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
   9 static const char send_pack_usage[] =
  10 "git-send-pack [--all] [--dry-run] [--force] [--receive-pack=<git-receive-pack>] [--verbose] [--thin] [<host>:]<directory> [<ref>...]\n"
  11 "  --all and explicit <ref> specification are mutually exclusive.";
  12 static const char *receivepack = "git-receive-pack";
  13 static int verbose;
  14 static int send_all;
  15 static int force_update;
  16 static int use_thin_pack;
  17 static int dry_run;
  18
  19 /*
  20  * Make a pack stream and spit it out into file descriptor fd
  21  */
  22 static int pack_objects(int fd, struct ref *refs)
  23 {
  24         /*
  25          * The child becomes pack-objects --revs; we feed
  26          * the revision parameters to it via its stdin and
  27          * let its stdout go back to the other end.
  28          */
  29         const char *args[] = {
  30                 "pack-objects",
  31                 "--all-progress",
  32                 "--revs",
  33                 "--stdout",
  34                 NULL,
  35                 NULL,
  36         };
  37         struct child_process po;
  38
  39         if (use_thin_pack)
  40                 args[4] = "--thin";
  41         memset(&po, 0, sizeof(po));
  42         po.argv = args;
  43         po.in = -1;
  44         po.out = fd;
  45         po.git_cmd = 1;
  46         if (start_command(&po))
  47                 die("git-pack-objects failed (%s)", strerror(errno));
  48
  49         /*
  50          * We feed the pack-objects we just spawned with revision
  51          * parameters by writing to the pipe.
  52          */
  53         while (refs) {
  54                 char buf[42];
  55
  56                 if (!is_null_sha1(refs->old_sha1) &&
  57                     has_sha1_file(refs->old_sha1)) {
  58                         memcpy(buf + 1, sha1_to_hex(refs->old_sha1), 40);
  59                         buf[0] = '^';
  60                         buf[41] = '\n';
  61                         if (!write_or_whine(po.in, buf, 42,
  62                                                 "send-pack: send refs"))
  63                                 break;
  64                 }
  65                 if (!is_null_sha1(refs->new_sha1)) {
  66                         memcpy(buf, sha1_to_hex(refs->new_sha1), 40);
  67                         buf[40] = '\n';
  68                         if (!write_or_whine(po.in, buf, 41,
  69                                                 "send-pack: send refs"))
  70                                 break;
  71                 }
  72                 refs = refs->next;
  73         }
  74
  75         if (finish_command(&po))
  76                 return error("pack-objects died with strange error");
  77         return 0;
  78 }
  79
  80 static void unmark_and_free(struct commit_list *list, unsigned int mark)
  81 {
  82         while (list) {
  83                 struct commit_list *temp = list;
  84                 temp->item->object.flags &= ~mark;
  85                 list = temp->next;
  86                 free(temp);
  87         }
  88 }
  89
  90 static int ref_newer(const unsigned char *new_sha1,
  91                      const unsigned char *old_sha1)
  92 {
  93         struct object *o;
  94         struct commit *old, *new;
  95         struct commit_list *list, *used;
  96         int found = 0;
  97
  98         /* Both new and old must be commit-ish and new is descendant of
  99          * old.  Otherwise we require --force.
 100          */
 101         o = deref_tag(parse_object(old_sha1), NULL, 0);
 102         if (!o || o->type != OBJ_COMMIT)
 103                 return 0;
 104         old = (struct commit *) o;
 105
 106         o = deref_tag(parse_object(new_sha1), NULL, 0);
 107         if (!o || o->type != OBJ_COMMIT)
 108                 return 0;
 109         new = (struct commit *) o;
 110
 111         if (parse_commit(new) < 0)
 112                 return 0;
 113
 114         used = list = NULL;
 115         commit_list_insert(new, &list);
 116         while (list) {
 117                 new = pop_most_recent_commit(&list, 1);
 118                 commit_list_insert(new, &used);
 119                 if (new == old) {
 120                         found = 1;
 121                         break;
 122                 }
 123         }
 124         unmark_and_free(list, 1);
 125         unmark_and_free(used, 1);
 126         return found;
 127 }
 128
 129 static struct ref *local_refs, **local_tail;
 130 static struct ref *remote_refs, **remote_tail;
 131
 132 static int one_local_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
 133 {
 134         struct ref *ref;
 135         int len = strlen(refname) + 1;
 136         ref = xcalloc(1, sizeof(*ref) + len);
 137         hashcpy(ref->new_sha1, sha1);
 138         memcpy(ref->name, refname, len);
 139         *local_tail = ref;
 140         local_tail = &ref->next;
 141         return 0;
 142 }
 143
 144 static void get_local_heads(void)
 145 {
 146         local_tail = &local_refs;
 147         for_each_ref(one_local_ref, NULL);
 148 }
 149
 150 static int receive_status(int in)
 151 {
 152         char line[1000];
 153         int ret = 0;
 154         int len = packet_read_line(in, line, sizeof(line));
 155         if (len < 10 || memcmp(line, "unpack ", 7)) {
 156                 fprintf(stderr, "did not receive status back\n");
 157                 return -1;
 158         }
 159         if (memcmp(line, "unpack ok\n", 10)) {
 160                 fputs(line, stderr);
 161                 ret = -1;
 162         }
 163         while (1) {
 164                 len = packet_read_line(in, line, sizeof(line));
 165                 if (!len)
 166                         break;
 167                 if (len < 3 ||
 168                     (memcmp(line, "ok", 2) && memcmp(line, "ng", 2))) {
 169                         fprintf(stderr, "protocol error: %s\n", line);
 170                         ret = -1;
 171                         break;
 172                 }
 173                 if (!memcmp(line, "ok", 2))
 174                         continue;
 175                 fputs(line, stderr);
 176                 ret = -1;
 177         }
 178         return ret;
 179 }
 180
 181 static void update_tracking_ref(struct remote *remote, struct ref *ref)
 182 {
 183         struct refspec rs;
 184         int will_delete_ref;
 185
 186         rs.src = ref->name;
 187         rs.dst = NULL;
 188
 189         if (!ref->peer_ref)
 190                 return;
 191
 192         will_delete_ref = is_null_sha1(ref->peer_ref->new_sha1);
 193
 194         if (!will_delete_ref &&
 195                         !hashcmp(ref->old_sha1, ref->peer_ref->new_sha1))
 196                 return;
 197
 198         if (!remote_find_tracking(remote, &rs)) {
 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 int send_pack(int in, int out, struct remote *remote, int nr_refspec, char **refspec)
 211 {
 212         struct ref *ref;
 213         int new_refs;
 214         int ret = 0;
 215         int ask_for_status_report = 0;
 216         int allow_deleting_refs = 0;
 217         int expect_status_report = 0;
 218
 219         /* No funny business with the matcher */
 220         remote_tail = get_remote_heads(in, &remote_refs, 0, NULL, REF_NORMAL);
 221         get_local_heads();
 222
 223         /* Does the other end support the reporting? */
 224         if (server_supports("report-status"))
 225                 ask_for_status_report = 1;
 226         if (server_supports("delete-refs"))
 227                 allow_deleting_refs = 1;
 228
 229         /* match them up */
 230         if (!remote_tail)
 231                 remote_tail = &remote_refs;
 232         if (match_refs(local_refs, remote_refs, &remote_tail,
 233                        nr_refspec, refspec, send_all))
 234                 return -1;
 235
 236         if (!remote_refs) {
 237                 fprintf(stderr, "No refs in common and none specified; doing nothing.\n"
 238                         "Perhaps you should specify a branch such as 'master'.\n");
 239                 return 0;
 240         }
 241
 242         /*
 243          * Finally, tell the other end!
 244          */
 245         new_refs = 0;
 246         for (ref = remote_refs; ref; ref = ref->next) {
 247                 char old_hex[60], *new_hex;
 248                 int will_delete_ref;
 249
 250                 if (!ref->peer_ref)
 251                         continue;
 252
 253
 254                 will_delete_ref = is_null_sha1(ref->peer_ref->new_sha1);
 255                 if (will_delete_ref && !allow_deleting_refs) {
 256                         error("remote does not support deleting refs");
 257                         ret = -2;
 258                         continue;
 259                 }
 260                 if (!will_delete_ref &&
 261                     !hashcmp(ref->old_sha1, ref->peer_ref->new_sha1)) {
 262                         if (verbose)
 263                                 fprintf(stderr, "'%s': up-to-date\n", ref->name);
 264                         continue;
 265                 }
 266
 267                 /* This part determines what can overwrite what.
 268                  * The rules are:
 269                  *
 270                  * (0) you can always use --force or +A:B notation to
 271                  *     selectively force individual ref pairs.
 272                  *
 273                  * (1) if the old thing does not exist, it is OK.
 274                  *
 275                  * (2) if you do not have the old thing, you are not allowed
 276                  *     to overwrite it; you would not know what you are losing
 277                  *     otherwise.
 278                  *
 279                  * (3) if both new and old are commit-ish, and new is a
 280                  *     descendant of old, it is OK.
 281                  *
 282                  * (4) regardless of all of the above, removing :B is
 283                  *     always allowed.
 284                  */
 285
 286                 if (!force_update &&
 287                     !will_delete_ref &&
 288                     !is_null_sha1(ref->old_sha1) &&
 289                     !ref->force) {
 290                         if (!has_sha1_file(ref->old_sha1) ||
 291                             !ref_newer(ref->peer_ref->new_sha1,
 292                                        ref->old_sha1)) {
 293                                 /* We do not have the remote ref, or
 294                                  * we know that the remote ref is not
 295                                  * an ancestor of what we are trying to
 296                                  * push.  Either way this can be losing
 297                                  * commits at the remote end and likely
 298                                  * we were not up to date to begin with.
 299                                  */
 300                                 error("remote '%s' is not a strict "
 301                                       "subset of local ref '%s'. "
 302                                       "maybe you are not up-to-date and "
 303                                       "need to pull first?",
 304                                       ref->name,
 305                                       ref->peer_ref->name);
 306                                 ret = -2;
 307                                 continue;
 308                         }
 309                 }
 310                 hashcpy(ref->new_sha1, ref->peer_ref->new_sha1);
 311                 if (!will_delete_ref)
 312                         new_refs++;
 313                 strcpy(old_hex, sha1_to_hex(ref->old_sha1));
 314                 new_hex = sha1_to_hex(ref->new_sha1);
 315
 316                 if (!dry_run) {
 317                         if (ask_for_status_report) {
 318                                 packet_write(out, "%s %s %s%c%s",
 319                                         old_hex, new_hex, ref->name, 0,
 320                                         "report-status");
 321                                 ask_for_status_report = 0;
 322                                 expect_status_report = 1;
 323                         }
 324                         else
 325                                 packet_write(out, "%s %s %s",
 326                                         old_hex, new_hex, ref->name);
 327                 }
 328                 if (will_delete_ref)
 329                         fprintf(stderr, "deleting '%s'\n", ref->name);
 330                 else {
 331                         fprintf(stderr, "updating '%s'", ref->name);
 332                         if (strcmp(ref->name, ref->peer_ref->name))
 333                                 fprintf(stderr, " using '%s'",
 334                                         ref->peer_ref->name);
 335                         fprintf(stderr, "\n  from %s\n  to   %s\n",
 336                                 old_hex, new_hex);
 337                 }
 338         }
 339
 340         packet_flush(out);
 341         if (new_refs && !dry_run)
 342                 ret = pack_objects(out, remote_refs);
 343         close(out);
 344
 345         if (expect_status_report) {
 346                 if (receive_status(in))
 347                         ret = -4;
 348         }
 349
 350         if (!dry_run && remote && ret == 0) {
 351                 for (ref = remote_refs; ref; ref = ref->next)
 352                         update_tracking_ref(remote, ref);
 353         }
 354
 355         if (!new_refs && ret == 0)
 356                 fprintf(stderr, "Everything up-to-date\n");
 357         return ret;
 358 }
 359
 360 static void verify_remote_names(int nr_heads, char **heads)
 361 {
 362         int i;
 363
 364         for (i = 0; i < nr_heads; i++) {
 365                 const char *remote = strchr(heads[i], ':');
 366
 367                 remote = remote ? (remote + 1) : heads[i];
 368                 switch (check_ref_format(remote)) {
 369                 case 0: /* ok */
 370                 case -2: /* ok but a single level -- that is fine for
 371                           * a match pattern.
 372                           */
 373                 case -3: /* ok but ends with a pattern-match character */
 374                         continue;
 375                 }
 376                 die("remote part of refspec is not a valid name in %s",
 377                     heads[i]);
 378         }
 379 }
 380
 381 int main(int argc, char **argv)
 382 {
 383         int i, nr_heads = 0;
 384         char *dest = NULL;
 385         char **heads = NULL;
 386         int fd[2], ret;
 387         pid_t pid;
 388         char *remote_name = NULL;
 389         struct remote *remote = NULL;
 390
 391         setup_git_directory();
 392         git_config(git_default_config);
 393
 394         argv++;
 395         for (i = 1; i < argc; i++, argv++) {
 396                 char *arg = *argv;
 397
 398                 if (*arg == '-') {
 399                         if (!prefixcmp(arg, "--receive-pack=")) {
 400                                 receivepack = arg + 15;
 401                                 continue;
 402                         }
 403                         if (!prefixcmp(arg, "--exec=")) {
 404                                 receivepack = arg + 7;
 405                                 continue;
 406                         }
 407                         if (!prefixcmp(arg, "--remote=")) {
 408                                 remote_name = arg + 9;
 409                                 continue;
 410                         }
 411                         if (!strcmp(arg, "--all")) {
 412                                 send_all = 1;
 413                                 continue;
 414                         }
 415                         if (!strcmp(arg, "--dry-run")) {
 416                                 dry_run = 1;
 417                                 continue;
 418                         }
 419                         if (!strcmp(arg, "--force")) {
 420                                 force_update = 1;
 421                                 continue;
 422                         }
 423                         if (!strcmp(arg, "--verbose")) {
 424                                 verbose = 1;
 425                                 continue;
 426                         }
 427                         if (!strcmp(arg, "--thin")) {
 428                                 use_thin_pack = 1;
 429                                 continue;
 430                         }
 431                         usage(send_pack_usage);
 432                 }
 433                 if (!dest) {
 434                         dest = arg;
 435                         continue;
 436                 }
 437                 heads = argv;
 438                 nr_heads = argc - i;
 439                 break;
 440         }
 441         if (!dest)
 442                 usage(send_pack_usage);
 443         if (heads && send_all)
 444                 usage(send_pack_usage);
 445         verify_remote_names(nr_heads, heads);
 446
 447         if (remote_name) {
 448                 remote = remote_get(remote_name);
 449                 if (!remote_has_url(remote, dest)) {
 450                         die("Destination %s is not a uri for %s",
 451                             dest, remote_name);
 452                 }
 453         }
 454
 455         pid = git_connect(fd, dest, receivepack, verbose ? CONNECT_VERBOSE : 0);
 456         if (pid < 0)
 457                 return 1;
 458         ret = send_pack(fd[0], fd[1], remote, nr_heads, heads);
 459         close(fd[0]);
 460         close(fd[1]);
 461         ret |= finish_connect(pid);
 462         return !!ret;
 463 }