Purpose

Create a loopback-based debian chroot on your Android device, in which you can do whatever you want (security stuff, development, hosting, etc.). Creating a chroot manually is very easy, but many errors can occur. This script consequently provides as much automation as possible, but stops upon errors to let you investigate what's wrong. If you can fix it, then create a PR. If you can't, create a new issue.

Requirements

You need:

• a rooted phone or tabled
• ADB enabled, with root access

Tested with:

• Samsung Galaxy S3 Neo (GT-I9301I)
• CM 12.1-20161031-NIGHTLY-s3ve3g (Android 5.1.1)
• Debian stable/jessie chroot
• Installation from Archlinux

Usage

Create chroot (on your GNU/Linux box)

• edit env.sh according to your needs
• run ./android_chroot.sh
• enter the chroot (see below), and follow the official guide to setup the system according to your needs

Use chroot (on your device)

First go in the chroot directory you defined in env.sh, then:

• mount chroot filesystem:

  /system/bin/sh -x ./debian_mount.sh

• enter chroot:

  chroot <CHROOTDIRNAME> /bin/bash

• umount chroot filesystem:

  /system/bin/sh -x ./debian_umount.sh