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 static int ref_update_to_be_sent(const struct ref *ref, const struct send_pack_args *args)
 194 {
 195         if (!ref->peer_ref && !args->send_mirror)
 196                 return 0;
 197
 198         /* Check for statuses set by set_ref_status_for_push() */
 199         switch (ref->status) {
 200         case REF_STATUS_REJECT_NONFASTFORWARD:
 201         case REF_STATUS_REJECT_ALREADY_EXISTS:
 202         case REF_STATUS_REJECT_FETCH_FIRST:
 203         case REF_STATUS_REJECT_NEEDS_FORCE:
 204         case REF_STATUS_REJECT_STALE:
 205         case REF_STATUS_REJECT_NODELETE:
 206         case REF_STATUS_UPTODATE:
 207                 return 0;
 208         default:
 209                 return 1;
 210         }
 211 }
 212
 213 /*
 214  * the beginning of the next line, or the end of buffer.
 215  *
 216  * NEEDSWORK: perhaps move this to git-compat-util.h or somewhere and
 217  * convert many similar uses found by "git grep -A4 memchr".
 218  */
 219 static const char *next_line(const char *line, size_t len)
 220 {
 221         const char *nl = memchr(line, '\n', len);
 222         if (!nl)
 223                 return line + len; /* incomplete line */
 224         return nl + 1;
 225 }
 226
 227 static int generate_push_cert(struct strbuf *req_buf,
 228                               const struct ref *remote_refs,
 229                               struct send_pack_args *args,
 230                               const char *cap_string,
 231                               const char *push_cert_nonce)
 232 {
 233         const struct ref *ref;
 234         char *signing_key = xstrdup(get_signing_key());
 235         const char *cp, *np;
 236         struct strbuf cert = STRBUF_INIT;
 237         int update_seen = 0;
 238
 239         strbuf_addf(&cert, "certificate version 0.1\n");
 240         strbuf_addf(&cert, "pusher %s ", signing_key);
 241         datestamp(&cert);
 242         strbuf_addch(&cert, '\n');
 243         if (args->url && *args->url) {
 244                 char *anon_url = transport_anonymize_url(args->url);
 245                 strbuf_addf(&cert, "pushee %s\n", anon_url);
 246                 free(anon_url);
 247         }
 248         if (push_cert_nonce[0])
 249                 strbuf_addf(&cert, "nonce %s\n", push_cert_nonce);
 250         strbuf_addstr(&cert, "\n");
 251
 252         for (ref = remote_refs; ref; ref = ref->next) {
 253                 if (!ref_update_to_be_sent(ref, args))
 254                         continue;
 255                 update_seen = 1;
 256                 strbuf_addf(&cert, "%s %s %s\n",
 257                             sha1_to_hex(ref->old_sha1),
 258                             sha1_to_hex(ref->new_sha1),
 259                             ref->name);
 260         }
 261         if (!update_seen)
 262                 goto free_return;
 263
 264         if (sign_buffer(&cert, &cert, signing_key))
 265                 die(_("failed to sign the push certificate"));
 266
 267         packet_buf_write(req_buf, "push-cert%c%s", 0, cap_string);
 268         for (cp = cert.buf; cp < cert.buf + cert.len; cp = np) {
 269                 np = next_line(cp, cert.buf + cert.len - cp);
 270                 packet_buf_write(req_buf,
 271                                  "%.*s", (int)(np - cp), cp);
 272         }
 273         packet_buf_write(req_buf, "push-cert-end\n");
 274
 275 free_return:
 276         free(signing_key);
 277         strbuf_release(&cert);
 278         return update_seen;
 279 }
 280
 281 int send_pack(struct send_pack_args *args,
 282               int fd[], struct child_process *conn,
 283               struct ref *remote_refs,
 284               struct sha1_array *extra_have)
 285 {
 286         int in = fd[0];
 287         int out = fd[1];
 288         struct strbuf req_buf = STRBUF_INIT;
 289         struct strbuf cap_buf = STRBUF_INIT;
 290         struct ref *ref;
 291         int need_pack_data = 0;
 292         int allow_deleting_refs = 0;
 293         int status_report = 0;
 294         int use_sideband = 0;
 295         int quiet_supported = 0;
 296         int agent_supported = 0;
 297         unsigned cmds_sent = 0;
 298         int ret;
 299         struct async demux;
 300         const char *push_cert_nonce = NULL;
 301
 302         /* Does the other end support the reporting? */
 303         if (server_supports("report-status"))
 304                 status_report = 1;
 305         if (server_supports("delete-refs"))
 306                 allow_deleting_refs = 1;
 307         if (server_supports("ofs-delta"))
 308                 args->use_ofs_delta = 1;
 309         if (server_supports("side-band-64k"))
 310                 use_sideband = 1;
 311         if (server_supports("quiet"))
 312                 quiet_supported = 1;
 313         if (server_supports("agent"))
 314                 agent_supported = 1;
 315         if (server_supports("no-thin"))
 316                 args->use_thin_pack = 0;
 317         if (args->push_cert) {
 318                 int len;
 319
 320                 push_cert_nonce = server_feature_value("push-cert", &len);
 321                 if (!push_cert_nonce)
 322                         die(_("the receiving end does not support --signed push"));
 323                 push_cert_nonce = xmemdupz(push_cert_nonce, len);
 324         }
 325
 326         if (!remote_refs) {
 327                 fprintf(stderr, "No refs in common and none specified; doing nothing.\n"
 328                         "Perhaps you should specify a branch such as 'master'.\n");
 329                 return 0;
 330         }
 331
 332         if (status_report)
 333                 strbuf_addstr(&cap_buf, " report-status");
 334         if (use_sideband)
 335                 strbuf_addstr(&cap_buf, " side-band-64k");
 336         if (quiet_supported && (args->quiet || !args->progress))
 337                 strbuf_addstr(&cap_buf, " quiet");
 338         if (agent_supported)
 339                 strbuf_addf(&cap_buf, " agent=%s", git_user_agent_sanitized());
 340
 341         /*
 342          * NEEDSWORK: why does delete-refs have to be so specific to
 343          * send-pack machinery that set_ref_status_for_push() cannot
 344          * set this bit for us???
 345          */
 346         for (ref = remote_refs; ref; ref = ref->next)
 347                 if (ref->deletion && !allow_deleting_refs)
 348                         ref->status = REF_STATUS_REJECT_NODELETE;
 349
 350         if (!args->dry_run)
 351                 advertise_shallow_grafts_buf(&req_buf);
 352
 353         if (!args->dry_run && args->push_cert)
 354                 cmds_sent = generate_push_cert(&req_buf, remote_refs, args,
 355                                                cap_buf.buf, push_cert_nonce);
 356
 357         /*
 358          * Clear the status for each ref and see if we need to send
 359          * the pack data.
 360          */
 361         for (ref = remote_refs; ref; ref = ref->next) {
 362                 if (!ref_update_to_be_sent(ref, args))
 363                         continue;
 364
 365                 if (!ref->deletion)
 366                         need_pack_data = 1;
 367
 368                 if (args->dry_run || !status_report)
 369                         ref->status = REF_STATUS_OK;
 370                 else
 371                         ref->status = REF_STATUS_EXPECTING_REPORT;
 372         }
 373
 374         /*
 375          * Finally, tell the other end!
 376          */
 377         for (ref = remote_refs; ref; ref = ref->next) {
 378                 char *old_hex, *new_hex;
 379
 380                 if (args->dry_run || args->push_cert)
 381                         continue;
 382
 383                 if (!ref_update_to_be_sent(ref, args))
 384                         continue;
 385
 386                 old_hex = sha1_to_hex(ref->old_sha1);
 387                 new_hex = sha1_to_hex(ref->new_sha1);
 388                 if (!cmds_sent) {
 389                         packet_buf_write(&req_buf,
 390                                          "%s %s %s%c%s",
 391                                          old_hex, new_hex, ref->name, 0,
 392                                          cap_buf.buf);
 393                         cmds_sent = 1;
 394                 } else {
 395                         packet_buf_write(&req_buf, "%s %s %s",
 396                                          old_hex, new_hex, ref->name);
 397                 }
 398         }
 399
 400         if (args->stateless_rpc) {
 401                 if (!args->dry_run && (cmds_sent || is_repository_shallow())) {
 402                         packet_buf_flush(&req_buf);
 403                         send_sideband(out, -1, req_buf.buf, req_buf.len, LARGE_PACKET_MAX);
 404                 }
 405         } else {
 406                 write_or_die(out, req_buf.buf, req_buf.len);
 407                 packet_flush(out);
 408         }
 409         strbuf_release(&req_buf);
 410         strbuf_release(&cap_buf);
 411
 412         if (use_sideband && cmds_sent) {
 413                 memset(&demux, 0, sizeof(demux));
 414                 demux.proc = sideband_demux;
 415                 demux.data = fd;
 416                 demux.out = -1;
 417                 if (start_async(&demux))
 418                         die("send-pack: unable to fork off sideband demultiplexer");
 419                 in = demux.out;
 420         }
 421
 422         if (need_pack_data && cmds_sent) {
 423                 if (pack_objects(out, remote_refs, extra_have, args) < 0) {
 424                         for (ref = remote_refs; ref; ref = ref->next)
 425                                 ref->status = REF_STATUS_NONE;
 426                         if (args->stateless_rpc)
 427                                 close(out);
 428                         if (git_connection_is_socket(conn))
 429                                 shutdown(fd[0], SHUT_WR);
 430                         if (use_sideband)
 431                                 finish_async(&demux);
 432                         fd[1] = -1;
 433                         return -1;
 434                 }
 435                 if (!args->stateless_rpc)
 436                         /* Closed by pack_objects() via start_command() */
 437                         fd[1] = -1;
 438         }
 439         if (args->stateless_rpc && cmds_sent)
 440                 packet_flush(out);
 441
 442         if (status_report && cmds_sent)
 443                 ret = receive_status(in, remote_refs);
 444         else
 445                 ret = 0;
 446         if (args->stateless_rpc)
 447                 packet_flush(out);
 448
 449         if (use_sideband && cmds_sent) {
 450                 if (finish_async(&demux)) {
 451                         error("error in sideband demultiplexer");
 452                         ret = -1;
 453                 }
 454                 close(demux.out);
 455         }
 456
 457         if (ret < 0)
 458                 return ret;
 459
 460         if (args->porcelain)
 461                 return 0;
 462
 463         for (ref = remote_refs; ref; ref = ref->next) {
 464                 switch (ref->status) {
 465                 case REF_STATUS_NONE:
 466                 case REF_STATUS_UPTODATE:
 467                 case REF_STATUS_OK:
 468                         break;
 469                 default:
 470                         return -1;
 471                 }
 472         }
 473         return 0;
 474 }