Define this in one place to make it easy to re-use.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
---
 tests/docker/Makefile.include | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/tests/docker/Makefile.include b/tests/docker/Makefile.include
index de87341528..6a5aa9ec71 100644
--- a/tests/docker/Makefile.include
+++ b/tests/docker/Makefile.include
@@ -14,6 +14,8 @@ DOCKER_TESTS := $(notdir $(shell \
 
 DOCKER_TOOLS := travis
 
+DOCKER_SCRIPT=$(SRC_PATH)/tests/docker/docker.py
+
 TESTS ?= %
 IMAGES ?= %
 
@@ -37,7 +39,7 @@ docker-image-%: $(DOCKER_FILES_DIR)/%.docker
 		echo WARNING: EXECUTABLE is not set, debootstrap may fail. 2>&1 ; \
 	fi
 	$(call quiet-command,\
-		$(SRC_PATH)/tests/docker/docker.py build qemu:$* $< \
+		$(DOCKER_SCRIPT) build qemu:$* $< \
 		$(if $V,,--quiet) $(if $(NOCACHE),--no-cache) \
 		$(if $(NOUSER),,--add-current-user) \
 		$(if $(EXTRA_FILES),--extra-files $(EXTRA_FILES))\
@@ -129,11 +131,11 @@ docker-run: docker-qemu-src
 	fi
 	$(if $(EXECUTABLE),						\
 		$(call quiet-command,					\
-			$(SRC_PATH)/tests/docker/docker.py update 	\
+			$(DOCKER_SCRIPT) update 			\
 			$(IMAGE) $(EXECUTABLE),				\
 			"  COPYING $(EXECUTABLE) to $(IMAGE)"))
 	$(call quiet-command,						\
-		$(SRC_PATH)/tests/docker/docker.py run 			\
+		$(DOCKER_SCRIPT) run 					\
 			$(if $(NOUSER),,-u $(shell id -u)) 		\
 			--security-opt seccomp=unconfined		\
 			$(if $V,,--rm) 					\
@@ -163,4 +165,4 @@ docker-run-%:
 	@$(MAKE) docker-run TEST=$(CMD) IMAGE=qemu:$(IMAGE)
 
 docker-clean:
-	$(call quiet-command, $(SRC_PATH)/tests/docker/docker.py clean)
+	$(call quiet-command, $(DOCKER_SCRIPT) clean)
-- 
2.17.0