git.oblomov.eu Git - git/blob - 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
  16 static int feed_object(const unsigned char *sha1, int fd, int negative)
  17 {
  18         char buf[42];
  19
  20         if (negative && !has_sha1_file(sha1))
  21                 return 1;
  22
  23         memcpy(buf + negative, sha1_to_hex(sha1), 40);
  24         if (negative)
  25                 buf[0] = '^';
  26         buf[40 + negative] = '\n';
  27         return write_or_whine(fd, buf, 41 + negative, "send-pack: send refs");
  28 }
  29
  30 /*
  31  * Make a pack stream and spit it out into file descriptor fd
  32  */
  33 static int pack_objects(int fd, struct ref *refs, struct sha1_array *extra, struct send_pack_args *args)
  34 {
  35         /*
  36          * The child becomes pack-objects --revs; we feed
  37          * the revision parameters to it via its stdin and
  38          * let its stdout go back to the other end.
  39          */
  40         const char *argv[] = {
  41                 "pack-objects",
  42                 "--all-progress-implied",
  43                 "--revs",
  44                 "--stdout",
  45                 NULL,
  46                 NULL,
  47                 NULL,
  48                 NULL,
  49                 NULL,
  50         };
  51         struct child_process po = CHILD_PROCESS_INIT;
  52         int i;
  53
  54         i = 4;
  55         if (args->use_thin_pack)
  56                 argv[i++] = "--thin";
  57         if (args->use_ofs_delta)
  58                 argv[i++] = "--delta-base-offset";
  59         if (args->quiet || !args->progress)
  60                 argv[i++] = "-q";
  61         if (args->progress)
  62                 argv[i++] = "--progress";
  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->sha1[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 -1;
 105         return 0;
 106 }
 107
 108 static int receive_status(int in, struct ref *refs)
 109 {
 110         struct ref *hint;
 111         int ret = 0;
 112         char *line = packet_read_line(in, NULL);
 113         if (!starts_with(line, "unpack "))
 114                 return error("did not receive remote status");
 115         if (strcmp(line, "unpack ok")) {
 116                 error("unpack failed: %s", line + 7);
 117                 ret = -1;
 118         }
 119         hint = NULL;
 120         while (1) {
 121                 char *refname;
 122                 char *msg;
 123                 line = packet_read_line(in, NULL);
 124                 if (!line)
 125                         break;
 126                 if (!starts_with(line, "ok ") && !starts_with(line, "ng ")) {
 127                         error("invalid ref status from remote: %s", line);
 128                         ret = -1;
 129                         break;
 130                 }
 131
 132                 refname = line + 3;
 133                 msg = strchr(refname, ' ');
 134                 if (msg)
 135                         *msg++ = '\0';
 136
 137                 /* first try searching at our hint, falling back to all refs */
 138                 if (hint)
 139                         hint = find_ref_by_name(hint, refname);
 140                 if (!hint)
 141                         hint = find_ref_by_name(refs, refname);
 142                 if (!hint) {
 143                         warning("remote reported status on unknown ref: %s",
 144                                         refname);
 145                         continue;
 146                 }
 147                 if (hint->status != REF_STATUS_EXPECTING_REPORT) {
 148                         warning("remote reported status on unexpected ref: %s",
 149                                         refname);
 150                         continue;
 151                 }
 152
 153                 if (line[0] == 'o' && line[1] == 'k')
 154                         hint->status = REF_STATUS_OK;
 155                 else {
 156                         hint->status = REF_STATUS_REMOTE_REJECT;
 157                         ret = -1;
 158                 }
 159                 if (msg)
 160                         hint->remote_status = xstrdup(msg);
 161                 /* start our next search from the next ref */
 162                 hint = hint->next;
 163         }
 164         return ret;
 165 }
 166
 167 static int sideband_demux(int in, int out, void *data)
 168 {
 169         int *fd = data, ret;
 170 #ifdef NO_PTHREADS
 171         close(fd[1]);
 172 #endif
 173         ret = recv_sideband("send-pack", fd[0], out);
 174         close(out);
 175         return ret;
 176 }
 177
 178 static int advertise_shallow_grafts_cb(const struct commit_graft *graft, void *cb)
 179 {
 180         struct strbuf *sb = cb;
 181         if (graft->nr_parent == -1)
 182                 packet_buf_write(sb, "shallow %s\n", sha1_to_hex(graft->sha1));
 183         return 0;
 184 }
 185
 186 static void advertise_shallow_grafts_buf(struct strbuf *sb)
 187 {
 188         if (!is_repository_shallow())
 189                 return;
 190         for_each_commit_graft(advertise_shallow_grafts_cb, sb);
 191 }
 192
 193 #define CHECK_REF_NO_PUSH -1
 194 #define CHECK_REF_STATUS_REJECTED -2
 195 #define CHECK_REF_UPTODATE -3
 196 static int check_to_send_update(const struct ref *ref, const struct send_pack_args *args)
 197 {
 198         if (!ref->peer_ref && !args->send_mirror)
 199                 return CHECK_REF_NO_PUSH;
 200
 201         /* Check for statuses set by set_ref_status_for_push() */
 202         switch (ref->status) {
 203         case REF_STATUS_REJECT_NONFASTFORWARD:
 204         case REF_STATUS_REJECT_ALREADY_EXISTS:
 205         case REF_STATUS_REJECT_FETCH_FIRST:
 206         case REF_STATUS_REJECT_NEEDS_FORCE:
 207         case REF_STATUS_REJECT_STALE:
 208         case REF_STATUS_REJECT_NODELETE:
 209                 return CHECK_REF_STATUS_REJECTED;
 210         case REF_STATUS_UPTODATE:
 211                 return CHECK_REF_UPTODATE;
 212         default:
 213                 return 0;
 214         }
 215 }
 216
 217 /*
 218  * the beginning of the next line, or the end of buffer.
 219  *
 220  * NEEDSWORK: perhaps move this to git-compat-util.h or somewhere and
 221  * convert many similar uses found by "git grep -A4 memchr".
 222  */
 223 static const char *next_line(const char *line, size_t len)
 224 {
 225         const char *nl = memchr(line, '\n', len);
 226         if (!nl)
 227                 return line + len; /* incomplete line */
 228         return nl + 1;
 229 }
 230
 231 static int generate_push_cert(struct strbuf *req_buf,
 232                               const struct ref *remote_refs,
 233                               struct send_pack_args *args,
 234                               const char *cap_string,
 235                               const char *push_cert_nonce)
 236 {
 237         const struct ref *ref;
 238         char *signing_key = xstrdup(get_signing_key());
 239         const char *cp, *np;
 240         struct strbuf cert = STRBUF_INIT;
 241         int update_seen = 0;
 242
 243         strbuf_addf(&cert, "certificate version 0.1\n");
 244         strbuf_addf(&cert, "pusher %s ", signing_key);
 245         datestamp(&cert);
 246         strbuf_addch(&cert, '\n');
 247         if (args->url && *args->url) {
 248                 char *anon_url = transport_anonymize_url(args->url);
 249                 strbuf_addf(&cert, "pushee %s\n", anon_url);
 250                 free(anon_url);
 251         }
 252         if (push_cert_nonce[0])
 253                 strbuf_addf(&cert, "nonce %s\n", push_cert_nonce);
 254         strbuf_addstr(&cert, "\n");
 255
 256         for (ref = remote_refs; ref; ref = ref->next) {
 257                 if (check_to_send_update(ref, args) < 0)
 258                         continue;
 259                 update_seen = 1;
 260                 strbuf_addf(&cert, "%s %s %s\n",
 261                             sha1_to_hex(ref->old_sha1),
 262                             sha1_to_hex(ref->new_sha1),
 263                             ref->name);
 264         }
 265         if (!update_seen)
 266                 goto free_return;
 267
 268         if (sign_buffer(&cert, &cert, signing_key))
 269                 die(_("failed to sign the push certificate"));
 270
 271         packet_buf_write(req_buf, "push-cert%c%s", 0, cap_string);
 272         for (cp = cert.buf; cp < cert.buf + cert.len; cp = np) {
 273                 np = next_line(cp, cert.buf + cert.len - cp);
 274                 packet_buf_write(req_buf,
 275                                  "%.*s", (int)(np - cp), cp);
 276         }
 277         packet_buf_write(req_buf, "push-cert-end\n");
 278
 279 free_return:
 280         free(signing_key);
 281         strbuf_release(&cert);
 282         return update_seen;
 283 }
 284
 285
 286 static int atomic_push_failure(struct send_pack_args *args,
 287                                struct ref *remote_refs,
 288                                struct ref *failing_ref)
 289 {
 290         struct ref *ref;
 291         /* Mark other refs as failed */
 292         for (ref = remote_refs; ref; ref = ref->next) {
 293                 if (!ref->peer_ref && !args->send_mirror)
 294                         continue;
 295
 296                 switch (ref->status) {
 297                 case REF_STATUS_EXPECTING_REPORT:
 298                         ref->status = REF_STATUS_ATOMIC_PUSH_FAILED;
 299                         continue;
 300                 default:
 301                         break; /* do nothing */
 302                 }
 303         }
 304         return error("atomic push failed for ref %s. status: %d\n",
 305                      failing_ref->name, failing_ref->status);
 306 }
 307
 308 int send_pack(struct send_pack_args *args,
 309               int fd[], struct child_process *conn,
 310               struct ref *remote_refs,
 311               struct sha1_array *extra_have)
 312 {
 313         int in = fd[0];
 314         int out = fd[1];
 315         struct strbuf req_buf = STRBUF_INIT;
 316         struct strbuf cap_buf = STRBUF_INIT;
 317         struct ref *ref;
 318         int need_pack_data = 0;
 319         int allow_deleting_refs = 0;
 320         int status_report = 0;
 321         int use_sideband = 0;
 322         int quiet_supported = 0;
 323         int agent_supported = 0;
 324         int use_atomic = 0;
 325         int atomic_supported = 0;
 326         unsigned cmds_sent = 0;
 327         int ret;
 328         struct async demux;
 329         const char *push_cert_nonce = NULL;
 330
 331         /* Does the other end support the reporting? */
 332         if (server_supports("report-status"))
 333                 status_report = 1;
 334         if (server_supports("delete-refs"))
 335                 allow_deleting_refs = 1;
 336         if (server_supports("ofs-delta"))
 337                 args->use_ofs_delta = 1;
 338         if (server_supports("side-band-64k"))
 339                 use_sideband = 1;
 340         if (server_supports("quiet"))
 341                 quiet_supported = 1;
 342         if (server_supports("agent"))
 343                 agent_supported = 1;
 344         if (server_supports("no-thin"))
 345                 args->use_thin_pack = 0;
 346         if (server_supports("atomic"))
 347                 atomic_supported = 1;
 348         if (args->push_cert) {
 349                 int len;
 350
 351                 push_cert_nonce = server_feature_value("push-cert", &len);
 352                 if (!push_cert_nonce)
 353                         die(_("the receiving end does not support --signed push"));
 354                 push_cert_nonce = xmemdupz(push_cert_nonce, len);
 355         }
 356
 357         if (!remote_refs) {
 358                 fprintf(stderr, "No refs in common and none specified; doing nothing.\n"
 359                         "Perhaps you should specify a branch such as 'master'.\n");
 360                 return 0;
 361         }
 362         if (args->atomic && !atomic_supported)
 363                 die(_("the receiving end does not support --atomic push"));
 364
 365         use_atomic = atomic_supported && args->atomic;
 366
 367         if (status_report)
 368                 strbuf_addstr(&cap_buf, " report-status");
 369         if (use_sideband)
 370                 strbuf_addstr(&cap_buf, " side-band-64k");
 371         if (quiet_supported && (args->quiet || !args->progress))
 372                 strbuf_addstr(&cap_buf, " quiet");
 373         if (use_atomic)
 374                 strbuf_addstr(&cap_buf, " atomic");
 375         if (agent_supported)
 376                 strbuf_addf(&cap_buf, " agent=%s", git_user_agent_sanitized());
 377
 378         /*
 379          * NEEDSWORK: why does delete-refs have to be so specific to
 380          * send-pack machinery that set_ref_status_for_push() cannot
 381          * set this bit for us???
 382          */
 383         for (ref = remote_refs; ref; ref = ref->next)
 384                 if (ref->deletion && !allow_deleting_refs)
 385                         ref->status = REF_STATUS_REJECT_NODELETE;
 386
 387         if (!args->dry_run)
 388                 advertise_shallow_grafts_buf(&req_buf);
 389
 390         if (!args->dry_run && args->push_cert)
 391                 cmds_sent = generate_push_cert(&req_buf, remote_refs, args,
 392                                                cap_buf.buf, push_cert_nonce);
 393
 394         /*
 395          * Clear the status for each ref and see if we need to send
 396          * the pack data.
 397          */
 398         for (ref = remote_refs; ref; ref = ref->next) {
 399                 switch (check_to_send_update(ref, args)) {
 400                 case 0: /* no error */
 401                         break;
 402                 case CHECK_REF_STATUS_REJECTED:
 403                         /*
 404                          * When we know the server would reject a ref update if
 405                          * we were to send it and we're trying to send the refs
 406                          * atomically, abort the whole operation.
 407                          */
 408                         if (use_atomic)
 409                                 return atomic_push_failure(args, remote_refs, ref);
 410                         /* Fallthrough for non atomic case. */
 411                 default:
 412                         continue;
 413                 }
 414                 if (!ref->deletion)
 415                         need_pack_data = 1;
 416
 417                 if (args->dry_run || !status_report)
 418                         ref->status = REF_STATUS_OK;
 419                 else
 420                         ref->status = REF_STATUS_EXPECTING_REPORT;
 421         }
 422
 423         /*
 424          * Finally, tell the other end!
 425          */
 426         for (ref = remote_refs; ref; ref = ref->next) {
 427                 char *old_hex, *new_hex;
 428
 429                 if (args->dry_run || args->push_cert)
 430                         continue;
 431
 432                 if (check_to_send_update(ref, args) < 0)
 433                         continue;
 434
 435                 old_hex = sha1_to_hex(ref->old_sha1);
 436                 new_hex = sha1_to_hex(ref->new_sha1);
 437                 if (!cmds_sent) {
 438                         packet_buf_write(&req_buf,
 439                                          "%s %s %s%c%s",
 440                                          old_hex, new_hex, ref->name, 0,
 441                                          cap_buf.buf);
 442                         cmds_sent = 1;
 443                 } else {
 444                         packet_buf_write(&req_buf, "%s %s %s",
 445                                          old_hex, new_hex, ref->name);
 446                 }
 447         }
 448
 449         if (args->stateless_rpc) {
 450                 if (!args->dry_run && (cmds_sent || is_repository_shallow())) {
 451                         packet_buf_flush(&req_buf);
 452                         send_sideband(out, -1, req_buf.buf, req_buf.len, LARGE_PACKET_MAX);
 453                 }
 454         } else {
 455                 write_or_die(out, req_buf.buf, req_buf.len);
 456                 packet_flush(out);
 457         }
 458         strbuf_release(&req_buf);
 459         strbuf_release(&cap_buf);
 460
 461         if (use_sideband && cmds_sent) {
 462                 memset(&demux, 0, sizeof(demux));
 463                 demux.proc = sideband_demux;
 464                 demux.data = fd;
 465                 demux.out = -1;
 466                 if (start_async(&demux))
 467                         die("send-pack: unable to fork off sideband demultiplexer");
 468                 in = demux.out;
 469         }
 470
 471         if (need_pack_data && cmds_sent) {
 472                 if (pack_objects(out, remote_refs, extra_have, args) < 0) {
 473                         for (ref = remote_refs; ref; ref = ref->next)
 474                                 ref->status = REF_STATUS_NONE;
 475                         if (args->stateless_rpc)
 476                                 close(out);
 477                         if (git_connection_is_socket(conn))
 478                                 shutdown(fd[0], SHUT_WR);
 479                         if (use_sideband)
 480                                 finish_async(&demux);
 481                         fd[1] = -1;
 482                         return -1;
 483                 }
 484                 if (!args->stateless_rpc)
 485                         /* Closed by pack_objects() via start_command() */
 486                         fd[1] = -1;
 487         }
 488         if (args->stateless_rpc && cmds_sent)
 489                 packet_flush(out);
 490
 491         if (status_report && cmds_sent)
 492                 ret = receive_status(in, remote_refs);
 493         else
 494                 ret = 0;
 495         if (args->stateless_rpc)
 496                 packet_flush(out);
 497
 498         if (use_sideband && cmds_sent) {
 499                 if (finish_async(&demux)) {
 500                         error("error in sideband demultiplexer");
 501                         ret = -1;
 502                 }
 503                 close(demux.out);
 504         }
 505
 506         if (ret < 0)
 507                 return ret;
 508
 509         if (args->porcelain)
 510                 return 0;
 511
 512         for (ref = remote_refs; ref; ref = ref->next) {
 513                 switch (ref->status) {
 514                 case REF_STATUS_NONE:
 515                 case REF_STATUS_UPTODATE:
 516                 case REF_STATUS_OK:
 517                         break;
 518                 default:
 519                         return -1;
 520                 }
 521         }
 522         return 0;
 523 }