diff --git a/hooks/common.sh b/hooks/common.sh
index c406a54..e431241 100644
--- a/hooks/common.sh
+++ b/hooks/common.sh
@@ -78,6 +78,38 @@ function installDebianPackage
 
 
 
+#
+#  Remove a Debian package.
+#
+function removeDebianPackage
+{
+    prefix=$1
+    package=$2
+
+    #
+    # Log our options
+    #
+    logMessage "Purging Debian package ${package} from prefix ${prefix}"
+
+    #
+    #  We require a package + prefix
+    #
+    assert $LINENO "${package}"
+    assert $LINENO "${prefix}"
+
+    #
+    # Prefix must be a directory.
+    #
+    assert $LINENO -d ${prefix}
+
+    #
+    # Purge the package
+    #
+    chroot ${prefix} /usr/bin/dpkg --purge ${package}
+
+}
+
+
 #
 #  Install a CentOS4 package via yum
 #
diff --git a/roles/builder b/roles/builder
index 149f1aa..efbe277 100755
--- a/roles/builder
+++ b/roles/builder
@@ -13,16 +13,14 @@ prefix=$1
 
 
 #
-#  This function installs a single package into the chroot, forcing
-# the installation to be non-interactive.
+#  Source our common functions - this will let us install a Debian package.
 #
-function install_package
-{
-    package=$1
-    
-    DEBIAN_FRONTEND=noninteractive chroot ${prefix} /usr/bin/apt-get --yes --force-yes install $package
+if [ -e /usr/lib/xen-tools/common.sh ]; then
+    . /usr/lib/xen-tools/common.sh
+else
+    echo "Installation problem"
+fi
 
-}
 
 
 
@@ -32,13 +30,14 @@ function install_package
 #
 chroot ${prefix} /usr/bin/apt-get update
 
+
 #
 #  Install the packages
 #
-install_package dpkg-dev
-install_package devscripts
-install_package fakeroot
-install_package debhelper
-install_package build-essential
-install_package lintian
-install_package linda
+installDebianPackage ${prefix} dpkg-dev
+installDebianPackage ${prefix} devscripts
+installDebianPackage ${prefix} fakeroot
+installDebianPackage ${prefix} debhelper
+installDebianPackage ${prefix} build-essential
+installDebianPackage ${prefix} lintian
+installDebianPackage ${prefix} linda
diff --git a/roles/gdm b/roles/gdm
index c9f3621..118b4bb 100755
--- a/roles/gdm
+++ b/roles/gdm
@@ -11,17 +11,15 @@
 prefix=$1
 
 
-#
-#  This function installs a single package into the chroot, forcing
-# the installation to be non-interactive.
-#
-function install_package
-{
-    package=$1
-    
-    DEBIAN_FRONTEND=noninteractive chroot ${prefix} /usr/bin/apt-get --yes --force-yes install $package
 
-}
+#
+#  Source our common functions - this will let us install a Debian package.
+#
+if [ -e /usr/lib/xen-tools/common.sh ]; then
+    . /usr/lib/xen-tools/common.sh
+else
+    echo "Installation problem"
+fi
 
 
 
@@ -35,14 +33,14 @@ chroot ${prefix} /usr/bin/apt-get update
 #
 #  Install the packages
 #
-install_package xserver-xfree86
-install_package vncserver
-install_package xfonts-100dpi
-install_package xfonts-75dpi
-install_package xfonts-base
-install_package rxvt
-install_package gdm
-install_package icewm-experimental
+installDebianPackage ${prefix} xserver-xfree86
+installDebianPackage ${prefix} vncserver
+installDebianPackage ${prefix} xfonts-100dpi
+installDebianPackage ${prefix} xfonts-75dpi
+installDebianPackage ${prefix} xfonts-base
+installDebianPackage ${prefix} rxvt
+installDebianPackage ${prefix} gdm
+installDebianPackage ${prefix} icewm-experimental
 
 #
 #  Add a new section to the GDM configuration file.
diff --git a/roles/minimal b/roles/minimal
index 2d775a9..9f331d2 100755
--- a/roles/minimal
+++ b/roles/minimal
@@ -14,38 +14,26 @@ prefix=$1
 
 
 #
-#  This function installs a single package into the chroot, forcing
-# the installation to be non-interactive.
+#  Source our common functions - this will let us install a Debian package.
 #
-function install_package
-{
-    package=$1
-    
-    DEBIAN_FRONTEND=noninteractive chroot ${prefix} /usr/bin/apt-get --yes --force-yes install $package
-
-}
+if [ -e /usr/lib/xen-tools/common.sh ]; then
+    . /usr/lib/xen-tools/common.sh
+else
+    echo "Installation problem"
+fi
 
 
-#
-#  This function removes the given package.
-#
-function remove_package
-{
-    package=$1
-
-    chroot ${prefix} /usr/bin/dpkg --purge ${package}
-}
 
 
 #
 #  Install some new packages - do this first to avoid dependency errors.
 #
-install_package syslog-ng 
-install_package deborphan
-install_package less
-install_package screen
-install_package sudo
-install_package vim
+installDebianPackage ${prefix} syslog-ng 
+installDebianPackage ${prefix} deborphan
+installDebianPackage ${prefix} less
+installDebianPackage ${prefix} screen
+installDebianPackage ${prefix} sudo
+installDebianPackage ${prefix} vim
 
 
 #
@@ -53,28 +41,28 @@ install_package vim
 #
 
 # PPP stuff.
-remove_package pppconfig
-remove_package pppoeconf
-remove_package pppoe
-remove_package ppp
-remove_package libpcap0.7
+removeDebianPackage ${prefix} pppconfig
+removeDebianPackage ${prefix} pppoeconf
+removeDebianPackage ${prefix} pppoe
+removeDebianPackage ${prefix} ppp
+removeDebianPackage ${prefix} libpcap0.7
 
 # Editors
-remove_package nano
-remove_package ed
-remove_package nvi
+removeDebianPackage ${prefix} nano
+removeDebianPackage ${prefix} ed
+removeDebianPackage ${prefix} nvi
 
 # Syslog
-remove_package klogd
-remove_package sysklogd
+removeDebianPackage ${prefix} klogd
+removeDebianPackage ${prefix} sysklogd
 
 # manpages
-remove_package manpages  
-remove_package man-db 
-remove_package info
+removeDebianPackage ${prefix} manpages  
+removeDebianPackage ${prefix} man-db 
+removeDebianPackage ${prefix} info
 
 # misc
-remove_package tasksel
-remove_package pciutils
-remove_package fdutils
-remove_package cpio
+removeDebianPackage ${prefix} tasksel
+removeDebianPackage ${prefix} pciutils
+removeDebianPackage ${prefix} fdutils
+removeDebianPackage ${prefix} cpio
diff --git a/roles/xdm b/roles/xdm
index 4458842..f51bf72 100755
--- a/roles/xdm
+++ b/roles/xdm
@@ -13,16 +13,13 @@ prefix=$1
 
 
 #
-#  This function installs a single package into the chroot, forcing
-# the installation to be non-interactive.
+#  Source our common functions - this will let us install a Debian package.
 #
-function install_package
-{
-    package=$1
-    
-    DEBIAN_FRONTEND=noninteractive chroot ${prefix} /usr/bin/apt-get --yes --force-yes install $package
-
-}
+if [ -e /usr/lib/xen-tools/common.sh ]; then
+    . /usr/lib/xen-tools/common.sh
+else
+    echo "Installation problem"
+fi
 
 
 
@@ -35,14 +32,14 @@ chroot ${prefix} /usr/bin/apt-get update
 #
 #  Install the packages
 #
-install_package xserver-xfree86
-install_package vncserver
-install_package xfonts-100dpi
-install_package xfonts-75dpi
-install_package xfonts-base
-install_package rxvt
-install_package xdm
-install_package icewm-experimental
+installDebianPackage ${prefix} xserver-xfree86
+installDebianPackage ${prefix} vncserver
+installDebianPackage ${prefix} xfonts-100dpi
+installDebianPackage ${prefix} xfonts-75dpi
+installDebianPackage ${prefix} xfonts-base
+installDebianPackage ${prefix} rxvt
+installDebianPackage ${prefix} xdm
+installDebianPackage ${prefix} icewm-experimental
 
 
 #