From 4e259c28650ac0ce7da232949fdd0dd8282840ea Mon Sep 17 00:00:00 2001
From: "Kevin Veen-Birkenbach [aka. Frantz]" <kevin@veen.world>
Date: Thu, 30 Apr 2020 17:42:37 +0200
Subject: [PATCH] Added chroot script for debugging

---
 README.md       |  4 +--
 chroot-to-pi.sh | 69 +++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 71 insertions(+), 2 deletions(-)
 create mode 100644 chroot-to-pi.sh

diff --git a/README.md b/README.md
index 7576bff..3293add 100644
--- a/README.md
+++ b/README.md
@@ -27,8 +27,8 @@ To pase the configuration to the program use this syntax:
   #echo "n"                 # ├── Overwrite device before copying
   echo "test12345"          # | The user password
   echo "test12345"          # | The root password
-  echo "example-host"       # | The hostname 
-  echo "y"                  # | Copy wifi configurations to target system
+  echo "example-host"       # | The hostname
+  echo "y"                  # | Setup Wifi on target system
 )| sudo bash ./sd_setup.sh
 ```
 
diff --git a/chroot-to-pi.sh b/chroot-to-pi.sh
new file mode 100644
index 0000000..859e350
--- /dev/null
+++ b/chroot-to-pi.sh
@@ -0,0 +1,69 @@
+#!/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,}