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 *local_refs, **local_tail;
 137 static struct ref *remote_refs, **remote_tail;
 138
 139 static int one_local_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
 140 {
 141         struct ref *ref;
 142         int len;
 143
 144         /* we already know it starts with refs/ to get here */
 145         if (check_ref_format(refname + 5))
 146                 return 0;
 147
 148         len = strlen(refname) + 1;
 149         ref = xcalloc(1, sizeof(*ref) + len);
 150         hashcpy(ref->new_sha1, sha1);
 151         memcpy(ref->name, refname, len);
 152         *local_tail = ref;
 153         local_tail = &ref->next;
 154         return 0;
 155 }
 156
 157 static void get_local_heads(void)
 158 {
 159         local_tail = &local_refs;
 160         for_each_ref(one_local_ref, NULL);
 161 }
 162
 163 static int receive_status(int in, struct ref *refs)
 164 {
 165         struct ref *hint;
 166         char line[1000];
 167         int ret = 0;
 168         int len = packet_read_line(in, line, sizeof(line));
 169         if (len < 10 || memcmp(line, "unpack ", 7))
 170                 return error("did not receive remote status");
 171         if (memcmp(line, "unpack ok\n", 10)) {
 172                 char *p = line + strlen(line) - 1;
 173                 if (*p == '\n')
 174                         *p = '\0';
 175                 error("unpack failed: %s", line + 7);
 176                 ret = -1;
 177         }
 178         hint = NULL;
 179         while (1) {
 180                 char *refname;
 181                 char *msg;
 182                 len = packet_read_line(in, line, sizeof(line));
 183                 if (!len)
 184                         break;
 185                 if (len < 3 ||
 186                     (memcmp(line, "ok ", 3) && memcmp(line, "ng ", 3))) {
 187                         fprintf(stderr, "protocol error: %s\n", line);
 188                         ret = -1;
 189                         break;
 190                 }
 191
 192                 line[strlen(line)-1] = '\0';
 193                 refname = line + 3;
 194                 msg = strchr(refname, ' ');
 195                 if (msg)
 196                         *msg++ = '\0';
 197
 198                 /* first try searching at our hint, falling back to all refs */
 199                 if (hint)
 200                         hint = find_ref_by_name(hint, refname);
 201                 if (!hint)
 202                         hint = find_ref_by_name(refs, refname);
 203                 if (!hint) {
 204                         warning("remote reported status on unknown ref: %s",
 205                                         refname);
 206                         continue;
 207                 }
 208                 if (hint->status != REF_STATUS_EXPECTING_REPORT) {
 209                         warning("remote reported status on unexpected ref: %s",
 210                                         refname);
 211                         continue;
 212                 }
 213
 214                 if (line[0] == 'o' && line[1] == 'k')
 215                         hint->status = REF_STATUS_OK;
 216                 else {
 217                         hint->status = REF_STATUS_REMOTE_REJECT;
 218                         ret = -1;
 219                 }
 220                 if (msg)
 221                         hint->remote_status = xstrdup(msg);
 222                 /* start our next search from the next ref */
 223                 hint = hint->next;
 224         }
 225         return ret;
 226 }
 227
 228 static void update_tracking_ref(struct remote *remote, struct ref *ref)
 229 {
 230         struct refspec rs;
 231
 232         if (ref->status != REF_STATUS_OK && ref->status != REF_STATUS_UPTODATE)
 233                 return;
 234
 235         rs.src = ref->name;
 236         rs.dst = NULL;
 237
 238         if (!remote_find_tracking(remote, &rs)) {
 239                 if (args.verbose)
 240                         fprintf(stderr, "updating local tracking ref '%s'\n", rs.dst);
 241                 if (ref->deletion) {
 242                         delete_ref(rs.dst, NULL, 0);
 243                 } else
 244                         update_ref("update by push", rs.dst,
 245                                         ref->new_sha1, NULL, 0, 0);
 246                 free(rs.dst);
 247         }
 248 }
 249
 250 static const char *prettify_ref(const struct ref *ref)
 251 {
 252         const char *name = ref->name;
 253         return name + (
 254                 !prefixcmp(name, "refs/heads/") ? 11 :
 255                 !prefixcmp(name, "refs/tags/") ? 10 :
 256                 !prefixcmp(name, "refs/remotes/") ? 13 :
 257                 0);
 258 }
 259
 260 #define SUMMARY_WIDTH (2 * DEFAULT_ABBREV + 3)
 261
 262 static void print_ref_status(char flag, const char *summary, struct ref *to, struct ref *from, const char *msg)
 263 {
 264         fprintf(stderr, " %c %-*s ", flag, SUMMARY_WIDTH, summary);
 265         if (from)
 266                 fprintf(stderr, "%s -> %s", prettify_ref(from), prettify_ref(to));
 267         else
 268                 fputs(prettify_ref(to), stderr);
 269         if (msg) {
 270                 fputs(" (", stderr);
 271                 fputs(msg, stderr);
 272                 fputc(')', stderr);
 273         }
 274         fputc('\n', stderr);
 275 }
 276
 277 static const char *status_abbrev(unsigned char sha1[20])
 278 {
 279         return find_unique_abbrev(sha1, DEFAULT_ABBREV);
 280 }
 281
 282 static void print_ok_ref_status(struct ref *ref)
 283 {
 284         if (ref->deletion)
 285                 print_ref_status('-', "[deleted]", ref, NULL, NULL);
 286         else if (is_null_sha1(ref->old_sha1))
 287                 print_ref_status('*',
 288                         (!prefixcmp(ref->name, "refs/tags/") ? "[new tag]" :
 289                           "[new branch]"),
 290                         ref, ref->peer_ref, NULL);
 291         else {
 292                 char quickref[84];
 293                 char type;
 294                 const char *msg;
 295
 296                 strcpy(quickref, status_abbrev(ref->old_sha1));
 297                 if (ref->nonfastforward) {
 298                         strcat(quickref, "...");
 299                         type = '+';
 300                         msg = "forced update";
 301                 } else {
 302                         strcat(quickref, "..");
 303                         type = ' ';
 304                         msg = NULL;
 305                 }
 306                 strcat(quickref, status_abbrev(ref->new_sha1));
 307
 308                 print_ref_status(type, quickref, ref, ref->peer_ref, msg);
 309         }
 310 }
 311
 312 static int print_one_push_status(struct ref *ref, const char *dest, int count)
 313 {
 314         if (!count)
 315                 fprintf(stderr, "To %s\n", dest);
 316
 317         switch(ref->status) {
 318         case REF_STATUS_NONE:
 319                 print_ref_status('X', "[no match]", ref, NULL, NULL);
 320                 break;
 321         case REF_STATUS_REJECT_NODELETE:
 322                 print_ref_status('!', "[rejected]", ref, NULL,
 323                                 "remote does not support deleting refs");
 324                 break;
 325         case REF_STATUS_UPTODATE:
 326                 print_ref_status('=', "[up to date]", ref,
 327                                 ref->peer_ref, NULL);
 328                 break;
 329         case REF_STATUS_REJECT_NONFASTFORWARD:
 330                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 331                                 "non-fast forward");
 332                 break;
 333         case REF_STATUS_REMOTE_REJECT:
 334                 print_ref_status('!', "[remote rejected]", ref,
 335                                 ref->deletion ? NULL : ref->peer_ref,
 336                                 ref->remote_status);
 337                 break;
 338         case REF_STATUS_EXPECTING_REPORT:
 339                 print_ref_status('!', "[remote failure]", ref,
 340                                 ref->deletion ? NULL : ref->peer_ref,
 341                                 "remote failed to report status");
 342                 break;
 343         case REF_STATUS_OK:
 344                 print_ok_ref_status(ref);
 345                 break;
 346         }
 347
 348         return 1;
 349 }
 350
 351 static void print_push_status(const char *dest, struct ref *refs)
 352 {
 353         struct ref *ref;
 354         int n = 0;
 355
 356         if (args.verbose) {
 357                 for (ref = refs; ref; ref = ref->next)
 358                         if (ref->status == REF_STATUS_UPTODATE)
 359                                 n += print_one_push_status(ref, dest, n);
 360         }
 361
 362         for (ref = refs; ref; ref = ref->next)
 363                 if (ref->status == REF_STATUS_OK)
 364                         n += print_one_push_status(ref, dest, n);
 365
 366         for (ref = refs; ref; ref = ref->next) {
 367                 if (ref->status != REF_STATUS_NONE &&
 368                     ref->status != REF_STATUS_UPTODATE &&
 369                     ref->status != REF_STATUS_OK)
 370                         n += print_one_push_status(ref, dest, n);
 371         }
 372 }
 373
 374 static int refs_pushed(struct ref *ref)
 375 {
 376         for (; ref; ref = ref->next) {
 377                 switch(ref->status) {
 378                 case REF_STATUS_NONE:
 379                 case REF_STATUS_UPTODATE:
 380                         break;
 381                 default:
 382                         return 1;
 383                 }
 384         }
 385         return 0;
 386 }
 387
 388 static int do_send_pack(int in, int out, struct remote *remote, const char *dest, int nr_refspec, const char **refspec)
 389 {
 390         struct ref *ref;
 391         int new_refs;
 392         int ask_for_status_report = 0;
 393         int allow_deleting_refs = 0;
 394         int expect_status_report = 0;
 395         int flags = MATCH_REFS_NONE;
 396         int ret;
 397         struct extra_have_objects extra_have;
 398
 399         memset(&extra_have, 0, sizeof(extra_have));
 400         if (args.send_all)
 401                 flags |= MATCH_REFS_ALL;
 402         if (args.send_mirror)
 403                 flags |= MATCH_REFS_MIRROR;
 404
 405         /* No funny business with the matcher */
 406         remote_tail = get_remote_heads(in, &remote_refs, 0, NULL, REF_NORMAL,
 407                                        &extra_have);
 408         get_local_heads();
 409
 410         /* Does the other end support the reporting? */
 411         if (server_supports("report-status"))
 412                 ask_for_status_report = 1;
 413         if (server_supports("delete-refs"))
 414                 allow_deleting_refs = 1;
 415
 416         /* match them up */
 417         if (!remote_tail)
 418                 remote_tail = &remote_refs;
 419         if (match_refs(local_refs, remote_refs, &remote_tail,
 420                        nr_refspec, refspec, flags)) {
 421                 close(out);
 422                 return -1;
 423         }
 424
 425         if (!remote_refs) {
 426                 fprintf(stderr, "No refs in common and none specified; doing nothing.\n"
 427                         "Perhaps you should specify a branch such as 'master'.\n");
 428                 close(out);
 429                 return 0;
 430         }
 431
 432         /*
 433          * Finally, tell the other end!
 434          */
 435         new_refs = 0;
 436         for (ref = remote_refs; ref; ref = ref->next) {
 437
 438                 if (ref->peer_ref)
 439                         hashcpy(ref->new_sha1, ref->peer_ref->new_sha1);
 440                 else if (!args.send_mirror)
 441                         continue;
 442
 443                 ref->deletion = is_null_sha1(ref->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, ref->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(ref->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                 if (!ref->deletion)
 485                         new_refs++;
 486
 487                 if (!args.dry_run) {
 488                         char *old_hex = sha1_to_hex(ref->old_sha1);
 489                         char *new_hex = sha1_to_hex(ref->new_sha1);
 490
 491                         if (ask_for_status_report) {
 492                                 packet_write(out, "%s %s %s%c%s",
 493                                         old_hex, new_hex, ref->name, 0,
 494                                         "report-status");
 495                                 ask_for_status_report = 0;
 496                                 expect_status_report = 1;
 497                         }
 498                         else
 499                                 packet_write(out, "%s %s %s",
 500                                         old_hex, new_hex, ref->name);
 501                 }
 502                 ref->status = expect_status_report ?
 503                         REF_STATUS_EXPECTING_REPORT :
 504                         REF_STATUS_OK;
 505         }
 506
 507         packet_flush(out);
 508         if (new_refs && !args.dry_run) {
 509                 if (pack_objects(out, remote_refs, &extra_have) < 0)
 510                         return -1;
 511         }
 512         else
 513                 close(out);
 514
 515         if (expect_status_report)
 516                 ret = receive_status(in, remote_refs);
 517         else
 518                 ret = 0;
 519
 520         print_push_status(dest, remote_refs);
 521
 522         if (!args.dry_run && remote) {
 523                 for (ref = remote_refs; ref; ref = ref->next)
 524                         update_tracking_ref(remote, ref);
 525         }
 526
 527         if (!refs_pushed(remote_refs))
 528                 fprintf(stderr, "Everything up-to-date\n");
 529         if (ret < 0)
 530                 return ret;
 531         for (ref = remote_refs; ref; ref = ref->next) {
 532                 switch (ref->status) {
 533                 case REF_STATUS_NONE:
 534                 case REF_STATUS_UPTODATE:
 535                 case REF_STATUS_OK:
 536                         break;
 537                 default:
 538                         return -1;
 539                 }
 540         }
 541         return 0;
 542 }
 543
 544 static void verify_remote_names(int nr_heads, const char **heads)
 545 {
 546         int i;
 547
 548         for (i = 0; i < nr_heads; i++) {
 549                 const char *local = heads[i];
 550                 const char *remote = strrchr(heads[i], ':');
 551
 552                 if (*local == '+')
 553                         local++;
 554
 555                 /* A matching refspec is okay.  */
 556                 if (remote == local && remote[1] == '\0')
 557                         continue;
 558
 559                 remote = remote ? (remote + 1) : local;
 560                 switch (check_ref_format(remote)) {
 561                 case 0: /* ok */
 562                 case CHECK_REF_FORMAT_ONELEVEL:
 563                         /* ok but a single level -- that is fine for
 564                          * a match pattern.
 565                          */
 566                 case CHECK_REF_FORMAT_WILDCARD:
 567                         /* ok but ends with a pattern-match character */
 568                         continue;
 569                 }
 570                 die("remote part of refspec is not a valid name in %s",
 571                     heads[i]);
 572         }
 573 }
 574
 575 int cmd_send_pack(int argc, const char **argv, const char *prefix)
 576 {
 577         int i, nr_heads = 0;
 578         const char **heads = NULL;
 579         const char *remote_name = NULL;
 580         struct remote *remote = NULL;
 581         const char *dest = NULL;
 582
 583         argv++;
 584         for (i = 1; i < argc; i++, argv++) {
 585                 const char *arg = *argv;
 586
 587                 if (*arg == '-') {
 588                         if (!prefixcmp(arg, "--receive-pack=")) {
 589                                 args.receivepack = arg + 15;
 590                                 continue;
 591                         }
 592                         if (!prefixcmp(arg, "--exec=")) {
 593                                 args.receivepack = arg + 7;
 594                                 continue;
 595                         }
 596                         if (!prefixcmp(arg, "--remote=")) {
 597                                 remote_name = arg + 9;
 598                                 continue;
 599                         }
 600                         if (!strcmp(arg, "--all")) {
 601                                 args.send_all = 1;
 602                                 continue;
 603                         }
 604                         if (!strcmp(arg, "--dry-run")) {
 605                                 args.dry_run = 1;
 606                                 continue;
 607                         }
 608                         if (!strcmp(arg, "--mirror")) {
 609                                 args.send_mirror = 1;
 610                                 continue;
 611                         }
 612                         if (!strcmp(arg, "--force")) {
 613                                 args.force_update = 1;
 614                                 continue;
 615                         }
 616                         if (!strcmp(arg, "--verbose")) {
 617                                 args.verbose = 1;
 618                                 continue;
 619                         }
 620                         if (!strcmp(arg, "--thin")) {
 621                                 args.use_thin_pack = 1;
 622                                 continue;
 623                         }
 624                         usage(send_pack_usage);
 625                 }
 626                 if (!dest) {
 627                         dest = arg;
 628                         continue;
 629                 }
 630                 heads = (const char **) argv;
 631                 nr_heads = argc - i;
 632                 break;
 633         }
 634         if (!dest)
 635                 usage(send_pack_usage);
 636         /*
 637          * --all and --mirror are incompatible; neither makes sense
 638          * with any refspecs.
 639          */
 640         if ((heads && (args.send_all || args.send_mirror)) ||
 641                                         (args.send_all && args.send_mirror))
 642                 usage(send_pack_usage);
 643
 644         if (remote_name) {
 645                 remote = remote_get(remote_name);
 646                 if (!remote_has_url(remote, dest)) {
 647                         die("Destination %s is not a uri for %s",
 648                             dest, remote_name);
 649                 }
 650         }
 651
 652         return send_pack(&args, dest, remote, nr_heads, heads);
 653 }
 654
 655 int send_pack(struct send_pack_args *my_args,
 656               const char *dest, struct remote *remote,
 657               int nr_heads, const char **heads)
 658 {
 659         int fd[2], ret;
 660         struct child_process *conn;
 661
 662         memcpy(&args, my_args, sizeof(args));
 663
 664         verify_remote_names(nr_heads, heads);
 665
 666         conn = git_connect(fd, dest, args.receivepack, args.verbose ? CONNECT_VERBOSE : 0);
 667         ret = do_send_pack(fd[0], fd[1], remote, dest, nr_heads, heads);
 668         close(fd[0]);
 669         /* do_send_pack always closes fd[1] */
 670         ret |= finish_connect(conn);
 671         return !!ret;
 672 }