mount Raspberry Pi image, copy qemu-arm-static and chroot into it to tweak it

mount-rpi-image.sh

#!/bin/sh -xe

# mount Raspberry Pi image, copy qemu-arm-static and chroot into it to tweak it

dir=/tmp/rpi

test "umount" = "$1" && sudo umount $dir/boot && sudo umount $dir

image=$1
test -r "$image" || ( echo "Usage: $0 /path/to/rpi.img" && exit 1 )

o_boot=`sudo sfdisk -l $image | grep FAT32 | awk '{ print $2 }'`
o_linux=`sudo sfdisk -l $image | grep Linux | awk '{ print $2 }'`

echo "mount $o_linux and $o_boot"

test -d $dir || mkdir $dir
sudo mount -o offset=`expr $o_linux \* 512`,loop $image $dir
sudo mount -o offset=`expr $o_boot  \* 512`,loop $image $dir/boot
test -f $dir/usr/bin/qemu-arm-static || cp `which qemu-arm-static` $dir/usr/bin/
sudo chroot $dir
sudo umount $dir/boot
sudo umount $dir