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                         delete_ref(rs.dst, NULL);
 230                 } else
 231                         update_ref("update by push", rs.dst,
 232                                         ref->new_sha1, NULL, 0, 0);
 233                 free(rs.dst);
 234         }
 235 }
 236
 237 static const char *prettify_ref(const struct ref *ref)
 238 {
 239         const char *name = ref->name;
 240         return name + (
 241                 !prefixcmp(name, "refs/heads/") ? 11 :
 242                 !prefixcmp(name, "refs/tags/") ? 10 :
 243                 !prefixcmp(name, "refs/remotes/") ? 13 :
 244                 0);
 245 }
 246
 247 #define SUMMARY_WIDTH (2 * DEFAULT_ABBREV + 3)
 248
 249 static void print_ref_status(char flag, const char *summary, struct ref *to, struct ref *from, const char *msg)
 250 {
 251         fprintf(stderr, " %c %-*s ", flag, SUMMARY_WIDTH, summary);
 252         if (from)
 253                 fprintf(stderr, "%s -> %s", prettify_ref(from), prettify_ref(to));
 254         else
 255                 fputs(prettify_ref(to), stderr);
 256         if (msg) {
 257                 fputs(" (", stderr);
 258                 fputs(msg, stderr);
 259                 fputc(')', stderr);
 260         }
 261         fputc('\n', stderr);
 262 }
 263
 264 static const char *status_abbrev(unsigned char sha1[20])
 265 {
 266         return find_unique_abbrev(sha1, DEFAULT_ABBREV);
 267 }
 268
 269 static void print_ok_ref_status(struct ref *ref)
 270 {
 271         if (ref->deletion)
 272                 print_ref_status('-', "[deleted]", ref, NULL, NULL);
 273         else if (is_null_sha1(ref->old_sha1))
 274                 print_ref_status('*',
 275                         (!prefixcmp(ref->name, "refs/tags/") ? "[new tag]" :
 276                           "[new branch]"),
 277                         ref, ref->peer_ref, NULL);
 278         else {
 279                 char quickref[84];
 280                 char type;
 281                 const char *msg;
 282
 283                 strcpy(quickref, status_abbrev(ref->old_sha1));
 284                 if (ref->nonfastforward) {
 285                         strcat(quickref, "...");
 286                         type = '+';
 287                         msg = "forced update";
 288                 } else {
 289                         strcat(quickref, "..");
 290                         type = ' ';
 291                         msg = NULL;
 292                 }
 293                 strcat(quickref, status_abbrev(ref->new_sha1));
 294
 295                 print_ref_status(type, quickref, ref, ref->peer_ref, msg);
 296         }
 297 }
 298
 299 static int print_one_push_status(struct ref *ref, const char *dest, int count)
 300 {
 301         if (!count)
 302                 fprintf(stderr, "To %s\n", dest);
 303
 304         switch(ref->status) {
 305         case REF_STATUS_NONE:
 306                 print_ref_status('X', "[no match]", ref, NULL, NULL);
 307                 break;
 308         case REF_STATUS_REJECT_NODELETE:
 309                 print_ref_status('!', "[rejected]", ref, NULL,
 310                                 "remote does not support deleting refs");
 311                 break;
 312         case REF_STATUS_UPTODATE:
 313                 print_ref_status('=', "[up to date]", ref,
 314                                 ref->peer_ref, NULL);
 315                 break;
 316         case REF_STATUS_REJECT_NONFASTFORWARD:
 317                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 318                                 "non-fast forward");
 319                 break;
 320         case REF_STATUS_REMOTE_REJECT:
 321                 print_ref_status('!', "[remote rejected]", ref,
 322                                 ref->deletion ? NULL : ref->peer_ref,
 323                                 ref->remote_status);
 324                 break;
 325         case REF_STATUS_EXPECTING_REPORT:
 326                 print_ref_status('!', "[remote failure]", ref,
 327                                 ref->deletion ? NULL : ref->peer_ref,
 328                                 "remote failed to report status");
 329                 break;
 330         case REF_STATUS_OK:
 331                 print_ok_ref_status(ref);
 332                 break;
 333         }
 334
 335         return 1;
 336 }
 337
 338 static void print_push_status(const char *dest, struct ref *refs)
 339 {
 340         struct ref *ref;
 341         int n = 0;
 342
 343         if (args.verbose) {
 344                 for (ref = refs; ref; ref = ref->next)
 345                         if (ref->status == REF_STATUS_UPTODATE)
 346                                 n += print_one_push_status(ref, dest, n);
 347         }
 348
 349         for (ref = refs; ref; ref = ref->next)
 350                 if (ref->status == REF_STATUS_OK)
 351                         n += print_one_push_status(ref, dest, n);
 352
 353         for (ref = refs; ref; ref = ref->next) {
 354                 if (ref->status != REF_STATUS_NONE &&
 355                     ref->status != REF_STATUS_UPTODATE &&
 356                     ref->status != REF_STATUS_OK)
 357                         n += print_one_push_status(ref, dest, n);
 358         }
 359 }
 360
 361 static int refs_pushed(struct ref *ref)
 362 {
 363         for (; ref; ref = ref->next) {
 364                 switch(ref->status) {
 365                 case REF_STATUS_NONE:
 366                 case REF_STATUS_UPTODATE:
 367                         break;
 368                 default:
 369                         return 1;
 370                 }
 371         }
 372         return 0;
 373 }
 374
 375 static int do_send_pack(int in, int out, struct remote *remote, const char *dest, int nr_refspec, const char **refspec)
 376 {
 377         struct ref *ref;
 378         int new_refs;
 379         int ask_for_status_report = 0;
 380         int allow_deleting_refs = 0;
 381         int expect_status_report = 0;
 382         int flags = MATCH_REFS_NONE;
 383         int ret;
 384
 385         if (args.send_all)
 386                 flags |= MATCH_REFS_ALL;
 387         if (args.send_mirror)
 388                 flags |= MATCH_REFS_MIRROR;
 389
 390         /* No funny business with the matcher */
 391         remote_tail = get_remote_heads(in, &remote_refs, 0, NULL, REF_NORMAL);
 392         get_local_heads();
 393
 394         /* Does the other end support the reporting? */
 395         if (server_supports("report-status"))
 396                 ask_for_status_report = 1;
 397         if (server_supports("delete-refs"))
 398                 allow_deleting_refs = 1;
 399
 400         /* match them up */
 401         if (!remote_tail)
 402                 remote_tail = &remote_refs;
 403         if (match_refs(local_refs, remote_refs, &remote_tail,
 404                        nr_refspec, refspec, flags)) {
 405                 close(out);
 406                 return -1;
 407         }
 408
 409         if (!remote_refs) {
 410                 fprintf(stderr, "No refs in common and none specified; doing nothing.\n"
 411                         "Perhaps you should specify a branch such as 'master'.\n");
 412                 close(out);
 413                 return 0;
 414         }
 415
 416         /*
 417          * Finally, tell the other end!
 418          */
 419         new_refs = 0;
 420         for (ref = remote_refs; ref; ref = ref->next) {
 421                 const unsigned char *new_sha1;
 422
 423                 if (!ref->peer_ref) {
 424                         if (!args.send_mirror)
 425                                 continue;
 426                         new_sha1 = null_sha1;
 427                 }
 428                 else
 429                         new_sha1 = ref->peer_ref->new_sha1;
 430
 431
 432                 ref->deletion = is_null_sha1(new_sha1);
 433                 if (ref->deletion && !allow_deleting_refs) {
 434                         ref->status = REF_STATUS_REJECT_NODELETE;
 435                         continue;
 436                 }
 437                 if (!ref->deletion &&
 438                     !hashcmp(ref->old_sha1, new_sha1)) {
 439                         ref->status = REF_STATUS_UPTODATE;
 440                         continue;
 441                 }
 442
 443                 /* This part determines what can overwrite what.
 444                  * The rules are:
 445                  *
 446                  * (0) you can always use --force or +A:B notation to
 447                  *     selectively force individual ref pairs.
 448                  *
 449                  * (1) if the old thing does not exist, it is OK.
 450                  *
 451                  * (2) if you do not have the old thing, you are not allowed
 452                  *     to overwrite it; you would not know what you are losing
 453                  *     otherwise.
 454                  *
 455                  * (3) if both new and old are commit-ish, and new is a
 456                  *     descendant of old, it is OK.
 457                  *
 458                  * (4) regardless of all of the above, removing :B is
 459                  *     always allowed.
 460                  */
 461
 462                 ref->nonfastforward =
 463                     !ref->deletion &&
 464                     !is_null_sha1(ref->old_sha1) &&
 465                     (!has_sha1_file(ref->old_sha1)
 466                       || !ref_newer(new_sha1, ref->old_sha1));
 467
 468                 if (ref->nonfastforward && !ref->force && !args.force_update) {
 469                         ref->status = REF_STATUS_REJECT_NONFASTFORWARD;
 470                         continue;
 471                 }
 472
 473                 hashcpy(ref->new_sha1, new_sha1);
 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 }