Single script to login chroot on android

chroot.sh

#!/usr/bin/sh
# Execute from Termux app, running as root results no sound.
# Must have pulseaudio and termux-x11.
# Must have root access.

if [ "$(id -u)" -eq "$TERMUX_APP__UID" ]; then
	### Start pulseaudio
	pulseaudio --start --load=" \
		module-native-protocol-tcp auth-ip-acl=127.0.0.1 \
		auth-anonymous=1" --exit-idle-time=-1

	### Run again as root
	su -c sh "$(pwd)"/"$0"
fi

if [ "$(id -u)" -eq "0" ]; then
	### Mount directories
	rootdir='/data/archlinux'
	mnt_dirs='/dev /sys /proc /sdcard'
	mount -o remount,dev,suid /data
	for dirs in $mnt_dirs; do
	mount --bind "$dirs" "$rootdir""$dirs"; done
	mount --bind /dev/pts "$rootdir"/dev/pts
	mkdir -p /dev/shm
	mount -t tmpfs tmpfs /dev/shm
	mount --bind /dev/shm "$rootdir"/dev/shm
	mount --bind "$TMPDIR" "$rootdir"/tmp

	### Start Termux:X11
        unset LD_LIBRARY_PATH LD_PRELOAD
        env \
		TMPDIR="$rootdir"/tmp \
	        XKB_CONFIG_ROOT="$rootdir"/usr/share/X11/xkb \
	        CLASSPATH="$(/system/bin/pm path com.termux.x11 | cut -d: -f2)" \
        app_process / com.termux.x11.CmdEntryPoint :0 &

	### Login chroot
	chroot "$rootdir" /bin/su -l ilhan

	### Kill tasks
	pkill -f "app_process.*x11"
	pkill -f "pulseaudio"

	### Unmount directories
	umount "$rootdir"/dev/pts
	umount "$rootdir"/tmp
	for dirs in $mnt_dirs; do
	umount "$rootdir""$dirs"; done
	umount "$rootdir"/dev/shm
	umount /dev/shm
	rmdir /dev/shm
fi