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