xcat-core/xCAT-server/share/xcat/scripts/xcatd-init-compat-functions

xcat_systemd_os_release_status()
{
    os_release="${1-}/etc/os-release"
    [ -r "$os_release" ] || return 2

    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=$value ;;
        esac
    done < "$os_release"

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

    os_major=${os_version%%.*}
    case "$os_major" in
        ''|*[!0-9]*) return 2 ;;
    esac

    case "$os_id" in
        rhel|centos|rocky|almalinux|ol|scientific)
            [ "$os_major" -ge 7 ] && return 0
            return 1
            ;;
        fedora|ubuntu)
            [ "$os_major" -ge 15 ] && return 0
            return 1
            ;;
        debian)
            [ "$os_major" -ge 8 ] && return 0
            return 1
            ;;
        sles|sled|opensuse|opensuse-leap|opensuse-tumbleweed)
            [ "$os_major" -ge 12 ] && return 0
            return 1
            ;;
        *)
            return 2
            ;;
    esac

}

xcat_target_uses_systemd()
{
    if [ -d /run/systemd/system ]; 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 ;;
            *) return 1 ;;
        esac
    fi

    if [ -e /sbin/init ]; then
        return 1
    fi

    if xcat_systemd_os_release_status; then
        return 0
    else
        os_release_status=$?
        if [ "$os_release_status" -eq 1 ]; then
            return 1
        fi
    fi

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

    return 1
}

clear_xcatd_pending_state()
{
    rm -f "$xcatd_state_dir/pending-xcatd" \
        "$xcatd_state_dir/pending-deleted" \
        "$xcatd_state_dir/pending-enabled" \
        "$xcatd_state_dir/pending-xcatd.tmp."*
}