send-pack.c

   1 #include "builtin.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 "connect.h"
   9 #include "send-pack.h"
  10 #include "quote.h"
  11 #include "transport.h"
  12 #include "version.h"
  13 #include "sha1-array.h"
  14 #include "gpg-interface.h"
  15 #include "cache.h"
  16
  17 int option_parse_push_signed(const struct option *opt,
  18                              const char *arg, int unset)
  19 {
  20         if (unset) {
  21                 *(int *)(opt->value) = SEND_PACK_PUSH_CERT_NEVER;
  22                 return 0;
  23         }
  24         switch (git_parse_maybe_bool(arg)) {
  25         case 1:
  26                 *(int *)(opt->value) = SEND_PACK_PUSH_CERT_ALWAYS;
  27                 return 0;
  28         case 0:
  29                 *(int *)(opt->value) = SEND_PACK_PUSH_CERT_NEVER;
  30                 return 0;
  31         }
  32         if (!strcasecmp("if-asked", arg)) {
  33                 *(int *)(opt->value) = SEND_PACK_PUSH_CERT_IF_ASKED;
  34                 return 0;
  35         }
  36         die("bad %s argument: %s", opt->long_name, arg);
  37 }
  38
  39 static void feed_object(const unsigned char *sha1, FILE *fh, int negative)
  40 {
  41         if (negative && !has_sha1_file(sha1))
  42                 return;
  43
  44         if (negative)
  45                 putc('^', fh);
  46         fputs(sha1_to_hex(sha1), fh);
  47         putc('\n', fh);
  48 }
  49
  50 /*
  51  * Make a pack stream and spit it out into file descriptor fd
  52  */
  53 static int pack_objects(int fd, struct ref *refs, struct sha1_array *extra, struct send_pack_args *args)
  54 {
  55         /*
  56          * The child becomes pack-objects --revs; we feed
  57          * the revision parameters to it via its stdin and
  58          * let its stdout go back to the other end.
  59          */
  60         const char *argv[] = {
  61                 "pack-objects",
  62                 "--all-progress-implied",
  63                 "--revs",
  64                 "--stdout",
  65                 NULL,
  66                 NULL,
  67                 NULL,
  68                 NULL,
  69                 NULL,
  70                 NULL,
  71         };
  72         struct child_process po = CHILD_PROCESS_INIT;
  73         FILE *po_in;
  74         int i;
  75
  76         i = 4;
  77         if (args->use_thin_pack)
  78                 argv[i++] = "--thin";
  79         if (args->use_ofs_delta)
  80                 argv[i++] = "--delta-base-offset";
  81         if (args->quiet || !args->progress)
  82                 argv[i++] = "-q";
  83         if (args->progress)
  84                 argv[i++] = "--progress";
  85         if (is_repository_shallow())
  86                 argv[i++] = "--shallow";
  87         po.argv = argv;
  88         po.in = -1;
  89         po.out = args->stateless_rpc ? -1 : fd;
  90         po.git_cmd = 1;
  91         if (start_command(&po))
  92                 die_errno("git pack-objects failed");
  93
  94         /*
  95          * We feed the pack-objects we just spawned with revision
  96          * parameters by writing to the pipe.
  97          */
  98         po_in = xfdopen(po.in, "w");
  99         for (i = 0; i < extra->nr; i++)
 100                 feed_object(extra->sha1[i], po_in, 1);
 101
 102         while (refs) {
 103                 if (!is_null_oid(&refs->old_oid))
 104                         feed_object(refs->old_oid.hash, po_in, 1);
 105                 if (!is_null_oid(&refs->new_oid))
 106                         feed_object(refs->new_oid.hash, po_in, 0);
 107                 refs = refs->next;
 108         }
 109
 110         fflush(po_in);
 111         if (ferror(po_in))
 112                 die_errno("error writing to pack-objects");
 113         fclose(po_in);
 114
 115         if (args->stateless_rpc) {
 116                 char *buf = xmalloc(LARGE_PACKET_MAX);
 117                 while (1) {
 118                         ssize_t n = xread(po.out, buf, LARGE_PACKET_MAX);
 119                         if (n <= 0)
 120                                 break;
 121                         send_sideband(fd, -1, buf, n, LARGE_PACKET_MAX);
 122                 }
 123                 free(buf);
 124                 close(po.out);
 125                 po.out = -1;
 126         }
 127
 128         if (finish_command(&po))
 129                 return -1;
 130         return 0;
 131 }
 132
 133 static int receive_unpack_status(int in)
 134 {
 135         const char *line = packet_read_line(in, NULL);
 136         if (!skip_prefix(line, "unpack ", &line))
 137                 return error("did not receive remote status");
 138         if (strcmp(line, "ok"))
 139                 return error("unpack failed: %s", line);
 140         return 0;
 141 }
 142
 143 static int receive_status(int in, struct ref *refs)
 144 {
 145         struct ref *hint;
 146         int ret;
 147
 148         hint = NULL;
 149         ret = receive_unpack_status(in);
 150         while (1) {
 151                 char *refname;
 152                 char *msg;
 153                 char *line = packet_read_line(in, NULL);
 154                 if (!line)
 155                         break;
 156                 if (!starts_with(line, "ok ") && !starts_with(line, "ng ")) {
 157                         error("invalid ref status from remote: %s", line);
 158                         ret = -1;
 159                         break;
 160                 }
 161
 162                 refname = line + 3;
 163                 msg = strchr(refname, ' ');
 164                 if (msg)
 165                         *msg++ = '\0';
 166
 167                 /* first try searching at our hint, falling back to all refs */
 168                 if (hint)
 169                         hint = find_ref_by_name(hint, refname);
 170                 if (!hint)
 171                         hint = find_ref_by_name(refs, refname);
 172                 if (!hint) {
 173                         warning("remote reported status on unknown ref: %s",
 174                                         refname);
 175                         continue;
 176                 }
 177                 if (hint->status != REF_STATUS_EXPECTING_REPORT) {
 178                         warning("remote reported status on unexpected ref: %s",
 179                                         refname);
 180                         continue;
 181                 }
 182
 183                 if (line[0] == 'o' && line[1] == 'k')
 184                         hint->status = REF_STATUS_OK;
 185                 else {
 186                         hint->status = REF_STATUS_REMOTE_REJECT;
 187                         ret = -1;
 188                 }
 189                 hint->remote_status = xstrdup_or_null(msg);
 190                 /* start our next search from the next ref */
 191                 hint = hint->next;
 192         }
 193         return ret;
 194 }
 195
 196 static int sideband_demux(int in, int out, void *data)
 197 {
 198         int *fd = data, ret;
 199 #ifdef NO_PTHREADS
 200         close(fd[1]);
 201 #endif
 202         ret = recv_sideband("send-pack", fd[0], out);
 203         close(out);
 204         return ret;
 205 }
 206
 207 static int advertise_shallow_grafts_cb(const struct commit_graft *graft, void *cb)
 208 {
 209         struct strbuf *sb = cb;
 210         if (graft->nr_parent == -1)
 211                 packet_buf_write(sb, "shallow %s\n", oid_to_hex(&graft->oid));
 212         return 0;
 213 }
 214
 215 static void advertise_shallow_grafts_buf(struct strbuf *sb)
 216 {
 217         if (!is_repository_shallow())
 218                 return;
 219         for_each_commit_graft(advertise_shallow_grafts_cb, sb);
 220 }
 221
 222 #define CHECK_REF_NO_PUSH -1
 223 #define CHECK_REF_STATUS_REJECTED -2
 224 #define CHECK_REF_UPTODATE -3
 225 static int check_to_send_update(const struct ref *ref, const struct send_pack_args *args)
 226 {
 227         if (!ref->peer_ref && !args->send_mirror)
 228                 return CHECK_REF_NO_PUSH;
 229
 230         /* Check for statuses set by set_ref_status_for_push() */
 231         switch (ref->status) {
 232         case REF_STATUS_REJECT_NONFASTFORWARD:
 233         case REF_STATUS_REJECT_ALREADY_EXISTS:
 234         case REF_STATUS_REJECT_FETCH_FIRST:
 235         case REF_STATUS_REJECT_NEEDS_FORCE:
 236         case REF_STATUS_REJECT_STALE:
 237         case REF_STATUS_REJECT_NODELETE:
 238                 return CHECK_REF_STATUS_REJECTED;
 239         case REF_STATUS_UPTODATE:
 240                 return CHECK_REF_UPTODATE;
 241         default:
 242                 return 0;
 243         }
 244 }
 245
 246 /*
 247  * the beginning of the next line, or the end of buffer.
 248  *
 249  * NEEDSWORK: perhaps move this to git-compat-util.h or somewhere and
 250  * convert many similar uses found by "git grep -A4 memchr".
 251  */
 252 static const char *next_line(const char *line, size_t len)
 253 {
 254         const char *nl = memchr(line, '\n', len);
 255         if (!nl)
 256                 return line + len; /* incomplete line */
 257         return nl + 1;
 258 }
 259
 260 static int generate_push_cert(struct strbuf *req_buf,
 261                               const struct ref *remote_refs,
 262                               struct send_pack_args *args,
 263                               const char *cap_string,
 264                               const char *push_cert_nonce)
 265 {
 266         const struct ref *ref;
 267         struct string_list_item *item;
 268         char *signing_key = xstrdup(get_signing_key());
 269         const char *cp, *np;
 270         struct strbuf cert = STRBUF_INIT;
 271         int update_seen = 0;
 272
 273         strbuf_addstr(&cert, "certificate version 0.1\n");
 274         strbuf_addf(&cert, "pusher %s ", signing_key);
 275         datestamp(&cert);
 276         strbuf_addch(&cert, '\n');
 277         if (args->url && *args->url) {
 278                 char *anon_url = transport_anonymize_url(args->url);
 279                 strbuf_addf(&cert, "pushee %s\n", anon_url);
 280                 free(anon_url);
 281         }
 282         if (push_cert_nonce[0])
 283                 strbuf_addf(&cert, "nonce %s\n", push_cert_nonce);
 284         if (args->push_options)
 285                 for_each_string_list_item(item, args->push_options)
 286                         strbuf_addf(&cert, "push-option %s\n", item->string);
 287         strbuf_addstr(&cert, "\n");
 288
 289         for (ref = remote_refs; ref; ref = ref->next) {
 290                 if (check_to_send_update(ref, args) < 0)
 291                         continue;
 292                 update_seen = 1;
 293                 strbuf_addf(&cert, "%s %s %s\n",
 294                             oid_to_hex(&ref->old_oid),
 295                             oid_to_hex(&ref->new_oid),
 296                             ref->name);
 297         }
 298         if (!update_seen)
 299                 goto free_return;
 300
 301         if (sign_buffer(&cert, &cert, signing_key))
 302                 die(_("failed to sign the push certificate"));
 303
 304         packet_buf_write(req_buf, "push-cert%c%s", 0, cap_string);
 305         for (cp = cert.buf; cp < cert.buf + cert.len; cp = np) {
 306                 np = next_line(cp, cert.buf + cert.len - cp);
 307                 packet_buf_write(req_buf,
 308                                  "%.*s", (int)(np - cp), cp);
 309         }
 310         packet_buf_write(req_buf, "push-cert-end\n");
 311
 312 free_return:
 313         free(signing_key);
 314         strbuf_release(&cert);
 315         return update_seen;
 316 }
 317
 318
 319 static int atomic_push_failure(struct send_pack_args *args,
 320                                struct ref *remote_refs,
 321                                struct ref *failing_ref)
 322 {
 323         struct ref *ref;
 324         /* Mark other refs as failed */
 325         for (ref = remote_refs; ref; ref = ref->next) {
 326                 if (!ref->peer_ref && !args->send_mirror)
 327                         continue;
 328
 329                 switch (ref->status) {
 330                 case REF_STATUS_EXPECTING_REPORT:
 331                         ref->status = REF_STATUS_ATOMIC_PUSH_FAILED;
 332                         continue;
 333                 default:
 334                         break; /* do nothing */
 335                 }
 336         }
 337         return error("atomic push failed for ref %s. status: %d\n",
 338                      failing_ref->name, failing_ref->status);
 339 }
 340
 341 #define NONCE_LEN_LIMIT 256
 342
 343 static void reject_invalid_nonce(const char *nonce, int len)
 344 {
 345         int i = 0;
 346
 347         if (NONCE_LEN_LIMIT <= len)
 348                 die("the receiving end asked to sign an invalid nonce <%.*s>",
 349                     len, nonce);
 350
 351         for (i = 0; i < len; i++) {
 352                 int ch = nonce[i] & 0xFF;
 353                 if (isalnum(ch) ||
 354                     ch == '-' || ch == '.' ||
 355                     ch == '/' || ch == '+' ||
 356                     ch == '=' || ch == '_')
 357                         continue;
 358                 die("the receiving end asked to sign an invalid nonce <%.*s>",
 359                     len, nonce);
 360         }
 361 }
 362
 363 int send_pack(struct send_pack_args *args,
 364               int fd[], struct child_process *conn,
 365               struct ref *remote_refs,
 366               struct sha1_array *extra_have)
 367 {
 368         int in = fd[0];
 369         int out = fd[1];
 370         struct strbuf req_buf = STRBUF_INIT;
 371         struct strbuf cap_buf = STRBUF_INIT;
 372         struct ref *ref;
 373         int need_pack_data = 0;
 374         int allow_deleting_refs = 0;
 375         int status_report = 0;
 376         int use_sideband = 0;
 377         int quiet_supported = 0;
 378         int agent_supported = 0;
 379         int use_atomic = 0;
 380         int atomic_supported = 0;
 381         int use_push_options = 0;
 382         int push_options_supported = 0;
 383         unsigned cmds_sent = 0;
 384         int ret;
 385         struct async demux;
 386         const char *push_cert_nonce = NULL;
 387
 388         /* Does the other end support the reporting? */
 389         if (server_supports("report-status"))
 390                 status_report = 1;
 391         if (server_supports("delete-refs"))
 392                 allow_deleting_refs = 1;
 393         if (server_supports("ofs-delta"))
 394                 args->use_ofs_delta = 1;
 395         if (server_supports("side-band-64k"))
 396                 use_sideband = 1;
 397         if (server_supports("quiet"))
 398                 quiet_supported = 1;
 399         if (server_supports("agent"))
 400                 agent_supported = 1;
 401         if (server_supports("no-thin"))
 402                 args->use_thin_pack = 0;
 403         if (server_supports("atomic"))
 404                 atomic_supported = 1;
 405         if (server_supports("push-options"))
 406                 push_options_supported = 1;
 407
 408         if (args->push_cert != SEND_PACK_PUSH_CERT_NEVER) {
 409                 int len;
 410                 push_cert_nonce = server_feature_value("push-cert", &len);
 411                 if (push_cert_nonce) {
 412                         reject_invalid_nonce(push_cert_nonce, len);
 413                         push_cert_nonce = xmemdupz(push_cert_nonce, len);
 414                 } else if (args->push_cert == SEND_PACK_PUSH_CERT_ALWAYS) {
 415                         die(_("the receiving end does not support --signed push"));
 416                 } else if (args->push_cert == SEND_PACK_PUSH_CERT_IF_ASKED) {
 417                         warning(_("not sending a push certificate since the"
 418                                   " receiving end does not support --signed"
 419                                   " push"));
 420                 }
 421         }
 422
 423         if (!remote_refs) {
 424                 fprintf(stderr, "No refs in common and none specified; doing nothing.\n"
 425                         "Perhaps you should specify a branch such as 'master'.\n");
 426                 return 0;
 427         }
 428         if (args->atomic && !atomic_supported)
 429                 die(_("the receiving end does not support --atomic push"));
 430
 431         use_atomic = atomic_supported && args->atomic;
 432
 433         if (args->push_options && !push_options_supported)
 434                 die(_("the receiving end does not support push options"));
 435
 436         use_push_options = push_options_supported && args->push_options;
 437
 438         if (status_report)
 439                 strbuf_addstr(&cap_buf, " report-status");
 440         if (use_sideband)
 441                 strbuf_addstr(&cap_buf, " side-band-64k");
 442         if (quiet_supported && (args->quiet || !args->progress))
 443                 strbuf_addstr(&cap_buf, " quiet");
 444         if (use_atomic)
 445                 strbuf_addstr(&cap_buf, " atomic");
 446         if (use_push_options)
 447                 strbuf_addstr(&cap_buf, " push-options");
 448         if (agent_supported)
 449                 strbuf_addf(&cap_buf, " agent=%s", git_user_agent_sanitized());
 450
 451         /*
 452          * NEEDSWORK: why does delete-refs have to be so specific to
 453          * send-pack machinery that set_ref_status_for_push() cannot
 454          * set this bit for us???
 455          */
 456         for (ref = remote_refs; ref; ref = ref->next)
 457                 if (ref->deletion && !allow_deleting_refs)
 458                         ref->status = REF_STATUS_REJECT_NODELETE;
 459
 460         if (!args->dry_run)
 461                 advertise_shallow_grafts_buf(&req_buf);
 462
 463         if (!args->dry_run && push_cert_nonce)
 464                 cmds_sent = generate_push_cert(&req_buf, remote_refs, args,
 465                                                cap_buf.buf, push_cert_nonce);
 466
 467         /*
 468          * Clear the status for each ref and see if we need to send
 469          * the pack data.
 470          */
 471         for (ref = remote_refs; ref; ref = ref->next) {
 472                 switch (check_to_send_update(ref, args)) {
 473                 case 0: /* no error */
 474                         break;
 475                 case CHECK_REF_STATUS_REJECTED:
 476                         /*
 477                          * When we know the server would reject a ref update if
 478                          * we were to send it and we're trying to send the refs
 479                          * atomically, abort the whole operation.
 480                          */
 481                         if (use_atomic)
 482                                 return atomic_push_failure(args, remote_refs, ref);
 483                         /* Fallthrough for non atomic case. */
 484                 default:
 485                         continue;
 486                 }
 487                 if (!ref->deletion)
 488                         need_pack_data = 1;
 489
 490                 if (args->dry_run || !status_report)
 491                         ref->status = REF_STATUS_OK;
 492                 else
 493                         ref->status = REF_STATUS_EXPECTING_REPORT;
 494         }
 495
 496         /*
 497          * Finally, tell the other end!
 498          */
 499         for (ref = remote_refs; ref; ref = ref->next) {
 500                 char *old_hex, *new_hex;
 501
 502                 if (args->dry_run || push_cert_nonce)
 503                         continue;
 504
 505                 if (check_to_send_update(ref, args) < 0)
 506                         continue;
 507
 508                 old_hex = oid_to_hex(&ref->old_oid);
 509                 new_hex = oid_to_hex(&ref->new_oid);
 510                 if (!cmds_sent) {
 511                         packet_buf_write(&req_buf,
 512                                          "%s %s %s%c%s",
 513                                          old_hex, new_hex, ref->name, 0,
 514                                          cap_buf.buf);
 515                         cmds_sent = 1;
 516                 } else {
 517                         packet_buf_write(&req_buf, "%s %s %s",
 518                                          old_hex, new_hex, ref->name);
 519                 }
 520         }
 521
 522         if (args->stateless_rpc) {
 523                 if (!args->dry_run && (cmds_sent || is_repository_shallow())) {
 524                         packet_buf_flush(&req_buf);
 525                         send_sideband(out, -1, req_buf.buf, req_buf.len, LARGE_PACKET_MAX);
 526                 }
 527         } else {
 528                 write_or_die(out, req_buf.buf, req_buf.len);
 529                 packet_flush(out);
 530         }
 531         strbuf_release(&req_buf);
 532         strbuf_release(&cap_buf);
 533
 534         if (use_push_options) {
 535                 struct string_list_item *item;
 536                 struct strbuf sb = STRBUF_INIT;
 537
 538                 for_each_string_list_item(item, args->push_options)
 539                         packet_buf_write(&sb, "%s", item->string);
 540
 541                 write_or_die(out, sb.buf, sb.len);
 542                 packet_flush(out);
 543                 strbuf_release(&sb);
 544         }
 545
 546         if (use_sideband && cmds_sent) {
 547                 memset(&demux, 0, sizeof(demux));
 548                 demux.proc = sideband_demux;
 549                 demux.data = fd;
 550                 demux.out = -1;
 551                 demux.isolate_sigpipe = 1;
 552                 if (start_async(&demux))
 553                         die("send-pack: unable to fork off sideband demultiplexer");
 554                 in = demux.out;
 555         }
 556
 557         if (need_pack_data && cmds_sent) {
 558                 if (pack_objects(out, remote_refs, extra_have, args) < 0) {
 559                         for (ref = remote_refs; ref; ref = ref->next)
 560                                 ref->status = REF_STATUS_NONE;
 561                         if (args->stateless_rpc)
 562                                 close(out);
 563                         if (git_connection_is_socket(conn))
 564                                 shutdown(fd[0], SHUT_WR);
 565                         if (use_sideband) {
 566                                 close(demux.out);
 567                                 finish_async(&demux);
 568                         }
 569                         fd[1] = -1;
 570                         return -1;
 571                 }
 572                 if (!args->stateless_rpc)
 573                         /* Closed by pack_objects() via start_command() */
 574                         fd[1] = -1;
 575         }
 576         if (args->stateless_rpc && cmds_sent)
 577                 packet_flush(out);
 578
 579         if (status_report && cmds_sent)
 580                 ret = receive_status(in, remote_refs);
 581         else
 582                 ret = 0;
 583         if (args->stateless_rpc)
 584                 packet_flush(out);
 585
 586         if (use_sideband && cmds_sent) {
 587                 close(demux.out);
 588                 if (finish_async(&demux)) {
 589                         error("error in sideband demultiplexer");
 590                         ret = -1;
 591                 }
 592         }
 593
 594         if (ret < 0)
 595                 return ret;
 596
 597         if (args->porcelain)
 598                 return 0;
 599
 600         for (ref = remote_refs; ref; ref = ref->next) {
 601                 switch (ref->status) {
 602                 case REF_STATUS_NONE:
 603                 case REF_STATUS_UPTODATE:
 604                 case REF_STATUS_OK:
 605                         break;
 606                 default:
 607                         return -1;
 608                 }
 609         }
 610         return 0;
 611 }