T6492: Check if all migrators have the executable bit set

Makefile

@@ -78,7 +78,7 @@ vyshim:
 	$(MAKE) -C $(SHIM_DIR)
 
 .PHONY: all
-all: clean interface_definitions op_mode_definitions check test j2lint vyshim
+all: clean interface_definitions op_mode_definitions check test j2lint vyshim migration_scripts
 
 .PHONY: check
 .ONESHELL:
@@ -103,6 +103,12 @@ test:
 	set -e; python3 -m compileall -q -x '/vmware-tools/scripts/, /ppp/' .
 	PYTHONPATH=python/ python3 -m "nose" --with-xunit src --with-coverage --cover-erase --cover-xml --cover-package src/conf_mode,src/op_mode,src/completion,src/helpers,src/validators,src/tests --verbose
 
+.PHONY: migration_scripts
+.ONESHELL:
+migration_scripts:
+	@echo "Checking if migration scripts have executable bit set..."
+	find src/migration-scripts -type f -not -executable -print -exec false {} + || sh -c 'echo "Found files that are not executable! Add permissions." && exit 1'
+
 .PHONY: j2lint
 j2lint:
 ifndef J2LINT