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