From d83ba3da1ede656c07b79d85731d81dffcf5f0f2 Mon Sep 17 00:00:00 2001
From: Thomas LEVEIL <thomasleveil@gmail.com>
Date: Fri, 11 Sep 2015 22:05:54 +0000
Subject: [PATCH] refuse to start if the docker sock isn't available

---
 Dockerfile           |  2 +-
 docker-entrypoint.sh | 16 ++++++++++++++++
 2 files changed, 17 insertions(+), 1 deletion(-)
 create mode 100644 docker-entrypoint.sh

diff --git a/Dockerfile b/Dockerfile
index abfae74..d4b3e0b 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -30,4 +30,4 @@ ENV DOCKER_HOST unix:///tmp/docker.sock
 
 VOLUME ["/etc/nginx/certs"]
 
-CMD ["forego", "start", "-r"]
+ENTRYPOINT ["/app/docker-entrypoint.sh"]
diff --git a/docker-entrypoint.sh b/docker-entrypoint.sh
new file mode 100644
index 0000000..2ce3833
--- /dev/null
+++ b/docker-entrypoint.sh
@@ -0,0 +1,16 @@
+#!/bin/bash
+set -e
+
+if [[ $DOCKER_HOST == unix://* ]]; then
+	socket_file=${DOCKER_HOST#unix://}
+	if ! [ -S $socket_file ]; then
+		cat >&2 <<-EOT
+			ERROR: you need to share your docker host socket with a volume at $socket_file
+			Typically you should run your jwilder/nginx-proxy with: \`-v /var/run/docker.sock:$socket_file:ro\`
+			See documentation at http://git.io/vZaGJ
+		EOT
+		exit 1
+	fi
+fi
+
+exec forego start -r
\ No newline at end of file