#!/bin/bash
set -e

uid=${UID?}
gid=${GID?}
user=${USER:-"build"}
export HOME="/home/${user}"
[ ! -z "$PATH_PREFIX" ] && \
    export PATH="${PATH_PREFIX}:${PATH}"

# If running user is not root, pivot to custom user/group
if [ "$uid" != "0" ]; then
    getent group "$gid" \
        && groupdel "$(awk -v i="$gid" -F: '$3 == i' /etc/group | cut -d: -f1)"
    getent passwd "$uid" \
        && userdel "$(awk -v i="$uid" -F: '$3 == i' /etc/passwd | cut -d: -f1)"
    groupadd -g "$gid" "${user}"
    useradd \
        -g "$gid" \
        -G sudo \
        -u "$uid" \
        -d "/home/${user}" \
        -s /bin/bash \
    "${user}"
    setpriv --reuid="$uid" --regid="$gid" --init-groups "$@"
else
    exec "$@"
fi