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