dracut.module: Put env guards inside rule so install works without

dracut.module/Makefile

-guard-%:
-	@ if [ "${${*}}" = "" ]; then \
+dracut_module: 90metadata-collect/metadata-collect-agent 90metadata-collect/collect.sh
+
+include collect-sh-template.mk
+90metadata-collect/collect.sh:
+	@ if [ "${ERP5_USER}" = "" ]; then \
+		echo "Environment variable $* not set"; \
+		exit 1; \
+	fi
+	@ if [ "${ERP5_PASS}" = "" ]; then \
+		echo "Environment variable $* not set"; \
+		exit 1; \
+	fi
+	@ if [ "${ERP5_BASE_URL}" = "" ]; then \
 		echo "Environment variable $* not set"; \
 		exit 1; \
 	fi
 
-include collect-sh-template.mk
-90metadata-collect/collect.sh: guard-ERP5_USER guard-ERP5_PASS guard-ERP5_BASE_URL
 	echo "$${collect_sh}" >> 90metadata-collect/collect.sh
 
 90metadata-collect/metadata-collect-agent:
@@ -16,7 +25,7 @@ clean:
 	rm -fv 90metadata-collect/collect.sh 90metadata-collect/metadata-collect-agent
 
 .PHONY: install
-install: 90metadata-collect/metadata-collect-agent 90metadata-collect/collect.sh
+install: dracut_module
 	cp -vLr "90metadata-collect" /usr/lib/dracut/modules.d
 
 .PHONY: uninstall