+[ -r /proc/1 ] || mount -t proc none /proc
+
+if [ -n "$CHROOTMIRROR" ] ; then
+ echo "$CHROOTMIRROR" > /etc/apt/sources.list
+fi
+
+# install additional packages
+if [ "$PACKAGES" = 'yes' ] ; then
+ if ! [ -r /etc/debootstrap/packages ] ; then
+ echo "Error: /etc/debootstrap/packages not found, exiting."
+ exit 1
+ else
+ apt-get update
+ apt-get -y install $(cat /etc/debootstrap/packages)
+ fi
+fi