builtin-send-pack.c

   1 #include "cache.h"
   2 #include "commit.h"
   3 #include "tag.h"
   4 #include "refs.h"
   5 #include "pkt-line.h"
   6 #include "run-command.h"
   7 #include "remote.h"
   8 #include "send-pack.h"
   9
  10 static const char send_pack_usage[] =
  11 "git-send-pack [--all | --mirror] [--dry-run] [--force] [--receive-pack=<git-receive-pack>] [--verbose] [--thin] [<host>:]<directory> [<ref>...]\n"
  12 "  --all and explicit <ref> specification are mutually exclusive.";
  13
  14 static struct send_pack_args args = {
  15         /* .receivepack = */ "git-receive-pack",
  16 };
  17
  18 /*
  19  * Make a pack stream and spit it out into file descriptor fd
  20  */
  21 static int pack_objects(int fd, struct ref *refs)
  22 {
  23         /*
  24          * The child becomes pack-objects --revs; we feed
  25          * the revision parameters to it via its stdin and
  26          * let its stdout go back to the other end.
  27          */
  28         const char *argv[] = {
  29                 "pack-objects",
  30                 "--all-progress",
  31                 "--revs",
  32                 "--stdout",
  33                 NULL,
  34                 NULL,
  35         };
  36         struct child_process po;
  37
  38         if (args.use_thin_pack)
  39                 argv[4] = "--thin";
  40         memset(&po, 0, sizeof(po));
  41         po.argv = argv;
  42         po.in = -1;
  43         po.out = fd;
  44         po.git_cmd = 1;
  45         if (start_command(&po))
  46                 die("git-pack-objects failed (%s)", strerror(errno));
  47
  48         /*
  49          * We feed the pack-objects we just spawned with revision
  50          * parameters by writing to the pipe.
  51          */
  52         while (refs) {
  53                 char buf[42];
  54
  55                 if (!is_null_sha1(refs->old_sha1) &&
  56                     has_sha1_file(refs->old_sha1)) {
  57                         memcpy(buf + 1, sha1_to_hex(refs->old_sha1), 40);
  58                         buf[0] = '^';
  59                         buf[41] = '\n';
  60                         if (!write_or_whine(po.in, buf, 42,
  61                                                 "send-pack: send refs"))
  62                                 break;
  63                 }
  64                 if (!is_null_sha1(refs->new_sha1)) {
  65                         memcpy(buf, sha1_to_hex(refs->new_sha1), 40);
  66                         buf[40] = '\n';
  67                         if (!write_or_whine(po.in, buf, 41,
  68                                                 "send-pack: send refs"))
  69                                 break;
  70                 }
  71                 refs = refs->next;
  72         }
  73
  74         if (finish_command(&po))
  75                 return error("pack-objects died with strange error");
  76         return 0;
  77 }
  78
  79 static void unmark_and_free(struct commit_list *list, unsigned int mark)
  80 {
  81         while (list) {
  82                 struct commit_list *temp = list;
  83                 temp->item->object.flags &= ~mark;
  84                 list = temp->next;
  85                 free(temp);
  86         }
  87 }
  88
  89 static int ref_newer(const unsigned char *new_sha1,
  90                      const unsigned char *old_sha1)
  91 {
  92         struct object *o;
  93         struct commit *old, *new;
  94         struct commit_list *list, *used;
  95         int found = 0;
  96
  97         /* Both new and old must be commit-ish and new is descendant of
  98          * old.  Otherwise we require --force.
  99          */
 100         o = deref_tag(parse_object(old_sha1), NULL, 0);
 101         if (!o || o->type != OBJ_COMMIT)
 102                 return 0;
 103         old = (struct commit *) o;
 104
 105         o = deref_tag(parse_object(new_sha1), NULL, 0);
 106         if (!o || o->type != OBJ_COMMIT)
 107                 return 0;
 108         new = (struct commit *) o;
 109
 110         if (parse_commit(new) < 0)
 111                 return 0;
 112
 113         used = list = NULL;
 114         commit_list_insert(new, &list);
 115         while (list) {
 116                 new = pop_most_recent_commit(&list, 1);
 117                 commit_list_insert(new, &used);
 118                 if (new == old) {
 119                         found = 1;
 120                         break;
 121                 }
 122         }
 123         unmark_and_free(list, 1);
 124         unmark_and_free(used, 1);
 125         return found;
 126 }
 127
 128 static struct ref *local_refs, **local_tail;
 129 static struct ref *remote_refs, **remote_tail;
 130
 131 static int one_local_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
 132 {
 133         struct ref *ref;
 134         int len = strlen(refname) + 1;
 135         ref = xcalloc(1, sizeof(*ref) + len);
 136         hashcpy(ref->new_sha1, sha1);
 137         memcpy(ref->name, refname, len);
 138         *local_tail = ref;
 139         local_tail = &ref->next;
 140         return 0;
 141 }
 142
 143 static void get_local_heads(void)
 144 {
 145         local_tail = &local_refs;
 146         for_each_ref(one_local_ref, NULL);
 147 }
 148
 149 static int receive_status(int in)
 150 {
 151         char line[1000];
 152         int ret = 0;
 153         int len = packet_read_line(in, line, sizeof(line));
 154         if (len < 10 || memcmp(line, "unpack ", 7)) {
 155                 fprintf(stderr, "did not receive status back\n");
 156                 return -1;
 157         }
 158         if (memcmp(line, "unpack ok\n", 10)) {
 159                 fputs(line, stderr);
 160                 ret = -1;
 161         }
 162         while (1) {
 163                 len = packet_read_line(in, line, sizeof(line));
 164                 if (!len)
 165                         break;
 166                 if (len < 3 ||
 167                     (memcmp(line, "ok", 2) && memcmp(line, "ng", 2))) {
 168                         fprintf(stderr, "protocol error: %s\n", line);
 169                         ret = -1;
 170                         break;
 171                 }
 172                 if (!memcmp(line, "ok", 2))
 173                         continue;
 174                 fputs(line, stderr);
 175                 ret = -1;
 176         }
 177         return ret;
 178 }
 179
 180 static void update_tracking_ref(struct remote *remote, struct ref *ref)
 181 {
 182         struct refspec rs;
 183         int will_delete_ref;
 184
 185         rs.src = ref->name;
 186         rs.dst = NULL;
 187
 188         if (!ref->peer_ref)
 189                 return;
 190
 191         will_delete_ref = is_null_sha1(ref->peer_ref->new_sha1);
 192
 193         if (!will_delete_ref &&
 194                         !hashcmp(ref->old_sha1, ref->peer_ref->new_sha1))
 195                 return;
 196
 197         if (!remote_find_tracking(remote, &rs)) {
 198                 if (args.verbose)
 199                         fprintf(stderr, "updating local tracking ref '%s'\n", rs.dst);
 200                 if (is_null_sha1(ref->peer_ref->new_sha1)) {
 201                         if (delete_ref(rs.dst, NULL))
 202                                 error("Failed to delete");
 203                 } else
 204                         update_ref("update by push", rs.dst,
 205                                         ref->new_sha1, NULL, 0, 0);
 206                 free(rs.dst);
 207         }
 208 }
 209
 210 static const char *prettify_ref(const struct ref *ref)
 211 {
 212         const char *name = ref->name;
 213         return name + (
 214                 !prefixcmp(name, "refs/heads/") ? 11 :
 215                 !prefixcmp(name, "refs/tags/") ? 10 :
 216                 !prefixcmp(name, "refs/remotes/") ? 13 :
 217                 0);
 218 }
 219
 220 #define SUMMARY_WIDTH (2 * DEFAULT_ABBREV + 3)
 221
 222 static void print_ref_status(char flag, const char *summary, struct ref *to, struct ref *from, const char *msg)
 223 {
 224         fprintf(stderr, " %c %-*s ", flag, SUMMARY_WIDTH, summary);
 225         if (from)
 226                 fprintf(stderr, "%s -> %s", prettify_ref(from), prettify_ref(to));
 227         else
 228                 fputs(prettify_ref(to), stderr);
 229         if (msg) {
 230                 fputs(" (", stderr);
 231                 fputs(msg, stderr);
 232                 fputc(')', stderr);
 233         }
 234         fputc('\n', stderr);
 235 }
 236
 237 static const char *status_abbrev(unsigned char sha1[20])
 238 {
 239         const char *abbrev;
 240         abbrev = find_unique_abbrev(sha1, DEFAULT_ABBREV);
 241         return abbrev ? abbrev : sha1_to_hex(sha1);
 242 }
 243
 244 static void print_ok_ref_status(struct ref *ref)
 245 {
 246         if (ref->deletion)
 247                 print_ref_status('-', "[deleted]", ref, NULL, NULL);
 248         else if (is_null_sha1(ref->old_sha1))
 249                 print_ref_status('*',
 250                         (!prefixcmp(ref->name, "refs/tags/") ? "[new tag]" :
 251                           "[new branch]"),
 252                         ref, ref->peer_ref, NULL);
 253         else {
 254                 char quickref[84];
 255                 char type;
 256                 const char *msg;
 257
 258                 strcpy(quickref, status_abbrev(ref->old_sha1));
 259                 if (ref->nonfastforward) {
 260                         strcat(quickref, "...");
 261                         type = '+';
 262                         msg = "forced update";
 263                 } else {
 264                         strcat(quickref, "..");
 265                         type = ' ';
 266                         msg = NULL;
 267                 }
 268                 strcat(quickref, status_abbrev(ref->new_sha1));
 269
 270                 print_ref_status(type, quickref, ref, ref->peer_ref, msg);
 271         }
 272 }
 273
 274 static void print_push_status(const char *dest, struct ref *refs)
 275 {
 276         struct ref *ref;
 277         int shown_dest = 0;
 278
 279         for (ref = refs; ref; ref = ref->next) {
 280                 if (!ref->status)
 281                         continue;
 282                 if (ref->status == REF_STATUS_UPTODATE && !args.verbose)
 283                         continue;
 284
 285                 if (!shown_dest) {
 286                         fprintf(stderr, "To %s\n", dest);
 287                         shown_dest = 1;
 288                 }
 289
 290                 switch(ref->status) {
 291                 case REF_STATUS_NONE:
 292                         print_ref_status('X', "[no match]", ref, NULL, NULL);
 293                         break;
 294                 case REF_STATUS_REJECT_NODELETE:
 295                         print_ref_status('!', "[rejected]", ref, NULL,
 296                                         "remote does not support deleting refs");
 297                         break;
 298                 case REF_STATUS_UPTODATE:
 299                         print_ref_status('=', "[up to date]", ref,
 300                                         ref->peer_ref, NULL);
 301                         break;
 302                 case REF_STATUS_REJECT_NONFASTFORWARD:
 303                         print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 304                                         "non-fast forward");
 305                         break;
 306                 case REF_STATUS_OK:
 307                         print_ok_ref_status(ref);
 308                         break;
 309                 }
 310         }
 311 }
 312
 313 static int do_send_pack(int in, int out, struct remote *remote, const char *dest, int nr_refspec, const char **refspec)
 314 {
 315         struct ref *ref;
 316         int new_refs;
 317         int ask_for_status_report = 0;
 318         int allow_deleting_refs = 0;
 319         int expect_status_report = 0;
 320         int flags = MATCH_REFS_NONE;
 321
 322         if (args.send_all)
 323                 flags |= MATCH_REFS_ALL;
 324         if (args.send_mirror)
 325                 flags |= MATCH_REFS_MIRROR;
 326
 327         /* No funny business with the matcher */
 328         remote_tail = get_remote_heads(in, &remote_refs, 0, NULL, REF_NORMAL);
 329         get_local_heads();
 330
 331         /* Does the other end support the reporting? */
 332         if (server_supports("report-status"))
 333                 ask_for_status_report = 1;
 334         if (server_supports("delete-refs"))
 335                 allow_deleting_refs = 1;
 336
 337         /* match them up */
 338         if (!remote_tail)
 339                 remote_tail = &remote_refs;
 340         if (match_refs(local_refs, remote_refs, &remote_tail,
 341                                                nr_refspec, refspec, flags))
 342                 return -1;
 343
 344         if (!remote_refs) {
 345                 fprintf(stderr, "No refs in common and none specified; doing nothing.\n"
 346                         "Perhaps you should specify a branch such as 'master'.\n");
 347                 return 0;
 348         }
 349
 350         /*
 351          * Finally, tell the other end!
 352          */
 353         new_refs = 0;
 354         for (ref = remote_refs; ref; ref = ref->next) {
 355                 const unsigned char *new_sha1;
 356
 357                 if (!ref->peer_ref) {
 358                         if (!args.send_mirror)
 359                                 continue;
 360                         new_sha1 = null_sha1;
 361                 }
 362                 else
 363                         new_sha1 = ref->peer_ref->new_sha1;
 364
 365
 366                 ref->deletion = is_null_sha1(new_sha1);
 367                 if (ref->deletion && !allow_deleting_refs) {
 368                         ref->status = REF_STATUS_REJECT_NODELETE;
 369                         continue;
 370                 }
 371                 if (!ref->deletion &&
 372                     !hashcmp(ref->old_sha1, new_sha1)) {
 373                         ref->status = REF_STATUS_UPTODATE;
 374                         continue;
 375                 }
 376
 377                 /* This part determines what can overwrite what.
 378                  * The rules are:
 379                  *
 380                  * (0) you can always use --force or +A:B notation to
 381                  *     selectively force individual ref pairs.
 382                  *
 383                  * (1) if the old thing does not exist, it is OK.
 384                  *
 385                  * (2) if you do not have the old thing, you are not allowed
 386                  *     to overwrite it; you would not know what you are losing
 387                  *     otherwise.
 388                  *
 389                  * (3) if both new and old are commit-ish, and new is a
 390                  *     descendant of old, it is OK.
 391                  *
 392                  * (4) regardless of all of the above, removing :B is
 393                  *     always allowed.
 394                  */
 395
 396                 ref->nonfastforward =
 397                     !ref->deletion &&
 398                     !is_null_sha1(ref->old_sha1) &&
 399                     (!has_sha1_file(ref->old_sha1)
 400                       || !ref_newer(new_sha1, ref->old_sha1));
 401
 402                 if (ref->nonfastforward && !ref->force && !args.force_update) {
 403                         ref->status = REF_STATUS_REJECT_NONFASTFORWARD;
 404                         continue;
 405                 }
 406
 407                 hashcpy(ref->new_sha1, new_sha1);
 408                 if (!ref->deletion)
 409                         new_refs++;
 410                 ref->status = REF_STATUS_OK;
 411
 412                 if (!args.dry_run) {
 413                         char *old_hex = sha1_to_hex(ref->old_sha1);
 414                         char *new_hex = sha1_to_hex(ref->new_sha1);
 415
 416                         if (ask_for_status_report) {
 417                                 packet_write(out, "%s %s %s%c%s",
 418                                         old_hex, new_hex, ref->name, 0,
 419                                         "report-status");
 420                                 ask_for_status_report = 0;
 421                                 expect_status_report = 1;
 422                         }
 423                         else
 424                                 packet_write(out, "%s %s %s",
 425                                         old_hex, new_hex, ref->name);
 426                 }
 427         }
 428
 429         packet_flush(out);
 430         if (new_refs && !args.dry_run) {
 431                 if (pack_objects(out, remote_refs) < 0) {
 432                         close(out);
 433                         return -1;
 434                 }
 435         }
 436         close(out);
 437
 438         print_push_status(dest, remote_refs);
 439
 440         if (expect_status_report) {
 441                 if (receive_status(in))
 442                         return -1;
 443         }
 444
 445         if (!args.dry_run && remote) {
 446                 for (ref = remote_refs; ref; ref = ref->next)
 447                         if (!is_null_sha1(ref->new_sha1))
 448                                 update_tracking_ref(remote, ref);
 449         }
 450
 451         if (!new_refs)
 452                 fprintf(stderr, "Everything up-to-date\n");
 453         for (ref = remote_refs; ref; ref = ref->next) {
 454                 switch (ref->status) {
 455                 case REF_STATUS_NONE:
 456                 case REF_STATUS_UPTODATE:
 457                 case REF_STATUS_OK:
 458                         break;
 459                 default:
 460                         return -1;
 461                 }
 462         }
 463         return 0;
 464 }
 465
 466 static void verify_remote_names(int nr_heads, const char **heads)
 467 {
 468         int i;
 469
 470         for (i = 0; i < nr_heads; i++) {
 471                 const char *remote = strchr(heads[i], ':');
 472
 473                 remote = remote ? (remote + 1) : heads[i];
 474                 switch (check_ref_format(remote)) {
 475                 case 0: /* ok */
 476                 case -2: /* ok but a single level -- that is fine for
 477                           * a match pattern.
 478                           */
 479                 case -3: /* ok but ends with a pattern-match character */
 480                         continue;
 481                 }
 482                 die("remote part of refspec is not a valid name in %s",
 483                     heads[i]);
 484         }
 485 }
 486
 487 int cmd_send_pack(int argc, const char **argv, const char *prefix)
 488 {
 489         int i, nr_heads = 0;
 490         const char **heads = NULL;
 491         const char *remote_name = NULL;
 492         struct remote *remote = NULL;
 493         const char *dest = NULL;
 494
 495         argv++;
 496         for (i = 1; i < argc; i++, argv++) {
 497                 const char *arg = *argv;
 498
 499                 if (*arg == '-') {
 500                         if (!prefixcmp(arg, "--receive-pack=")) {
 501                                 args.receivepack = arg + 15;
 502                                 continue;
 503                         }
 504                         if (!prefixcmp(arg, "--exec=")) {
 505                                 args.receivepack = arg + 7;
 506                                 continue;
 507                         }
 508                         if (!prefixcmp(arg, "--remote=")) {
 509                                 remote_name = arg + 9;
 510                                 continue;
 511                         }
 512                         if (!strcmp(arg, "--all")) {
 513                                 args.send_all = 1;
 514                                 continue;
 515                         }
 516                         if (!strcmp(arg, "--dry-run")) {
 517                                 args.dry_run = 1;
 518                                 continue;
 519                         }
 520                         if (!strcmp(arg, "--mirror")) {
 521                                 args.send_mirror = 1;
 522                                 continue;
 523                         }
 524                         if (!strcmp(arg, "--force")) {
 525                                 args.force_update = 1;
 526                                 continue;
 527                         }
 528                         if (!strcmp(arg, "--verbose")) {
 529                                 args.verbose = 1;
 530                                 continue;
 531                         }
 532                         if (!strcmp(arg, "--thin")) {
 533                                 args.use_thin_pack = 1;
 534                                 continue;
 535                         }
 536                         usage(send_pack_usage);
 537                 }
 538                 if (!dest) {
 539                         dest = arg;
 540                         continue;
 541                 }
 542                 heads = (const char **) argv;
 543                 nr_heads = argc - i;
 544                 break;
 545         }
 546         if (!dest)
 547                 usage(send_pack_usage);
 548         /*
 549          * --all and --mirror are incompatible; neither makes sense
 550          * with any refspecs.
 551          */
 552         if ((heads && (args.send_all || args.send_mirror)) ||
 553                                         (args.send_all && args.send_mirror))
 554                 usage(send_pack_usage);
 555
 556         if (remote_name) {
 557                 remote = remote_get(remote_name);
 558                 if (!remote_has_url(remote, dest)) {
 559                         die("Destination %s is not a uri for %s",
 560                             dest, remote_name);
 561                 }
 562         }
 563
 564         return send_pack(&args, dest, remote, nr_heads, heads);
 565 }
 566
 567 int send_pack(struct send_pack_args *my_args,
 568               const char *dest, struct remote *remote,
 569               int nr_heads, const char **heads)
 570 {
 571         int fd[2], ret;
 572         struct child_process *conn;
 573
 574         memcpy(&args, my_args, sizeof(args));
 575
 576         verify_remote_names(nr_heads, heads);
 577
 578         conn = git_connect(fd, dest, args.receivepack, args.verbose ? CONNECT_VERBOSE : 0);
 579         ret = do_send_pack(fd[0], fd[1], remote, dest, nr_heads, heads);
 580         close(fd[0]);
 581         close(fd[1]);
 582         ret |= finish_connect(conn);
 583         return !!ret;
 584 }