http_frontend: Make check mode usable.

roles/http_frontend/tasks/main.yml

@@ -17,23 +17,26 @@
   changed_when: false
   when: tmpdir.path is defined
 
-- name: Register checksum of httpd configuration file.
-  stat:
-    path: "{{ tmpdir.path }}/httpd-frontend.conf"
-    checksum_algorithm: sha256
-  register: r
+- name: Determine name for httpd configuration file.
+  block:
+  - name: Register checksum of httpd configuration file.
+    stat:
+      path: "{{ tmpdir.path }}/httpd-frontend.conf"
+      checksum_algorithm: sha256
+    register: r
+
+  - name: Calculate name.
+    set_fact:
+      _r2: "{{ http_frontend_name }}_\
+           httpd_frontend_config-\
+           {{ r.stat.checksum }}"
+
+  - name: Calculate shorter name.
+    set_fact:
+      httpd_frontend_config_name: "{{ _r2 | regex_replace('(.{,64}).*',
+                                   '\\1') }}"
   when: tmpdir.path is defined
 
-- name: Calculate name for configuration.
-  set_fact:
-    _r2: "{{ http_frontend_name }}_\
-         httpd_frontend_config-\
-         {{ r.stat.checksum }}"
-
-- name: Calculate shorter name for configuration.
-  set_fact:
-    httpd_frontend_config_name: "{{ _r2 | regex_replace('(.{,64}).*', '\\1') }}"
-
 - name: Copy landing page.
   template:
     dest: "{{ tmpdir.path }}/index.html"
@@ -43,23 +46,25 @@
   changed_when: false
   when: tmpdir.path is defined
 
-- name: Register checksum of landing page.
-  stat:
-    path: "{{ tmpdir.path }}/index.html"
-    checksum_algorithm: sha256
-  register: r
+- name: Determine name for landing page configuration file.
+  block:
+  - name: Register checksum of landing page.
+    stat:
+      path: "{{ tmpdir.path }}/index.html"
+      checksum_algorithm: sha256
+    register: r
+
+  - name: Calculate name.
+    set_fact:
+      _r2: "{{ http_frontend_name }}_\
+           index-\
+           {{ r.stat.checksum }}"
+
+  - name: Calculate shorter name.
+    set_fact:
+      index_name: "{{ _r2 | regex_replace('(.{,64}).*', '\\1') }}"
   when: tmpdir.path is defined
 
-- name: Calculate name for configuration.
-  set_fact:
-    _r2: "{{ http_frontend_name }}_\
-         index-\
-         {{ r.stat.checksum }}"
-
-- name: Calculate shorter name for configuration.
-  set_fact:
-    index_name: "{{ _r2 | regex_replace('(.{,64}).*', '\\1') }}"
-
 - name: Copy Dockerfile.
   copy:
     dest: "{{ tmpdir.path }}/Dockerfile"