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 struct ref *set_ref_error(struct ref *refs, const char *line)
 150 {
 151         struct ref *ref;
 152
 153         for (ref = refs; ref; ref = ref->next) {
 154                 const char *msg;
 155                 if (prefixcmp(line, ref->name))
 156                         continue;
 157                 msg = line + strlen(ref->name);
 158                 if (*msg++ != ' ')
 159                         continue;
 160                 ref->status = REF_STATUS_REMOTE_REJECT;
 161                 ref->error = xstrdup(msg);
 162                 ref->error[strlen(ref->error)-1] = '\0';
 163                 return ref;
 164         }
 165         return NULL;
 166 }
 167
 168 /* a return value of -1 indicates that an error occurred,
 169  * but we were able to set individual ref errors. A return
 170  * value of -2 means we couldn't even get that far. */
 171 static int receive_status(int in, struct ref *refs)
 172 {
 173         struct ref *hint;
 174         char line[1000];
 175         int ret = 0;
 176         int len = packet_read_line(in, line, sizeof(line));
 177         if (len < 10 || memcmp(line, "unpack ", 7)) {
 178                 fprintf(stderr, "did not receive status back\n");
 179                 return -2;
 180         }
 181         if (memcmp(line, "unpack ok\n", 10)) {
 182                 fputs(line, stderr);
 183                 ret = -1;
 184         }
 185         hint = NULL;
 186         while (1) {
 187                 len = packet_read_line(in, line, sizeof(line));
 188                 if (!len)
 189                         break;
 190                 if (len < 3 ||
 191                     (memcmp(line, "ok", 2) && memcmp(line, "ng", 2))) {
 192                         fprintf(stderr, "protocol error: %s\n", line);
 193                         ret = -1;
 194                         break;
 195                 }
 196                 if (!memcmp(line, "ok", 2))
 197                         continue;
 198                 if (hint)
 199                         hint = set_ref_error(hint, line + 3);
 200                 if (!hint)
 201                         hint = set_ref_error(refs, line + 3);
 202                 ret = -1;
 203         }
 204         return ret;
 205 }
 206
 207 static void update_tracking_ref(struct remote *remote, struct ref *ref)
 208 {
 209         struct refspec rs;
 210
 211         if (ref->status != REF_STATUS_OK)
 212                 return;
 213
 214         rs.src = ref->name;
 215         rs.dst = NULL;
 216
 217         if (!remote_find_tracking(remote, &rs)) {
 218                 if (args.verbose)
 219                         fprintf(stderr, "updating local tracking ref '%s'\n", rs.dst);
 220                 if (ref->deletion) {
 221                         if (delete_ref(rs.dst, NULL))
 222                                 error("Failed to delete");
 223                 } else
 224                         update_ref("update by push", rs.dst,
 225                                         ref->new_sha1, NULL, 0, 0);
 226                 free(rs.dst);
 227         }
 228 }
 229
 230 static const char *prettify_ref(const struct ref *ref)
 231 {
 232         const char *name = ref->name;
 233         return name + (
 234                 !prefixcmp(name, "refs/heads/") ? 11 :
 235                 !prefixcmp(name, "refs/tags/") ? 10 :
 236                 !prefixcmp(name, "refs/remotes/") ? 13 :
 237                 0);
 238 }
 239
 240 #define SUMMARY_WIDTH (2 * DEFAULT_ABBREV + 3)
 241
 242 static void print_ref_status(char flag, const char *summary, struct ref *to, struct ref *from, const char *msg)
 243 {
 244         fprintf(stderr, " %c %-*s ", flag, SUMMARY_WIDTH, summary);
 245         if (from)
 246                 fprintf(stderr, "%s -> %s", prettify_ref(from), prettify_ref(to));
 247         else
 248                 fputs(prettify_ref(to), stderr);
 249         if (msg) {
 250                 fputs(" (", stderr);
 251                 fputs(msg, stderr);
 252                 fputc(')', stderr);
 253         }
 254         fputc('\n', stderr);
 255 }
 256
 257 static const char *status_abbrev(unsigned char sha1[20])
 258 {
 259         const char *abbrev;
 260         abbrev = find_unique_abbrev(sha1, DEFAULT_ABBREV);
 261         return abbrev ? abbrev : sha1_to_hex(sha1);
 262 }
 263
 264 static void print_ok_ref_status(struct ref *ref)
 265 {
 266         if (ref->deletion)
 267                 print_ref_status('-', "[deleted]", ref, NULL, NULL);
 268         else if (is_null_sha1(ref->old_sha1))
 269                 print_ref_status('*',
 270                         (!prefixcmp(ref->name, "refs/tags/") ? "[new tag]" :
 271                           "[new branch]"),
 272                         ref, ref->peer_ref, NULL);
 273         else {
 274                 char quickref[84];
 275                 char type;
 276                 const char *msg;
 277
 278                 strcpy(quickref, status_abbrev(ref->old_sha1));
 279                 if (ref->nonfastforward) {
 280                         strcat(quickref, "...");
 281                         type = '+';
 282                         msg = "forced update";
 283                 } else {
 284                         strcat(quickref, "..");
 285                         type = ' ';
 286                         msg = NULL;
 287                 }
 288                 strcat(quickref, status_abbrev(ref->new_sha1));
 289
 290                 print_ref_status(type, quickref, ref, ref->peer_ref, msg);
 291         }
 292 }
 293
 294 static void print_push_status(const char *dest, struct ref *refs)
 295 {
 296         struct ref *ref;
 297         int shown_dest = 0;
 298
 299         for (ref = refs; ref; ref = ref->next) {
 300                 if (!ref->status)
 301                         continue;
 302                 if (ref->status == REF_STATUS_UPTODATE && !args.verbose)
 303                         continue;
 304
 305                 if (!shown_dest) {
 306                         fprintf(stderr, "To %s\n", dest);
 307                         shown_dest = 1;
 308                 }
 309
 310                 switch(ref->status) {
 311                 case REF_STATUS_NONE:
 312                         print_ref_status('X', "[no match]", ref, NULL, NULL);
 313                         break;
 314                 case REF_STATUS_REJECT_NODELETE:
 315                         print_ref_status('!', "[rejected]", ref, NULL,
 316                                         "remote does not support deleting refs");
 317                         break;
 318                 case REF_STATUS_UPTODATE:
 319                         print_ref_status('=', "[up to date]", ref,
 320                                         ref->peer_ref, NULL);
 321                         break;
 322                 case REF_STATUS_REJECT_NONFASTFORWARD:
 323                         print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 324                                         "non-fast forward");
 325                         break;
 326                 case REF_STATUS_REMOTE_REJECT:
 327                         if (ref->deletion)
 328                                 print_ref_status('!', "[remote rejected]", ref, NULL, ref->error);
 329                         else
 330                                 print_ref_status('!', "[remote rejected]", ref, ref->peer_ref, ref->error);
 331                         break;
 332                 case REF_STATUS_OK:
 333                         print_ok_ref_status(ref);
 334                         break;
 335                 }
 336         }
 337 }
 338
 339 static int do_send_pack(int in, int out, struct remote *remote, const char *dest, int nr_refspec, const char **refspec)
 340 {
 341         struct ref *ref;
 342         int new_refs;
 343         int ask_for_status_report = 0;
 344         int allow_deleting_refs = 0;
 345         int expect_status_report = 0;
 346         int flags = MATCH_REFS_NONE;
 347         int ret;
 348
 349         if (args.send_all)
 350                 flags |= MATCH_REFS_ALL;
 351         if (args.send_mirror)
 352                 flags |= MATCH_REFS_MIRROR;
 353
 354         /* No funny business with the matcher */
 355         remote_tail = get_remote_heads(in, &remote_refs, 0, NULL, REF_NORMAL);
 356         get_local_heads();
 357
 358         /* Does the other end support the reporting? */
 359         if (server_supports("report-status"))
 360                 ask_for_status_report = 1;
 361         if (server_supports("delete-refs"))
 362                 allow_deleting_refs = 1;
 363
 364         /* match them up */
 365         if (!remote_tail)
 366                 remote_tail = &remote_refs;
 367         if (match_refs(local_refs, remote_refs, &remote_tail,
 368                                                nr_refspec, refspec, flags))
 369                 return -1;
 370
 371         if (!remote_refs) {
 372                 fprintf(stderr, "No refs in common and none specified; doing nothing.\n"
 373                         "Perhaps you should specify a branch such as 'master'.\n");
 374                 return 0;
 375         }
 376
 377         /*
 378          * Finally, tell the other end!
 379          */
 380         new_refs = 0;
 381         for (ref = remote_refs; ref; ref = ref->next) {
 382                 const unsigned char *new_sha1;
 383
 384                 if (!ref->peer_ref) {
 385                         if (!args.send_mirror)
 386                                 continue;
 387                         new_sha1 = null_sha1;
 388                 }
 389                 else
 390                         new_sha1 = ref->peer_ref->new_sha1;
 391
 392
 393                 ref->deletion = is_null_sha1(new_sha1);
 394                 if (ref->deletion && !allow_deleting_refs) {
 395                         ref->status = REF_STATUS_REJECT_NODELETE;
 396                         continue;
 397                 }
 398                 if (!ref->deletion &&
 399                     !hashcmp(ref->old_sha1, new_sha1)) {
 400                         ref->status = REF_STATUS_UPTODATE;
 401                         continue;
 402                 }
 403
 404                 /* This part determines what can overwrite what.
 405                  * The rules are:
 406                  *
 407                  * (0) you can always use --force or +A:B notation to
 408                  *     selectively force individual ref pairs.
 409                  *
 410                  * (1) if the old thing does not exist, it is OK.
 411                  *
 412                  * (2) if you do not have the old thing, you are not allowed
 413                  *     to overwrite it; you would not know what you are losing
 414                  *     otherwise.
 415                  *
 416                  * (3) if both new and old are commit-ish, and new is a
 417                  *     descendant of old, it is OK.
 418                  *
 419                  * (4) regardless of all of the above, removing :B is
 420                  *     always allowed.
 421                  */
 422
 423                 ref->nonfastforward =
 424                     !ref->deletion &&
 425                     !is_null_sha1(ref->old_sha1) &&
 426                     (!has_sha1_file(ref->old_sha1)
 427                       || !ref_newer(new_sha1, ref->old_sha1));
 428
 429                 if (ref->nonfastforward && !ref->force && !args.force_update) {
 430                         ref->status = REF_STATUS_REJECT_NONFASTFORWARD;
 431                         continue;
 432                 }
 433
 434                 hashcpy(ref->new_sha1, new_sha1);
 435                 if (!ref->deletion)
 436                         new_refs++;
 437                 ref->status = REF_STATUS_OK;
 438
 439                 if (!args.dry_run) {
 440                         char *old_hex = sha1_to_hex(ref->old_sha1);
 441                         char *new_hex = sha1_to_hex(ref->new_sha1);
 442
 443                         if (ask_for_status_report) {
 444                                 packet_write(out, "%s %s %s%c%s",
 445                                         old_hex, new_hex, ref->name, 0,
 446                                         "report-status");
 447                                 ask_for_status_report = 0;
 448                                 expect_status_report = 1;
 449                         }
 450                         else
 451                                 packet_write(out, "%s %s %s",
 452                                         old_hex, new_hex, ref->name);
 453                 }
 454         }
 455
 456         packet_flush(out);
 457         if (new_refs && !args.dry_run) {
 458                 if (pack_objects(out, remote_refs) < 0) {
 459                         close(out);
 460                         return -1;
 461                 }
 462         }
 463         close(out);
 464
 465         if (expect_status_report) {
 466                 ret = receive_status(in, remote_refs);
 467                 if (ret == -2)
 468                         return -1;
 469         }
 470         else
 471                 ret = 0;
 472
 473         print_push_status(dest, remote_refs);
 474
 475         if (!args.dry_run && remote) {
 476                 for (ref = remote_refs; ref; ref = ref->next)
 477                         update_tracking_ref(remote, ref);
 478         }
 479
 480         if (!new_refs)
 481                 fprintf(stderr, "Everything up-to-date\n");
 482         if (ret < 0)
 483                 return ret;
 484         for (ref = remote_refs; ref; ref = ref->next) {
 485                 switch (ref->status) {
 486                 case REF_STATUS_NONE:
 487                 case REF_STATUS_UPTODATE:
 488                 case REF_STATUS_OK:
 489                         break;
 490                 default:
 491                         return -1;
 492                 }
 493         }
 494         return 0;
 495 }
 496
 497 static void verify_remote_names(int nr_heads, const char **heads)
 498 {
 499         int i;
 500
 501         for (i = 0; i < nr_heads; i++) {
 502                 const char *remote = strchr(heads[i], ':');
 503
 504                 remote = remote ? (remote + 1) : heads[i];
 505                 switch (check_ref_format(remote)) {
 506                 case 0: /* ok */
 507                 case -2: /* ok but a single level -- that is fine for
 508                           * a match pattern.
 509                           */
 510                 case -3: /* ok but ends with a pattern-match character */
 511                         continue;
 512                 }
 513                 die("remote part of refspec is not a valid name in %s",
 514                     heads[i]);
 515         }
 516 }
 517
 518 int cmd_send_pack(int argc, const char **argv, const char *prefix)
 519 {
 520         int i, nr_heads = 0;
 521         const char **heads = NULL;
 522         const char *remote_name = NULL;
 523         struct remote *remote = NULL;
 524         const char *dest = NULL;
 525
 526         argv++;
 527         for (i = 1; i < argc; i++, argv++) {
 528                 const char *arg = *argv;
 529
 530                 if (*arg == '-') {
 531                         if (!prefixcmp(arg, "--receive-pack=")) {
 532                                 args.receivepack = arg + 15;
 533                                 continue;
 534                         }
 535                         if (!prefixcmp(arg, "--exec=")) {
 536                                 args.receivepack = arg + 7;
 537                                 continue;
 538                         }
 539                         if (!prefixcmp(arg, "--remote=")) {
 540                                 remote_name = arg + 9;
 541                                 continue;
 542                         }
 543                         if (!strcmp(arg, "--all")) {
 544                                 args.send_all = 1;
 545                                 continue;
 546                         }
 547                         if (!strcmp(arg, "--dry-run")) {
 548                                 args.dry_run = 1;
 549                                 continue;
 550                         }
 551                         if (!strcmp(arg, "--mirror")) {
 552                                 args.send_mirror = 1;
 553                                 continue;
 554                         }
 555                         if (!strcmp(arg, "--force")) {
 556                                 args.force_update = 1;
 557                                 continue;
 558                         }
 559                         if (!strcmp(arg, "--verbose")) {
 560                                 args.verbose = 1;
 561                                 continue;
 562                         }
 563                         if (!strcmp(arg, "--thin")) {
 564                                 args.use_thin_pack = 1;
 565                                 continue;
 566                         }
 567                         usage(send_pack_usage);
 568                 }
 569                 if (!dest) {
 570                         dest = arg;
 571                         continue;
 572                 }
 573                 heads = (const char **) argv;
 574                 nr_heads = argc - i;
 575                 break;
 576         }
 577         if (!dest)
 578                 usage(send_pack_usage);
 579         /*
 580          * --all and --mirror are incompatible; neither makes sense
 581          * with any refspecs.
 582          */
 583         if ((heads && (args.send_all || args.send_mirror)) ||
 584                                         (args.send_all && args.send_mirror))
 585                 usage(send_pack_usage);
 586
 587         if (remote_name) {
 588                 remote = remote_get(remote_name);
 589                 if (!remote_has_url(remote, dest)) {
 590                         die("Destination %s is not a uri for %s",
 591                             dest, remote_name);
 592                 }
 593         }
 594
 595         return send_pack(&args, dest, remote, nr_heads, heads);
 596 }
 597
 598 int send_pack(struct send_pack_args *my_args,
 599               const char *dest, struct remote *remote,
 600               int nr_heads, const char **heads)
 601 {
 602         int fd[2], ret;
 603         struct child_process *conn;
 604
 605         memcpy(&args, my_args, sizeof(args));
 606
 607         verify_remote_names(nr_heads, heads);
 608
 609         conn = git_connect(fd, dest, args.receivepack, args.verbose ? CONNECT_VERBOSE : 0);
 610         ret = do_send_pack(fd[0], fd[1], remote, dest, nr_heads, heads);
 611         close(fd[0]);
 612         close(fd[1]);
 613         ret |= finish_connect(conn);
 614         return !!ret;
 615 }