursively(&temp_dir, 0))
 248                 warning ("Error removing temporary directory %s.",
 249                                 temp_dir.buf);
 250
 251         strbuf_release(&buf);
 252         strbuf_release(&temp_dir);
 253
 254         return dummy.next;
 255 }
 256
 257 static int fetch_objs_via_rsync(struct transport *transport,
 258                                 int nr_objs, struct ref **to_fetch)
 259 {
 260         struct strbuf buf = STRBUF_INIT;
 261         struct child_process rsync;
 262         const char *args[8];
 263         int result;
 264
 265         strbuf_addstr(&buf, rsync_url(transport->url));
 266         strbuf_addstr(&buf, "/objects/");
 267
 268         memset(&rsync, 0, sizeof(rsync));
 269         rsync.argv = args;
 270         rsync.stdout_to_stderr = 1;
 271         args[0] = "rsync";
 272         args[1] = (transport->verbose > 1) ? "-rv" : "-r";
 273         args[2] = "--ignore-existing";
 274         args[3] = "--exclude";
 275         args[4] = "info";
 276         args[5] = buf.buf;
 277         args[6] = get_object_directory();
 278         args[7] = NULL;
 279
 280         /* NEEDSWORK: handle one level of alternates */
 281         result = run_command(&rsync);
 282
 283         strbuf_release(&buf);
 284
 285         return result;
 286 }
 287
 288 static int write_one_ref(const char *name, const unsigned char *sha1,
 289                 int flags, void *data)
 290 {
 291         struct strbuf *buf = data;
 292         int len = buf->len;
 293         FILE *f;
 294
 295         /* when called via for_each_ref(), flags is non-zero */
 296         if (flags && prefixcmp(name, "refs/heads/") &&
 297                         prefixcmp(name, "refs/tags/"))
 298                 return 0;
 299
 300         strbuf_addstr(buf, name);
 301         if (safe_create_leading_directories(buf->buf) ||
 302                         !(f = fopen(buf->buf, "w")) ||
 303                         fprintf(f, "%s\n", sha1_to_hex(sha1)) < 0 ||
 304                         fclose(f))
 305                 return error("problems writing temporary file %s", buf->buf);
 306         strbuf_setlen(buf, len);
 307         return 0;
 308 }
 309
 310 static int write_refs_to_temp_dir(struct strbuf *temp_dir,
 311                 int refspec_nr, const char **refspec)
 312 {
 313         int i;
 314
 315         for (i = 0; i < refspec_nr; i++) {
 316                 unsigned char sha1[20];
 317                 char *ref;
 318
 319                 if (dwim_ref(refspec[i], strlen(refspec[i]), sha1, &ref) != 1)
 320                         return error("Could not get ref %s", refspec[i]);
 321
 322                 if (write_one_ref(ref, sha1, 0, temp_dir)) {
 323                         free(ref);
 324                         return -1;
 325                 }
 326                 free(ref);
 327         }
 328         return 0;
 329 }
 330
 331 static int rsync_transport_push(struct transport *transport,
 332                 int refspec_nr, const char **refspec, int flags)
 333 {
 334         struct strbuf buf = STRBUF_INIT, temp_dir = STRBUF_INIT;
 335         int result = 0, i;
 336         struct child_process rsync;
 337         const char *args[10];
 338
 339         if (flags & TRANSPORT_PUSH_MIRROR)
 340                 return error("rsync transport does not support mirror mode");
 341
 342         /* first push the objects */
 343
 344         strbuf_addstr(&buf, rsync_url(transport->url));
 345         strbuf_addch(&buf, '/');
 346
 347         memset(&rsync, 0, sizeof(rsync));
 348         rsync.argv = args;
 349         rsync.stdout_to_stderr = 1;
 350         i = 0;
 351         args[i++] = "rsync";
 352         args[i++] = "-a";
 353         if (flags & TRANSPORT_PUSH_DRY_RUN)
 354                 args[i++] = "--dry-run";
 355         if (transport->verbose > 1)
 356                 args[i++] = "-v";
 357         args[i++] = "--ignore-existing";
 358         args[i++] = "--exclude";
 359         args[i++] = "info";
 360         args[i++] = get_object_directory();
 361         args[i++] = buf.buf;
 362         args[i++] = NULL;
 363
 364         if (run_command(&rsync))
 365                 return error("Could not push objects to %s",
 366                                 rsync_url(transport->url));
 367
 368         /* copy the refs to the temporary directory; they could be packed. */
 369
 370         strbuf_addstr(&temp_dir, git_path("rsync-refs-XXXXXX"));
 371         if (!mkdtemp(temp_dir.buf))
 372                 die_errno ("Could not make temporary directory");
 373         strbuf_addch(&temp_dir, '/');
 374
 375         if (flags & TRANSPORT_PUSH_ALL) {
 376                 if (for_each_ref(write_one_ref, &temp_dir))
 377                         return -1;
 378         } else if (write_refs_to_temp_dir(&temp_dir, refspec_nr, refspec))
 379                 return -1;
 380
 381         i = 2;
 382         if (flags & TRANSPORT_PUSH_DRY_RUN)
 383                 args[i++] = "--dry-run";
 384         if (!(flags & TRANSPORT_PUSH_FORCE))
 385                 args[i++] = "--ignore-existing";
 386         args[i++] = temp_dir.buf;
 387         args[i++] = rsync_url(transport->url);
 388         args[i++] = NULL;
 389         if (run_command(&rsync))
 390                 result = error("Could not push to %s",
 391                                 rsync_url(transport->url));
 392
 393         if (remove_dir_recursively(&temp_dir, 0))
 394                 warning ("Could not remove temporary directory %s.",
 395                                 temp_dir.buf);
 396
 397         strbuf_release(&buf);
 398         strbuf_release(&temp_dir);
 399
 400         return result;
 401 }
 402
 403 struct bundle_transport_data {
 404         int fd;
 405         struct bundle_header header;
 406 };
 407
 408 static struct ref *get_refs_from_bundle(struct transport *transport, int for_push)
 409 {
 410         struct bundle_transport_data *data = transport->data;
 411         struct ref *result = NULL;
 412         int i;
 413
 414         if (for_push)
 415                 return NULL;
 416
 417         if (data->fd > 0)
 418                 close(data->fd);
 419         data->fd = read_bundle_header(transport->url, &data->header);
 420         if (data->fd < 0)
 421                 die ("Could not read bundle '%s'.", transport->url);
 422         for (i = 0; i < data->header.references.nr; i++) {
 423                 struct ref_list_entry *e = data->header.references.list + i;
 424                 struct ref *ref = alloc_ref(e->name);
 425                 hashcpy(ref->old_sha1, e->sha1);
 426                 ref->next = result;
 427                 result = ref;
 428         }
 429         return result;
 430 }
 431
 432 static int fetch_refs_from_bundle(struct transport *transport,
 433                                int nr_heads, struct ref **to_fetch)
 434 {
 435         struct bundle_transport_data *data = transport->data;
 436         return unbundle(&data->header, data->fd,
 437                         transport->progress ? BUNDLE_VERBOSE : 0);
 438 }
 439
 440 static int close_bundle(struct transport *transport)
 441 {
 442         struct bundle_transport_data *data = transport->data;
 443         if (data->fd > 0)
 444                 close(data->fd);
 445         free(data);
 446         return 0;
 447 }
 448
 449 struct git_transport_data {
 450         struct git_transport_options options;
 451         struct child_process *conn;
 452         int fd[2];
 453         unsigned got_remote_heads : 1;
 454         struct extra_have_objects extra_have;
 455 };
 456
 457 static int set_git_option(struct git_transport_options *opts,
 458                           const char *name, const char *value)
 459 {
 460         if (!strcmp(name, TRANS_OPT_UPLOADPACK)) {
 461                 opts->uploadpack = value;
 462                 return 0;
 463         } else if (!strcmp(name, TRANS_OPT_RECEIVEPACK)) {
 464                 opts->receivepack = value;
 465                 return 0;
 466         } else if (!strcmp(name, TRANS_OPT_THIN)) {
 467                 opts->thin = !!value;
 468                 return 0;
 469         } else if (!strcmp(name, TRANS_OPT_FOLLOWTAGS)) {
 470                 opts->followtags = !!value;
 471                 return 0;
 472         } else if (!strcmp(name, TRANS_OPT_KEEP)) {
 473                 opts->keep = !!value;
 474                 return 0;
 475         } else if (!strcmp(name, TRANS_OPT_DEPTH)) {
 476                 if (!value)
 477                         opts->depth = 0;
 478                 else {
 479                         char *end;
 480                         opts->depth = strtol(value, &end, 0);
 481                         if (*end)
 482                                 die("transport: invalid depth option '%s'", value);
 483                 }
 484                 return 0;
 485         }
 486         return 1;
 487 }
 488
 489 static int connect_setup(struct transport *transport, int for_push, int verbose)
 490 {
 491         struct git_transport_data *data = transport->data;
 492
 493         if (data->conn)
 494                 return 0;
 495
 496         data->conn = git_connect(data->fd, transport->url,
 497                                  for_push ? data->options.receivepack :
 498                                  data->options.uploadpack,
 499                                  verbose ? CONNECT_VERBOSE : 0);
 500
 501         return 0;
 502 }
 503
 504 static struct ref *get_refs_via_connect(struct transport *transport, int for_push)
 505 {
 506         struct git_transport_data *data = transport->data;
 507         struct ref *refs;
 508
 509         connect_setup(transport, for_push, 0);
 510         get_remote_heads(data->fd[0], &refs,
 511                          for_push ? REF_NORMAL : 0, &data->extra_have);
 512         data->got_remote_heads = 1;
 513
 514         return refs;
 515 }
 516
 517 static int fetch_refs_via_pack(struct transport *transport,
 518                                int nr_heads, struct ref **to_fetch)
 519 {
 520         struct git_transport_data *data = transport->data;
 521         struct string_list sought = STRING_LIST_INIT_DUP;
 522         const struct ref *refs;
 523         char *dest = xstrdup(transport->url);
 524         struct fetch_pack_args args;
 525         int i;
 526         struct ref *refs_tmp = NULL;
 527
 528         memset(&args, 0, sizeof(args));
 529         args.uploadpack = data->options.uploadpack;
 530         args.keep_pack = data->options.keep;
 531         args.lock_pack = 1;
 532         args.use_thin_pack = data->options.thin;
 533         args.include_tag = data->options.followtags;
 534         args.verbose = (transport->verbose > 1);
 535         args.quiet = (transport->verbose < 0);
 536         args.no_progress = !transport->progress;
 537         args.depth = data->options.depth;
 538
 539         for (i = 0; i < nr_heads; i++)
 540                 string_list_append(&sought, to_fetch[i]->name);
 541
 542         if (!data->got_remote_heads) {
 543                 connect_setup(transport, 0, 0);
 544                 get_remote_heads(data->fd[0], &refs_tmp, 0, NULL);
 545                 data->got_remote_heads = 1;
 546         }
 547
 548         refs = fetch_pack(&args, data->fd, data->conn,
 549                           refs_tmp ? refs_tmp : transport->remote_refs,
 550                           dest, &sought, &transport->pack_lockfile);
 551         close(data->fd[0]);
 552         close(data->fd[1]);
 553         if (finish_connect(data->conn))
 554                 refs = NULL;
 555         data->conn = NULL;
 556         data->got_remote_heads = 0;
 557
 558         free_refs(refs_tmp);
 559
 560         string_list_clear(&sought, 0);
 561         free(dest);
 562         return (refs ? 0 : -1);
 563 }
 564
 565 static int push_had_errors(struct ref *ref)
 566 {
 567         for (; ref; ref = ref->next) {
 568                 switch (ref->status) {
 569                 case REF_STATUS_NONE:
 570                 case REF_STATUS_UPTODATE:
 571                 case REF_STATUS_OK:
 572                         break;
 573                 default:
 574                         return 1;
 575                 }
 576         }
 577         return 0;
 578 }
 579
 580 int transport_refs_pushed(struct ref *ref)
 581 {
 582         for (; ref; ref = ref->next) {
 583                 switch(ref->status) {
 584                 case REF_STATUS_NONE:
 585                 case REF_STATUS_UPTODATE:
 586                         break;
 587                 default:
 588                         return 1;
 589                 }
 590         }
 591         return 0;
 592 }
 593
 594 void transport_update_tracking_ref(struct remote *remote, struct ref *ref, int verbose)
 595 {
 596         struct refspec rs;
 597
 598         if (ref->status != REF_STATUS_OK && ref->status != REF_STATUS_UPTODATE)
 599                 return;
 600
 601         rs.src = ref->name;
 602         rs.dst = NULL;
 603
 604         if (!remote_find_tracking(remote, &rs)) {
 605                 if (verbose)
 606                         fprintf(stderr, "updating local tracking ref '%s'\n", rs.dst);
 607                 if (ref->deletion) {
 608                         delete_ref(rs.dst, NULL, 0);
 609                 } else
 610                         update_ref("update by push", rs.dst,
 611                                         ref->new_sha1, NULL, 0, 0);
 612                 free(rs.dst);
 613         }
 614 }
 615
 616 static void print_ref_status(char flag, const char *summary, struct ref *to, struct ref *from, const char *msg, int porcelain)
 617 {
 618         if (porcelain) {
 619                 if (from)
 620                         fprintf(stdout, "%c\t%s:%s\t", flag, from->name, to->name);
 621                 else
 622                         fprintf(stdout, "%c\t:%s\t", flag, to->name);
 623                 if (msg)
 624                         fprintf(stdout, "%s (%s)\n", summary, msg);
 625                 else
 626                         fprintf(stdout, "%s\n", summary);
 627         } else {
 628                 fprintf(stderr, " %c %-*s ", flag, TRANSPORT_SUMMARY_WIDTH, summary);
 629                 if (from)
 630                         fprintf(stderr, "%s -> %s", prettify_refname(from->name), prettify_refname(to->name));
 631                 else
 632                         fputs(prettify_refname(to->name), stderr);
 633                 if (msg) {
 634                         fputs(" (", stderr);
 635                         fputs(msg, stderr);
 636                         fputc(')', stderr);
 637                 }
 638                 fputc('\n', stderr);
 639         }
 640 }
 641
 642 static const char *status_abbrev(unsigned char sha1[20])
 643 {
 644         return find_unique_abbrev(sha1, DEFAULT_ABBREV);
 645 }
 646
 647 static void print_ok_ref_status(struct ref *ref, int porcelain)
 648 {
 649         if (ref->deletion)
 650                 print_ref_status('-', "[deleted]", ref, NULL, NULL, porcelain);
 651         else if (is_null_sha1(ref->old_sha1))
 652                 print_ref_status('*',
 653                         (!prefixcmp(ref->name, "refs/tags/") ? "[new tag]" :
 654                         "[new branch]"),
 655                         ref, ref->peer_ref, NULL, porcelain);
 656         else {
 657                 char quickref[84];
 658                 char type;
 659                 const char *msg;
 660
 661                 strcpy(quickref, status_abbrev(ref->old_sha1));
 662                 if (ref->requires_force) {
 663                         strcat(quickref, "...");
 664                         type = '+';
 665                         msg = "forced update";
 666                 } else {
 667                         strcat(quickref, "..");
 668                         type = ' ';
 669                         msg = NULL;
 670                 }
 671                 strcat(quickref, status_abbrev(ref->new_sha1));
 672
 673                 print_ref_status(type, quickref, ref, ref->peer_ref, msg, porcelain);
 674         }
 675 }
 676
 677 static int print_one_push_status(struct ref *ref, const char *dest, int count, int porcelain)
 678 {
 679         if (!count)
 680                 fprintf(porcelain ? stdout : stderr, "To %s\n", dest);
 681
 682         switch(ref->status) {
 683         case REF_STATUS_NONE:
 684                 print_ref_status('X', "[no match]", ref, NULL, NULL, porcelain);
 685                 break;
 686         case REF_STATUS_REJECT_NODELETE:
 687                 print_ref_status('!', "[rejected]", ref, NULL,
 688                                                  "remote does not support deleting refs", porcelain);
 689                 break;
 690         case REF_STATUS_UPTODATE:
 691                 print_ref_status('=', "[up to date]", ref,
 692                                                  ref->peer_ref, NULL, porcelain);
 693                 break;
 694         case REF_STATUS_REJECT_NONFASTFORWARD:
 695                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 696                                                  "non-fast-forward", porcelain);
 697                 break;
 698         case REF_STATUS_REJECT_ALREADY_EXISTS:
 699                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 700                                                  "already exists", porcelain);
 701                 break;
 702         case REF_STATUS_REMOTE_REJECT:
 703                 print_ref_status('!', "[remote rejected]", ref,
 704                                                  ref->deletion ? NULL : ref->peer_ref,
 705                                                  ref->remote_status, porcelain);
 706                 break;
 707         case REF_STATUS_EXPECTING_REPORT:
 708                 print_ref_status('!', "[remote failure]", ref,
 709                                                  ref->deletion ? NULL : ref->peer_ref,
 710                                                  "remote failed to report status", porcelain);
 711                 break;
 712         case REF_STATUS_OK:
 713                 print_ok_ref_status(ref, porcelain);
 714                 break;
 715         }
 716
 717         return 1;
 718 }
 719
 720 void transport_print_push_status(const char *dest, struct ref *refs,
 721                                   int verbose, int porcelain, unsigned int *reject_reasons)
 722 {
 723         struct ref *ref;
 724         int n = 0;
 725         unsigned char head_sha1[20];
 726         char *head;
 727
 728         head = resolve_refdup("HEAD", head_sha1, 1, NULL);
 729
 730         if (verbose) {
 731                 for (ref = refs; ref; ref = ref->next)
 732                         if (ref->status == REF_STATUS_UPTODATE)
 733                                 n += print_one_push_status(ref, dest, n, porcelain);
 734         }
 735
 736         for (ref = refs; ref; ref = ref->next)
 737                 if (ref->status == REF_STATUS_OK)
 738                         n += print_one_push_status(ref, dest, n, porcelain);
 739
 740         *reject_reasons = 0;
 741         for (ref = refs; ref; ref = ref->next) {
 742                 if (ref->status != REF_STATUS_NONE &&
 743                     ref->status != REF_STATUS_UPTODATE &&
 744                     ref->status != REF_STATUS_OK)
 745                         n += print_one_push_status(ref, dest, n, porcelain);
 746                 if (ref->status == REF_STATUS_REJECT_NONFASTFORWARD) {
 747                         if (!strcmp(head, ref->name))
 748                                 *reject_reasons |= REJECT_NON_FF_HEAD;
 749                         else
 750                                 *reject_reasons |= REJECT_NON_FF_OTHER;
 751                 } else if (ref->status == REF_STATUS_REJECT_ALREADY_EXISTS) {
 752                         *reject_reasons |= REJECT_ALREADY_EXISTS;
 753                 }
 754         }
 755 }
 756
 757 void transport_verify_remote_names(int nr_heads, const char **heads)
 758 {
 759         int i;
 760
 761         for (i = 0; i < nr_heads; i++) {
 762                 const char *local = heads[i];
 763                 const char *remote = strrchr(heads[i], ':');
 764
 765                 if (*local == '+')
 766                         local++;
 767
 768                 /* A matching refspec is okay.  */
 769                 if (remote == local && remote[1] == '\0')
 770                         continue;
 771
 772                 remote = remote ? (remote + 1) : local;
 773                 if (check_refname_format(remote,
 774                                 REFNAME_ALLOW_ONELEVEL|REFNAME_REFSPEC_PATTERN))
 775                         die("remote part of refspec is not a valid name in %s",
 776                                 heads[i]);
 777         }
 778 }
 779
 780 static int git_transport_push(struct transport *transport, struct ref *remote_refs, int flags)
 781 {
 782         struct git_transport_data *data = transport->data;
 783         struct send_pack_args args;
 784         int ret;
 785
 786         if (!data->got_remote_heads) {
 787                 struct ref *tmp_refs;
 788                 connect_setup(transport, 1, 0);
 789
 790                 get_remote_heads(data->fd[0], &tmp_refs, REF_NORMAL, NULL);
 791                 data->got_remote_heads = 1;
 792         }
 793
 794         memset(&args, 0, sizeof(args));
 795         args.send_mirror = !!(flags & TRANSPORT_PUSH_MIRROR);
 796         args.force_update = !!(flags & TRANSPORT_PUSH_FORCE);
 797         args.use_thin_pack = data->options.thin;
 798         args.verbose = (transport->verbose > 0);
 799         args.quiet = (transport->verbose < 0);
 800         args.progress = transport->progress;
 801         args.dry_run = !!(flags & TRANSPORT_PUSH_DRY_RUN);
 802         args.porcelain = !!(flags & TRANSPORT_PUSH_PORCELAIN);
 803
 804         ret = send_pack(&args, data->fd, data->conn, remote_refs,
 805                         &data->extra_have);
 806
 807         close(data->fd[1]);
 808         close(data->fd[0]);
 809         ret |= finish_connect(data->conn);
 810         data->conn = NULL;
 811         data->got_remote_heads = 0;
 812
 813         return ret;
 814 }
 815
 816 static int connect_git(struct transport *transport, const char *name,
 817                        const char *executable, int fd[2])
 818 {
 819         struct git_transport_data *data = transport->data;
 820         data->conn = git_connect(data->fd, transport->url,
 821                                  executable, 0);
 822         fd[0] = data->fd[0];
 823         fd[1] = data->fd[1];
 824         return 0;
 825 }
 826
 827 static int disconnect_git(struct transport *transport)
 828 {
 829         struct git_transport_data *data = transport->data;
 830         if (data->conn) {
 831                 if (data->got_remote_heads)
 832                         packet_flush(data->fd[1]);
 833                 close(data->fd[0]);
 834                 close(data->fd[1]);
 835                 finish_connect(data->conn);
 836         }
 837
 838         free(data);
 839         return 0;
 840 }
 841
 842 void transport_take_over(struct transport *transport,
 843                          struct child_process *child)
 844 {
 845         struct git_transport_data *data;
 846
 847         if (!transport->smart_options)
 848                 die("Bug detected: Taking over transport requires non-NULL "
 849                     "smart_options field.");
 850
 851         data = xcalloc(1, sizeof(*data));
 852         data->options = *transport->smart_options;
 853         data->conn = child;
 854         data->fd[0] = data->conn->out;
 855         data->fd[1] = data->conn->in;
 856         data->got_remote_heads = 0;
 857         transport->data = data;
 858
 859         transport->set_option = NULL;
 860         transport->get_refs_list = get_refs_via_connect;
 861         transport->fetch = fetch_refs_via_pack;
 862         transport->push = NULL;
 863         transport->push_refs = git_transport_push;
 864         transport->disconnect = disconnect_git;
 865         transport->smart_options = &(data->options);
 866 }
 867
 868 static int is_local(const char *url)
 869 {
 870         const char *colon = strchr(url, ':');
 871         const char *slash = strchr(url, '/');
 872         return !colon || (slash && slash < colon) ||
 873                 has_dos_drive_prefix(url);
 874 }
 875
 876 static int is_file(const char *url)
 877 {
 878         struct stat buf;
 879         if (stat(url, &buf))
 880                 return 0;
 881         return S_ISREG(buf.st_mode);
 882 }
 883
 884 static int external_specification_len(const char *url)
 885 {
 886         return strchr(url, ':') - url;
 887 }
 888
 889 struct transport *transport_get(struct remote *remote, const char *url)
 890 {
 891         const char *helper;
 892         struct transport *ret = xcalloc(1, sizeof(*ret));
 893
 894         ret->progress = isatty(2);
 895
 896         if (!remote)
 897                 die("No remote provided to transport_get()");
 898
 899         ret->got_remote_refs = 0;
 900         ret->remote = remote;
 901         helper = remote->foreign_vcs;
 902
 903         if (!url && remote->url)
 904                 url = remote->url[0];
 905         ret->url = url;
 906
 907         /* maybe it is a foreign URL? */
 908         if (url) {
 909                 const char *p = url;
 910
 911                 while (is_urlschemechar(p == url, *p))
 912                         p++;
 913                 if (!prefixcmp(p, "::"))
 914                         helper = xstrndup(url, p - url);
 915         }
 916
 917         if (helper) {
 918                 transport_helper_init(ret, helper);
 919         } else if (!prefixcmp(url, "rsync:")) {
 920                 ret->get_refs_list = get_refs_via_rsync;
 921                 ret->fetch = fetch_objs_via_rsync;
 922                 ret->push = rsync_transport_push;
 923                 ret->smart_options = NULL;
 924         } else if (is_local(url) && is_file(url) && is_bundle(url, 1)) {
 925                 struct bundle_transport_data *data = xcalloc(1, sizeof(*data));
 926                 ret->data = data;
 927                 ret->get_refs_list = get_refs_from_bundle;
 928                 ret->fetch = fetch_refs_from_bundle;
 929                 ret->disconnect = close_bundle;
 930                 ret->smart_options = NULL;
 931         } else if (!is_url(url)
 932                 || !prefixcmp(url, "file://")
 933                 || !prefixcmp(url, "git://")
 934                 || !prefixcmp(url, "ssh://")
 935                 || !prefixcmp(url, "git+ssh://")
 936                 || !prefixcmp(url, "ssh+git://")) {
 937                 /* These are builtin smart transports. */
 938                 struct git_transport_data *data = xcalloc(1, sizeof(*data));
 939                 ret->data = data;
 940                 ret->set_option = NULL;
 941                 ret->get_refs_list = get_refs_via_connect;
 942                 ret->fetch = fetch_refs_via_pack;
 943                 ret->push_refs = git_transport_push;
 944                 ret->connect = connect_git;
 945                 ret->disconnect = disconnect_git;
 946                 ret->smart_options = &(data->options);
 947
 948                 data->conn = NULL;
 949                 data->got_remote_heads = 0;
 950         } else {
 951                 /* Unknown protocol in URL. Pass to external handler. */
 952                 int len = external_specification_len(url);
 953                 char *handler = xmalloc(len + 1);
 954                 handler[len] = 0;
 955                 strncpy(handler, url, len);
 956                 transport_helper_init(ret, handler);
 957         }
 958
 959         if (ret->smart_options) {
 960                 ret->smart_options->thin = 1;
 961                 ret->smart_options->uploadpack = "git-upload-pack";
 962                 if (remote->uploadpack)
 963                         ret->smart_options->uploadpack = remote->uploadpack;
 964                 ret->smart_options->receivepack = "git-receive-pack";
 965                 if (remote->receivepack)
 966                         ret->smart_options->receivepack = remote->receivepack;
 967         }
 968
 969         return ret;
 970 }
 971
 972 int transport_set_option(struct transport *transport,
 973                          const char *name, const char *value)
 974 {
 975         int git_reports = 1, protocol_reports = 1;
 976
 977         if (transport->smart_options)
 978                 git_reports = set_git_option(transport->smart_options,
 979                                              name, value);
 980
 981         if (transport->set_option)
 982                 protocol_reports = transport->set_option(transport, name,
 983                                                         value);
 984
 985         /* If either report is 0, report 0 (success). */
 986         if (!git_reports || !protocol_reports)
 987                 return 0;
 988         /* If either reports -1 (invalid value), report -1. */
 989         if ((git_reports == -1) || (protocol_reports == -1))
 990                 return -1;
 991         /* Otherwise if both report unknown, report unknown. */
 992         return 1;
 993 }
 994
 995 void transport_set_verbosity(struct transport *transport, int verbosity,
 996         int force_progress)
 997 {
 998         if (verbosity >= 1)
 999                 transport->verbose = verbosity <= 3 ? verbosity : 3;
1000         if (verbosity < 0)
1001                 transport->verbose = -1;
1002
1003         /**
1004          * Rules used to determine whether to report progress (processing aborts
1005          * when a rule is satisfied):
1006          *
1007          *   . Report progress, if force_progress is 1 (ie. --progress).
1008          *   . Don't report progress, if force_progress is 0 (ie. --no-progress).
1009          *   . Don't report progress, if verbosity < 0 (ie. -q/--quiet ).
1010          *   . Report progress if isatty(2) is 1.
1011          **/
1012         if (force_progress >= 0)
1013                 transport->progress = !!force_progress;
1014         else
1015                 transport->progress = verbosity >= 0 && isatty(2);
1016 }
1017
1018 static void die_with_unpushed_submodules(struct string_list *needs_pushing)
1019 {
1020         int i;
1021
1022         fprintf(stderr, "The following submodule paths contain changes that can\n"
1023                         "not be found on any remote:\n");
1024         for (i = 0; i < needs_pushing->nr; i++)
1025                 printf("  %s\n", needs_pushing->items[i].string);
1026         fprintf(stderr, "\nPlease try\n\n"
1027                         "       git push --recurse-submodules=on-demand\n\n"
1028                         "or cd to the path and use\n\n"
1029                         "       git push\n\n"
1030                         "to push them to a remote.\n\n");
1031
1032         string_list_clear(needs_pushing, 0);
1033
1034         die("Aborting.");
1035 }
1036
1037 static int run_pre_push_hook(struct transport *transport,
1038                              struct ref *remote_refs)
1039 {
1040         int ret = 0, x;
1041         struct ref *r;
1042         struct child_process proc;
1043         struct strbuf buf;
1044         const char *argv[4];
1045
1046         if (!(argv[0] = find_hook("pre-push")))
1047                 return 0;
1048
1049         argv[1] = transport->remote->name;
1050         argv[2] = transport->url;
1051         argv[3] = NULL;
1052
1053         memset(&proc, 0, sizeof(proc));
1054         proc.argv = argv;
1055         proc.in = -1;
1056
1057         if (start_command(&proc)) {
1058                 finish_command(&proc);
1059                 return -1;
1060         }
1061
1062         strbuf_init(&buf, 256);
1063
1064         for (r = remote_refs; r; r = r->next) {
1065                 if (!r->peer_ref) continue;
1066                 if (r->status == REF_STATUS_REJECT_NONFASTFORWARD) continue;
1067                 if (r->status == REF_STATUS_UPTODATE) continue;
1068
1069                 strbuf_reset(&buf);
1070                 strbuf_addf( &buf, "%s %s %s %s\n",
1071                          r->peer_ref->name, sha1_to_hex(r->new_sha1),
1072                          r->name, sha1_to_hex(r->old_sha1));
1073
1074                 if (write_in_full(proc.in, buf.buf, buf.len) != buf.len) {
1075                         ret = -1;
1076                         break;
1077                 }
1078         }
1079
1080         strbuf_release(&buf);
1081
1082         x = close(proc.in);
1083         if (!ret)
1084                 ret = x;
1085
1086         x = finish_command(&proc);
1087         if (!ret)
1088                 ret = x;
1089
1090         return ret;
1091 }
1092
1093 int transport_push(struct transport *transport,
1094                    int refspec_nr, const char **refspec, int flags,
1095                    unsigned int *reject_reasons)
1096 {
1097         *reject_reasons = 0;
1098         transport_verify_remote_names(refspec_nr, refspec);
1099
1100         if (transport->push) {
1101                 /* Maybe FIXME. But no important transport uses this case. */
1102                 if (flags & TRANSPORT_PUSH_SET_UPSTREAM)
1103                         die("This transport does not support using --set-upstream");
1104
1105                 return transport->push(transport, refspec_nr, refspec, flags);
1106         } else if (transport->push_refs) {
1107                 struct ref *remote_refs =
1108                         transport->get_refs_list(transport, 1);
1109                 struct ref *local_refs = get_local_heads();
1110                 int match_flags = MATCH_REFS_NONE;
1111                 int verbose = (transport->verbose > 0);
1112                 int quiet = (transport->verbose < 0);
1113                 int porcelain = flags & TRANSPORT_PUSH_PORCELAIN;
1114                 int pretend = flags & TRANSPORT_PUSH_DRY_RUN;
1115                 int push_ret, ret, err;
1116
1117                 if (flags & TRANSPORT_PUSH_ALL)
1118                         match_flags |= MATCH_REFS_ALL;
1119                 if (flags & TRANSPORT_PUSH_MIRROR)
1120                         match_flags |= MATCH_REFS_MIRROR;
1121                 if (flags & TRANSPORT_PUSH_PRUNE)
1122                         match_flags |= MATCH_REFS_PRUNE;
1123
1124                 if (match_push_refs(local_refs, &remote_refs,
1125                                     refspec_nr, refspec, match_flags)) {
1126                         return -1;
1127                 }
1128
1129                 set_ref_status_for_push(remote_refs,
1130                         flags & TRANSPORT_PUSH_MIRROR,
1131                         flags & TRANSPORT_PUSH_FORCE);
1132
1133                 if (!(flags & TRANSPORT_PUSH_NO_HOOK))
1134                         if (run_pre_push_hook(transport, remote_refs))
1135                                 return -1;
1136
1137                 if ((flags & TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND) && !is_bare_repository()) {
1138                         struct ref *ref = remote_refs;
1139                         for (; ref; ref = ref->next)
1140                                 if (!is_null_sha1(ref->new_sha1) &&
1141                                     !push_unpushed_submodules(ref->new_sha1,
1142                                             transport->remote->name))
1143                                     die ("Failed to push all needed submodules!");
1144                 }
1145
1146                 if ((flags & (TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND |
1147                               TRANSPORT_RECURSE_SUBMODULES_CHECK)) && !is_bare_repository()) {
1148                         struct ref *ref = remote_refs;
1149                         struct string_list needs_pushing;
1150
1151                         memset(&needs_pushing, 0, sizeof(struct string_list));
1152                         needs_pushing.strdup_strings = 1;
1153                         for (; ref; ref = ref->next)
1154                                 if (!is_null_sha1(ref->new_sha1) &&
1155                                     find_unpushed_submodules(ref->new_sha1,
1156                                             transport->remote->name, &needs_pushing))
1157                                         die_with_unpushed_submodules(&needs_pushing);
1158                 }
1159
1160                 push_ret = transport->push_refs(transport, remote_refs, flags);
1161                 err = push_had_errors(remote_refs);
1162                 ret = push_ret | err;
1163
1164                 if (!quiet || err)
1165                         transport_print_push_status(transport->url, remote_refs,
1166                                         verbose | porcelain, porcelain,
1167                                         reject_reasons);
1168
1169                 if (flags & TRANSPORT_PUSH_SET_UPSTREAM)
1170                         set_upstreams(transport, remote_refs, pretend);
1171
1172                 if (!(flags & TRANSPORT_PUSH_DRY_RUN)) {
1173                         struct ref *ref;
1174                         for (ref = remote_refs; ref; ref = ref->next)
1175                                 transport_update_tracking_ref(transport->remote, ref, verbose);
1176                 }
1177
1178                 if (porcelain && !push_ret)
1179                         puts("Done");
1180                 else if (!quiet && !ret && !transport_refs_pushed(remote_refs))
1181                         fprintf(stderr, "Everything up-to-date\n");
1182
1183                 return ret;
1184         }
1185         return 1;
1186 }
1187
1188 const struct ref *transport_get_remote_refs(struct transport *transport)
1189 {
1190         if (!transport->got_remote_refs) {
1191                 transport->remote_refs = transport->get_refs_list(transport, 0);
1192                 transport->got_remote_refs = 1;
1193         }
1194
1195         return transport->remote_refs;
1196 }
1197
1198 int transport_fetch_refs(struct transport *transport, struct ref *refs)
1199 {
1200         int rc;
1201         int nr_heads = 0, nr_alloc = 0, nr_refs = 0;
1202         struct ref **heads = NULL;
1203         struct ref *rm;
1204
1205         for (rm = refs; rm; rm = rm->next) {
1206                 nr_refs++;
1207                 if (rm->peer_ref &&
1208                     !is_null_sha1(rm->old_sha1) &&
1209                     !hashcmp(rm->peer_ref->old_sha1, rm->old_sha1))
1210                         continue;
1211                 ALLOC_GROW(heads, nr_heads + 1, nr_alloc);
1212                 heads[nr_heads++] = rm;
1213         }
1214
1215         if (!nr_heads) {
1216                 /*
1217                  * When deepening of a shallow repository is requested,
1218                  * then local and remote refs are likely to still be equal.
1219                  * Just feed them all to the fetch method in that case.
1220                  * This condition shouldn't be met in a non-deepening fetch
1221                  * (see builtin-fetch.c:quickfetch()).
1222                  */
1223                 heads = xmalloc(nr_refs * sizeof(*heads));
1224                 for (rm = refs; rm; rm = rm->next)
1225                         heads[nr_heads++] = rm;
1226         }
1227
1228         rc = transport->fetch(transport, nr_heads, heads);
1229
1230         free(heads);
1231         return rc;
1232 }
1233
1234 void transport_unlock_pack(struct transport *transport)
1235 {
1236         if (transport->pack_lockfile) {
1237                 unlink_or_warn(transport->pack_lockfile);
1238                 free(transport->pack_lockfile);
1239                 transport->pack_lockfile = NULL;
1240         }
1241 }
1242
1243 int transport_connect(struct transport *transport, const char *name,
1244                       const char *exec, int fd[2])
1245 {
1246         if (transport->connect)
1247                 return transport->connect(transport, name, exec, fd);
1248         else
1249                 die("Operation not supported by protocol");
1250 }
1251
1252 int transport_disconnect(struct transport *transport)
1253 {
1254         int ret = 0;
1255         if (transport->disconnect)
1256                 ret = transport->disconnect(transport);
1257         free(transport);
1258         return ret;
1259 }
1260
1261 /*
1262  * Strip username (and password) from a URL and return
1263  * it in a newly allocated string.
1264  */
1265 char *transport_anonymize_url(const char *url)
1266 {
1267         char *anon_url, *scheme_prefix, *anon_part;
1268         size_t anon_len, prefix_len = 0;
1269
1270         anon_part = strchr(url, '@');
1271         if (is_local(url) || !anon_part)
1272                 goto literal_copy;
1273
1274         anon_len = strlen(++anon_part);
1275         scheme_prefix = strstr(url, "://");
1276         if (!scheme_prefix) {
1277                 if (!strchr(anon_part, ':'))
1278                         /* cannot be "me@there:/path/name" */
1279                         goto literal_copy;
1280         } else {
1281                 const char *cp;
1282                 /* make sure scheme is reasonable */
1283                 for (cp = url; cp < scheme_prefix; cp++) {
1284                         switch (*cp) {
1285                                 /* RFC 1738 2.1 */
1286                         case '+': case '.': case '-':
1287                                 break; /* ok */
1288                         default:
1289                                 if (isalnum(*cp))
1290                                         break;
1291                                 /* it isn't */
1292                                 goto literal_copy;
1293                         }
1294                 }
1295                 /* @ past the first slash does not count */
1296                 cp = strchr(scheme_prefix + 3, '/');
1297                 if (cp && cp < anon_part)
1298                         goto literal_copy;
1299                 prefix_len = scheme_prefix - url + 3;
1300         }
1301         anon_url = xcalloc(1, 1 + prefix_len + anon_len);
1302         memcpy(anon_url, url, prefix_len);
1303         memcpy(anon_url + prefix_len, anon_part, anon_len);
1304         return anon_url;
1305 literal_copy:
1306         return xstrdup(url);
1307 }
1308
1309 struct alternate_refs_data {
1310         alternate_ref_fn *fn;
1311         void *data;
1312 };
1313
1314 static int refs_from_alternate_cb(struct alternate_object_database *e,
1315                                   void *data)
1316 {
1317         char *other;
1318         size_t len;
1319         struct remote *remote;
1320         struct transport *transport;
1321         const struct ref *extra;
1322         struct alternate_refs_data *cb = data;
1323
1324         e->name[-1] = '\0';
1325         other = xstrdup(real_path(e->base));
1326         e->name[-1] = '/';
1327         len = strlen(other);
1328
1329         while (other[len-1] == '/')
1330                 other[--len] = '\0';
1331         if (len < 8 || memcmp(other + len - 8, "/objects", 8))
1332                 return 0;
1333         /* Is this a git repository with refs? */
1334         memcpy(other + len - 8, "/refs", 6);
1335         if (!is_directory(other))
1336                 return 0;
1337         other[len - 8] = '\0';
1338         remote = remote_get(other);
1339         transport = transport_get(remote, other);
1340         for (extra = transport_get_remote_refs(transport);
1341              extra;
1342              extra = extra->next)
1343                 cb->fn(extra, cb->data);
1344         transport_disconnect(transport);
1345         free(other);
1346         return 0;
1347 }
1348
1349 void for_each_alternate_ref(alternate_ref_fn fn, void *data)
1350 {
1351         struct alternate_refs_data cb;
1352         cb.fn = fn;
1353         cb.data = data;
1354         foreach_alt_odb(refs_from_alternate_cb, &cb);
1355 }