builtin/send-pack.c

   1 #include "cache.h"
   2 #include "commit.h"
   3 #include "refs.h"
   4 #include "pkt-line.h"
   5 #include "sideband.h"
   6 #include "run-command.h"
   7 #include "remote.h"
   8 #include "send-pack.h"
   9 #include "quote.h"
  10 #include "transport.h"
  11
  12 static const char send_pack_usage[] =
  13 "git send-pack [--all | --mirror] [--dry-run] [--force] [--receive-pack=<git-receive-pack>] [--verbose] [--thin] [<host>:]<directory> [<ref>...]\n"
  14 "  --all and explicit <ref> specification are mutually exclusive.";
  15
  16 static struct send_pack_args args;
  17
  18 static int feed_object(const unsigned char *sha1, int fd, int negative)
  19 {
  20         char buf[42];
  21
  22         if (negative && !has_sha1_file(sha1))
  23                 return 1;
  24
  25         memcpy(buf + negative, sha1_to_hex(sha1), 40);
  26         if (negative)
  27                 buf[0] = '^';
  28         buf[40 + negative] = '\n';
  29         return write_or_whine(fd, buf, 41 + negative, "send-pack: send refs");
  30 }
  31
  32 /*
  33  * Make a pack stream and spit it out into file descriptor fd
  34  */
  35 static int pack_objects(int fd, struct ref *refs, struct extra_have_objects *extra, struct send_pack_args *args)
  36 {
  37         /*
  38          * The child becomes pack-objects --revs; we feed
  39          * the revision parameters to it via its stdin and
  40          * let its stdout go back to the other end.
  41          */
  42         const char *argv[] = {
  43                 "pack-objects",
  44                 "--all-progress-implied",
  45                 "--revs",
  46                 "--stdout",
  47                 NULL,
  48                 NULL,
  49                 NULL,
  50                 NULL,
  51                 NULL,
  52         };
  53         struct child_process po;
  54         int i;
  55
  56         i = 4;
  57         if (args->use_thin_pack)
  58                 argv[i++] = "--thin";
  59         if (args->use_ofs_delta)
  60                 argv[i++] = "--delta-base-offset";
  61         if (args->quiet)
  62                 argv[i++] = "-q";
  63         if (args->progress)
  64                 argv[i++] = "--progress";
  65         memset(&po, 0, sizeof(po));
  66         po.argv = argv;
  67         po.in = -1;
  68         po.out = args->stateless_rpc ? -1 : fd;
  69         po.git_cmd = 1;
  70         if (start_command(&po))
  71                 die_errno("git pack-objects failed");
  72
  73         /*
  74          * We feed the pack-objects we just spawned with revision
  75          * parameters by writing to the pipe.
  76          */
  77         for (i = 0; i < extra->nr; i++)
  78                 if (!feed_object(extra->array[i], po.in, 1))
  79                         break;
  80
  81         while (refs) {
  82                 if (!is_null_sha1(refs->old_sha1) &&
  83                     !feed_object(refs->old_sha1, po.in, 1))
  84                         break;
  85                 if (!is_null_sha1(refs->new_sha1) &&
  86                     !feed_object(refs->new_sha1, po.in, 0))
  87                         break;
  88                 refs = refs->next;
  89         }
  90
  91         close(po.in);
  92
  93         if (args->stateless_rpc) {
  94                 char *buf = xmalloc(LARGE_PACKET_MAX);
  95                 while (1) {
  96                         ssize_t n = xread(po.out, buf, LARGE_PACKET_MAX);
  97                         if (n <= 0)
  98                                 break;
  99                         send_sideband(fd, -1, buf, n, LARGE_PACKET_MAX);
 100                 }
 101                 free(buf);
 102                 close(po.out);
 103                 po.out = -1;
 104         }
 105
 106         if (finish_command(&po))
 107                 return -1;
 108         return 0;
 109 }
 110
 111 static int receive_status(int in, struct ref *refs)
 112 {
 113         struct ref *hint;
 114         char line[1000];
 115         int ret = 0;
 116         int len = packet_read_line(in, line, sizeof(line));
 117         if (len < 10 || memcmp(line, "unpack ", 7))
 118                 return error("did not receive remote status");
 119         if (memcmp(line, "unpack ok\n", 10)) {
 120                 char *p = line + strlen(line) - 1;
 121                 if (*p == '\n')
 122                         *p = '\0';
 123                 error("unpack failed: %s", line + 7);
 124                 ret = -1;
 125         }
 126         hint = NULL;
 127         while (1) {
 128                 char *refname;
 129                 char *msg;
 130                 len = packet_read_line(in, line, sizeof(line));
 131                 if (!len)
 132                         break;
 133                 if (len < 3 ||
 134                     (memcmp(line, "ok ", 3) && memcmp(line, "ng ", 3))) {
 135                         fprintf(stderr, "protocol error: %s\n", line);
 136                         ret = -1;
 137                         break;
 138                 }
 139
 140                 line[strlen(line)-1] = '\0';
 141                 refname = line + 3;
 142                 msg = strchr(refname, ' ');
 143                 if (msg)
 144                         *msg++ = '\0';
 145
 146                 /* first try searching at our hint, falling back to all refs */
 147                 if (hint)
 148                         hint = find_ref_by_name(hint, refname);
 149                 if (!hint)
 150                         hint = find_ref_by_name(refs, refname);
 151                 if (!hint) {
 152                         warning("remote reported status on unknown ref: %s",
 153                                         refname);
 154                         continue;
 155                 }
 156                 if (hint->status != REF_STATUS_EXPECTING_REPORT) {
 157                         warning("remote reported status on unexpected ref: %s",
 158                                         refname);
 159                         continue;
 160                 }
 161
 162                 if (line[0] == 'o' && line[1] == 'k')
 163                         hint->status = REF_STATUS_OK;
 164                 else {
 165                         hint->status = REF_STATUS_REMOTE_REJECT;
 166                         ret = -1;
 167                 }
 168                 if (msg)
 169                         hint->remote_status = xstrdup(msg);
 170                 /* start our next search from the next ref */
 171                 hint = hint->next;
 172         }
 173         return ret;
 174 }
 175
 176 static void print_helper_status(struct ref *ref)
 177 {
 178         struct strbuf buf = STRBUF_INIT;
 179
 180         for (; ref; ref = ref->next) {
 181                 const char *msg = NULL;
 182                 const char *res;
 183
 184                 switch(ref->status) {
 185                 case REF_STATUS_NONE:
 186                         res = "error";
 187                         msg = "no match";
 188                         break;
 189
 190                 case REF_STATUS_OK:
 191                         res = "ok";
 192                         break;
 193
 194                 case REF_STATUS_UPTODATE:
 195                         res = "ok";
 196                         msg = "up to date";
 197                         break;
 198
 199                 case REF_STATUS_REJECT_NONFASTFORWARD:
 200                         res = "error";
 201                         msg = "non-fast forward";
 202                         break;
 203
 204                 case REF_STATUS_REJECT_NODELETE:
 205                 case REF_STATUS_REMOTE_REJECT:
 206                         res = "error";
 207                         break;
 208
 209                 case REF_STATUS_EXPECTING_REPORT:
 210                 default:
 211                         continue;
 212                 }
 213
 214                 strbuf_reset(&buf);
 215                 strbuf_addf(&buf, "%s %s", res, ref->name);
 216                 if (ref->remote_status)
 217                         msg = ref->remote_status;
 218                 if (msg) {
 219                         strbuf_addch(&buf, ' ');
 220                         quote_two_c_style(&buf, "", msg, 0);
 221                 }
 222                 strbuf_addch(&buf, '\n');
 223
 224                 safe_write(1, buf.buf, buf.len);
 225         }
 226         strbuf_release(&buf);
 227 }
 228
 229 static int sideband_demux(int in, int out, void *data)
 230 {
 231         int *fd = data;
 232         int ret = recv_sideband("send-pack", fd[0], out);
 233         close(out);
 234         return ret;
 235 }
 236
 237 int send_pack(struct send_pack_args *args,
 238               int fd[], struct child_process *conn,
 239               struct ref *remote_refs,
 240               struct extra_have_objects *extra_have)
 241 {
 242         int in = fd[0];
 243         int out = fd[1];
 244         struct strbuf req_buf = STRBUF_INIT;
 245         struct ref *ref;
 246         int new_refs;
 247         int allow_deleting_refs = 0;
 248         int status_report = 0;
 249         int use_sideband = 0;
 250         unsigned cmds_sent = 0;
 251         int ret;
 252         struct async demux;
 253
 254         /* Does the other end support the reporting? */
 255         if (server_supports("report-status"))
 256                 status_report = 1;
 257         if (server_supports("delete-refs"))
 258                 allow_deleting_refs = 1;
 259         if (server_supports("ofs-delta"))
 260                 args->use_ofs_delta = 1;
 261         if (server_supports("side-band-64k"))
 262                 use_sideband = 1;
 263
 264         if (!remote_refs) {
 265                 fprintf(stderr, "No refs in common and none specified; doing nothing.\n"
 266                         "Perhaps you should specify a branch such as 'master'.\n");
 267                 return 0;
 268         }
 269
 270         /*
 271          * Finally, tell the other end!
 272          */
 273         new_refs = 0;
 274         for (ref = remote_refs; ref; ref = ref->next) {
 275                 if (!ref->peer_ref && !args->send_mirror)
 276                         continue;
 277
 278                 /* Check for statuses set by set_ref_status_for_push() */
 279                 switch (ref->status) {
 280                 case REF_STATUS_REJECT_NONFASTFORWARD:
 281                 case REF_STATUS_UPTODATE:
 282                         continue;
 283                 default:
 284                         ; /* do nothing */
 285                 }
 286
 287                 if (ref->deletion && !allow_deleting_refs) {
 288                         ref->status = REF_STATUS_REJECT_NODELETE;
 289                         continue;
 290                 }
 291
 292                 if (!ref->deletion)
 293                         new_refs++;
 294
 295                 if (args->dry_run) {
 296                         ref->status = REF_STATUS_OK;
 297                 } else {
 298                         char *old_hex = sha1_to_hex(ref->old_sha1);
 299                         char *new_hex = sha1_to_hex(ref->new_sha1);
 300
 301                         if (!cmds_sent && (status_report || use_sideband)) {
 302                                 packet_buf_write(&req_buf, "%s %s %s%c%s%s",
 303                                         old_hex, new_hex, ref->name, 0,
 304                                         status_report ? " report-status" : "",
 305                                         use_sideband ? " side-band-64k" : "");
 306                         }
 307                         else
 308                                 packet_buf_write(&req_buf, "%s %s %s",
 309                                         old_hex, new_hex, ref->name);
 310                         ref->status = status_report ?
 311                                 REF_STATUS_EXPECTING_REPORT :
 312                                 REF_STATUS_OK;
 313                         cmds_sent++;
 314                 }
 315         }
 316
 317         if (args->stateless_rpc) {
 318                 if (!args->dry_run && cmds_sent) {
 319                         packet_buf_flush(&req_buf);
 320                         send_sideband(out, -1, req_buf.buf, req_buf.len, LARGE_PACKET_MAX);
 321                 }
 322         } else {
 323                 safe_write(out, req_buf.buf, req_buf.len);
 324                 packet_flush(out);
 325         }
 326         strbuf_release(&req_buf);
 327
 328         if (use_sideband && cmds_sent) {
 329                 memset(&demux, 0, sizeof(demux));
 330                 demux.proc = sideband_demux;
 331                 demux.data = fd;
 332                 demux.out = -1;
 333                 if (start_async(&demux))
 334                         die("receive-pack: unable to fork off sideband demultiplexer");
 335                 in = demux.out;
 336         }
 337
 338         if (new_refs && cmds_sent) {
 339                 if (pack_objects(out, remote_refs, extra_have, args) < 0) {
 340                         for (ref = remote_refs; ref; ref = ref->next)
 341                                 ref->status = REF_STATUS_NONE;
 342                         if (use_sideband)
 343                                 finish_async(&demux);
 344                         return -1;
 345                 }
 346         }
 347         if (args->stateless_rpc && cmds_sent)
 348                 packet_flush(out);
 349
 350         if (status_report && cmds_sent)
 351                 ret = receive_status(in, remote_refs);
 352         else
 353                 ret = 0;
 354         if (args->stateless_rpc)
 355                 packet_flush(out);
 356
 357         if (use_sideband && cmds_sent) {
 358                 if (finish_async(&demux)) {
 359                         error("error in sideband demultiplexer");
 360                         ret = -1;
 361                 }
 362                 close(demux.out);
 363         }
 364
 365         if (ret < 0)
 366                 return ret;
 367
 368         if (args->porcelain)
 369                 return 0;
 370
 371         for (ref = remote_refs; ref; ref = ref->next) {
 372                 switch (ref->status) {
 373                 case REF_STATUS_NONE:
 374                 case REF_STATUS_UPTODATE:
 375                 case REF_STATUS_OK:
 376                         break;
 377                 default:
 378                         return -1;
 379                 }
 380         }
 381         return 0;
 382 }
 383
 384 int cmd_send_pack(int argc, const char **argv, const char *prefix)
 385 {
 386         int i, nr_refspecs = 0;
 387         const char **refspecs = NULL;
 388         const char *remote_name = NULL;
 389         struct remote *remote = NULL;
 390         const char *dest = NULL;
 391         int fd[2];
 392         struct child_process *conn;
 393         struct extra_have_objects extra_have;
 394         struct ref *remote_refs, *local_refs;
 395         int ret;
 396         int helper_status = 0;
 397         int send_all = 0;
 398         const char *receivepack = "git-receive-pack";
 399         int flags;
 400         int nonfastforward = 0;
 401
 402         argv++;
 403         for (i = 1; i < argc; i++, argv++) {
 404                 const char *arg = *argv;
 405
 406                 if (*arg == '-') {
 407                         if (!prefixcmp(arg, "--receive-pack=")) {
 408                                 receivepack = arg + 15;
 409                                 continue;
 410                         }
 411                         if (!prefixcmp(arg, "--exec=")) {
 412                                 receivepack = arg + 7;
 413                                 continue;
 414                         }
 415                         if (!prefixcmp(arg, "--remote=")) {
 416                                 remote_name = arg + 9;
 417                                 continue;
 418                         }
 419                         if (!strcmp(arg, "--all")) {
 420                                 send_all = 1;
 421                                 continue;
 422                         }
 423                         if (!strcmp(arg, "--dry-run")) {
 424                                 args.dry_run = 1;
 425                                 continue;
 426                         }
 427                         if (!strcmp(arg, "--mirror")) {
 428                                 args.send_mirror = 1;
 429                                 continue;
 430                         }
 431                         if (!strcmp(arg, "--force")) {
 432                                 args.force_update = 1;
 433                                 continue;
 434                         }
 435                         if (!strcmp(arg, "--verbose")) {
 436                                 args.verbose = 1;
 437                                 continue;
 438                         }
 439                         if (!strcmp(arg, "--thin")) {
 440                                 args.use_thin_pack = 1;
 441                                 continue;
 442                         }
 443                         if (!strcmp(arg, "--stateless-rpc")) {
 444                                 args.stateless_rpc = 1;
 445                                 continue;
 446                         }
 447                         if (!strcmp(arg, "--helper-status")) {
 448                                 helper_status = 1;
 449                                 continue;
 450                         }
 451                         usage(send_pack_usage);
 452                 }
 453                 if (!dest) {
 454                         dest = arg;
 455                         continue;
 456                 }
 457                 refspecs = (const char **) argv;
 458                 nr_refspecs = argc - i;
 459                 break;
 460         }
 461         if (!dest)
 462                 usage(send_pack_usage);
 463         /*
 464          * --all and --mirror are incompatible; neither makes sense
 465          * with any refspecs.
 466          */
 467         if ((refspecs && (send_all || args.send_mirror)) ||
 468             (send_all && args.send_mirror))
 469                 usage(send_pack_usage);
 470
 471         if (remote_name) {
 472                 remote = remote_get(remote_name);
 473                 if (!remote_has_url(remote, dest)) {
 474                         die("Destination %s is not a uri for %s",
 475                             dest, remote_name);
 476                 }
 477         }
 478
 479         if (args.stateless_rpc) {
 480                 conn = NULL;
 481                 fd[0] = 0;
 482                 fd[1] = 1;
 483         } else {
 484                 conn = git_connect(fd, dest, receivepack,
 485                         args.verbose ? CONNECT_VERBOSE : 0);
 486         }
 487
 488         memset(&extra_have, 0, sizeof(extra_have));
 489
 490         get_remote_heads(fd[0], &remote_refs, 0, NULL, REF_NORMAL,
 491                          &extra_have);
 492
 493         transport_verify_remote_names(nr_refspecs, refspecs);
 494
 495         local_refs = get_local_heads();
 496
 497         flags = MATCH_REFS_NONE;
 498
 499         if (send_all)
 500                 flags |= MATCH_REFS_ALL;
 501         if (args.send_mirror)
 502                 flags |= MATCH_REFS_MIRROR;
 503
 504         /* match them up */
 505         if (match_refs(local_refs, &remote_refs, nr_refspecs, refspecs, flags))
 506                 return -1;
 507
 508         set_ref_status_for_push(remote_refs, args.send_mirror,
 509                 args.force_update);
 510
 511         ret = send_pack(&args, fd, conn, remote_refs, &extra_have);
 512
 513         if (helper_status)
 514                 print_helper_status(remote_refs);
 515
 516         close(fd[1]);
 517         close(fd[0]);
 518
 519         ret |= finish_connect(conn);
 520
 521         if (!helper_status)
 522                 transport_print_push_status(dest, remote_refs, args.verbose, 0, &nonfastforward);
 523
 524         if (!args.dry_run && remote) {
 525                 struct ref *ref;
 526                 for (ref = remote_refs; ref; ref = ref->next)
 527                         transport_update_tracking_ref(remote, ref, args.verbose);
 528         }
 529
 530         if (!ret && !transport_refs_pushed(remote_refs))
 531                 fprintf(stderr, "Everything up-to-date\n");
 532
 533         return ret;
 534 }