gen_certs_script: refactor using stdin (Ansible 2.4+)

roles/etcd/tasks/gen_certs_script.yml

@@ -94,9 +94,9 @@
     - facts
 
 - name: Gen_certs | Gather etcd master certs
-  shell: "tar cfz - -C {{ etcd_cert_dir }} -T /dev/stdin <<< {{ my_master_certs|join(' ') }} {{ all_node_certs|join(' ') }} | base64 --wrap=0"
+  command: "tar cfz - -C {{ etcd_cert_dir }} -T /dev/stdin"
   args:
-    executable: /bin/bash
+    input: "{{ my_master_certs|join(' ') }} {{ all_node_certs|join(' ') }}"
   register: etcd_master_cert_data
   no_log: true
   check_mode: no
@@ -106,9 +106,9 @@
   notify: set etcd_secret_changed
 
 - name: Gen_certs | Gather etcd node certs
-  shell: "tar cfz - -C {{ etcd_cert_dir }} -T /dev/stdin <<< {{ my_node_certs|join(' ') }} | base64 --wrap=0"
+  command: "tar cfz - -C {{ etcd_cert_dir }} -T /dev/stdin"
   args:
-    executable: /bin/bash
+    stdin: "{{ my_node_certs|join(' ') }}"
   register: etcd_node_cert_data
   no_log: true
   check_mode: no
@@ -118,27 +118,10 @@
         sync_certs|default(false) and inventory_hostname not in groups['etcd']
   notify: set etcd_secret_changed
 
-# NOTE(mattymo): Use temporary file to copy master certs because we have a ~200k
-# char limit when using shell command
-
-# FIXME(mattymo): Use tempfile module in ansible 2.3
-- name: Gen_certs | Prepare tempfile for unpacking certs
-  command: mktemp /tmp/certsXXXXX.tar.gz
-  register: cert_tempfile
-  when: inventory_hostname in groups['etcd'] and sync_certs|default(false) and
-        inventory_hostname != groups['etcd'][0]
-
-- name: Gen_certs | Write master certs to tempfile
-  copy:
-    content: "{{etcd_master_cert_data.stdout}}"
-    dest: "{{cert_tempfile.stdout}}"
-    owner: root
-    mode: "0600"
-  when: inventory_hostname in groups['etcd'] and sync_certs|default(false) and
-        inventory_hostname != groups['etcd'][0]
-
 - name: Gen_certs | Unpack certs on masters
-  shell: "base64 -d < {{ cert_tempfile.stdout }} | tar xz -C {{ etcd_cert_dir }}"
+  command: "tar xz -C {{ etcd_cert_dir }}"
+  args:
+    stdin: "{{ etcd_master_cert_data.stdout }}"
   no_log: true
   changed_when: false
   check_mode: no
@@ -146,17 +129,11 @@
         inventory_hostname != groups['etcd'][0]
   notify: set secret_changed
 
-- name: Gen_certs | Cleanup tempfile
-  file:
-    path: "{{cert_tempfile.stdout}}"
-    state: absent
-  when: inventory_hostname in groups['etcd'] and sync_certs|default(false) and
-        inventory_hostname != groups['etcd'][0]
-
 - name: Gen_certs | Copy certs on nodes
-  shell: "base64 -d <<< '{{etcd_node_cert_data.stdout|quote}}' | tar xz -C {{ etcd_cert_dir }}"
+  command: "tar xz -C {{ etcd_cert_dir }}"
   args:
-    executable: /bin/bash
+    stdin: "{{ etcd_node_cert_data.stdout }}"
+  no_log: true
   changed_when: false
   when: sync_certs|default(false) and
         inventory_hostname not in groups['etcd']