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