#!/bin/bash
set -e

uid=${UID?}
gid=${GID?}
user=${USER:-"build"}
export HOME="/home/${user}"

# If running user is not root, pivot to custom user/group
[ "$uid" != "0" ] && {
    getent group "$gid" && groupdel "$gid"
    getent passwd "$uid" && userdel "$uid"
    groupadd -g "$gid" "${user}"
    useradd \
        -g "$gid" \
        -G sudo \
        -u "$uid" \
        -d "/home/${user}" \
        -s /bin/bash \
        "${user}"
    setpriv --reuid="$uid" --regid="$gid" --init-groups "$@"
}

exec "$@"