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 = strlen(refname) + 1;
 136         ref = xcalloc(1, sizeof(*ref) + len);
 137         hashcpy(ref->new_sha1, sha1);
 138         memcpy(ref->name, refname, len);
 139         *local_tail = ref;
 140         local_tail = &ref->next;
 141         return 0;
 142 }
 143
 144 static void get_local_heads(void)
 145 {
 146         local_tail = &local_refs;
 147         for_each_ref(one_local_ref, NULL);
 148 }
 149
 150 static int receive_status(int in, struct ref *refs)
 151 {
 152         struct ref *hint;
 153         char line[1000];
 154         int ret = 0;
 155         int len = packet_read_line(in, line, sizeof(line));
 156         if (len < 10 || memcmp(line, "unpack ", 7))
 157                 return error("did not receive remote status");
 158         if (memcmp(line, "unpack ok\n", 10)) {
 159                 char *p = line + strlen(line) - 1;
 160                 if (*p == '\n')
 161                         *p = '\0';
 162                 error("unpack failed: %s", line + 7);
 163                 ret = -1;
 164         }
 165         hint = NULL;
 166         while (1) {
 167                 char *refname;
 168                 char *msg;
 169                 len = packet_read_line(in, line, sizeof(line));
 170                 if (!len)
 171                         break;
 172                 if (len < 3 ||
 173                     (memcmp(line, "ok ", 3) && memcmp(line, "ng ", 3))) {
 174                         fprintf(stderr, "protocol error: %s\n", line);
 175                         ret = -1;
 176                         break;
 177                 }
 178
 179                 line[strlen(line)-1] = '\0';
 180                 refname = line + 3;
 181                 msg = strchr(refname, ' ');
 182                 if (msg)
 183                         *msg++ = '\0';
 184
 185                 /* first try searching at our hint, falling back to all refs */
 186                 if (hint)
 187                         hint = find_ref_by_name(hint, refname);
 188                 if (!hint)
 189                         hint = find_ref_by_name(refs, refname);
 190                 if (!hint) {
 191                         warning("remote reported status on unknown ref: %s",
 192                                         refname);
 193                         continue;
 194                 }
 195                 if (hint->status != REF_STATUS_EXPECTING_REPORT) {
 196                         warning("remote reported status on unexpected ref: %s",
 197                                         refname);
 198                         continue;
 199                 }
 200
 201                 if (line[0] == 'o' && line[1] == 'k')
 202                         hint->status = REF_STATUS_OK;
 203                 else {
 204                         hint->status = REF_STATUS_REMOTE_REJECT;
 205                         ret = -1;
 206                 }
 207                 if (msg)
 208                         hint->remote_status = xstrdup(msg);
 209                 /* start our next search from the next ref */
 210                 hint = hint->next;
 211         }
 212         return ret;
 213 }
 214
 215 static void update_tracking_ref(struct remote *remote, struct ref *ref)
 216 {
 217         struct refspec rs;
 218
 219         if (ref->status != REF_STATUS_OK)
 220                 return;
 221
 222         rs.src = ref->name;
 223         rs.dst = NULL;
 224
 225         if (!remote_find_tracking(remote, &rs)) {
 226                 if (args.verbose)
 227                         fprintf(stderr, "updating local tracking ref '%s'\n", rs.dst);
 228                 if (ref->deletion) {
 229                         if (delete_ref(rs.dst, NULL))
 230                                 error("Failed to delete");
 231                 } else
 232                         update_ref("update by push", rs.dst,
 233                                         ref->new_sha1, NULL, 0, 0);
 234                 free(rs.dst);
 235         }
 236 }
 237
 238 static const char *prettify_ref(const struct ref *ref)
 239 {
 240         const char *name = ref->name;
 241         return name + (
 242                 !prefixcmp(name, "refs/heads/") ? 11 :
 243                 !prefixcmp(name, "refs/tags/") ? 10 :
 244                 !prefixcmp(name, "refs/remotes/") ? 13 :
 245                 0);
 246 }
 247
 248 #define SUMMARY_WIDTH (2 * DEFAULT_ABBREV + 3)
 249
 250 static void print_ref_status(char flag, const char *summary, struct ref *to, struct ref *from, const char *msg)
 251 {
 252         fprintf(stderr, " %c %-*s ", flag, SUMMARY_WIDTH, summary);
 253         if (from)
 254                 fprintf(stderr, "%s -> %s", prettify_ref(from), prettify_ref(to));
 255         else
 256                 fputs(prettify_ref(to), stderr);
 257         if (msg) {
 258                 fputs(" (", stderr);
 259                 fputs(msg, stderr);
 260                 fputc(')', stderr);
 261         }
 262         fputc('\n', stderr);
 263 }
 264
 265 static const char *status_abbrev(unsigned char sha1[20])
 266 {
 267         const char *abbrev;
 268         abbrev = find_unique_abbrev(sha1, DEFAULT_ABBREV);
 269         return abbrev ? abbrev : sha1_to_hex(sha1);
 270 }
 271
 272 static void print_ok_ref_status(struct ref *ref)
 273 {
 274         if (ref->deletion)
 275                 print_ref_status('-', "[deleted]", ref, NULL, NULL);
 276         else if (is_null_sha1(ref->old_sha1))
 277                 print_ref_status('*',
 278                         (!prefixcmp(ref->name, "refs/tags/") ? "[new tag]" :
 279                           "[new branch]"),
 280                         ref, ref->peer_ref, NULL);
 281         else {
 282                 char quickref[84];
 283                 char type;
 284                 const char *msg;
 285
 286                 strcpy(quickref, status_abbrev(ref->old_sha1));
 287                 if (ref->nonfastforward) {
 288                         strcat(quickref, "...");
 289                         type = '+';
 290                         msg = "forced update";
 291                 } else {
 292                         strcat(quickref, "..");
 293                         type = ' ';
 294                         msg = NULL;
 295                 }
 296                 strcat(quickref, status_abbrev(ref->new_sha1));
 297
 298                 print_ref_status(type, quickref, ref, ref->peer_ref, msg);
 299         }
 300 }
 301
 302 static int print_one_push_status(struct ref *ref, const char *dest, int count)
 303 {
 304         if (!count)
 305                 fprintf(stderr, "To %s\n", dest);
 306
 307         switch(ref->status) {
 308         case REF_STATUS_NONE:
 309                 print_ref_status('X', "[no match]", ref, NULL, NULL);
 310                 break;
 311         case REF_STATUS_REJECT_NODELETE:
 312                 print_ref_status('!', "[rejected]", ref, NULL,
 313                                 "remote does not support deleting refs");
 314                 break;
 315         case REF_STATUS_UPTODATE:
 316                 print_ref_status('=', "[up to date]", ref,
 317                                 ref->peer_ref, NULL);
 318                 break;
 319         case REF_STATUS_REJECT_NONFASTFORWARD:
 320                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 321                                 "non-fast forward");
 322                 break;
 323         case REF_STATUS_REMOTE_REJECT:
 324                 print_ref_status('!', "[remote rejected]", ref,
 325                                 ref->deletion ? NULL : ref->peer_ref,
 326                                 ref->remote_status);
 327                 break;
 328         case REF_STATUS_EXPECTING_REPORT:
 329                 print_ref_status('!', "[remote failure]", ref,
 330                                 ref->deletion ? NULL : ref->peer_ref,
 331                                 "remote failed to report status");
 332                 break;
 333         case REF_STATUS_OK:
 334                 print_ok_ref_status(ref);
 335                 break;
 336         }
 337
 338         return 1;
 339 }
 340
 341 static void print_push_status(const char *dest, struct ref *refs)
 342 {
 343         struct ref *ref;
 344         int n = 0;
 345
 346         if (args.verbose) {
 347                 for (ref = refs; ref; ref = ref->next)
 348                         if (ref->status == REF_STATUS_UPTODATE)
 349                                 n += print_one_push_status(ref, dest, n);
 350         }
 351
 352         for (ref = refs; ref; ref = ref->next)
 353                 if (ref->status == REF_STATUS_OK)
 354                         n += print_one_push_status(ref, dest, n);
 355
 356         for (ref = refs; ref; ref = ref->next) {
 357                 if (ref->status != REF_STATUS_NONE &&
 358                     ref->status != REF_STATUS_UPTODATE &&
 359                     ref->status != REF_STATUS_OK)
 360                         n += print_one_push_status(ref, dest, n);
 361         }
 362 }
 363
 364 static int refs_pushed(struct ref *ref)
 365 {
 366         for (; ref; ref = ref->next) {
 367                 switch(ref->status) {
 368                 case REF_STATUS_NONE:
 369                 case REF_STATUS_UPTODATE:
 370                         break;
 371                 default:
 372                         return 1;
 373                 }
 374         }
 375         return 0;
 376 }
 377
 378 static int do_send_pack(int in, int out, struct remote *remote, const char *dest, int nr_refspec, const char **refspec)
 379 {
 380         struct ref *ref;
 381         int new_refs;
 382         int ask_for_status_report = 0;
 383         int allow_deleting_refs = 0;
 384         int expect_status_report = 0;
 385         int flags = MATCH_REFS_NONE;
 386         int ret;
 387
 388         if (args.send_all)
 389                 flags |= MATCH_REFS_ALL;
 390         if (args.send_mirror)
 391                 flags |= MATCH_REFS_MIRROR;
 392
 393         /* No funny business with the matcher */
 394         remote_tail = get_remote_heads(in, &remote_refs, 0, NULL, REF_NORMAL);
 395         get_local_heads();
 396
 397         /* Does the other end support the reporting? */
 398         if (server_supports("report-status"))
 399                 ask_for_status_report = 1;
 400         if (server_supports("delete-refs"))
 401                 allow_deleting_refs = 1;
 402
 403         /* match them up */
 404         if (!remote_tail)
 405                 remote_tail = &remote_refs;
 406         if (match_refs(local_refs, remote_refs, &remote_tail,
 407                        nr_refspec, refspec, flags)) {
 408                 close(out);
 409                 return -1;
 410         }
 411
 412         if (!remote_refs) {
 413                 fprintf(stderr, "No refs in common and none specified; doing nothing.\n"
 414                         "Perhaps you should specify a branch such as 'master'.\n");
 415                 close(out);
 416                 return 0;
 417         }
 418
 419         /*
 420          * Finally, tell the other end!
 421          */
 422         new_refs = 0;
 423         for (ref = remote_refs; ref; ref = ref->next) {
 424                 const unsigned char *new_sha1;
 425
 426                 if (!ref->peer_ref) {
 427                         if (!args.send_mirror)
 428                                 continue;
 429                         new_sha1 = null_sha1;
 430                 }
 431                 else
 432                         new_sha1 = ref->peer_ref->new_sha1;
 433
 434
 435                 ref->deletion = is_null_sha1(new_sha1);
 436                 if (ref->deletion && !allow_deleting_refs) {
 437                         ref->status = REF_STATUS_REJECT_NODELETE;
 438                         continue;
 439                 }
 440                 if (!ref->deletion &&
 441                     !hashcmp(ref->old_sha1, new_sha1)) {
 442                         ref->status = REF_STATUS_UPTODATE;
 443                         continue;
 444                 }
 445
 446                 /* This part determines what can overwrite what.
 447                  * The rules are:
 448                  *
 449                  * (0) you can always use --force or +A:B notation to
 450                  *     selectively force individual ref pairs.
 451                  *
 452                  * (1) if the old thing does not exist, it is OK.
 453                  *
 454                  * (2) if you do not have the old thing, you are not allowed
 455                  *     to overwrite it; you would not know what you are losing
 456                  *     otherwise.
 457                  *
 458                  * (3) if both new and old are commit-ish, and new is a
 459                  *     descendant of old, it is OK.
 460                  *
 461                  * (4) regardless of all of the above, removing :B is
 462                  *     always allowed.
 463                  */
 464
 465                 ref->nonfastforward =
 466                     !ref->deletion &&
 467                     !is_null_sha1(ref->old_sha1) &&
 468                     (!has_sha1_file(ref->old_sha1)
 469                       || !ref_newer(new_sha1, ref->old_sha1));
 470
 471                 if (ref->nonfastforward && !ref->force && !args.force_update) {
 472                         ref->status = REF_STATUS_REJECT_NONFASTFORWARD;
 473                         continue;
 474                 }
 475
 476                 hashcpy(ref->new_sha1, new_sha1);
 477                 if (!ref->deletion)
 478                         new_refs++;
 479
 480                 if (!args.dry_run) {
 481                         char *old_hex = sha1_to_hex(ref->old_sha1);
 482                         char *new_hex = sha1_to_hex(ref->new_sha1);
 483
 484                         if (ask_for_status_report) {
 485                                 packet_write(out, "%s %s %s%c%s",
 486                                         old_hex, new_hex, ref->name, 0,
 487                                         "report-status");
 488                                 ask_for_status_report = 0;
 489                                 expect_status_report = 1;
 490                         }
 491                         else
 492                                 packet_write(out, "%s %s %s",
 493                                         old_hex, new_hex, ref->name);
 494                 }
 495                 ref->status = expect_status_report ?
 496                         REF_STATUS_EXPECTING_REPORT :
 497                         REF_STATUS_OK;
 498         }
 499
 500         packet_flush(out);
 501         if (new_refs && !args.dry_run) {
 502                 if (pack_objects(out, remote_refs) < 0)
 503                         return -1;
 504         }
 505         else
 506                 close(out);
 507
 508         if (expect_status_report)
 509                 ret = receive_status(in, remote_refs);
 510         else
 511                 ret = 0;
 512
 513         print_push_status(dest, remote_refs);
 514
 515         if (!args.dry_run && remote) {
 516                 for (ref = remote_refs; ref; ref = ref->next)
 517                         update_tracking_ref(remote, ref);
 518         }
 519
 520         if (!refs_pushed(remote_refs))
 521                 fprintf(stderr, "Everything up-to-date\n");
 522         if (ret < 0)
 523                 return ret;
 524         for (ref = remote_refs; ref; ref = ref->next) {
 525                 switch (ref->status) {
 526                 case REF_STATUS_NONE:
 527                 case REF_STATUS_UPTODATE:
 528                 case REF_STATUS_OK:
 529                         break;
 530                 default:
 531                         return -1;
 532                 }
 533         }
 534         return 0;
 535 }
 536
 537 static void verify_remote_names(int nr_heads, const char **heads)
 538 {
 539         int i;
 540
 541         for (i = 0; i < nr_heads; i++) {
 542                 const char *remote = strchr(heads[i], ':');
 543
 544                 remote = remote ? (remote + 1) : heads[i];
 545                 switch (check_ref_format(remote)) {
 546                 case 0: /* ok */
 547                 case CHECK_REF_FORMAT_ONELEVEL:
 548                         /* ok but a single level -- that is fine for
 549                          * a match pattern.
 550                          */
 551                 case CHECK_REF_FORMAT_WILDCARD:
 552                         /* ok but ends with a pattern-match character */
 553                         continue;
 554                 }
 555                 die("remote part of refspec is not a valid name in %s",
 556                     heads[i]);
 557         }
 558 }
 559
 560 int cmd_send_pack(int argc, const char **argv, const char *prefix)
 561 {
 562         int i, nr_heads = 0;
 563         const char **heads = NULL;
 564         const char *remote_name = NULL;
 565         struct remote *remote = NULL;
 566         const char *dest = NULL;
 567
 568         argv++;
 569         for (i = 1; i < argc; i++, argv++) {
 570                 const char *arg = *argv;
 571
 572                 if (*arg == '-') {
 573                         if (!prefixcmp(arg, "--receive-pack=")) {
 574                                 args.receivepack = arg + 15;
 575                                 continue;
 576                         }
 577                         if (!prefixcmp(arg, "--exec=")) {
 578                                 args.receivepack = arg + 7;
 579                                 continue;
 580                         }
 581                         if (!prefixcmp(arg, "--remote=")) {
 582                                 remote_name = arg + 9;
 583                                 continue;
 584                         }
 585                         if (!strcmp(arg, "--all")) {
 586                                 args.send_all = 1;
 587                                 continue;
 588                         }
 589                         if (!strcmp(arg, "--dry-run")) {
 590                                 args.dry_run = 1;
 591                                 continue;
 592                         }
 593                         if (!strcmp(arg, "--mirror")) {
 594                                 args.send_mirror = 1;
 595                                 continue;
 596                         }
 597                         if (!strcmp(arg, "--force")) {
 598                                 args.force_update = 1;
 599                                 continue;
 600                         }
 601                         if (!strcmp(arg, "--verbose")) {
 602                                 args.verbose = 1;
 603                                 continue;
 604                         }
 605                         if (!strcmp(arg, "--thin")) {
 606                                 args.use_thin_pack = 1;
 607                                 continue;
 608                         }
 609                         usage(send_pack_usage);
 610                 }
 611                 if (!dest) {
 612                         dest = arg;
 613                         continue;
 614                 }
 615                 heads = (const char **) argv;
 616                 nr_heads = argc - i;
 617                 break;
 618         }
 619         if (!dest)
 620                 usage(send_pack_usage);
 621         /*
 622          * --all and --mirror are incompatible; neither makes sense
 623          * with any refspecs.
 624          */
 625         if ((heads && (args.send_all || args.send_mirror)) ||
 626                                         (args.send_all && args.send_mirror))
 627                 usage(send_pack_usage);
 628
 629         if (remote_name) {
 630                 remote = remote_get(remote_name);
 631                 if (!remote_has_url(remote, dest)) {
 632                         die("Destination %s is not a uri for %s",
 633                             dest, remote_name);
 634                 }
 635         }
 636
 637         return send_pack(&args, dest, remote, nr_heads, heads);
 638 }
 639
 640 int send_pack(struct send_pack_args *my_args,
 641               const char *dest, struct remote *remote,
 642               int nr_heads, const char **heads)
 643 {
 644         int fd[2], ret;
 645         struct child_process *conn;
 646
 647         memcpy(&args, my_args, sizeof(args));
 648
 649         verify_remote_names(nr_heads, heads);
 650
 651         conn = git_connect(fd, dest, args.receivepack, args.verbose ? CONNECT_VERBOSE : 0);
 652         ret = do_send_pack(fd[0], fd[1], remote, dest, nr_heads, heads);
 653         close(fd[0]);
 654         /* do_send_pack always closes fd[1] */
 655         ret |= finish_connect(conn);
 656         return !!ret;
 657 }