Add VPN status to status bar

Signed-off-by: Knut Ahlers <knut@ahlers.me>

.config/i3blocks/config

@@ -56,8 +56,11 @@ interval=30
 [load]
 interval=30
 
+[vpn]
+interval=5
+
 [wifi]
-interval=30
+interval=5
 
 [battery]
 interval=10

.config/i3blocks/vpn

@@ -0,0 +1,45 @@
+#!/usr/bin/env python
+
+from pathlib import Path
+import subprocess
+import sys
+import yaml
+
+
+def check_ping_reachable(ip):
+    try:
+        subprocess.check_call(['ping', '-c2', ip],
+                              stdout=subprocess.DEVNULL,
+                              stderr=subprocess.DEVNULL)
+        return True
+    except subprocess.CalledProcessError:
+        return False
+
+
+def check_service_active(service):
+    try:
+        subprocess.check_call(['systemctl', 'status', service],
+                              stdout=subprocess.DEVNULL,
+                              stderr=subprocess.DEVNULL)
+        return True
+    except subprocess.CalledProcessError:
+        return False
+
+
+def main():
+    config = yaml.load(open(Path('~/.config/i3-vpn.json').expanduser()))
+    results = [config['prefix']]
+
+    for check in config['checks']:
+        if check_service_active(check['service']) and check_ping_reachable(check['ip']):
+            check['color'] = config['colors']['success']
+        else:
+            check['color'] = config['colors']['failure']
+
+        results.append(config['template'].format(**check))
+
+    print(' '.join(results))
+
+
+if __name__ == '__main__':
+    sys.exit(main())