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 {
 233         const struct ref *ref;
 234         char stamp[60];
 235         char *signing_key = xstrdup(get_signing_key());
 236         const char *cp, *np;
 237         struct strbuf cert = STRBUF_INIT;
 238         int update_seen = 0;
 239
 240         datestamp(stamp, sizeof(stamp));
 241         strbuf_addf(&cert, "certificate version 0.1\n");
 242         strbuf_addf(&cert, "pusher %s %s\n", signing_key, stamp);
 243         strbuf_addstr(&cert, "\n");
 244
 245         for (ref = remote_refs; ref; ref = ref->next) {
 246                 if (!ref_update_to_be_sent(ref, args))
 247                         continue;
 248                 update_seen = 1;
 249                 strbuf_addf(&cert, "%s %s %s\n",
 250                             sha1_to_hex(ref->old_sha1),
 251                             sha1_to_hex(ref->new_sha1),
 252                             ref->name);
 253         }
 254         if (!update_seen)
 255                 goto free_return;
 256
 257         if (sign_buffer(&cert, &cert, signing_key))
 258                 die(_("failed to sign the push certificate"));
 259
 260         packet_buf_write(req_buf, "push-cert%c%s", 0, cap_string);
 261         for (cp = cert.buf; cp < cert.buf + cert.len; cp = np) {
 262                 np = next_line(cp, cert.buf + cert.len - cp);
 263                 packet_buf_write(req_buf,
 264                                  "%.*s", (int)(np - cp), cp);
 265         }
 266         packet_buf_write(req_buf, "push-cert-end\n");
 267
 268 free_return:
 269         free(signing_key);
 270         strbuf_release(&cert);
 271         return 1;
 272 }
 273
 274 int send_pack(struct send_pack_args *args,
 275               int fd[], struct child_process *conn,
 276               struct ref *remote_refs,
 277               struct sha1_array *extra_have)
 278 {
 279         int in = fd[0];
 280         int out = fd[1];
 281         struct strbuf req_buf = STRBUF_INIT;
 282         struct strbuf cap_buf = STRBUF_INIT;
 283         struct ref *ref;
 284         int need_pack_data = 0;
 285         int allow_deleting_refs = 0;
 286         int status_report = 0;
 287         int use_sideband = 0;
 288         int quiet_supported = 0;
 289         int agent_supported = 0;
 290         unsigned cmds_sent = 0;
 291         int ret;
 292         struct async demux;
 293
 294         /* Does the other end support the reporting? */
 295         if (server_supports("report-status"))
 296                 status_report = 1;
 297         if (server_supports("delete-refs"))
 298                 allow_deleting_refs = 1;
 299         if (server_supports("ofs-delta"))
 300                 args->use_ofs_delta = 1;
 301         if (server_supports("side-band-64k"))
 302                 use_sideband = 1;
 303         if (server_supports("quiet"))
 304                 quiet_supported = 1;
 305         if (server_supports("agent"))
 306                 agent_supported = 1;
 307         if (server_supports("no-thin"))
 308                 args->use_thin_pack = 0;
 309         if (args->push_cert && !server_supports("push-cert"))
 310                 die(_("the receiving end does not support --signed push"));
 311
 312         if (!remote_refs) {
 313                 fprintf(stderr, "No refs in common and none specified; doing nothing.\n"
 314                         "Perhaps you should specify a branch such as 'master'.\n");
 315                 return 0;
 316         }
 317
 318         if (status_report)
 319                 strbuf_addstr(&cap_buf, " report-status");
 320         if (use_sideband)
 321                 strbuf_addstr(&cap_buf, " side-band-64k");
 322         if (quiet_supported && (args->quiet || !args->progress))
 323                 strbuf_addstr(&cap_buf, " quiet");
 324         if (agent_supported)
 325                 strbuf_addf(&cap_buf, " agent=%s", git_user_agent_sanitized());
 326
 327         /*
 328          * NEEDSWORK: why is delete-refs so specific to send-pack
 329          * machinery that set_ref_status_for_push() cannot set this
 330          * bit for us???
 331          */
 332         for (ref = remote_refs; ref; ref = ref->next)
 333                 if (ref->deletion && !allow_deleting_refs)
 334                         ref->status = REF_STATUS_REJECT_NODELETE;
 335
 336         if (!args->dry_run)
 337                 advertise_shallow_grafts_buf(&req_buf);
 338
 339         if (!args->dry_run && args->push_cert)
 340                 cmds_sent = generate_push_cert(&req_buf, remote_refs, args,
 341                                                cap_buf.buf);
 342
 343         /*
 344          * Clear the status for each ref and see if we need to send
 345          * the pack data.
 346          */
 347         for (ref = remote_refs; ref; ref = ref->next) {
 348                 if (!ref_update_to_be_sent(ref, args))
 349                         continue;
 350
 351                 if (!ref->deletion)
 352                         need_pack_data = 1;
 353
 354                 if (args->dry_run || !status_report)
 355                         ref->status = REF_STATUS_OK;
 356                 else
 357                         ref->status = REF_STATUS_EXPECTING_REPORT;
 358         }
 359
 360         /*
 361          * Finally, tell the other end!
 362          */
 363         for (ref = remote_refs; ref; ref = ref->next) {
 364                 char *old_hex, *new_hex;
 365
 366                 if (args->dry_run || args->push_cert)
 367                         continue;
 368
 369                 if (!ref_update_to_be_sent(ref, args))
 370                         continue;
 371
 372                 old_hex = sha1_to_hex(ref->old_sha1);
 373                 new_hex = sha1_to_hex(ref->new_sha1);
 374                 if (!cmds_sent) {
 375                         packet_buf_write(&req_buf,
 376                                          "%s %s %s%c%s",
 377                                          old_hex, new_hex, ref->name, 0,
 378                                          cap_buf.buf);
 379                         cmds_sent = 1;
 380                 } else {
 381                         packet_buf_write(&req_buf, "%s %s %s",
 382                                          old_hex, new_hex, ref->name);
 383                 }
 384         }
 385
 386         if (args->stateless_rpc) {
 387                 if (!args->dry_run && (cmds_sent || is_repository_shallow())) {
 388                         packet_buf_flush(&req_buf);
 389                         send_sideband(out, -1, req_buf.buf, req_buf.len, LARGE_PACKET_MAX);
 390                 }
 391         } else {
 392                 write_or_die(out, req_buf.buf, req_buf.len);
 393                 packet_flush(out);
 394         }
 395         strbuf_release(&req_buf);
 396         strbuf_release(&cap_buf);
 397
 398         if (use_sideband && cmds_sent) {
 399                 memset(&demux, 0, sizeof(demux));
 400                 demux.proc = sideband_demux;
 401                 demux.data = fd;
 402                 demux.out = -1;
 403                 if (start_async(&demux))
 404                         die("send-pack: unable to fork off sideband demultiplexer");
 405                 in = demux.out;
 406         }
 407
 408         if (need_pack_data && cmds_sent) {
 409                 if (pack_objects(out, remote_refs, extra_have, args) < 0) {
 410                         for (ref = remote_refs; ref; ref = ref->next)
 411                                 ref->status = REF_STATUS_NONE;
 412                         if (args->stateless_rpc)
 413                                 close(out);
 414                         if (git_connection_is_socket(conn))
 415                                 shutdown(fd[0], SHUT_WR);
 416                         if (use_sideband)
 417                                 finish_async(&demux);
 418                         fd[1] = -1;
 419                         return -1;
 420                 }
 421                 if (!args->stateless_rpc)
 422                         /* Closed by pack_objects() via start_command() */
 423                         fd[1] = -1;
 424         }
 425         if (args->stateless_rpc && cmds_sent)
 426                 packet_flush(out);
 427
 428         if (status_report && cmds_sent)
 429                 ret = receive_status(in, remote_refs);
 430         else
 431                 ret = 0;
 432         if (args->stateless_rpc)
 433                 packet_flush(out);
 434
 435         if (use_sideband && cmds_sent) {
 436                 if (finish_async(&demux)) {
 437                         error("error in sideband demultiplexer");
 438                         ret = -1;
 439                 }
 440                 close(demux.out);
 441         }
 442
 443         if (ret < 0)
 444                 return ret;
 445
 446         if (args->porcelain)
 447                 return 0;
 448
 449         for (ref = remote_refs; ref; ref = ref->next) {
 450                 switch (ref->status) {
 451                 case REF_STATUS_NONE:
 452                 case REF_STATUS_UPTODATE:
 453                 case REF_STATUS_OK:
 454                         break;
 455                 default:
 456                         return -1;
 457                 }
 458         }
 459         return 0;
 460 }