Add Wal-E backup support

db/Dockerfile

@@ -1,3 +1,18 @@
 FROM postgres:9.4
- 
+
+RUN apt-get update \
+    && apt-get install -y python-dev lzop pv daemontools curl build-essential \
+    && curl --silent --show-error --retry 5 https://bootstrap.pypa.io/get-pip.py | python \
+    && pip install wal-e \
+    && apt-get remove -y build-essential python-dev \
+    && apt-get autoremove -y \
+    && apt-get clean \
+    && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
+
 ADD make_db.sh /docker-entrypoint-initdb.d/
+ADD setup-wale.sh /docker-entrypoint-initdb.d/
+COPY docker-entrypoint1.sh /
+
+ENTRYPOINT ["/docker-entrypoint1.sh"]
+
+CMD ["postgres"]

db/docker-entrypoint1.sh

@@ -0,0 +1,29 @@
+#!/bin/bash
+
+if [ "${1:0:1}" = '-'  ]; then
+    set -- postgres "$@"
+fi
+
+if [ "$1" = 'postgres'  ]; then
+    VARS=(AWS_ACCESS_KEY_ID AWS_SECRET_ACCESS_KEY WALE_S3_PREFIX AWS_REGION)
+
+    for v in ${VARS[@]}; do
+        if [ "${!v}" = "" ]; then
+            echo "$v is required for Wal-E but not set. Skipping Wal-E setup."
+            . /docker-entrypoint.sh
+            exit
+        fi
+    done
+
+    umask u=rwx,g=rx,o=
+    mkdir -p /etc/wal-e.d/env
+
+    for v in ${VARS[@]}; do
+        echo "${!v}" > /etc/wal-e.d/env/$v
+    done
+    chown -R root:postgres /etc/wal-e.d
+
+    . /docker-entrypoint.sh
+fi
+
+exec "$@"

db/setup-wale.sh

@@ -0,0 +1,11 @@
+#!/bin/bash
+
+# wal-e specific
+echo "wal_level = archive" >> /var/lib/postgresql/data/postgresql.conf
+echo "archive_mode = on" >> /var/lib/postgresql/data/postgresql.conf
+echo "archive_command = 'envdir /etc/wal-e.d/env /usr/local/bin/wal-e wal-push %p'" >> /var/lib/postgresql/data/postgresql.conf
+echo "archive_timeout = 60" >> /var/lib/postgresql/data/postgresql.conf
+
+# no cron in the image, use systemd timer on host instead
+#su - postgres -c "crontab -l | { cat; echo \"0 3 * * * /usr/bin/envdir /etc/wal-e.d/env /usr/local/bin/wal-e backup-push /var/lib/postgresql/data\"; } | crontab -"
+#su - postgres -c "crontab -l | { cat; echo \"0 4 * * * /usr/bin/envdir /etc/wal-e.d/env /usr/local/bin/wal-e delete --confirm retain 7\"; } | crontab -"