sde-package: Added package_exists() to lib/sde-package.in

lib/sde-package.in

@@ -12,14 +12,24 @@
 # GNU General Public License can be found in the file COPYING.
 # --- SDE-COPYRIGHT-NOTE-END ---
 
-package_autodetect() {
+package_autodetect()
+{
 	pwd -P | sed -n -e "s,^$SDEROOT/package/[^/]*/\([^/]*\)\(/.*\)\?$,\1,p"
 }
 
-package_autodetect_repo() {
+package_autodetect_repo()
+{
 	pwd -P | sed -n -e "s,^$SDEROOT/package/\([^/]*\)\(/.*\)\?,\1,p"
 }
 
-package_confdir() {
+package_exists()
+{
+	local x=$( ls -1 "$SDEROOT/package"/*/"$1/$1.desc" 2> /dev/null )
+
+	[ -s "$x" ]
+}
+
+package_confdir()
+{
 	ls -1d "$SDEROOT/package"/*/"$1" 2> /dev/null | head -n 1
 }