Add hadolint

.pre-commit-hooks.yaml

@@ -1,6 +1,19 @@
+---
 - id: docker-compose-check
   name: Validate docker-compose files
-  description: Checks that vault files are encrypted
+  description: Checks that docker-compose files are valid
+  language: script
   entry: compose-check.sh
   files: docker-compose.y[a]{0,1}ml$
-  language: script
+- id: hadolint
+  name: Lint Dockerfiles
+  description: Runs hadolint Docker image to lint Dockerfiles
+  language: docker_image
+  entry: hadolint/hadolint hadolint
+  files: Dockerfile
+- id: hadolint-system
+  name: Lint Dockerfiles
+  description: Runs system hadolint to lint Dockerfiles
+  language: system
+  entry: hadolint
+  files: Dockerfile

README.md

@@ -6,3 +6,9 @@ A set of [pre-commit](http://pre-commit.com) hooks for Docker services
 
 ### docker-compose-check
 Verifies that docker-compose files are valid by using `docker-compose config` to parse them.
+
+### hadolint
+Uses the [hadolint Docker image](https://hub.docker.com/hadolint/hadolint) to lint Dockerfiles.
+
+### hadolint-system
+Uses the whatever version of hadolint that you have installed to lint Dockerfiles. This requires you to have hadolint installed somewhere in your path.

hooks.yaml

@@ -1,7 +0,0 @@
----
-- id: docker-compose-check
-  name: Validate docker-compose files
-  description: Checks that docker-compose files are valid
-  entry: compose-check.sh
-  files: docker-compose.y[a]{0,1}ml$
-  language: script