Validate dockerfilepath in buildconfig

This PR will resolve #594 by validating dockerfilepath based on whether
it is relative path or not.

pkg/loader/compose/compose.go

@@ -330,6 +330,11 @@ func (c *Compose) LoadFile(files []string) (kobject.KomposeObject, error) {
 		envs := loadEnvVars(composeServiceConfig.Environment)
 		serviceConfig.Environment = envs
 
+		//Validate dockerfile path
+		if filepath.IsAbs(serviceConfig.Dockerfile) {
+			log.Fatalf("%q defined in service %q is an absolute path, it must be a relative path.", serviceConfig.Dockerfile, name)
+		}
+
 		// load ports
 		ports, err := loadPorts(composeServiceConfig.Ports)
 		if err != nil {

script/test/cmd/tests.sh

@@ -197,6 +197,8 @@ convert::expect_success_and_warning "kompose -f $KOMPOSE_ROOT/script/test/fixtur
 # Openshift Test
 convert::expect_success_and_warning "kompose --provider openshift -f $KOMPOSE_ROOT/script/test/fixtures/service-name-change/docker-compose.yml convert --stdout -j" "$KOMPOSE_ROOT/script/test/fixtures/service-name-change/output-os.json" "Unsupported root level volumes key - ignoring"
 
+# Test regarding validating dockerfilepath
+convert::expect_failure "kompose -f $KOMPOSE_ROOT/script/test/fixtures/dockerfilepath/docker-compose.yml convert --stdout"
 
 ######
 # Test the output file behavior of kompose convert

script/test/fixtures/dockerfilepath/docker-compose.yml

@@ -0,0 +1,8 @@
+version: "2"
+
+services:
+ foo:
+  build:
+   context: "../../script/test_in_openshift/buildconfig"
+   dockerfile: "/Dockerfile"
+  command: "sleep 120"