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.pre-commit-hooks.yml

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+- id: circleci-config-validate
+  name: CircleCI config validator
+  description: Validates CircleCI configuration files locally
+  entry: hooks/circleci-config-validate.sh
+  language: [script]
+  files: ^.circleci/config.ya?ml$

LICENSE

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+The MIT License (MIT)
+
+Copyright (c) Chase Pierce <[email protected]>
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.

README.md

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+# git-hooks
+
+[pre-commit]: http://pre-commit.com/
+
+A collection of useful Git hooks for integration with [pre-commit][].
+
+## Usage
+
+Create or append to your `.pre-commit-config.yml` configuration:
+
+```yaml
+- repo: https://github.com/syntaqx/git-hooks
+  hooks:
+    - id: circleci-config-validate
+```
+
+Then simply install or run the checks on-demand as desired.
+
+## License
+
+[MIT]: https://opensource.org/licenses/MIT
+
+`git-hooks` is open source software released under the [MIT license][MIT].

hooks/circleci-config-validate.sh

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+#!/usr/bin/env bash
+
+# Test if the CircleCI config file is well formed via the circleci local cli.
+# https://circleci.com/docs/2.0/local-cli/
+# https://circleci.com/blog/circleci-hacks-validate-circleci-config-on-every-commit-with-a-git-hook/
+
+set -o errexit
+set -o pipefail
+set -o nounset
+
+readonly DEBUG=${DEBUG:-unset}
+[[ $DEBUG != unset ]] && set -x
+
+# assert the circleci command exists
+if ! [ -x "$(command -v circleci)" ]; then
+    echo 'circleci command not found'
+    echo 'See https://circleci.com/docs/2.0/local-cli/ for installation instructions.'
+    exit 1
+fi
+
+# The following is needed by the circleci local build tool (due to Docker interactivity)
+exec < /dev/tty
+
+# If validation fails, tell Git to stop and provide error message. Otherwise, continue.
+if ! msg=$(circleci config validate); then
+	echo "CircleCI Configuration Failed Validation."
+	echo "$msg"
+	exit 1
+fi