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
  15 static int config_use_sideband = 1;
  16
  17 static int send_pack_config(const char *var, const char *value, void *unused)
  18 {
  19         if (!strcmp("sendpack.sideband", var))
  20                 config_use_sideband = git_config_bool(var, value);
  21
  22         return 0;
  23 }
  24
  25 static int feed_object(const unsigned char *sha1, int fd, int negative)
  26 {
  27         char buf[42];
  28
  29         if (negative && !has_sha1_file(sha1))
  30                 return 1;
  31
  32         memcpy(buf + negative, sha1_to_hex(sha1), 40);
  33         if (negative)
  34                 buf[0] = '^';
  35         buf[40 + negative] = '\n';
  36         return write_or_whine(fd, buf, 41 + negative, "send-pack: send refs");
  37 }
  38
  39 /*
  40  * Make a pack stream and spit it out into file descriptor fd
  41  */
  42 static int pack_objects(int fd, struct ref *refs, struct sha1_array *extra, struct send_pack_args *args)
  43 {
  44         /*
  45          * The child becomes pack-objects --revs; we feed
  46          * the revision parameters to it via its stdin and
  47          * let its stdout go back to the other end.
  48          */
  49         const char *argv[] = {
  50                 "pack-objects",
  51                 "--all-progress-implied",
  52                 "--revs",
  53                 "--stdout",
  54                 NULL,
  55                 NULL,
  56                 NULL,
  57                 NULL,
  58                 NULL,
  59         };
  60         struct child_process po;
  61         int i;
  62
  63         i = 4;
  64         if (args->use_thin_pack)
  65                 argv[i++] = "--thin";
  66         if (args->use_ofs_delta)
  67                 argv[i++] = "--delta-base-offset";
  68         if (args->quiet || !args->progress)
  69                 argv[i++] = "-q";
  70         if (args->progress)
  71                 argv[i++] = "--progress";
  72         memset(&po, 0, sizeof(po));
  73         po.argv = argv;
  74         po.in = -1;
  75         po.out = args->stateless_rpc ? -1 : fd;
  76         po.git_cmd = 1;
  77         if (start_command(&po))
  78                 die_errno("git pack-objects failed");
  79
  80         /*
  81          * We feed the pack-objects we just spawned with revision
  82          * parameters by writing to the pipe.
  83          */
  84         for (i = 0; i < extra->nr; i++)
  85                 if (!feed_object(extra->sha1[i], po.in, 1))
  86                         break;
  87
  88         while (refs) {
  89                 if (!is_null_sha1(refs->old_sha1) &&
  90                     !feed_object(refs->old_sha1, po.in, 1))
  91                         break;
  92                 if (!is_null_sha1(refs->new_sha1) &&
  93                     !feed_object(refs->new_sha1, po.in, 0))
  94                         break;
  95                 refs = refs->next;
  96         }
  97
  98         close(po.in);
  99
 100         if (args->stateless_rpc) {
 101                 char *buf = xmalloc(LARGE_PACKET_MAX);
 102                 while (1) {
 103                         ssize_t n = xread(po.out, buf, LARGE_PACKET_MAX);
 104                         if (n <= 0)
 105                                 break;
 106                         send_sideband(fd, -1, buf, n, LARGE_PACKET_MAX);
 107                 }
 108                 free(buf);
 109                 close(po.out);
 110                 po.out = -1;
 111         }
 112
 113         if (finish_command(&po))
 114                 return -1;
 115         return 0;
 116 }
 117
 118 static int receive_status(int in, struct ref *refs)
 119 {
 120         struct ref *hint;
 121         int ret = 0;
 122         char *line = packet_read_line(in, NULL);
 123         if (!starts_with(line, "unpack "))
 124                 return error("did not receive remote status");
 125         if (strcmp(line, "unpack ok")) {
 126                 error("unpack failed: %s", line + 7);
 127                 ret = -1;
 128         }
 129         hint = NULL;
 130         while (1) {
 131                 char *refname;
 132                 char *msg;
 133                 line = packet_read_line(in, NULL);
 134                 if (!line)
 135                         break;
 136                 if (!starts_with(line, "ok ") && !starts_with(line, "ng ")) {
 137                         error("invalid ref status from remote: %s", line);
 138                         ret = -1;
 139                         break;
 140                 }
 141
 142                 refname = line + 3;
 143                 msg = strchr(refname, ' ');
 144                 if (msg)
 145                         *msg++ = '\0';
 146
 147                 /* first try searching at our hint, falling back to all refs */
 148                 if (hint)
 149                         hint = find_ref_by_name(hint, refname);
 150                 if (!hint)
 151                         hint = find_ref_by_name(refs, refname);
 152                 if (!hint) {
 153                         warning("remote reported status on unknown ref: %s",
 154                                         refname);
 155                         continue;
 156                 }
 157                 if (hint->status != REF_STATUS_EXPECTING_REPORT) {
 158                         warning("remote reported status on unexpected ref: %s",
 159                                         refname);
 160                         continue;
 161                 }
 162
 163                 if (line[0] == 'o' && line[1] == 'k')
 164                         hint->status = REF_STATUS_OK;
 165                 else {
 166                         hint->status = REF_STATUS_REMOTE_REJECT;
 167                         ret = -1;
 168                 }
 169                 if (msg)
 170                         hint->remote_status = xstrdup(msg);
 171                 /* start our next search from the next ref */
 172                 hint = hint->next;
 173         }
 174         return ret;
 175 }
 176
 177 static int sideband_demux(int in, int out, void *data)
 178 {
 179         int *fd = data, ret;
 180 #ifdef NO_PTHREADS
 181         close(fd[1]);
 182 #endif
 183         ret = recv_sideband("send-pack", fd[0], out);
 184         close(out);
 185         return ret;
 186 }
 187
 188 static int advertise_shallow_grafts_cb(const struct commit_graft *graft, void *cb)
 189 {
 190         struct strbuf *sb = cb;
 191         if (graft->nr_parent == -1)
 192                 packet_buf_write(sb, "shallow %s\n", sha1_to_hex(graft->sha1));
 193         return 0;
 194 }
 195
 196 static void advertise_shallow_grafts_buf(struct strbuf *sb)
 197 {
 198         if (!is_repository_shallow())
 199                 return;
 200         for_each_commit_graft(advertise_shallow_grafts_cb, sb);
 201 }
 202
 203 int send_pack(struct send_pack_args *args,
 204               int fd[], struct child_process *conn,
 205               struct ref *remote_refs,
 206               struct sha1_array *extra_have)
 207 {
 208         int in = fd[0];
 209         int out = fd[1];
 210         struct strbuf req_buf = STRBUF_INIT;
 211         struct ref *ref;
 212         int new_refs;
 213         int allow_deleting_refs = 0;
 214         int status_report = 0;
 215         int use_sideband = 0;
 216         int quiet_supported = 0;
 217         int agent_supported = 0;
 218         unsigned cmds_sent = 0;
 219         int ret;
 220         struct async demux;
 221
 222         git_config(send_pack_config, NULL);
 223
 224         /* Does the other end support the reporting? */
 225         if (server_supports("report-status"))
 226                 status_report = 1;
 227         if (server_supports("delete-refs"))
 228                 allow_deleting_refs = 1;
 229         if (server_supports("ofs-delta"))
 230                 args->use_ofs_delta = 1;
 231         if (config_use_sideband && server_supports("side-band-64k"))
 232                 use_sideband = 1;
 233         if (server_supports("quiet"))
 234                 quiet_supported = 1;
 235         if (server_supports("agent"))
 236                 agent_supported = 1;
 237         if (server_supports("no-thin"))
 238                 args->use_thin_pack = 0;
 239
 240         if (!remote_refs) {
 241                 fprintf(stderr, "No refs in common and none specified; doing nothing.\n"
 242                         "Perhaps you should specify a branch such as 'master'.\n");
 243                 return 0;
 244         }
 245
 246         if (!args->dry_run)
 247                 advertise_shallow_grafts_buf(&req_buf);
 248
 249         /*
 250          * Finally, tell the other end!
 251          */
 252         new_refs = 0;
 253         for (ref = remote_refs; ref; ref = ref->next) {
 254                 if (!ref->peer_ref && !args->send_mirror)
 255                         continue;
 256
 257                 /* Check for statuses set by set_ref_status_for_push() */
 258                 switch (ref->status) {
 259                 case REF_STATUS_REJECT_NONFASTFORWARD:
 260                 case REF_STATUS_REJECT_ALREADY_EXISTS:
 261                 case REF_STATUS_REJECT_FETCH_FIRST:
 262                 case REF_STATUS_REJECT_NEEDS_FORCE:
 263                 case REF_STATUS_REJECT_STALE:
 264                 case REF_STATUS_UPTODATE:
 265                         continue;
 266                 default:
 267                         ; /* do nothing */
 268                 }
 269
 270                 if (ref->deletion && !allow_deleting_refs) {
 271                         ref->status = REF_STATUS_REJECT_NODELETE;
 272                         continue;
 273                 }
 274
 275                 if (!ref->deletion)
 276                         new_refs++;
 277
 278                 if (args->dry_run) {
 279                         ref->status = REF_STATUS_OK;
 280                 } else {
 281                         char *old_hex = sha1_to_hex(ref->old_sha1);
 282                         char *new_hex = sha1_to_hex(ref->new_sha1);
 283                         int quiet = quiet_supported && (args->quiet || !args->progress);
 284
 285                         if (!cmds_sent && (status_report || use_sideband ||
 286                                            quiet || agent_supported)) {
 287                                 packet_buf_write(&req_buf,
 288                                                  "%s %s %s%c%s%s%s%s%s",
 289                                                  old_hex, new_hex, ref->name, 0,
 290                                                  status_report ? " report-status" : "",
 291                                                  use_sideband ? " side-band-64k" : "",
 292                                                  quiet ? " quiet" : "",
 293                                                  agent_supported ? " agent=" : "",
 294                                                  agent_supported ? git_user_agent_sanitized() : ""
 295                                                 );
 296                         }
 297                         else
 298                                 packet_buf_write(&req_buf, "%s %s %s",
 299                                                  old_hex, new_hex, ref->name);
 300                         ref->status = status_report ?
 301                                 REF_STATUS_EXPECTING_REPORT :
 302                                 REF_STATUS_OK;
 303                         cmds_sent++;
 304                 }
 305         }
 306
 307         if (args->stateless_rpc) {
 308                 if (!args->dry_run && (cmds_sent || is_repository_shallow())) {
 309                         packet_buf_flush(&req_buf);
 310                         send_sideband(out, -1, req_buf.buf, req_buf.len, LARGE_PACKET_MAX);
 311                 }
 312         } else {
 313                 write_or_die(out, req_buf.buf, req_buf.len);
 314                 packet_flush(out);
 315         }
 316         strbuf_release(&req_buf);
 317
 318         if (use_sideband && cmds_sent) {
 319                 memset(&demux, 0, sizeof(demux));
 320                 demux.proc = sideband_demux;
 321                 demux.data = fd;
 322                 demux.out = -1;
 323                 if (start_async(&demux))
 324                         die("send-pack: unable to fork off sideband demultiplexer");
 325                 in = demux.out;
 326         }
 327
 328         if (new_refs && cmds_sent) {
 329                 if (pack_objects(out, remote_refs, extra_have, args) < 0) {
 330                         for (ref = remote_refs; ref; ref = ref->next)
 331                                 ref->status = REF_STATUS_NONE;
 332                         if (args->stateless_rpc)
 333                                 close(out);
 334                         if (git_connection_is_socket(conn))
 335                                 shutdown(fd[0], SHUT_WR);
 336                         if (use_sideband)
 337                                 finish_async(&demux);
 338                         fd[1] = -1;
 339                         return -1;
 340                 }
 341                 if (!args->stateless_rpc)
 342                         /* Closed by pack_objects() via start_command() */
 343                         fd[1] = -1;
 344         }
 345         if (args->stateless_rpc && cmds_sent)
 346                 packet_flush(out);
 347
 348         if (status_report && cmds_sent)
 349                 ret = receive_status(in, remote_refs);
 350         else
 351                 ret = 0;
 352         if (args->stateless_rpc)
 353                 packet_flush(out);
 354
 355         if (use_sideband && cmds_sent) {
 356                 if (finish_async(&demux)) {
 357                         error("error in sideband demultiplexer");
 358                         ret = -1;
 359                 }
 360                 close(demux.out);
 361         }
 362
 363         if (ret < 0)
 364                 return ret;
 365
 366         if (args->porcelain)
 367                 return 0;
 368
 369         for (ref = remote_refs; ref; ref = ref->next) {
 370                 switch (ref->status) {
 371                 case REF_STATUS_NONE:
 372                 case REF_STATUS_UPTODATE:
 373                 case REF_STATUS_OK:
 374                         break;
 375                 default:
 376                         return -1;
 377                 }
 378         }
 379         return 0;
 380 }