diskimage-builder/elements/base/pre-install.d/03-baseline-tools

#!/bin/bash
# Install baseline packages and tools.

set -eu
set -o pipefail

# If lsb_release is missing, just do nothing.
DISTRO=`lsb_release -si` || true

case $DISTRO in
    'Ubuntu'|'Debian')
        # Note: add-apt-repository would be nice for RPM platforms too - so when we
        # need something like it, create a wrapper in dpkg/bin and fedora/bin.
        apt-get -y update
        install-packages python-software-properties
        ;;
esac