--- /dev/null
+#! /bin/bash
+
+# replace {release} in a sources.list template with the value of $release
+
+
+# $1 is the class name used
+# $2 is the path to the file copied
+
+# check if a variable of the form {varname} was used at all
+grep -q '{' $2 || exit 0
+
+if [ -z "$release" ]; then
+ echo "\$release is undefined. No substitution performed in $2."
+ exit 0
+fi
+
+sed -i -e "s/{release}/$release/g" $2