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, struct extra_have_objects *extra)
  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         int i;
  38         char buf[42];
  39
  40         if (args.use_thin_pack)
  41                 argv[4] = "--thin";
  42         memset(&po, 0, sizeof(po));
  43         po.argv = argv;
  44         po.in = -1;
  45         po.out = fd;
  46         po.git_cmd = 1;
  47         if (start_command(&po))
  48                 die("git pack-objects failed (%s)", strerror(errno));
  49
  50         /*
  51          * We feed the pack-objects we just spawned with revision
  52          * parameters by writing to the pipe.
  53          */
  54         for (i = 0; i < extra->nr; i++) {
  55                 memcpy(buf + 1, sha1_to_hex(&extra->array[i][0]), 40);
  56                 buf[0] = '^';
  57                 buf[41] = '\n';
  58                 if (!write_or_whine(po.in, buf, 42, "send-pack: send refs"))
  59                         break;
  60         }
  61
  62         while (refs) {
  63                 if (!is_null_sha1(refs->old_sha1) &&
  64                     has_sha1_file(refs->old_sha1)) {
  65                         memcpy(buf + 1, sha1_to_hex(refs->old_sha1), 40);
  66                         buf[0] = '^';
  67                         buf[41] = '\n';
  68                         if (!write_or_whine(po.in, buf, 42,
  69                                                 "send-pack: send refs"))
  70                                 break;
  71                 }
  72                 if (!is_null_sha1(refs->new_sha1)) {
  73                         memcpy(buf, sha1_to_hex(refs->new_sha1), 40);
  74                         buf[40] = '\n';
  75                         if (!write_or_whine(po.in, buf, 41,
  76                                                 "send-pack: send refs"))
  77                                 break;
  78                 }
  79                 refs = refs->next;
  80         }
  81
  82         close(po.in);
  83         if (finish_command(&po))
  84                 return error("pack-objects died with strange error");
  85         return 0;
  86 }
  87
  88 static void unmark_and_free(struct commit_list *list, unsigned int mark)
  89 {
  90         while (list) {
  91                 struct commit_list *temp = list;
  92                 temp->item->object.flags &= ~mark;
  93                 list = temp->next;
  94                 free(temp);
  95         }
  96 }
  97
  98 static int ref_newer(const unsigned char *new_sha1,
  99                      const unsigned char *old_sha1)
 100 {
 101         struct object *o;
 102         struct commit *old, *new;
 103         struct commit_list *list, *used;
 104         int found = 0;
 105
 106         /* Both new and old must be commit-ish and new is descendant of
 107          * old.  Otherwise we require --force.
 108          */
 109         o = deref_tag(parse_object(old_sha1), NULL, 0);
 110         if (!o || o->type != OBJ_COMMIT)
 111                 return 0;
 112         old = (struct commit *) o;
 113
 114         o = deref_tag(parse_object(new_sha1), NULL, 0);
 115         if (!o || o->type != OBJ_COMMIT)
 116                 return 0;
 117         new = (struct commit *) o;
 118
 119         if (parse_commit(new) < 0)
 120                 return 0;
 121
 122         used = list = NULL;
 123         commit_list_insert(new, &list);
 124         while (list) {
 125                 new = pop_most_recent_commit(&list, 1);
 126                 commit_list_insert(new, &used);
 127                 if (new == old) {
 128                         found = 1;
 129                         break;
 130                 }
 131         }
 132         unmark_and_free(list, 1);
 133         unmark_and_free(used, 1);
 134         return found;
 135 }
 136
 137 static struct ref *local_refs, **local_tail;
 138 static struct ref *remote_refs, **remote_tail;
 139
 140 static int one_local_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
 141 {
 142         struct ref *ref;
 143         int len;
 144
 145         /* we already know it starts with refs/ to get here */
 146         if (check_ref_format(refname + 5))
 147                 return 0;
 148
 149         len = strlen(refname) + 1;
 150         ref = xcalloc(1, sizeof(*ref) + len);
 151         hashcpy(ref->new_sha1, sha1);
 152         memcpy(ref->name, refname, len);
 153         *local_tail = ref;
 154         local_tail = &ref->next;
 155         return 0;
 156 }
 157
 158 static void get_local_heads(void)
 159 {
 160         local_tail = &local_refs;
 161         for_each_ref(one_local_ref, NULL);
 162 }
 163
 164 static int receive_status(int in, struct ref *refs)
 165 {
 166         struct ref *hint;
 167         char line[1000];
 168         int ret = 0;
 169         int len = packet_read_line(in, line, sizeof(line));
 170         if (len < 10 || memcmp(line, "unpack ", 7))
 171                 return error("did not receive remote status");
 172         if (memcmp(line, "unpack ok\n", 10)) {
 173                 char *p = line + strlen(line) - 1;
 174                 if (*p == '\n')
 175                         *p = '\0';
 176                 error("unpack failed: %s", line + 7);
 177                 ret = -1;
 178         }
 179         hint = NULL;
 180         while (1) {
 181                 char *refname;
 182                 char *msg;
 183                 len = packet_read_line(in, line, sizeof(line));
 184                 if (!len)
 185                         break;
 186                 if (len < 3 ||
 187                     (memcmp(line, "ok ", 3) && memcmp(line, "ng ", 3))) {
 188                         fprintf(stderr, "protocol error: %s\n", line);
 189                         ret = -1;
 190                         break;
 191                 }
 192
 193                 line[strlen(line)-1] = '\0';
 194                 refname = line + 3;
 195                 msg = strchr(refname, ' ');
 196                 if (msg)
 197                         *msg++ = '\0';
 198
 199                 /* first try searching at our hint, falling back to all refs */
 200                 if (hint)
 201                         hint = find_ref_by_name(hint, refname);
 202                 if (!hint)
 203                         hint = find_ref_by_name(refs, refname);
 204                 if (!hint) {
 205                         warning("remote reported status on unknown ref: %s",
 206                                         refname);
 207                         continue;
 208                 }
 209                 if (hint->status != REF_STATUS_EXPECTING_REPORT) {
 210                         warning("remote reported status on unexpected ref: %s",
 211                                         refname);
 212                         continue;
 213                 }
 214
 215                 if (line[0] == 'o' && line[1] == 'k')
 216                         hint->status = REF_STATUS_OK;
 217                 else {
 218                         hint->status = REF_STATUS_REMOTE_REJECT;
 219                         ret = -1;
 220                 }
 221                 if (msg)
 222                         hint->remote_status = xstrdup(msg);
 223                 /* start our next search from the next ref */
 224                 hint = hint->next;
 225         }
 226         return ret;
 227 }
 228
 229 static void update_tracking_ref(struct remote *remote, struct ref *ref)
 230 {
 231         struct refspec rs;
 232
 233         if (ref->status != REF_STATUS_OK)
 234                 return;
 235
 236         rs.src = ref->name;
 237         rs.dst = NULL;
 238
 239         if (!remote_find_tracking(remote, &rs)) {
 240                 if (args.verbose)
 241                         fprintf(stderr, "updating local tracking ref '%s'\n", rs.dst);
 242                 if (ref->deletion) {
 243                         delete_ref(rs.dst, NULL);
 244                 } else
 245                         update_ref("update by push", rs.dst,
 246                                         ref->new_sha1, NULL, 0, 0);
 247                 free(rs.dst);
 248         }
 249 }
 250
 251 static const char *prettify_ref(const struct ref *ref)
 252 {
 253         const char *name = ref->name;
 254         return name + (
 255                 !prefixcmp(name, "refs/heads/") ? 11 :
 256                 !prefixcmp(name, "refs/tags/") ? 10 :
 257                 !prefixcmp(name, "refs/remotes/") ? 13 :
 258                 0);
 259 }
 260
 261 #define SUMMARY_WIDTH (2 * DEFAULT_ABBREV + 3)
 262
 263 static void print_ref_status(char flag, const char *summary, struct ref *to, struct ref *from, const char *msg)
 264 {
 265         fprintf(stderr, " %c %-*s ", flag, SUMMARY_WIDTH, summary);
 266         if (from)
 267                 fprintf(stderr, "%s -> %s", prettify_ref(from), prettify_ref(to));
 268         else
 269                 fputs(prettify_ref(to), stderr);
 270         if (msg) {
 271                 fputs(" (", stderr);
 272                 fputs(msg, stderr);
 273                 fputc(')', stderr);
 274         }
 275         fputc('\n', stderr);
 276 }
 277
 278 static const char *status_abbrev(unsigned char sha1[20])
 279 {
 280         return find_unique_abbrev(sha1, DEFAULT_ABBREV);
 281 }
 282
 283 static void print_ok_ref_status(struct ref *ref)
 284 {
 285         if (ref->deletion)
 286                 print_ref_status('-', "[deleted]", ref, NULL, NULL);
 287         else if (is_null_sha1(ref->old_sha1))
 288                 print_ref_status('*',
 289                         (!prefixcmp(ref->name, "refs/tags/") ? "[new tag]" :
 290                           "[new branch]"),
 291                         ref, ref->peer_ref, NULL);
 292         else {
 293                 char quickref[84];
 294                 char type;
 295                 const char *msg;
 296
 297                 strcpy(quickref, status_abbrev(ref->old_sha1));
 298                 if (ref->nonfastforward) {
 299                         strcat(quickref, "...");
 300                         type = '+';
 301                         msg = "forced update";
 302                 } else {
 303                         strcat(quickref, "..");
 304                         type = ' ';
 305                         msg = NULL;
 306                 }
 307                 strcat(quickref, status_abbrev(ref->new_sha1));
 308
 309                 print_ref_status(type, quickref, ref, ref->peer_ref, msg);
 310         }
 311 }
 312
 313 static int print_one_push_status(struct ref *ref, const char *dest, int count)
 314 {
 315         if (!count)
 316                 fprintf(stderr, "To %s\n", dest);
 317
 318         switch(ref->status) {
 319         case REF_STATUS_NONE:
 320                 print_ref_status('X', "[no match]", ref, NULL, NULL);
 321                 break;
 322         case REF_STATUS_REJECT_NODELETE:
 323                 print_ref_status('!', "[rejected]", ref, NULL,
 324                                 "remote does not support deleting refs");
 325                 break;
 326         case REF_STATUS_UPTODATE:
 327                 print_ref_status('=', "[up to date]", ref,
 328                                 ref->peer_ref, NULL);
 329                 break;
 330         case REF_STATUS_REJECT_NONFASTFORWARD:
 331                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 332                                 "non-fast forward");
 333                 break;
 334         case REF_STATUS_REMOTE_REJECT:
 335                 print_ref_status('!', "[remote rejected]", ref,
 336                                 ref->deletion ? NULL : ref->peer_ref,
 337                                 ref->remote_status);
 338                 break;
 339         case REF_STATUS_EXPECTING_REPORT:
 340                 print_ref_status('!', "[remote failure]", ref,
 341                                 ref->deletion ? NULL : ref->peer_ref,
 342                                 "remote failed to report status");
 343                 break;
 344         case REF_STATUS_OK:
 345                 print_ok_ref_status(ref);
 346                 break;
 347         }
 348
 349         return 1;
 350 }
 351
 352 static void print_push_status(const char *dest, struct ref *refs)
 353 {
 354         struct ref *ref;
 355         int n = 0;
 356
 357         if (args.verbose) {
 358                 for (ref = refs; ref; ref = ref->next)
 359                         if (ref->status == REF_STATUS_UPTODATE)
 360                                 n += print_one_push_status(ref, dest, n);
 361         }
 362
 363         for (ref = refs; ref; ref = ref->next)
 364                 if (ref->status == REF_STATUS_OK)
 365                         n += print_one_push_status(ref, dest, n);
 366
 367         for (ref = refs; ref; ref = ref->next) {
 368                 if (ref->status != REF_STATUS_NONE &&
 369                     ref->status != REF_STATUS_UPTODATE &&
 370                     ref->status != REF_STATUS_OK)
 371                         n += print_one_push_status(ref, dest, n);
 372         }
 373 }
 374
 375 static int refs_pushed(struct ref *ref)
 376 {
 377         for (; ref; ref = ref->next) {
 378                 switch(ref->status) {
 379                 case REF_STATUS_NONE:
 380                 case REF_STATUS_UPTODATE:
 381                         break;
 382                 default:
 383                         return 1;
 384                 }
 385         }
 386         return 0;
 387 }
 388
 389 static int do_send_pack(int in, int out, struct remote *remote, const char *dest, int nr_refspec, const char **refspec)
 390 {
 391         struct ref *ref;
 392         int new_refs;
 393         int ask_for_status_report = 0;
 394         int allow_deleting_refs = 0;
 395         int expect_status_report = 0;
 396         int flags = MATCH_REFS_NONE;
 397         int ret;
 398         struct extra_have_objects extra_have;
 399
 400         memset(&extra_have, 0, sizeof(extra_have));
 401         if (args.send_all)
 402                 flags |= MATCH_REFS_ALL;
 403         if (args.send_mirror)
 404                 flags |= MATCH_REFS_MIRROR;
 405
 406         /* No funny business with the matcher */
 407         remote_tail = get_remote_heads(in, &remote_refs, 0, NULL, REF_NORMAL,
 408                                        &extra_have);
 409         get_local_heads();
 410
 411         /* Does the other end support the reporting? */
 412         if (server_supports("report-status"))
 413                 ask_for_status_report = 1;
 414         if (server_supports("delete-refs"))
 415                 allow_deleting_refs = 1;
 416
 417         /* match them up */
 418         if (!remote_tail)
 419                 remote_tail = &remote_refs;
 420         if (match_refs(local_refs, remote_refs, &remote_tail,
 421                        nr_refspec, refspec, flags)) {
 422                 close(out);
 423                 return -1;
 424         }
 425
 426         if (!remote_refs) {
 427                 fprintf(stderr, "No refs in common and none specified; doing nothing.\n"
 428                         "Perhaps you should specify a branch such as 'master'.\n");
 429                 close(out);
 430                 return 0;
 431         }
 432
 433         /*
 434          * Finally, tell the other end!
 435          */
 436         new_refs = 0;
 437         for (ref = remote_refs; ref; ref = ref->next) {
 438                 const unsigned char *new_sha1;
 439
 440                 if (!ref->peer_ref) {
 441                         if (!args.send_mirror)
 442                                 continue;
 443                         new_sha1 = null_sha1;
 444                 }
 445                 else
 446                         new_sha1 = ref->peer_ref->new_sha1;
 447
 448
 449                 ref->deletion = is_null_sha1(new_sha1);
 450                 if (ref->deletion && !allow_deleting_refs) {
 451                         ref->status = REF_STATUS_REJECT_NODELETE;
 452                         continue;
 453                 }
 454                 if (!ref->deletion &&
 455                     !hashcmp(ref->old_sha1, new_sha1)) {
 456                         ref->status = REF_STATUS_UPTODATE;
 457                         continue;
 458                 }
 459
 460                 /* This part determines what can overwrite what.
 461                  * The rules are:
 462                  *
 463                  * (0) you can always use --force or +A:B notation to
 464                  *     selectively force individual ref pairs.
 465                  *
 466                  * (1) if the old thing does not exist, it is OK.
 467                  *
 468                  * (2) if you do not have the old thing, you are not allowed
 469                  *     to overwrite it; you would not know what you are losing
 470                  *     otherwise.
 471                  *
 472                  * (3) if both new and old are commit-ish, and new is a
 473                  *     descendant of old, it is OK.
 474                  *
 475                  * (4) regardless of all of the above, removing :B is
 476                  *     always allowed.
 477                  */
 478
 479                 ref->nonfastforward =
 480                     !ref->deletion &&
 481                     !is_null_sha1(ref->old_sha1) &&
 482                     (!has_sha1_file(ref->old_sha1)
 483                       || !ref_newer(new_sha1, ref->old_sha1));
 484
 485                 if (ref->nonfastforward && !ref->force && !args.force_update) {
 486                         ref->status = REF_STATUS_REJECT_NONFASTFORWARD;
 487                         continue;
 488                 }
 489
 490                 hashcpy(ref->new_sha1, new_sha1);
 491                 if (!ref->deletion)
 492                         new_refs++;
 493
 494                 if (!args.dry_run) {
 495                         char *old_hex = sha1_to_hex(ref->old_sha1);
 496                         char *new_hex = sha1_to_hex(ref->new_sha1);
 497
 498                         if (ask_for_status_report) {
 499                                 packet_write(out, "%s %s %s%c%s",
 500                                         old_hex, new_hex, ref->name, 0,
 501                                         "report-status");
 502                                 ask_for_status_report = 0;
 503                                 expect_status_report = 1;
 504                         }
 505                         else
 506                                 packet_write(out, "%s %s %s",
 507                                         old_hex, new_hex, ref->name);
 508                 }
 509                 ref->status = expect_status_report ?
 510                         REF_STATUS_EXPECTING_REPORT :
 511                         REF_STATUS_OK;
 512         }
 513
 514         packet_flush(out);
 515         if (new_refs && !args.dry_run) {
 516                 if (pack_objects(out, remote_refs, &extra_have) < 0)
 517                         return -1;
 518         }
 519         else
 520                 close(out);
 521
 522         if (expect_status_report)
 523                 ret = receive_status(in, remote_refs);
 524         else
 525                 ret = 0;
 526
 527         print_push_status(dest, remote_refs);
 528
 529         if (!args.dry_run && remote) {
 530                 for (ref = remote_refs; ref; ref = ref->next)
 531                         update_tracking_ref(remote, ref);
 532         }
 533
 534         if (!refs_pushed(remote_refs))
 535                 fprintf(stderr, "Everything up-to-date\n");
 536         if (ret < 0)
 537                 return ret;
 538         for (ref = remote_refs; ref; ref = ref->next) {
 539                 switch (ref->status) {
 540                 case REF_STATUS_NONE:
 541                 case REF_STATUS_UPTODATE:
 542                 case REF_STATUS_OK:
 543                         break;
 544                 default:
 545                         return -1;
 546                 }
 547         }
 548         return 0;
 549 }
 550
 551 static void verify_remote_names(int nr_heads, const char **heads)
 552 {
 553         int i;
 554
 555         for (i = 0; i < nr_heads; i++) {
 556                 const char *local = heads[i];
 557                 const char *remote = strrchr(heads[i], ':');
 558
 559                 if (*local == '+')
 560                         local++;
 561
 562                 /* A matching refspec is okay.  */
 563                 if (remote == local && remote[1] == '\0')
 564                         continue;
 565
 566                 remote = remote ? (remote + 1) : local;
 567                 switch (check_ref_format(remote)) {
 568                 case 0: /* ok */
 569                 case CHECK_REF_FORMAT_ONELEVEL:
 570                         /* ok but a single level -- that is fine for
 571                          * a match pattern.
 572                          */
 573                 case CHECK_REF_FORMAT_WILDCARD:
 574                         /* ok but ends with a pattern-match character */
 575                         continue;
 576                 }
 577                 die("remote part of refspec is not a valid name in %s",
 578                     heads[i]);
 579         }
 580 }
 581
 582 int cmd_send_pack(int argc, const char **argv, const char *prefix)
 583 {
 584         int i, nr_heads = 0;
 585         const char **heads = NULL;
 586         const char *remote_name = NULL;
 587         struct remote *remote = NULL;
 588         const char *dest = NULL;
 589
 590         argv++;
 591         for (i = 1; i < argc; i++, argv++) {
 592                 const char *arg = *argv;
 593
 594                 if (*arg == '-') {
 595                         if (!prefixcmp(arg, "--receive-pack=")) {
 596                                 args.receivepack = arg + 15;
 597                                 continue;
 598                         }
 599                         if (!prefixcmp(arg, "--exec=")) {
 600                                 args.receivepack = arg + 7;
 601                                 continue;
 602                         }
 603                         if (!prefixcmp(arg, "--remote=")) {
 604                                 remote_name = arg + 9;
 605                                 continue;
 606                         }
 607                         if (!strcmp(arg, "--all")) {
 608                                 args.send_all = 1;
 609                                 continue;
 610                         }
 611                         if (!strcmp(arg, "--dry-run")) {
 612                                 args.dry_run = 1;
 613                                 continue;
 614                         }
 615                         if (!strcmp(arg, "--mirror")) {
 616                                 args.send_mirror = 1;
 617                                 continue;
 618                         }
 619                         if (!strcmp(arg, "--force")) {
 620                                 args.force_update = 1;
 621                                 continue;
 622                         }
 623                         if (!strcmp(arg, "--verbose")) {
 624                                 args.verbose = 1;
 625                                 continue;
 626                         }
 627                         if (!strcmp(arg, "--thin")) {
 628                                 args.use_thin_pack = 1;
 629                                 continue;
 630                         }
 631                         usage(send_pack_usage);
 632                 }
 633                 if (!dest) {
 634                         dest = arg;
 635                         continue;
 636                 }
 637                 heads = (const char **) argv;
 638                 nr_heads = argc - i;
 639                 break;
 640         }
 641         if (!dest)
 642                 usage(send_pack_usage);
 643         /*
 644          * --all and --mirror are incompatible; neither makes sense
 645          * with any refspecs.
 646          */
 647         if ((heads && (args.send_all || args.send_mirror)) ||
 648                                         (args.send_all && args.send_mirror))
 649                 usage(send_pack_usage);
 650
 651         if (remote_name) {
 652                 remote = remote_get(remote_name);
 653                 if (!remote_has_url(remote, dest)) {
 654                         die("Destination %s is not a uri for %s",
 655                             dest, remote_name);
 656                 }
 657         }
 658
 659         return send_pack(&args, dest, remote, nr_heads, heads);
 660 }
 661
 662 int send_pack(struct send_pack_args *my_args,
 663               const char *dest, struct remote *remote,
 664               int nr_heads, const char **heads)
 665 {
 666         int fd[2], ret;
 667         struct child_process *conn;
 668
 669         memcpy(&args, my_args, sizeof(args));
 670
 671         verify_remote_names(nr_heads, heads);
 672
 673         conn = git_connect(fd, dest, args.receivepack, args.verbose ? CONNECT_VERBOSE : 0);
 674         ret = do_send_pack(fd[0], fd[1], remote, dest, nr_heads, heads);
 675         close(fd[0]);
 676         /* do_send_pack always closes fd[1] */
 677         ret |= finish_connect(conn);
 678         return !!ret;
 679 }