+#!/bin/sh
+set -e
+. ./misc.sh
+
+expect_n_args 2 "(hostname, FQDN)" "$@"
+hostname="$1"
+fqdn="$2"
+shift 2
+
+cd "${setup_scripts_dir}"
+
+# Adapt /etc/ to our needs by copying from ./etc_files. This will set
+# basic configurations affecting following steps, such as setup of APT
+# and the locale selection, so needs to be right at the beginning.
+./copy_dirtree.sh "${config_tree_prefix}/etc_files" "" all "$@"
+
+# Set hostname and FQDN.
+./set_hostname_and_fqdn.sh "${hostname}" "${fqdn}"
+
+# Ensure package installation state as defined by what packages are
+# defined as required by Debian policy and by settings in ./apt-mark/.
+apt update
+./install_for_target.sh all "$@"
+./purge_nonrequireds.sh all "$@"
+
+# Ensure our desired locale is available.
+locale-gen
+
+# Only upgrade after reducing the system to the desired minimum, so that
+# we don't need to get more data than necessary.
+apt -y dist-upgrade
+
+# Set Berlin localtime.
+ln -sf /usr/share/zoneinfo/Europe/Berlin /etc/localtime