diskimage-builder/diskimage_builder/elements/dib-init-system/dib-init-system

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#!/bin/bash
if [ ${DIB_DEBUG_TRACE:-0} -gt 0 ]; then
set -x
fi
set -eu
set -o pipefail
# Debian Jessie and Debian Stretch use /bin/systemctl.
# (/sbin/init is only available if systemd-sysv is installed.)
if [ -f /usr/bin/systemctl -o -f /bin/systemctl ]; then
echo "systemd"
elif [[ -f /sbin/initctl ]]; then
echo "upstart"
elif [[ -f /etc/gentoo-release ]]; then
if [[ -z GENTOO_PROFILE ]]; then
if [[ "${GENTOO_PROFILE}" =~ systemd ]]; then
echo "systemd"
fi
else
echo "openrc"
fi
elif [[ -f /sbin/init ]]; then
if [[ -f /bin/systemd ]]; then
echo "systemd"
else
echo "sysv"
fi
else
echo "Unknown init system"
exit 1
fi