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