setup-chroot.sh

#!/system/bin/sh
#
# Docker on Android Chroot Setup Script
# Author: shitodcy
#

echo "Docker on Android - Alpine Chroot Setup"
echo "Author: shitodcy"

if [ "$(id -u)" != "0" ]; then 
echo "[!] This script must be run as ROOT (su)!" 
exit 1
fi

CHROOT_DIR="/data/alpine-docker"

echo "[*] Created chroot directory in $CHROOT_DIR..."
mkdir -p $CHROOT_DIR

echo "[*] Downloading Alpine Linux Mini RootFS (aarch64)..."
curl -Lo /data/alpine-minirootfs.tar.gz https://dl-cdn.alpinelinux.org/alpine/v3.19/releases/aarch64/alpine-minirootfs-3.19.1-aarch64.tar.gz

echo "[*] Extracting RootFS..."
tar -xf /data/alpine-minirootfs.tar.gz -C $CHROOT_DIR
rm /data/alpine-minirootfs.tar.gz

echo "[*] DNS configuration (resolv.conf)..."
echo "nameserver 8.8.8.8" > $CHROOT_DIR/etc/resolv.conf
echo "nameserver 1.1.1.1" >> $CHROOT_DIR/etc/resolv.conf

echo "[*] Performing initial mount..."
mount -o bind $CHROOT_DIR $CHROOT_DIR
mount -t proc proc $CHROOT_DIR/proc
mount -t sysfs sys $CHROOT_DIR/sys
mount -o bind /dev $CHROOT_DIR/dev
mount -t tmpfs tmpfs $CHROOT_DIR/run

echo "[*] Installing Docker, crun, iptables, and socat in chroot..."
chroot $CHROOT_DIR /bin/sh -c "export PATH=/bin:/usr/bin:/sbin:/usr/sbin:\$PATH && apk update && apk add docker iptables crun socat"

echo "[*] Installation complete!"
echo "Please use start-docker.sh to start the Docker daemon every time the device is rebooted."