FROM alpine
LABEL Maintainer="Memiks <contact@memiks.fr>" \
      Description="Lightweight container with OpenSMTPD on Alpine Linux."

# Allow container to expose ports at runtime, if necessary
# https://docs.docker.com/engine/reference/#expose
EXPOSE 25
EXPOSE 465
EXPOSE 587

# install necessary packages
RUN apk add --no-cache \
    autoconf \
    automake \
    bison \
    ca-certificates \
    fts-dev \
    gcc \
    fts \
    libasr-dev \
    libevent-dev \
    libtool \
    libtool \
    linux-pam-dev \
    make \
    musl-dev \
    openssl \
    openssl-dev \
    zlib-dev \
    git
 
# create users and directories
# note: alpine uses busybox and useradd is not available there
# also long flags are not available too, so sorry for the 
RUN mkdir -p /var/lib/opensmtpd/empty \
  && adduser _smtpd -h /var/lib/opensmtpd/empty/ -D -H -s /bin/false \
  && adduser _smtpq -h /var/lib/opensmtpd/empty/ -D -H -s /bin/false \
  && mkdir -p /var/spool/smtpd \
  && mkdir -p /var/mail \
  && mkdir -p /etc/mail \
  && chmod 711 /var/spool/smtpd

WORKDIR /tmp
RUN git clone -b portable git://github.com/OpenSMTPD/OpenSMTPD.git opensmtpd

WORKDIR /tmp/opensmtpd
RUN ./bootstrap \
  && ./configure \
  --prefix=/usr \
  --sbindir=/usr/bin \
  --libexecdir=/usr/lib/smtpd \
  --sysconfdir=/etc/smtpd \
  --with-user-smtpd=smtpd \
  --with-user-queue=smtpq \
  --with-group-queue=smtpq \
  --with-gnu-ld \
  --with-auth-pam

RUN make && make install
#RUN etc/aliases /etc/mail/aliases

RUN addgroup smtpq
RUN adduser -D -S -G smtpq smtpq
RUN addgroup smtpd
RUN adduser -D -S -G smtpd smtpd

USER smtpd

WORKDIR /etc/smtpd

# Override shell for bash-y debugging goodness
SHELL ["/bin/bash", "-exc"]