builtin-send-pack.c

   1 #include "cache.h"
   2 #include "commit.h"
   3 #include "tag.h"
   4 #include "refs.h"
   5 #include "pkt-line.h"
   6 #include "run-command.h"
   7 #include "remote.h"
   8 #include "send-pack.h"
   9
  10 static const char send_pack_usage[] =
  11 "git send-pack [--all | --mirror] [--dry-run] [--force] [--receive-pack=<git-receive-pack>] [--verbose] [--thin] [<host>:]<directory> [<ref>...]\n"
  12 "  --all and explicit <ref> specification are mutually exclusive.";
  13
  14 static struct send_pack_args args = {
  15         /* .receivepack = */ "git-receive-pack",
  16 };
  17
  18 /*
  19  * Make a pack stream and spit it out into file descriptor fd
  20  */
  21 static int pack_objects(int fd, struct ref *refs)
  22 {
  23         /*
  24          * The child becomes pack-objects --revs; we feed
  25          * the revision parameters to it via its stdin and
  26          * let its stdout go back to the other end.
  27          */
  28         const char *argv[] = {
  29                 "pack-objects",
  30                 "--all-progress",
  31                 "--revs",
  32                 "--stdout",
  33                 NULL,
  34                 NULL,
  35         };
  36         struct child_process po;
  37
  38         if (args.use_thin_pack)
  39                 argv[4] = "--thin";
  40         memset(&po, 0, sizeof(po));
  41         po.argv = argv;
  42         po.in = -1;
  43         po.out = fd;
  44         po.git_cmd = 1;
  45         if (start_command(&po))
  46                 die("git pack-objects failed (%s)", strerror(errno));
  47
  48         /*
  49          * We feed the pack-objects we just spawned with revision
  50          * parameters by writing to the pipe.
  51          */
  52         while (refs) {
  53                 char buf[42];
  54
  55                 if (!is_null_sha1(refs->old_sha1) &&
  56                     has_sha1_file(refs->old_sha1)) {
  57                         memcpy(buf + 1, sha1_to_hex(refs->old_sha1), 40);
  58                         buf[0] = '^';
  59                         buf[41] = '\n';
  60                         if (!write_or_whine(po.in, buf, 42,
  61                                                 "send-pack: send refs"))
  62                                 break;
  63                 }
  64                 if (!is_null_sha1(refs->new_sha1)) {
  65                         memcpy(buf, sha1_to_hex(refs->new_sha1), 40);
  66                         buf[40] = '\n';
  67                         if (!write_or_whine(po.in, buf, 41,
  68                                                 "send-pack: send refs"))
  69                                 break;
  70                 }
  71                 refs = refs->next;
  72         }
  73
  74         close(po.in);
  75         if (finish_command(&po))
  76                 return error("pack-objects died with strange error");
  77         return 0;
  78 }
  79
  80 static void unmark_and_free(struct commit_list *list, unsigned int mark)
  81 {
  82         while (list) {
  83                 struct commit_list *temp = list;
  84                 temp->item->object.flags &= ~mark;
  85                 list = temp->next;
  86                 free(temp);
  87         }
  88 }
  89
  90 static int ref_newer(const unsigned char *new_sha1,
  91                      const unsigned char *old_sha1)
  92 {
  93         struct object *o;
  94         struct commit *old, *new;
  95         struct commit_list *list, *used;
  96         int found = 0;
  97
  98         /* Both new and old must be commit-ish and new is descendant of
  99          * old.  Otherwise we require --force.
 100          */
 101         o = deref_tag(parse_object(old_sha1), NULL, 0);
 102         if (!o || o->type != OBJ_COMMIT)
 103                 return 0;
 104         old = (struct commit *) o;
 105
 106         o = deref_tag(parse_object(new_sha1), NULL, 0);
 107         if (!o || o->type != OBJ_COMMIT)
 108                 return 0;
 109         new = (struct commit *) o;
 110
 111         if (parse_commit(new) < 0)
 112                 return 0;
 113
 114         used = list = NULL;
 115         commit_list_insert(new, &list);
 116         while (list) {
 117                 new = pop_most_recent_commit(&list, 1);
 118                 commit_list_insert(new, &used);
 119                 if (new == old) {
 120                         found = 1;
 121                         break;
 122                 }
 123         }
 124         unmark_and_free(list, 1);
 125         unmark_and_free(used, 1);
 126         return found;
 127 }
 128
 129 static struct ref *local_refs, **local_tail;
 130 static struct ref *remote_refs, **remote_tail;
 131
 132 static int one_local_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
 133 {
 134         struct ref *ref;
 135         int len;
 136
 137         /* we already know it starts with refs/ to get here */
 138         if (check_ref_format(refname + 5))
 139                 return 0;
 140
 141         len = strlen(refname) + 1;
 142         ref = xcalloc(1, sizeof(*ref) + len);
 143         hashcpy(ref->new_sha1, sha1);
 144         memcpy(ref->name, refname, len);
 145         *local_tail = ref;
 146         local_tail = &ref->next;
 147         return 0;
 148 }
 149
 150 static void get_local_heads(void)
 151 {
 152         local_tail = &local_refs;
 153         for_each_ref(one_local_ref, NULL);
 154 }
 155
 156 static int receive_status(int in, struct ref *refs)
 157 {
 158         struct ref *hint;
 159         char line[1000];
 160         int ret = 0;
 161         int len = packet_read_line(in, line, sizeof(line));
 162         if (len < 10 || memcmp(line, "unpack ", 7))
 163                 return error("did not receive remote status");
 164         if (memcmp(line, "unpack ok\n", 10)) {
 165                 char *p = line + strlen(line) - 1;
 166                 if (*p == '\n')
 167                         *p = '\0';
 168                 error("unpack failed: %s", line + 7);
 169                 ret = -1;
 170         }
 171         hint = NULL;
 172         while (1) {
 173                 char *refname;
 174                 char *msg;
 175                 len = packet_read_line(in, line, sizeof(line));
 176                 if (!len)
 177                         break;
 178                 if (len < 3 ||
 179                     (memcmp(line, "ok ", 3) && memcmp(line, "ng ", 3))) {
 180                         fprintf(stderr, "protocol error: %s\n", line);
 181                         ret = -1;
 182                         break;
 183                 }
 184
 185                 line[strlen(line)-1] = '\0';
 186                 refname = line + 3;
 187                 msg = strchr(refname, ' ');
 188                 if (msg)
 189                         *msg++ = '\0';
 190
 191                 /* first try searching at our hint, falling back to all refs */
 192                 if (hint)
 193                         hint = find_ref_by_name(hint, refname);
 194                 if (!hint)
 195                         hint = find_ref_by_name(refs, refname);
 196                 if (!hint) {
 197                         warning("remote reported status on unknown ref: %s",
 198                                         refname);
 199                         continue;
 200                 }
 201                 if (hint->status != REF_STATUS_EXPECTING_REPORT) {
 202                         warning("remote reported status on unexpected ref: %s",
 203                                         refname);
 204                         continue;
 205                 }
 206
 207                 if (line[0] == 'o' && line[1] == 'k')
 208                         hint->status = REF_STATUS_OK;
 209                 else {
 210                         hint->status = REF_STATUS_REMOTE_REJECT;
 211                         ret = -1;
 212                 }
 213                 if (msg)
 214                         hint->remote_status = xstrdup(msg);
 215                 /* start our next search from the next ref */
 216                 hint = hint->next;
 217         }
 218         return ret;
 219 }
 220
 221 static void update_tracking_ref(struct remote *remote, struct ref *ref)
 222 {
 223         struct refspec rs;
 224
 225         if (ref->status != REF_STATUS_OK && ref->status != REF_STATUS_UPTODATE)
 226                 return;
 227
 228         rs.src = ref->name;
 229         rs.dst = NULL;
 230
 231         if (!remote_find_tracking(remote, &rs)) {
 232                 if (args.verbose)
 233                         fprintf(stderr, "updating local tracking ref '%s'\n", rs.dst);
 234                 if (ref->deletion) {
 235                         delete_ref(rs.dst, NULL, 0);
 236                 } else
 237                         update_ref("update by push", rs.dst,
 238                                         ref->new_sha1, NULL, 0, 0);
 239                 free(rs.dst);
 240         }
 241 }
 242
 243 static const char *prettify_ref(const struct ref *ref)
 244 {
 245         const char *name = ref->name;
 246         return name + (
 247                 !prefixcmp(name, "refs/heads/") ? 11 :
 248                 !prefixcmp(name, "refs/tags/") ? 10 :
 249                 !prefixcmp(name, "refs/remotes/") ? 13 :
 250                 0);
 251 }
 252
 253 #define SUMMARY_WIDTH (2 * DEFAULT_ABBREV + 3)
 254
 255 static void print_ref_status(char flag, const char *summary, struct ref *to, struct ref *from, const char *msg)
 256 {
 257         fprintf(stderr, " %c %-*s ", flag, SUMMARY_WIDTH, summary);
 258         if (from)
 259                 fprintf(stderr, "%s -> %s", prettify_ref(from), prettify_ref(to));
 260         else
 261                 fputs(prettify_ref(to), stderr);
 262         if (msg) {
 263                 fputs(" (", stderr);
 264                 fputs(msg, stderr);
 265                 fputc(')', stderr);
 266         }
 267         fputc('\n', stderr);
 268 }
 269
 270 static const char *status_abbrev(unsigned char sha1[20])
 271 {
 272         return find_unique_abbrev(sha1, DEFAULT_ABBREV);
 273 }
 274
 275 static void print_ok_ref_status(struct ref *ref)
 276 {
 277         if (ref->deletion)
 278                 print_ref_status('-', "[deleted]", ref, NULL, NULL);
 279         else if (is_null_sha1(ref->old_sha1))
 280                 print_ref_status('*',
 281                         (!prefixcmp(ref->name, "refs/tags/") ? "[new tag]" :
 282                           "[new branch]"),
 283                         ref, ref->peer_ref, NULL);
 284         else {
 285                 char quickref[84];
 286                 char type;
 287                 const char *msg;
 288
 289                 strcpy(quickref, status_abbrev(ref->old_sha1));
 290                 if (ref->nonfastforward) {
 291                         strcat(quickref, "...");
 292                         type = '+';
 293                         msg = "forced update";
 294                 } else {
 295                         strcat(quickref, "..");
 296                         type = ' ';
 297                         msg = NULL;
 298                 }
 299                 strcat(quickref, status_abbrev(ref->new_sha1));
 300
 301                 print_ref_status(type, quickref, ref, ref->peer_ref, msg);
 302         }
 303 }
 304
 305 static int print_one_push_status(struct ref *ref, const char *dest, int count)
 306 {
 307         if (!count)
 308                 fprintf(stderr, "To %s\n", dest);
 309
 310         switch(ref->status) {
 311         case REF_STATUS_NONE:
 312                 print_ref_status('X', "[no match]", ref, NULL, NULL);
 313                 break;
 314         case REF_STATUS_REJECT_NODELETE:
 315                 print_ref_status('!', "[rejected]", ref, NULL,
 316                                 "remote does not support deleting refs");
 317                 break;
 318         case REF_STATUS_UPTODATE:
 319                 print_ref_status('=', "[up to date]", ref,
 320                                 ref->peer_ref, NULL);
 321                 break;
 322         case REF_STATUS_REJECT_NONFASTFORWARD:
 323                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 324                                 "non-fast forward");
 325                 break;
 326         case REF_STATUS_REMOTE_REJECT:
 327                 print_ref_status('!', "[remote rejected]", ref,
 328                                 ref->deletion ? NULL : ref->peer_ref,
 329                                 ref->remote_status);
 330                 break;
 331         case REF_STATUS_EXPECTING_REPORT:
 332                 print_ref_status('!', "[remote failure]", ref,
 333                                 ref->deletion ? NULL : ref->peer_ref,
 334                                 "remote failed to report status");
 335                 break;
 336         case REF_STATUS_OK:
 337                 print_ok_ref_status(ref);
 338                 break;
 339         }
 340
 341         return 1;
 342 }
 343
 344 static void print_push_status(const char *dest, struct ref *refs)
 345 {
 346         struct ref *ref;
 347         int n = 0;
 348
 349         if (args.verbose) {
 350                 for (ref = refs; ref; ref = ref->next)
 351                         if (ref->status == REF_STATUS_UPTODATE)
 352                                 n += print_one_push_status(ref, dest, n);
 353         }
 354
 355         for (ref = refs; ref; ref = ref->next)
 356                 if (ref->status == REF_STATUS_OK)
 357                         n += print_one_push_status(ref, dest, n);
 358
 359         for (ref = refs; ref; ref = ref->next) {
 360                 if (ref->status != REF_STATUS_NONE &&
 361                     ref->status != REF_STATUS_UPTODATE &&
 362                     ref->status != REF_STATUS_OK)
 363                         n += print_one_push_status(ref, dest, n);
 364         }
 365 }
 366
 367 static int refs_pushed(struct ref *ref)
 368 {
 369         for (; ref; ref = ref->next) {
 370                 switch(ref->status) {
 371                 case REF_STATUS_NONE:
 372                 case REF_STATUS_UPTODATE:
 373                         break;
 374                 default:
 375                         return 1;
 376                 }
 377         }
 378         return 0;
 379 }
 380
 381 static int do_send_pack(int in, int out, struct remote *remote, const char *dest, int nr_refspec, const char **refspec)
 382 {
 383         struct ref *ref;
 384         int new_refs;
 385         int ask_for_status_report = 0;
 386         int allow_deleting_refs = 0;
 387         int expect_status_report = 0;
 388         int flags = MATCH_REFS_NONE;
 389         int ret;
 390
 391         if (args.send_all)
 392                 flags |= MATCH_REFS_ALL;
 393         if (args.send_mirror)
 394                 flags |= MATCH_REFS_MIRROR;
 395
 396         /* No funny business with the matcher */
 397         remote_tail = get_remote_heads(in, &remote_refs, 0, NULL, REF_NORMAL);
 398         get_local_heads();
 399
 400         /* Does the other end support the reporting? */
 401         if (server_supports("report-status"))
 402                 ask_for_status_report = 1;
 403         if (server_supports("delete-refs"))
 404                 allow_deleting_refs = 1;
 405
 406         /* match them up */
 407         if (!remote_tail)
 408                 remote_tail = &remote_refs;
 409         if (match_refs(local_refs, remote_refs, &remote_tail,
 410                        nr_refspec, refspec, flags)) {
 411                 close(out);
 412                 return -1;
 413         }
 414
 415         if (!remote_refs) {
 416                 fprintf(stderr, "No refs in common and none specified; doing nothing.\n"
 417                         "Perhaps you should specify a branch such as 'master'.\n");
 418                 close(out);
 419                 return 0;
 420         }
 421
 422         /*
 423          * Finally, tell the other end!
 424          */
 425         new_refs = 0;
 426         for (ref = remote_refs; ref; ref = ref->next) {
 427
 428                 if (ref->peer_ref)
 429                         hashcpy(ref->new_sha1, ref->peer_ref->new_sha1);
 430                 else if (!args.send_mirror)
 431                         continue;
 432
 433                 ref->deletion = is_null_sha1(ref->new_sha1);
 434                 if (ref->deletion && !allow_deleting_refs) {
 435                         ref->status = REF_STATUS_REJECT_NODELETE;
 436                         continue;
 437                 }
 438                 if (!ref->deletion &&
 439                     !hashcmp(ref->old_sha1, ref->new_sha1)) {
 440                         ref->status = REF_STATUS_UPTODATE;
 441                         continue;
 442                 }
 443
 444                 /* This part determines what can overwrite what.
 445                  * The rules are:
 446                  *
 447                  * (0) you can always use --force or +A:B notation to
 448                  *     selectively force individual ref pairs.
 449                  *
 450                  * (1) if the old thing does not exist, it is OK.
 451                  *
 452                  * (2) if you do not have the old thing, you are not allowed
 453                  *     to overwrite it; you would not know what you are losing
 454                  *     otherwise.
 455                  *
 456                  * (3) if both new and old are commit-ish, and new is a
 457                  *     descendant of old, it is OK.
 458                  *
 459                  * (4) regardless of all of the above, removing :B is
 460                  *     always allowed.
 461                  */
 462
 463                 ref->nonfastforward =
 464                     !ref->deletion &&
 465                     !is_null_sha1(ref->old_sha1) &&
 466                     (!has_sha1_file(ref->old_sha1)
 467                       || !ref_newer(ref->new_sha1, ref->old_sha1));
 468
 469                 if (ref->nonfastforward && !ref->force && !args.force_update) {
 470                         ref->status = REF_STATUS_REJECT_NONFASTFORWARD;
 471                         continue;
 472                 }
 473
 474                 if (!ref->deletion)
 475                         new_refs++;
 476
 477                 if (!args.dry_run) {
 478                         char *old_hex = sha1_to_hex(ref->old_sha1);
 479                         char *new_hex = sha1_to_hex(ref->new_sha1);
 480
 481                         if (ask_for_status_report) {
 482                                 packet_write(out, "%s %s %s%c%s",
 483                                         old_hex, new_hex, ref->name, 0,
 484                                         "report-status");
 485                                 ask_for_status_report = 0;
 486                                 expect_status_report = 1;
 487                         }
 488                         else
 489                                 packet_write(out, "%s %s %s",
 490                                         old_hex, new_hex, ref->name);
 491                 }
 492                 ref->status = expect_status_report ?
 493                         REF_STATUS_EXPECTING_REPORT :
 494                         REF_STATUS_OK;
 495         }
 496
 497         packet_flush(out);
 498         if (new_refs && !args.dry_run) {
 499                 if (pack_objects(out, remote_refs) < 0)
 500                         return -1;
 501         }
 502         else
 503                 close(out);
 504
 505         if (expect_status_report)
 506                 ret = receive_status(in, remote_refs);
 507         else
 508                 ret = 0;
 509
 510         print_push_status(dest, remote_refs);
 511
 512         if (!args.dry_run && remote) {
 513                 for (ref = remote_refs; ref; ref = ref->next)
 514                         update_tracking_ref(remote, ref);
 515         }
 516
 517         if (!refs_pushed(remote_refs))
 518                 fprintf(stderr, "Everything up-to-date\n");
 519         if (ret < 0)
 520                 return ret;
 521         for (ref = remote_refs; ref; ref = ref->next) {
 522                 switch (ref->status) {
 523                 case REF_STATUS_NONE:
 524                 case REF_STATUS_UPTODATE:
 525                 case REF_STATUS_OK:
 526                         break;
 527                 default:
 528                         return -1;
 529                 }
 530         }
 531         return 0;
 532 }
 533
 534 static void verify_remote_names(int nr_heads, const char **heads)
 535 {
 536         int i;
 537
 538         for (i = 0; i < nr_heads; i++) {
 539                 const char *local = heads[i];
 540                 const char *remote = strrchr(heads[i], ':');
 541
 542                 if (*local == '+')
 543                         local++;
 544
 545                 /* A matching refspec is okay.  */
 546                 if (remote == local && remote[1] == '\0')
 547                         continue;
 548
 549                 remote = remote ? (remote + 1) : local;
 550                 switch (check_ref_format(remote)) {
 551                 case 0: /* ok */
 552                 case CHECK_REF_FORMAT_ONELEVEL:
 553                         /* ok but a single level -- that is fine for
 554                          * a match pattern.
 555                          */
 556                 case CHECK_REF_FORMAT_WILDCARD:
 557                         /* ok but ends with a pattern-match character */
 558                         continue;
 559                 }
 560                 die("remote part of refspec is not a valid name in %s",
 561                     heads[i]);
 562         }
 563 }
 564
 565 int cmd_send_pack(int argc, const char **argv, const char *prefix)
 566 {
 567         int i, nr_heads = 0;
 568         const char **heads = NULL;
 569         const char *remote_name = NULL;
 570         struct remote *remote = NULL;
 571         const char *dest = NULL;
 572
 573         argv++;
 574         for (i = 1; i < argc; i++, argv++) {
 575                 const char *arg = *argv;
 576
 577                 if (*arg == '-') {
 578                         if (!prefixcmp(arg, "--receive-pack=")) {
 579                                 args.receivepack = arg + 15;
 580                                 continue;
 581                         }
 582                         if (!prefixcmp(arg, "--exec=")) {
 583                                 args.receivepack = arg + 7;
 584                                 continue;
 585                         }
 586                         if (!prefixcmp(arg, "--remote=")) {
 587                                 remote_name = arg + 9;
 588                                 continue;
 589                         }
 590                         if (!strcmp(arg, "--all")) {
 591                                 args.send_all = 1;
 592                                 continue;
 593                         }
 594                         if (!strcmp(arg, "--dry-run")) {
 595                                 args.dry_run = 1;
 596                                 continue;
 597                         }
 598                         if (!strcmp(arg, "--mirror")) {
 599                                 args.send_mirror = 1;
 600                                 continue;
 601                         }
 602                         if (!strcmp(arg, "--force")) {
 603                                 args.force_update = 1;
 604                                 continue;
 605                         }
 606                         if (!strcmp(arg, "--verbose")) {
 607                                 args.verbose = 1;
 608                                 continue;
 609                         }
 610                         if (!strcmp(arg, "--thin")) {
 611                                 args.use_thin_pack = 1;
 612                                 continue;
 613                         }
 614                         usage(send_pack_usage);
 615                 }
 616                 if (!dest) {
 617                         dest = arg;
 618                         continue;
 619                 }
 620                 heads = (const char **) argv;
 621                 nr_heads = argc - i;
 622                 break;
 623         }
 624         if (!dest)
 625                 usage(send_pack_usage);
 626         /*
 627          * --all and --mirror are incompatible; neither makes sense
 628          * with any refspecs.
 629          */
 630         if ((heads && (args.send_all || args.send_mirror)) ||
 631                                         (args.send_all && args.send_mirror))
 632                 usage(send_pack_usage);
 633
 634         if (remote_name) {
 635                 remote = remote_get(remote_name);
 636                 if (!remote_has_url(remote, dest)) {
 637                         die("Destination %s is not a uri for %s",
 638                             dest, remote_name);
 639                 }
 640         }
 641
 642         return send_pack(&args, dest, remote, nr_heads, heads);
 643 }
 644
 645 int send_pack(struct send_pack_args *my_args,
 646               const char *dest, struct remote *remote,
 647               int nr_heads, const char **heads)
 648 {
 649         int fd[2], ret;
 650         struct child_process *conn;
 651
 652         memcpy(&args, my_args, sizeof(args));
 653
 654         verify_remote_names(nr_heads, heads);
 655
 656         conn = git_connect(fd, dest, args.receivepack, args.verbose ? CONNECT_VERBOSE : 0);
 657         ret = do_send_pack(fd[0], fd[1], remote, dest, nr_heads, heads);
 658         close(fd[0]);
 659         /* do_send_pack always closes fd[1] */
 660         ret |= finish_connect(conn);
 661         return !!ret;
 662 }