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#!/bin/bash
#
# Chroot to an RPI image or device (sdcard)
#
# usage: rpi_mount image
#
# Copyright (c) 2012 John Lane
#
# MIT License
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
#
# http://www.opensource.org/licenses/mit-license.php
if [[ $(id -u ) != 0 ]]; then
echo "Must be root"
else
if [[ -b $1 ]]; then
# mount a device
[[ ${1:5:6} == mmcblk ]] && partition_prefix="p"
boot_partition=${1}${partition_prefix}1
root_partition=${1}${partition_prefix}2
elif [[ -f $1 ]]; then
if [[ "$(file -b myimage | awk -F ';' '{print $1}')" == "x86 boot sector" ]]; then
# loop mount an image
lsmod | grep loop > /dev/null || modprobe loop
loop_device=$(losetup -f)
losetup -P $loop_device $1
boot_partition=${loop_device}p1
root_partition=${loop_device}p2
fi
elif [[ -d $1 ]]; then
# directory
chroot_dir=$1
else
echo "Don't know how to handle $1. Sorry"
exit -1
fi
if [[ ! -z "${boot_partition}" ]]; then
temp_mountpoint=$(mktemp -d)
mount $root_partition $temp_mountpoint
mkdir -p $temp_mountpoint/boot
mount $boot_partition $temp_mountpoint/boot
chroot_dir=$temp_mountpoint
fi
# Allow transparent emulation with QEMU for ARM chroot
if [[ (-x /usr/bin/qemu-arm-static) && ($(file $chroot_dir/sbin/init | awk -F ', ' '{print $2}') == ARM) && ($(uname -m) != ARM) ]]; then
cp /usr/bin/qemu-arm-static $chroot_dir/usr/bin
# mount binfmt_misc proc space if not already mounted
mount | grep /proc/sys/fs/binfmt_misc > /dev/null || mount binfmt_misc -t binfmt_misc /proc/sys/fs/binfmt_misc
# register arm format if not already registered
[[ -f /proc/sys/fs/binfmt_misc/arm ]] || echo ':arm:M::\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x28\x00:\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff:/usr/bin/qemu-arm-static:' > /proc/sys/fs/binfmt_misc/register
fi
# copy in terminfo
ti=$(find /usr/share/terminfo -name $TERM -type f)
[[ ! -z $ti ]] && cp $ti $chroot_dir/$ti
mkdir -p $chroot_dir/{proc,dev/pts}
mount proc -t proc $chroot_dir/proc
mount devpts -t devpts $chroot_dir/dev/pts
echo "Entering chroot $chroot_dir. Type 'exit' when done..."
#chroot $chroot_dir /usr/bin/env TERM="vt100" PS1='FooFoo \u' /bin/bash --noprofile --norc
chroot $chroot_dir /usr/bin/env -i TERM="$TERM" /bin/bash --login
umount $chroot_dir/dev/pts $chroot_dir/proc
if [[ ! -z $temp_mountpoint ]]; then
umount $temp_mountpoint/boot $temp_mountpoint
rmdir $temp_mountpoint
fi
fi
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