FROM alpine:edge

COPY files /
ARG DNSMASQ_UID=100
ARG DNSMASQ_GID=101
ARG user=dnsmasq
ARG capabilities=cap_net_raw,cap_net_bind_service
# Because Synology is dumb
ENV DNSMASQ_UID="${DNSMASQ_UID}"
ENV DNSMASQ_GID="${DNSMASQ_GID}"
ENV user="${user}"
ENV capabilities="${capabilities}"

RUN addgroup -g $DNSMASQ_GID -S $user
RUN adduser -u $DNSMASQ_UID -S -D -H -h /dev/null -s /sbin/nologin -G $user -g $user $user

RUN apk --no-cache add dnsmasq libcap
EXPOSE 53 53/udp

ENTRYPOINT ["/entrypoint.sh", "dnsmasq", "-k"]