T1231: Remove cache file of 'service dns dynamic'

When deleting or changing "service dns dynamic" the cache file of ddclient
is not removed, leading to abandoned host names which might be already gone.

(cherry picked from commit ec604ef88e2845bcd75070f6dff325ccc50873aa)

1 files changed, 5 insertions, 1 deletions

diff --git a/src/conf_mode/dynamic_dns.py b/src/conf_mode/dynamic_dns.py
index 6f826c18f..ff3c1f825 100755
--- a/src/conf_mode/dynamic_dns.py
+++ b/src/conf_mode/dynamic_dns.py
@@ -24,6 +24,7 @@ from vyos.config import Config
 from vyos import ConfigError
 
 config_file = r'/etc/ddclient.conf'
+cache_file = r'/var/cache/ddclient/ddclient.cache'
 
 config_tmpl = """
 ### Autogenerated by dynamic_dns.py ###
@@ -151,7 +152,7 @@ def get_config():
                 'server': '',
                 'custom' : False
             }
-            
+
             # preload protocol from default service mapping
             if service in default_service_protocol.keys():
                 srv['protocol'] = default_service_protocol[service]
@@ -245,6 +246,9 @@ def generate(dyndns):
     return None
 
 def apply(dyndns):
+    if os.path.exists(cache_file):
+        os.unlink(cache_file)
+
     if dyndns is None:
         os.system('/etc/init.d/ddclient stop')
     else: