FROM alpine:3.8
LABEL maintainer="Disassembler <disassembler@dasm.cz>"

RUN \
 # Modify OS user (which will be picked up later by apk add)
 sed -i 's/postgres:x:70:70/postgres:x:5432:5432/' /etc/passwd \
 && sed -i 's/postgres:x:70/postgres:x:5432/' /etc/group \
 # Add edge/testing repository for postgis support
 && echo '@edge http://dl-cdn.alpinelinux.org/alpine/edge/testing' >>/etc/apk/repositories \
  # Install PostgreSQL + PostGIS
 && apk --no-cache add postgresql postgresql-contrib postgis@edge \
 # Create socket directory 
 && mkdir /run/postgresql \
 && chown postgres:postgres /run/postgresql

VOLUME ["/var/lib/postgresql"]
EXPOSE 5432

USER postgres
CMD ["postgres", "-D", "/var/lib/postgresql"]