#!/bin/bash
# -*- mode: shell-script; indent-tabs-mode: nil; sh-basic-offset: 4; -*-
# ex: ts=8 sw=4 sts=4 et filetype=sh

dracutfunctions=/usr/lib/dracut/dracut-functions
hostonly=1

check() {
    local _rootdev _usrdev _needed
    # No point trying to support lvm if the binaries are missing
    type -P lvm >/dev/null || return 1

    . $dracutfunctions
    [[ $debug ]] && set -x

    is_lvm() { [[ $(get_fs_type /dev/block/$1) = LVM2_member ]]; }

    [[ $hostonly ]] && {
        _rootdev=$(find_root_block_device)
        if [[ $_rootdev ]]; then
            # root lives on a block device, so we can be more precise about
            # hostonly checking
echo "Checking / via $_rootdev"
            check_block_and_slaves is_lvm "$_rootdev" && _needed=1
        else
            # root is not on a block device, use the shotgun approach
            blkid | grep -q LVM2_member && _needed=1
        fi

        [[ $_needed ]] || {
            _usrdev=$(find_block_device /usr)
            if [[ $_usrdev ]]; then
echo "Checking /usr via $_usrdev"
                check_block_and_slaves is_lvm "$_usrdev" && _needed=1
            fi
        }
    }
echo "_needed=$_needed"
    [[ $_needed ]]
}

check
echo $?