protocol: introduce enum protocol_version value protocol_v2

diff --git a/builtin/fetch-pack.c b/builtin/fetch-pack.c
index 366b9d13f929b7d299a31d9c53fb643220fe64e3..b2374ddbbf58bb077423c32885a051c3405f6485 100644 (file)
--- a/builtin/fetch-pack.c
+++ b/builtin/fetch-pack.c
@@ -4,6 +4,7 @@
 #include "remote.h"
 #include "connect.h"
 #include "sha1-array.h"
+#include "protocol.h"
 
 static const char fetch_pack_usage[] =
 "git fetch-pack [--all] [--stdin] [--quiet | -q] [--keep | -k] [--thin] "
@@ -52,6 +53,7 @@ int cmd_fetch_pack(int argc, const char **argv, const char *prefix)
        struct fetch_pack_args args;
        struct oid_array shallow = OID_ARRAY_INIT;
        struct string_list deepen_not = STRING_LIST_INIT_DUP;
+       struct packet_reader reader;
 
        packet_trace_identity("fetch-pack");
 
@@ -193,7 +195,21 @@ int cmd_fetch_pack(int argc, const char **argv, const char *prefix)
                if (!conn)
                        return args.diag_url ? 0 : 1;
        }
-       get_remote_heads(fd[0], NULL, 0, &ref, 0, NULL, &shallow);
+
+       packet_reader_init(&reader, fd[0], NULL, 0,
+                          PACKET_READ_CHOMP_NEWLINE |
+                          PACKET_READ_GENTLE_ON_EOF);
+
+       switch (discover_version(&reader)) {
+       case protocol_v2:
+               die("support for protocol v2 not implemented yet");
+       case protocol_v1:
+       case protocol_v0:
+               get_remote_heads(&reader, &ref, 0, NULL, &shallow);
+               break;
+       case protocol_unknown_version:
+               BUG("unknown protocol version");
+       }
 
        ref = fetch_pack(&args, fd, conn, ref, dest, sought, nr_sought,
                         &shallow, pack_lockfile_ptr);