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Usage

Commands

Use lefthook help or lefthook <command> -h/--help to discover available commands and their options.

lefthook install

lefthook install creates an empty lefthook.yml if a configuration file does not exist and updates git hooks to use lefthook. Run lefthook install after cloning the git repo.

Note

NPM package lefthook installs the hooks in a postinstall script automatically.

lefthook uninstall

lefthook uninstall clears git hooks affected by lefthook.

lefthook add

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

To use custom scripts as hooks create the required directories with lefthook add pre-commit --dirs.

Example

$ lefthook add pre-push --dirs

Describe pre-push commands in lefthook.yml:

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

Edit the script:

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

Run git push and lefthook will run bash audit.sh as a pre-push hook.

lefthook run

lefthook run executes the commands and scripts configured for a given hook. Generated hooks call lefthook run implicitly.

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

lefthook version prints the current binary version. Print the commit hash with lefthook version --full

Example

$ lefthook version --full

1.1.3 bb099d13c24114d2859815d9d23671a32932ffe2

lefthook self-update

lefthook self-update updates the binary with the latest lefthook release on Github. This command is available only if you install lefthook from sources or download the binary from the Github Releases. For other ways use package-specific commands to update lefthook.

ENV variables

LEFTHOOK

Use LEFTHOOK=0 git ... or LEFTHOOK=false git ... to disable lefthook when running git commands.

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 the exclude_tags configuration option for more details.

Example

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

LEFTHOOK_OUTPUT

Use LEFTHOOK_OUTPUT={list of output values} to specify what to print in your output. You can also set LEFTHOOK_OUTPUT=false to disable all output except for errors. Refer to the output configuration option for more details.

Example

$ LEFTHOOK_OUTPUT=summary lefthook run pre-commit
summary: (done in 0.52 seconds)
✔️  lint

LEFTHOOK_QUIET

You can skip some outputs printed by lefthook by setting the LEFTHOOK_QUIET environment variable. Provide a list of output types to be skipped. See the skip_output configuration 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

NO_COLOR

Set NO_COLOR=true to disable colored output in lefthook and all subcommands that lefthook calls.

CLICOLOR_FORCE

Set CLICOLOR_FORCE=true to force colored output in lefthook and all subcommands.

Tips

Local config

Use lefthook-local.yml to overwrite or extend options from the main config. (Don't forget to add this file to .gitignore)

Disable lefthook in CI

When using NPM package lefthook set CI=true in your CI (if it does not set automatically). When CI=true is set lefthook NPM package won't install the hooks in the postinstall script.

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.