Docker image for pg_upgrade 10 -> 11 with PostGIS 2.5

docker-upgrade

#!/bin/bash
set -e

if [ "$#" -eq 0 -o "${1:0:1}" = '-' ]; then
	set -- pg_upgrade "$@"
fi

if [ "$1" = 'pg_upgrade' -a "$(id -u)" = '0' ]; then
	mkdir -p "$PGDATAOLD" "$PGDATANEW"
	chmod 700 "$PGDATAOLD" "$PGDATANEW"
	chown postgres .
	chown -R postgres "$PGDATAOLD" "$PGDATANEW"
	exec gosu postgres "$BASH_SOURCE" "$@"
fi

if [ "$1" = 'pg_upgrade' ]; then
	if [ ! -s "$PGDATANEW/PG_VERSION" ]; then
		PGDATA="$PGDATANEW" eval "initdb $POSTGRES_INITDB_ARGS"
	fi
fi

exec "$@"

Dockerfile

FROM mdillon/postgis:11

RUN sed -i 's/$/ 10/' /etc/apt/sources.list.d/pgdg.list

RUN apt-get update && apt-get install -y --no-install-recommends \
		postgresql-10 postgresql-10-postgis-2.5 postgresql-10-postgis-2.5-scripts \
	&& rm -rf /var/lib/apt/lists/*

ENV PGBINOLD /usr/lib/postgresql/10/bin
ENV PGBINNEW /usr/lib/postgresql/11/bin

ENV PGDATAOLD /var/lib/postgresql/10/data
ENV PGDATANEW /var/lib/postgresql/11/data

RUN mkdir -p "$PGDATAOLD" "$PGDATANEW" \
	&& chown -R postgres:postgres /var/lib/postgresql

WORKDIR /var/lib/postgresql

COPY docker-upgrade /usr/local/bin/

ENTRYPOINT ["docker-upgrade"]

# recommended: --link
CMD ["pg_upgrade"]