etcd: compatibility with check mode (#470)

roles/etcd/tasks/main.yml

@@ -44,7 +44,10 @@
       loop:
         - etcd
         - etcdctl
-  when: installation_method == "repo" and etcd_package_repo | length > 0
+  when:
+    - installation_method == "repo"
+    - etcd_package_repo | length > 0
+    - not ansible_check_mode
   tags: etcd, etcd_install
 
 - block:  # install etcd package from file
@@ -64,7 +67,10 @@
       loop:
         - etcd
         - etcdctl
-  when: installation_method == "file" and etcd_package_file | length > 0
+  when:
+    - installation_method == "file"
+    - etcd_package_file | length > 0
+    - not ansible_check_mode
   tags: etcd, etcd_install
 
 - name: Add etcd user
@@ -123,17 +129,24 @@
       ansible.builtin.command: >
         /usr/local/bin/etcdctl endpoint health
         --endpoints=http://{{ inventory_hostname }}:2379
+      environment:
+        ETCDCTL_API: "3"
       register: etcd_health_result
-      until: "'is healthy' in etcd_health_result.stdout"
+      until: >
+        'is healthy' in etcd_health_result.stdout or
+        'is healthy' in etcd_health_result.stderr
       retries: 10
       delay: 10
       changed_when: false
       ignore_errors: false
-      check_mode: false
 
     - name: cluster health
       ansible.builtin.debug:
-        msg: "{{ etcd_health_result.stdout }}"
+        msg: >
+          {{ etcd_health_result.stdout
+          if etcd_health_result.stdout | length > 0
+          else etcd_health_result.stderr }}
+  when: not ansible_check_mode
   tags: etcd, etcd_start, etcd_status
 
 ...