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, struct ref *refs)
 150 {
 151         struct ref *hint;
 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                 return error("did not receive remote status");
 157         if (memcmp(line, "unpack ok\n", 10)) {
 158                 char *p = line + strlen(line) - 1;
 159                 if (*p == '\n')
 160                         *p = '\0';
 161                 error("unpack failed: %s", line + 7);
 162                 ret = -1;
 163         }
 164         hint = NULL;
 165         while (1) {
 166                 char *refname;
 167                 char *msg;
 168                 len = packet_read_line(in, line, sizeof(line));
 169                 if (!len)
 170                         break;
 171                 if (len < 3 ||
 172                     (memcmp(line, "ok ", 3) && memcmp(line, "ng ", 3))) {
 173                         fprintf(stderr, "protocol error: %s\n", line);
 174                         ret = -1;
 175                         break;
 176                 }
 177
 178                 line[strlen(line)-1] = '\0';
 179                 refname = line + 3;
 180                 msg = strchr(refname, ' ');
 181                 if (msg)
 182                         *msg++ = '\0';
 183
 184                 /* first try searching at our hint, falling back to all refs */
 185                 if (hint)
 186                         hint = find_ref_by_name(hint, refname);
 187                 if (!hint)
 188                         hint = find_ref_by_name(refs, refname);
 189                 if (!hint) {
 190                         warning("remote reported status on unknown ref: %s",
 191                                         refname);
 192                         continue;
 193                 }
 194                 if (hint->status != REF_STATUS_EXPECTING_REPORT) {
 195                         warning("remote reported status on unexpected ref: %s",
 196                                         refname);
 197                         continue;
 198                 }
 199
 200                 if (line[0] == 'o' && line[1] == 'k')
 201                         hint->status = REF_STATUS_OK;
 202                 else {
 203                         hint->status = REF_STATUS_REMOTE_REJECT;
 204                         ret = -1;
 205                 }
 206                 if (msg)
 207                         hint->remote_status = xstrdup(msg);
 208                 /* start our next search from the next ref */
 209                 hint = hint->next;
 210         }
 211         return ret;
 212 }
 213
 214 static void update_tracking_ref(struct remote *remote, struct ref *ref)
 215 {
 216         struct refspec rs;
 217
 218         if (ref->status != REF_STATUS_OK)
 219                 return;
 220
 221         rs.src = ref->name;
 222         rs.dst = NULL;
 223
 224         if (!remote_find_tracking(remote, &rs)) {
 225                 if (args.verbose)
 226                         fprintf(stderr, "updating local tracking ref '%s'\n", rs.dst);
 227                 if (ref->deletion) {
 228                         if (delete_ref(rs.dst, NULL))
 229                                 error("Failed to delete");
 230                 } else
 231                         update_ref("update by push", rs.dst,
 232                                         ref->new_sha1, NULL, 0, 0);
 233                 free(rs.dst);
 234         }
 235 }
 236
 237 static const char *prettify_ref(const struct ref *ref)
 238 {
 239         const char *name = ref->name;
 240         return name + (
 241                 !prefixcmp(name, "refs/heads/") ? 11 :
 242                 !prefixcmp(name, "refs/tags/") ? 10 :
 243                 !prefixcmp(name, "refs/remotes/") ? 13 :
 244                 0);
 245 }
 246
 247 #define SUMMARY_WIDTH (2 * DEFAULT_ABBREV + 3)
 248
 249 static void print_ref_status(char flag, const char *summary, struct ref *to, struct ref *from, const char *msg)
 250 {
 251         fprintf(stderr, " %c %-*s ", flag, SUMMARY_WIDTH, summary);
 252         if (from)
 253                 fprintf(stderr, "%s -> %s", prettify_ref(from), prettify_ref(to));
 254         else
 255                 fputs(prettify_ref(to), stderr);
 256         if (msg) {
 257                 fputs(" (", stderr);
 258                 fputs(msg, stderr);
 259                 fputc(')', stderr);
 260         }
 261         fputc('\n', stderr);
 262 }
 263
 264 static const char *status_abbrev(unsigned char sha1[20])
 265 {
 266         const char *abbrev;
 267         abbrev = find_unique_abbrev(sha1, DEFAULT_ABBREV);
 268         return abbrev ? abbrev : sha1_to_hex(sha1);
 269 }
 270
 271 static void print_ok_ref_status(struct ref *ref)
 272 {
 273         if (ref->deletion)
 274                 print_ref_status('-', "[deleted]", ref, NULL, NULL);
 275         else if (is_null_sha1(ref->old_sha1))
 276                 print_ref_status('*',
 277                         (!prefixcmp(ref->name, "refs/tags/") ? "[new tag]" :
 278                           "[new branch]"),
 279                         ref, ref->peer_ref, NULL);
 280         else {
 281                 char quickref[84];
 282                 char type;
 283                 const char *msg;
 284
 285                 strcpy(quickref, status_abbrev(ref->old_sha1));
 286                 if (ref->nonfastforward) {
 287                         strcat(quickref, "...");
 288                         type = '+';
 289                         msg = "forced update";
 290                 } else {
 291                         strcat(quickref, "..");
 292                         type = ' ';
 293                         msg = NULL;
 294                 }
 295                 strcat(quickref, status_abbrev(ref->new_sha1));
 296
 297                 print_ref_status(type, quickref, ref, ref->peer_ref, msg);
 298         }
 299 }
 300
 301 static void print_push_status(const char *dest, struct ref *refs)
 302 {
 303         struct ref *ref;
 304         int shown_dest = 0;
 305
 306         for (ref = refs; ref; ref = ref->next) {
 307                 if (!ref->status)
 308                         continue;
 309                 if (ref->status == REF_STATUS_UPTODATE && !args.verbose)
 310                         continue;
 311
 312                 if (!shown_dest) {
 313                         fprintf(stderr, "To %s\n", dest);
 314                         shown_dest = 1;
 315                 }
 316
 317                 switch(ref->status) {
 318                 case REF_STATUS_NONE:
 319                         print_ref_status('X', "[no match]", ref, NULL, NULL);
 320                         break;
 321                 case REF_STATUS_REJECT_NODELETE:
 322                         print_ref_status('!', "[rejected]", ref, NULL,
 323                                         "remote does not support deleting refs");
 324                         break;
 325                 case REF_STATUS_UPTODATE:
 326                         print_ref_status('=', "[up to date]", ref,
 327                                         ref->peer_ref, NULL);
 328                         break;
 329                 case REF_STATUS_REJECT_NONFASTFORWARD:
 330                         print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 331                                         "non-fast forward");
 332                         break;
 333                 case REF_STATUS_REMOTE_REJECT:
 334                         print_ref_status('!', "[remote rejected]", ref,
 335                                         ref->deletion ? NULL : ref->peer_ref,
 336                                         ref->remote_status);
 337                         break;
 338                 case REF_STATUS_EXPECTING_REPORT:
 339                         print_ref_status('!', "[remote failure]", ref,
 340                                         ref->deletion ? NULL : ref->peer_ref,
 341                                         "remote failed to report status");
 342                         break;
 343                 case REF_STATUS_OK:
 344                         print_ok_ref_status(ref);
 345                         break;
 346                 }
 347         }
 348 }
 349
 350 static int do_send_pack(int in, int out, struct remote *remote, const char *dest, int nr_refspec, const char **refspec)
 351 {
 352         struct ref *ref;
 353         int new_refs;
 354         int ask_for_status_report = 0;
 355         int allow_deleting_refs = 0;
 356         int expect_status_report = 0;
 357         int flags = MATCH_REFS_NONE;
 358         int ret;
 359
 360         if (args.send_all)
 361                 flags |= MATCH_REFS_ALL;
 362         if (args.send_mirror)
 363                 flags |= MATCH_REFS_MIRROR;
 364
 365         /* No funny business with the matcher */
 366         remote_tail = get_remote_heads(in, &remote_refs, 0, NULL, REF_NORMAL);
 367         get_local_heads();
 368
 369         /* Does the other end support the reporting? */
 370         if (server_supports("report-status"))
 371                 ask_for_status_report = 1;
 372         if (server_supports("delete-refs"))
 373                 allow_deleting_refs = 1;
 374
 375         /* match them up */
 376         if (!remote_tail)
 377                 remote_tail = &remote_refs;
 378         if (match_refs(local_refs, remote_refs, &remote_tail,
 379                                                nr_refspec, refspec, flags))
 380                 return -1;
 381
 382         if (!remote_refs) {
 383                 fprintf(stderr, "No refs in common and none specified; doing nothing.\n"
 384                         "Perhaps you should specify a branch such as 'master'.\n");
 385                 return 0;
 386         }
 387
 388         /*
 389          * Finally, tell the other end!
 390          */
 391         new_refs = 0;
 392         for (ref = remote_refs; ref; ref = ref->next) {
 393                 const unsigned char *new_sha1;
 394
 395                 if (!ref->peer_ref) {
 396                         if (!args.send_mirror)
 397                                 continue;
 398                         new_sha1 = null_sha1;
 399                 }
 400                 else
 401                         new_sha1 = ref->peer_ref->new_sha1;
 402
 403
 404                 ref->deletion = is_null_sha1(new_sha1);
 405                 if (ref->deletion && !allow_deleting_refs) {
 406                         ref->status = REF_STATUS_REJECT_NODELETE;
 407                         continue;
 408                 }
 409                 if (!ref->deletion &&
 410                     !hashcmp(ref->old_sha1, new_sha1)) {
 411                         ref->status = REF_STATUS_UPTODATE;
 412                         continue;
 413                 }
 414
 415                 /* This part determines what can overwrite what.
 416                  * The rules are:
 417                  *
 418                  * (0) you can always use --force or +A:B notation to
 419                  *     selectively force individual ref pairs.
 420                  *
 421                  * (1) if the old thing does not exist, it is OK.
 422                  *
 423                  * (2) if you do not have the old thing, you are not allowed
 424                  *     to overwrite it; you would not know what you are losing
 425                  *     otherwise.
 426                  *
 427                  * (3) if both new and old are commit-ish, and new is a
 428                  *     descendant of old, it is OK.
 429                  *
 430                  * (4) regardless of all of the above, removing :B is
 431                  *     always allowed.
 432                  */
 433
 434                 ref->nonfastforward =
 435                     !ref->deletion &&
 436                     !is_null_sha1(ref->old_sha1) &&
 437                     (!has_sha1_file(ref->old_sha1)
 438                       || !ref_newer(new_sha1, ref->old_sha1));
 439
 440                 if (ref->nonfastforward && !ref->force && !args.force_update) {
 441                         ref->status = REF_STATUS_REJECT_NONFASTFORWARD;
 442                         continue;
 443                 }
 444
 445                 hashcpy(ref->new_sha1, new_sha1);
 446                 if (!ref->deletion)
 447                         new_refs++;
 448
 449                 if (!args.dry_run) {
 450                         char *old_hex = sha1_to_hex(ref->old_sha1);
 451                         char *new_hex = sha1_to_hex(ref->new_sha1);
 452
 453                         if (ask_for_status_report) {
 454                                 packet_write(out, "%s %s %s%c%s",
 455                                         old_hex, new_hex, ref->name, 0,
 456                                         "report-status");
 457                                 ask_for_status_report = 0;
 458                                 expect_status_report = 1;
 459                         }
 460                         else
 461                                 packet_write(out, "%s %s %s",
 462                                         old_hex, new_hex, ref->name);
 463                 }
 464                 ref->status = expect_status_report ?
 465                         REF_STATUS_EXPECTING_REPORT :
 466                         REF_STATUS_OK;
 467         }
 468
 469         packet_flush(out);
 470         if (new_refs && !args.dry_run) {
 471                 if (pack_objects(out, remote_refs) < 0) {
 472                         close(out);
 473                         return -1;
 474                 }
 475         }
 476         close(out);
 477
 478         if (expect_status_report)
 479                 ret = receive_status(in, remote_refs);
 480         else
 481                 ret = 0;
 482
 483         print_push_status(dest, remote_refs);
 484
 485         if (!args.dry_run && remote) {
 486                 for (ref = remote_refs; ref; ref = ref->next)
 487                         update_tracking_ref(remote, ref);
 488         }
 489
 490         if (!new_refs)
 491                 fprintf(stderr, "Everything up-to-date\n");
 492         if (ret < 0)
 493                 return ret;
 494         for (ref = remote_refs; ref; ref = ref->next) {
 495                 switch (ref->status) {
 496                 case REF_STATUS_NONE:
 497                 case REF_STATUS_UPTODATE:
 498                 case REF_STATUS_OK:
 499                         break;
 500                 default:
 501                         return -1;
 502                 }
 503         }
 504         return 0;
 505 }
 506
 507 static void verify_remote_names(int nr_heads, const char **heads)
 508 {
 509         int i;
 510
 511         for (i = 0; i < nr_heads; i++) {
 512                 const char *remote = strchr(heads[i], ':');
 513
 514                 remote = remote ? (remote + 1) : heads[i];
 515                 switch (check_ref_format(remote)) {
 516                 case 0: /* ok */
 517                 case -2: /* ok but a single level -- that is fine for
 518                           * a match pattern.
 519                           */
 520                 case -3: /* ok but ends with a pattern-match character */
 521                         continue;
 522                 }
 523                 die("remote part of refspec is not a valid name in %s",
 524                     heads[i]);
 525         }
 526 }
 527
 528 int cmd_send_pack(int argc, const char **argv, const char *prefix)
 529 {
 530         int i, nr_heads = 0;
 531         const char **heads = NULL;
 532         const char *remote_name = NULL;
 533         struct remote *remote = NULL;
 534         const char *dest = NULL;
 535
 536         argv++;
 537         for (i = 1; i < argc; i++, argv++) {
 538                 const char *arg = *argv;
 539
 540                 if (*arg == '-') {
 541                         if (!prefixcmp(arg, "--receive-pack=")) {
 542                                 args.receivepack = arg + 15;
 543                                 continue;
 544                         }
 545                         if (!prefixcmp(arg, "--exec=")) {
 546                                 args.receivepack = arg + 7;
 547                                 continue;
 548                         }
 549                         if (!prefixcmp(arg, "--remote=")) {
 550                                 remote_name = arg + 9;
 551                                 continue;
 552                         }
 553                         if (!strcmp(arg, "--all")) {
 554                                 args.send_all = 1;
 555                                 continue;
 556                         }
 557                         if (!strcmp(arg, "--dry-run")) {
 558                                 args.dry_run = 1;
 559                                 continue;
 560                         }
 561                         if (!strcmp(arg, "--mirror")) {
 562                                 args.send_mirror = 1;
 563                                 continue;
 564                         }
 565                         if (!strcmp(arg, "--force")) {
 566                                 args.force_update = 1;
 567                                 continue;
 568                         }
 569                         if (!strcmp(arg, "--verbose")) {
 570                                 args.verbose = 1;
 571                                 continue;
 572                         }
 573                         if (!strcmp(arg, "--thin")) {
 574                                 args.use_thin_pack = 1;
 575                                 continue;
 576                         }
 577                         usage(send_pack_usage);
 578                 }
 579                 if (!dest) {
 580                         dest = arg;
 581                         continue;
 582                 }
 583                 heads = (const char **) argv;
 584                 nr_heads = argc - i;
 585                 break;
 586         }
 587         if (!dest)
 588                 usage(send_pack_usage);
 589         /*
 590          * --all and --mirror are incompatible; neither makes sense
 591          * with any refspecs.
 592          */
 593         if ((heads && (args.send_all || args.send_mirror)) ||
 594                                         (args.send_all && args.send_mirror))
 595                 usage(send_pack_usage);
 596
 597         if (remote_name) {
 598                 remote = remote_get(remote_name);
 599                 if (!remote_has_url(remote, dest)) {
 600                         die("Destination %s is not a uri for %s",
 601                             dest, remote_name);
 602                 }
 603         }
 604
 605         return send_pack(&args, dest, remote, nr_heads, heads);
 606 }
 607
 608 int send_pack(struct send_pack_args *my_args,
 609               const char *dest, struct remote *remote,
 610               int nr_heads, const char **heads)
 611 {
 612         int fd[2], ret;
 613         struct child_process *conn;
 614
 615         memcpy(&args, my_args, sizeof(args));
 616
 617         verify_remote_names(nr_heads, heads);
 618
 619         conn = git_connect(fd, dest, args.receivepack, args.verbose ? CONNECT_VERBOSE : 0);
 620         ret = do_send_pack(fd[0], fd[1], remote, dest, nr_heads, heads);
 621         close(fd[0]);
 622         close(fd[1]);
 623         ret |= finish_connect(conn);
 624         return !!ret;
 625 }