lvm一键扩容到/根

#!/bin/sh

if [ ! $# -eq 1 ];then 
echo "请输入要lvm的磁盘，比如sdc"
exit 255
fi

dev_disk=/dev/$1
ls -l $dev_disk &>/dev/null
if [ ! $? -eq 0 ];then
echo "磁盘不存在"
exit 255
fi

res_pvs=`pvs|awk ‘{print $1}‘|grep $1$|wc -l`
res_lsblk=`lsblk |grep $1|grep /|wc -l`

if [ $res_pvs -eq 0 -a $res_lsblk -eq 0 ];then
echo "磁盘信息正确，正在扩容中。。"
else
echo "磁盘已经被使用，请确认磁盘"
exit 255 
fi

vg_name=`df -Th|grep /$|awk ‘{print $1}‘ |awk -F ‘/‘ ‘{print $NF}‘|awk -F ‘-‘ ‘{print $1}‘`
vg_group=`df -Th|grep /$|awk ‘{print $1}‘ |awk -F ‘/‘ ‘{print $NF}‘|sed -e ‘s/-/\//g‘`
pwd_group=/dev/${vg_group}
disk_type=`df -Th|grep /$|awk ‘{print $2}‘`

pvcreate $dev_disk
vgextend $vg_name $dev_disk
lvextend -l +100%FREE -n $pwd_group
if [ "$disk_type" == "xfs" ];then
xfs_growfs $pwd_group
else
resize2fs $pwd_group
fi 
echo "扩容后磁盘情况" 
echo "================================================================"
df -Th
echo "================================================================"
lsblk