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