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 int send_pack(int in, int out, struct remote *remote, int nr_refspec, char **refspec)
 182 {
 183         struct ref *ref;
 184         int new_refs;
 185         int ret = 0;
 186         int ask_for_status_report = 0;
 187         int allow_deleting_refs = 0;
 188         int expect_status_report = 0;
 189
 190         /* No funny business with the matcher */
 191         remote_tail = get_remote_heads(in, &remote_refs, 0, NULL, REF_NORMAL);
 192         get_local_heads();
 193
 194         /* Does the other end support the reporting? */
 195         if (server_supports("report-status"))
 196                 ask_for_status_report = 1;
 197         if (server_supports("delete-refs"))
 198                 allow_deleting_refs = 1;
 199
 200         /* match them up */
 201         if (!remote_tail)
 202                 remote_tail = &remote_refs;
 203         if (match_refs(local_refs, remote_refs, &remote_tail,
 204                        nr_refspec, refspec, send_all))
 205                 return -1;
 206
 207         if (!remote_refs) {
 208                 fprintf(stderr, "No refs in common and none specified; doing nothing.\n");
 209                 return 0;
 210         }
 211
 212         /*
 213          * Finally, tell the other end!
 214          */
 215         new_refs = 0;
 216         for (ref = remote_refs; ref; ref = ref->next) {
 217                 char old_hex[60], *new_hex;
 218                 int will_delete_ref;
 219
 220                 if (!ref->peer_ref)
 221                         continue;
 222
 223
 224                 will_delete_ref = is_null_sha1(ref->peer_ref->new_sha1);
 225                 if (will_delete_ref && !allow_deleting_refs) {
 226                         error("remote does not support deleting refs");
 227                         ret = -2;
 228                         continue;
 229                 }
 230                 if (!will_delete_ref &&
 231                     !hashcmp(ref->old_sha1, ref->peer_ref->new_sha1)) {
 232                         if (verbose)
 233                                 fprintf(stderr, "'%s': up-to-date\n", ref->name);
 234                         continue;
 235                 }
 236
 237                 /* This part determines what can overwrite what.
 238                  * The rules are:
 239                  *
 240                  * (0) you can always use --force or +A:B notation to
 241                  *     selectively force individual ref pairs.
 242                  *
 243                  * (1) if the old thing does not exist, it is OK.
 244                  *
 245                  * (2) if you do not have the old thing, you are not allowed
 246                  *     to overwrite it; you would not know what you are losing
 247                  *     otherwise.
 248                  *
 249                  * (3) if both new and old are commit-ish, and new is a
 250                  *     descendant of old, it is OK.
 251                  *
 252                  * (4) regardless of all of the above, removing :B is
 253                  *     always allowed.
 254                  */
 255
 256                 if (!force_update &&
 257                     !will_delete_ref &&
 258                     !is_null_sha1(ref->old_sha1) &&
 259                     !ref->force) {
 260                         if (!has_sha1_file(ref->old_sha1) ||
 261                             !ref_newer(ref->peer_ref->new_sha1,
 262                                        ref->old_sha1)) {
 263                                 /* We do not have the remote ref, or
 264                                  * we know that the remote ref is not
 265                                  * an ancestor of what we are trying to
 266                                  * push.  Either way this can be losing
 267                                  * commits at the remote end and likely
 268                                  * we were not up to date to begin with.
 269                                  */
 270                                 error("remote '%s' is not a strict "
 271                                       "subset of local ref '%s'. "
 272                                       "maybe you are not up-to-date and "
 273                                       "need to pull first?",
 274                                       ref->name,
 275                                       ref->peer_ref->name);
 276                                 ret = -2;
 277                                 continue;
 278                         }
 279                 }
 280                 hashcpy(ref->new_sha1, ref->peer_ref->new_sha1);
 281                 if (!will_delete_ref)
 282                         new_refs++;
 283                 strcpy(old_hex, sha1_to_hex(ref->old_sha1));
 284                 new_hex = sha1_to_hex(ref->new_sha1);
 285
 286                 if (!dry_run) {
 287                         if (ask_for_status_report) {
 288                                 packet_write(out, "%s %s %s%c%s",
 289                                         old_hex, new_hex, ref->name, 0,
 290                                         "report-status");
 291                                 ask_for_status_report = 0;
 292                                 expect_status_report = 1;
 293                         }
 294                         else
 295                                 packet_write(out, "%s %s %s",
 296                                         old_hex, new_hex, ref->name);
 297                 }
 298                 if (will_delete_ref)
 299                         fprintf(stderr, "deleting '%s'\n", ref->name);
 300                 else {
 301                         fprintf(stderr, "updating '%s'", ref->name);
 302                         if (strcmp(ref->name, ref->peer_ref->name))
 303                                 fprintf(stderr, " using '%s'",
 304                                         ref->peer_ref->name);
 305                         fprintf(stderr, "\n  from %s\n  to   %s\n",
 306                                 old_hex, new_hex);
 307                 }
 308                 if (remote && !dry_run) {
 309                         struct refspec rs;
 310                         rs.src = ref->name;
 311                         rs.dst = NULL;
 312                         if (!remote_find_tracking(remote, &rs)) {
 313                                 fprintf(stderr, " Also local %s\n", rs.dst);
 314                                 if (will_delete_ref) {
 315                                         if (delete_ref(rs.dst, NULL)) {
 316                                                 error("Failed to delete");
 317                                         }
 318                                 } else
 319                                         update_ref("update by push", rs.dst,
 320                                                 ref->new_sha1, NULL, 0, 0);
 321                                 free(rs.dst);
 322                         }
 323                 }
 324         }
 325
 326         packet_flush(out);
 327         if (new_refs && !dry_run)
 328                 ret = pack_objects(out, remote_refs);
 329         close(out);
 330
 331         if (expect_status_report) {
 332                 if (receive_status(in))
 333                         ret = -4;
 334         }
 335
 336         if (!new_refs && ret == 0)
 337                 fprintf(stderr, "Everything up-to-date\n");
 338         return ret;
 339 }
 340
 341 static void verify_remote_names(int nr_heads, char **heads)
 342 {
 343         int i;
 344
 345         for (i = 0; i < nr_heads; i++) {
 346                 const char *remote = strchr(heads[i], ':');
 347
 348                 remote = remote ? (remote + 1) : heads[i];
 349                 switch (check_ref_format(remote)) {
 350                 case 0: /* ok */
 351                 case -2: /* ok but a single level -- that is fine for
 352                           * a match pattern.
 353                           */
 354                 case -3: /* ok but ends with a pattern-match character */
 355                         continue;
 356                 }
 357                 die("remote part of refspec is not a valid name in %s",
 358                     heads[i]);
 359         }
 360 }
 361
 362 int main(int argc, char **argv)
 363 {
 364         int i, nr_heads = 0;
 365         char *dest = NULL;
 366         char **heads = NULL;
 367         int fd[2], ret;
 368         struct child_process *conn;
 369         char *remote_name = NULL;
 370         struct remote *remote = NULL;
 371
 372         setup_git_directory();
 373         git_config(git_default_config);
 374
 375         argv++;
 376         for (i = 1; i < argc; i++, argv++) {
 377                 char *arg = *argv;
 378
 379                 if (*arg == '-') {
 380                         if (!prefixcmp(arg, "--receive-pack=")) {
 381                                 receivepack = arg + 15;
 382                                 continue;
 383                         }
 384                         if (!prefixcmp(arg, "--exec=")) {
 385                                 receivepack = arg + 7;
 386                                 continue;
 387                         }
 388                         if (!prefixcmp(arg, "--remote=")) {
 389                                 remote_name = arg + 9;
 390                                 continue;
 391                         }
 392                         if (!strcmp(arg, "--all")) {
 393                                 send_all = 1;
 394                                 continue;
 395                         }
 396                         if (!strcmp(arg, "--dry-run")) {
 397                                 dry_run = 1;
 398                                 continue;
 399                         }
 400                         if (!strcmp(arg, "--force")) {
 401                                 force_update = 1;
 402                                 continue;
 403                         }
 404                         if (!strcmp(arg, "--verbose")) {
 405                                 verbose = 1;
 406                                 continue;
 407                         }
 408                         if (!strcmp(arg, "--thin")) {
 409                                 use_thin_pack = 1;
 410                                 continue;
 411                         }
 412                         usage(send_pack_usage);
 413                 }
 414                 if (!dest) {
 415                         dest = arg;
 416                         continue;
 417                 }
 418                 heads = argv;
 419                 nr_heads = argc - i;
 420                 break;
 421         }
 422         if (!dest)
 423                 usage(send_pack_usage);
 424         if (heads && send_all)
 425                 usage(send_pack_usage);
 426         verify_remote_names(nr_heads, heads);
 427
 428         if (remote_name) {
 429                 remote = remote_get(remote_name);
 430                 if (!remote_has_url(remote, dest)) {
 431                         die("Destination %s is not a uri for %s",
 432                             dest, remote_name);
 433                 }
 434         }
 435
 436         conn = git_connect(fd, dest, receivepack, verbose ? CONNECT_VERBOSE : 0);
 437         ret = send_pack(fd[0], fd[1], remote, nr_heads, heads);
 438         close(fd[0]);
 439         close(fd[1]);
 440         ret |= finish_connect(conn);
 441         return !!ret;
 442 }