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FROM alpine:3.10 as build
# Allow container to expose ports at runtime, if necessary
# https://docs.docker.com/engine/reference/#expose
EXPOSE 25
EXPOSE 465
EXPOSE 587
# creates /opensmtpd dir and makes all following commands to run in it
# https://docs.docker.com/engine/reference/builder/#workdir
WORKDIR /opensmtpd
# 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
# 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
# Copy contentes of the repo inside the container
# https://docs.docker.com/engine/reference/builder/#copy
COPY . /opensmtpd
# build opensmtpd
RUN ./bootstrap \
&& ./configure \
--with-gnu-ld \
--sysconfdir=/etc/mail \
--with-auth-pam \
&& make \
&& make install \
&& cp etc/aliases /etc/mail/aliases
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