Implement Nico's suggestions

Modified behavior of cksum explorer to print nothing if the file doesn't exist
Modified gencode-local to reflect cksum's new behavior
Modified gencode-remote to check states explicitly and error on invalid state.

conf/type/__pf_ruleset/explorer/cksum

@@ -34,8 +34,6 @@ PFCONF="${TMP:-"/etc/pf.conf"}"
 
 if [ -f "${PFCONF}" ]; then	# The pf config file exists, find its cksum.
 	cksum -o 1 ${PFCONF} | cut -d= -f2 | awk '{print $1}'
-else	# the pf config file doesn't exist
-	echo NOTEXIST
 fi
 
 # Debug

conf/type/__pf_ruleset/gencode-local

@@ -59,7 +59,7 @@ case $uname in
       ;;
 esac
 
-if [ ! "${cksum}" = "NOTEXIST" ]; then
+if [ -n "${cksum}" ]; then
    if [ ! "\${currentSum}" = "${cksum}" ]; then
       $__remote_copy "${source}" "$__target_host:${rcvar}.new"
    fi

conf/type/__pf_ruleset/gencode-remote

@@ -28,13 +28,11 @@
 # Remove ${rcvar} in the case of --state absent
 
 state=$(cat "$__object/parameter/state")
-
-if [ ! "$state" = "absent" ]; then   # There is nothing more for a *remote* script to do
-   exit 0
-fi
-
 rcvar=$(cat "$__object/explorer/rcvar")
 
+if [ "$state" = "present" ]; then   # There is nothing more for a *remote* script to do
+   exit 0
+elif [ "$state" = "absent" ]; then
    # --state absent, so ensure that .new doesn't exist and that conf is renamed to .old
    cat <<EOF
    if [ -f "${rcvar}.new" ]; then
@@ -44,4 +42,8 @@ if [ -f "${rcvar}" ]; then
       mv "${rcvar}" "${rcvar}.old"
    fi
 EOF
+else
+   echo "Unknown state ${state}!" >&2
+   exit 1
+fi