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         char line[1000];
 110         int ret = 0;
 111         int len = packet_read_line(in, line, sizeof(line));
 112         if (len < 10 || memcmp(line, "unpack ", 7))
 113                 return error("did not receive remote status");
 114         if (memcmp(line, "unpack ok\n", 10)) {
 115                 char *p = line + strlen(line) - 1;
 116                 if (*p == '\n')
 117                         *p = '\0';
 118                 error("unpack failed: %s", line + 7);
 119                 ret = -1;
 120         }
 121         hint = NULL;
 122         while (1) {
 123                 char *refname;
 124                 char *msg;
 125                 len = packet_read_line(in, line, sizeof(line));
 126                 if (!len)
 127                         break;
 128                 if (len < 3 ||
 129                     (memcmp(line, "ok ", 3) && memcmp(line, "ng ", 3))) {
 130                         fprintf(stderr, "protocol error: %s\n", line);
 131                         ret = -1;
 132                         break;
 133                 }
 134
 135                 line[strlen(line)-1] = '\0';
 136                 refname = line + 3;
 137                 msg = strchr(refname, ' ');
 138                 if (msg)
 139                         *msg++ = '\0';
 140
 141                 /* first try searching at our hint, falling back to all refs */
 142                 if (hint)
 143                         hint = find_ref_by_name(hint, refname);
 144                 if (!hint)
 145                         hint = find_ref_by_name(refs, refname);
 146                 if (!hint) {
 147                         warning("remote reported status on unknown ref: %s",
 148                                         refname);
 149                         continue;
 150                 }
 151                 if (hint->status != REF_STATUS_EXPECTING_REPORT) {
 152                         warning("remote reported status on unexpected ref: %s",
 153                                         refname);
 154                         continue;
 155                 }
 156
 157                 if (line[0] == 'o' && line[1] == 'k')
 158                         hint->status = REF_STATUS_OK;
 159                 else {
 160                         hint->status = REF_STATUS_REMOTE_REJECT;
 161                         ret = -1;
 162                 }
 163                 if (msg)
 164                         hint->remote_status = xstrdup(msg);
 165                 /* start our next search from the next ref */
 166                 hint = hint->next;
 167         }
 168         return ret;
 169 }
 170
 171 static int sideband_demux(int in, int out, void *data)
 172 {
 173         int *fd = data, ret;
 174 #ifdef NO_PTHREADS
 175         close(fd[1]);
 176 #endif
 177         ret = recv_sideband("send-pack", fd[0], out);
 178         close(out);
 179         return ret;
 180 }
 181
 182 int send_pack(struct send_pack_args *args,
 183               int fd[], struct child_process *conn,
 184               struct ref *remote_refs,
 185               struct extra_have_objects *extra_have)
 186 {
 187         int in = fd[0];
 188         int out = fd[1];
 189         struct strbuf req_buf = STRBUF_INIT;
 190         struct ref *ref;
 191         int new_refs;
 192         int allow_deleting_refs = 0;
 193         int status_report = 0;
 194         int use_sideband = 0;
 195         int quiet_supported = 0;
 196         int agent_supported = 0;
 197         unsigned cmds_sent = 0;
 198         int ret;
 199         struct async demux;
 200
 201         /* Does the other end support the reporting? */
 202         if (server_supports("report-status"))
 203                 status_report = 1;
 204         if (server_supports("delete-refs"))
 205                 allow_deleting_refs = 1;
 206         if (server_supports("ofs-delta"))
 207                 args->use_ofs_delta = 1;
 208         if (server_supports("side-band-64k"))
 209                 use_sideband = 1;
 210         if (server_supports("quiet"))
 211                 quiet_supported = 1;
 212         if (server_supports("agent"))
 213                 agent_supported = 1;
 214
 215         if (!remote_refs) {
 216                 fprintf(stderr, "No refs in common and none specified; doing nothing.\n"
 217                         "Perhaps you should specify a branch such as 'master'.\n");
 218                 return 0;
 219         }
 220
 221         /*
 222          * Finally, tell the other end!
 223          */
 224         new_refs = 0;
 225         for (ref = remote_refs; ref; ref = ref->next) {
 226                 if (!ref->peer_ref && !args->send_mirror)
 227                         continue;
 228
 229                 /* Check for statuses set by set_ref_status_for_push() */
 230                 switch (ref->status) {
 231                 case REF_STATUS_REJECT_NONFASTFORWARD:
 232                 case REF_STATUS_REJECT_ALREADY_EXISTS:
 233                 case REF_STATUS_REJECT_FETCH_FIRST:
 234                 case REF_STATUS_REJECT_NEEDS_FORCE:
 235                 case REF_STATUS_UPTODATE:
 236                         continue;
 237                 default:
 238                         ; /* do nothing */
 239                 }
 240
 241                 if (ref->deletion && !allow_deleting_refs) {
 242                         ref->status = REF_STATUS_REJECT_NODELETE;
 243                         continue;
 244                 }
 245
 246                 if (!ref->deletion)
 247                         new_refs++;
 248
 249                 if (args->dry_run) {
 250                         ref->status = REF_STATUS_OK;
 251                 } else {
 252                         char *old_hex = sha1_to_hex(ref->old_sha1);
 253                         char *new_hex = sha1_to_hex(ref->new_sha1);
 254                         int quiet = quiet_supported && (args->quiet || !args->progress);
 255
 256                         if (!cmds_sent && (status_report || use_sideband ||
 257                                            quiet || agent_supported)) {
 258                                 packet_buf_write(&req_buf,
 259                                                  "%s %s %s%c%s%s%s%s%s",
 260                                                  old_hex, new_hex, ref->name, 0,
 261                                                  status_report ? " report-status" : "",
 262                                                  use_sideband ? " side-band-64k" : "",
 263                                                  quiet ? " quiet" : "",
 264                                                  agent_supported ? " agent=" : "",
 265                                                  agent_supported ? git_user_agent_sanitized() : ""
 266                                                 );
 267                         }
 268                         else
 269                                 packet_buf_write(&req_buf, "%s %s %s",
 270                                                  old_hex, new_hex, ref->name);
 271                         ref->status = status_report ?
 272                                 REF_STATUS_EXPECTING_REPORT :
 273                                 REF_STATUS_OK;
 274                         cmds_sent++;
 275                 }
 276         }
 277
 278         if (args->stateless_rpc) {
 279                 if (!args->dry_run && cmds_sent) {
 280                         packet_buf_flush(&req_buf);
 281                         send_sideband(out, -1, req_buf.buf, req_buf.len, LARGE_PACKET_MAX);
 282                 }
 283         } else {
 284                 safe_write(out, req_buf.buf, req_buf.len);
 285                 packet_flush(out);
 286         }
 287         strbuf_release(&req_buf);
 288
 289         if (use_sideband && cmds_sent) {
 290                 memset(&demux, 0, sizeof(demux));
 291                 demux.proc = sideband_demux;
 292                 demux.data = fd;
 293                 demux.out = -1;
 294                 if (start_async(&demux))
 295                         die("send-pack: unable to fork off sideband demultiplexer");
 296                 in = demux.out;
 297         }
 298
 299         if (new_refs && cmds_sent) {
 300                 if (pack_objects(out, remote_refs, extra_have, args) < 0) {
 301                         for (ref = remote_refs; ref; ref = ref->next)
 302                                 ref->status = REF_STATUS_NONE;
 303                         if (args->stateless_rpc)
 304                                 close(out);
 305                         if (git_connection_is_socket(conn))
 306                                 shutdown(fd[0], SHUT_WR);
 307                         if (use_sideband)
 308                                 finish_async(&demux);
 309                         return -1;
 310                 }
 311         }
 312         if (args->stateless_rpc && cmds_sent)
 313                 packet_flush(out);
 314
 315         if (status_report && cmds_sent)
 316                 ret = receive_status(in, remote_refs);
 317         else
 318                 ret = 0;
 319         if (args->stateless_rpc)
 320                 packet_flush(out);
 321
 322         if (use_sideband && cmds_sent) {
 323                 if (finish_async(&demux)) {
 324                         error("error in sideband demultiplexer");
 325                         ret = -1;
 326                 }
 327                 close(demux.out);
 328         }
 329
 330         if (ret < 0)
 331                 return ret;
 332
 333         if (args->porcelain)
 334                 return 0;
 335
 336         for (ref = remote_refs; ref; ref = ref->next) {
 337                 switch (ref->status) {
 338                 case REF_STATUS_NONE:
 339                 case REF_STATUS_UPTODATE:
 340                 case REF_STATUS_OK:
 341                         break;
 342                 default:
 343                         return -1;
 344                 }
 345         }
 346         return 0;
 347 }