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
  12 /* rsync support */
  13
  14 /*
  15  * We copy packed-refs and refs/ into a temporary file, then read the
  16  * loose refs recursively (sorting whenever possible), and then inserting
  17  * those packed refs that are not yet in the list (not validating, but
  18  * assuming that the file is sorted).
  19  *
  20  * Appears refactoring this from refs.c is too cumbersome.
  21  */
  22
  23 static int str_cmp(const void *a, const void *b)
  24 {
  25         const char *s1 = a;
  26         const char *s2 = b;
  27
  28         return strcmp(s1, s2);
  29 }
  30
  31 /* path->buf + name_offset is expected to point to "refs/" */
  32
  33 static int read_loose_refs(struct strbuf *path, int name_offset,
  34                 struct ref **tail)
  35 {
  36         DIR *dir = opendir(path->buf);
  37         struct dirent *de;
  38         struct {
  39                 char **entries;
  40                 int nr, alloc;
  41         } list;
  42         int i, pathlen;
  43
  44         if (!dir)
  45                 return -1;
  46
  47         memset (&list, 0, sizeof(list));
  48
  49         while ((de = readdir(dir))) {
  50                 if (is_dot_or_dotdot(de->d_name))
  51                         continue;
  52                 ALLOC_GROW(list.entries, list.nr + 1, list.alloc);
  53                 list.entries[list.nr++] = xstrdup(de->d_name);
  54         }
  55         closedir(dir);
  56
  57         /* sort the list */
  58
  59         qsort(list.entries, list.nr, sizeof(char *), str_cmp);
  60
  61         pathlen = path->len;
  62         strbuf_addch(path, '/');
  63
  64         for (i = 0; i < list.nr; i++, strbuf_setlen(path, pathlen + 1)) {
  65                 strbuf_addstr(path, list.entries[i]);
  66                 if (read_loose_refs(path, name_offset, tail)) {
  67                         int fd = open(path->buf, O_RDONLY);
  68                         char buffer[40];
  69                         struct ref *next;
  70
  71                         if (fd < 0)
  72                                 continue;
  73                         next = alloc_ref(path->buf + name_offset);
  74                         if (read_in_full(fd, buffer, 40) != 40 ||
  75                                         get_sha1_hex(buffer, next->old_sha1)) {
  76                                 close(fd);
  77                                 free(next);
  78                                 continue;
  79                         }
  80                         close(fd);
  81                         (*tail)->next = next;
  82                         *tail = next;
  83                 }
  84         }
  85         strbuf_setlen(path, pathlen);
  86
  87         for (i = 0; i < list.nr; i++)
  88                 free(list.entries[i]);
  89         free(list.entries);
  90
  91         return 0;
  92 }
  93
  94 /* insert the packed refs for which no loose refs were found */
  95
  96 static void insert_packed_refs(const char *packed_refs, struct ref **list)
  97 {
  98         FILE *f = fopen(packed_refs, "r");
  99         static char buffer[PATH_MAX];
 100
 101         if (!f)
 102                 return;
 103
 104         for (;;) {
 105                 int cmp = cmp, len;
 106
 107                 if (!fgets(buffer, sizeof(buffer), f)) {
 108                         fclose(f);
 109                         return;
 110                 }
 111
 112                 if (hexval(buffer[0]) > 0xf)
 113                         continue;
 114                 len = strlen(buffer);
 115                 if (len && buffer[len - 1] == '\n')
 116                         buffer[--len] = '\0';
 117                 if (len < 41)
 118                         continue;
 119                 while ((*list)->next &&
 120                                 (cmp = strcmp(buffer + 41,
 121                                       (*list)->next->name)) > 0)
 122                         list = &(*list)->next;
 123                 if (!(*list)->next || cmp < 0) {
 124                         struct ref *next = alloc_ref(buffer + 41);
 125                         buffer[40] = '\0';
 126                         if (get_sha1_hex(buffer, next->old_sha1)) {
 127                                 warning ("invalid SHA-1: %s", buffer);
 128                                 free(next);
 129                                 continue;
 130                         }
 131                         next->next = (*list)->next;
 132                         (*list)->next = next;
 133                         list = &(*list)->next;
 134                 }
 135         }
 136 }
 137
 138 static const char *rsync_url(const char *url)
 139 {
 140         return prefixcmp(url, "rsync://") ? skip_prefix(url, "rsync:") : url;
 141 }
 142
 143 static struct ref *get_refs_via_rsync(struct transport *transport, int for_push)
 144 {
 145         struct strbuf buf = STRBUF_INIT, temp_dir = STRBUF_INIT;
 146         struct ref dummy, *tail = &dummy;
 147         struct child_process rsync;
 148         const char *args[5];
 149         int temp_dir_len;
 150
 151         if (for_push)
 152                 return NULL;
 153
 154         /* copy the refs to the temporary directory */
 155
 156         strbuf_addstr(&temp_dir, git_path("rsync-refs-XXXXXX"));
 157         if (!mkdtemp(temp_dir.buf))
 158                 die_errno ("Could not make temporary directory");
 159         temp_dir_len = temp_dir.len;
 160
 161         strbuf_addstr(&buf, rsync_url(transport->url));
 162         strbuf_addstr(&buf, "/refs");
 163
 164         memset(&rsync, 0, sizeof(rsync));
 165         rsync.argv = args;
 166         rsync.stdout_to_stderr = 1;
 167         args[0] = "rsync";
 168         args[1] = (transport->verbose > 0) ? "-rv" : "-r";
 169         args[2] = buf.buf;
 170         args[3] = temp_dir.buf;
 171         args[4] = NULL;
 172
 173         if (run_command(&rsync))
 174                 die ("Could not run rsync to get refs");
 175
 176         strbuf_reset(&buf);
 177         strbuf_addstr(&buf, rsync_url(transport->url));
 178         strbuf_addstr(&buf, "/packed-refs");
 179
 180         args[2] = buf.buf;
 181
 182         if (run_command(&rsync))
 183                 die ("Could not run rsync to get refs");
 184
 185         /* read the copied refs */
 186
 187         strbuf_addstr(&temp_dir, "/refs");
 188         read_loose_refs(&temp_dir, temp_dir_len + 1, &tail);
 189         strbuf_setlen(&temp_dir, temp_dir_len);
 190
 191         tail = &dummy;
 192         strbuf_addstr(&temp_dir, "/packed-refs");
 193         insert_packed_refs(temp_dir.buf, &tail);
 194         strbuf_setlen(&temp_dir, temp_dir_len);
 195
 196         if (remove_dir_recursively(&temp_dir, 0))
 197                 warning ("Error removing temporary directory %s.",
 198                                 temp_dir.buf);
 199
 200         strbuf_release(&buf);
 201         strbuf_release(&temp_dir);
 202
 203         return dummy.next;
 204 }
 205
 206 static int fetch_objs_via_rsync(struct transport *transport,
 207                                 int nr_objs, struct ref **to_fetch)
 208 {
 209         struct strbuf buf = STRBUF_INIT;
 210         struct child_process rsync;
 211         const char *args[8];
 212         int result;
 213
 214         strbuf_addstr(&buf, rsync_url(transport->url));
 215         strbuf_addstr(&buf, "/objects/");
 216
 217         memset(&rsync, 0, sizeof(rsync));
 218         rsync.argv = args;
 219         rsync.stdout_to_stderr = 1;
 220         args[0] = "rsync";
 221         args[1] = (transport->verbose > 0) ? "-rv" : "-r";
 222         args[2] = "--ignore-existing";
 223         args[3] = "--exclude";
 224         args[4] = "info";
 225         args[5] = buf.buf;
 226         args[6] = get_object_directory();
 227         args[7] = NULL;
 228
 229         /* NEEDSWORK: handle one level of alternates */
 230         result = run_command(&rsync);
 231
 232         strbuf_release(&buf);
 233
 234         return result;
 235 }
 236
 237 static int write_one_ref(const char *name, const unsigned char *sha1,
 238                 int flags, void *data)
 239 {
 240         struct strbuf *buf = data;
 241         int len = buf->len;
 242         FILE *f;
 243
 244         /* when called via for_each_ref(), flags is non-zero */
 245         if (flags && prefixcmp(name, "refs/heads/") &&
 246                         prefixcmp(name, "refs/tags/"))
 247                 return 0;
 248
 249         strbuf_addstr(buf, name);
 250         if (safe_create_leading_directories(buf->buf) ||
 251                         !(f = fopen(buf->buf, "w")) ||
 252                         fprintf(f, "%s\n", sha1_to_hex(sha1)) < 0 ||
 253                         fclose(f))
 254                 return error("problems writing temporary file %s", buf->buf);
 255         strbuf_setlen(buf, len);
 256         return 0;
 257 }
 258
 259 static int write_refs_to_temp_dir(struct strbuf *temp_dir,
 260                 int refspec_nr, const char **refspec)
 261 {
 262         int i;
 263
 264         for (i = 0; i < refspec_nr; i++) {
 265                 unsigned char sha1[20];
 266                 char *ref;
 267
 268                 if (dwim_ref(refspec[i], strlen(refspec[i]), sha1, &ref) != 1)
 269                         return error("Could not get ref %s", refspec[i]);
 270
 271                 if (write_one_ref(ref, sha1, 0, temp_dir)) {
 272                         free(ref);
 273                         return -1;
 274                 }
 275                 free(ref);
 276         }
 277         return 0;
 278 }
 279
 280 static int rsync_transport_push(struct transport *transport,
 281                 int refspec_nr, const char **refspec, int flags)
 282 {
 283         struct strbuf buf = STRBUF_INIT, temp_dir = STRBUF_INIT;
 284         int result = 0, i;
 285         struct child_process rsync;
 286         const char *args[10];
 287
 288         if (flags & TRANSPORT_PUSH_MIRROR)
 289                 return error("rsync transport does not support mirror mode");
 290
 291         /* first push the objects */
 292
 293         strbuf_addstr(&buf, rsync_url(transport->url));
 294         strbuf_addch(&buf, '/');
 295
 296         memset(&rsync, 0, sizeof(rsync));
 297         rsync.argv = args;
 298         rsync.stdout_to_stderr = 1;
 299         i = 0;
 300         args[i++] = "rsync";
 301         args[i++] = "-a";
 302         if (flags & TRANSPORT_PUSH_DRY_RUN)
 303                 args[i++] = "--dry-run";
 304         if (transport->verbose > 0)
 305                 args[i++] = "-v";
 306         args[i++] = "--ignore-existing";
 307         args[i++] = "--exclude";
 308         args[i++] = "info";
 309         args[i++] = get_object_directory();
 310         args[i++] = buf.buf;
 311         args[i++] = NULL;
 312
 313         if (run_command(&rsync))
 314                 return error("Could not push objects to %s",
 315                                 rsync_url(transport->url));
 316
 317         /* copy the refs to the temporary directory; they could be packed. */
 318
 319         strbuf_addstr(&temp_dir, git_path("rsync-refs-XXXXXX"));
 320         if (!mkdtemp(temp_dir.buf))
 321                 die_errno ("Could not make temporary directory");
 322         strbuf_addch(&temp_dir, '/');
 323
 324         if (flags & TRANSPORT_PUSH_ALL) {
 325                 if (for_each_ref(write_one_ref, &temp_dir))
 326                         return -1;
 327         } else if (write_refs_to_temp_dir(&temp_dir, refspec_nr, refspec))
 328                 return -1;
 329
 330         i = 2;
 331         if (flags & TRANSPORT_PUSH_DRY_RUN)
 332                 args[i++] = "--dry-run";
 333         if (!(flags & TRANSPORT_PUSH_FORCE))
 334                 args[i++] = "--ignore-existing";
 335         args[i++] = temp_dir.buf;
 336         args[i++] = rsync_url(transport->url);
 337         args[i++] = NULL;
 338         if (run_command(&rsync))
 339                 result = error("Could not push to %s",
 340                                 rsync_url(transport->url));
 341
 342         if (remove_dir_recursively(&temp_dir, 0))
 343                 warning ("Could not remove temporary directory %s.",
 344                                 temp_dir.buf);
 345
 346         strbuf_release(&buf);
 347         strbuf_release(&temp_dir);
 348
 349         return result;
 350 }
 351
 352 struct bundle_transport_data {
 353         int fd;
 354         struct bundle_header header;
 355 };
 356
 357 static struct ref *get_refs_from_bundle(struct transport *transport, int for_push)
 358 {
 359         struct bundle_transport_data *data = transport->data;
 360         struct ref *result = NULL;
 361         int i;
 362
 363         if (for_push)
 364                 return NULL;
 365
 366         if (data->fd > 0)
 367                 close(data->fd);
 368         data->fd = read_bundle_header(transport->url, &data->header);
 369         if (data->fd < 0)
 370                 die ("Could not read bundle '%s'.", transport->url);
 371         for (i = 0; i < data->header.references.nr; i++) {
 372                 struct ref_list_entry *e = data->header.references.list + i;
 373                 struct ref *ref = alloc_ref(e->name);
 374                 hashcpy(ref->old_sha1, e->sha1);
 375                 ref->next = result;
 376                 result = ref;
 377         }
 378         return result;
 379 }
 380
 381 static int fetch_refs_from_bundle(struct transport *transport,
 382                                int nr_heads, struct ref **to_fetch)
 383 {
 384         struct bundle_transport_data *data = transport->data;
 385         return unbundle(&data->header, data->fd);
 386 }
 387
 388 static int close_bundle(struct transport *transport)
 389 {
 390         struct bundle_transport_data *data = transport->data;
 391         if (data->fd > 0)
 392                 close(data->fd);
 393         free(data);
 394         return 0;
 395 }
 396
 397 struct git_transport_data {
 398         unsigned thin : 1;
 399         unsigned keep : 1;
 400         unsigned followtags : 1;
 401         int depth;
 402         struct child_process *conn;
 403         int fd[2];
 404         const char *uploadpack;
 405         const char *receivepack;
 406         struct extra_have_objects extra_have;
 407 };
 408
 409 static int set_git_option(struct transport *connection,
 410                           const char *name, const char *value)
 411 {
 412         struct git_transport_data *data = connection->data;
 413         if (!strcmp(name, TRANS_OPT_UPLOADPACK)) {
 414                 data->uploadpack = value;
 415                 return 0;
 416         } else if (!strcmp(name, TRANS_OPT_RECEIVEPACK)) {
 417                 data->receivepack = value;
 418                 return 0;
 419         } else if (!strcmp(name, TRANS_OPT_THIN)) {
 420                 data->thin = !!value;
 421                 return 0;
 422         } else if (!strcmp(name, TRANS_OPT_FOLLOWTAGS)) {
 423                 data->followtags = !!value;
 424                 return 0;
 425         } else if (!strcmp(name, TRANS_OPT_KEEP)) {
 426                 data->keep = !!value;
 427                 return 0;
 428         } else if (!strcmp(name, TRANS_OPT_DEPTH)) {
 429                 if (!value)
 430                         data->depth = 0;
 431                 else
 432                         data->depth = atoi(value);
 433                 return 0;
 434         }
 435         return 1;
 436 }
 437
 438 static int connect_setup(struct transport *transport, int for_push, int verbose)
 439 {
 440         struct git_transport_data *data = transport->data;
 441         data->conn = git_connect(data->fd, transport->url,
 442                                  for_push ? data->receivepack : data->uploadpack,
 443                                  verbose ? CONNECT_VERBOSE : 0);
 444         return 0;
 445 }
 446
 447 static struct ref *get_refs_via_connect(struct transport *transport, int for_push)
 448 {
 449         struct git_transport_data *data = transport->data;
 450         struct ref *refs;
 451
 452         connect_setup(transport, for_push, 0);
 453         get_remote_heads(data->fd[0], &refs, 0, NULL,
 454                          for_push ? REF_NORMAL : 0, &data->extra_have);
 455
 456         return refs;
 457 }
 458
 459 static int fetch_refs_via_pack(struct transport *transport,
 460                                int nr_heads, struct ref **to_fetch)
 461 {
 462         struct git_transport_data *data = transport->data;
 463         char **heads = xmalloc(nr_heads * sizeof(*heads));
 464         char **origh = xmalloc(nr_heads * sizeof(*origh));
 465         const struct ref *refs;
 466         char *dest = xstrdup(transport->url);
 467         struct fetch_pack_args args;
 468         int i;
 469         struct ref *refs_tmp = NULL;
 470
 471         memset(&args, 0, sizeof(args));
 472         args.uploadpack = data->uploadpack;
 473         args.keep_pack = data->keep;
 474         args.lock_pack = 1;
 475         args.use_thin_pack = data->thin;
 476         args.include_tag = data->followtags;
 477         args.verbose = (transport->verbose > 0);
 478         args.quiet = (transport->verbose < 0);
 479         args.no_progress = args.quiet || (!transport->progress && !isatty(1));
 480         args.depth = data->depth;
 481
 482         for (i = 0; i < nr_heads; i++)
 483                 origh[i] = heads[i] = xstrdup(to_fetch[i]->name);
 484
 485         if (!data->conn) {
 486                 connect_setup(transport, 0, 0);
 487                 get_remote_heads(data->fd[0], &refs_tmp, 0, NULL, 0, NULL);
 488         }
 489
 490         refs = fetch_pack(&args, data->fd, data->conn,
 491                           refs_tmp ? refs_tmp : transport->remote_refs,
 492                           dest, nr_heads, heads, &transport->pack_lockfile);
 493         close(data->fd[0]);
 494         close(data->fd[1]);
 495         if (finish_connect(data->conn))
 496                 refs = NULL;
 497         data->conn = NULL;
 498
 499         free_refs(refs_tmp);
 500
 501         for (i = 0; i < nr_heads; i++)
 502                 free(origh[i]);
 503         free(origh);
 504         free(heads);
 505         free(dest);
 506         return (refs ? 0 : -1);
 507 }
 508
 509 static int push_had_errors(struct ref *ref)
 510 {
 511         for (; ref; ref = ref->next) {
 512                 switch (ref->status) {
 513                 case REF_STATUS_NONE:
 514                 case REF_STATUS_UPTODATE:
 515                 case REF_STATUS_OK:
 516                         break;
 517                 default:
 518                         return 1;
 519                 }
 520         }
 521         return 0;
 522 }
 523
 524 static int refs_pushed(struct ref *ref)
 525 {
 526         for (; ref; ref = ref->next) {
 527                 switch(ref->status) {
 528                 case REF_STATUS_NONE:
 529                 case REF_STATUS_UPTODATE:
 530                         break;
 531                 default:
 532                         return 1;
 533                 }
 534         }
 535         return 0;
 536 }
 537
 538 static void update_tracking_ref(struct remote *remote, struct ref *ref, int verbose)
 539 {
 540         struct refspec rs;
 541
 542         if (ref->status != REF_STATUS_OK && ref->status != REF_STATUS_UPTODATE)
 543                 return;
 544
 545         rs.src = ref->name;
 546         rs.dst = NULL;
 547
 548         if (!remote_find_tracking(remote, &rs)) {
 549                 if (verbose)
 550                         fprintf(stderr, "updating local tracking ref '%s'\n", rs.dst);
 551                 if (ref->deletion) {
 552                         delete_ref(rs.dst, NULL, 0);
 553                 } else
 554                         update_ref("update by push", rs.dst,
 555                                         ref->new_sha1, NULL, 0, 0);
 556                 free(rs.dst);
 557         }
 558 }
 559
 560 #define SUMMARY_WIDTH (2 * DEFAULT_ABBREV + 3)
 561
 562 static void print_ref_status(char flag, const char *summary, struct ref *to, struct ref *from, const char *msg, int porcelain)
 563 {
 564         if (porcelain) {
 565                 if (from)
 566                         fprintf(stdout, "%c\t%s:%s\t", flag, from->name, to->name);
 567                 else
 568                         fprintf(stdout, "%c\t:%s\t", flag, to->name);
 569                 if (msg)
 570                         fprintf(stdout, "%s (%s)\n", summary, msg);
 571                 else
 572                         fprintf(stdout, "%s\n", summary);
 573         } else {
 574                 fprintf(stderr, " %c %-*s ", flag, SUMMARY_WIDTH, summary);
 575                 if (from)
 576                         fprintf(stderr, "%s -> %s", prettify_refname(from->name), prettify_refname(to->name));
 577                 else
 578                         fputs(prettify_refname(to->name), stderr);
 579                 if (msg) {
 580                         fputs(" (", stderr);
 581                         fputs(msg, stderr);
 582                         fputc(')', stderr);
 583                 }
 584                 fputc('\n', stderr);
 585         }
 586 }
 587
 588 static const char *status_abbrev(unsigned char sha1[20])
 589 {
 590         return find_unique_abbrev(sha1, DEFAULT_ABBREV);
 591 }
 592
 593 static void print_ok_ref_status(struct ref *ref, int porcelain)
 594 {
 595         if (ref->deletion)
 596                 print_ref_status('-', "[deleted]", ref, NULL, NULL, porcelain);
 597         else if (is_null_sha1(ref->old_sha1))
 598                 print_ref_status('*',
 599                         (!prefixcmp(ref->name, "refs/tags/") ? "[new tag]" :
 600                         "[new branch]"),
 601                         ref, ref->peer_ref, NULL, porcelain);
 602         else {
 603                 char quickref[84];
 604                 char type;
 605                 const char *msg;
 606
 607                 strcpy(quickref, status_abbrev(ref->old_sha1));
 608                 if (ref->nonfastforward) {
 609                         strcat(quickref, "...");
 610                         type = '+';
 611                         msg = "forced update";
 612                 } else {
 613                         strcat(quickref, "..");
 614                         type = ' ';
 615                         msg = NULL;
 616                 }
 617                 strcat(quickref, status_abbrev(ref->new_sha1));
 618
 619                 print_ref_status(type, quickref, ref, ref->peer_ref, msg, porcelain);
 620         }
 621 }
 622
 623 static int print_one_push_status(struct ref *ref, const char *dest, int count, int porcelain)
 624 {
 625         if (!count)
 626                 fprintf(stderr, "To %s\n", dest);
 627
 628         switch(ref->status) {
 629         case REF_STATUS_NONE:
 630                 print_ref_status('X', "[no match]", ref, NULL, NULL, porcelain);
 631                 break;
 632         case REF_STATUS_REJECT_NODELETE:
 633                 print_ref_status('!', "[rejected]", ref, NULL,
 634                                                  "remote does not support deleting refs", porcelain);
 635                 break;
 636         case REF_STATUS_UPTODATE:
 637                 print_ref_status('=', "[up to date]", ref,
 638                                                  ref->peer_ref, NULL, porcelain);
 639                 break;
 640         case REF_STATUS_REJECT_NONFASTFORWARD:
 641                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 642                                                  "non-fast-forward", porcelain);
 643                 break;
 644         case REF_STATUS_REMOTE_REJECT:
 645                 print_ref_status('!', "[remote rejected]", ref,
 646                                                  ref->deletion ? NULL : ref->peer_ref,
 647                                                  ref->remote_status, porcelain);
 648                 break;
 649         case REF_STATUS_EXPECTING_REPORT:
 650                 print_ref_status('!', "[remote failure]", ref,
 651                                                  ref->deletion ? NULL : ref->peer_ref,
 652                                                  "remote failed to report status", porcelain);
 653                 break;
 654         case REF_STATUS_OK:
 655                 print_ok_ref_status(ref, porcelain);
 656                 break;
 657         }
 658
 659         return 1;
 660 }
 661
 662 static void print_push_status(const char *dest, struct ref *refs,
 663                               int verbose, int porcelain, int * nonfastforward)
 664 {
 665         struct ref *ref;
 666         int n = 0;
 667
 668         if (verbose) {
 669                 for (ref = refs; ref; ref = ref->next)
 670                         if (ref->status == REF_STATUS_UPTODATE)
 671                                 n += print_one_push_status(ref, dest, n, porcelain);
 672         }
 673
 674         for (ref = refs; ref; ref = ref->next)
 675                 if (ref->status == REF_STATUS_OK)
 676                         n += print_one_push_status(ref, dest, n, porcelain);
 677
 678         *nonfastforward = 0;
 679         for (ref = refs; ref; ref = ref->next) {
 680                 if (ref->status != REF_STATUS_NONE &&
 681                     ref->status != REF_STATUS_UPTODATE &&
 682                     ref->status != REF_STATUS_OK)
 683                         n += print_one_push_status(ref, dest, n, porcelain);
 684                 if (ref->status == REF_STATUS_REJECT_NONFASTFORWARD)
 685                         *nonfastforward = 1;
 686         }
 687 }
 688
 689 static void verify_remote_names(int nr_heads, const char **heads)
 690 {
 691         int i;
 692
 693         for (i = 0; i < nr_heads; i++) {
 694                 const char *local = heads[i];
 695                 const char *remote = strrchr(heads[i], ':');
 696
 697                 if (*local == '+')
 698                         local++;
 699
 700                 /* A matching refspec is okay.  */
 701                 if (remote == local && remote[1] == '\0')
 702                         continue;
 703
 704                 remote = remote ? (remote + 1) : local;
 705                 switch (check_ref_format(remote)) {
 706                 case 0: /* ok */
 707                 case CHECK_REF_FORMAT_ONELEVEL:
 708                         /* ok but a single level -- that is fine for
 709                          * a match pattern.
 710                          */
 711                 case CHECK_REF_FORMAT_WILDCARD:
 712                         /* ok but ends with a pattern-match character */
 713                         continue;
 714                 }
 715                 die("remote part of refspec is not a valid name in %s",
 716                     heads[i]);
 717         }
 718 }
 719
 720 static int git_transport_push(struct transport *transport, struct ref *remote_refs, int flags)
 721 {
 722         struct git_transport_data *data = transport->data;
 723         struct send_pack_args args;
 724         int ret;
 725
 726         if (!data->conn) {
 727                 struct ref *tmp_refs;
 728                 connect_setup(transport, 1, 0);
 729
 730                 get_remote_heads(data->fd[0], &tmp_refs, 0, NULL, REF_NORMAL,
 731                                  NULL);
 732         }
 733
 734         memset(&args, 0, sizeof(args));
 735         args.send_mirror = !!(flags & TRANSPORT_PUSH_MIRROR);
 736         args.force_update = !!(flags & TRANSPORT_PUSH_FORCE);
 737         args.use_thin_pack = data->thin;
 738         args.verbose = !!(flags & TRANSPORT_PUSH_VERBOSE);
 739         args.quiet = !!(flags & TRANSPORT_PUSH_QUIET);
 740         args.dry_run = !!(flags & TRANSPORT_PUSH_DRY_RUN);
 741
 742         ret = send_pack(&args, data->fd, data->conn, remote_refs,
 743                         &data->extra_have);
 744
 745         close(data->fd[1]);
 746         close(data->fd[0]);
 747         ret |= finish_connect(data->conn);
 748         data->conn = NULL;
 749
 750         return ret;
 751 }
 752
 753 static int disconnect_git(struct transport *transport)
 754 {
 755         struct git_transport_data *data = transport->data;
 756         if (data->conn) {
 757                 packet_flush(data->fd[1]);
 758                 close(data->fd[0]);
 759                 close(data->fd[1]);
 760                 finish_connect(data->conn);
 761         }
 762
 763         free(data);
 764         return 0;
 765 }
 766
 767 static int is_local(const char *url)
 768 {
 769         const char *colon = strchr(url, ':');
 770         const char *slash = strchr(url, '/');
 771         return !colon || (slash && slash < colon) ||
 772                 has_dos_drive_prefix(url);
 773 }
 774
 775 static int is_file(const char *url)
 776 {
 777         struct stat buf;
 778         if (stat(url, &buf))
 779                 return 0;
 780         return S_ISREG(buf.st_mode);
 781 }
 782
 783 struct transport *transport_get(struct remote *remote, const char *url)
 784 {
 785         struct transport *ret = xcalloc(1, sizeof(*ret));
 786
 787         if (!remote)
 788                 die("No remote provided to transport_get()");
 789
 790         ret->remote = remote;
 791
 792         if (!url && remote && remote->url)
 793                 url = remote->url[0];
 794         ret->url = url;
 795
 796         /* maybe it is a foreign URL? */
 797         if (url) {
 798                 const char *p = url;
 799
 800                 while (isalnum(*p))
 801                         p++;
 802                 if (!prefixcmp(p, "::"))
 803                         remote->foreign_vcs = xstrndup(url, p - url);
 804         }
 805
 806         if (remote && remote->foreign_vcs) {
 807                 transport_helper_init(ret, remote->foreign_vcs);
 808                 return ret;
 809         }
 810
 811         if (!prefixcmp(url, "rsync:")) {
 812                 ret->get_refs_list = get_refs_via_rsync;
 813                 ret->fetch = fetch_objs_via_rsync;
 814                 ret->push = rsync_transport_push;
 815
 816         } else if (!prefixcmp(url, "http://")
 817                 || !prefixcmp(url, "https://")
 818                 || !prefixcmp(url, "ftp://")) {
 819                 transport_helper_init(ret, "curl");
 820 #ifdef NO_CURL
 821                 error("git was compiled without libcurl support.");
 822 #endif
 823
 824         } else if (is_local(url) && is_file(url)) {
 825                 struct bundle_transport_data *data = xcalloc(1, sizeof(*data));
 826                 ret->data = data;
 827                 ret->get_refs_list = get_refs_from_bundle;
 828                 ret->fetch = fetch_refs_from_bundle;
 829                 ret->disconnect = close_bundle;
 830
 831         } else {
 832                 struct git_transport_data *data = xcalloc(1, sizeof(*data));
 833                 ret->data = data;
 834                 ret->set_option = set_git_option;
 835                 ret->get_refs_list = get_refs_via_connect;
 836                 ret->fetch = fetch_refs_via_pack;
 837                 ret->push_refs = git_transport_push;
 838                 ret->disconnect = disconnect_git;
 839
 840                 data->thin = 1;
 841                 data->conn = NULL;
 842                 data->uploadpack = "git-upload-pack";
 843                 if (remote->uploadpack)
 844                         data->uploadpack = remote->uploadpack;
 845                 data->receivepack = "git-receive-pack";
 846                 if (remote->receivepack)
 847                         data->receivepack = remote->receivepack;
 848         }
 849
 850         return ret;
 851 }
 852
 853 int transport_set_option(struct transport *transport,
 854                          const char *name, const char *value)
 855 {
 856         if (transport->set_option)
 857                 return transport->set_option(transport, name, value);
 858         return 1;
 859 }
 860
 861 int transport_push(struct transport *transport,
 862                    int refspec_nr, const char **refspec, int flags,
 863                    int *nonfastforward)
 864 {
 865         *nonfastforward = 0;
 866         verify_remote_names(refspec_nr, refspec);
 867
 868         if (transport->push)
 869                 return transport->push(transport, refspec_nr, refspec, flags);
 870         if (transport->push_refs) {
 871                 struct ref *remote_refs =
 872                         transport->get_refs_list(transport, 1);
 873                 struct ref *local_refs = get_local_heads();
 874                 int match_flags = MATCH_REFS_NONE;
 875                 int verbose = flags & TRANSPORT_PUSH_VERBOSE;
 876                 int quiet = flags & TRANSPORT_PUSH_QUIET;
 877                 int porcelain = flags & TRANSPORT_PUSH_PORCELAIN;
 878                 int ret;
 879
 880                 if (flags & TRANSPORT_PUSH_ALL)
 881                         match_flags |= MATCH_REFS_ALL;
 882                 if (flags & TRANSPORT_PUSH_MIRROR)
 883                         match_flags |= MATCH_REFS_MIRROR;
 884
 885                 if (match_refs(local_refs, &remote_refs,
 886                                refspec_nr, refspec, match_flags)) {
 887                         return -1;
 888                 }
 889
 890                 ret = transport->push_refs(transport, remote_refs, flags);
 891
 892                 if (!quiet || push_had_errors(remote_refs))
 893                         print_push_status(transport->url, remote_refs,
 894                                         verbose | porcelain, porcelain,
 895                                         nonfastforward);
 896
 897                 if (!(flags & TRANSPORT_PUSH_DRY_RUN)) {
 898                         struct ref *ref;
 899                         for (ref = remote_refs; ref; ref = ref->next)
 900                                 update_tracking_ref(transport->remote, ref, verbose);
 901                 }
 902
 903                 if (!quiet && !ret && !refs_pushed(remote_refs))
 904                         fprintf(stderr, "Everything up-to-date\n");
 905                 return ret;
 906         }
 907         return 1;
 908 }
 909
 910 const struct ref *transport_get_remote_refs(struct transport *transport)
 911 {
 912         if (!transport->remote_refs)
 913                 transport->remote_refs = transport->get_refs_list(transport, 0);
 914         return transport->remote_refs;
 915 }
 916
 917 int transport_fetch_refs(struct transport *transport, struct ref *refs)
 918 {
 919         int rc;
 920         int nr_heads = 0, nr_alloc = 0, nr_refs = 0;
 921         struct ref **heads = NULL;
 922         struct ref *rm;
 923
 924         for (rm = refs; rm; rm = rm->next) {
 925                 nr_refs++;
 926                 if (rm->peer_ref &&
 927                     !is_null_sha1(rm->old_sha1) &&
 928                     !hashcmp(rm->peer_ref->old_sha1, rm->old_sha1))
 929                         continue;
 930                 ALLOC_GROW(heads, nr_heads + 1, nr_alloc);
 931                 heads[nr_heads++] = rm;
 932         }
 933
 934         if (!nr_heads) {
 935                 /*
 936                  * When deepening of a shallow repository is requested,
 937                  * then local and remote refs are likely to still be equal.
 938                  * Just feed them all to the fetch method in that case.
 939                  * This condition shouldn't be met in a non-deepening fetch
 940                  * (see builtin-fetch.c:quickfetch()).
 941                  */
 942                 heads = xmalloc(nr_refs * sizeof(*heads));
 943                 for (rm = refs; rm; rm = rm->next)
 944                         heads[nr_heads++] = rm;
 945         }
 946
 947         rc = transport->fetch(transport, nr_heads, heads);
 948         free(heads);
 949         return rc;
 950 }
 951
 952 void transport_unlock_pack(struct transport *transport)
 953 {
 954         if (transport->pack_lockfile) {
 955                 unlink_or_warn(transport->pack_lockfile);
 956                 free(transport->pack_lockfile);
 957                 transport->pack_lockfile = NULL;
 958         }
 959 }
 960
 961 int transport_disconnect(struct transport *transport)
 962 {
 963         int ret = 0;
 964         if (transport->disconnect)
 965                 ret = transport->disconnect(transport);
 966         free(transport);
 967         return ret;
 968 }
 969
 970 /*
 971  * Strip username (and password) from an url and return
 972  * it in a newly allocated string.
 973  */
 974 char *transport_anonymize_url(const char *url)
 975 {
 976         char *anon_url, *scheme_prefix, *anon_part;
 977         size_t anon_len, prefix_len = 0;
 978
 979         anon_part = strchr(url, '@');
 980         if (is_local(url) || !anon_part)
 981                 goto literal_copy;
 982
 983         anon_len = strlen(++anon_part);
 984         scheme_prefix = strstr(url, "://");
 985         if (!scheme_prefix) {
 986                 if (!strchr(anon_part, ':'))
 987                         /* cannot be "me@there:/path/name" */
 988                         goto literal_copy;
 989         } else {
 990                 const char *cp;
 991                 /* make sure scheme is reasonable */
 992                 for (cp = url; cp < scheme_prefix; cp++) {
 993                         switch (*cp) {
 994                                 /* RFC 1738 2.1 */
 995                         case '+': case '.': case '-':
 996                                 break; /* ok */
 997                         default:
 998                                 if (isalnum(*cp))
 999                                         break;
1000                                 /* it isn't */
1001                                 goto literal_copy;
1002                         }
1003                 }
1004                 /* @ past the first slash does not count */
1005                 cp = strchr(scheme_prefix + 3, '/');
1006                 if (cp && cp < anon_part)
1007                         goto literal_copy;
1008                 prefix_len = scheme_prefix - url + 3;
1009         }
1010         anon_url = xcalloc(1, 1 + prefix_len + anon_len);
1011         memcpy(anon_url, url, prefix_len);
1012         memcpy(anon_url + prefix_len, anon_part, anon_len);
1013         return anon_url;
1014 literal_copy:
1015         return xstrdup(url);
1016 }