[hostcfgd] Handle Both Service And Timer Units (#5228)

Commit e484ae9 introduced systemd .timer unit to hostcfgd.
However, when stopping service that has timer, there is possibility that
timer is not running and the service would not be stopped. This PR
address this situation by handling both .timer and .service units.

signed-off-by: Tamer Ahmed <tamer.ahmed@microsoft.com>

files/image_config/hostcfgd/hostcfgd

@@ -42,12 +42,15 @@ def obfuscate(data):
 
 
 def update_feature_state(feature_name, state, has_timer=False):
-    feature_suffix = "timer" if has_timer else "service"
+    feature_suffixes = ["service"] + (["timer"] if has_timer else [])
     if state == "enabled":
         start_cmds = []
-        start_cmds.append("sudo systemctl unmask {}.{}".format(feature_name, feature_suffix))
-        start_cmds.append("sudo systemctl enable {}.{}".format(feature_name, feature_suffix))
-        start_cmds.append("sudo systemctl start {}.{}".format(feature_name, feature_suffix))
+        for suffix in feature_suffixes:
+            start_cmds.append("sudo systemctl unmask {}.{}".format(feature_name, suffix))
+            start_cmds.append("sudo systemctl enable {}.{}".format(feature_name, suffix))
+        # If feature has timer associated with it, start corresponding systemd .timer unit
+        # otherwise, start corresponding systemd .service unit
+        start_cmds.append("sudo systemctl start {}.{}".format(feature_name, feature_suffixes[-1]))
         for cmd in start_cmds:
             syslog.syslog(syslog.LOG_INFO, "Running cmd: '{}'".format(cmd))
             try:
@@ -56,12 +59,14 @@ def update_feature_state(feature_name, state, has_timer=False):
                 syslog.syslog(syslog.LOG_ERR, "'{}' failed. RC: {}, output: {}"
                               .format(err.cmd, err.returncode, err.output))
                 continue
-        syslog.syslog(syslog.LOG_INFO, "Feature '{}.{}' is enabled and started".format(feature_name, feature_suffix))
+        syslog.syslog(syslog.LOG_INFO, "Feature '{}.{}' is enabled and started"
+                      .format(feature_name, feature_suffixes[-1]))
     elif state == "disabled":
         stop_cmds = []
-        stop_cmds.append("sudo systemctl stop {}.{}".format(feature_name, feature_suffix))
-        stop_cmds.append("sudo systemctl disable {}.{}".format(feature_name, feature_suffix))
-        stop_cmds.append("sudo systemctl mask {}.{}".format(feature_name, feature_suffix))
+        for suffix in reversed(feature_suffixes):
+            stop_cmds.append("sudo systemctl stop {}.{}".format(feature_name, suffix))
+            stop_cmds.append("sudo systemctl disable {}.{}".format(feature_name, suffix))
+            stop_cmds.append("sudo systemctl mask {}.{}".format(feature_name, suffix))
         for cmd in stop_cmds:
             syslog.syslog(syslog.LOG_INFO, "Running cmd: '{}'".format(cmd))
             try:
@@ -72,8 +77,8 @@ def update_feature_state(feature_name, state, has_timer=False):
                 continue
         syslog.syslog(syslog.LOG_INFO, "Feature '{}' is stopped and disabled".format(feature_name))
     else:
-        syslog.syslog(syslog.LOG_ERR, "Unexpected state value '{}' for feature '{}.{}'"
-                      .format(state, feature_name, feature_suffix))
+        syslog.syslog(syslog.LOG_ERR, "Unexpected state value '{}' for feature '{}'"
+                      .format(state, feature_name))
 
 
 class Iptables(object):