#!/bin/bash
|
# This shell script used mount/umount an linux system image and update it
|
|
mnt_boot=boot
|
mnt_root=rootfs
|
|
function mount_image()
|
{
|
img_file=$1
|
loop_dev=`losetup -f | cut -d/ -f3`
|
|
if [ ! -s $img_file ] ; then
|
echo "ERROR: $img_file not found!"
|
exit 1;
|
fi
|
|
if [ -z $loop_dev ] ; then
|
echo "ERROR: loop dev not found!"
|
exit 2;
|
fi
|
|
echo "INFO: losetup /dev/${loop_dev} ${img_file}"
|
losetup /dev/${loop_dev} ${img_file}
|
if [ $? != 0 ] ; then
|
echo "ERROR: losetup /dev/${loop_dev} ${img_file} failed!"
|
exit 3;
|
fi
|
|
echo "INFO: kpartx -av /dev/${loop_dev}"
|
kpartx -av /dev/${loop_dev}
|
|
echo "INFO: mount ${mnt_boot} ${mnt_root}"
|
mkdir -p ${mnt_boot} ${mnt_root}
|
mount /dev/mapper/${loop_dev}p1 ${mnt_boot}
|
mount /dev/mapper/${loop_dev}p2 ${mnt_root}
|
|
echo "INFO: mount $img_file done."
|
}
|
|
function umount_image()
|
{
|
img_file=$1
|
|
mountpoint $mnt_boot > /dev/null 2>&1
|
if [ $? == 0 ] ; then
|
echo "INFO: umount ${mnt_boot}"
|
umount ${mnt_boot}
|
rmdir ${mnt_boot}
|
fi
|
|
mountpoint $mnt_root > /dev/null 2>&1
|
if [ $? == 0 ] ; then
|
echo "INFO: umount ${mnt_root}"
|
umount ${mnt_root}
|
rmdir ${mnt_root}
|
fi
|
|
# loop_dev should be 'loopX' such as 'loop9'.
|
loop_dev=`losetup -a | grep $img_file| cut -d: -f1 | cut -d/ -f3`
|
if [[ -z $loop_dev ]] ; then
|
exit;
|
fi
|
|
if [[ -e /dev/mapper/${loop_dev}p1 ]] ; then
|
echo "INFO: kpartx -dv /dev/${loop_dev}"
|
kpartx -dv /dev/${loop_dev}
|
fi
|
|
echo "INFO: losetup -d /dev/${loop_dev}"
|
losetup -d /dev/${loop_dev}
|
|
echo "INFO: umount $img_file done."
|
}
|
|
|
function do_usage()
|
{
|
echo ""
|
echo "Usage:"
|
echo " $0 [-m] [-u] image_file"
|
echo " -m: mount the image file"
|
echo " -u: umount the image file"
|
echo ""
|
exit;
|
}
|
|
action=
|
img_file=
|
|
while getopts "mu" OPTNAME
|
do
|
case "${OPTNAME}" in
|
"m")
|
action=mount
|
;;
|
|
"u")
|
action=umount
|
;;
|
|
"*")
|
do_usage
|
;;
|
esac
|
done
|
|
shift $(( $OPTIND-1 ))
|
img_file=$1
|
|
if [[ -z $img_file ]] || [[ -z $action ]] ; then
|
do_usage
|
exit;
|
fi
|
|
if [ $action == "mount" ] ; then
|
mount_image $img_file
|
elif [ $action == "umount" ] ; then
|
umount_image $img_file
|
fi
|
