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;
  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         memset(&po, 0, sizeof(po));
  64         po.argv = argv;
  65         po.in = -1;
  66         po.out = args->stateless_rpc ? -1 : fd;
  67         po.git_cmd = 1;
  68         if (start_command(&po))
  69                 die_errno("git pack-objects failed");
  70
  71         /*
  72          * We feed the pack-objects we just spawned with revision
  73          * parameters by writing to the pipe.
  74          */
  75         for (i = 0; i < extra->nr; i++)
  76                 if (!feed_object(extra->sha1[i], po.in, 1))
  77                         break;
  78
  79         while (refs) {
  80                 if (!is_null_sha1(refs->old_sha1) &&
  81                     !feed_object(refs->old_sha1, po.in, 1))
  82                         break;
  83                 if (!is_null_sha1(refs->new_sha1) &&
  84                     !feed_object(refs->new_sha1, po.in, 0))
  85                         break;
  86                 refs = refs->next;
  87         }
  88
  89         close(po.in);
  90
  91         if (args->stateless_rpc) {
  92                 char *buf = xmalloc(LARGE_PACKET_MAX);
  93                 while (1) {
  94                         ssize_t n = xread(po.out, buf, LARGE_PACKET_MAX);
  95                         if (n <= 0)
  96                                 break;
  97                         send_sideband(fd, -1, buf, n, LARGE_PACKET_MAX);
  98                 }
  99                 free(buf);
 100                 close(po.out);
 101                 po.out = -1;
 102         }
 103
 104         if (finish_command(&po))
 105                 return -1;
 106         return 0;
 107 }
 108
 109 static int receive_status(int in, struct ref *refs)
 110 {
 111         struct ref *hint;
 112         int ret = 0;
 113         char *line = packet_read_line(in, NULL);
 114         if (!starts_with(line, "unpack "))
 115                 return error("did not receive remote status");
 116         if (strcmp(line, "unpack ok")) {
 117                 error("unpack failed: %s", line + 7);
 118                 ret = -1;
 119         }
 120         hint = NULL;
 121         while (1) {
 122                 char *refname;
 123                 char *msg;
 124                 line = packet_read_line(in, NULL);
 125                 if (!line)
 126                         break;
 127                 if (!starts_with(line, "ok ") && !starts_with(line, "ng ")) {
 128                         error("invalid ref status from remote: %s", line);
 129                         ret = -1;
 130                         break;
 131                 }
 132
 133                 refname = line + 3;
 134                 msg = strchr(refname, ' ');
 135                 if (msg)
 136                         *msg++ = '\0';
 137
 138                 /* first try searching at our hint, falling back to all refs */
 139                 if (hint)
 140                         hint = find_ref_by_name(hint, refname);
 141                 if (!hint)
 142                         hint = find_ref_by_name(refs, refname);
 143                 if (!hint) {
 144                         warning("remote reported status on unknown ref: %s",
 145                                         refname);
 146                         continue;
 147                 }
 148                 if (hint->status != REF_STATUS_EXPECTING_REPORT) {
 149                         warning("remote reported status on unexpected ref: %s",
 150                                         refname);
 151                         continue;
 152                 }
 153
 154                 if (line[0] == 'o' && line[1] == 'k')
 155                         hint->status = REF_STATUS_OK;
 156                 else {
 157                         hint->status = REF_STATUS_REMOTE_REJECT;
 158                         ret = -1;
 159                 }
 160                 if (msg)
 161                         hint->remote_status = xstrdup(msg);
 162                 /* start our next search from the next ref */
 163                 hint = hint->next;
 164         }
 165         return ret;
 166 }
 167
 168 static int sideband_demux(int in, int out, void *data)
 169 {
 170         int *fd = data, ret;
 171 #ifdef NO_PTHREADS
 172         close(fd[1]);
 173 #endif
 174         ret = recv_sideband("send-pack", fd[0], out);
 175         close(out);
 176         return ret;
 177 }
 178
 179 static int advertise_shallow_grafts_cb(const struct commit_graft *graft, void *cb)
 180 {
 181         struct strbuf *sb = cb;
 182         if (graft->nr_parent == -1)
 183                 packet_buf_write(sb, "shallow %s\n", sha1_to_hex(graft->sha1));
 184         return 0;
 185 }
 186
 187 static void advertise_shallow_grafts_buf(struct strbuf *sb)
 188 {
 189         if (!is_repository_shallow())
 190                 return;
 191         for_each_commit_graft(advertise_shallow_grafts_cb, sb);
 192 }
 193
 194 static int ref_update_to_be_sent(const struct ref *ref, const struct send_pack_args *args)
 195 {
 196         if (!ref->peer_ref && !args->send_mirror)
 197                 return 0;
 198
 199         /* Check for statuses set by set_ref_status_for_push() */
 200         switch (ref->status) {
 201         case REF_STATUS_REJECT_NONFASTFORWARD:
 202         case REF_STATUS_REJECT_ALREADY_EXISTS:
 203         case REF_STATUS_REJECT_FETCH_FIRST:
 204         case REF_STATUS_REJECT_NEEDS_FORCE:
 205         case REF_STATUS_REJECT_STALE:
 206         case REF_STATUS_REJECT_NODELETE:
 207         case REF_STATUS_UPTODATE:
 208                 return 0;
 209         default:
 210                 return 1;
 211         }
 212 }
 213
 214 /*
 215  * the beginning of the next line, or the end of buffer.
 216  *
 217  * NEEDSWORK: perhaps move this to git-compat-util.h or somewhere and
 218  * convert many similar uses found by "git grep -A4 memchr".
 219  */
 220 static const char *next_line(const char *line, size_t len)
 221 {
 222         const char *nl = memchr(line, '\n', len);
 223         if (!nl)
 224                 return line + len; /* incomplete line */
 225         return nl + 1;
 226 }
 227
 228 static int generate_push_cert(struct strbuf *req_buf,
 229                               const struct ref *remote_refs,
 230                               struct send_pack_args *args,
 231                               const char *cap_string,
 232                               const char *push_cert_nonce)
 233 {
 234         const struct ref *ref;
 235         char stamp[60];
 236         char *signing_key = xstrdup(get_signing_key());
 237         const char *cp, *np;
 238         struct strbuf cert = STRBUF_INIT;
 239         int update_seen = 0;
 240
 241         datestamp(stamp, sizeof(stamp));
 242         strbuf_addf(&cert, "certificate version 0.1\n");
 243         strbuf_addf(&cert, "pusher %s %s\n", signing_key, stamp);
 244         if (args->url && *args->url) {
 245                 char *anon_url = transport_anonymize_url(args->url);
 246                 strbuf_addf(&cert, "pushee %s\n", anon_url);
 247                 free(anon_url);
 248         }
 249         if (push_cert_nonce[0])
 250                 strbuf_addf(&cert, "nonce %s\n", push_cert_nonce);
 251         strbuf_addstr(&cert, "\n");
 252
 253         for (ref = remote_refs; ref; ref = ref->next) {
 254                 if (!ref_update_to_be_sent(ref, args))
 255                         continue;
 256                 update_seen = 1;
 257                 strbuf_addf(&cert, "%s %s %s\n",
 258                             sha1_to_hex(ref->old_sha1),
 259                             sha1_to_hex(ref->new_sha1),
 260                             ref->name);
 261         }
 262         if (!update_seen)
 263                 goto free_return;
 264
 265         if (sign_buffer(&cert, &cert, signing_key))
 266                 die(_("failed to sign the push certificate"));
 267
 268         packet_buf_write(req_buf, "push-cert%c%s", 0, cap_string);
 269         for (cp = cert.buf; cp < cert.buf + cert.len; cp = np) {
 270                 np = next_line(cp, cert.buf + cert.len - cp);
 271                 packet_buf_write(req_buf,
 272                                  "%.*s", (int)(np - cp), cp);
 273         }
 274         packet_buf_write(req_buf, "push-cert-end\n");
 275
 276 free_return:
 277         free(signing_key);
 278         strbuf_release(&cert);
 279         return update_seen;
 280 }
 281
 282 #define NONCE_LEN_LIMIT 256
 283
 284 static void reject_invalid_nonce(const char *nonce, int len)
 285 {
 286         int i = 0;
 287
 288         if (NONCE_LEN_LIMIT <= len)
 289                 die("the receiving end asked to sign an invalid nonce <%.*s>",
 290                     len, nonce);
 291
 292         for (i = 0; i < len; i++) {
 293                 int ch = nonce[i] & 0xFF;
 294                 if (isalnum(ch) ||
 295                     ch == '-' || ch == '.' ||
 296                     ch == '/' || ch == '+' ||
 297                     ch == '=' || ch == '_')
 298                         continue;
 299                 die("the receiving end asked to sign an invalid nonce <%.*s>",
 300                     len, nonce);
 301         }
 302 }
 303
 304 int send_pack(struct send_pack_args *args,
 305               int fd[], struct child_process *conn,
 306               struct ref *remote_refs,
 307               struct sha1_array *extra_have)
 308 {
 309         int in = fd[0];
 310         int out = fd[1];
 311         struct strbuf req_buf = STRBUF_INIT;
 312         struct strbuf cap_buf = STRBUF_INIT;
 313         struct ref *ref;
 314         int need_pack_data = 0;
 315         int allow_deleting_refs = 0;
 316         int status_report = 0;
 317         int use_sideband = 0;
 318         int quiet_supported = 0;
 319         int agent_supported = 0;
 320         unsigned cmds_sent = 0;
 321         int ret;
 322         struct async demux;
 323         const char *push_cert_nonce = NULL;
 324
 325         /* Does the other end support the reporting? */
 326         if (server_supports("report-status"))
 327                 status_report = 1;
 328         if (server_supports("delete-refs"))
 329                 allow_deleting_refs = 1;
 330         if (server_supports("ofs-delta"))
 331                 args->use_ofs_delta = 1;
 332         if (server_supports("side-band-64k"))
 333                 use_sideband = 1;
 334         if (server_supports("quiet"))
 335                 quiet_supported = 1;
 336         if (server_supports("agent"))
 337                 agent_supported = 1;
 338         if (server_supports("no-thin"))
 339                 args->use_thin_pack = 0;
 340         if (args->push_cert) {
 341                 int len;
 342
 343                 push_cert_nonce = server_feature_value("push-cert", &len);
 344                 if (!push_cert_nonce)
 345                         die(_("the receiving end does not support --signed push"));
 346                 reject_invalid_nonce(push_cert_nonce, len);
 347                 push_cert_nonce = xmemdupz(push_cert_nonce, len);
 348         }
 349
 350         if (!remote_refs) {
 351                 fprintf(stderr, "No refs in common and none specified; doing nothing.\n"
 352                         "Perhaps you should specify a branch such as 'master'.\n");
 353                 return 0;
 354         }
 355
 356         if (status_report)
 357                 strbuf_addstr(&cap_buf, " report-status");
 358         if (use_sideband)
 359                 strbuf_addstr(&cap_buf, " side-band-64k");
 360         if (quiet_supported && (args->quiet || !args->progress))
 361                 strbuf_addstr(&cap_buf, " quiet");
 362         if (agent_supported)
 363                 strbuf_addf(&cap_buf, " agent=%s", git_user_agent_sanitized());
 364
 365         /*
 366          * NEEDSWORK: why does delete-refs have to be so specific to
 367          * send-pack machinery that set_ref_status_for_push() cannot
 368          * set this bit for us???
 369          */
 370         for (ref = remote_refs; ref; ref = ref->next)
 371                 if (ref->deletion && !allow_deleting_refs)
 372                         ref->status = REF_STATUS_REJECT_NODELETE;
 373
 374         if (!args->dry_run)
 375                 advertise_shallow_grafts_buf(&req_buf);
 376
 377         if (!args->dry_run && args->push_cert)
 378                 cmds_sent = generate_push_cert(&req_buf, remote_refs, args,
 379                                                cap_buf.buf, push_cert_nonce);
 380
 381         /*
 382          * Clear the status for each ref and see if we need to send
 383          * the pack data.
 384          */
 385         for (ref = remote_refs; ref; ref = ref->next) {
 386                 if (!ref_update_to_be_sent(ref, args))
 387                         continue;
 388
 389                 if (!ref->deletion)
 390                         need_pack_data = 1;
 391
 392                 if (args->dry_run || !status_report)
 393                         ref->status = REF_STATUS_OK;
 394                 else
 395                         ref->status = REF_STATUS_EXPECTING_REPORT;
 396         }
 397
 398         /*
 399          * Finally, tell the other end!
 400          */
 401         for (ref = remote_refs; ref; ref = ref->next) {
 402                 char *old_hex, *new_hex;
 403
 404                 if (args->dry_run || args->push_cert)
 405                         continue;
 406
 407                 if (!ref_update_to_be_sent(ref, args))
 408                         continue;
 409
 410                 old_hex = sha1_to_hex(ref->old_sha1);
 411                 new_hex = sha1_to_hex(ref->new_sha1);
 412                 if (!cmds_sent) {
 413                         packet_buf_write(&req_buf,
 414                                          "%s %s %s%c%s",
 415                                          old_hex, new_hex, ref->name, 0,
 416                                          cap_buf.buf);
 417                         cmds_sent = 1;
 418                 } else {
 419                         packet_buf_write(&req_buf, "%s %s %s",
 420                                          old_hex, new_hex, ref->name);
 421                 }
 422         }
 423
 424         if (args->stateless_rpc) {
 425                 if (!args->dry_run && (cmds_sent || is_repository_shallow())) {
 426                         packet_buf_flush(&req_buf);
 427                         send_sideband(out, -1, req_buf.buf, req_buf.len, LARGE_PACKET_MAX);
 428                 }
 429         } else {
 430                 write_or_die(out, req_buf.buf, req_buf.len);
 431                 packet_flush(out);
 432         }
 433         strbuf_release(&req_buf);
 434         strbuf_release(&cap_buf);
 435
 436         if (use_sideband && cmds_sent) {
 437                 memset(&demux, 0, sizeof(demux));
 438                 demux.proc = sideband_demux;
 439                 demux.data = fd;
 440                 demux.out = -1;
 441                 if (start_async(&demux))
 442                         die("send-pack: unable to fork off sideband demultiplexer");
 443                 in = demux.out;
 444         }
 445
 446         if (need_pack_data && cmds_sent) {
 447                 if (pack_objects(out, remote_refs, extra_have, args) < 0) {
 448                         for (ref = remote_refs; ref; ref = ref->next)
 449                                 ref->status = REF_STATUS_NONE;
 450                         if (args->stateless_rpc)
 451                                 close(out);
 452                         if (git_connection_is_socket(conn))
 453                                 shutdown(fd[0], SHUT_WR);
 454                         if (use_sideband)
 455                                 finish_async(&demux);
 456                         fd[1] = -1;
 457                         return -1;
 458                 }
 459                 if (!args->stateless_rpc)
 460                         /* Closed by pack_objects() via start_command() */
 461                         fd[1] = -1;
 462         }
 463         if (args->stateless_rpc && cmds_sent)
 464                 packet_flush(out);
 465
 466         if (status_report && cmds_sent)
 467                 ret = receive_status(in, remote_refs);
 468         else
 469                 ret = 0;
 470         if (args->stateless_rpc)
 471                 packet_flush(out);
 472
 473         if (use_sideband && cmds_sent) {
 474                 if (finish_async(&demux)) {
 475                         error("error in sideband demultiplexer");
 476                         ret = -1;
 477                 }
 478                 close(demux.out);
 479         }
 480
 481         if (ret < 0)
 482                 return ret;
 483
 484         if (args->porcelain)
 485                 return 0;
 486
 487         for (ref = remote_refs; ref; ref = ref->next) {
 488                 switch (ref->status) {
 489                 case REF_STATUS_NONE:
 490                 case REF_STATUS_UPTODATE:
 491                 case REF_STATUS_OK:
 492                         break;
 493                 default:
 494                         return -1;
 495                 }
 496         }
 497         return 0;
 498 }