Introduction

These baids will setup a chroot inside a Termux [0] shell by downloading an Ubuntu core cloud image [1] and allow executing commands by using proot [2].

Instructions

• Install termux [0] and spawn a shell
• Setup copy+paste snippet:

# install depends
which git || pkg install git
# install baids
curl -sSL https://raw.githubusercontent.com/rcmorano/baids/master/baids | bash -s install
source ~/.baids/baids
# install these baids
git clone https://github.com/rcmorano/termux-ubuntu-baids.git  ~/.baids/functions.d/termux-ubuntu-baids
baids-reload

• Setup an ubuntu-bionic chroot (or let it be done by the fisrt shell/exec baid execution):

termux-ubuntu-setup bionic

• Spawn an ubuntu-focal shell:

termux-ubuntu-shell focal 

• Execute a specific command into a ubuntu-bionic chroot:

termux-ubuntu-exec bionic cat /etc/lsb-release

Misc

Setup SSH server

• Run inside an ubuntu-shell:

apt-get update -qq && apt-get install -y openssh-server
# set ssh server to listen on an unprivileged port
sed -i 's|^#Port=.*|Port=44444' /etc/ssh/sshd_config
service ssh start

• Add some ssh pubkeys or setup an user (root user does not have any passwd set by default)