1 files changed, 26 insertions, 5 deletions
diff --git a/pm/pm-functions.in b/pm/pm-functions.in
index 5068781..f4bf755 100644
--- a/pm/pm-functions.in
+++ b/pm/pm-functions.in
@@ -71,19 +71,40 @@ load_hook_blacklist()
 	done
 }
 
+remove_parameter() {
+	local x=""
+	for p in $PM_CMDLINE; do
+		[ "$1" = "$p" ] && {
+			log "Removing parameter $1."
+			continue
+		}
+		x="$x $p"
+		[ "$2" ] && shift
+	done
+	PM_CMDLINE="$x"
+}
+
+add_parameter() {
+	log "Adding parameters $@"
+	PM_CMDLINE="$PM_CMDLINE $@"
+}
+
 load_hook_parameters()
 {
 	[ -f "$PM_UTILS_ETCDIR/parameters" ] || return
-	# loop through the parameters file, and add each line in it to the
-	# end of PM_CMDLINE.
+	# loop through the parameters file, and perform the appropriate
+	# action for each parameter.
+	# Currently, only "add" and "drop" are supported.
 	# Comments begin with hashmarks and run to the end of the line.
 	# Because we are modifying an env var, the while read loop cannot
 	# run in a pipe like the previous one did.
-	while read parameter; do
+	while read action parameter; do
 		parameter="$(echo $parameter |sed 's,#.*$,,g')"
 		[ -z "$parameter" ] && continue
-		log "Adding $parameter to PM_CMDLINE."
-		PM_CMDLINE="${PM_CMDLINE} $parameter"
+		case $action in
+			add) add_parameter $parameter ;;
+			drop) remove_parameter $parameter ;;
+		esac
 	done < "$PM_UTILS_ETCDIR/parameters"
 }