Circlean/proper_chroot.sh

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#!/bin/bash
if [ "$(id -u)" != "0" ]; then
echo "This script must be run as root" 1>&2
exit 1
fi
ls /usr/bin/qemu*arm* > /dev/null 2>&1
if [ ! -e ${?} ]; then
echo "You need qemu user static binaries." 1>&2
exit 1
fi
set -e
set -x
# If you use a partition...
PARTITION_ROOTFS='/dev/mmcblk0p2'
PARTITION_BOOT='/dev/mmcblk0p1'
# If you use the img
IMAGE='2013-02-09-wheezy-raspbian.img'
OFFSET_ROOTFS=$((122880 * 512))
OFFSET_BOOT=$((8192 * 512))
CHROOT_PATH='/mnt/arm_rPi'
clean(){
mv ${CHROOT_PATH}/etc/ld.so.preload_bkp ${CHROOT_PATH}/etc/ld.so.preload
rm ${CHROOT_PATH}/etc/resolv.conf
rm ${CHROOT_PATH}/usr/bin/qemu*arm*
umount ${CHROOT_PATH}/dev/pts
umount ${CHROOT_PATH}/dev/shm
umount ${CHROOT_PATH}/dev
umount ${CHROOT_PATH}/proc
umount ${CHROOT_PATH}/sys
umount ${CHROOT_PATH}/tmp
umount ${CHROOT_PATH}/boot
umount ${CHROOT_PATH}
rm -rf ${CHROOT_PATH}
}
trap clean EXIT TERM INT
mkdir -p ${CHROOT_PATH}
if [ -a ${IMAGE} ]; then
mount -o loop,offset=${OFFSET_ROOTFS} ${IMAGE} ${CHROOT_PATH}
mount -o loop,offset=${OFFSET_BOOT} ${IMAGE} ${CHROOT_PATH}/boot
elif [ -a ${PARTITION_ROOTFS} ]; then
mount ${PARTITION_ROOTFS} ${CHROOT_PATH}
mount ${PARTITION_BOOT} ${CHROOT_PATH}/boot
else
print 'You need a SD card or an image'
exit
fi
cp /usr/bin/qemu*arm* ${CHROOT_PATH}/usr/bin/
mount -o bind /dev ${CHROOT_PATH}/dev
mount -o bind /dev/pts ${CHROOT_PATH}/dev/pts
mount -o bind /dev/shm ${CHROOT_PATH}/dev/shm
mount -o bind /proc ${CHROOT_PATH}/proc
mount -o bind /sys ${CHROOT_PATH}/sys
mount -o bind /tmp ${CHROOT_PATH}/tmp
cp -pf /etc/resolv.conf ${CHROOT_PATH}/etc
mv ${CHROOT_PATH}/etc/ld.so.preload ${CHROOT_PATH}/etc/ld.so.preload_bkp
chroot ${CHROOT_PATH}