qubes-installer-qubes-os/anaconda/dracut/anaconda-diskroot

#!/bin/sh
# anaconda-diskroot: find our root image on the given disk device
# usage: anaconda-diskroot DEVICE [PATH]

. /lib/anaconda-lib.sh
command -v getargbool >/dev/null || . /lib/dracut-lib.sh

# Run checkisomd5 on a device
run_checkisomd5() {
    livedev=$1
    if getargbool 0 rd.live.check -d check; then
        [ -b $livedev ] && fs=$(blkid -s TYPE -o value $livedev)
        if [ "$fs" = "iso9660" -o "$fs" = "udf" ]; then
            [ -x /bin/plymouth ] && /bin/plymouth --hide-splash
            if [ -n "$DRACUT_SYSTEMD" ]; then
                p=$(str_replace "$livedev" "-" '\x2d')
                systemctl start checkisomd5@${p}.service
                status=$(systemctl -p ExecMainStatus show checkisomd5@${p}.service)
                splitsep "=" "$status" ignore rc
            else
                checkisomd5 --verbose $livedev
                rc=$?
            fi
            if [ "$rc" == "1" ]; then
                die "CD check failed!"
                exit 1
            fi
            [ -x /bin/plymouth ] && /bin/plymouth --show-splash
        fi
    fi
}

dev="$1"
path="$2" # optional, could be empty

[ -e "/dev/root" ] && exit 1 # we already have a root device!

modprobe -q loop

info "anaconda using disk root at $dev"
mount $dev $repodir || warn "Couldn't mount $dev"
anaconda_live_root_dir $repodir $path
run_checkisomd5 $dev