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Usage

You want to use lefthook in your git project. Here is what you need:

  1. Create a lefthook.yml (or use any other supported name)
  2. Install lefthook git hooks

Then use git as usually, you don't need to reinstall lefthook when you change the config.

Commands

Lefthook is a CLI utility and it has several commands for convenience. You can check the usage via lefthook help or lefthook <command> -h/--help.

Here are the description of common usage of these commands.

lefthook install

Run lefthook install to initialize a lefthook.yml config and/or synchronize .git/hooks/ with your configuration. This must be the first thing you do after cloning the repo with lefthook.yml config. For config options see our configuration documentation.

If you use lefthook with NPM package manager it should have already run lefthook install in postinstall scripts.

lefthook uninstall

Run lefthook uninstall when you want to clear hooks .git/hooks/ related to lefthook.yml configuration. Use -f/--force flag to remove all git hooks.

Sometimes you feel like your git hooks are a mess and you want to start from the beginning. Use lefthook uninstall in this case.

lefthook add

Run lefthook add pre-commit, and lefthook will create a hook .git/hooks/pre-commit. This is the same lefthook does for install command but you don't need to create a configuration first.

If you want to use scripts you can simplify adding new scripts with lefthook add --dirs pre-commit.

Example

$ lefthook add --dirs pre-push

Describe pre-push commands in lefthook.yml:

pre-push:
  scripts:
    "audit.sh":
      runner: bash

Edit the script:

$ vim .lefthook/pre-push/audit.sh
...

That's all! Now on git push the audit.sh command will be run in bash interpreter. If it fails the git push will be interrupted.

lefthook run

This command is implicitly called in every git hook managed by lefthook. You can also use it for manual invoking some hooks handlers. You can also describe your own hooks that can be called manually only.

Example

# lefthook.yml

pre-commit:
  commands:
    lint:
      run: yarn lint --fix

test:
  commands:
    js-test:
      run: yarn test

Install the hook.

$ lefthook install

Run test.

$ lefthook run test # will run 'yarn test'

Commit changes.

$ git commit # will run pre-commit hook ('yarn lint --fix')

Or run manually also

$ lefthook run pre-commit

You can also specify a flag to run only some commands:

$ lefthook run pre-commit --commands lint

and optionally run either on all files (any {staged_files} placeholder acts as {all_files}) or a list of files:

$ lefthook run pre-commit --all-files
$ lefthook run pre-commit --file file1.js --file file2.js

(if both are specified, --all-files is ignored)

lefthook version

You can check version with lefthook version and you can also check the commit hash with lefthook version --full

Example

$ lefthook version --full

1.1.3 bb099d13c24114d2859815d9d23671a32932ffe2

Control behavior with ENV variables

LEFTHOOK

You can set ENV variable LEFTHOOK to 0 or false to disable lefthook.

Example

LEFTHOOK=0 git commit -am "Lefthook skipped"

LEFTHOOK_EXCLUDE

Use LEFTHOOK_EXCLUDE={list of tags or command names to be excluded} to skip some commands or scripts by tag or name (for commands only). See exclude_tags config option for more details.

Example

LEFTHOOK_EXCLUDE=ruby,security,lint git commit -am "Skip some tag checks"

LEFTHOOK_QUIET

You can skip some output printed by lefthook with LEFTHOOK_QUIET ENV variable. Just provide a list of output types. See skip_output config option for more details.

Example

$ LEFTHOOK_QUIET=meta,execution lefthook run pre-commit

  EXECUTE > lint

SUMMARY: (done in 0.01 seconds)
🥊  lint

LEFTHOOK_VERBOSE

Set LEFTHOOK_VERBOSE=1 or LEFTHOOK_VERBOSE=true to enable verbose printing.

LEFTHOOK_BIN

Set LEFTHOOK_BIN to a location where lefthook is installed to use that instead of trying to detect from the it the PATH or from a package manager.

Useful for cases when:

  • lefthook is installed multiple ways, and you want to be explicit about which one is used (example: installed through homebrew, but also is in Gemfile but you are using a ruby version manager like rbenv that prepends it to the path)
  • debugging and/or developing lefthook

Features and tips

Disable lefthook in CI

Add CI=true env variable if it doesn't exists on your service by default. Otherwise, if you use lefthook NPM package it will try running lefthook install in postinstall scripts.

Local config

We can use lefthook-local.yml as local config. Options in this file will overwrite options in lefthook.yml. (Don't forget to add this file to .gitignore)

Commitlint example

Let's create a bash script to check conventional commit status .lefthook/commit-msg/commitlint.sh:

echo $(head -n1 $1) | npx commitlint --color

Now we can ask lefthook to run our bash script by adding this code to lefthook.yml file:

# lefthook.yml

commit-msg:
  scripts:
    "commitlint.sh":
      runner: bash

When you try to commit git commit -m "haha bad commit text" script commitlint.sh will be executed. Since commit text doesn't match the default config or custom config that you setup for commitlint, the process will be interrupted.

Parallel execution

You can enable parallel execution if you want to speed up your checks. Lets imagine we have the following rules to lint the whole project:

bundle exec rubocop --parallel && \
bundle exec danger && \
yarn eslint --ext .es6 app/assets/javascripts && \
yarn eslint --ext .es6 test/javascripts && \
yarn eslint --ext .es6 plugins/**/assets/javascripts && \
yarn eslint --ext .es6 plugins/**/test/javascripts && \
yarn eslint app/assets/javascripts test/javascripts

Rewrite it in lefthook custom group. We call it lint:

# lefthook.yml

lint:
  parallel: true
  commands:
    rubocop:
      run: bundle exec rubocop --parallel
    danger:
      run: bundle exec danger
    eslint-assets:
      run: yarn eslint --ext .es6 app/assets/javascripts
    eslint-test:
      run: yarn eslint --ext .es6 test/javascripts
    eslint-plugins-assets:
      run: yarn eslint --ext .es6 plugins/**/assets/javascripts
    eslint-plugins-test:
      run: yarn eslint --ext .es6 plugins/**/test/javascripts
    eslint-assets-tests:
      run: yarn eslint app/assets/javascripts test/javascripts

Then call this group directly:

lefthook run lint

Concurrent files overrides

To prevent concurrent problems with read/write files try flock utility.

# lefthook.yml

graphql-schema:
  glob: "{Gemfile.lock,app/graphql/**/*}"
  run: flock webpack/application/typings/graphql-schema.json yarn typings:update && git diff --exit-code --stat HEAD webpack/application/typings
frontend-tests:
  glob: "**/*.js"
  run: flock -s webpack/application/typings/graphql-schema.json yarn test --findRelatedTests {files}
frontend-typings:
  glob: "**/*.js"
  run: flock -s webpack/application/typings/graphql-schema.json yarn run flow focus-check {files}

Capture ARGS from git in the script

Example script for prepare-commit-msg hook:

COMMIT_MSG_FILE=$1
COMMIT_SOURCE=$2
SHA1=$3

# ...

Git LFS support

⚠️ If git-lfs binary is not installed and not required in your project, LFS hooks won't be executed, and you won't be warned about it.

Lefthook runs LFS hooks internally for the following hooks:

  • post-checkout
  • post-commit
  • post-merge
  • pre-push

Errors are suppressed if git LFS is not required for the project. You can use LEFTHOOK_VERBOSE ENV to make lefthook show git LFS output.

Pass stdin to a command or script

When you need to read the data from stdin – specify use_stdin: true. This option is good when you write a command or script that receives data from git using stdin (for the pre-push hook, for example).

Using an interactive command or script

When you need to interact with user – specify interactive: true. Lefthook will connect to the current TTY and forward it to your command's or script's stdin.