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