#!/bin/bash

# Copyright 2015 The Kubernetes Authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

# Based on this excellent blog post by Ivan - http://blog.e0ne.info/post/Attach-Cinder-Volume-to-the-Ironic-Instance-without-Nova.aspx

export OS_PROJECT_DOMAIN_ID=default
export OS_USER_DOMAIN_ID=default
export OS_PROJECT_NAME=admin
export OS_PASSWORD=secret
export OS_AUTH_URL=http://10.0.0.2/identity
export OS_USERNAME=admin
export PATH=$PATH:/lib/udev

# Notes:
#  - Please install "jq" package before using this driver.
usage() {
    err "Invalid usage. Usage: "
    err "\t$0 init"
    err "\t$0 attach <json params> <nodename>"
    err "\t$0 detach <mount device> <nodename>"
    err "\t$0 waitforattach <mount device> <json params>"
    err "\t$0 mountdevice <mount dir> <mount device> <json params>"
    err "\t$0 unmountdevice <mount dir>"
    err "\t$0 getvolumename <json params>"
    err "\t$0 isattached <json params> <nodename>"
    exit 1
}

err() {
    echo -ne $* 1>&2
}

log() {
    echo -ne $* >&1
}

ismounted() {
    MOUNT=`findmnt -n ${MNTPATH} 2>/dev/null | cut -d' ' -f1`
    if [ "${MOUNT}" == "${MNTPATH}" ]; then
        echo "1"
    else
        echo "0"
    fi
}

getdevice() {
    VOLUMEID=$(echo ${JSON_PARAMS} | jq -r '.volumeID')
    DMDEV="/dev/disk/by-path/$(ls -1 /dev/disk/by-path/ | grep $VOLUMEID)"
    echo ${DMDEV}
}

attach() {
    JSON_PARAMS=$1
    SIZE=$(echo $1 | jq -r '.size')

    VOLUMEID=$(echo ${JSON_PARAMS} | jq -r '.volumeID')
    sudo -E PATH=$PATH cinder local-attach $VOLUMEID >> /tmp/cinder2.log 2>&1

    DMDEV=$(getdevice)
    if [ ! -b "${DMDEV}" ]; then
        err "{\"status\": \"Failure\", \"message\": \"Volume ${VOLUMEID} does not exist\"}"
        exit 1
    fi
    log "{\"status\": \"Success\", \"device\":\"${DMDEV}\"}"
    exit 0
}

detach() {
    log "{\"status\": \"Success\"}"
    exit 0
}

waitforattach() {
    #shift
    #attach $*
    log "{\"status\": \"Success\"}"
    exit 0

}

domountdevice() {
    MNTPATH=$1
    JSON_PARAMS=$2
    DMDEV=$(getdevice)
    FSTYPE=$(echo $JSON_PARAMS|jq -r '.["kubernetes.io/fsType"]')

    if [ ! -b "${DMDEV}" ]; then
        err "{\"status\": \"Failure\", \"message\": \"${DMDEV} does not exist\"}"
        exit 1
    fi

    if [ $(ismounted) -eq 1 ] ; then
        log "{\"status\": \"Success\"}"
        exit 0
    fi

    VOLFSTYPE=`blkid -o udev ${DMDEV} 2>/dev/null|grep "ID_FS_TYPE"|cut -d"=" -f2`
    if [ "${VOLFSTYPE}" == "" ]; then
        mkfs -t ${FSTYPE} ${DMDEV} >/dev/null 2>&1
        if [ $? -ne 0 ]; then
            err "{ \"status\": \"Failure\", \"message\": \"Failed to create fs ${FSTYPE} on device ${DMDEV}\"}"
            exit 1
        fi
    fi

    mkdir -p ${MNTPATH} &> /dev/null

    mount ${DMDEV} ${MNTPATH} &> /dev/null
    if [ $? -ne 0 ]; then
        err "{ \"status\": \"Failure\", \"message\": \"Failed to mount device ${DMDEV} at ${MNTPATH}\"}"
        exit 1
    fi
    log "{\"status\": \"Success\"}"
    exit 0
}

unmountdevice() {
    MNTPATH=$1
    if [ ! -d ${MNTPATH} ]; then
        log "{\"status\": \"Success\"}"
        exit 0
    fi

    if [ $(ismounted) -eq 0 ] ; then
        log "{\"status\": \"Success\"}"
        exit 0
    fi

    umount ${MNTPATH} &> /dev/null
    if [ $? -ne 0 ]; then
        err "{ \"status\": \"Failed\", \"message\": \"Failed to unmount volume at ${MNTPATH}\"}"
        exit 1
    fi

    $VOLUMEID=$(echo ${MNTPATH} | sed -r "s/^.*volume-(.*)-lun.*/\1/")
    sudo -E PATH=$PATH cinder local-detach $VOLUMEID >> /tmp/cinder2.log 2>&1

    log "{\"status\": \"Success\"}"
    exit 0
}

getvolumename() {
    JSON_PARAMS=$1
    UUID=$(echo ${JSON_PARAMS} | jq -r '.volumeID')

    log "{\"status\": \"Success\", \"volumeName\":\"${UUID}\"}"
    exit 0
}

isattached() {
    log "{\"status\": \"Success\", \"attached\":true}"
    exit 0
}

op=$1

if [ "$op" = "init" ]; then
    log "{\"status\": \"Success\"}"
    exit 0
fi

if [ $# -lt 2 ]; then
    usage
fi

shift

case "$op" in
    attach)
        attach $*
        ;;
    detach)
        detach $*
        ;;
    waitforattach)
        waitforattach $*
        ;;
    mountdevice)
        domountdevice $*
        ;;
    unmountdevice)
        unmountdevice $*
        ;;
    getvolumename)
        getvolumename $*
        ;;
    isattached)
        isattached $*
        ;;
    *)
        err "{ \"status\": \"Not supported\" }"
        exit 1
esac

exit 1