fast-vm-image

#!/bin/sh
DEBUG_LOG_CMD="logger -p debug -t fast-vm-image-dbg"
FASTVM_HELPER=/usr/libexec/fast-vm-helper.sh
FASTVM_USER_CONF_DIR="$HOME/.fast-vm"
FASTVM_SYSTEM_CONF_DIR="/etc/fast-vm"
CURL_OPTS=""
LOG_LEVEL=7
DISPLAY_LEVEL=7
FVM=$(basename "$0")

## terminal colors
c_red=$(tput setaf 1)
c_yellow=$(tput setaf 3)
c_green=$(tput setaf 2)
c_cyan=$(tput setaf 6)
c_normal=$(tput sgr0)

## LOG priorities
P_DEBUG=7
P_INFO=6
P_WARNING=4
P_ERROR=3

#### start common functions
# function for message output to display&logs based on LOG/DISPLAY level
pmsg () {
	priority="$1"
	message="$2"
	vmn=${3:-__}
	if [ "$LOG_LEVEL" -ge "$priority" ]; then
		printf "%s |%s| %s" "$USER" "$vmn" "$message"|logger -p "$priority" --id -t fast-vm
	fi
	if [ "$DISPLAY_LEVEL" -ge "$priority" ]; then
		case "$priority" in
			"$P_DEBUG")
				# shellcheck disable=SC2059
				printf "[${c_cyan}inf${c_normal}] %b" "$message" | sed -e "s/^/\[$vmn\]/"
				;;
			"$P_INFO")
				# shellcheck disable=SC2059
				printf "[${c_green}ok${c_normal}] %b" "$message" | sed -e "s/^/\[$vmn\]/"
				;;
			"$P_WARNING")
				# shellcheck disable=SC2059
				printf "[${c_yellow}wrn${c_normal}] %b" "$message" | sed -e "s/^/\[$vmn\]/"
				;;
			"$P_ERROR")
				# shellcheck disable=SC2059
				printf "[${c_red}err${c_normal}] %b" "$message" | sed -e "s/^/\[$vmn\]/"
				;;
			*)
				printf "[unk] %s" "$message" | sed -e "s/^/\[$vmn\]/"
				;;
		esac
	fi
}
# helper function for loading and checking configuration
check_empty () {
	var_name="$1"
	var_value="$2"
	if [ -z "$var_value" ]; then
                pmsg $P_ERROR "variable $var_name not declared in global configuration run configure-fast-vm again or fix manually\n"
		exit 2
	fi
}

check_file () {
	file_path="$1"
	file_size=0
	file_local=0
	error_prefix="$2"
	quiet_flag="$3"
	if [ -z "$file_path" ]; then pmsg $P_DEBUG "provided empty file path\n"; fi
	if [ "$curl_ok" -eq 0 ] && [ "$(echo "$file_path" | awk  '{ s=substr($0, 0, 4); print s; }' )"  = "http" ]; then
		curl_data=$(curl $CURL_OPTS --head "$file_path" 2>/dev/null)
		curl_exit="$?"
		curl_httpok=$(echo "$curl_data"|grep -c -E "(HTTP.*200 OK|HTTP/2 200)")
		if [ "$curl_httpok" -eq "1" ]; then
			file_size=$(echo "$curl_data"|grep -i "Content-Length:"|awk '{print $2}'|sed 's/[^0-9]*//g')
			if [ -z "$file_size" ]; then
				file_size=0
				pmsg $P_DEBUG "Unable to detect remote file. Using '$file_size' instead.\n"
			else
				pmsg $P_DEBUG "Detected remote file with size '$file_size'.\n"
			fi
		else
			if [ -z "$quiet_flag" ]; then
				# print error only when "quiet" flag is not present
				pmsg $P_ERROR "$error_prefix: error checking remote file on the server.\nCURL exited with code $curl_exit and we got following information from server\n$curl_data\n"
			fi
			return 2
		fi
	else
		if [ -f "$file_path" ]; then
			file_local=1
		else
			pmsg $P_ERROR "$error_prefix: local file '$file_path' not found\n"
			return 2
		fi
	fi
}

download_file () {
	file_url="$1"
	tmp_file=$(mktemp)
	pmsg $P_DEBUG "downloading $file_url\ninto $tmp_file\n" >&2
	if curl $CURL_OPTS -o "$tmp_file" -s "$file_url"; then
		echo "$tmp_file"
	else
		pmsg $P_ERROR "Download failed\n" >&2
		exit 1
	fi
}

config_file_operation () {
	cmd="$1"
	options="$2"

	if [ "$(whoami)" = 'root' ]; then
		$cmd "$FASTVM_SYSTEM_CONF_DIR/$options" 2>&1|$DEBUG_LOG_CMD
	else
		$cmd "$FASTVM_USER_CONF_DIR/$options" 2>&1|$DEBUG_LOG_CMD
	fi
}

check_image_existance () {
	if [ ! -b "/dev/$THINPOOL_VG/$VM_PREFIX$image_name" ]; then
		pmsg $P_ERROR "Image '${image_name}' not found.\n '/dev/$THINPOOL_VG/$VM_PREFIX$image_name' is not a block device.\n"
		exit 2
	fi
}

usage () {
	part="$1"

	case $part in
		import)
			echo "$FVM import ImageName <empty |PathToImage> PathToLibvirtXML [PathToHacksFile] [PathToDeleteHackFile]"
			;;
		import_custom)
			echo "$FVM import_custom ImageSizeInGiB ImageName <empty |PathToImage> PathToLibvirtXML [PathToHacksFile] [PathToDeleteHackFile]"
			;;
		export)
			echo "$FVM export ImageName [ <zst|xz|gz> ]"
			;;
		remove)
			echo "$FVM remove ImageName"
			;;
		resize)
			echo "$FVM resize ImageName NewImageSizeInGiB"
			;;
		import_profile)
			echo "$FVM import_profile ProfileName ImageName PathToLibvirtXML [PathToHacksFile] [PathToDeleteHackFile]"
			;;
		remove_profile)
			echo "$FVM remove_profile ProfileName"
			;;
		list)
			echo "$FVM list [short]"
			;;
		list_profiles)
			echo "$FVM list_profiles [short]"
			;;
		compact)
			echo "$FVM compact ImageName"
			;;
		verify)
			echo "$FVM verify ImageName [ PathToCheksumsDir ]"
			;;
		gen_checksums)
			echo "$FVM gen_checksums ImageName"
			;;
		*)
			echo "== fast-vm-image version 1.7 <ondrej-xa2iel8u@famera.cz> =="
			echo "$FVM <action> <options>"
			for cmd in import import_custom export remove resize import_profile remove_profile list list_profiles compact verify gen_checksums;
			do
				usage $cmd noexit
			done
			;;
	esac
	# exit only when second parameter is not specified, otherwise just return and continue
	if [ -z "$2" ]; then exit 1; fi
}

#### end common functions

# first parameter is compulsory
if [ -z "$1" ]; then usage; fi

# locate and load fast-vm configuration
if [ -f "/etc/fast-vm.conf" ]; then
	# load and verify configuration
	# shellcheck source=fast-vm.conf.defaults
	. /etc/fast-vm.conf

	check_empty "VM_PREFIX" "$VM_PREFIX"
	check_empty "LIBVIRT_NETWORK" "$LIBVIRT_NETWORK"
	check_empty "THINPOOL_VG" "$THINPOOL_VG"
	check_empty "THINPOOL_LV" "$THINPOOL_LV"
	check_empty "SUBNET_NUMBER" "$SUBNET_NUMBER"
	check_empty "FASTVM_GROUP" "$FASTVM_GROUP"
else
	pmsg $P_ERROR "no global configuration file /etc/fast-vm.conf not found please run configure-fast-vm as root before using fast-vm\n"
	exit 1
fi

# check if we are in $FASTVM_GROUP group or if we are root
if [ "$(id |grep -c "($FASTVM_GROUP)")" -eq 0 ] && [ "$(whoami)" != "root" ]; then
	pmsg $P_ERROR "User running fast-vm must be member of group '$FASTVM_GROUP'. You can easily add user to this group using command below\n # usermod -a -G $FASTVM_GROUP $(whoami)\n"
	exit 1
fi

## try to detect if the defined thin pool is available
double_dash_lv=$(echo "$THINPOOL_LV"|sed 's/-/--/g') # LVM uses double dash in the /dev/mapper
double_dash_vg=$(echo "$THINPOOL_VG"|sed 's/-/--/g') # also for VGs
if [ -b "/dev/mapper/${double_dash_vg}-${double_dash_lv}-tpool" ];then
	THINPOOL_PATH="/dev/mapper/${double_dash_vg}-${double_dash_lv}-tpool"
fi
if [ -b "/dev/mapper/${double_dash_vg}-${double_dash_lv}_tdata" ] && [ -b "/dev/mapper/${double_dash_vg}-${double_dash_lv}_tmeta" ];then
	THINPOOL_PATH="/dev/mapper/${double_dash_vg}-${double_dash_lv}"
fi
if [ -z "$THINPOOL_PATH" ]; then
	pmsg $P_ERROR "thinpool $THINPOOL_VG/$THINPOOL_LV not found or not a thinpool LV, try running configure-fast-vm as root to check/correct\n"
	exit 1
fi

# create local configuration directory if it doesn't exists
if [ ! -d "$FASTVM_USER_CONF_DIR" ]; then
	mkdir "$FASTVM_USER_CONF_DIR" 2>&1 |$DEBUG_LOG_CMD
fi
if [ ! -d "$FASTVM_SYSTEM_CONF_DIR" ] && [ "$(whoami)" = "root" ]; then
	mkdir "$FASTVM_SYSTEM_CONF_DIR" 2>&1 |$DEBUG_LOG_CMD
fi

## check if there is curl available so we can fetch images from http/https
command -v curl >/dev/null 2>&1
curl_ok="$?"
command -v pv >/dev/null 2>&1
pv_ok="$?"

#### main script
case "$1" in
	import|import_custom)
		unpacked_image_size="10"
		if [ "$1" = "import_custom" ]; then
			unpacked_image_size=$(echo "$2"|grep -E '^[0-9]+$')
			if [ -z "$unpacked_image_size" ]; then pmsg $P_ERROR "invalid image size. Use only whole decimal numbers\n"; usage import_custom; fi
			shift
		fi
		image_name="$2"
		if [ -z "$image_name" ]; then pmsg $P_ERROR "missing image name\n"; usage import; fi
		image_name_stripped=$(echo "$image_name"|tr -d -C '[:alnum:]\-.')
		if [ "$image_name" != "$image_name_stripped" ]; then
			pmsg $P_ERROR "ImageName contains restricted characters, allowed are only letters, numbers, dot(.) and dash(-)\n"
			exit 1
		fi
		image_name_stripped2=$(echo "$image_name_stripped"|sed -e 's/-[0-9]\+$//')
		if [ "$image_name_stripped" != "$image_name_stripped2" ]; then
			pmsg $P_ERROR "ImageName cannot end with '-XX' where XX is number.\n"
			exit 1
		fi
		image_path="$3"
		# skip path check for "empty" image file
		if [ "$image_path" != "empty" ]; then
			check_file "$image_path" "image file"
			if [ "$?" = 2 ]; then  pmsg $P_ERROR "image file not found\n"; exit 2; fi
			image_path="$file_path"
		fi
		tmp_files=""
		image_size="$file_size"
		image_local="$file_local"
		image_extension="${image_path##*.}"
		case "$image_extension" in
			gz)
				if ! command -v gunzip >/dev/null 2>&1; then
					pmsg $P_ERROR "'gunzip' binary missing, install it to have support for GZ\n"
					exit 1
				fi
				decompress_cmd="gunzip -c"
				;;
			xz)
				if ! command -v xz >/dev/null 2>&1; then
					pmsg $P_ERROR "'xz' binary missing, install it to have support for XZ\n"
					exit 1
				fi
				decompress_cmd="xz -d -c"
				;;
			zst)
				if ! command -v zstd >/dev/null 2>&1; then
					pmsg $P_ERROR "'zstd' binary missing, install it to have support for ZST\n"
					exit 1
				fi
				decompress_cmd="zstd -d --stdout"
				;;
			empty)
				pmsg $P_DEBUG "we are creating empty image file\n"
				;;
			*)
				pmsg $P_ERROR "unknown image file extension $image_extension, (supported: xz, gz)\n"
				exit 1
				;;
		esac

		image_xml_path="$4"
		check_file "$image_xml_path" "XML VM definition"
		if [ "$?" = 2 ]; then pmsg $P_ERROR "XML file $image_xml_path not found\n"; exit 2; fi
		if [ "$file_local" = '0' ]; then
			image_xml_path=$(download_file "$image_xml_path")
			tmp_files="$tmp_files $image_xml_path"
		fi

		hack_file="$5"
		if [ -n "$hack_file" ]; then
			check_file "$hack_file" "hack file"
			if [ "$?" = 2 ]; then pmsg $P_ERROR "hack file $hack_file not found\n"; exit 2; fi
			if [ "$file_local" = '0' ]; then
				hack_file=$(download_file "$hack_file")
				tmp_files="$tmp_files $hack_file"
			fi
		fi
		delete_hack_file="$6"
		if [ -n "$delete_hack_file" ]; then
			check_file "$delete_hack_file" "delete hack file"
			if [ "$?" = 2 ]; then pmsg $P_ERROR "delete hack file $delete_hack_file not found\n"; exit 2; fi
			if [ "$file_local" = '0' ]; then
				delete_hack_file=$(download_file "$delete_hack_file")
				tmp_files="$tmp_files $delete_hack_file"
			fi
		fi

		# try to autodect the size of image from filename
		autodetected_size=$(basename "$image_path"|sed -nr 's/^([0-9]+)g__.*$/\1/gp')
		if [ "$1" = "import" ] && [ -n "$autodetected_size" ]; then
			unpacked_image_size=$autodetected_size
			pmsg $P_DEBUG "Size of image was determined from the filename to be ${autodetected_size}G.\n"
		fi

		if [ -b "/dev/$THINPOOL_VG/$VM_PREFIX$image_name" ]; then
			pmsg $P_ERROR "base image for '$image_name' version already exists. To remove image use 'remove' parameter\n"
			exit 1

		else
			pmsg $P_DEBUG "creating LV $VM_PREFIX$image_name ...\n"
			if ! echo "lvcreate" "base" "$image_name" "$unpacked_image_size" | sudo -n $FASTVM_HELPER; then
				pmsg $P_ERROR "Error creating thin LV for VM image\n"
				exit 1
			fi
		fi

		# change group of LV so we can use it for locking
		echo "chgrp" "/dev/$THINPOOL_VG/$VM_PREFIX$image_name" | sudo -n $FASTVM_HELPER
		(
		# locked section - BEGIN
		flock -x -n 9 || exit 4
		pmsg $P_DEBUG "importing image $image_path into /dev/$THINPOOL_VG/$VM_PREFIX$image_name\n"

		if [ "$image_path" = "empty" ]; then
			config_file_operation "cp $image_xml_path" "config-${image_name}.xml"
			pmsg $P_INFO "Empty image imported\n"
			exit 0
		fi

		if [ "$image_local" = "1" ]; then
			if [ "$pv_ok" -eq '0' ]; then
				$decompress_cmd "$image_path"| pv -s "${unpacked_image_size}G" | dd of="/dev/$THINPOOL_VG/$VM_PREFIX$image_name" bs=1M conv=sparse
				import_exit="$?"
			else
				pmsg $P_DEBUG "please wait while importing image (to show progress, install 'pv')\n"
				$decompress_cmd "$image_path"| dd of="/dev/$THINPOOL_VG/$VM_PREFIX$image_name" bs=1M conv=sparse
				import_exit="$?"
			fi
		else
			# import from http(s)
			if [ "$pv_ok" -eq '0' ]; then
				stty_state=$(stty -g) # save terminal state in case we neeed to restore it due to 'pv' breaking terminal 'echo'
				curl $CURL_OPTS -s "$image_path" | pv -N download -c -s "$image_size" | $decompress_cmd | pv -N unpack -c -s "${unpacked_image_size}G" | dd of="/dev/$THINPOOL_VG/$VM_PREFIX$image_name" bs=1M conv=sparse
				import_exit="$?"
				if $(stty -a|grep -q -E '\-echo[^a-z]'); then
					pmsg $P_DEBUG "Missing 'echo' on termninal after 'pv', restoring terminal settings.\n"
					# this should address issue #50 - https://github.com/OndrejHome/fast-vm/issues/50
					stty "$stty_state"
				fi
			else
				pmsg $P_DEBUG "please wait while importing image (to show image write progress, install 'pv')\n"
				curl $CURL_OPTS "$image_path" | $decompress_cmd | dd of="/dev/$THINPOOL_VG/$VM_PREFIX$image_name" bs=1M conv=sparse
				import_exit="$?"
			fi

		fi
		if [ "$import_exit" != "0" ]; then
			pmsg $P_ERROR "Error copying the image into thin LV\n"
			exit 1
		fi
		# copy the XML configuration file
		config_file_operation "cp $image_xml_path" "config-${image_name}.xml"
		config_file_operation "chmod +r" "config-${image_name}.xml"
		if [ -n "$hack_file" ] && [ -f "$hack_file" ]; then
			config_file_operation "cp $hack_file" "hacks-${image_name}.sh"
			config_file_operation "chmod +rx" "hacks-${image_name}.sh"
		fi
		if [ -n "$delete_hack_file" ] && [ -f "$delete_hack_file" ]; then
			config_file_operation "cp $delete_hack_file" "delete-hacks-${image_name}.sh"
			config_file_operation "chmod +rx" "delete-hacks-${image_name}.sh"
		fi
		## run image verification after importing image and hacks files, user can interrupt this to skip it
		$0 verify "$image_name" "$(dirname "$image_path")"

		pmsg $P_INFO "Image $image_name imported\n"
		rm -f -- $tmp_files # cleanup temporary files
		# locked section - END
		) 9<"/dev/$THINPOOL_VG/$VM_PREFIX$image_name"
		if [ "$?" != "0" ]; then
			pmsg $P_ERROR "It is not possible to import image $image_name now as it is being used by fast-vm or other process at the moment\n"
			exit 1
		else
			rm -f "/tmp/fast-vm.img.${image_name}.lock"
		fi
		;;
	export)
		image_name="$2"
		if [ -z "$image_name" ]; then pmsg $P_ERROR "missing image name\n"; usage export; fi
		check_image_existance "$image_name"

		lvs_out=$(echo 'lvs'|sudo -n $FASTVM_HELPER)
		image_size=$(echo "$lvs_out"|grep -E " ${VM_PREFIX}$image_name "|sed 's/\.[0-9]\+g//'|awk '{printf $2}')
		# get image format or use default 'xz' if no format was specified
		image_format="$3"
		if [ -z "$image_format" ]; then image_format='xz'; fi
		case "$image_format" in
			gz)
				if ! command -v gzip >/dev/null 2>&1; then
					pmsg $P_ERROR "'gzip' binary missing, install it to have support for GZ\n"
					exit 1
				fi
				compress_cmd="gzip -c"
				;;
			xz)
				if ! command -v xz >/dev/null 2>&1; then
					pmsg $P_ERROR "'xz' binary missing, install it to have support for XZ\n"
					exit 1
				fi
				compress_cmd="xz -c -k --best --block-size=16777216 -T 0"
				;;
			zst)
				if ! command -v zstd >/dev/null 2>&1; then
					pmsg $P_ERROR "'zstd' binary missing, install it to have support for ZST\n"
					exit 1
				fi
				compress_cmd="zstd -c -k -19 -T0 --stdout"
				;;
			*)
				pmsg $P_ERROR "unknown image format $image_format (supported: zst, xz, gz)\n"
				exit 1
				;;
		esac

		# change group of LV so we can use it for locking
		echo "chgrp" "/dev/$THINPOOL_VG/$VM_PREFIX$image_name" | sudo -n $FASTVM_HELPER
		(
		# locked section - BEGIN
		flock -s -n 9 || exit 4
		pmsg $P_DEBUG "compressing the image $image_name into $(pwd)/${image_size}g__${image_name}.img.${image_format}\n"
		if [ "$pv_ok" -eq '0' ]; then
			pv -N "Image reading" -s "${image_size}G" < "/dev/$THINPOOL_VG/$VM_PREFIX$image_name" | $compress_cmd > "$(pwd)/${image_size}g__${image_name}.img.${image_format}"
		else
			$compress_cmd < "/dev/$THINPOOL_VG/$VM_PREFIX$image_name" > "$(pwd)/${image_size}g__${image_name}.img.${image_format}"
		fi
		if [ "$?" -eq "0" ]; then
			pmsg $P_INFO "Image compression finished\n"
		else
			pmsg $P_ERROR "There was error compressing the image, check output above\n"
		fi
		# locked section - END
		) 9<"/dev/$THINPOOL_VG/$VM_PREFIX$image_name"
		if [ "$?" != "0" ]; then
			pmsg $P_ERROR "It is not possible to export image $image_name now as it is being used by fast-vm or other process at the moment\n"
			exit 1
		else
			rm -f "/tmp/fast-vm.img.${image_name}.lock"
		fi
		;;
	remove)
		image_name="$2"
		if [ -z "$image_name" ]; then pmsg $P_ERROR "missing image name\n"; usage remove; fi
		check_image_existance "$image_name"

		pmsg $P_DEBUG "stopping and undefining the base VM of $image_name\n"
		virsh --connect qemu:///system destroy "$VM_PREFIX$image_name" 2>&1|$DEBUG_LOG_CMD
		virsh --connect qemu:///system undefine "$VM_PREFIX$image_name" --nvram --managed-save 2>&1|$DEBUG_LOG_CMD
		pmsg $P_DEBUG "removing LV $VM_PREFIX$image_name ...\n"
		echo "lvremove" "/dev/$THINPOOL_VG/$VM_PREFIX$image_name" | sudo -n $FASTVM_HELPER
		pmsg $P_DEBUG "removing XML and hack file(s) of $image_name...\n"
		config_file_operation "rm" "config-${image_name}.xml"
		config_file_operation "rm" "hacks-${image_name}.sh"
		config_file_operation "rm" "delete-hacks-${image_name}.sh"
		pmsg $P_INFO "image $image_name removed\n"
		;;
	import_profile)
		profile_name="$2"
		if [ -z "$profile_name" ]; then pmsg $P_ERROR "missing profile name\n"; usage import_profile; fi
		profile_name_stripped=$(echo "$profile_name"|tr -d -C '[:alnum:]\-.')
		if [ "$profile_name" != "$profile_name_stripped" ]; then
			pmsg $P_ERROR "ProfileName contains restricted characters, allowed are only letters, numbers, dot(.) and dash(-)\n"
			exit 1
		fi
		profile_name_stripped2=$(echo "$profile_name_stripped"|sed -e 's/-[0-9]\+$//')
		if [ "$profile_name_stripped" != "$profile_name_stripped2" ]; then
			pmsg $P_ERROR "ProfileName cannot end with '-XX' where XX is number.\n"
			exit 1
		fi
		image_name="$3"
		if [ -z "$image_name" ]; then pmsg $P_ERROR "missing image name\n"; usage import_profile; fi
		check_image_existance "$image_name"
		tmp_files=""

		image_xml_path="$4"
		check_file "$image_xml_path" "XML VM definition"
		if [ "$?" = 2 ]; then pmsg $P_ERROR "XML file $image_xml_path not found\n"; exit 2; fi
		if [ "$file_local" = '0' ]; then
			image_xml_path=$(download_file "$image_xml_path")
			tmp_files="$tmp_files $image_xml_path"
		fi

		hack_file="$5"
		if [ -n "$hack_file" ]; then
			check_file "$hack_file" "hack file"
			if [ "$?" = 2 ]; then pmsg $P_ERROR "hack file $hack_file not found\n"; exit 2; fi
			if [ "$file_local" = '0' ]; then
				hack_file=$(download_file "$hack_file")
				tmp_files="$tmp_files $hack_file"
			fi
		fi
		delete_hack_file="$6"
		if [ -n "$delete_hack_file" ]; then
			check_file "$delete_hack_file" "delete hack file"
			if [ "$?" = 2 ]; then pmsg $P_ERROR "delete hack file $delete_hack_file not found\n"; exit 2; fi
			if [ "$file_local" = '0' ]; then
				delete_hack_file=$(download_file "$delete_hack_file")
				tmp_files="$tmp_files $delete_hack_file"
			fi
		fi

		# create profile and copy files to right places
		config_file_operation "mkdir" "${profile_name}"
		tmp_base_image=$(mktemp)
		tmp_files="$tmp_files $tmp_base_image"
                echo "$image_name" > "$tmp_base_image"
		config_file_operation "cp $tmp_base_image" "${profile_name}/base_image"
		config_file_operation "chmod +r" "${profile_name}/base_image"
		rm -f "$tmp_base_image"
		config_file_operation "cp $image_xml_path" "${profile_name}/config.xml"
		config_file_operation "chmod +r" "${profile_name}/config.xml"
		if [ -n "$hack_file" ] && [ -f "$hack_file" ]; then
			config_file_operation "cp $hack_file" "${profile_name}/hacks.sh"
			config_file_operation "chmod +rx" "${profile_name}/hacks.sh"
		fi
		if [ -n "$delete_hack_file" ] && [ -f "$delete_hack_file" ]; then
			config_file_operation "cp $delete_hack_file" "${profile_name}/delete-hacks.sh"
			config_file_operation "chmod +rx" "${profile_name}/delete-hacks.sh"
		fi

		rm -f -- $tmp_files # cleanup temporary files
		pmsg $P_INFO "Profile $profile_name based on Image $image_name imported\n"
		;;
	remove_profile)
		profile_name="$2"
		if [ -z "$profile_name" ]; then pmsg $P_ERROR "missing profile name\n"; usage remove_profile; fi

		if [ ! -d "$FASTVM_USER_CONF_DIR/${profile_name}" ] && [ ! -d "$FASTVM_SYSTEM_CONF_DIR/${profile_name}" ]; then
			pmsg $P_ERROR "profile '$profile_name' not found\n"
			usage remove_profile
		fi

		config_file_operation "rm -rf" "$profile_name"
		pmsg $P_INFO "Profile $profile_name removed\n"
		;;
	resize)
		image_name="$2"
		new_size=$(echo "$3"|grep -E '^[0-9]+$')

		if [ -z "$image_name" ]; then pmsg $P_ERROR "missing image name\n"; usage resize; fi
		check_image_existance "$image_name"
		if [ -z "$new_size" ]; then pmsg $P_ERROR "invalid image size. Use only whole decimal numbers\n"; usage resize; fi

		#FIXME due to handling of logging in fast-vm-helper we might not receive error code if something went wrong
		pmsg $P_DEBUG "resizing image $image_name to ${new_size}G\n"
		if echo "lvresize" "/dev/$THINPOOL_VG/$VM_PREFIX$image_name" "$new_size" | sudo -n $FASTVM_HELPER; then
			pmsg $P_INFO "Only newly created VMs from this image will use new size.\n"
			pmsg $P_INFO "Resize of image to ${new_size}G succeeded.\n"
		else
			pmsg $P_ERROR "Resize failed. Check logs for more details\n"
		fi
		;;
	list)
		short_output="$2" # if non-zero the output suitable for external processing
		# lets get the dm-XX number of the thinpool
		pool_dm=$(basename "$(readlink "$THINPOOL_PATH")")
		# from dm-XX of thinpool we can list the LVs inside the thinpool
		holders=$(ls "/sys/block/$pool_dm/holders")
		holder_regexp=""
		for dm in $holders
		do
			if [ -z "$holder_regexp" ]; then
				holder_regexp="$dm"
			else
				holder_regexp="$holder_regexp|$dm"
			fi
		done
		holder_regexp="($holder_regexp)"
		# finaly parse the VM image versions from what we have
		image_name_list=$(ls -l "/dev/$THINPOOL_VG/" |grep -E "$holder_regexp"|awk '{print $9}'|grep "$VM_PREFIX"|sed -e "s/$VM_PREFIX//; s/-[0-9]\+$//"|uniq)

		if [ -n "$short_output" ] && [ "$short_output" = "short" ]; then
			echo "$image_name_list"
		else
			printf '%-36s |%-21s |%-21s |\n' 'IMAGE' 'SYSTEM' 'USER'
			printf '%-20s   %13s |%-8s %-13s|%-8s %-13s|\n' 'Image name' 'Size( %used )' 'XML' 'Hack file for' 'XML' 'Hack file for'
			lvs_out=$(echo 'lvs'|sudo -n $FASTVM_HELPER)
			for image_name in $image_name_list; do
				# check the existence of the XML file
				if [ -f "$FASTVM_USER_CONF_DIR/config-${image_name}.xml" ]; then
					user_xml_exists="ok"
				else
					user_xml_exists="missing"
				fi
				# check existence of hack file
				user_hacks_exists="no hack files"
				if [ -f "$FASTVM_USER_CONF_DIR/hacks-${image_name}.sh" ]; then
					user_hacks_exists="create"
				fi
				if [ -f "$FASTVM_USER_CONF_DIR/delete-hacks-${image_name}.sh" ]; then
					user_hacks_exists="${user_hacks_exists},delete"
				fi
				# check the existence of the XML file
				if [ -f "$FASTVM_SYSTEM_CONF_DIR/config-${image_name}.xml" ]; then
					system_xml_exists="ok"
				else
					system_xml_exists="missing"
				fi
				# check existence of hack file
				system_hacks_exists="no hack files"
				if [ -f "$FASTVM_SYSTEM_CONF_DIR/hacks-${image_name}.sh" ]; then
					system_hacks_exists="create"
				fi
				if [ -f "$FASTVM_SYSTEM_CONF_DIR/delete-hacks-${image_name}.sh" ]; then
					system_hacks_exists=",delete"
				fi
				size=$(echo "$lvs_out"|grep -E " ${VM_PREFIX}$image_name "|sed 's/\.00g//'|awk '{printf "%3sg(%6s%%)",$2,$3}')
				printf "%-20s   %13s |%-8s %-13s|%-8s %-13s|\n" "$image_name" "$size" "$system_xml_exists" "$system_hacks_exists" "$user_xml_exists" "$user_hacks_exists"
			done
			printf "\nNOTE: if image is missing XML it wouldn't be possible to create a VM from it!\n Image with missing hack file(s) can work if it's not needed.\n"
			printf "\n USER XML and hack file(s) takes precendense before SYSTEM ones.\n"
		fi
		;;
	list_profiles)
		short_output="$2" # if non-zero the output suitable for external processing
		profile_dir_list=$(find "$FASTVM_SYSTEM_CONF_DIR/" "$FASTVM_USER_CONF_DIR/" -mindepth 1 -maxdepth 1 -type d 2>/dev/null)
		if [ -n "$short_output" ] && [ "$short_output" = "short" ]; then
			for dir in $profile_dir_list;
			do
				# valid profile must contain at least base image name
				if [ -f "$dir/base_image" ]; then
					basename "$dir"
				fi
			done
		else
			printf "%-41s|%-41s\n" 'Names' 'Changes provided by profile'
			printf "%-20s|%-20s|%-5s|%-7s|%-14s\n" 'Profile Name' 'Base Image Name' 'XML' 'hacks' 'delete-hacks'
			for dir in $profile_dir_list;
			do
				profile_name=$(basename "$dir")
				base_image_name=$(cat "$dir/base_image" 2>/dev/null)
				# skip directories not containing base image name
				if [ -z "$base_image_name" ]; then continue; fi
				profile_xml='no'
				profile_hacks='no'
				profile_delete_hacks='no'
				if [ -f "$dir/config.xml" ]; then profile_xml='yes'; fi
				if [ -f "$dir/hacks.sh" ]; then profile_hacks='yes'; fi
				if [ -f "$dir/delete-hacks.sh" ]; then profile_delete_hacks='yes'; fi
				printf "%-20s|%-20s|%-5s|%-7s|%-14s\n" "$profile_name" "$base_image_name" "$profile_xml" "$profile_hacks" "$profile_delete_hacks"
			done
		fi
		;;
	compact)
		image_name="$2"
		if [ -z "$image_name" ]; then pmsg $P_ERROR "missing image name\n"; usage compact; fi
		check_image_existance "$image_name"

		# change group of LV so we can clean it up
		echo "chgrp" "/dev/$THINPOOL_VG/$VM_PREFIX$image_name" | sudo -n $FASTVM_HELPER

		pmsg $P_INFO "Compacting disk of image $image_name ....\n"
		pmsg $P_DEBUG "Running 'virt-sparsify -q --in-place /dev/$THINPOOL_VG/$VM_PREFIX$image_name.\n"
		LIBGUESTFS_BACKEND=direct virt-sparsify -q --in-place "/dev/$THINPOOL_VG/$VM_PREFIX$image_name" 2>&1|$DEBUG_LOG_CMD

		;;
	verify)
		image_name="$2"
		if [ -z "$image_name" ]; then pmsg $P_ERROR "missing image name\n"; usage verify; fi
		check_image_existance "$image_name"
		image_checksum_dir="$3"
		if [ -z "$image_checksum_dir" ]; then image_checksum_dir='./'; fi
		check_file "$image_checksum_dir/${image_name}.part_00.sha512.txt" "part_00 checksum" "quiet"
		if [ "$?" = 2 ]; then  pmsg $P_ERROR "part_00 checksum file not found\n"; exit 2; fi

		lvs_out=$(echo 'lvs'|sudo -n $FASTVM_HELPER)
                size=$(echo "$lvs_out"|grep -E " ${VM_PREFIX}$image_name "|sed 's/\.[0-9]\+g//'|awk '{printf $2}')
		# change group of LV so we can clean it up
		echo "chgrp" "/dev/$THINPOOL_VG/$VM_PREFIX$image_name" | sudo -n $FASTVM_HELPER

		pmsg $P_INFO "Verifying image $image_name ($size) using checksums from $image_checksum_dir\n"
		parts_ok=0
		parts_fail=0
		parts_missing=0
		for part in $(seq -w 00 "$size");
		do
			check_file "$image_checksum_dir/${image_name}.part_${part}.sha512.txt" "part_${part} checksum"
			if [ "$?" = 2 ]; then
				parts_missing=$((parts_missing+1))
				pmsg $P_WARNING "part_${part} checksum file missing - $image_checksum_dir/${image_name}.part_${part}.sha512.txt\n"
			else
				# read the checksum from file
				if [ "$file_local" = '1' ]; then
					part_checksum=$(head -1 "$image_checksum_dir/${image_name}.part_${part}.sha512.txt")
				else
					part_checksum=$(curl $CURL_OPTS -s "$image_checksum_dir/${image_name}.part_${part}.sha512.txt"| head -1)
				fi
				# compute checksum of same part of imported image
				checksum=$(dd if="/dev/$THINPOOL_VG/${VM_PREFIX}$image_name" skip="$part" bs=1G count=1 2>/dev/null|sha512sum |awk '{print $1}')
				if [ "$part_checksum" = "$checksum" ]; then
					parts_ok=$((parts_ok+1))
					pmsg $P_DEBUG "part_${part} checksum OK\n"
				else
					parts_fail=$((parts_fail+1))
					pmsg $P_ERROR "part_${part} checksum failed\n"
				fi

			fi
		done
		if [ "$parts_fail" = '0' ] && [ "$parts_missing" = '0' ]; then
			pmsg $P_INFO "CHECK SUMMARY:   OK: $parts_ok  FAIL: $parts_fail  MISSING: $parts_missing\n"
		else
			pmsg $P_ERROR "CHECK SUMMARY:   OK: $parts_ok  FAIL: $parts_fail  MISSING: $parts_missing\n"
			exit 1
		fi
		;;
	gen_checksums)
		image_name="$2"
		if [ -z "$image_name" ]; then pmsg $P_ERROR "missing image name\n"; usage gen_checksums; fi
		check_image_existance "$image_name"

		## get image size
		lvs_out=$(echo 'lvs'|sudo -n $FASTVM_HELPER)
                size=$(echo "$lvs_out"|grep -E " ${VM_PREFIX}$image_name "|sed 's/\.[0-9]\+g//'|awk '{printf $2}')
		# change group of LV so we can clean it up
		echo "chgrp" "/dev/$THINPOOL_VG/$VM_PREFIX$image_name" | sudo -n $FASTVM_HELPER

		pmsg $P_INFO "Generating checksums for $image_name ($size)\n"
		for part in $(seq -w 00 "$size");
		do
			checksum=$(dd if="/dev/$THINPOOL_VG/${VM_PREFIX}$image_name" skip="$part" bs=1G count=1 2>/dev/null|sha512sum |awk '{print $1}')
			pmsg $P_DEBUG "${image_name}.part_${part}.sha512.txt: $checksum\n"
			echo "$checksum" > "${image_name}.part_${part}.sha512.txt"
		done
		;;
	*) 
		pmsg $P_ERROR "unknown action\n"
		usage
		;;
esac