Implemented `sde update` as a proof of concept of the usage of lib/sde-wrapper-discriminator.in, tree is the default.

bin/sde-update

@@ -3,7 +3,7 @@
 # This copyright note is auto-generated by ./scripts/Create-CopyPatch.
 # 
 # Filename: bin/sde-update
-# Copyright (C) 2007 The OpenSDE Project
+# Copyright (C) 2007 - 2008 The OpenSDE Project
 # 
 # More information can be found in the files COPYING and README.
 # 
@@ -13,11 +13,31 @@
 # GNU General Public License can be found in the file COPYING.
 # --- SDE-COPYRIGHT-NOTE-END ---
 
-#Description: Build stuff
+#Description: Update stuff
+#Alias: up
 
 [ -n "$SDEROOT" ] ||
 	export SDEROOT=$( cd "${0%/*}/.."; pwd -P )
 
-. $SDEROOT/lib/libsde.in
+. "$SDEROOT/lib/libsde.in"
+. "$SDEROOT/lib/sde-wrapper-discriminator.in"
 
-echo_abort 1 "Not yet implemented"
+command='update'
+
+if [ $# -eq 0 ]; then
+	# assuming default
+	discriminator='tree'
+elif [ "$1" == "--help" ]; then
+	sde_wrapper_discriminator_help "$command"
+	exit 1
+else
+	discriminiator=$( sde_wrapper_discriminator "$command" "$1" )
+	if [ -z "$discriminator" ]; then
+		# assuming default
+		discriminator='tree'
+	else
+		shift;
+	fi
+fi
+
+exec "$SDEROOT/bin/sde-$command-$discriminator" "$@"