#!/bin/sh
# preinst script for xCAT-server
#
# see: dh_installdeb(1)

set -e

xcat_target_uses_systemd()
{
    if [ -d /run/systemd/system ]; then
        return 0
    fi

    if [ -x /usr/lib/systemd/systemd ] || [ -x /lib/systemd/systemd ]; then
        return 0
    fi

    if [ -L /sbin/init ]; then
        init_target=$(readlink /sbin/init 2>/dev/null || true)
        case "$init_target" in
            *systemd*) return 0 ;;
        esac
    fi

    if [ -r /etc/os-release ]; then
        os_id=
        os_version=
        while IFS='=' read -r key value; do
            value=${value#\"}
            value=${value%\"}
            value=${value#\'}
            value=${value%\'}
            case "$key" in
                ID) os_id=$value ;;
                VERSION_ID) os_version=$value ;;
            esac
        done < /etc/os-release

        if [ "$os_id" = "debian" ] && [ -z "$os_version" ]; then
            return 0
        fi

        os_major=${os_version%%.*}
        case "$os_major" in
            ''|*[!0-9]*) return 1 ;;
        esac
        case "$os_id" in
            ubuntu) [ "$os_major" -ge 15 ] && return 0 ;;
            debian) [ "$os_major" -ge 8 ] && return 0 ;;
        esac
    fi

    return 1
}

if xcat_target_uses_systemd && \
   command -v dpkg-maintscript-helper >/dev/null 2>&1 && \
   dpkg-maintscript-helper supports rm_conffile; then
    dpkg-maintscript-helper rm_conffile /etc/init.d/xcatd -- "$@"
fi

# summary of how this script can be called:
#        * <new-preinst> `install'
#        * <new-preinst> `install' <old-version>
#        * <new-preinst> `upgrade' <old-version>
#        * <old-preinst> `abort-upgrade' <new-version>
# for details, see http://www.debian.org/doc/debian-policy/ or
# the debian-policy package


case "$1" in
    upgrade)
	touch /tmp/xCAT-server_upgrade.tmp
    ;;
    install)
    ;;

    abort-upgrade)
    ;;

    *)
        echo "preinst called with unknown argument \`$1'" >&2
        exit 1
    ;;
esac

# dh_installdeb will replace this with shell code automatically
# generated by other debhelper scripts.

#DEBHELPER#

exit 0