do not update if nothing changed

diff --git a/ssh-dyndns b/ssh-dyndns
index 18fc5d9a14963034b3858472c0ed89c055ba17e9..00259d232e8e5e854d93d953c49f27e73287ee4c 100755 (executable)
--- a/ssh-dyndns
+++ b/ssh-dyndns
@@ -17,6 +17,7 @@ if [ -z "$remoteip" ]; then
    exit 2
 fi
 
    exit 2
 fi
 

+#TODO: support multiple domains

 if [ -z "$2" ]; then
     echo Missing argument: domain name
     exit 3
 if [ -z "$2" ]; then
     echo Missing argument: domain name
     exit 3


@@ -71,7 +72,19 @@ fi
 
 #=cweiske.de:5.35.241.22
 djbdnsline="=${domain}:${remoteip}:${timeout}"
 
 #=cweiske.de:5.35.241.22
 djbdnsline="=${domain}:${remoteip}:${timeout}"

-#FIXME: do not update if nothing changed
+
+update=1
+if [ -f "$datafile" ]; then
+    currentdata=`cat "$datafile"`
+    if [ "$currentdata" = "$djbdnsline" ]; then
+        #no need to update
+        update=0
+    fi
+fi
+if [ $update -eq 0 ]; then
+    exit
+fi
+

 echo $djbdnsline > $datafile
 
 #compile dns data
 echo $djbdnsline > $datafile
 
 #compile dns data