#!/bin/bash

parse_device(){
	device=$1
	if echo $device | grep -E -q "^UUID="; then
		echo $device | sed 's:^UUID=:/dev/disk/by-uuid/:' | tr -d "\n"
	elif echo $device | grep -E -q "^LABEL="; then
		echo $device | sed 's:^LABEL=:/dev/disk/by-label/:' | tr -d "\n"
	else
		echo $device | tr -d "\n"
	fi
}

findmnt_dev()
{
	fstab_path=$1
	target_dir=$2
	cat "$fstab_path" | grep -Ev "^#" | awk '{print $1 " " $2 " " $3 " " $4 " " $5 " " $6}' |
	while read device mntdir fstype options dump passno ;
	do
		if [ "$mntdir" = "$target_dir" ] ; then
			parse_device "$device"
			break
		fi
	done
}

is_remote(){
	fstype=$1
	if [ nfs = "$fstype" ] || [ nfs4 = "$fstype" ] || [ smbfs = "$fstype" ] || [ cifs = "$fstype" ] || [ coda = "$fstype" ] || [ ncp = "$fstype"  ]; then
	echo yes
	elif [ ncpfs = "$fstype" ] || [ ocfs2 = "$fstype" ] || [ gfs = "$fstype" ] || [ gfs2 = "$fstype" ] || [ ceph = "$fstype" ]; then
	echo yes
	else
	echo no
	fi
}

parse_options(){
	options=$1
	optstr="showthrough bootwait nobootwait timeout ro"
	echo "$options" | awk -v optstr="$optstr" 'BEGIN{FS=","; split(optstr, opts, " ");} {
		result="";
		for( i=1; i<=NF; i++ ){
			flag=0;
			for( opt in opts ){
				if( $i == opts[opt] ){
					flag=1;
					break;
				}
			}
			if( flag == 1 )
				continue;

			if( i==1 )
				result=$i;
			else
				result=result","$i;
		}

		print result
	}'
}

is_system_partition(){
	mntdir=$1
	sys_parts="/boot /home /var /usr /srv /opt /usr/local"	# files under /tmp is temporary, need to remove

	echo $sys_parts | grep -Eq "(^| )"$mntdir"( |$)" && echo "yes" || echo "no"
}



mount_fstab(){
	fstab_path=${rootmnt}/etc/fstab
	if [ ! -e "$fstab_path" ]; then
	    fstab_path=/etc/fstab-backup
	fi
	
	# 将/usr/share/initramfs-tools/scripts/local-bottom/kybackup脚本放到/usr/share/initramfs-tools/scripts/init-bottom下后，在备份还原前就已经mount了各个分区（bind的没有mount）
	echo "rw mode remount $fstab_path begin"
        local mounted_path=
	local tmp_path=
	cat "$fstab_path" | grep -Ev "^#" | awk '{print $1 " " $2 " " $3 " " $4 " " $5 " " $6}' |
	while read device mntdir fstype options dump passno ;
	do
		device=$(parse_device $device)
		#mntopts=$(parse_options $options)
		mntopts=defaults,rw

		#nodev filesystems
		( cat /proc/filesystems | grep "$fstype" | grep -q nodev ) && continue

		#virtual or network filesystems
		([ none = "$mntdir" ] || [ yes = $(is_remote $fstype) ]) && continue

		#swap or backup分区，backup分区后面单独挂载，根分区已挂载
		([ swap = "$fstype" ] || [ /backup = "$mntdir" ] || [ / = "$mntdir" ]) && continue

		#not system partition
		#[ no = $(is_system_partition $mntdir) ] && continue

		#去掉首字符'/'
		#mntdir_name=$(echo $mntdir | sed 's:^/::g')
		#target_mntdir="/$(echo $mntdir_name | sed 's:/:-:g').orig"
		target_mntdir=${rootmnt}${mntdir}
                mounted_path=
	        tmp_path=	
		mkdir -p "$target_mntdir"
		tmp_path=$target_mntdir
		mounted_path=$(mount | awk -v v_path=${tmp_path} '{ if($3 == v_path) print $3 }')
		if [[ $options =~ bind ]] ; then
		    echo "mount -o $options ${rootmnt}${device} $target_mntdir"
		    mount -o $options "${rootmnt}${device}" "$target_mntdir"
	        elif [ "x" == "x"${mounted_path} ]; then
		    echo "mount -n -t $fstype -o $mntopts $device $target_mntdir"
                    mount -n -t $fstype -o $mntopts $device "$target_mntdir"
		else
		    # echo "mount -n -t $fstype -o $mntopts $device $target_mntdir"
		    # mount -n -t $fstype -o $mntopts $device "$target_mntdir"
		    echo "mount -o rw,remount $target_mntdir"
		    mount -o rw,remount "$target_mntdir"
		fi

		#如果一个分区已经安装了，则下列会报错后不再继续
		#if [ $? -ne 0 ]; then
		#	panic "Failed to mount %s on %s" "$device" "$target_mntdir"
		#	break
		#fi

	done || exit 1
	echo "rw mode remount $fstab_path end"
	mount
}

mount_fstab