To Android users

To emulate termux inside termux, Use the first version of termux-proot.

(Execute this outside termux-proot environment)

# Download the file of 1st version of termux-proot
curl -sLo ~/termux-proot.sh https://github.com/Yonle/termux-proot/raw/v1.0.0/termux

# Change permission
chmod +x ~/termux-proot.sh

# Start sandbox
~/termux-proot.sh

termux-proot

A sandboxed, 2nd termux, isolated or jailed termux environment with proot

Test something out in sandboxed environment with 0% Afraid of getting bricked in your real termux. Human is curious, Ain't we?

Also support on non-Android distro, Including Debian, Alpine, and etc.

Setup & Installation

Before installing, We need these 3 packages to be installed in your Termux:

git to fetching Android base from termux-docker.
curl for fetching & downloading latest termux bootstrap.
unzip for unzipping Termux Bootstrap.
proot for start sandboxed environment.

These required packages should be installed in your host/system.

And finally, set up sandboxed environment:

curl -sLO git.io/termux-proot.sh
chmod +x termux-proot.sh

# Will setup by itself & start sandboxed environment
./termux-proot.sh

Uninstalling

Uninstalling termux-proot is literally, very easy.

rm termux-proot.sh

# The command below can use for reinstalling.
proot -0 rm -rf ~/.termux-fs

# The command below can use for reinstalling/Updating Android base system.
proot -0 rm -rf ~/.android-base

Environment Variables

termux-proot also has it's own environment variables and it's changeable. They are:

TERMUX_SANDBOX_PATH - Path to where Termux sandbox folder located. Default is $HOME/.termux-fs
TERMUX_SANDBOX_APPPATH - A variable that used to simulate Termux app path. Default is /data/data/com.termux
TERMUX_SANDBOX_ENV - A variable that used to reveal a environment variable to guest. Can used like TERMUX_SANDBOX_ENV="FOO=BAR BAR=FOO" ./termux-proot.sh
TERMUX_SANDBOX_PROOT_OPTIONS - A variable that used to add some proot arguments. Can used like TERMUX_SANDBOX_PROOT_OPTIONS="-b /sdcard" ./termux-proot.sh
TERMUX_ANDROID_BASE - Path to Android base system. Default is $HOME/.android-base

Advantages

Sandboxed /system
More secured

Disadvantages

DNS is static. Should using static resolver that located at /etc/hosts or /system/etc/hosts. You may need to echo unresolved-domain.com >> /system/etc/static-dns-hosts.txt and run /system/bin/update-static-dns to get your unresolved-domain.com work.
Some certain thing is not available (like OpenSLES, dalvikvm, and etc).
ARM variant may require a custom seccomp profile to remove restrictions from personality() system call. Whereas Docker Hub contains prebuilt ARM image, it is outdated and won't receive updates anymore.

Yonle/termux-proot