Adjust entrypoint to always warn on missing socket

Also chmod the entrypoint

Dockerfile

@@ -31,4 +31,4 @@ ENV DOCKER_HOST unix:///tmp/docker.sock
 VOLUME ["/etc/nginx/certs"]
 
 ENTRYPOINT ["/app/docker-entrypoint.sh"]
-CMD ["nginx-proxy"]
+CMD ["forego", "start", "-r"]

docker-entrypoint.sh

@@ -1,29 +1,22 @@
 #!/bin/bash
 set -e
 
-check_unix_socket() {
+# Warn if the DOCKER_HOST socket does not exist
 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
+			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
+			See the documentation at http://git.io/vZaGJ
 		EOT
+		socketMissing=1
+	fi
+fi
+
+# If the user has run the default command and the socket doesn't exist, fail
+if [ "$socketMissing" = 1 -a "$1" = forego -a "$2" = start -a "$3" = '-r' ]; then
 	exit 1
 fi
-	fi
-}
 
-################################################################################
-
-# check for the expected command
-if [ "$1" = 'nginx-proxy' ]; then
-	check_unix_socket
-	exec forego start -r
-fi
-
-# else default to run whatever the user wanted like "bash"
 exec "$@"
-
-