Mini Shell

#!/usr/bin/bash

# called by dracut
check() {
    return 255
}

# called by dracut
depends() {
    return 0
}

# called by dracut
installkernel() {
    # Include wired net drivers, excluding wireless
    local _arch=${DRACUT_ARCH:-$(uname -m)}
    local _net_symbols='eth_type_trans|register_virtio_device|usbnet_open'
    local _unwanted_drivers='/(wireless|isdn|uwb|net/ethernet|net/phy|net/team)/'
    local _net_drivers

    if [[ $_arch == "s390" ]] || [[ $_arch == "s390x" ]]; then
        dracut_instmods -o -P ".*${_unwanted_drivers}.*" -s "$_net_symbols" "=drivers/s390/net"
    fi

    if [[ $hostonly_mode == 'strict' ]] && [[ -n ${hostonly_nics+x} ]]; then
        for _nic in $hostonly_nics; do
            mapfile -t _net_drivers < <(get_dev_module /sys/class/net/"$_nic")
            if ((${#_net_drivers[@]} == 0)); then
                derror "--hostonly-nics contains invalid NIC '$_nic'"
                continue
            fi
            hostonly="" instmods "${_net_drivers[@]}"
        done
        return 0
    fi

    dracut_instmods -o -P ".*${_unwanted_drivers}.*" -s "$_net_symbols" "=drivers/net"
    #instmods() will take care of hostonly
    instmods \
        '=drivers/net/mdio' \
        '=drivers/net/phy' \
        '=drivers/net/team' \
        '=drivers/net/ethernet' \
        ecb arc4 bridge stp llc ipv6 bonding 8021q ipvlan macvlan af_packet virtio_net xennet
}

# called by dracut
install() {
    return 0
}