LOG_FILE="/var/log/install.log"
dev_LOG="/dev/tty6"
TARGET="/mnt"
TMP_DIR="/tmp"

# just for debug, also can use in  run time
LOG="stdout"
#PKG_SOURCE_DIR="/Rocky/packages"


DATE=$(date "+%Y/%m/%d %T")

log ()
{
	case "$LOG" in
		true) printf "$DATE $*\n" >>"$LOG_FILE" ;;
		stdout) printf "$DATE $*\n"  ;;
		*) : ;;
	esac
}

err ()
{
	log "error: $0: $*" >&2
}

warn ()
{
	log "warning: $0: $*" >&2
}

info ()
{
	log "info: $0: $*"
}

# erv stands for "Evaluate Return Value"
erv ()
{
	ret="${?}"
	if [ "$ret" -ne 0 ];then
		exit $ret
	fi
}

cleanup ()
{
	rm -f $*
}

#
# check mountpoint whether is duplicate
#
check_duplicate_mountpoint ()
{
	if [ -s "$MOUNTPOINT_CONF" ];then
		dup=$(awk '{print $2}' "$MOUNTPOINT_CONF" | sort | uniq -d)

		if [ -n "$dup" ];then
			err "mountpoint: \""$(echo $dup|tr " " "," )"\" is duplicate !"
			return 4
		fi
		return 0
	else
		err "$MOUNTPOINT_CONF file is empty or doesn't exist !"
		return 8
	fi
}

#
# check partition whether is duplicate
#
check_duplicate_partition ()
{
	if [ -s "$MOUNTPOINT_CONF" ];then
		dup=$(awk '{print $1}' "$MOUNTPOINT_CONF" | sort | uniq -d)

		if [ -n "$dup" ];then
			err "partition: \""$(echo $dup|tr " " "," )"\" is duplicate !"
			return 5
		fi
		return 0
	else
		err "$MOUNTPOINT_CONF file is empty or doesn't exist !"
		return 8
	fi
}

#
# check root whether will mounted
#
check_root ()
{
	if [ -s "$MOUNTPOINT_CONF" ];then
		if ! grep -q "[[:space:]]/[[:space:]]" $MOUNTPOINT_CONF;then
			err "\"/\" partition can not be empty!"
			return 6
		fi
		return 0
	else
		err "$MOUNTPOINT_CONF file is empty or doesn't exist !"
		return 8
	fi
}

#
# check /boot partition whether exist, if root partition is mounted by raid device 
#
check_boot ()
{
	if [ -s "$MOUNTPOINT_CONF" ];then
		if grep  " / " $MOUNTPOINT_CONF|grep -q "md" && ! grep -q " /boot " $MOUNTPOINT_CONF; then
			err "boot parition mustn't mount alone, when root partition mount at raid devices !"
			return 7
		fi
		return 0
	else
		err "$MOUNTPOINT_CONF file is empty or doesn't exist !"
		return 8
	fi
}


# recursively umount
# arg can is a device node or mountpoint
# ex:	1.reumount /dev/hda5
#		2.reumount /mnt/
reumount ()
{
	if [ $# -ne 1 ];then
		err "$FUNCNAME function argument error, it must be 1 !"
		return 1
	fi
	
	local arg="$1"
	local mountpoint

	# if arg is a device node
	if [ ! -d "$arg" ];then
		mountpoint=$(dirname `grep "^$arg " /proc/mounts|awk '{print $2}'`)
	else
		mountpoint="$arg"
	fi
	for mp in $(grep "$mountpoint" /proc/mounts|sort -k2 -r |awk '{print $2}');do
		umount $mp 1>"$dev_LOG" 2>&1
	done
}