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 "send-pack.h"
   9 #include "quote.h"
  10 #include "transport.h"
  11 #include "version.h"
  12
  13 static int feed_object(const unsigned char *sha1, int fd, int negative)
  14 {
  15         char buf[42];
  16
  17         if (negative && !has_sha1_file(sha1))
  18                 return 1;
  19
  20         memcpy(buf + negative, sha1_to_hex(sha1), 40);
  21         if (negative)
  22                 buf[0] = '^';
  23         buf[40 + negative] = '\n';
  24         return write_or_whine(fd, buf, 41 + negative, "send-pack: send refs");
  25 }
  26
  27 /*
  28  * Make a pack stream and spit it out into file descriptor fd
  29  */
  30 static int pack_objects(int fd, struct ref *refs, struct extra_have_objects *extra, struct send_pack_args *args)
  31 {
  32         /*
  33          * The child becomes pack-objects --revs; we feed
  34          * the revision parameters to it via its stdin and
  35          * let its stdout go back to the other end.
  36          */
  37         const char *argv[] = {
  38                 "pack-objects",
  39                 "--all-progress-implied",
  40                 "--revs",
  41                 "--stdout",
  42                 NULL,
  43                 NULL,
  44                 NULL,
  45                 NULL,
  46                 NULL,
  47         };
  48         struct child_process po;
  49         int i;
  50
  51         i = 4;
  52         if (args->use_thin_pack)
  53                 argv[i++] = "--thin";
  54         if (args->use_ofs_delta)
  55                 argv[i++] = "--delta-base-offset";
  56         if (args->quiet || !args->progress)
  57                 argv[i++] = "-q";
  58         if (args->progress)
  59                 argv[i++] = "--progress";
  60         memset(&po, 0, sizeof(po));
  61         po.argv = argv;
  62         po.in = -1;
  63         po.out = args->stateless_rpc ? -1 : fd;
  64         po.git_cmd = 1;
  65         if (start_command(&po))
  66                 die_errno("git pack-objects failed");
  67
  68         /*
  69          * We feed the pack-objects we just spawned with revision
  70          * parameters by writing to the pipe.
  71          */
  72         for (i = 0; i < extra->nr; i++)
  73                 if (!feed_object(extra->array[i], po.in, 1))
  74                         break;
  75
  76         while (refs) {
  77                 if (!is_null_sha1(refs->old_sha1) &&
  78                     !feed_object(refs->old_sha1, po.in, 1))
  79                         break;
  80                 if (!is_null_sha1(refs->new_sha1) &&
  81                     !feed_object(refs->new_sha1, po.in, 0))
  82                         break;
  83                 refs = refs->next;
  84         }
  85
  86         close(po.in);
  87
  88         if (args->stateless_rpc) {
  89                 char *buf = xmalloc(LARGE_PACKET_MAX);
  90                 while (1) {
  91                         ssize_t n = xread(po.out, buf, LARGE_PACKET_MAX);
  92                         if (n <= 0)
  93                                 break;
  94                         send_sideband(fd, -1, buf, n, LARGE_PACKET_MAX);
  95                 }
  96                 free(buf);
  97                 close(po.out);
  98                 po.out = -1;
  99         }
 100
 101         if (finish_command(&po))
 102                 return -1;
 103         return 0;
 104 }
 105
 106 static int receive_status(int in, struct ref *refs)
 107 {
 108         struct ref *hint;
 109         int ret = 0;
 110         char *line = packet_read_line(in, NULL);
 111         if (prefixcmp(line, "unpack "))
 112                 return error("did not receive remote status");
 113         if (strcmp(line, "unpack ok")) {
 114                 error("unpack failed: %s", line + 7);
 115                 ret = -1;
 116         }
 117         hint = NULL;
 118         while (1) {
 119                 char *refname;
 120                 char *msg;
 121                 line = packet_read_line(in, NULL);
 122                 if (!line)
 123                         break;
 124                 if (prefixcmp(line, "ok ") && prefixcmp(line, "ng ")) {
 125                         error("invalid ref status from remote: %s", line);
 126                         ret = -1;
 127                         break;
 128                 }
 129
 130                 refname = line + 3;
 131                 msg = strchr(refname, ' ');
 132                 if (msg)
 133                         *msg++ = '\0';
 134
 135                 /* first try searching at our hint, falling back to all refs */
 136                 if (hint)
 137                         hint = find_ref_by_name(hint, refname);
 138                 if (!hint)
 139                         hint = find_ref_by_name(refs, refname);
 140                 if (!hint) {
 141                         warning("remote reported status on unknown ref: %s",
 142                                         refname);
 143                         continue;
 144                 }
 145                 if (hint->status != REF_STATUS_EXPECTING_REPORT) {
 146                         warning("remote reported status on unexpected ref: %s",
 147                                         refname);
 148                         continue;
 149                 }
 150
 151                 if (line[0] == 'o' && line[1] == 'k')
 152                         hint->status = REF_STATUS_OK;
 153                 else {
 154                         hint->status = REF_STATUS_REMOTE_REJECT;
 155                         ret = -1;
 156                 }
 157                 if (msg)
 158                         hint->remote_status = xstrdup(msg);
 159                 /* start our next search from the next ref */
 160                 hint = hint->next;
 161         }
 162         return ret;
 163 }
 164
 165 static int sideband_demux(int in, int out, void *data)
 166 {
 167         int *fd = data, ret;
 168 #ifdef NO_PTHREADS
 169         close(fd[1]);
 170 #endif
 171         ret = recv_sideband("send-pack", fd[0], out);
 172         close(out);
 173         return ret;
 174 }
 175
 176 int send_pack(struct send_pack_args *args,
 177               int fd[], struct child_process *conn,
 178               struct ref *remote_refs,
 179               struct extra_have_objects *extra_have)
 180 {
 181         int in = fd[0];
 182         int out = fd[1];
 183         struct strbuf req_buf = STRBUF_INIT;
 184         struct ref *ref;
 185         int new_refs;
 186         int allow_deleting_refs = 0;
 187         int status_report = 0;
 188         int use_sideband = 0;
 189         int quiet_supported = 0;
 190         int agent_supported = 0;
 191         unsigned cmds_sent = 0;
 192         int ret;
 193         struct async demux;
 194
 195         /* Does the other end support the reporting? */
 196         if (server_supports("report-status"))
 197                 status_report = 1;
 198         if (server_supports("delete-refs"))
 199                 allow_deleting_refs = 1;
 200         if (server_supports("ofs-delta"))
 201                 args->use_ofs_delta = 1;
 202         if (server_supports("side-band-64k"))
 203                 use_sideband = 1;
 204         if (server_supports("quiet"))
 205                 quiet_supported = 1;
 206         if (server_supports("agent"))
 207                 agent_supported = 1;
 208
 209         if (!remote_refs) {
 210                 fprintf(stderr, "No refs in common and none specified; doing nothing.\n"
 211                         "Perhaps you should specify a branch such as 'master'.\n");
 212                 return 0;
 213         }
 214
 215         /*
 216          * Finally, tell the other end!
 217          */
 218         new_refs = 0;
 219         for (ref = remote_refs; ref; ref = ref->next) {
 220                 if (!ref->peer_ref && !args->send_mirror)
 221                         continue;
 222
 223                 /* Check for statuses set by set_ref_status_for_push() */
 224                 switch (ref->status) {
 225                 case REF_STATUS_REJECT_NONFASTFORWARD:
 226                 case REF_STATUS_REJECT_ALREADY_EXISTS:
 227                 case REF_STATUS_REJECT_FETCH_FIRST:
 228                 case REF_STATUS_REJECT_NEEDS_FORCE:
 229                 case REF_STATUS_UPTODATE:
 230                         continue;
 231                 default:
 232                         ; /* do nothing */
 233                 }
 234
 235                 if (ref->deletion && !allow_deleting_refs) {
 236                         ref->status = REF_STATUS_REJECT_NODELETE;
 237                         continue;
 238                 }
 239
 240                 if (!ref->deletion)
 241                         new_refs++;
 242
 243                 if (args->dry_run) {
 244                         ref->status = REF_STATUS_OK;
 245                 } else {
 246                         char *old_hex = sha1_to_hex(ref->old_sha1);
 247                         char *new_hex = sha1_to_hex(ref->new_sha1);
 248                         int quiet = quiet_supported && (args->quiet || !args->progress);
 249
 250                         if (!cmds_sent && (status_report || use_sideband ||
 251                                            quiet || agent_supported)) {
 252                                 packet_buf_write(&req_buf,
 253                                                  "%s %s %s%c%s%s%s%s%s",
 254                                                  old_hex, new_hex, ref->name, 0,
 255                                                  status_report ? " report-status" : "",
 256                                                  use_sideband ? " side-band-64k" : "",
 257                                                  quiet ? " quiet" : "",
 258                                                  agent_supported ? " agent=" : "",
 259                                                  agent_supported ? git_user_agent_sanitized() : ""
 260                                                 );
 261                         }
 262                         else
 263                                 packet_buf_write(&req_buf, "%s %s %s",
 264                                                  old_hex, new_hex, ref->name);
 265                         ref->status = status_report ?
 266                                 REF_STATUS_EXPECTING_REPORT :
 267                                 REF_STATUS_OK;
 268                         cmds_sent++;
 269                 }
 270         }
 271
 272         if (args->stateless_rpc) {
 273                 if (!args->dry_run && cmds_sent) {
 274                         packet_buf_flush(&req_buf);
 275                         send_sideband(out, -1, req_buf.buf, req_buf.len, LARGE_PACKET_MAX);
 276                 }
 277         } else {
 278                 write_or_die(out, req_buf.buf, req_buf.len);
 279                 packet_flush(out);
 280         }
 281         strbuf_release(&req_buf);
 282
 283         if (use_sideband && cmds_sent) {
 284                 memset(&demux, 0, sizeof(demux));
 285                 demux.proc = sideband_demux;
 286                 demux.data = fd;
 287                 demux.out = -1;
 288                 if (start_async(&demux))
 289                         die("send-pack: unable to fork off sideband demultiplexer");
 290                 in = demux.out;
 291         }
 292
 293         if (new_refs && cmds_sent) {
 294                 if (pack_objects(out, remote_refs, extra_have, args) < 0) {
 295                         for (ref = remote_refs; ref; ref = ref->next)
 296                                 ref->status = REF_STATUS_NONE;
 297                         if (args->stateless_rpc)
 298                                 close(out);
 299                         if (git_connection_is_socket(conn))
 300                                 shutdown(fd[0], SHUT_WR);
 301                         if (use_sideband)
 302                                 finish_async(&demux);
 303                         return -1;
 304                 }
 305         }
 306         if (args->stateless_rpc && cmds_sent)
 307                 packet_flush(out);
 308
 309         if (status_report && cmds_sent)
 310                 ret = receive_status(in, remote_refs);
 311         else
 312                 ret = 0;
 313         if (args->stateless_rpc)
 314                 packet_flush(out);
 315
 316         if (use_sideband && cmds_sent) {
 317                 if (finish_async(&demux)) {
 318                         error("error in sideband demultiplexer");
 319                         ret = -1;
 320                 }
 321                 close(demux.out);
 322         }
 323
 324         if (ret < 0)
 325                 return ret;
 326
 327         if (args->porcelain)
 328                 return 0;
 329
 330         for (ref = remote_refs; ref; ref = ref->next) {
 331                 switch (ref->status) {
 332                 case REF_STATUS_NONE:
 333                 case REF_STATUS_UPTODATE:
 334                 case REF_STATUS_OK:
 335                         break;
 336                 default:
 337                         return -1;
 338                 }
 339         }
 340         return 0;
 341 }