correct debian postinst error

debian/postinst

@@ -3,22 +3,25 @@ set -e
 
 case "$1" in
     configure)
-        [ -e /media ] || mkdir /media
+        if [ ! -e /media ]; then
+            mkdir /media
+        fi
 
-    # confine udevil execution to plugdev group members?
-    if (( 0 )); then
-        for prog in /usr/bin/udevil; do
-            if ! dpkg-statoverride --list $prog > /dev/null; then
-                    if ! getent group plugdev > /dev/null; then
-                        addgroup --quiet --system plugdev || true
-                    fi
-                    chown root:plugdev $prog
-                    chmod 4754 $prog
-            fi
-        done
-    else
-        chmod 4755 /usr/bin/udevil
-    fi
+        # confine udevil execution to plugdev group members?
+        UDEVIL_USE_PLUGDEV=0
+        if [ $UDEVIL_USE_PLUGDEV -ne 0 ]; then
+            for prog in /usr/bin/udevil; do
+                if ! dpkg-statoverride --list $prog > /dev/null; then
+                        if ! getent group plugdev > /dev/null; then
+                            addgroup --quiet --system plugdev || true
+                        fi
+                        chown root:plugdev $prog
+                        chmod 4754 $prog
+                fi
+            done
+        else
+            chmod 4755 /usr/bin/udevil
+        fi
         ;;
 
     abort-upgrade|abort-remove|abort-deconfigure)
@@ -30,6 +33,9 @@ case "$1" in
         ;;
 esac
 
+# dh_installdeb will replace this with shell code automatically
+# generated by other debhelper scripts.
+
 #DEBHELPER#
 
 exit 0

debian/postrm

@@ -1,6 +1,15 @@
 #! /bin/sh
 set -e
 
-if [ "$1" == "purge" ]; then
-    rm -rf /etc/udevil
-fi
+case "$1" in
+    purge)
+        rm -rf /etc/udevil
+    ;;
+esac
+
+# dh_installdeb will replace this with shell code automatically
+# generated by other debhelper scripts.
+
+#DEBHELPER#
+
+exit 0