Now .out-of-tree.toml can also define version of distro

main.go

@@ -28,8 +28,9 @@ import (
 )
 
 type kernelMask struct {
-	DistroType  distroType
+	DistroType    distroType
-	ReleaseMask string
+	DistroRelease string // 18.04/7.4.1708/9.1
+	ReleaseMask   string
 }
 
 type artifactType int
@@ -71,6 +72,12 @@ func (ka artifact) checkSupport(ki kernelInfo, km kernelMask) (
 		return
 	}
 
+	// DistroRelease is optional
+	if km.DistroRelease != "" && ki.DistroRelease != km.DistroRelease {
+		supported = false
+		return
+	}
+
 	supported, err = regexp.MatchString(km.ReleaseMask, ki.KernelRelease)
 	return
 }