update: safe leaf_update_package_datebase

leaf

@@ -548,18 +548,25 @@ leaf_conffile_is_unmodified() {
 }
 
 leaf_update_package_database() {
-  local _item="$(echo "$2" | awk 'BEGIN{FS="/";OFS="\\/"}{print $1,$2}')"
-  case $1 in
+  local action=$1 atom=$2 db="${INSTALLED_PACKAGES}"
+  local tmp="${db}.tmp.$$"
+
+  case "$action" in
     add)
-      sed -i "/${_item}/d" "${INSTALLED_PACKAGES}"
-      echo "$2" >> ${INSTALLED_PACKAGES}
+      { [ -f "$db" ] && grep -Fvx -- "$atom" "$db" || :; printf '%s\n' "$atom"; } >"$tmp" &&
+      mv -f -- "$tmp" "$db"
       ;;
     delete)
-      sed -i "/${_item}/d" "${INSTALLED_PACKAGES}"
+      grep -Fvx -- "$atom" "$db" >"$tmp" &&
+      mv -f -- "$tmp" "$db"
+      ;;
+    *)
+      leaf_error "unknown operation leaf_update_package_database ${action}."
       ;;
   esac
 }
 
+
 leaf_update_environment() {
   ldconfig
   [ ! -r /etc/profile ] || source /etc/profile