volume_mounter

#!/bin/bash

set -e

CIFS=${CIFS://192.168.121.126/kubvolumes}
CIFSUSER=${CIFSUSER:nobody}
CIFSPASS=${CIFSPASS:nobody}

ACTION=$1
VOLUME=$2
TARGET=$3


if [ -z "${ACTION}" ] || [ -z "$TARGET" ]; then
	echo "usage: $0 mount|unmount volume target" >&2
	exit 1
fi


if [ -z "${VOLUME}" ]; then
	DEV=$(mount | grep ${TARGET} | cut -d" " -f 1)
	VOLUMEPATH=$(losetup ${DEV} | sed -e 's/.*(\(.*\))/\1/')
	VOLUME=$(basename ${VOLUMEPATH})
fi

SERVERMNT=/tmp/mnt/server/${VOLUME}
mkdir -p ${SERVERMNT}

function is_server_mounted() {
	mount | grep -q ${CIFS}
	return $?
}



function is_volume_mounted() {
	mount | grep -q ${TARGET}
	return $?
}



function mount_server() {
	set -e 
	mount -t cifs -o username=${CIFSUSER},password=${CIFSPASS},fscontext=system_u:object_r:svirt_sandbox_file_t:s0 ${CIFS} ${SERVERMNT}
}

function unmount_server() {
	set -e
	umount -f ${SERVERMNT}
	rmdir ${SERVERMNT}
}

function create_vol() {
	set -e
	VOL=$1
	dd if=/dev/zero of=${VOL} bs=1M count=1024
	yes | mkfs.ext4 ${VOL}
}



function get_loop_dev_for_vol() {
	VOL=$1
	DEV=$(losetup -j ${VOL} | cut -d: -f 1)
	test -e ${VOL} || create_vol ${VOL}

	if [ -z "${DEV}" ]; then
		losetup -f ${VOL}
		DEV=$(losetup -j ${VOL} | cut -d: -f 1)
	fi
	echo ${DEV}
	
	echo dev: ${DEV} >> /tmp/out

	if [ -z "${DEV}" ]; then
		return 1
	else
		return 0
	fi
}

function mount_volume() {
	set -e

	if is_volume_mounted; then
		true
	else
		VOLUMEPATH=${SERVERMNT}/${VOLUME}

		DEV=$(get_loop_dev_for_vol ${VOLUMEPATH})

		mount -o fscontext=system_u:object_r:svirt_sandbox_file_t:s0 ${DEV} ${TARGET}
	fi
}

function unmount_volume() {
	set -e

	echo umount target: ${TARGET}

	DEV=$(mount | grep ${TARGET} | cut -d" " -f 1)

	echo umount dev: ${DEV}

	if is_volume_mounted; then
		umount ${TARGET}
		losetup -d ${DEV}
		unmount_server
	else
		true
	fi

}


case ${ACTION} in
	mount)
		if is_server_mounted;  then
			true
		else
			mount_server
		fi
		mount_volume
		;;
	unmount)
		unmount_volume
		;;
	*)
		echo unknown action >&2
		exit 1
esac

echo .