RPC: add version check interface

Instead of parsing the output of 'criu -V' this offers a RPC interface
to get CRIU's version. In a follow up patch a test script is included
to use the new interface:

 ./version.py
 Connecting to CRIU in swrk mode to check the version:
 RPC: Success
 CRIU major 2
 CRIU minor 12
 CRIU gitid v2.12-635-g6d3ae4d

This change exports the following version fields:
 * major
 * minor
 * gitid (optional)
 * sublevel (optional)
 * extra (optional)
 * name (optional)

The optional gitid field is not set when CRIU is not built from git.

Signed-off-by: Adrian Reber <areber@redhat.com>
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>

1 files changed, 13 insertions, 0 deletions

diff --git a/images/rpc.proto b/images/rpc.proto
index 394469ad8..2c65617aa 100644
--- a/images/rpc.proto
+++ b/images/rpc.proto
@@ -139,6 +139,8 @@ enum criu_req_type {
 	CPUINFO_CHECK	= 8;
 
 	FEATURE_CHECK	= 9;
+
+	VERSION		= 10;
 }
 
 /*
@@ -191,4 +193,15 @@ message criu_resp {
 	optional int32			cr_errno	= 7;
 	optional criu_features		features	= 8;
 	optional string			cr_errmsg	= 9;
+	optional criu_version		version		= 10;
+}
+
+/* Answer for criu_req_type.VERSION requests */
+message criu_version {
+	required int32			major		= 1;
+	required int32			minor		= 2;
+	optional string			gitid		= 3;
+	optional int32			sublevel	= 4;
+	optional int32			extra		= 5;
+	optional string			name		= 6;
 }