htruong/chroot-to-pi.sh

## chroot-to-pi.sh
#!/bin/bash

# This script allows you to chroot ("work on")
# the raspbian sd card as if it's the raspberry pi
# on your Ubuntu desktop/laptop
# just much faster and more convenient

# credits: https://gist.github.com/jkullick/9b02c2061fbdf4a6c4e8a78f1312a689

# make sure you have issued
# (sudo) apt install qemu qemu-user-static binfmt-support

# Write the raspbian image onto the sd card,
# boot the pi with the card once
# so it expands the fs automatically
# then plug back to your laptop/desktop
# and chroot to it with this script.

# Invoke:
# (sudo) ./chroot-to-pi.sh /dev/sdb
# assuming /dev/sdb is your sd-card
# if you don't know, when you plug the card in, type:
# dmesg | tail -n30


# Note: If you have an image file instead of the sd card,
# you will need to issue
# (sudo) apt install kpartx
# (sudo) kpartx -v -a 2017-11-29-raspbian-stretch-lite.img
# then
# (sudo) ./chroot-to-pi.sh /dev/mapper/loop0p
# With the vanilla image, you have very little space to work on
# I have not figured out a reliable way to resize it
# Something like this should work, but it didn't in my experience
# https://gist.github.com/htruong/0271d84ae81ee1d301293d126a5ad716
# so it's better just to let the pi resize the partitions

mkdir -p /mnt/raspbian

# mount partition
mount -o rw ${1}2  /mnt/raspbian
mount -o rw ${1}1 /mnt/raspbian/boot

# mount binds
mount --bind /dev /mnt/raspbian/dev/
mount --bind /sys /mnt/raspbian/sys/
mount --bind /proc /mnt/raspbian/proc/
mount --bind /dev/pts /mnt/raspbian/dev/pts

# ld.so.preload fix
sed -i 's/^/#CHROOT /g' /mnt/raspbian/etc/ld.so.preload

# copy qemu binary
cp /usr/bin/qemu-arm-static /mnt/raspbian/usr/bin/

echo "You will be transferred to the bash shell now."
echo "Issue 'exit' when you are done."
echo "Issue 'su pi' if you need to work as the user pi."

# chroot to raspbian
chroot /mnt/raspbian /bin/bash

# ----------------------------
# Clean up
# revert ld.so.preload fix
sed -i 's/^#CHROOT //g' /mnt/raspbian/etc/ld.so.preload

# unmount everything
umount /mnt/raspbian/{dev/pts,dev,sys,proc,boot,}
	#!/bin/bash

	# This script allows you to chroot ("work on")
	# the raspbian sd card as if it's the raspberry pi
	# on your Ubuntu desktop/laptop
	# just much faster and more convenient

	# credits: https://gist.github.com/jkullick/9b02c2061fbdf4a6c4e8a78f1312a689

	# make sure you have issued
	# (sudo) apt install qemu qemu-user-static binfmt-support

	# Write the raspbian image onto the sd card,
	# boot the pi with the card once
	# so it expands the fs automatically
	# then plug back to your laptop/desktop
	# and chroot to it with this script.

	# Invoke:
	# (sudo) ./chroot-to-pi.sh /dev/sdb
	# assuming /dev/sdb is your sd-card
	# if you don't know, when you plug the card in, type:
	# dmesg \| tail -n30


	# Note: If you have an image file instead of the sd card,
	# you will need to issue
	# (sudo) apt install kpartx
	# (sudo) kpartx -v -a 2017-11-29-raspbian-stretch-lite.img
	# then
	# (sudo) ./chroot-to-pi.sh /dev/mapper/loop0p
	# With the vanilla image, you have very little space to work on
	# I have not figured out a reliable way to resize it
	# Something like this should work, but it didn't in my experience
	# https://gist.github.com/htruong/0271d84ae81ee1d301293d126a5ad716
	# so it's better just to let the pi resize the partitions

	mkdir -p /mnt/raspbian

	# mount partition
	mount -o rw ${1}2 /mnt/raspbian
	mount -o rw ${1}1 /mnt/raspbian/boot

	# mount binds
	mount --bind /dev /mnt/raspbian/dev/
	mount --bind /sys /mnt/raspbian/sys/
	mount --bind /proc /mnt/raspbian/proc/
	mount --bind /dev/pts /mnt/raspbian/dev/pts

	# ld.so.preload fix
	sed -i 's/^/#CHROOT /g' /mnt/raspbian/etc/ld.so.preload

	# copy qemu binary
	cp /usr/bin/qemu-arm-static /mnt/raspbian/usr/bin/

	echo "You will be transferred to the bash shell now."
	echo "Issue 'exit' when you are done."
	echo "Issue 'su pi' if you need to work as the user pi."

	# chroot to raspbian
	chroot /mnt/raspbian /bin/bash

	# ----------------------------
	# Clean up
	# revert ld.so.preload fix
	sed -i 's/^#CHROOT //g' /mnt/raspbian/etc/ld.so.preload

	# unmount everything
	umount /mnt/raspbian/{dev/pts,dev,sys,proc,boot,}