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
  13 /* rsync support */
  14
  15 /*
  16  * We copy packed-refs and refs/ into a temporary file, then read the
  17  * loose refs recursively (sorting whenever possible), and then inserting
  18  * those packed refs that are not yet in the list (not validating, but
  19  * assuming that the file is sorted).
  20  *
  21  * Appears refactoring this from refs.c is too cumbersome.
  22  */
  23
  24 static int str_cmp(const void *a, const void *b)
  25 {
  26         const char *s1 = a;
  27         const char *s2 = b;
  28
  29         return strcmp(s1, s2);
  30 }
  31
  32 /* path->buf + name_offset is expected to point to "refs/" */
  33
  34 static int read_loose_refs(struct strbuf *path, int name_offset,
  35                 struct ref **tail)
  36 {
  37         DIR *dir = opendir(path->buf);
  38         struct dirent *de;
  39         struct {
  40                 char **entries;
  41                 int nr, alloc;
  42         } list;
  43         int i, pathlen;
  44
  45         if (!dir)
  46                 return -1;
  47
  48         memset (&list, 0, sizeof(list));
  49
  50         while ((de = readdir(dir))) {
  51                 if (is_dot_or_dotdot(de->d_name))
  52                         continue;
  53                 ALLOC_GROW(list.entries, list.nr + 1, list.alloc);
  54                 list.entries[list.nr++] = xstrdup(de->d_name);
  55         }
  56         closedir(dir);
  57
  58         /* sort the list */
  59
  60         qsort(list.entries, list.nr, sizeof(char *), str_cmp);
  61
  62         pathlen = path->len;
  63         strbuf_addch(path, '/');
  64
  65         for (i = 0; i < list.nr; i++, strbuf_setlen(path, pathlen + 1)) {
  66                 strbuf_addstr(path, list.entries[i]);
  67                 if (read_loose_refs(path, name_offset, tail)) {
  68                         int fd = open(path->buf, O_RDONLY);
  69                         char buffer[40];
  70                         struct ref *next;
  71
  72                         if (fd < 0)
  73                                 continue;
  74                         next = alloc_ref(path->buf + name_offset);
  75                         if (read_in_full(fd, buffer, 40) != 40 ||
  76                                         get_sha1_hex(buffer, next->old_sha1)) {
  77                                 close(fd);
  78                                 free(next);
  79                                 continue;
  80                         }
  81                         close(fd);
  82                         (*tail)->next = next;
  83                         *tail = next;
  84                 }
  85         }
  86         strbuf_setlen(path, pathlen);
  87
  88         for (i = 0; i < list.nr; i++)
  89                 free(list.entries[i]);
  90         free(list.entries);
  91
  92         return 0;
  93 }
  94
  95 /* insert the packed refs for which no loose refs were found */
  96
  97 static void insert_packed_refs(const char *packed_refs, struct ref **list)
  98 {
  99         FILE *f = fopen(packed_refs, "r");
 100         static char buffer[PATH_MAX];
 101
 102         if (!f)
 103                 return;
 104
 105         for (;;) {
 106                 int cmp = cmp, len;
 107
 108                 if (!fgets(buffer, sizeof(buffer), f)) {
 109                         fclose(f);
 110                         return;
 111                 }
 112
 113                 if (hexval(buffer[0]) > 0xf)
 114                         continue;
 115                 len = strlen(buffer);
 116                 if (len && buffer[len - 1] == '\n')
 117                         buffer[--len] = '\0';
 118                 if (len < 41)
 119                         continue;
 120                 while ((*list)->next &&
 121                                 (cmp = strcmp(buffer + 41,
 122                                       (*list)->next->name)) > 0)
 123                         list = &(*list)->next;
 124                 if (!(*list)->next || cmp < 0) {
 125                         struct ref *next = alloc_ref(buffer + 41);
 126                         buffer[40] = '\0';
 127                         if (get_sha1_hex(buffer, next->old_sha1)) {
 128                                 warning ("invalid SHA-1: %s", buffer);
 129                                 free(next);
 130                                 continue;
 131                         }
 132                         next->next = (*list)->next;
 133                         (*list)->next = next;
 134                         list = &(*list)->next;
 135                 }
 136         }
 137 }
 138
 139 static void set_upstreams(struct transport *transport, struct ref *refs,
 140         int pretend)
 141 {
 142         struct ref *ref;
 143         for (ref = refs; ref; ref = ref->next) {
 144                 const char *localname;
 145                 const char *tmp;
 146                 const char *remotename;
 147                 unsigned char sha[20];
 148                 int flag = 0;
 149                 /*
 150                  * Check suitability for tracking. Must be successful /
 151                  * already up-to-date ref create/modify (not delete).
 152                  */
 153                 if (ref->status != REF_STATUS_OK &&
 154                         ref->status != REF_STATUS_UPTODATE)
 155                         continue;
 156                 if (!ref->peer_ref)
 157                         continue;
 158                 if (!ref->new_sha1 || is_null_sha1(ref->new_sha1))
 159                         continue;
 160
 161                 /* Follow symbolic refs (mainly for HEAD). */
 162                 localname = ref->peer_ref->name;
 163                 remotename = ref->name;
 164                 tmp = resolve_ref(localname, sha, 1, &flag);
 165                 if (tmp && flag & REF_ISSYMREF &&
 166                         !prefixcmp(tmp, "refs/heads/"))
 167                         localname = tmp;
 168
 169                 /* Both source and destination must be local branches. */
 170                 if (!localname || prefixcmp(localname, "refs/heads/"))
 171                         continue;
 172                 if (!remotename || prefixcmp(remotename, "refs/heads/"))
 173                         continue;
 174
 175                 if (!pretend)
 176                         install_branch_config(BRANCH_CONFIG_VERBOSE,
 177                                 localname + 11, transport->remote->name,
 178                                 remotename);
 179                 else
 180                         printf("Would set upstream of '%s' to '%s' of '%s'\n",
 181                                 localname + 11, remotename + 11,
 182                                 transport->remote->name);
 183         }
 184 }
 185
 186 static const char *rsync_url(const char *url)
 187 {
 188         return prefixcmp(url, "rsync://") ? skip_prefix(url, "rsync:") : url;
 189 }
 190
 191 static struct ref *get_refs_via_rsync(struct transport *transport, int for_push)
 192 {
 193         struct strbuf buf = STRBUF_INIT, temp_dir = STRBUF_INIT;
 194         struct ref dummy = {0}, *tail = &dummy;
 195         struct child_process rsync;
 196         const char *args[5];
 197         int temp_dir_len;
 198
 199         if (for_push)
 200                 return NULL;
 201
 202         /* copy the refs to the temporary directory */
 203
 204         strbuf_addstr(&temp_dir, git_path("rsync-refs-XXXXXX"));
 205         if (!mkdtemp(temp_dir.buf))
 206                 die_errno ("Could not make temporary directory");
 207         temp_dir_len = temp_dir.len;
 208
 209         strbuf_addstr(&buf, rsync_url(transport->url));
 210         strbuf_addstr(&buf, "/refs");
 211
 212         memset(&rsync, 0, sizeof(rsync));
 213         rsync.argv = args;
 214         rsync.stdout_to_stderr = 1;
 215         args[0] = "rsync";
 216         args[1] = (transport->verbose > 0) ? "-rv" : "-r";
 217         args[2] = buf.buf;
 218         args[3] = temp_dir.buf;
 219         args[4] = NULL;
 220
 221         if (run_command(&rsync))
 222                 die ("Could not run rsync to get refs");
 223
 224         strbuf_reset(&buf);
 225         strbuf_addstr(&buf, rsync_url(transport->url));
 226         strbuf_addstr(&buf, "/packed-refs");
 227
 228         args[2] = buf.buf;
 229
 230         if (run_command(&rsync))
 231                 die ("Could not run rsync to get refs");
 232
 233         /* read the copied refs */
 234
 235         strbuf_addstr(&temp_dir, "/refs");
 236         read_loose_refs(&temp_dir, temp_dir_len + 1, &tail);
 237         strbuf_setlen(&temp_dir, temp_dir_len);
 238
 239         tail = &dummy;
 240         strbuf_addstr(&temp_dir, "/packed-refs");
 241         insert_packed_refs(temp_dir.buf, &tail);
 242         strbuf_setlen(&temp_dir, temp_dir_len);
 243
 244         if (remove_dir_recursively(&temp_dir, 0))
 245                 warning ("Error removing temporary directory %s.",
 246                                 temp_dir.buf);
 247
 248         strbuf_release(&buf);
 249         strbuf_release(&temp_dir);
 250
 251         return dummy.next;
 252 }
 253
 254 static int fetch_objs_via_rsync(struct transport *transport,
 255                                 int nr_objs, struct ref **to_fetch)
 256 {
 257         struct strbuf buf = STRBUF_INIT;
 258         struct child_process rsync;
 259         const char *args[8];
 260         int result;
 261
 262         strbuf_addstr(&buf, rsync_url(transport->url));
 263         strbuf_addstr(&buf, "/objects/");
 264
 265         memset(&rsync, 0, sizeof(rsync));
 266         rsync.argv = args;
 267         rsync.stdout_to_stderr = 1;
 268         args[0] = "rsync";
 269         args[1] = (transport->verbose > 0) ? "-rv" : "-r";
 270         args[2] = "--ignore-existing";
 271         args[3] = "--exclude";
 272         args[4] = "info";
 273         args[5] = buf.buf;
 274         args[6] = get_object_directory();
 275         args[7] = NULL;
 276
 277         /* NEEDSWORK: handle one level of alternates */
 278         result = run_command(&rsync);
 279
 280         strbuf_release(&buf);
 281
 282         return result;
 283 }
 284
 285 static int write_one_ref(const char *name, const unsigned char *sha1,
 286                 int flags, void *data)
 287 {
 288         struct strbuf *buf = data;
 289         int len = buf->len;
 290         FILE *f;
 291
 292         /* when called via for_each_ref(), flags is non-zero */
 293         if (flags && prefixcmp(name, "refs/heads/") &&
 294                         prefixcmp(name, "refs/tags/"))
 295                 return 0;
 296
 297         strbuf_addstr(buf, name);
 298         if (safe_create_leading_directories(buf->buf) ||
 299                         !(f = fopen(buf->buf, "w")) ||
 300                         fprintf(f, "%s\n", sha1_to_hex(sha1)) < 0 ||
 301                         fclose(f))
 302                 return error("problems writing temporary file %s", buf->buf);
 303         strbuf_setlen(buf, len);
 304         return 0;
 305 }
 306
 307 static int write_refs_to_temp_dir(struct strbuf *temp_dir,
 308                 int refspec_nr, const char **refspec)
 309 {
 310         int i;
 311
 312         for (i = 0; i < refspec_nr; i++) {
 313                 unsigned char sha1[20];
 314                 char *ref;
 315
 316                 if (dwim_ref(refspec[i], strlen(refspec[i]), sha1, &ref) != 1)
 317                         return error("Could not get ref %s", refspec[i]);
 318
 319                 if (write_one_ref(ref, sha1, 0, temp_dir)) {
 320                         free(ref);
 321                         return -1;
 322                 }
 323                 free(ref);
 324         }
 325         return 0;
 326 }
 327
 328 static int rsync_transport_push(struct transport *transport,
 329                 int refspec_nr, const char **refspec, int flags)
 330 {
 331         struct strbuf buf = STRBUF_INIT, temp_dir = STRBUF_INIT;
 332         int result = 0, i;
 333         struct child_process rsync;
 334         const char *args[10];
 335
 336         if (flags & TRANSPORT_PUSH_MIRROR)
 337                 return error("rsync transport does not support mirror mode");
 338
 339         /* first push the objects */
 340
 341         strbuf_addstr(&buf, rsync_url(transport->url));
 342         strbuf_addch(&buf, '/');
 343
 344         memset(&rsync, 0, sizeof(rsync));
 345         rsync.argv = args;
 346         rsync.stdout_to_stderr = 1;
 347         i = 0;
 348         args[i++] = "rsync";
 349         args[i++] = "-a";
 350         if (flags & TRANSPORT_PUSH_DRY_RUN)
 351                 args[i++] = "--dry-run";
 352         if (transport->verbose > 0)
 353                 args[i++] = "-v";
 354         args[i++] = "--ignore-existing";
 355         args[i++] = "--exclude";
 356         args[i++] = "info";
 357         args[i++] = get_object_directory();
 358         args[i++] = buf.buf;
 359         args[i++] = NULL;
 360
 361         if (run_command(&rsync))
 362                 return error("Could not push objects to %s",
 363                                 rsync_url(transport->url));
 364
 365         /* copy the refs to the temporary directory; they could be packed. */
 366
 367         strbuf_addstr(&temp_dir, git_path("rsync-refs-XXXXXX"));
 368         if (!mkdtemp(temp_dir.buf))
 369                 die_errno ("Could not make temporary directory");
 370         strbuf_addch(&temp_dir, '/');
 371
 372         if (flags & TRANSPORT_PUSH_ALL) {
 373                 if (for_each_ref(write_one_ref, &temp_dir))
 374                         return -1;
 375         } else if (write_refs_to_temp_dir(&temp_dir, refspec_nr, refspec))
 376                 return -1;
 377
 378         i = 2;
 379         if (flags & TRANSPORT_PUSH_DRY_RUN)
 380                 args[i++] = "--dry-run";
 381         if (!(flags & TRANSPORT_PUSH_FORCE))
 382                 args[i++] = "--ignore-existing";
 383         args[i++] = temp_dir.buf;
 384         args[i++] = rsync_url(transport->url);
 385         args[i++] = NULL;
 386         if (run_command(&rsync))
 387                 result = error("Could not push to %s",
 388                                 rsync_url(transport->url));
 389
 390         if (remove_dir_recursively(&temp_dir, 0))
 391                 warning ("Could not remove temporary directory %s.",
 392                                 temp_dir.buf);
 393
 394         strbuf_release(&buf);
 395         strbuf_release(&temp_dir);
 396
 397         return result;
 398 }
 399
 400 struct bundle_transport_data {
 401         int fd;
 402         struct bundle_header header;
 403 };
 404
 405 static struct ref *get_refs_from_bundle(struct transport *transport, int for_push)
 406 {
 407         struct bundle_transport_data *data = transport->data;
 408         struct ref *result = NULL;
 409         int i;
 410
 411         if (for_push)
 412                 return NULL;
 413
 414         if (data->fd > 0)
 415                 close(data->fd);
 416         data->fd = read_bundle_header(transport->url, &data->header);
 417         if (data->fd < 0)
 418                 die ("Could not read bundle '%s'.", transport->url);
 419         for (i = 0; i < data->header.references.nr; i++) {
 420                 struct ref_list_entry *e = data->header.references.list + i;
 421                 struct ref *ref = alloc_ref(e->name);
 422                 hashcpy(ref->old_sha1, e->sha1);
 423                 ref->next = result;
 424                 result = ref;
 425         }
 426         return result;
 427 }
 428
 429 static int fetch_refs_from_bundle(struct transport *transport,
 430                                int nr_heads, struct ref **to_fetch)
 431 {
 432         struct bundle_transport_data *data = transport->data;
 433         return unbundle(&data->header, data->fd);
 434 }
 435
 436 static int close_bundle(struct transport *transport)
 437 {
 438         struct bundle_transport_data *data = transport->data;
 439         if (data->fd > 0)
 440                 close(data->fd);
 441         free(data);
 442         return 0;
 443 }
 444
 445 struct git_transport_data {
 446         struct git_transport_options options;
 447         struct child_process *conn;
 448         int fd[2];
 449         unsigned got_remote_heads : 1;
 450         struct extra_have_objects extra_have;
 451 };
 452
 453 static int set_git_option(struct git_transport_options *opts,
 454                           const char *name, const char *value)
 455 {
 456         if (!strcmp(name, TRANS_OPT_UPLOADPACK)) {
 457                 opts->uploadpack = value;
 458                 return 0;
 459         } else if (!strcmp(name, TRANS_OPT_RECEIVEPACK)) {
 460                 opts->receivepack = value;
 461                 return 0;
 462         } else if (!strcmp(name, TRANS_OPT_THIN)) {
 463                 opts->thin = !!value;
 464                 return 0;
 465         } else if (!strcmp(name, TRANS_OPT_FOLLOWTAGS)) {
 466                 opts->followtags = !!value;
 467                 return 0;
 468         } else if (!strcmp(name, TRANS_OPT_KEEP)) {
 469                 opts->keep = !!value;
 470                 return 0;
 471         } else if (!strcmp(name, TRANS_OPT_DEPTH)) {
 472                 if (!value)
 473                         opts->depth = 0;
 474                 else
 475                         opts->depth = atoi(value);
 476                 return 0;
 477         }
 478         return 1;
 479 }
 480
 481 static int connect_setup(struct transport *transport, int for_push, int verbose)
 482 {
 483         struct git_transport_data *data = transport->data;
 484
 485         if (data->conn)
 486                 return 0;
 487
 488         data->conn = git_connect(data->fd, transport->url,
 489                                  for_push ? data->options.receivepack :
 490                                  data->options.uploadpack,
 491                                  verbose ? CONNECT_VERBOSE : 0);
 492
 493         return 0;
 494 }
 495
 496 static struct ref *get_refs_via_connect(struct transport *transport, int for_push)
 497 {
 498         struct git_transport_data *data = transport->data;
 499         struct ref *refs;
 500
 501         connect_setup(transport, for_push, 0);
 502         get_remote_heads(data->fd[0], &refs, 0, NULL,
 503                          for_push ? REF_NORMAL : 0, &data->extra_have);
 504         data->got_remote_heads = 1;
 505
 506         return refs;
 507 }
 508
 509 static int fetch_refs_via_pack(struct transport *transport,
 510                                int nr_heads, struct ref **to_fetch)
 511 {
 512         struct git_transport_data *data = transport->data;
 513         char **heads = xmalloc(nr_heads * sizeof(*heads));
 514         char **origh = xmalloc(nr_heads * sizeof(*origh));
 515         const struct ref *refs;
 516         char *dest = xstrdup(transport->url);
 517         struct fetch_pack_args args;
 518         int i;
 519         struct ref *refs_tmp = NULL;
 520
 521         memset(&args, 0, sizeof(args));
 522         args.uploadpack = data->options.uploadpack;
 523         args.keep_pack = data->options.keep;
 524         args.lock_pack = 1;
 525         args.use_thin_pack = data->options.thin;
 526         args.include_tag = data->options.followtags;
 527         args.verbose = (transport->verbose > 0);
 528         args.quiet = (transport->verbose < 0);
 529         args.no_progress = args.quiet || (!transport->progress && !isatty(2));
 530         args.depth = data->options.depth;
 531
 532         for (i = 0; i < nr_heads; i++)
 533                 origh[i] = heads[i] = xstrdup(to_fetch[i]->name);
 534
 535         if (!data->got_remote_heads) {
 536                 connect_setup(transport, 0, 0);
 537                 get_remote_heads(data->fd[0], &refs_tmp, 0, NULL, 0, NULL);
 538                 data->got_remote_heads = 1;
 539         }
 540
 541         refs = fetch_pack(&args, data->fd, data->conn,
 542                           refs_tmp ? refs_tmp : transport->remote_refs,
 543                           dest, nr_heads, heads, &transport->pack_lockfile);
 544         close(data->fd[0]);
 545         close(data->fd[1]);
 546         if (finish_connect(data->conn))
 547                 refs = NULL;
 548         data->conn = NULL;
 549         data->got_remote_heads = 0;
 550
 551         free_refs(refs_tmp);
 552
 553         for (i = 0; i < nr_heads; i++)
 554                 free(origh[i]);
 555         free(origh);
 556         free(heads);
 557         free(dest);
 558         return (refs ? 0 : -1);
 559 }
 560
 561 static int push_had_errors(struct ref *ref)
 562 {
 563         for (; ref; ref = ref->next) {
 564                 switch (ref->status) {
 565                 case REF_STATUS_NONE:
 566                 case REF_STATUS_UPTODATE:
 567                 case REF_STATUS_OK:
 568                         break;
 569                 default:
 570                         return 1;
 571                 }
 572         }
 573         return 0;
 574 }
 575
 576 int transport_refs_pushed(struct ref *ref)
 577 {
 578         for (; ref; ref = ref->next) {
 579                 switch(ref->status) {
 580                 case REF_STATUS_NONE:
 581                 case REF_STATUS_UPTODATE:
 582                         break;
 583                 default:
 584                         return 1;
 585                 }
 586         }
 587         return 0;
 588 }
 589
 590 void transport_update_tracking_ref(struct remote *remote, struct ref *ref, int verbose)
 591 {
 592         struct refspec rs;
 593
 594         if (ref->status != REF_STATUS_OK && ref->status != REF_STATUS_UPTODATE)
 595                 return;
 596
 597         rs.src = ref->name;
 598         rs.dst = NULL;
 599
 600         if (!remote_find_tracking(remote, &rs)) {
 601                 if (verbose)
 602                         fprintf(stderr, "updating local tracking ref '%s'\n", rs.dst);
 603                 if (ref->deletion) {
 604                         delete_ref(rs.dst, NULL, 0);
 605                 } else
 606                         update_ref("update by push", rs.dst,
 607                                         ref->new_sha1, NULL, 0, 0);
 608                 free(rs.dst);
 609         }
 610 }
 611
 612 static void print_ref_status(char flag, const char *summary, struct ref *to, struct ref *from, const char *msg, int porcelain)
 613 {
 614         if (porcelain) {
 615                 if (from)
 616                         fprintf(stdout, "%c\t%s:%s\t", flag, from->name, to->name);
 617                 else
 618                         fprintf(stdout, "%c\t:%s\t", flag, to->name);
 619                 if (msg)
 620                         fprintf(stdout, "%s (%s)\n", summary, msg);
 621                 else
 622                         fprintf(stdout, "%s\n", summary);
 623         } else {
 624                 fprintf(stderr, " %c %-*s ", flag, TRANSPORT_SUMMARY_WIDTH, summary);
 625                 if (from)
 626                         fprintf(stderr, "%s -> %s", prettify_refname(from->name), prettify_refname(to->name));
 627                 else
 628                         fputs(prettify_refname(to->name), stderr);
 629                 if (msg) {
 630                         fputs(" (", stderr);
 631                         fputs(msg, stderr);
 632                         fputc(')', stderr);
 633                 }
 634                 fputc('\n', stderr);
 635         }
 636 }
 637
 638 static const char *status_abbrev(unsigned char sha1[20])
 639 {
 640         return find_unique_abbrev(sha1, DEFAULT_ABBREV);
 641 }
 642
 643 static void print_ok_ref_status(struct ref *ref, int porcelain)
 644 {
 645         if (ref->deletion)
 646                 print_ref_status('-', "[deleted]", ref, NULL, NULL, porcelain);
 647         else if (is_null_sha1(ref->old_sha1))
 648                 print_ref_status('*',
 649                         (!prefixcmp(ref->name, "refs/tags/") ? "[new tag]" :
 650                         "[new branch]"),
 651                         ref, ref->peer_ref, NULL, porcelain);
 652         else {
 653                 char quickref[84];
 654                 char type;
 655                 const char *msg;
 656
 657                 strcpy(quickref, status_abbrev(ref->old_sha1));
 658                 if (ref->nonfastforward) {
 659                         strcat(quickref, "...");
 660                         type = '+';
 661                         msg = "forced update";
 662                 } else {
 663                         strcat(quickref, "..");
 664                         type = ' ';
 665                         msg = NULL;
 666                 }
 667                 strcat(quickref, status_abbrev(ref->new_sha1));
 668
 669                 print_ref_status(type, quickref, ref, ref->peer_ref, msg, porcelain);
 670         }
 671 }
 672
 673 static int print_one_push_status(struct ref *ref, const char *dest, int count, int porcelain)
 674 {
 675         if (!count)
 676                 fprintf(porcelain ? stdout : stderr, "To %s\n", dest);
 677
 678         switch(ref->status) {
 679         case REF_STATUS_NONE:
 680                 print_ref_status('X', "[no match]", ref, NULL, NULL, porcelain);
 681                 break;
 682         case REF_STATUS_REJECT_NODELETE:
 683                 print_ref_status('!', "[rejected]", ref, NULL,
 684                                                  "remote does not support deleting refs", porcelain);
 685                 break;
 686         case REF_STATUS_UPTODATE:
 687                 print_ref_status('=', "[up to date]", ref,
 688                                                  ref->peer_ref, NULL, porcelain);
 689                 break;
 690         case REF_STATUS_REJECT_NONFASTFORWARD:
 691                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 692                                                  "non-fast-forward", porcelain);
 693                 break;
 694         case REF_STATUS_REMOTE_REJECT:
 695                 print_ref_status('!', "[remote rejected]", ref,
 696                                                  ref->deletion ? NULL : ref->peer_ref,
 697                                                  ref->remote_status, porcelain);
 698                 break;
 699         case REF_STATUS_EXPECTING_REPORT:
 700                 print_ref_status('!', "[remote failure]", ref,
 701                                                  ref->deletion ? NULL : ref->peer_ref,
 702                                                  "remote failed to report status", porcelain);
 703                 break;
 704         case REF_STATUS_OK:
 705                 print_ok_ref_status(ref, porcelain);
 706                 break;
 707         }
 708
 709         return 1;
 710 }
 711
 712 void transport_print_push_status(const char *dest, struct ref *refs,
 713                                   int verbose, int porcelain, int *nonfastforward)
 714 {
 715         struct ref *ref;
 716         int n = 0;
 717
 718         if (verbose) {
 719                 for (ref = refs; ref; ref = ref->next)
 720                         if (ref->status == REF_STATUS_UPTODATE)
 721                                 n += print_one_push_status(ref, dest, n, porcelain);
 722         }
 723
 724         for (ref = refs; ref; ref = ref->next)
 725                 if (ref->status == REF_STATUS_OK)
 726                         n += print_one_push_status(ref, dest, n, porcelain);
 727
 728         *nonfastforward = 0;
 729         for (ref = refs; ref; ref = ref->next) {
 730                 if (ref->status != REF_STATUS_NONE &&
 731                     ref->status != REF_STATUS_UPTODATE &&
 732                     ref->status != REF_STATUS_OK)
 733                         n += print_one_push_status(ref, dest, n, porcelain);
 734                 if (ref->status == REF_STATUS_REJECT_NONFASTFORWARD)
 735                         *nonfastforward = 1;
 736         }
 737 }
 738
 739 void transport_verify_remote_names(int nr_heads, const char **heads)
 740 {
 741         int i;
 742
 743         for (i = 0; i < nr_heads; i++) {
 744                 const char *local = heads[i];
 745                 const char *remote = strrchr(heads[i], ':');
 746
 747                 if (*local == '+')
 748                         local++;
 749
 750                 /* A matching refspec is okay.  */
 751                 if (remote == local && remote[1] == '\0')
 752                         continue;
 753
 754                 remote = remote ? (remote + 1) : local;
 755                 switch (check_ref_format(remote)) {
 756                 case 0: /* ok */
 757                 case CHECK_REF_FORMAT_ONELEVEL:
 758                         /* ok but a single level -- that is fine for
 759                          * a match pattern.
 760                          */
 761                 case CHECK_REF_FORMAT_WILDCARD:
 762                         /* ok but ends with a pattern-match character */
 763                         continue;
 764                 }
 765                 die("remote part of refspec is not a valid name in %s",
 766                     heads[i]);
 767         }
 768 }
 769
 770 static int git_transport_push(struct transport *transport, struct ref *remote_refs, int flags)
 771 {
 772         struct git_transport_data *data = transport->data;
 773         struct send_pack_args args;
 774         int ret;
 775
 776         if (!data->got_remote_heads) {
 777                 struct ref *tmp_refs;
 778                 connect_setup(transport, 1, 0);
 779
 780                 get_remote_heads(data->fd[0], &tmp_refs, 0, NULL, REF_NORMAL,
 781                                  NULL);
 782                 data->got_remote_heads = 1;
 783         }
 784
 785         memset(&args, 0, sizeof(args));
 786         args.send_mirror = !!(flags & TRANSPORT_PUSH_MIRROR);
 787         args.force_update = !!(flags & TRANSPORT_PUSH_FORCE);
 788         args.use_thin_pack = data->options.thin;
 789         args.verbose = !!(flags & TRANSPORT_PUSH_VERBOSE);
 790         args.quiet = !!(flags & TRANSPORT_PUSH_QUIET);
 791         args.dry_run = !!(flags & TRANSPORT_PUSH_DRY_RUN);
 792         args.porcelain = !!(flags & TRANSPORT_PUSH_PORCELAIN);
 793
 794         ret = send_pack(&args, data->fd, data->conn, remote_refs,
 795                         &data->extra_have);
 796
 797         close(data->fd[1]);
 798         close(data->fd[0]);
 799         ret |= finish_connect(data->conn);
 800         data->conn = NULL;
 801         data->got_remote_heads = 0;
 802
 803         return ret;
 804 }
 805
 806 static int connect_git(struct transport *transport, const char *name,
 807                        const char *executable, int fd[2])
 808 {
 809         struct git_transport_data *data = transport->data;
 810         data->conn = git_connect(data->fd, transport->url,
 811                                  executable, 0);
 812         fd[0] = data->fd[0];
 813         fd[1] = data->fd[1];
 814         return 0;
 815 }
 816
 817 static int disconnect_git(struct transport *transport)
 818 {
 819         struct git_transport_data *data = transport->data;
 820         if (data->conn) {
 821                 if (data->got_remote_heads)
 822                         packet_flush(data->fd[1]);
 823                 close(data->fd[0]);
 824                 close(data->fd[1]);
 825                 finish_connect(data->conn);
 826         }
 827
 828         free(data);
 829         return 0;
 830 }
 831
 832 void transport_take_over(struct transport *transport,
 833                          struct child_process *child)
 834 {
 835         struct git_transport_data *data;
 836
 837         if (!transport->smart_options)
 838                 die("Bug detected: Taking over transport requires non-NULL "
 839                     "smart_options field.");
 840
 841         data = xcalloc(1, sizeof(*data));
 842         data->options = *transport->smart_options;
 843         data->conn = child;
 844         data->fd[0] = data->conn->out;
 845         data->fd[1] = data->conn->in;
 846         data->got_remote_heads = 0;
 847         transport->data = data;
 848
 849         transport->set_option = NULL;
 850         transport->get_refs_list = get_refs_via_connect;
 851         transport->fetch = fetch_refs_via_pack;
 852         transport->push = NULL;
 853         transport->push_refs = git_transport_push;
 854         transport->disconnect = disconnect_git;
 855         transport->smart_options = &(data->options);
 856 }
 857
 858 static int is_local(const char *url)
 859 {
 860         const char *colon = strchr(url, ':');
 861         const char *slash = strchr(url, '/');
 862         return !colon || (slash && slash < colon) ||
 863                 has_dos_drive_prefix(url);
 864 }
 865
 866 static int is_file(const char *url)
 867 {
 868         struct stat buf;
 869         if (stat(url, &buf))
 870                 return 0;
 871         return S_ISREG(buf.st_mode);
 872 }
 873
 874 static int isurlschemechar(int first_flag, int ch)
 875 {
 876         /*
 877          * The set of valid URL schemes, as per STD66 (RFC3986) is
 878          * '[A-Za-z][A-Za-z0-9+.-]*'. But use sightly looser check
 879          * of '[A-Za-z0-9][A-Za-z0-9+.-]*' because earlier version
 880          * of check used '[A-Za-z0-9]+' so not to break any remote
 881          * helpers.
 882          */
 883         int alphanumeric, special;
 884         alphanumeric = ch > 0 && isalnum(ch);
 885         special = ch == '+' || ch == '-' || ch == '.';
 886         return alphanumeric || (!first_flag && special);
 887 }
 888
 889 static int is_url(const char *url)
 890 {
 891         const char *url2, *first_slash;
 892
 893         if (!url)
 894                 return 0;
 895         url2 = url;
 896         first_slash = strchr(url, '/');
 897
 898         /* Input with no slash at all or slash first can't be URL. */
 899         if (!first_slash || first_slash == url)
 900                 return 0;
 901         /* Character before must be : and next must be /. */
 902         if (first_slash[-1] != ':' || first_slash[1] != '/')
 903                 return 0;
 904         /* There must be something before the :// */
 905         if (first_slash == url + 1)
 906                 return 0;
 907         /*
 908          * Check all characters up to first slash - 1. Only alphanum
 909          * is allowed.
 910          */
 911         url2 = url;
 912         while (url2 < first_slash - 1) {
 913                 if (!isurlschemechar(url2 == url, (unsigned char)*url2))
 914                         return 0;
 915                 url2++;
 916         }
 917
 918         /* Valid enough. */
 919         return 1;
 920 }
 921
 922 static int external_specification_len(const char *url)
 923 {
 924         return strchr(url, ':') - url;
 925 }
 926
 927 struct transport *transport_get(struct remote *remote, const char *url)
 928 {
 929         const char *helper;
 930         struct transport *ret = xcalloc(1, sizeof(*ret));
 931
 932         if (!remote)
 933                 die("No remote provided to transport_get()");
 934
 935         ret->got_remote_refs = 0;
 936         ret->remote = remote;
 937         helper = remote->foreign_vcs;
 938
 939         if (!url && remote->url)
 940                 url = remote->url[0];
 941         ret->url = url;
 942
 943         /* maybe it is a foreign URL? */
 944         if (url) {
 945                 const char *p = url;
 946
 947                 while (isurlschemechar(p == url, *p))
 948                         p++;
 949                 if (!prefixcmp(p, "::"))
 950                         helper = xstrndup(url, p - url);
 951         }
 952
 953         if (helper) {
 954                 transport_helper_init(ret, helper);
 955         } else if (!prefixcmp(url, "rsync:")) {
 956                 ret->get_refs_list = get_refs_via_rsync;
 957                 ret->fetch = fetch_objs_via_rsync;
 958                 ret->push = rsync_transport_push;
 959                 ret->smart_options = NULL;
 960         } else if (is_local(url) && is_file(url)) {
 961                 struct bundle_transport_data *data = xcalloc(1, sizeof(*data));
 962                 ret->data = data;
 963                 ret->get_refs_list = get_refs_from_bundle;
 964                 ret->fetch = fetch_refs_from_bundle;
 965                 ret->disconnect = close_bundle;
 966                 ret->smart_options = NULL;
 967         } else if (!is_url(url)
 968                 || !prefixcmp(url, "file://")
 969                 || !prefixcmp(url, "git://")
 970                 || !prefixcmp(url, "ssh://")
 971                 || !prefixcmp(url, "git+ssh://")
 972                 || !prefixcmp(url, "ssh+git://")) {
 973                 /* These are builtin smart transports. */
 974                 struct git_transport_data *data = xcalloc(1, sizeof(*data));
 975                 ret->data = data;
 976                 ret->set_option = NULL;
 977                 ret->get_refs_list = get_refs_via_connect;
 978                 ret->fetch = fetch_refs_via_pack;
 979                 ret->push_refs = git_transport_push;
 980                 ret->connect = connect_git;
 981                 ret->disconnect = disconnect_git;
 982                 ret->smart_options = &(data->options);
 983
 984                 data->conn = NULL;
 985                 data->got_remote_heads = 0;
 986         } else {
 987                 /* Unknown protocol in URL. Pass to external handler. */
 988                 int len = external_specification_len(url);
 989                 char *handler = xmalloc(len + 1);
 990                 handler[len] = 0;
 991                 strncpy(handler, url, len);
 992                 transport_helper_init(ret, handler);
 993         }
 994
 995         if (ret->smart_options) {
 996                 ret->smart_options->thin = 1;
 997                 ret->smart_options->uploadpack = "git-upload-pack";
 998                 if (remote->uploadpack)
 999                         ret->smart_options->uploadpack = remote->uploadpack;
1000                 ret->smart_options->receivepack = "git-receive-pack";
1001                 if (remote->receivepack)
1002                         ret->smart_options->receivepack = remote->receivepack;
1003         }
1004
1005         return ret;
1006 }
1007
1008 int transport_set_option(struct transport *transport,
1009                          const char *name, const char *value)
1010 {
1011         int git_reports = 1, protocol_reports = 1;
1012
1013         if (transport->smart_options)
1014                 git_reports = set_git_option(transport->smart_options,
1015                                              name, value);
1016
1017         if (transport->set_option)
1018                 protocol_reports = transport->set_option(transport, name,
1019                                                         value);
1020
1021         /* If either report is 0, report 0 (success). */
1022         if (!git_reports || !protocol_reports)
1023                 return 0;
1024         /* If either reports -1 (invalid value), report -1. */
1025         if ((git_reports == -1) || (protocol_reports == -1))
1026                 return -1;
1027         /* Otherwise if both report unknown, report unknown. */
1028         return 1;
1029 }
1030
1031 int transport_push(struct transport *transport,
1032                    int refspec_nr, const char **refspec, int flags,
1033                    int *nonfastforward)
1034 {
1035         *nonfastforward = 0;
1036         transport_verify_remote_names(refspec_nr, refspec);
1037
1038         if (transport->push) {
1039                 /* Maybe FIXME. But no important transport uses this case. */
1040                 if (flags & TRANSPORT_PUSH_SET_UPSTREAM)
1041                         die("This transport does not support using --set-upstream");
1042
1043                 return transport->push(transport, refspec_nr, refspec, flags);
1044         } else if (transport->push_refs) {
1045                 struct ref *remote_refs =
1046                         transport->get_refs_list(transport, 1);
1047                 struct ref *local_refs = get_local_heads();
1048                 int match_flags = MATCH_REFS_NONE;
1049                 int verbose = flags & TRANSPORT_PUSH_VERBOSE;
1050                 int quiet = flags & TRANSPORT_PUSH_QUIET;
1051                 int porcelain = flags & TRANSPORT_PUSH_PORCELAIN;
1052                 int pretend = flags & TRANSPORT_PUSH_DRY_RUN;
1053                 int push_ret, ret, err;
1054
1055                 if (flags & TRANSPORT_PUSH_ALL)
1056                         match_flags |= MATCH_REFS_ALL;
1057                 if (flags & TRANSPORT_PUSH_MIRROR)
1058                         match_flags |= MATCH_REFS_MIRROR;
1059
1060                 if (match_refs(local_refs, &remote_refs,
1061                                refspec_nr, refspec, match_flags)) {
1062                         return -1;
1063                 }
1064
1065                 set_ref_status_for_push(remote_refs,
1066                         flags & TRANSPORT_PUSH_MIRROR,
1067                         flags & TRANSPORT_PUSH_FORCE);
1068
1069                 push_ret = transport->push_refs(transport, remote_refs, flags);
1070                 err = push_had_errors(remote_refs);
1071                 ret = push_ret | err;
1072
1073                 if (!quiet || err)
1074                         transport_print_push_status(transport->url, remote_refs,
1075                                         verbose | porcelain, porcelain,
1076                                         nonfastforward);
1077
1078                 if (flags & TRANSPORT_PUSH_SET_UPSTREAM)
1079                         set_upstreams(transport, remote_refs, pretend);
1080
1081                 if (!(flags & TRANSPORT_PUSH_DRY_RUN)) {
1082                         struct ref *ref;
1083                         for (ref = remote_refs; ref; ref = ref->next)
1084                                 transport_update_tracking_ref(transport->remote, ref, verbose);
1085                 }
1086
1087                 if (porcelain && !push_ret)
1088                         puts("Done");
1089                 else if (!quiet && !ret && !transport_refs_pushed(remote_refs))
1090                         fprintf(stderr, "Everything up-to-date\n");
1091
1092                 return ret;
1093         }
1094         return 1;
1095 }
1096
1097 const struct ref *transport_get_remote_refs(struct transport *transport)
1098 {
1099         if (!transport->got_remote_refs) {
1100                 transport->remote_refs = transport->get_refs_list(transport, 0);
1101                 transport->got_remote_refs = 1;
1102         }
1103
1104         return transport->remote_refs;
1105 }
1106
1107 int transport_fetch_refs(struct transport *transport, struct ref *refs)
1108 {
1109         int rc;
1110         int nr_heads = 0, nr_alloc = 0, nr_refs = 0;
1111         struct ref **heads = NULL;
1112         struct ref *rm;
1113
1114         for (rm = refs; rm; rm = rm->next) {
1115                 nr_refs++;
1116                 if (rm->peer_ref &&
1117                     !is_null_sha1(rm->old_sha1) &&
1118                     !hashcmp(rm->peer_ref->old_sha1, rm->old_sha1))
1119                         continue;
1120                 ALLOC_GROW(heads, nr_heads + 1, nr_alloc);
1121                 heads[nr_heads++] = rm;
1122         }
1123
1124         if (!nr_heads) {
1125                 /*
1126                  * When deepening of a shallow repository is requested,
1127                  * then local and remote refs are likely to still be equal.
1128                  * Just feed them all to the fetch method in that case.
1129                  * This condition shouldn't be met in a non-deepening fetch
1130                  * (see builtin-fetch.c:quickfetch()).
1131                  */
1132                 heads = xmalloc(nr_refs * sizeof(*heads));
1133                 for (rm = refs; rm; rm = rm->next)
1134                         heads[nr_heads++] = rm;
1135         }
1136
1137         rc = transport->fetch(transport, nr_heads, heads);
1138
1139         free(heads);
1140         return rc;
1141 }
1142
1143 void transport_unlock_pack(struct transport *transport)
1144 {
1145         if (transport->pack_lockfile) {
1146                 unlink_or_warn(transport->pack_lockfile);
1147                 free(transport->pack_lockfile);
1148                 transport->pack_lockfile = NULL;
1149         }
1150 }
1151
1152 int transport_connect(struct transport *transport, const char *name,
1153                       const char *exec, int fd[2])
1154 {
1155         if (transport->connect)
1156                 return transport->connect(transport, name, exec, fd);
1157         else
1158                 die("Operation not supported by protocol");
1159 }
1160
1161 int transport_disconnect(struct transport *transport)
1162 {
1163         int ret = 0;
1164         if (transport->disconnect)
1165                 ret = transport->disconnect(transport);
1166         free(transport);
1167         return ret;
1168 }
1169
1170 /*
1171  * Strip username (and password) from an url and return
1172  * it in a newly allocated string.
1173  */
1174 char *transport_anonymize_url(const char *url)
1175 {
1176         char *anon_url, *scheme_prefix, *anon_part;
1177         size_t anon_len, prefix_len = 0;
1178
1179         anon_part = strchr(url, '@');
1180         if (is_local(url) || !anon_part)
1181                 goto literal_copy;
1182
1183         anon_len = strlen(++anon_part);
1184         scheme_prefix = strstr(url, "://");
1185         if (!scheme_prefix) {
1186                 if (!strchr(anon_part, ':'))
1187                         /* cannot be "me@there:/path/name" */
1188                         goto literal_copy;
1189         } else {
1190                 const char *cp;
1191                 /* make sure scheme is reasonable */
1192                 for (cp = url; cp < scheme_prefix; cp++) {
1193                         switch (*cp) {
1194                                 /* RFC 1738 2.1 */
1195                         case '+': case '.': case '-':
1196                                 break; /* ok */
1197                         default:
1198                                 if (isalnum(*cp))
1199                                         break;
1200                                 /* it isn't */
1201                                 goto literal_copy;
1202                         }
1203                 }
1204                 /* @ past the first slash does not count */
1205                 cp = strchr(scheme_prefix + 3, '/');
1206                 if (cp && cp < anon_part)
1207                         goto literal_copy;
1208                 prefix_len = scheme_prefix - url + 3;
1209         }
1210         anon_url = xcalloc(1, 1 + prefix_len + anon_len);
1211         memcpy(anon_url, url, prefix_len);
1212         memcpy(anon_url + prefix_len, anon_part, anon_len);
1213         return anon_url;
1214 literal_copy:
1215         return xstrdup(url);
1216 }