mdevctl.sbin

#!/usr/bin/bash

persist_base=/etc/mdev.d
mdev_base=/sys/bus/mdev/devices
parent_base=/sys/class/mdev_bus

case ${1} in
    start-mdev|stop-mdev|remove-mdev)
        if [ $# -ne 2 ]; then
            echo "Usage: $0 $1 <mdev UUID>" >&2
            exit 1
        fi
        cmd=$1
        uuid=$2
        ;;
    create-mdev)
        if [ $# -ne 4 ]; then
            echo "Usage: $0 $1 <mdev UUID> <parent device> <mdev_type>" >&2
            exit 1
        fi
        cmd=$1
        uuid=$2
        parent=$3
        mdev_type=$4
        ;;
    list-available|list-all|list-mdevs|list-saved)
        if [ $# -ne 1 ]; then
            echo "Usage: $0 $1" >&2
            exit 1
        fi
        cmd=$1
        ;;
esac

case ${cmd} in
    stop-mdev)
        systemctl stop mdev@$uuid.service
        ;;

    start-mdev)
        systemctl start mdev@$uuid.service
        ;;

    create-mdev)
        mkdir -p $persist_base/$parent
        echo $mdev_type > $persist_base/$parent/$uuid
        systemctl start mdev@$uuid.service
        ;;

    remove-mdev)
        systemctl stop mdev@$uuid.service
        find $persist_base -name $uuid -type f | xargs rm -f
        ;;

    list-mdevs)
        for mdev in $(find $mdev_base/ -maxdepth 1 -mindepth 1 -type l); do
            uuid=$(basename $mdev)
            parent_type=$(readlink -f $mdev/mdev_type)
            mdev_type=$(basename $parent_type)
            parent=$(basename $(echo $parent_type | sed -e 's/\/mdev_supported_types.*//'))
            echo "$uuid $parent $mdev_type"
        done
        ;;
    list-saved)
        for parent in $(find $persist_base/ -maxdepth 1 -mindepth 1 -type d); do
            for mdev in $(find $parent/ -maxdepth 1 -mindepth 1 -type f); do
                uuid=$(basename $mdev)
                mdev_type=$(cat $mdev)
                parent=$(basename $parent)
                echo "$uuid $parent $mdev_type"
            done
        done
        ;;

    list-available|list-all)
        if [ $cmd == "list-available" ]; then
            exclude_nonavail="yes"
        fi

        for parent in $(find $parent_base/ -maxdepth 1 -mindepth 1 -type l); do
            echo "$(basename $parent)"
            for parent_type in $(find $parent/mdev_supported_types/ -maxdepth 1 -mindepth 1 -type d); do
                avail=$(cat $parent_type/available_instances)
                if [ $avail -eq 0 ] && [ "$exclude_nonavail" == "yes" ]; then
                    continue
                fi
                echo "  $(basename $parent_type)"
                echo "    Available instances: $avail"
                echo "    Device API: $(cat $parent_type/device_api)"
                if [ -e $parent_type/description ]; then
                    echo "    Description: $(cat $parent_type/description | tr '\n' ' ')"
                fi
            done
        done
        ;;
esac