Check if tor is installed before running some commands.

actions/tor

@@ -34,6 +34,10 @@ def parse_arguments():
     parser = argparse.ArgumentParser()
     subparsers = parser.add_subparsers(dest='subcommand', help='Sub command')
 
+    # Get whether Tor is installed
+    subparsers.add_parser('get-installed',
+                          help='Get whether Tor is installed')
+
     # Get whether Tor is running
     subparsers.add_parser('is-running', help='Get whether Tor is running')
 
@@ -55,6 +59,11 @@ def parse_arguments():
     return parser.parse_args()
 
 
+def subcommand_get_installed(_):
+    """Get whether Tor is installed"""
+    print('installed' if get_installed() else 'not installed')
+
+
 def subcommand_is_running(_):
     """Get whether Tor is running"""
     try:
@@ -92,7 +101,7 @@ def subcommand_get_hs(_):
 
 def subcommand_enable_hs(_):
     """Enable Tor hidden service"""
-    if get_hidden_service():
+    if not get_installed() or get_hidden_service():
         return
 
     with open(TOR_CONFIG, 'r') as conffile:
@@ -112,7 +121,7 @@ def subcommand_enable_hs(_):
 
 def subcommand_disable_hs(_):
     """Disable Tor hidden service"""
-    if not get_hidden_service():
+    if not get_installed() or not get_hidden_service():
         return
 
     with open(TOR_CONFIG, 'r') as conffile:
@@ -145,8 +154,19 @@ def subcommand_disable_hs(_):
     subprocess.call(['service', 'tor', 'restart'])
 
 
+def get_installed():
+    """Get whether Tor is installed"""
+    with open('/dev/null', 'w') as file_handle:
+        status = subprocess.call(['which', 'tor'], stdout=file_handle)
+
+    return not status
+
+
 def set_tor_service(enable):
     """Enable/disable Tor service; enable: boolean"""
+    if not get_installed():
+        return
+
     newline = 'RUN_DAEMON="yes"\n' if enable else 'RUN_DAEMON="no"\n'
 
     with open(SERVICE_CONFIG, 'r') as file:
@@ -162,6 +182,9 @@ def set_tor_service(enable):
 
 def get_hidden_service():
     """Return a string with configured Tor hidden service information"""
+    if not get_installed():
+        return ''
+
     hs_dir = None
     hs_ports = []