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] [--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                 fprintf(stderr, "updating local tracking ref '%s'\n", rs.dst);
 199                 if (is_null_sha1(ref->peer_ref->new_sha1)) {
 200                         if (delete_ref(rs.dst, NULL))
 201                                 error("Failed to delete");
 202                 } else
 203                         update_ref("update by push", rs.dst,
 204                                         ref->new_sha1, NULL, 0, 0);
 205                 free(rs.dst);
 206         }
 207 }
 208
 209 static const char *prettify_ref(const char *name)
 210 {
 211         return name + (
 212                 !prefixcmp(name, "refs/heads/") ? 11 :
 213                 !prefixcmp(name, "refs/tags/") ? 10 :
 214                 !prefixcmp(name, "refs/remotes/") ? 13 :
 215                 0);
 216 }
 217
 218 #define SUMMARY_WIDTH (2 * DEFAULT_ABBREV + 3)
 219
 220 static int do_send_pack(int in, int out, struct remote *remote, const char *dest, int nr_refspec, const char **refspec)
 221 {
 222         struct ref *ref;
 223         int new_refs;
 224         int ret = 0;
 225         int ask_for_status_report = 0;
 226         int allow_deleting_refs = 0;
 227         int expect_status_report = 0;
 228         int shown_dest = 0;
 229
 230         /* No funny business with the matcher */
 231         remote_tail = get_remote_heads(in, &remote_refs, 0, NULL, REF_NORMAL);
 232         get_local_heads();
 233
 234         /* Does the other end support the reporting? */
 235         if (server_supports("report-status"))
 236                 ask_for_status_report = 1;
 237         if (server_supports("delete-refs"))
 238                 allow_deleting_refs = 1;
 239
 240         /* match them up */
 241         if (!remote_tail)
 242                 remote_tail = &remote_refs;
 243         if (match_refs(local_refs, remote_refs, &remote_tail,
 244                        nr_refspec, refspec, args.send_all))
 245                 return -1;
 246
 247         if (!remote_refs) {
 248                 fprintf(stderr, "No refs in common and none specified; doing nothing.\n"
 249                         "Perhaps you should specify a branch such as 'master'.\n");
 250                 return 0;
 251         }
 252
 253         /*
 254          * Finally, tell the other end!
 255          */
 256         new_refs = 0;
 257         for (ref = remote_refs; ref; ref = ref->next) {
 258                 char old_hex[60], *new_hex;
 259                 int will_delete_ref;
 260                 const char *pretty_ref;
 261                 const char *pretty_peer;
 262
 263                 if (!ref->peer_ref)
 264                         continue;
 265
 266                 if (!shown_dest) {
 267                         fprintf(stderr, "To %s\n", dest);
 268                         shown_dest = 1;
 269                 }
 270
 271                 pretty_ref = prettify_ref(ref->name);
 272                 pretty_peer = prettify_ref(ref->peer_ref->name);
 273
 274                 will_delete_ref = is_null_sha1(ref->peer_ref->new_sha1);
 275                 if (will_delete_ref && !allow_deleting_refs) {
 276                         fprintf(stderr, " ! %-*s %s (remote does not support deleting refs)\n",
 277                                         SUMMARY_WIDTH, "[rejected]", pretty_ref);
 278                         ret = -2;
 279                         continue;
 280                 }
 281                 if (!will_delete_ref &&
 282                     !hashcmp(ref->old_sha1, ref->peer_ref->new_sha1)) {
 283                         if (args.verbose)
 284                                 fprintf(stderr, " = %-*s %s -> %s\n",
 285                                         SUMMARY_WIDTH, "[up to date]",
 286                                         pretty_peer, pretty_ref);
 287                         continue;
 288                 }
 289
 290                 /* This part determines what can overwrite what.
 291                  * The rules are:
 292                  *
 293                  * (0) you can always use --force or +A:B notation to
 294                  *     selectively force individual ref pairs.
 295                  *
 296                  * (1) if the old thing does not exist, it is OK.
 297                  *
 298                  * (2) if you do not have the old thing, you are not allowed
 299                  *     to overwrite it; you would not know what you are losing
 300                  *     otherwise.
 301                  *
 302                  * (3) if both new and old are commit-ish, and new is a
 303                  *     descendant of old, it is OK.
 304                  *
 305                  * (4) regardless of all of the above, removing :B is
 306                  *     always allowed.
 307                  */
 308
 309                 if (!args.force_update &&
 310                     !will_delete_ref &&
 311                     !is_null_sha1(ref->old_sha1) &&
 312                     !ref->force) {
 313                         if (!has_sha1_file(ref->old_sha1) ||
 314                             !ref_newer(ref->peer_ref->new_sha1,
 315                                        ref->old_sha1)) {
 316                                 /* We do not have the remote ref, or
 317                                  * we know that the remote ref is not
 318                                  * an ancestor of what we are trying to
 319                                  * push.  Either way this can be losing
 320                                  * commits at the remote end and likely
 321                                  * we were not up to date to begin with.
 322                                  */
 323                                 fprintf(stderr, " ! %-*s %s -> %s (non-fast forward)\n",
 324                                                 SUMMARY_WIDTH, "[rejected]",
 325                                                 pretty_peer, pretty_ref);
 326                                 ret = -2;
 327                                 continue;
 328                         }
 329                 }
 330                 hashcpy(ref->new_sha1, ref->peer_ref->new_sha1);
 331                 if (!will_delete_ref)
 332                         new_refs++;
 333                 strcpy(old_hex, sha1_to_hex(ref->old_sha1));
 334                 new_hex = sha1_to_hex(ref->new_sha1);
 335
 336                 if (!args.dry_run) {
 337                         if (ask_for_status_report) {
 338                                 packet_write(out, "%s %s %s%c%s",
 339                                         old_hex, new_hex, ref->name, 0,
 340                                         "report-status");
 341                                 ask_for_status_report = 0;
 342                                 expect_status_report = 1;
 343                         }
 344                         else
 345                                 packet_write(out, "%s %s %s",
 346                                         old_hex, new_hex, ref->name);
 347                 }
 348                 if (will_delete_ref)
 349                         fprintf(stderr, " - %-*s %s\n",
 350                                 SUMMARY_WIDTH, "[deleting]",
 351                                 pretty_ref);
 352                 else if (is_null_sha1(ref->old_sha1)) {
 353                         const char *msg;
 354
 355                         if (!prefixcmp(ref->name, "refs/tags/"))
 356                                 msg = "[new tag]";
 357                         else
 358                                 msg = "[new branch]";
 359                         fprintf(stderr, " * %-*s %s -> %s\n",
 360                                 SUMMARY_WIDTH, msg,
 361                                 pretty_peer, pretty_ref);
 362                 }
 363                 else {
 364                         char quickref[83];
 365                         char type = ' ';
 366                         const char *msg = "";
 367
 368                         strcpy(quickref, find_unique_abbrev(ref->old_sha1, DEFAULT_ABBREV));
 369                         if (ref_newer(ref->peer_ref->new_sha1, ref->old_sha1))
 370                                 strcat(quickref, "..");
 371                         else {
 372                                 strcat(quickref, "...");
 373                                 type = '+';
 374                                 msg = " (forced update)";
 375                         }
 376                         strcat(quickref, find_unique_abbrev(ref->new_sha1, DEFAULT_ABBREV));
 377
 378                         fprintf(stderr, " %c %-*s %s -> %s%s\n",
 379                                 type,
 380                                 SUMMARY_WIDTH, quickref,
 381                                 pretty_peer, pretty_ref,
 382                                 msg);
 383                 }
 384         }
 385
 386         packet_flush(out);
 387         if (new_refs && !args.dry_run)
 388                 ret = pack_objects(out, remote_refs);
 389         close(out);
 390
 391         if (expect_status_report) {
 392                 if (receive_status(in))
 393                         ret = -4;
 394         }
 395
 396         if (!args.dry_run && remote && ret == 0) {
 397                 for (ref = remote_refs; ref; ref = ref->next)
 398                         update_tracking_ref(remote, ref);
 399         }
 400
 401         if (!new_refs && ret == 0)
 402                 fprintf(stderr, "Everything up-to-date\n");
 403         return ret;
 404 }
 405
 406 static void verify_remote_names(int nr_heads, const char **heads)
 407 {
 408         int i;
 409
 410         for (i = 0; i < nr_heads; i++) {
 411                 const char *remote = strchr(heads[i], ':');
 412
 413                 remote = remote ? (remote + 1) : heads[i];
 414                 switch (check_ref_format(remote)) {
 415                 case 0: /* ok */
 416                 case -2: /* ok but a single level -- that is fine for
 417                           * a match pattern.
 418                           */
 419                 case -3: /* ok but ends with a pattern-match character */
 420                         continue;
 421                 }
 422                 die("remote part of refspec is not a valid name in %s",
 423                     heads[i]);
 424         }
 425 }
 426
 427 int cmd_send_pack(int argc, const char **argv, const char *prefix)
 428 {
 429         int i, nr_heads = 0;
 430         const char **heads = NULL;
 431         const char *remote_name = NULL;
 432         struct remote *remote = NULL;
 433         const char *dest = NULL;
 434
 435         argv++;
 436         for (i = 1; i < argc; i++, argv++) {
 437                 const char *arg = *argv;
 438
 439                 if (*arg == '-') {
 440                         if (!prefixcmp(arg, "--receive-pack=")) {
 441                                 args.receivepack = arg + 15;
 442                                 continue;
 443                         }
 444                         if (!prefixcmp(arg, "--exec=")) {
 445                                 args.receivepack = arg + 7;
 446                                 continue;
 447                         }
 448                         if (!prefixcmp(arg, "--remote=")) {
 449                                 remote_name = arg + 9;
 450                                 continue;
 451                         }
 452                         if (!strcmp(arg, "--all")) {
 453                                 args.send_all = 1;
 454                                 continue;
 455                         }
 456                         if (!strcmp(arg, "--dry-run")) {
 457                                 args.dry_run = 1;
 458                                 continue;
 459                         }
 460                         if (!strcmp(arg, "--force")) {
 461                                 args.force_update = 1;
 462                                 continue;
 463                         }
 464                         if (!strcmp(arg, "--verbose")) {
 465                                 args.verbose = 1;
 466                                 continue;
 467                         }
 468                         if (!strcmp(arg, "--thin")) {
 469                                 args.use_thin_pack = 1;
 470                                 continue;
 471                         }
 472                         usage(send_pack_usage);
 473                 }
 474                 if (!dest) {
 475                         dest = arg;
 476                         continue;
 477                 }
 478                 heads = (const char **) argv;
 479                 nr_heads = argc - i;
 480                 break;
 481         }
 482         if (!dest)
 483                 usage(send_pack_usage);
 484         if (heads && args.send_all)
 485                 usage(send_pack_usage);
 486
 487         if (remote_name) {
 488                 remote = remote_get(remote_name);
 489                 if (!remote_has_url(remote, dest)) {
 490                         die("Destination %s is not a uri for %s",
 491                             dest, remote_name);
 492                 }
 493         }
 494
 495         return send_pack(&args, dest, remote, nr_heads, heads);
 496 }
 497
 498 int send_pack(struct send_pack_args *my_args,
 499               const char *dest, struct remote *remote,
 500               int nr_heads, const char **heads)
 501 {
 502         int fd[2], ret;
 503         struct child_process *conn;
 504
 505         memcpy(&args, my_args, sizeof(args));
 506
 507         verify_remote_names(nr_heads, heads);
 508
 509         conn = git_connect(fd, dest, args.receivepack, args.verbose ? CONNECT_VERBOSE : 0);
 510         ret = do_send_pack(fd[0], fd[1], remote, dest, nr_heads, heads);
 511         close(fd[0]);
 512         close(fd[1]);
 513         ret |= finish_connect(conn);
 514         return !!ret;
 515 }