xmpp logging conditions

src/freedombone-app-xmpp

             mkdir /var/log/prosody
             chown root:adm /var/log/prosody
         fi
-        sed -i 's|info = "/dev/null";|info = "/var/log/prosody/prosody.log";|g' /etc/prosody/prosody.cfg.lua
-        sed -i 's|error = "/dev/null";|error = "/var/log/prosody/prosody.err";|g' /etc/prosody/prosody.cfg.lua
-        sed -i 's|levels = { "error" }; to = "/dev/null";|levels = { "error" }; to = "syslog";|g' /etc/prosody/prosody.cfg.lua
+        if ! grep -q "/var/log/prosody/prosody.log" /etc/prosody/prosody.cfg.lua; then
+            sed -i 's|info = "/dev/null";|info = "/var/log/prosody/prosody.log";|g' /etc/prosody/prosody.cfg.lua
+            sed -i 's|error = "/dev/null";|error = "/var/log/prosody/prosody.err";|g' /etc/prosody/prosody.cfg.lua
+            sed -i 's|levels = { "error" }; to = "/dev/null";|levels = { "error" }; to = "syslog";|g' /etc/prosody/prosody.cfg.lua
+        fi
     fi
 }
 
 function logging_off_xmpp {
     if [ -d /etc/prosody ]; then
-        sed -i 's|info = "/var/log/prosody/prosody.log";|info = "/dev/null";|g' /etc/prosody/prosody.cfg.lua
-        sed -i 's|error = "/var/log/prosody/prosody.err";|error = "/dev/null";|g' /etc/prosody/prosody.cfg.lua
-        sed -i 's|levels = { "error" }; to = "syslog";|levels = { "error" }; to = "/dev/null";|g' /etc/prosody/prosody.cfg.lua
-        $REMOVE_FILES_COMMAND /var/log/prosody/*
-        rm -rf /var/log/prosody
+        if grep -q "/var/log/prosody/prosody.log" /etc/prosody/prosody.cfg.lua; then
+            sed -i 's|info = "/var/log/prosody/prosody.log";|info = "/dev/null";|g' /etc/prosody/prosody.cfg.lua
+            sed -i 's|error = "/var/log/prosody/prosody.err";|error = "/dev/null";|g' /etc/prosody/prosody.cfg.lua
+            sed -i 's|levels = { "error" }; to = "syslog";|levels = { "error" }; to = "/dev/null";|g' /etc/prosody/prosody.cfg.lua
+            $REMOVE_FILES_COMMAND /var/log/prosody/*
+            rm -rf /var/log/prosody
+        fi
     fi
 }