builtin-send-pack.c

   1 #include "cache.h"
   2 #include "commit.h"
   3 #include "refs.h"
   4 #include "pkt-line.h"
   5 #include "sideband.h"
   6 #include "run-command.h"
   7 #include "remote.h"
   8 #include "send-pack.h"
   9 #include "quote.h"
  10
  11 static const char send_pack_usage[] =
  12 "git send-pack [--all | --mirror] [--dry-run] [--force] [--receive-pack=<git-receive-pack>] [--verbose] [--thin] [<host>:]<directory> [<ref>...]\n"
  13 "  --all and explicit <ref> specification are mutually exclusive.";
  14
  15 static struct send_pack_args args;
  16
  17 static int feed_object(const unsigned char *sha1, int fd, int negative)
  18 {
  19         char buf[42];
  20
  21         if (negative && !has_sha1_file(sha1))
  22                 return 1;
  23
  24         memcpy(buf + negative, sha1_to_hex(sha1), 40);
  25         if (negative)
  26                 buf[0] = '^';
  27         buf[40 + negative] = '\n';
  28         return write_or_whine(fd, buf, 41 + negative, "send-pack: send refs");
  29 }
  30
  31 /*
  32  * Make a pack stream and spit it out into file descriptor fd
  33  */
  34 static int pack_objects(int fd, struct ref *refs, struct extra_have_objects *extra, struct send_pack_args *args)
  35 {
  36         /*
  37          * The child becomes pack-objects --revs; we feed
  38          * the revision parameters to it via its stdin and
  39          * let its stdout go back to the other end.
  40          */
  41         const char *argv[] = {
  42                 "pack-objects",
  43                 "--all-progress-implied",
  44                 "--revs",
  45                 "--stdout",
  46                 NULL,
  47                 NULL,
  48                 NULL,
  49                 NULL,
  50         };
  51         struct child_process po;
  52         int i;
  53
  54         i = 4;
  55         if (args->use_thin_pack)
  56                 argv[i++] = "--thin";
  57         if (args->use_ofs_delta)
  58                 argv[i++] = "--delta-base-offset";
  59         if (args->quiet)
  60                 argv[i++] = "-q";
  61         memset(&po, 0, sizeof(po));
  62         po.argv = argv;
  63         po.in = -1;
  64         po.out = args->stateless_rpc ? -1 : fd;
  65         po.git_cmd = 1;
  66         if (start_command(&po))
  67                 die_errno("git pack-objects failed");
  68
  69         /*
  70          * We feed the pack-objects we just spawned with revision
  71          * parameters by writing to the pipe.
  72          */
  73         for (i = 0; i < extra->nr; i++)
  74                 if (!feed_object(extra->array[i], po.in, 1))
  75                         break;
  76
  77         while (refs) {
  78                 if (!is_null_sha1(refs->old_sha1) &&
  79                     !feed_object(refs->old_sha1, po.in, 1))
  80                         break;
  81                 if (!is_null_sha1(refs->new_sha1) &&
  82                     !feed_object(refs->new_sha1, po.in, 0))
  83                         break;
  84                 refs = refs->next;
  85         }
  86
  87         close(po.in);
  88
  89         if (args->stateless_rpc) {
  90                 char *buf = xmalloc(LARGE_PACKET_MAX);
  91                 while (1) {
  92                         ssize_t n = xread(po.out, buf, LARGE_PACKET_MAX);
  93                         if (n <= 0)
  94                                 break;
  95                         send_sideband(fd, -1, buf, n, LARGE_PACKET_MAX);
  96                 }
  97                 free(buf);
  98                 close(po.out);
  99                 po.out = -1;
 100         }
 101
 102         if (finish_command(&po))
 103                 return error("pack-objects died with strange error");
 104         return 0;
 105 }
 106
 107 static int receive_status(int in, struct ref *refs)
 108 {
 109         struct ref *hint;
 110         char line[1000];
 111         int ret = 0;
 112         int len = packet_read_line(in, line, sizeof(line));
 113         if (len < 10 || memcmp(line, "unpack ", 7))
 114                 return error("did not receive remote status");
 115         if (memcmp(line, "unpack ok\n", 10)) {
 116                 char *p = line + strlen(line) - 1;
 117                 if (*p == '\n')
 118                         *p = '\0';
 119                 error("unpack failed: %s", line + 7);
 120                 ret = -1;
 121         }
 122         hint = NULL;
 123         while (1) {
 124                 char *refname;
 125                 char *msg;
 126                 len = packet_read_line(in, line, sizeof(line));
 127                 if (!len)
 128                         break;
 129                 if (len < 3 ||
 130                     (memcmp(line, "ok ", 3) && memcmp(line, "ng ", 3))) {
 131                         fprintf(stderr, "protocol error: %s\n", line);
 132                         ret = -1;
 133                         break;
 134                 }
 135
 136                 line[strlen(line)-1] = '\0';
 137                 refname = line + 3;
 138                 msg = strchr(refname, ' ');
 139                 if (msg)
 140                         *msg++ = '\0';
 141
 142                 /* first try searching at our hint, falling back to all refs */
 143                 if (hint)
 144                         hint = find_ref_by_name(hint, refname);
 145                 if (!hint)
 146                         hint = find_ref_by_name(refs, refname);
 147                 if (!hint) {
 148                         warning("remote reported status on unknown ref: %s",
 149                                         refname);
 150                         continue;
 151                 }
 152                 if (hint->status != REF_STATUS_EXPECTING_REPORT) {
 153                         warning("remote reported status on unexpected ref: %s",
 154                                         refname);
 155                         continue;
 156                 }
 157
 158                 if (line[0] == 'o' && line[1] == 'k')
 159                         hint->status = REF_STATUS_OK;
 160                 else {
 161                         hint->status = REF_STATUS_REMOTE_REJECT;
 162                         ret = -1;
 163                 }
 164                 if (msg)
 165                         hint->remote_status = xstrdup(msg);
 166                 /* start our next search from the next ref */
 167                 hint = hint->next;
 168         }
 169         return ret;
 170 }
 171
 172 static void update_tracking_ref(struct remote *remote, struct ref *ref)
 173 {
 174         struct refspec rs;
 175
 176         if (ref->status != REF_STATUS_OK && ref->status != REF_STATUS_UPTODATE)
 177                 return;
 178
 179         rs.src = ref->name;
 180         rs.dst = NULL;
 181
 182         if (!remote_find_tracking(remote, &rs)) {
 183                 if (args.verbose)
 184                         fprintf(stderr, "updating local tracking ref '%s'\n", rs.dst);
 185                 if (ref->deletion) {
 186                         delete_ref(rs.dst, NULL, 0);
 187                 } else
 188                         update_ref("update by push", rs.dst,
 189                                         ref->new_sha1, NULL, 0, 0);
 190                 free(rs.dst);
 191         }
 192 }
 193
 194 #define SUMMARY_WIDTH (2 * DEFAULT_ABBREV + 3)
 195
 196 static void print_ref_status(char flag, const char *summary, struct ref *to, struct ref *from, const char *msg)
 197 {
 198         fprintf(stderr, " %c %-*s ", flag, SUMMARY_WIDTH, summary);
 199         if (from)
 200                 fprintf(stderr, "%s -> %s", prettify_refname(from->name), prettify_refname(to->name));
 201         else
 202                 fputs(prettify_refname(to->name), stderr);
 203         if (msg) {
 204                 fputs(" (", stderr);
 205                 fputs(msg, stderr);
 206                 fputc(')', stderr);
 207         }
 208         fputc('\n', stderr);
 209 }
 210
 211 static const char *status_abbrev(unsigned char sha1[20])
 212 {
 213         return find_unique_abbrev(sha1, DEFAULT_ABBREV);
 214 }
 215
 216 static void print_ok_ref_status(struct ref *ref)
 217 {
 218         if (ref->deletion)
 219                 print_ref_status('-', "[deleted]", ref, NULL, NULL);
 220         else if (is_null_sha1(ref->old_sha1))
 221                 print_ref_status('*',
 222                         (!prefixcmp(ref->name, "refs/tags/") ? "[new tag]" :
 223                           "[new branch]"),
 224                         ref, ref->peer_ref, NULL);
 225         else {
 226                 char quickref[84];
 227                 char type;
 228                 const char *msg;
 229
 230                 strcpy(quickref, status_abbrev(ref->old_sha1));
 231                 if (ref->nonfastforward) {
 232                         strcat(quickref, "...");
 233                         type = '+';
 234                         msg = "forced update";
 235                 } else {
 236                         strcat(quickref, "..");
 237                         type = ' ';
 238                         msg = NULL;
 239                 }
 240                 strcat(quickref, status_abbrev(ref->new_sha1));
 241
 242                 print_ref_status(type, quickref, ref, ref->peer_ref, msg);
 243         }
 244 }
 245
 246 static int print_one_push_status(struct ref *ref, const char *dest, int count)
 247 {
 248         if (!count)
 249                 fprintf(stderr, "To %s\n", dest);
 250
 251         switch(ref->status) {
 252         case REF_STATUS_NONE:
 253                 print_ref_status('X', "[no match]", ref, NULL, NULL);
 254                 break;
 255         case REF_STATUS_REJECT_NODELETE:
 256                 print_ref_status('!', "[rejected]", ref, NULL,
 257                                 "remote does not support deleting refs");
 258                 break;
 259         case REF_STATUS_UPTODATE:
 260                 print_ref_status('=', "[up to date]", ref,
 261                                 ref->peer_ref, NULL);
 262                 break;
 263         case REF_STATUS_REJECT_NONFASTFORWARD:
 264                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 265                                 "non-fast-forward");
 266                 break;
 267         case REF_STATUS_REMOTE_REJECT:
 268                 print_ref_status('!', "[remote rejected]", ref,
 269                                 ref->deletion ? NULL : ref->peer_ref,
 270                                 ref->remote_status);
 271                 break;
 272         case REF_STATUS_EXPECTING_REPORT:
 273                 print_ref_status('!', "[remote failure]", ref,
 274                                 ref->deletion ? NULL : ref->peer_ref,
 275                                 "remote failed to report status");
 276                 break;
 277         case REF_STATUS_OK:
 278                 print_ok_ref_status(ref);
 279                 break;
 280         }
 281
 282         return 1;
 283 }
 284
 285 static void print_push_status(const char *dest, struct ref *refs)
 286 {
 287         struct ref *ref;
 288         int n = 0;
 289
 290         if (args.verbose) {
 291                 for (ref = refs; ref; ref = ref->next)
 292                         if (ref->status == REF_STATUS_UPTODATE)
 293                                 n += print_one_push_status(ref, dest, n);
 294         }
 295
 296         for (ref = refs; ref; ref = ref->next)
 297                 if (ref->status == REF_STATUS_OK)
 298                         n += print_one_push_status(ref, dest, n);
 299
 300         for (ref = refs; ref; ref = ref->next) {
 301                 if (ref->status != REF_STATUS_NONE &&
 302                     ref->status != REF_STATUS_UPTODATE &&
 303                     ref->status != REF_STATUS_OK)
 304                         n += print_one_push_status(ref, dest, n);
 305         }
 306 }
 307
 308 static int refs_pushed(struct ref *ref)
 309 {
 310         for (; ref; ref = ref->next) {
 311                 switch(ref->status) {
 312                 case REF_STATUS_NONE:
 313                 case REF_STATUS_UPTODATE:
 314                         break;
 315                 default:
 316                         return 1;
 317                 }
 318         }
 319         return 0;
 320 }
 321
 322 static void print_helper_status(struct ref *ref)
 323 {
 324         struct strbuf buf = STRBUF_INIT;
 325
 326         for (; ref; ref = ref->next) {
 327                 const char *msg = NULL;
 328                 const char *res;
 329
 330                 switch(ref->status) {
 331                 case REF_STATUS_NONE:
 332                         res = "error";
 333                         msg = "no match";
 334                         break;
 335
 336                 case REF_STATUS_OK:
 337                         res = "ok";
 338                         break;
 339
 340                 case REF_STATUS_UPTODATE:
 341                         res = "ok";
 342                         msg = "up to date";
 343                         break;
 344
 345                 case REF_STATUS_REJECT_NONFASTFORWARD:
 346                         res = "error";
 347                         msg = "non-fast forward";
 348                         break;
 349
 350                 case REF_STATUS_REJECT_NODELETE:
 351                 case REF_STATUS_REMOTE_REJECT:
 352                         res = "error";
 353                         break;
 354
 355                 case REF_STATUS_EXPECTING_REPORT:
 356                 default:
 357                         continue;
 358                 }
 359
 360                 strbuf_reset(&buf);
 361                 strbuf_addf(&buf, "%s %s", res, ref->name);
 362                 if (ref->remote_status)
 363                         msg = ref->remote_status;
 364                 if (msg) {
 365                         strbuf_addch(&buf, ' ');
 366                         quote_two_c_style(&buf, "", msg, 0);
 367                 }
 368                 strbuf_addch(&buf, '\n');
 369
 370                 safe_write(1, buf.buf, buf.len);
 371         }
 372         strbuf_release(&buf);
 373 }
 374
 375 int send_pack(struct send_pack_args *args,
 376               int fd[], struct child_process *conn,
 377               struct ref *remote_refs,
 378               struct extra_have_objects *extra_have)
 379 {
 380         int in = fd[0];
 381         int out = fd[1];
 382         struct strbuf req_buf = STRBUF_INIT;
 383         struct ref *ref;
 384         int new_refs;
 385         int ask_for_status_report = 0;
 386         int allow_deleting_refs = 0;
 387         int expect_status_report = 0;
 388         int ret;
 389
 390         /* Does the other end support the reporting? */
 391         if (server_supports("report-status"))
 392                 ask_for_status_report = 1;
 393         if (server_supports("delete-refs"))
 394                 allow_deleting_refs = 1;
 395         if (server_supports("ofs-delta"))
 396                 args->use_ofs_delta = 1;
 397
 398         if (!remote_refs) {
 399                 fprintf(stderr, "No refs in common and none specified; doing nothing.\n"
 400                         "Perhaps you should specify a branch such as 'master'.\n");
 401                 return 0;
 402         }
 403
 404         /*
 405          * Finally, tell the other end!
 406          */
 407         new_refs = 0;
 408         for (ref = remote_refs; ref; ref = ref->next) {
 409
 410                 if (ref->peer_ref)
 411                         hashcpy(ref->new_sha1, ref->peer_ref->new_sha1);
 412                 else if (!args->send_mirror)
 413                         continue;
 414
 415                 ref->deletion = is_null_sha1(ref->new_sha1);
 416                 if (ref->deletion && !allow_deleting_refs) {
 417                         ref->status = REF_STATUS_REJECT_NODELETE;
 418                         continue;
 419                 }
 420                 if (!ref->deletion &&
 421                     !hashcmp(ref->old_sha1, ref->new_sha1)) {
 422                         ref->status = REF_STATUS_UPTODATE;
 423                         continue;
 424                 }
 425
 426                 /* This part determines what can overwrite what.
 427                  * The rules are:
 428                  *
 429                  * (0) you can always use --force or +A:B notation to
 430                  *     selectively force individual ref pairs.
 431                  *
 432                  * (1) if the old thing does not exist, it is OK.
 433                  *
 434                  * (2) if you do not have the old thing, you are not allowed
 435                  *     to overwrite it; you would not know what you are losing
 436                  *     otherwise.
 437                  *
 438                  * (3) if both new and old are commit-ish, and new is a
 439                  *     descendant of old, it is OK.
 440                  *
 441                  * (4) regardless of all of the above, removing :B is
 442                  *     always allowed.
 443                  */
 444
 445                 ref->nonfastforward =
 446                     !ref->deletion &&
 447                     !is_null_sha1(ref->old_sha1) &&
 448                     (!has_sha1_file(ref->old_sha1)
 449                       || !ref_newer(ref->new_sha1, ref->old_sha1));
 450
 451                 if (ref->nonfastforward && !ref->force && !args->force_update) {
 452                         ref->status = REF_STATUS_REJECT_NONFASTFORWARD;
 453                         continue;
 454                 }
 455
 456                 if (!ref->deletion)
 457                         new_refs++;
 458
 459                 if (!args->dry_run) {
 460                         char *old_hex = sha1_to_hex(ref->old_sha1);
 461                         char *new_hex = sha1_to_hex(ref->new_sha1);
 462
 463                         if (ask_for_status_report) {
 464                                 packet_buf_write(&req_buf, "%s %s %s%c%s",
 465                                         old_hex, new_hex, ref->name, 0,
 466                                         "report-status");
 467                                 ask_for_status_report = 0;
 468                                 expect_status_report = 1;
 469                         }
 470                         else
 471                                 packet_buf_write(&req_buf, "%s %s %s",
 472                                         old_hex, new_hex, ref->name);
 473                 }
 474                 ref->status = expect_status_report ?
 475                         REF_STATUS_EXPECTING_REPORT :
 476                         REF_STATUS_OK;
 477         }
 478
 479         if (args->stateless_rpc) {
 480                 if (!args->dry_run) {
 481                         packet_buf_flush(&req_buf);
 482                         send_sideband(out, -1, req_buf.buf, req_buf.len, LARGE_PACKET_MAX);
 483                 }
 484         } else {
 485                 safe_write(out, req_buf.buf, req_buf.len);
 486                 packet_flush(out);
 487         }
 488         strbuf_release(&req_buf);
 489
 490         if (new_refs && !args->dry_run) {
 491                 if (pack_objects(out, remote_refs, extra_have, args) < 0) {
 492                         for (ref = remote_refs; ref; ref = ref->next)
 493                                 ref->status = REF_STATUS_NONE;
 494                         return -1;
 495                 }
 496         }
 497         if (args->stateless_rpc && !args->dry_run)
 498                 packet_flush(out);
 499
 500         if (expect_status_report)
 501                 ret = receive_status(in, remote_refs);
 502         else
 503                 ret = 0;
 504         if (args->stateless_rpc)
 505                 packet_flush(out);
 506
 507         if (ret < 0)
 508                 return ret;
 509         for (ref = remote_refs; ref; ref = ref->next) {
 510                 switch (ref->status) {
 511                 case REF_STATUS_NONE:
 512                 case REF_STATUS_UPTODATE:
 513                 case REF_STATUS_OK:
 514                         break;
 515                 default:
 516                         return -1;
 517                 }
 518         }
 519         return 0;
 520 }
 521
 522 static void verify_remote_names(int nr_heads, const char **heads)
 523 {
 524         int i;
 525
 526         for (i = 0; i < nr_heads; i++) {
 527                 const char *local = heads[i];
 528                 const char *remote = strrchr(heads[i], ':');
 529
 530                 if (*local == '+')
 531                         local++;
 532
 533                 /* A matching refspec is okay.  */
 534                 if (remote == local && remote[1] == '\0')
 535                         continue;
 536
 537                 remote = remote ? (remote + 1) : local;
 538                 switch (check_ref_format(remote)) {
 539                 case 0: /* ok */
 540                 case CHECK_REF_FORMAT_ONELEVEL:
 541                         /* ok but a single level -- that is fine for
 542                          * a match pattern.
 543                          */
 544                 case CHECK_REF_FORMAT_WILDCARD:
 545                         /* ok but ends with a pattern-match character */
 546                         continue;
 547                 }
 548                 die("remote part of refspec is not a valid name in %s",
 549                     heads[i]);
 550         }
 551 }
 552
 553 int cmd_send_pack(int argc, const char **argv, const char *prefix)
 554 {
 555         int i, nr_refspecs = 0;
 556         const char **refspecs = NULL;
 557         const char *remote_name = NULL;
 558         struct remote *remote = NULL;
 559         const char *dest = NULL;
 560         int fd[2];
 561         struct child_process *conn;
 562         struct extra_have_objects extra_have;
 563         struct ref *remote_refs, *local_refs;
 564         int ret;
 565         int helper_status = 0;
 566         int send_all = 0;
 567         const char *receivepack = "git-receive-pack";
 568         int flags;
 569
 570         argv++;
 571         for (i = 1; i < argc; i++, argv++) {
 572                 const char *arg = *argv;
 573
 574                 if (*arg == '-') {
 575                         if (!prefixcmp(arg, "--receive-pack=")) {
 576                                 receivepack = arg + 15;
 577                                 continue;
 578                         }
 579                         if (!prefixcmp(arg, "--exec=")) {
 580                                 receivepack = arg + 7;
 581                                 continue;
 582                         }
 583                         if (!prefixcmp(arg, "--remote=")) {
 584                                 remote_name = arg + 9;
 585                                 continue;
 586                         }
 587                         if (!strcmp(arg, "--all")) {
 588                                 send_all = 1;
 589                                 continue;
 590                         }
 591                         if (!strcmp(arg, "--dry-run")) {
 592                                 args.dry_run = 1;
 593                                 continue;
 594                         }
 595                         if (!strcmp(arg, "--mirror")) {
 596                                 args.send_mirror = 1;
 597                                 continue;
 598                         }
 599                         if (!strcmp(arg, "--force")) {
 600                                 args.force_update = 1;
 601                                 continue;
 602                         }
 603                         if (!strcmp(arg, "--verbose")) {
 604                                 args.verbose = 1;
 605                                 continue;
 606                         }
 607                         if (!strcmp(arg, "--thin")) {
 608                                 args.use_thin_pack = 1;
 609                                 continue;
 610                         }
 611                         if (!strcmp(arg, "--stateless-rpc")) {
 612                                 args.stateless_rpc = 1;
 613                                 continue;
 614                         }
 615                         if (!strcmp(arg, "--helper-status")) {
 616                                 helper_status = 1;
 617                                 continue;
 618                         }
 619                         usage(send_pack_usage);
 620                 }
 621                 if (!dest) {
 622                         dest = arg;
 623                         continue;
 624                 }
 625                 refspecs = (const char **) argv;
 626                 nr_refspecs = argc - i;
 627                 break;
 628         }
 629         if (!dest)
 630                 usage(send_pack_usage);
 631         /*
 632          * --all and --mirror are incompatible; neither makes sense
 633          * with any refspecs.
 634          */
 635         if ((refspecs && (send_all || args.send_mirror)) ||
 636             (send_all && args.send_mirror))
 637                 usage(send_pack_usage);
 638
 639         if (remote_name) {
 640                 remote = remote_get(remote_name);
 641                 if (!remote_has_url(remote, dest)) {
 642                         die("Destination %s is not a uri for %s",
 643                             dest, remote_name);
 644                 }
 645         }
 646
 647         if (args.stateless_rpc) {
 648                 conn = NULL;
 649                 fd[0] = 0;
 650                 fd[1] = 1;
 651         } else {
 652                 conn = git_connect(fd, dest, receivepack,
 653                         args.verbose ? CONNECT_VERBOSE : 0);
 654         }
 655
 656         memset(&extra_have, 0, sizeof(extra_have));
 657
 658         get_remote_heads(fd[0], &remote_refs, 0, NULL, REF_NORMAL,
 659                          &extra_have);
 660
 661         verify_remote_names(nr_refspecs, refspecs);
 662
 663         local_refs = get_local_heads();
 664
 665         flags = MATCH_REFS_NONE;
 666
 667         if (send_all)
 668                 flags |= MATCH_REFS_ALL;
 669         if (args.send_mirror)
 670                 flags |= MATCH_REFS_MIRROR;
 671
 672         /* match them up */
 673         if (match_refs(local_refs, &remote_refs, nr_refspecs, refspecs, flags))
 674                 return -1;
 675
 676         ret = send_pack(&args, fd, conn, remote_refs, &extra_have);
 677
 678         if (helper_status)
 679                 print_helper_status(remote_refs);
 680
 681         close(fd[1]);
 682         close(fd[0]);
 683
 684         ret |= finish_connect(conn);
 685
 686         if (!helper_status)
 687                 print_push_status(dest, remote_refs);
 688
 689         if (!args.dry_run && remote) {
 690                 struct ref *ref;
 691                 for (ref = remote_refs; ref; ref = ref->next)
 692                         update_tracking_ref(remote, ref);
 693         }
 694
 695         if (!ret && !refs_pushed(remote_refs))
 696                 fprintf(stderr, "Everything up-to-date\n");
 697
 698         return ret;
 699 }