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 = {0}, *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         struct git_transport_options options;
 399         struct child_process *conn;
 400         int fd[2];
 401         unsigned got_remote_heads : 1;
 402         struct extra_have_objects extra_have;
 403 };
 404
 405 static int set_git_option(struct git_transport_options *opts,
 406                           const char *name, const char *value)
 407 {
 408         if (!strcmp(name, TRANS_OPT_UPLOADPACK)) {
 409                 opts->uploadpack = value;
 410                 return 0;
 411         } else if (!strcmp(name, TRANS_OPT_RECEIVEPACK)) {
 412                 opts->receivepack = value;
 413                 return 0;
 414         } else if (!strcmp(name, TRANS_OPT_THIN)) {
 415                 opts->thin = !!value;
 416                 return 0;
 417         } else if (!strcmp(name, TRANS_OPT_FOLLOWTAGS)) {
 418                 opts->followtags = !!value;
 419                 return 0;
 420         } else if (!strcmp(name, TRANS_OPT_KEEP)) {
 421                 opts->keep = !!value;
 422                 return 0;
 423         } else if (!strcmp(name, TRANS_OPT_DEPTH)) {
 424                 if (!value)
 425                         opts->depth = 0;
 426                 else
 427                         opts->depth = atoi(value);
 428                 return 0;
 429         }
 430         return 1;
 431 }
 432
 433 static int connect_setup(struct transport *transport, int for_push, int verbose)
 434 {
 435         struct git_transport_data *data = transport->data;
 436
 437         if (data->conn)
 438                 return 0;
 439
 440         data->conn = git_connect(data->fd, transport->url,
 441                                  for_push ? data->options.receivepack :
 442                                  data->options.uploadpack,
 443                                  verbose ? CONNECT_VERBOSE : 0);
 444
 445         return 0;
 446 }
 447
 448 static struct ref *get_refs_via_connect(struct transport *transport, int for_push)
 449 {
 450         struct git_transport_data *data = transport->data;
 451         struct ref *refs;
 452
 453         connect_setup(transport, for_push, 0);
 454         get_remote_heads(data->fd[0], &refs, 0, NULL,
 455                          for_push ? REF_NORMAL : 0, &data->extra_have);
 456         data->got_remote_heads = 1;
 457
 458         return refs;
 459 }
 460
 461 static int fetch_refs_via_pack(struct transport *transport,
 462                                int nr_heads, struct ref **to_fetch)
 463 {
 464         struct git_transport_data *data = transport->data;
 465         char **heads = xmalloc(nr_heads * sizeof(*heads));
 466         char **origh = xmalloc(nr_heads * sizeof(*origh));
 467         const struct ref *refs;
 468         char *dest = xstrdup(transport->url);
 469         struct fetch_pack_args args;
 470         int i;
 471         struct ref *refs_tmp = NULL;
 472
 473         memset(&args, 0, sizeof(args));
 474         args.uploadpack = data->options.uploadpack;
 475         args.keep_pack = data->options.keep;
 476         args.lock_pack = 1;
 477         args.use_thin_pack = data->options.thin;
 478         args.include_tag = data->options.followtags;
 479         args.verbose = (transport->verbose > 0);
 480         args.quiet = (transport->verbose < 0);
 481         args.no_progress = args.quiet || (!transport->progress && !isatty(1));
 482         args.depth = data->options.depth;
 483
 484         for (i = 0; i < nr_heads; i++)
 485                 origh[i] = heads[i] = xstrdup(to_fetch[i]->name);
 486
 487         if (!data->got_remote_heads) {
 488                 connect_setup(transport, 0, 0);
 489                 get_remote_heads(data->fd[0], &refs_tmp, 0, NULL, 0, NULL);
 490                 data->got_remote_heads = 1;
 491         }
 492
 493         refs = fetch_pack(&args, data->fd, data->conn,
 494                           refs_tmp ? refs_tmp : transport->remote_refs,
 495                           dest, nr_heads, heads, &transport->pack_lockfile);
 496         close(data->fd[0]);
 497         close(data->fd[1]);
 498         if (finish_connect(data->conn))
 499                 refs = NULL;
 500         data->conn = NULL;
 501         data->got_remote_heads = 0;
 502
 503         free_refs(refs_tmp);
 504
 505         for (i = 0; i < nr_heads; i++)
 506                 free(origh[i]);
 507         free(origh);
 508         free(heads);
 509         free(dest);
 510         return (refs ? 0 : -1);
 511 }
 512
 513 static int push_had_errors(struct ref *ref)
 514 {
 515         for (; ref; ref = ref->next) {
 516                 switch (ref->status) {
 517                 case REF_STATUS_NONE:
 518                 case REF_STATUS_UPTODATE:
 519                 case REF_STATUS_OK:
 520                         break;
 521                 default:
 522                         return 1;
 523                 }
 524         }
 525         return 0;
 526 }
 527
 528 static int refs_pushed(struct ref *ref)
 529 {
 530         for (; ref; ref = ref->next) {
 531                 switch(ref->status) {
 532                 case REF_STATUS_NONE:
 533                 case REF_STATUS_UPTODATE:
 534                         break;
 535                 default:
 536                         return 1;
 537                 }
 538         }
 539         return 0;
 540 }
 541
 542 static void update_tracking_ref(struct remote *remote, struct ref *ref, int verbose)
 543 {
 544         struct refspec rs;
 545
 546         if (ref->status != REF_STATUS_OK && ref->status != REF_STATUS_UPTODATE)
 547                 return;
 548
 549         rs.src = ref->name;
 550         rs.dst = NULL;
 551
 552         if (!remote_find_tracking(remote, &rs)) {
 553                 if (verbose)
 554                         fprintf(stderr, "updating local tracking ref '%s'\n", rs.dst);
 555                 if (ref->deletion) {
 556                         delete_ref(rs.dst, NULL, 0);
 557                 } else
 558                         update_ref("update by push", rs.dst,
 559                                         ref->new_sha1, NULL, 0, 0);
 560                 free(rs.dst);
 561         }
 562 }
 563
 564 #define SUMMARY_WIDTH (2 * DEFAULT_ABBREV + 3)
 565
 566 static void print_ref_status(char flag, const char *summary, struct ref *to, struct ref *from, const char *msg, int porcelain)
 567 {
 568         if (porcelain) {
 569                 if (from)
 570                         fprintf(stdout, "%c\t%s:%s\t", flag, from->name, to->name);
 571                 else
 572                         fprintf(stdout, "%c\t:%s\t", flag, to->name);
 573                 if (msg)
 574                         fprintf(stdout, "%s (%s)\n", summary, msg);
 575                 else
 576                         fprintf(stdout, "%s\n", summary);
 577         } else {
 578                 fprintf(stderr, " %c %-*s ", flag, SUMMARY_WIDTH, summary);
 579                 if (from)
 580                         fprintf(stderr, "%s -> %s", prettify_refname(from->name), prettify_refname(to->name));
 581                 else
 582                         fputs(prettify_refname(to->name), stderr);
 583                 if (msg) {
 584                         fputs(" (", stderr);
 585                         fputs(msg, stderr);
 586                         fputc(')', stderr);
 587                 }
 588                 fputc('\n', stderr);
 589         }
 590 }
 591
 592 static const char *status_abbrev(unsigned char sha1[20])
 593 {
 594         return find_unique_abbrev(sha1, DEFAULT_ABBREV);
 595 }
 596
 597 static void print_ok_ref_status(struct ref *ref, int porcelain)
 598 {
 599         if (ref->deletion)
 600                 print_ref_status('-', "[deleted]", ref, NULL, NULL, porcelain);
 601         else if (is_null_sha1(ref->old_sha1))
 602                 print_ref_status('*',
 603                         (!prefixcmp(ref->name, "refs/tags/") ? "[new tag]" :
 604                         "[new branch]"),
 605                         ref, ref->peer_ref, NULL, porcelain);
 606         else {
 607                 char quickref[84];
 608                 char type;
 609                 const char *msg;
 610
 611                 strcpy(quickref, status_abbrev(ref->old_sha1));
 612                 if (ref->nonfastforward) {
 613                         strcat(quickref, "...");
 614                         type = '+';
 615                         msg = "forced update";
 616                 } else {
 617                         strcat(quickref, "..");
 618                         type = ' ';
 619                         msg = NULL;
 620                 }
 621                 strcat(quickref, status_abbrev(ref->new_sha1));
 622
 623                 print_ref_status(type, quickref, ref, ref->peer_ref, msg, porcelain);
 624         }
 625 }
 626
 627 static int print_one_push_status(struct ref *ref, const char *dest, int count, int porcelain)
 628 {
 629         if (!count)
 630                 fprintf(stderr, "To %s\n", dest);
 631
 632         switch(ref->status) {
 633         case REF_STATUS_NONE:
 634                 print_ref_status('X', "[no match]", ref, NULL, NULL, porcelain);
 635                 break;
 636         case REF_STATUS_REJECT_NODELETE:
 637                 print_ref_status('!', "[rejected]", ref, NULL,
 638                                                  "remote does not support deleting refs", porcelain);
 639                 break;
 640         case REF_STATUS_UPTODATE:
 641                 print_ref_status('=', "[up to date]", ref,
 642                                                  ref->peer_ref, NULL, porcelain);
 643                 break;
 644         case REF_STATUS_REJECT_NONFASTFORWARD:
 645                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 646                                                  "non-fast-forward", porcelain);
 647                 break;
 648         case REF_STATUS_REMOTE_REJECT:
 649                 print_ref_status('!', "[remote rejected]", ref,
 650                                                  ref->deletion ? NULL : ref->peer_ref,
 651                                                  ref->remote_status, porcelain);
 652                 break;
 653         case REF_STATUS_EXPECTING_REPORT:
 654                 print_ref_status('!', "[remote failure]", ref,
 655                                                  ref->deletion ? NULL : ref->peer_ref,
 656                                                  "remote failed to report status", porcelain);
 657                 break;
 658         case REF_STATUS_OK:
 659                 print_ok_ref_status(ref, porcelain);
 660                 break;
 661         }
 662
 663         return 1;
 664 }
 665
 666 static void print_push_status(const char *dest, struct ref *refs,
 667                               int verbose, int porcelain, int * nonfastforward)
 668 {
 669         struct ref *ref;
 670         int n = 0;
 671
 672         if (verbose) {
 673                 for (ref = refs; ref; ref = ref->next)
 674                         if (ref->status == REF_STATUS_UPTODATE)
 675                                 n += print_one_push_status(ref, dest, n, porcelain);
 676         }
 677
 678         for (ref = refs; ref; ref = ref->next)
 679                 if (ref->status == REF_STATUS_OK)
 680                         n += print_one_push_status(ref, dest, n, porcelain);
 681
 682         *nonfastforward = 0;
 683         for (ref = refs; ref; ref = ref->next) {
 684                 if (ref->status != REF_STATUS_NONE &&
 685                     ref->status != REF_STATUS_UPTODATE &&
 686                     ref->status != REF_STATUS_OK)
 687                         n += print_one_push_status(ref, dest, n, porcelain);
 688                 if (ref->status == REF_STATUS_REJECT_NONFASTFORWARD)
 689                         *nonfastforward = 1;
 690         }
 691 }
 692
 693 static void verify_remote_names(int nr_heads, const char **heads)
 694 {
 695         int i;
 696
 697         for (i = 0; i < nr_heads; i++) {
 698                 const char *local = heads[i];
 699                 const char *remote = strrchr(heads[i], ':');
 700
 701                 if (*local == '+')
 702                         local++;
 703
 704                 /* A matching refspec is okay.  */
 705                 if (remote == local && remote[1] == '\0')
 706                         continue;
 707
 708                 remote = remote ? (remote + 1) : local;
 709                 switch (check_ref_format(remote)) {
 710                 case 0: /* ok */
 711                 case CHECK_REF_FORMAT_ONELEVEL:
 712                         /* ok but a single level -- that is fine for
 713                          * a match pattern.
 714                          */
 715                 case CHECK_REF_FORMAT_WILDCARD:
 716                         /* ok but ends with a pattern-match character */
 717                         continue;
 718                 }
 719                 die("remote part of refspec is not a valid name in %s",
 720                     heads[i]);
 721         }
 722 }
 723
 724 static int git_transport_push(struct transport *transport, struct ref *remote_refs, int flags)
 725 {
 726         struct git_transport_data *data = transport->data;
 727         struct send_pack_args args;
 728         int ret;
 729
 730         if (!data->got_remote_heads) {
 731                 struct ref *tmp_refs;
 732                 connect_setup(transport, 1, 0);
 733
 734                 get_remote_heads(data->fd[0], &tmp_refs, 0, NULL, REF_NORMAL,
 735                                  NULL);
 736                 data->got_remote_heads = 1;
 737         }
 738
 739         memset(&args, 0, sizeof(args));
 740         args.send_mirror = !!(flags & TRANSPORT_PUSH_MIRROR);
 741         args.force_update = !!(flags & TRANSPORT_PUSH_FORCE);
 742         args.use_thin_pack = data->options.thin;
 743         args.verbose = !!(flags & TRANSPORT_PUSH_VERBOSE);
 744         args.quiet = !!(flags & TRANSPORT_PUSH_QUIET);
 745         args.dry_run = !!(flags & TRANSPORT_PUSH_DRY_RUN);
 746
 747         ret = send_pack(&args, data->fd, data->conn, remote_refs,
 748                         &data->extra_have);
 749
 750         close(data->fd[1]);
 751         close(data->fd[0]);
 752         ret |= finish_connect(data->conn);
 753         data->conn = NULL;
 754         data->got_remote_heads = 0;
 755
 756         return ret;
 757 }
 758
 759 static int connect_git(struct transport *transport, const char *name,
 760                        const char *executable, int fd[2])
 761 {
 762         struct git_transport_data *data = transport->data;
 763         data->conn = git_connect(data->fd, transport->url,
 764                                  executable, 0);
 765         fd[0] = data->fd[0];
 766         fd[1] = data->fd[1];
 767         return 0;
 768 }
 769
 770 static int disconnect_git(struct transport *transport)
 771 {
 772         struct git_transport_data *data = transport->data;
 773         if (data->conn) {
 774                 if (data->got_remote_heads)
 775                         packet_flush(data->fd[1]);
 776                 close(data->fd[0]);
 777                 close(data->fd[1]);
 778                 finish_connect(data->conn);
 779         }
 780
 781         free(data);
 782         return 0;
 783 }
 784
 785 void transport_take_over(struct transport *transport,
 786                          struct child_process *child)
 787 {
 788         struct git_transport_data *data;
 789
 790         if (!transport->smart_options)
 791                 die("Bug detected: Taking over transport requires non-NULL "
 792                     "smart_options field.");
 793
 794         data = xcalloc(1, sizeof(*data));
 795         data->options = *transport->smart_options;
 796         data->conn = child;
 797         data->fd[0] = data->conn->out;
 798         data->fd[1] = data->conn->in;
 799         data->got_remote_heads = 0;
 800         transport->data = data;
 801
 802         transport->set_option = NULL;
 803         transport->get_refs_list = get_refs_via_connect;
 804         transport->fetch = fetch_refs_via_pack;
 805         transport->push = NULL;
 806         transport->push_refs = git_transport_push;
 807         transport->disconnect = disconnect_git;
 808         transport->smart_options = &(data->options);
 809 }
 810
 811 static int is_local(const char *url)
 812 {
 813         const char *colon = strchr(url, ':');
 814         const char *slash = strchr(url, '/');
 815         return !colon || (slash && slash < colon) ||
 816                 has_dos_drive_prefix(url);
 817 }
 818
 819 static int is_file(const char *url)
 820 {
 821         struct stat buf;
 822         if (stat(url, &buf))
 823                 return 0;
 824         return S_ISREG(buf.st_mode);
 825 }
 826
 827 static int is_url(const char *url)
 828 {
 829         const char *url2, *first_slash;
 830
 831         if (!url)
 832                 return 0;
 833         url2 = url;
 834         first_slash = strchr(url, '/');
 835
 836         /* Input with no slash at all or slash first can't be URL. */
 837         if (!first_slash || first_slash == url)
 838                 return 0;
 839         /* Character before must be : and next must be /. */
 840         if (first_slash[-1] != ':' || first_slash[1] != '/')
 841                 return 0;
 842         /* There must be something before the :// */
 843         if (first_slash == url + 1)
 844                 return 0;
 845         /*
 846          * Check all characters up to first slash - 1. Only alphanum
 847          * is allowed.
 848          */
 849         url2 = url;
 850         while (url2 < first_slash - 1) {
 851                 if (!isalnum((unsigned char)*url2))
 852                         return 0;
 853                 url2++;
 854         }
 855
 856         /* Valid enough. */
 857         return 1;
 858 }
 859
 860 static int external_specification_len(const char *url)
 861 {
 862         return strchr(url, ':') - url;
 863 }
 864
 865 struct transport *transport_get(struct remote *remote, const char *url)
 866 {
 867         struct transport *ret = xcalloc(1, sizeof(*ret));
 868
 869         if (!remote)
 870                 die("No remote provided to transport_get()");
 871
 872         ret->remote = remote;
 873
 874         if (!url && remote && remote->url)
 875                 url = remote->url[0];
 876         ret->url = url;
 877
 878         /* In case previous URL had helper forced, reset it. */
 879         remote->foreign_vcs = NULL;
 880
 881         /* maybe it is a foreign URL? */
 882         if (url) {
 883                 const char *p = url;
 884
 885                 while (isalnum(*p))
 886                         p++;
 887                 if (!prefixcmp(p, "::"))
 888                         remote->foreign_vcs = xstrndup(url, p - url);
 889         }
 890
 891         if (remote && remote->foreign_vcs) {
 892                 transport_helper_init(ret, remote->foreign_vcs);
 893         } else if (!prefixcmp(url, "rsync:")) {
 894                 ret->get_refs_list = get_refs_via_rsync;
 895                 ret->fetch = fetch_objs_via_rsync;
 896                 ret->push = rsync_transport_push;
 897                 ret->smart_options = NULL;
 898         } else if (is_local(url) && is_file(url)) {
 899                 struct bundle_transport_data *data = xcalloc(1, sizeof(*data));
 900                 ret->data = data;
 901                 ret->get_refs_list = get_refs_from_bundle;
 902                 ret->fetch = fetch_refs_from_bundle;
 903                 ret->disconnect = close_bundle;
 904                 ret->smart_options = NULL;
 905         } else if (!is_url(url)
 906                 || !prefixcmp(url, "file://")
 907                 || !prefixcmp(url, "git://")
 908                 || !prefixcmp(url, "ssh://")
 909                 || !prefixcmp(url, "git+ssh://")
 910                 || !prefixcmp(url, "ssh+git://")) {
 911                 /* These are builtin smart transports. */
 912                 struct git_transport_data *data = xcalloc(1, sizeof(*data));
 913                 ret->data = data;
 914                 ret->set_option = NULL;
 915                 ret->get_refs_list = get_refs_via_connect;
 916                 ret->fetch = fetch_refs_via_pack;
 917                 ret->push_refs = git_transport_push;
 918                 ret->connect = connect_git;
 919                 ret->disconnect = disconnect_git;
 920                 ret->smart_options = &(data->options);
 921
 922                 data->conn = NULL;
 923                 data->got_remote_heads = 0;
 924         } else {
 925                 /* Unknown protocol in URL. Pass to external handler. */
 926                 int len = external_specification_len(url);
 927                 char *handler = xmalloc(len + 1);
 928                 handler[len] = 0;
 929                 strncpy(handler, url, len);
 930                 transport_helper_init(ret, handler);
 931         }
 932
 933         if (ret->smart_options) {
 934                 ret->smart_options->thin = 1;
 935                 ret->smart_options->uploadpack = "git-upload-pack";
 936                 if (remote->uploadpack)
 937                         ret->smart_options->uploadpack = remote->uploadpack;
 938                 ret->smart_options->receivepack = "git-receive-pack";
 939                 if (remote->receivepack)
 940                         ret->smart_options->receivepack = remote->receivepack;
 941         }
 942
 943         return ret;
 944 }
 945
 946 int transport_set_option(struct transport *transport,
 947                          const char *name, const char *value)
 948 {
 949         int git_reports = 1, protocol_reports = 1;
 950
 951         if (transport->smart_options)
 952                 git_reports = set_git_option(transport->smart_options,
 953                                              name, value);
 954
 955         if (transport->set_option)
 956                 protocol_reports = transport->set_option(transport, name,
 957                                                         value);
 958
 959         /* If either report is 0, report 0 (success). */
 960         if (!git_reports || !protocol_reports)
 961                 return 0;
 962         /* If either reports -1 (invalid value), report -1. */
 963         if ((git_reports == -1) || (protocol_reports == -1))
 964                 return -1;
 965         /* Otherwise if both report unknown, report unknown. */
 966         return 1;
 967 }
 968
 969 int transport_push(struct transport *transport,
 970                    int refspec_nr, const char **refspec, int flags,
 971                    int *nonfastforward)
 972 {
 973         *nonfastforward = 0;
 974         verify_remote_names(refspec_nr, refspec);
 975
 976         if (transport->push) {
 977                 return transport->push(transport, refspec_nr, refspec, flags);
 978         } else if (transport->push_refs) {
 979                 struct ref *remote_refs =
 980                         transport->get_refs_list(transport, 1);
 981                 struct ref *local_refs = get_local_heads();
 982                 int match_flags = MATCH_REFS_NONE;
 983                 int verbose = flags & TRANSPORT_PUSH_VERBOSE;
 984                 int quiet = flags & TRANSPORT_PUSH_QUIET;
 985                 int porcelain = flags & TRANSPORT_PUSH_PORCELAIN;
 986                 int ret;
 987
 988                 if (flags & TRANSPORT_PUSH_ALL)
 989                         match_flags |= MATCH_REFS_ALL;
 990                 if (flags & TRANSPORT_PUSH_MIRROR)
 991                         match_flags |= MATCH_REFS_MIRROR;
 992
 993                 if (match_refs(local_refs, &remote_refs,
 994                                refspec_nr, refspec, match_flags)) {
 995                         return -1;
 996                 }
 997
 998                 ret = transport->push_refs(transport, remote_refs, flags);
 999
1000                 if (!quiet || push_had_errors(remote_refs))
1001                         print_push_status(transport->url, remote_refs,
1002                                         verbose | porcelain, porcelain,
1003                                         nonfastforward);
1004
1005                 if (!(flags & TRANSPORT_PUSH_DRY_RUN)) {
1006                         struct ref *ref;
1007                         for (ref = remote_refs; ref; ref = ref->next)
1008                                 update_tracking_ref(transport->remote, ref, verbose);
1009                 }
1010
1011                 if (!quiet && !ret && !refs_pushed(remote_refs))
1012                         fprintf(stderr, "Everything up-to-date\n");
1013                 return ret;
1014         }
1015         return 1;
1016 }
1017
1018 const struct ref *transport_get_remote_refs(struct transport *transport)
1019 {
1020         if (!transport->remote_refs)
1021                 transport->remote_refs = transport->get_refs_list(transport, 0);
1022
1023         return transport->remote_refs;
1024 }
1025
1026 int transport_fetch_refs(struct transport *transport, struct ref *refs)
1027 {
1028         int rc;
1029         int nr_heads = 0, nr_alloc = 0, nr_refs = 0;
1030         struct ref **heads = NULL;
1031         struct ref *rm;
1032
1033         for (rm = refs; rm; rm = rm->next) {
1034                 nr_refs++;
1035                 if (rm->peer_ref &&
1036                     !is_null_sha1(rm->old_sha1) &&
1037                     !hashcmp(rm->peer_ref->old_sha1, rm->old_sha1))
1038                         continue;
1039                 ALLOC_GROW(heads, nr_heads + 1, nr_alloc);
1040                 heads[nr_heads++] = rm;
1041         }
1042
1043         if (!nr_heads) {
1044                 /*
1045                  * When deepening of a shallow repository is requested,
1046                  * then local and remote refs are likely to still be equal.
1047                  * Just feed them all to the fetch method in that case.
1048                  * This condition shouldn't be met in a non-deepening fetch
1049                  * (see builtin-fetch.c:quickfetch()).
1050                  */
1051                 heads = xmalloc(nr_refs * sizeof(*heads));
1052                 for (rm = refs; rm; rm = rm->next)
1053                         heads[nr_heads++] = rm;
1054         }
1055
1056         rc = transport->fetch(transport, nr_heads, heads);
1057
1058         free(heads);
1059         return rc;
1060 }
1061
1062 void transport_unlock_pack(struct transport *transport)
1063 {
1064         if (transport->pack_lockfile) {
1065                 unlink_or_warn(transport->pack_lockfile);
1066                 free(transport->pack_lockfile);
1067                 transport->pack_lockfile = NULL;
1068         }
1069 }
1070
1071 int transport_connect(struct transport *transport, const char *name,
1072                       const char *exec, int fd[2])
1073 {
1074         if (transport->connect)
1075                 return transport->connect(transport, name, exec, fd);
1076         else
1077                 die("Operation not supported by protocol");
1078 }
1079
1080 int transport_disconnect(struct transport *transport)
1081 {
1082         int ret = 0;
1083         if (transport->disconnect)
1084                 ret = transport->disconnect(transport);
1085         free(transport);
1086         return ret;
1087 }
1088
1089 /*
1090  * Strip username (and password) from an url and return
1091  * it in a newly allocated string.
1092  */
1093 char *transport_anonymize_url(const char *url)
1094 {
1095         char *anon_url, *scheme_prefix, *anon_part;
1096         size_t anon_len, prefix_len = 0;
1097
1098         anon_part = strchr(url, '@');
1099         if (is_local(url) || !anon_part)
1100                 goto literal_copy;
1101
1102         anon_len = strlen(++anon_part);
1103         scheme_prefix = strstr(url, "://");
1104         if (!scheme_prefix) {
1105                 if (!strchr(anon_part, ':'))
1106                         /* cannot be "me@there:/path/name" */
1107                         goto literal_copy;
1108         } else {
1109                 const char *cp;
1110                 /* make sure scheme is reasonable */
1111                 for (cp = url; cp < scheme_prefix; cp++) {
1112                         switch (*cp) {
1113                                 /* RFC 1738 2.1 */
1114                         case '+': case '.': case '-':
1115                                 break; /* ok */
1116                         default:
1117                                 if (isalnum(*cp))
1118                                         break;
1119                                 /* it isn't */
1120                                 goto literal_copy;
1121                         }
1122                 }
1123                 /* @ past the first slash does not count */
1124                 cp = strchr(scheme_prefix + 3, '/');
1125                 if (cp && cp < anon_part)
1126                         goto literal_copy;
1127                 prefix_len = scheme_prefix - url + 3;
1128         }
1129         anon_url = xcalloc(1, 1 + prefix_len + anon_len);
1130         memcpy(anon_url, url, prefix_len);
1131         memcpy(anon_url + prefix_len, anon_part, anon_len);
1132         return anon_url;
1133 literal_copy:
1134         return xstrdup(url);
1135 }