#!/usr/bin/env bash
OPTIND=1
UNSHARED=false
while getopts ":U" opt; do
    case "$opt" in
        U)
            UNSHARED=true
            ;;
        *) ;;

    esac
done

shift $((OPTIND - 1))
if [ ! "$UNSHARED" == "true" ]; then
    user="$(whoami)"
    vars=""
    vars+=" HOME=$HOME"
    vars+=" PATH=$PREFIX/bin"
    vars+=" PREFIX=$PREFIX"
    vars+=" TMPDIR=$TMPDIR"
    vars+=" SHELL=$PREFIX/bin/login"
    vars+=" exec $PREFIX/bin/login"
    args=""
    if [ -n "$1" ]; then
        args="-c '$@'"
    fi
    $PREFIX/bin/sudo unshare -m $0 -U "$user" "$HOME" "$vars $args"
else
    mount --bind /data/data/com.termux /data/data/com.termux
    user="$1"
    user_home="$2"
    vars="$3"
    cd $user_home
    groups=${user},inet,everybody,${user}_cache,all_$(echo $user | cut -d "_" -f 2)
    exec chroot --skip-chdir --userspec=$user:$user --groups=$groups / sh -c "$vars"
fi