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
 184         if (ref->status != REF_STATUS_OK)
 185                 return;
 186
 187         rs.src = ref->name;
 188         rs.dst = NULL;
 189
 190         if (!remote_find_tracking(remote, &rs)) {
 191                 if (args.verbose)
 192                         fprintf(stderr, "updating local tracking ref '%s'\n", rs.dst);
 193                 if (ref->deletion) {
 194                         if (delete_ref(rs.dst, NULL))
 195                                 error("Failed to delete");
 196                 } else
 197                         update_ref("update by push", rs.dst,
 198                                         ref->new_sha1, NULL, 0, 0);
 199                 free(rs.dst);
 200         }
 201 }
 202
 203 static const char *prettify_ref(const struct ref *ref)
 204 {
 205         const char *name = ref->name;
 206         return name + (
 207                 !prefixcmp(name, "refs/heads/") ? 11 :
 208                 !prefixcmp(name, "refs/tags/") ? 10 :
 209                 !prefixcmp(name, "refs/remotes/") ? 13 :
 210                 0);
 211 }
 212
 213 #define SUMMARY_WIDTH (2 * DEFAULT_ABBREV + 3)
 214
 215 static void print_ref_status(char flag, const char *summary, struct ref *to, struct ref *from, const char *msg)
 216 {
 217         fprintf(stderr, " %c %-*s ", flag, SUMMARY_WIDTH, summary);
 218         if (from)
 219                 fprintf(stderr, "%s -> %s", prettify_ref(from), prettify_ref(to));
 220         else
 221                 fputs(prettify_ref(to), stderr);
 222         if (msg) {
 223                 fputs(" (", stderr);
 224                 fputs(msg, stderr);
 225                 fputc(')', stderr);
 226         }
 227         fputc('\n', stderr);
 228 }
 229
 230 static const char *status_abbrev(unsigned char sha1[20])
 231 {
 232         const char *abbrev;
 233         abbrev = find_unique_abbrev(sha1, DEFAULT_ABBREV);
 234         return abbrev ? abbrev : sha1_to_hex(sha1);
 235 }
 236
 237 static void print_ok_ref_status(struct ref *ref)
 238 {
 239         if (ref->deletion)
 240                 print_ref_status('-', "[deleted]", ref, NULL, NULL);
 241         else if (is_null_sha1(ref->old_sha1))
 242                 print_ref_status('*',
 243                         (!prefixcmp(ref->name, "refs/tags/") ? "[new tag]" :
 244                           "[new branch]"),
 245                         ref, ref->peer_ref, NULL);
 246         else {
 247                 char quickref[84];
 248                 char type;
 249                 const char *msg;
 250
 251                 strcpy(quickref, status_abbrev(ref->old_sha1));
 252                 if (ref->nonfastforward) {
 253                         strcat(quickref, "...");
 254                         type = '+';
 255                         msg = "forced update";
 256                 } else {
 257                         strcat(quickref, "..");
 258                         type = ' ';
 259                         msg = NULL;
 260                 }
 261                 strcat(quickref, status_abbrev(ref->new_sha1));
 262
 263                 print_ref_status(type, quickref, ref, ref->peer_ref, msg);
 264         }
 265 }
 266
 267 static void print_push_status(const char *dest, struct ref *refs)
 268 {
 269         struct ref *ref;
 270         int shown_dest = 0;
 271
 272         for (ref = refs; ref; ref = ref->next) {
 273                 if (!ref->status)
 274                         continue;
 275                 if (ref->status == REF_STATUS_UPTODATE && !args.verbose)
 276                         continue;
 277
 278                 if (!shown_dest) {
 279                         fprintf(stderr, "To %s\n", dest);
 280                         shown_dest = 1;
 281                 }
 282
 283                 switch(ref->status) {
 284                 case REF_STATUS_NONE:
 285                         print_ref_status('X', "[no match]", ref, NULL, NULL);
 286                         break;
 287                 case REF_STATUS_REJECT_NODELETE:
 288                         print_ref_status('!', "[rejected]", ref, NULL,
 289                                         "remote does not support deleting refs");
 290                         break;
 291                 case REF_STATUS_UPTODATE:
 292                         print_ref_status('=', "[up to date]", ref,
 293                                         ref->peer_ref, NULL);
 294                         break;
 295                 case REF_STATUS_REJECT_NONFASTFORWARD:
 296                         print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 297                                         "non-fast forward");
 298                         break;
 299                 case REF_STATUS_OK:
 300                         print_ok_ref_status(ref);
 301                         break;
 302                 }
 303         }
 304 }
 305
 306 static int do_send_pack(int in, int out, struct remote *remote, const char *dest, int nr_refspec, const char **refspec)
 307 {
 308         struct ref *ref;
 309         int new_refs;
 310         int ask_for_status_report = 0;
 311         int allow_deleting_refs = 0;
 312         int expect_status_report = 0;
 313         int flags = MATCH_REFS_NONE;
 314
 315         if (args.send_all)
 316                 flags |= MATCH_REFS_ALL;
 317         if (args.send_mirror)
 318                 flags |= MATCH_REFS_MIRROR;
 319
 320         /* No funny business with the matcher */
 321         remote_tail = get_remote_heads(in, &remote_refs, 0, NULL, REF_NORMAL);
 322         get_local_heads();
 323
 324         /* Does the other end support the reporting? */
 325         if (server_supports("report-status"))
 326                 ask_for_status_report = 1;
 327         if (server_supports("delete-refs"))
 328                 allow_deleting_refs = 1;
 329
 330         /* match them up */
 331         if (!remote_tail)
 332                 remote_tail = &remote_refs;
 333         if (match_refs(local_refs, remote_refs, &remote_tail,
 334                                                nr_refspec, refspec, flags))
 335                 return -1;
 336
 337         if (!remote_refs) {
 338                 fprintf(stderr, "No refs in common and none specified; doing nothing.\n"
 339                         "Perhaps you should specify a branch such as 'master'.\n");
 340                 return 0;
 341         }
 342
 343         /*
 344          * Finally, tell the other end!
 345          */
 346         new_refs = 0;
 347         for (ref = remote_refs; ref; ref = ref->next) {
 348                 const unsigned char *new_sha1;
 349
 350                 if (!ref->peer_ref) {
 351                         if (!args.send_mirror)
 352                                 continue;
 353                         new_sha1 = null_sha1;
 354                 }
 355                 else
 356                         new_sha1 = ref->peer_ref->new_sha1;
 357
 358
 359                 ref->deletion = is_null_sha1(new_sha1);
 360                 if (ref->deletion && !allow_deleting_refs) {
 361                         ref->status = REF_STATUS_REJECT_NODELETE;
 362                         continue;
 363                 }
 364                 if (!ref->deletion &&
 365                     !hashcmp(ref->old_sha1, new_sha1)) {
 366                         ref->status = REF_STATUS_UPTODATE;
 367                         continue;
 368                 }
 369
 370                 /* This part determines what can overwrite what.
 371                  * The rules are:
 372                  *
 373                  * (0) you can always use --force or +A:B notation to
 374                  *     selectively force individual ref pairs.
 375                  *
 376                  * (1) if the old thing does not exist, it is OK.
 377                  *
 378                  * (2) if you do not have the old thing, you are not allowed
 379                  *     to overwrite it; you would not know what you are losing
 380                  *     otherwise.
 381                  *
 382                  * (3) if both new and old are commit-ish, and new is a
 383                  *     descendant of old, it is OK.
 384                  *
 385                  * (4) regardless of all of the above, removing :B is
 386                  *     always allowed.
 387                  */
 388
 389                 ref->nonfastforward =
 390                     !ref->deletion &&
 391                     !is_null_sha1(ref->old_sha1) &&
 392                     (!has_sha1_file(ref->old_sha1)
 393                       || !ref_newer(new_sha1, ref->old_sha1));
 394
 395                 if (ref->nonfastforward && !ref->force && !args.force_update) {
 396                         ref->status = REF_STATUS_REJECT_NONFASTFORWARD;
 397                         continue;
 398                 }
 399
 400                 hashcpy(ref->new_sha1, new_sha1);
 401                 if (!ref->deletion)
 402                         new_refs++;
 403                 ref->status = REF_STATUS_OK;
 404
 405                 if (!args.dry_run) {
 406                         char *old_hex = sha1_to_hex(ref->old_sha1);
 407                         char *new_hex = sha1_to_hex(ref->new_sha1);
 408
 409                         if (ask_for_status_report) {
 410                                 packet_write(out, "%s %s %s%c%s",
 411                                         old_hex, new_hex, ref->name, 0,
 412                                         "report-status");
 413                                 ask_for_status_report = 0;
 414                                 expect_status_report = 1;
 415                         }
 416                         else
 417                                 packet_write(out, "%s %s %s",
 418                                         old_hex, new_hex, ref->name);
 419                 }
 420         }
 421
 422         packet_flush(out);
 423         if (new_refs && !args.dry_run) {
 424                 if (pack_objects(out, remote_refs) < 0) {
 425                         close(out);
 426                         return -1;
 427                 }
 428         }
 429         close(out);
 430
 431         print_push_status(dest, remote_refs);
 432
 433         if (expect_status_report) {
 434                 if (receive_status(in))
 435                         return -1;
 436         }
 437
 438         if (!args.dry_run && remote) {
 439                 for (ref = remote_refs; ref; ref = ref->next)
 440                         update_tracking_ref(remote, ref);
 441         }
 442
 443         if (!new_refs)
 444                 fprintf(stderr, "Everything up-to-date\n");
 445         for (ref = remote_refs; ref; ref = ref->next) {
 446                 switch (ref->status) {
 447                 case REF_STATUS_NONE:
 448                 case REF_STATUS_UPTODATE:
 449                 case REF_STATUS_OK:
 450                         break;
 451                 default:
 452                         return -1;
 453                 }
 454         }
 455         return 0;
 456 }
 457
 458 static void verify_remote_names(int nr_heads, const char **heads)
 459 {
 460         int i;
 461
 462         for (i = 0; i < nr_heads; i++) {
 463                 const char *remote = strchr(heads[i], ':');
 464
 465                 remote = remote ? (remote + 1) : heads[i];
 466                 switch (check_ref_format(remote)) {
 467                 case 0: /* ok */
 468                 case -2: /* ok but a single level -- that is fine for
 469                           * a match pattern.
 470                           */
 471                 case -3: /* ok but ends with a pattern-match character */
 472                         continue;
 473                 }
 474                 die("remote part of refspec is not a valid name in %s",
 475                     heads[i]);
 476         }
 477 }
 478
 479 int cmd_send_pack(int argc, const char **argv, const char *prefix)
 480 {
 481         int i, nr_heads = 0;
 482         const char **heads = NULL;
 483         const char *remote_name = NULL;
 484         struct remote *remote = NULL;
 485         const char *dest = NULL;
 486
 487         argv++;
 488         for (i = 1; i < argc; i++, argv++) {
 489                 const char *arg = *argv;
 490
 491                 if (*arg == '-') {
 492                         if (!prefixcmp(arg, "--receive-pack=")) {
 493                                 args.receivepack = arg + 15;
 494                                 continue;
 495                         }
 496                         if (!prefixcmp(arg, "--exec=")) {
 497                                 args.receivepack = arg + 7;
 498                                 continue;
 499                         }
 500                         if (!prefixcmp(arg, "--remote=")) {
 501                                 remote_name = arg + 9;
 502                                 continue;
 503                         }
 504                         if (!strcmp(arg, "--all")) {
 505                                 args.send_all = 1;
 506                                 continue;
 507                         }
 508                         if (!strcmp(arg, "--dry-run")) {
 509                                 args.dry_run = 1;
 510                                 continue;
 511                         }
 512                         if (!strcmp(arg, "--mirror")) {
 513                                 args.send_mirror = 1;
 514                                 continue;
 515                         }
 516                         if (!strcmp(arg, "--force")) {
 517                                 args.force_update = 1;
 518                                 continue;
 519                         }
 520                         if (!strcmp(arg, "--verbose")) {
 521                                 args.verbose = 1;
 522                                 continue;
 523                         }
 524                         if (!strcmp(arg, "--thin")) {
 525                                 args.use_thin_pack = 1;
 526                                 continue;
 527                         }
 528                         usage(send_pack_usage);
 529                 }
 530                 if (!dest) {
 531                         dest = arg;
 532                         continue;
 533                 }
 534                 heads = (const char **) argv;
 535                 nr_heads = argc - i;
 536                 break;
 537         }
 538         if (!dest)
 539                 usage(send_pack_usage);
 540         /*
 541          * --all and --mirror are incompatible; neither makes sense
 542          * with any refspecs.
 543          */
 544         if ((heads && (args.send_all || args.send_mirror)) ||
 545                                         (args.send_all && args.send_mirror))
 546                 usage(send_pack_usage);
 547
 548         if (remote_name) {
 549                 remote = remote_get(remote_name);
 550                 if (!remote_has_url(remote, dest)) {
 551                         die("Destination %s is not a uri for %s",
 552                             dest, remote_name);
 553                 }
 554         }
 555
 556         return send_pack(&args, dest, remote, nr_heads, heads);
 557 }
 558
 559 int send_pack(struct send_pack_args *my_args,
 560               const char *dest, struct remote *remote,
 561               int nr_heads, const char **heads)
 562 {
 563         int fd[2], ret;
 564         struct child_process *conn;
 565
 566         memcpy(&args, my_args, sizeof(args));
 567
 568         verify_remote_names(nr_heads, heads);
 569
 570         conn = git_connect(fd, dest, args.receivepack, args.verbose ? CONNECT_VERBOSE : 0);
 571         ret = do_send_pack(fd[0], fd[1], remote, dest, nr_heads, heads);
 572         close(fd[0]);
 573         close(fd[1]);
 574         ret |= finish_connect(conn);
 575         return !!ret;
 576 }