FROM ubuntu:22.04

RUN ! grep -E '^[^:]+:[^:]+:101:' /etc/passwd && \
    ! grep -E '^[^:]+:[^:]+:101:' /etc/group && \
    sed -e 's/^_apt:x:100:/_apt:x:101/' /etc/passwd > /tmp/passwd && \
    mv /tmp/passwd /etc/passwd
RUN groupadd --system smb --gid 101 && \
    useradd --system -M -g smb --uid 100 smbuser && \
    passwd -l smbuser
RUN apt-get update && \
    apt-get install -yy \
        --no-install-recommends \
        samba \
        samba-vfs-modules \
    && \
    rm -rf /var/lib/apt/lists/*

EXPOSE 137/udp 138/tcp 139 445

CMD ["smbd", "--foreground", "--debuglevel=1", "--debug-stdout", "--no-process-group"]