builtin-send-pack.c

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