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