Initial import

Containers/postgresql/Dockerfile

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+# From https://github.com/docker-library/postgres/blob/master/13/buster/Dockerfile
+FROM postgres:13-buster
+
+RUN set -ex; \
+    \
+    apt-get update; \
+    apt-get install -y --no-install-recommends \
+        openssl \
+    ; \
+    rm -rf /var/lib/apt/lists/*
+
+COPY start.sh /usr/bin/
+RUN chmod +x /usr/bin/start.sh
+
+RUN mkdir /mnt/data; \
+    chown postgres:postgres /mnt/data;
+
+VOLUME /mnt/data
+
+# Give root a random password
+RUN echo "root:$(openssl rand -base64 12)" | chpasswd
+
+USER postgres
+ENTRYPOINT ["start.sh"]

Containers/postgresql/start.sh

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+#!/bin/bash
+
+# Variables
+DATADIR="/var/lib/postgresql/data"
+DUMP_DIR="/mnt/data"
+DUMP_FILE="$DUMP_DIR/database-dump.sql"
+export PGPASSWORD="$POSTGRES_PASSWORD"
+
+# Don't start database as long as backup is running
+while [ -f "$DUMP_DIR/backup-is-running" ]; do
+    echo "Waiting for backup container to finish..."
+    sleep 10
+done
+
+# Check if dump dir is writeable
+if ! [ -w "$DUMP_DIR" ]; then
+    echo "DUMP dir is not writeable by postgres user."
+    exit 1
+fi
+
+# Test if some things match
+if ( [ -f "$DATADIR/PG_VERSION" ] && [ "$PG_MAJOR" != "$(cat "$DATADIR/PG_VERSION")" ] ) \
+|| ( ! [ -f "$DATADIR/PG_VERSION" ] && [ -f "$DUMP_FILE" ] ); then
+    # The DUMP_file must be provided
+    if ! [ -f "$DUMP_FILE" ]; then
+        echo "Unable to restore the database because the database dump is missing."
+        exit 1
+    fi
+
+    # Inform
+    echo "Restoring from database dump."
+
+    # Exit if any command fails
+    set -e
+
+    # Remove old database files
+    rm -rf "$DATADIR/"*
+
+    # Change database port to a random port temporarily
+    export PGPORT=11000
+
+    # Create new database
+    exec docker-entrypoint.sh postgres &
+
+    # Wait 2s for creation
+    sleep 2s
+
+    # Restore database
+    echo "Restoring the database from database dump"
+    psql "$POSTGRES_DB" -U "$POSTGRES_USER" < "$DUMP_FILE"
+
+    # Shut down the database to be able to start it again
+    pg_ctl stop -m fast
+
+    # Change database port back to default
+    export PGPORT=5432
+
+    # Don't exit if command fails anymore
+    set +e
+fi
+
+# Cover the last case
+if ! [ -f "$DATADIR/PG_VERSION" ] && ! [ -f "$DUMP_FILE" ]; then
+    # Remove old database files if somehow there should be some
+    rm -rf "$DATADIR/"*
+fi
+
+# Catch docker stop attempts
+trap 'true' SIGINT SIGTERM
+
+# Start the database
+exec docker-entrypoint.sh postgres &
+wait $!
+
+# Continue with shutdown procedure: do database dump, etc.
+rm -f "$DUMP_FILE.temp"
+if pg_dump --username "$POSTGRES_USER" "$POSTGRES_DB" > "$DUMP_FILE.temp"; then
+    rm -f "$DUMP_FILE"
+    mv "$DUMP_FILE.temp" "$DUMP_FILE"
+    pg_ctl stop -m fast
+    echo 'Database dump successful!'
+    exit 0
+else
+    pg_ctl stop -m fast
+    echo "Database dump unsucessful!"
+    exit 1
+fi