pacemaker_cluster: fix run_command() calls (#9471)

* pacemaker_cluster: fix run_command() calls

* add changelog frag

* remove set_node()

changelogs/fragments/9387-pacemaker-cluster-cmd.yml

@@ -0,0 +1,3 @@
+minor_changes:
+  - pacemaker_cluster - using safer mechanism to run external command (https://github.com/ansible-collections/community.general/pull/9471).
+  - pacemaker_cluster - remove unused code (https://github.com/ansible-collections/community.general/pull/9471).

plugins/modules/pacemaker_cluster.py

@@ -71,7 +71,7 @@ _PCS_CLUSTER_DOWN = "Error: cluster is not currently running on this node"
 
 
 def get_cluster_status(module):
-    cmd = "pcs cluster status"
+    cmd = ["pcs", "cluster", "status"]
     rc, out, err = module.run_command(cmd)
     if out in _PCS_CLUSTER_DOWN:
         return 'offline'
@@ -80,10 +80,8 @@ def get_cluster_status(module):
 
 
 def get_node_status(module, node='all'):
-    if node == 'all':
+    node_l = ["all"] if node == "all" else []
-        cmd = "pcs cluster pcsd-status %s" % node
+    cmd = ["pcs", "cluster", "pcsd-status"] + node_l
-    else:
-        cmd = "pcs cluster pcsd-status"
     rc, out, err = module.run_command(cmd)
     if rc == 1:
         module.fail_json(msg="Command execution failed.\nCommand: `%s`\nError: %s" % (cmd, err))
@@ -94,7 +92,7 @@ def get_node_status(module, node='all'):
 
 
 def clean_cluster(module, timeout):
-    cmd = "pcs resource cleanup"
+    cmd = ["pcs", "resource", "cleanup"]
     rc, out, err = module.run_command(cmd)
     if rc == 1:
         module.fail_json(msg="Command execution failed.\nCommand: `%s`\nError: %s" % (cmd, err))
@@ -102,11 +100,11 @@ def clean_cluster(module, timeout):
 
 def set_cluster(module, state, timeout, force):
     if state == 'online':
-        cmd = "pcs cluster start"
+        cmd = ["pcs", "cluster", "start"]
     if state == 'offline':
-        cmd = "pcs cluster stop"
+        cmd = ["pcs", "cluster", "stop"]
         if force:
-            cmd = "%s --force" % cmd
+            cmd = cmd + ["--force"]
     rc, out, err = module.run_command(cmd)
     if rc == 1:
         module.fail_json(msg="Command execution failed.\nCommand: `%s`\nError: %s" % (cmd, err))
@@ -122,35 +120,6 @@ def set_cluster(module, state, timeout, force):
         module.fail_json(msg="Failed to set the state `%s` on the cluster\n" % (state))
 
 
-def set_node(module, state, timeout, force, node='all'):
-    # map states
-    if state == 'online':
-        cmd = "pcs cluster start"
-    if state == 'offline':
-        cmd = "pcs cluster stop"
-        if force:
-            cmd = "%s --force" % cmd
-
-    nodes_state = get_node_status(module, node)
-    for node in nodes_state:
-        if node[1].strip().lower() != state:
-            cmd = "%s %s" % (cmd, node[0].strip())
-            rc, out, err = module.run_command(cmd)
-            if rc == 1:
-                module.fail_json(msg="Command execution failed.\nCommand: `%s`\nError: %s" % (cmd, err))
-
-    t = time.time()
-    ready = False
-    while time.time() < t + timeout:
-        nodes_state = get_node_status(module)
-        for node in nodes_state:
-            if node[1].strip().lower() == state:
-                ready = True
-                break
-    if not ready:
-        module.fail_json(msg="Failed to set the state `%s` on the cluster\n" % (state))
-
-
 def main():
     argument_spec = dict(
         state=dict(type='str', choices=['online', 'offline', 'restart', 'cleanup']),
@@ -198,7 +167,7 @@ def main():
                     cluster_state = get_node_status(module, node)
                     module.exit_json(changed=True, out=cluster_state)
 
-    if state in ['restart']:
+    elif state == 'restart':
         if module.check_mode:
             module.exit_json(changed=True)
         set_cluster(module, 'offline', timeout, force)
@@ -209,17 +178,16 @@ def main():
             if cluster_state == 'online':
                 module.exit_json(changed=True, out=cluster_state)
             else:
-                module.fail_json(msg="Failed during the restart of the cluster, the cluster can't be started")
+                module.fail_json(msg="Failed during the restart of the cluster, the cluster cannot be started")
         else:
-            module.fail_json(msg="Failed during the restart of the cluster, the cluster can't be stopped")
+            module.fail_json(msg="Failed during the restart of the cluster, the cluster cannot be stopped")
 
-    if state in ['cleanup']:
+    elif state == 'cleanup':
         if module.check_mode:
             module.exit_json(changed=True)
         clean_cluster(module, timeout)
         cluster_state = get_cluster_status(module)
-        module.exit_json(changed=True,
+        module.exit_json(changed=True, out=cluster_state)
-                         out=cluster_state)
 
 
 if __name__ == '__main__':