Merge "Use a tempfile for the modified Dockerfile"

tasks/modify_image.yml

@@ -13,25 +13,31 @@
     modified_append_tag: "{{ lookup('pipe','date +-modified-%Y%m%d%H%M%S') }}"
   when: modified_append_tag is undefined
 
-- name: Copy Dockerfile to Dockerfile.modified
+- name: Create Dockerfile tempfile name
+  tempfile:
+    path: "{{ modify_dir_path }}"
+    prefix: Dockerfile.
+  register: dockerfile
+
+- name: Copy Dockerfile to {{ dockerfile.path }}
   copy:
     src: "{{ modify_dir_path }}/Dockerfile"
-    dest: "{{ modify_dir_path }}/Dockerfile.modified"
+    dest: "{{ dockerfile.path }}"
 
 - name: Replace FROM directive
   lineinfile:
-    path: "{{ modify_dir_path }}/Dockerfile.modified"
+    path: "{{ dockerfile.path }}"
     regexp: "^FROM "
     line: "FROM {{ source_image }}"
 
 - name: Add LABEL modified_append_tag={{ modified_append_tag }}
   lineinfile:
-    path: "{{ modify_dir_path }}/Dockerfile.modified"
+    path: "{{ dockerfile.path }}"
     insertafter: "^FROM "
     line: "LABEL modified_append_tag={{ modified_append_tag }}"
 
 - name: Modify image from {{ modify_dir_path }}
-  command: "{{ build_commands[container_build_tool] }} --tag {{ target_image | default(source_image) }}{{ modified_append_tag }} --file Dockerfile.modified --network host ./"
+  command: "{{ build_commands[container_build_tool] }} --tag {{ target_image | default(source_image) }}{{ modified_append_tag }} --file {{ dockerfile.path }} --network host ./"
   #FIXME: buildah should not required root commands to build an image
   become: "{{ true if build_commands[container_build_tool] == 'buildah' else false }}"
   args: