From 47c0ddbc33a38cf36b4eb65c4814f2d382e8f237 Mon Sep 17 00:00:00 2001
From: Tianon Gravi <admwiggin@gmail.com>
Date: Mon, 13 Jun 2016 14:39:08 -0700
Subject: [PATCH] Add "postgres"

---
 postgres/Dockerfile         |  5 +++++
 postgres/docker-healthcheck | 21 +++++++++++++++++++++
 2 files changed, 26 insertions(+)
 create mode 100644 postgres/Dockerfile
 create mode 100755 postgres/docker-healthcheck

diff --git a/postgres/Dockerfile b/postgres/Dockerfile
new file mode 100644
index 0000000..eb77747
--- /dev/null
+++ b/postgres/Dockerfile
@@ -0,0 +1,5 @@
+FROM postgres
+
+COPY docker-healthcheck /usr/local/bin/
+
+HEALTHCHECK CMD ["docker-healthcheck"]
diff --git a/postgres/docker-healthcheck b/postgres/docker-healthcheck
new file mode 100755
index 0000000..06a11b0
--- /dev/null
+++ b/postgres/docker-healthcheck
@@ -0,0 +1,21 @@
+#!/bin/bash
+set -eo pipefail
+
+user="${POSTGRES_USER:-postgres}"
+
+export PGPASSWORD="${POSTGRES_PASSWORD:-}"
+
+args=(
+	# force postgres to not use the local unix socket (test "external" connectibility)
+	--host "$(hostname --ip-address || echo '127.0.0.1')"
+	--username "$user"
+	--quiet --no-align --tuples-only
+)
+
+if select="$(echo 'SELECT 1' | psql "${args[@]}")" && [ "$select" = '1' ]; then
+	exit 0
+fi
+
+# If the probe returns 2 ("starting") when the container has already moved out of the "starting" state then it is treated as "unhealthy" instead.
+# https://github.com/docker/docker/blob/dcc65376bac8e73bb5930fce4cddc2350bb7baa2/docs/reference/builder.md#healthcheck
+exit 2