proto/config: User as extensions

Signed-off-by: Vincent Batts <vbatts@hashbangbash.com>

proto/config.proto

@@ -72,17 +72,8 @@ message User {
 	// expected
 	optional PlatformType type = 1;
 
-	optional LinuxUser linux_type = 2;
-}
-
-// LinuxUser specifies linux specific user and group information for the
-// container's main process.
-message LinuxUser {
-	// Uid is the user id.
-	optional int32 uid = 1;
-	// Gid is the group id.
-	optional int32 gid = 2;
-	repeated int32 additional_gids = 3;
+	//optional LinuxUser linux_type = 2;
+	extensions 100 to 499;
 }
 
 // Root contains information about the container's root filesystem on the host.

proto/config_linux.proto

@@ -0,0 +1,14 @@
+package oci;
+
+import "config.proto";
+
+// LinuxUser specifies linux specific user and group information for the
+// container's main process.
+extend oci.User {
+	// Uid is the user id.
+	optional int32 uid = 101;
+	// Gid is the group id.
+	optional int32 gid = 102;
+	repeated int32 additional_gids = 103;
+}
+