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https://github.com/sds/overcommit

A fully configurable and extendable Git hook manager
https://github.com/sds/overcommit
Last synced: 7 days ago
JSON representation
A fully configurable and extendable Git hook manager
Host: GitHub
URL: https://github.com/sds/overcommit
Owner: sds
License: mit
Created: 2011-03-24T09:56:15.000Z (over 13 years ago)
Default Branch: main
Last Pushed: 2024-08-11T06:37:24.000Z (3 months ago)
Last Synced: 2024-10-22T16:45:02.548Z (13 days ago)
Language: Ruby
Homepage:
Size: 2.86 MB
Stars: 3,920
Watchers: 88
Forks: 279
Open Issues: 31
Metadata Files:
- Readme: README.md
- Changelog: CHANGELOG.md
- Contributing: CONTRIBUTING.md
- License: MIT-LICENSE
Awesome Lists containing this project

awesome-ruby - Overcommit - A fully configurable and extendable Git hook manager. (Git Tools)
awesome-git-hooks - Overcommit - A fully configurable and extendable git hook manager. (Tools / update)
awesome-ruby-cli-apps - overcommit - Automates management and configuration of [Git hooks](https://git-scm.com/book/en/v2/Customizing-Git-Git-Hooks). (Awesome Ruby CLIs / Automation)
my-awesome - sds/overcommit - 08 star:3.9k fork:0.3k A fully configurable and extendable Git hook manager (Ruby)
README

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[![Inline docs](http://inch-ci.org/github/sds/overcommit.svg?branch=main)](http://inch-ci.org/github/sds/overcommit)



  



`overcommit` is a tool to manage and configure

[Git hooks](http://git-scm.com/book/en/Customizing-Git-Git-Hooks).

In addition to supporting a wide variety of hooks that can be used across

multiple repositories, you can also define hooks specific to a repository which

are stored in source control. You can also easily

[add your existing hook scripts](#adding-existing-git-hooks) without writing

any Ruby code.

- [Requirements](#requirements)

  - [Windows](#windows)

  - [Dependencies](#dependencies)

- [Installation](#installation)

  - [Automatically Install Overcommit Hooks](#automatically-install-overcommit-hooks)

- [Usage](#usage)

  - [Skipping Hooks](#skipping-hooks)

  - [Disabling Overcommit](#disabling-overcommit)

  - [Disabling Colorized Output](#disabling-colorized-output)

- [Continuous Integration](#continuous-integration)

- [Configuration](#configuration)

  - [Hook Options](#hook-options)

  - [Hook Categories](#hook-categories)

    - [The `ALL` Hook](#the-all-hook)

  - [Gemfile](#gemfile)

  - [Plugin Directory](#plugin-directory)

  - [Quiet Hook Runs](#quiet-hook-runs)

  - [Concurrency](#concurrency)

  - [Signature Verification](#signature-verification)

- [Built-In Hooks](#built-in-hooks)

  - [CommitMsg](#commitmsg)

  - [PostCheckout](#postcheckout)

  - [PostCommit](#postcommit)

  - [PostMerge](#postmerge)

  - [PostRewrite](#postrewrite)

  - [PreCommit](#precommit)

    - [WARNING: pre-commit hooks cannot have side effects](#warning-pre-commit-hooks-cannot-have-side-effects)

  - [PrePush](#prepush)

  - [PreRebase](#prerebase)

- [Repo-Specific hooks](#repo-specific-hooks)

  - [Adding Existing Git Hooks](#adding-existing-git-hooks)

- [Security](#security)

  - [Disabling Signature Checking](#disabling-signature-checking)

- [Contributing](#contributing)

- [Community](#community)

- [Changelog](#changelog)

- [License](#license)

## Requirements

This project aims to support the following Ruby runtimes on \*nix (and best effort on Windows):

* Ruby 2.6+

### Dependencies

Some hooks have third-party dependencies. For example, to lint your

[SCSS](http://sass-lang.com/) files, you're going to need the

[scss_lint gem](https://github.com/sds/scss-lint).

Depending on the hooks you enable/disable for your repository, you'll need to

ensure your development environment already has those dependencies installed.

Most hooks will display a warning if a required executable isn't available.

If you are using Bundler to manage your Ruby gem dependencies, you'll likely

want to use the [`gemfile`](#gemfile) option to control which gem versions are

available during your hook runs.

## Installation

`overcommit` is installed via [RubyGems](https://rubygems.org/). It is strongly

recommended that your environment support running `gem install` without

requiring root user privileges via `sudo` or otherwise. Using a Ruby version

manager like [`rbenv`](https://github.com/rbenv/rbenv/) or

[`rvm`](https://rvm.io/) is recommended.

Once you have an environment that allows you to install gems without `sudo`,

run:

```bash

gem install overcommit

```

You can then run the `overcommit` command to install hooks into repositories.

```bash

mkdir important-project

cd important-project

git init

overcommit --install

```

After running `overcommit --install`, any existing hooks for your repository

which Overcommit will replace will be backed up. You can restore everything to

the way it was by running `overcommit --uninstall`.

### Automatically Install Overcommit Hooks

If you want to use `overcommit` for all repositories you create/clone going

forward, add the following to automatically run in your shell environment:

```bash

export GIT_TEMPLATE_DIR="$(overcommit --template-dir)"

```

The `GIT_TEMPLATE_DIR` provides a directory for Git to use as a template

for automatically populating the `.git` directory. If you have your own

template directory, you might just want to copy the contents of

`overcommit --template-dir` to that directory.

## Usage

Once you've installed the hooks via `overcommit --install`, they will

automatically run when the appropriate hook is triggered.

The `overcommit` executable supports the following command-line flags:

Command Line Flag         | Description

--------------------------|----------------------------------------------------

`-i`/`--install`          | Install Overcommit hooks in a repository

`-u`/`--uninstall`        | Remove Overcommit hooks from a repository

`-f`/`--force`            | Don't bail on install if other hooks already exist--overwrite them

`-l`/`--list-hooks`       | Display all available hooks in the current repository

`-r`/`--run`              | Run pre-commit hook against all tracked files in repository

`-t`/`--template-dir`     | Print location of template directory

`-h`/`--help`             | Show command-line flag documentation

`-v`/`--version`          | Show version

### Skipping Hooks

Sometimes a hook will report an error that for one reason or another you'll want

to ignore. To prevent these errors from blocking your commit, you can include

the name of the relevant hook in the `SKIP` environment variable, e.g.

```bash

SKIP=RuboCop git commit

```

If you would prefer to specify a whitelist of hooks rather than a blacklist, use

the `ONLY` environment variable instead.

```bash

ONLY=RuboCop git commit

```

Use this feature sparingly, as there is no point to having the hook in the first

place if you're just going to ignore it. If you want to ensure a hook is never

skipped, set the `required` option to `true` in its configuration. If you

attempt to skip it, you'll see a warning telling you that the hook is required,

and the hook will still run.

### Disabling Overcommit

If you have scripts that execute `git` commands where you don't want Overcommit

hooks to run, you can disable Overcommit entirely by setting the

`OVERCOMMIT_DISABLE` environment variable.

```bash

OVERCOMMIT_DISABLE=1 ./my-custom-script

```

### Disabling Colorized Output

Overcommit automatically colorizes its output based on whether it is outputting

to a TTY. However, you can manually enable/disable color by setting the

`OVERCOMMIT_COLOR` environment variable.

```bash

OVERCOMMIT_COLOR=0 git commit

```

## Continuous Integration

You can run the same set of hooks that would be executed in a pre-commit hook

against your entire repository by running `overcommit --run`. This makes it

easy to have the checks verified by a CI service such as

[Travis CI](https://travis-ci.com/), including custom hooks you've written

yourself.

The `--run` flag works by creating a pre-commit context that assumes _all_ the

files in your repository have changed, and follows the same rules as a normal

pre-commit check. If any hook fails with an error, it will return a non-zero

exit code.

## Configuration

Overcommit provides a flexible configuration system that allows you to tailor

the built-in hooks to suit your workflow. All configuration specific to a

repository is stored in `.overcommit.yml` in the top-level directory of the

repository.

When writing your own configuration, it will automatically extend the

[default configuration](config/default.yml), so you only need to specify

your configuration with respect to the default. In order to

enable/disable hooks, you can add the following to your repo-specific

configuration file:

```yaml

PreCommit:

  RuboCop:

    enabled: true

    command: ['bundle', 'exec', 'rubocop'] # Invoke within Bundler context

```

Additionally, you may wish to have repo-specific configurations that are local to your computer that are not part of the shared repo config.

Adding a `.local-overcommit.yml` file in the top-level directory of the repository adds another configuration file. This file works the same as `.overcommit.yml`.

Adding this to ignored files in a git repo will allow you to have a local configuration per repo.

### Hook Options

Individual hooks expose both built-in configuration options as well as their

own custom options unique to each hook. The following table lists all built-in

configuration options:

Option                                  | Description

----------------------------------------|--------------------------------------

`enabled`                               | If `false`, this hook will never be run

`required`                              | If `true`, this hook cannot be skipped via the `SKIP` environment variable

`quiet`                                 | If `true`, this hook does not display any output unless it warns/fails

`description`                           | Message displayed while hook is running.

`requires_files`                        | If `true`, this hook runs only if files that are applicable to it have been modified. See `include` and `exclude` for how to specify applicable files.

`include`                               | File paths or glob patterns of files that apply to this hook. The hook will only run on the applicable files when they have been modified. Note that the concept of modified varies for different types of hooks. By default, `include` matches every file until you specify a list of patterns.

`exclude`                               | File paths or glob patterns of files that do not apply to this hook. This is used to exclude any files that would have been matched by `include`.

`exclude_branches`                      | List of branch names or glob patterns of branches that this hook should not run against.

`exclude_remotes`                       | *`PrePush` hooks only.* List of remote names that the hook should not run against.

`include_remote_ref_deletions`          | *`PrePush` hooks only.* By default, `PrePush` hooks will **not** run for pushes that delete a remote ref (i.e. branches or tags). Set to `true` to have the hook run even for deleted remote ref.

`problem_on_unmodified_line`            | How to treat errors reported on lines that weren't modified during the action captured by this hook (e.g. for pre-commit hooks, warnings/errors reported on lines that were not staged with `git add` may not be warnings/errors you care about). Valid values are `report`: report errors/warnings as-is regardless of line location (default); `warn`: report errors as warnings if they are on lines you didn't modify; and `ignore`: don't display errors/warnings at all if they are on lines you didn't modify (`ignore` is _not_ recommended).

`on_fail`                               | Change the status of a failed hook to `warn` or `pass`. This allows you to treat failures as warnings or potentially ignore them entirely, but you should use caution when doing so as you might be hiding important information.

`on_warn`                               | Similar to `on_fail`, change the status of a hook that returns a warning status to either `pass` (you wish to silence warnings entirely) or `fail` (you wish to treat all warnings as errors).

`required_executable`                   | Name of an executable that must exist in order for the hook to run. If this is a path (e.g. `./bin/ruby`), ensures that the executable file exists at the given location relative to the repository root. Otherwise, if it just the name of an executable (e.g. `ruby`) checks if the executable can be found in one of the directories in the `PATH` environment variable. Set this to a specific path if you want to always use an executable that is stored in your repository. (e.g. RubyGems bin stubs, Node.js binaries, etc.)

`required_library`/`required_libraries` | List of Ruby libraries to load with `Kernel.require` before the hook runs. This is specifically for hooks that integrate with external Ruby libraries.

`command`                               | Array of arguments to use as the command. How each hook uses this is different, but it allows hooks to change the context with which they run. For example, you can change the command to be `['bundle', 'exec', 'rubocop']` instead of just `rubocop` so that you can use the gem versions specified in your local `Gemfile.lock`. This defaults to the name of the `required_executable`.

`flags`                                 | Array of arguments to append to the `command`. This is useful for customizing the behavior of a tool. It's also useful when a newer version of a tool removes/renames existing flags, so you can update the flags via your `.overcommit.yml` instead of waiting for an upstream fix in Overcommit.

`env`                                   | Hash of environment variables the hook should be run with. This is intended to be used as a last resort when an executable a hook runs is configured only via an environment variable. Any pre-existing environment variables with the same names as ones defined in `env` will have their original values restored after the hook runs. **NOTE:** Currently, only strings are accepted values. Boolean values will raise an error. **WARNING**: If you set the same environment variable for multiple hooks and you've enabled parallel hook runs, since the environment is shared across all threads you could accidentally have these separate hooks trample on each other. In this case, you should disable parallelization for the hook using the `parallelize` option.

`parallelize`                           | Whether to allow this hook to be run concurrently with other hooks. Disable this if the hook requires access to a shared resource that other hooks may also access and modify (e.g. files, the git index, process environment variables, etc).

`processors`                            | The number of processing units to reserve for this hook. This does not reserve CPUs, but indicates that out of the total number of possible concurrent hooks allowed by the global `concurrency` option, this hook requires the specified number. Thus in the typical case where `concurrency` is set to the number of available cores (default), and you have a hook that executes an application which itself creates 2 threads (or is otherwise scheduled on 2 cores), you can indicate that Overcommit should allocate 2 `processors` to the hook. Ideally this means your hooks won't put undue load on your available cores.

`install_command`                       | Command the user can run to install the `required_executable` (or alternately the specified `required_libraries`). This is intended for documentation purposes, as Overcommit does not install software on your behalf since there are too many edge cases where such behavior would result in incorrectly configured installations (e.g. installing a Python package in the global package space instead of in a virtual environment).

`skip_file_checkout`                    | Whether to skip this hook for file checkouts (e.g. `git checkout some-ref -- file`). Only applicable to `PostCheckout` hooks.

`skip_if`                               | Array of arguments to be executed to determine whether or not the hook should run. For example, setting this to a value of `['bash', '-c', '! which my-executable']` would allow you to skip running this hook if `my-executable` was not in the bin path.

In addition to the built-in configuration options, each hook can expose its

own unique configuration options. The `AuthorEmail` hook, for example, allows

you to customize the regex used to check commit author emails via the `pattern`

option—useful if you want to enforce that developers use a company

email address for their commits. This provides incredible flexibility for hook

authors as you can make your hooks sufficiently generic and then customize them

on a per-project basis.

### Hook Categories

Hook configurations are organized into categories based on the type of hook. So

`pre-commit` hooks are located under the `PreCommit` option, and `post-commit`

hooks are located under `PostCommit`. See the

[default configuration](config/default.yml) for a thorough example.

#### The `ALL` Hook

Within a hook category, there is a special type of hook configuration that

applies to _all_ hooks in the category. This configuration looks like a normal

hook configuration, except it has the name `ALL`:

```yaml

PreCommit:

  ALL:

    problem_on_unmodified_line: warn

    requires_files: true

    required: false

    quiet: false

  SomeHook:

    enabled: true

  ...

```

The `ALL` configuration is useful for when you want to

[DRY](http://en.wikipedia.org/wiki/Don%27t_repeat_yourself) up your

configuration, or when you want to apply changes across an entire category of

hooks.

Note that array configuration options (like `include`/`exclude`) in the

special `ALL` hook section are not merged with individual hook configurations

if custom ones are defined for the hook.

Any custom configuration option for `include`/`exclude` will replace the `ALL`

hook's configuration. If you want to have a global list of default exclusions

and extend them with a custom list, you can use YAML references, e.g.

```yaml

PreCommit:

  ALL:

    exclude: &default_excludes

      - 'node_modules/**/*'

      - 'vendor/**/*'

  MyHook:

    exclude:

      - *default_excludes

      - 'another/directory/in/addition/to/default/excludes/**/*'

```

Again, you can consult the [default configuration](config/default.yml) for

detailed examples of how the `ALL` hook can be used.

### Gemfile

You may want to enforce the version of Overcommit or other gems that you use in

your git hooks. This can be done by specifying the `gemfile` option in your

`.overcommit.yml`.

The `gemfile` option tells Overcommit to load the specified file with

[Bundler](http://bundler.io/), the standard gem dependency manager for Ruby.

This is useful if you would like to:

  - Enforce a specific version of Overcommit to use for all hook runs

    (or to use a version from the master branch that has not been released yet)

  - Enforce a specific version or unreleased branch is used for a gem you want

    to use in your git hooks

Loading a Bundler context necessarily adds a startup delay to your hook runs

as Bundler parses the specified `Gemfile` and checks that the dependencies are

satisfied. Thus for projects with many gems this can introduce a noticeable

delay.

The recommended workaround is to create a separate `Gemfile` in the root of

your repository (call it `.overcommit_gems.rb`), and include only the gems that

your Overcommit hooks need in order to run. Generate the associated lock file

by running:

```bash

bundle install --gemfile=.overcommit_gems.rb

```

...and commit `.overcommit_gems.rb` and the resulting

`.overcommit_gems.rb.lock` file to your repository. Set your `gemfile` option

to `.overcommit_gems.rb`, and you're all set.

Using a smaller Gemfile containing only the gems used by your Overcommit hooks

significantly reduces the startup delay in your hook runs. It is thus the

recommended approach unless your project has a relatively small number of gems

in your `Gemfile`.

### Plugin Directory

You can change the directory that project-specific hooks are loaded from via

the `plugin_directory` option. The default directory is `.git-hooks`.

### Quiet Hook Runs

If you prefer to have your hooks be completely silent unless there is a

problem, you can set the top-level `quiet` option to `true`. Note that if you

have many hooks or slow hooks this may not be desirable, as you don't get

visual feedback indicating the general progress of the hook run.

### Concurrency

Overcommit runs hooks in parallel by default, with a number of concurrent

workers equal to the number of logical cores on your machine. If you know your

particular set of hooks would benefit from higher/lower number of workers, you

can adjust the global `concurrency` option. You can define single-operator

mathematical expressions, e.g. `%{processors} * 2`, or `%{processors} / 2`.

```yaml

concurrency: '%{processors} / 4'

```

Note that individual hooks can specify the number of processors they require

with the `processors` hook option. See the [hook options](#hook-options)

section for more details.

### Signature Verification

You can disable manual verification of signatures by setting

`verify_signatures` to `false`. See the [Security](#security) section for more

information on this option and what exactly it controls.

## Built-In Hooks

Currently, Overcommit supports the following hooks out of the box—simply

enable them in your `.overcommit.yml`.

**Note**: Hooks with a `*` are enabled by default.

**Warning**: This list represents the list of hooks available on the `master`

branch. Please consult the [change log](CHANGELOG.md) to view which hooks have

not been released yet.

### CommitMsg

`commit-msg` hooks are run against every commit message you write before a

commit is created. A failed hook prevents a commit from being created. These

hooks are useful for enforcing policies on your commit messages, e.g. ensuring

a task ID is included for tracking purposes, or ensuring your commit messages

follow [proper formatting guidelines](http://tbaggery.com/2008/04/19/a-note-about-git-commit-messages.html).

* [`*`CapitalizedSubject](lib/overcommit/hook/commit_msg/capitalized_subject.rb)

* [`*`EmptyMessage](lib/overcommit/hook/commit_msg/empty_message.rb)

* [GerritChangeId](lib/overcommit/hook/commit_msg/gerrit_change_id.rb)

* [HardTabs](lib/overcommit/hook/commit_msg/hard_tabs.rb)

* [MessageFormat](lib/overcommit/hook/commit_msg/message_format.rb)

* [RussianNovel](lib/overcommit/hook/commit_msg/russian_novel.rb)

* [`*`SingleLineSubject](lib/overcommit/hook/commit_msg/single_line_subject.rb)

* [SpellCheck](lib/overcommit/hook/commit_msg/spell_check.rb)

* [`*`TextWidth](lib/overcommit/hook/commit_msg/text_width.rb)

* [`*`TrailingPeriod](lib/overcommit/hook/commit_msg/trailing_period.rb)

### PostCheckout

`post-checkout` hooks run after a successful `git checkout`, or in other words

any time your `HEAD` changes or a file is explicitly checked out.

* [BowerInstall](lib/overcommit/hook/post_checkout/bower_install.rb)

* [BundleInstall](lib/overcommit/hook/post_checkout/bundle_install.rb)

* [ComposerInstall](lib/overcommit/hook/post_checkout/composer_install.rb)

* [IndexTags](lib/overcommit/hook/post_checkout/index_tags.rb)

* [NpmInstall](lib/overcommit/hook/post_checkout/npm_install.rb)

* [SubmoduleStatus](lib/overcommit/hook/post_checkout/submodule_status.rb)

* [YarnInstall](lib/overcommit/hook/post_checkout/yarn_install.rb)

### PostCommit

`post-commit` hooks run after a commit is successfully created. A hook failing

in this case does not prevent the commit since it has already occurred;

however, it can be used to alert the user to some issue.

* [BowerInstall](lib/overcommit/hook/post_commit/bower_install.rb)

* [BundleInstall](lib/overcommit/hook/post_commit/bundle_install.rb)

* [Commitplease](lib/overcommit/hook/post_commit/commitplease.rb)

* [ComposerInstall](lib/overcommit/hook/post_commit/composer_install.rb)

* [GitGuilt](lib/overcommit/hook/post_commit/git_guilt.rb)

* [IndexTags](lib/overcommit/hook/post_commit/index_tags.rb)

* [NpmInstall](lib/overcommit/hook/post_commit/npm_install.rb)

* [SubmoduleStatus](lib/overcommit/hook/post_commit/submodule_status.rb)

* [YarnInstall](lib/overcommit/hook/post_commit/yarn_install.rb)

### PostMerge

`post-merge` hooks run after a `git merge` executes successfully with no merge

conflicts. A hook failing in this case does not prevent the merge since it has

already occurred; however, it can be used to alert the user to some issue.

* [BowerInstall](lib/overcommit/hook/post_merge/bower_install.rb)

* [BundleInstall](lib/overcommit/hook/post_merge/bundle_install.rb)

* [ComposerInstall](lib/overcommit/hook/post_merge/composer_install.rb)

* [IndexTags](lib/overcommit/hook/post_merge/index_tags.rb)

* [NpmInstall](lib/overcommit/hook/post_merge/npm_install.rb)

* [SubmoduleStatus](lib/overcommit/hook/post_merge/submodule_status.rb)

* [YarnInstall](lib/overcommit/hook/post_merge/yarn_install.rb)

### PostRewrite

`post-rewrite` hooks run after a commit is modified by a `git commit --amend`

or `git rebase`. A hook failing in this case does not prevent the rewrite since

it has already occurred; however, it can be used to alert the user to some

issue.

* [BowerInstall](lib/overcommit/hook/post_rewrite/bower_install.rb)

* [BundleInstall](lib/overcommit/hook/post_rewrite/bundle_install.rb)

* [ComposerInstall](lib/overcommit/hook/post_rewrite/composer_install.rb)

* [IndexTags](lib/overcommit/hook/post_rewrite/index_tags.rb)

* [NpmInstall](lib/overcommit/hook/post_rewrite/npm_install.rb)

* [SubmoduleStatus](lib/overcommit/hook/post_rewrite/submodule_status.rb)

* [YarnInstall](lib/overcommit/hook/post_rewrite/yarn_install.rb)

### PreCommit

`pre-commit` hooks are run after `git commit` is executed, but before the

commit message editor is displayed. If a hook fails, the commit will not be

created. These hooks are ideal for syntax checkers, linters, and other checks

that you want to run before you allow a commit to even be created.

#### WARNING: pre-commit hooks cannot have side effects

`pre-commit` hooks currently do not support hooks with side effects (such as

modifying files and adding them to the index with `git add`). This is a

consequence of Overcommit's pre-commit hook stashing behavior to ensure hooks

are run against _only the changes you are about to commit_.

Without Overcommit, the proper way to write a `pre-commit` hook would be to

extract the staged changes into temporary files and lint those files

instead of whatever contents are in your working tree (as you don't want

unstaged changes to taint your results). Overcommit takes care

of this for you, but to do it in a generalized way introduces this

limitation. See the [thread tracking this

issue](https://github.com/sds/overcommit/issues/238) for more details.

* [`*`AuthorEmail](lib/overcommit/hook/pre_commit/author_email.rb)

* [`*`AuthorName](lib/overcommit/hook/pre_commit/author_name.rb)

* [BerksfileCheck](lib/overcommit/hook/pre_commit/berksfile_check.rb)

* [`*`BrokenSymlinks](lib/overcommit/hook/pre_commit/broken_symlinks.rb)

* [BundleAudit](lib/overcommit/hook/pre_commit/bundle_audit.rb)

* [BundleCheck](lib/overcommit/hook/pre_commit/bundle_check.rb)

* [BundleOutdated](lib/overcommit/hook/pre_commit/bundle_outdated.rb)

* [`*`CaseConflicts](lib/overcommit/hook/pre_commit/case_conflicts.rb)

* [ChamberSecurity](lib/overcommit/hook/pre_commit/chamber_security.rb)

* [CodeSpellCheck](lib/overcommit/hook/pre_commit/code_spell_check.rb)

* [CoffeeLint](lib/overcommit/hook/pre_commit/coffee_lint.rb)

* [Credo](lib/overcommit/hook/pre_commit/credo.rb)

* [CssLint](lib/overcommit/hook/pre_commit/css_lint.rb)

* [DartAnalyzer](lib/overcommit/hook/pre_commit/dart_analyzer.rb)

* [Dogma](lib/overcommit/hook/pre_commit/dogma.rb)

* [ErbLint](lib/overcommit/hook/pre_commit/erb_lint.rb)

* [EsLint](lib/overcommit/hook/pre_commit/es_lint.rb)

* [ExecutePermissions](lib/overcommit/hook/pre_commit/execute_permissions.rb)

* [Fasterer](lib/overcommit/hook/pre_commit/fasterer.rb)

* [FileSize](lib/overcommit/hook/pre_commit/file_size.rb)

* [FixMe](lib/overcommit/hook/pre_commit/fix_me.rb)

* [Flay](lib/overcommit/hook/pre_commit/flay.rb)

* [Foodcritic](lib/overcommit/hook/pre_commit/foodcritic.rb)

* [ForbiddenBranches](lib/overcommit/hook/pre_commit/forbidden_branches.rb)

* [GoLint](lib/overcommit/hook/pre_commit/go_lint.rb)

* [GoVet](lib/overcommit/hook/pre_commit/go_vet.rb)

* [Hadolint](lib/overcommit/hook/pre_commit/hadolint.rb)

* [LicenseFinder](lib/overcommit/hook/pre_commit/license_finder.rb)

* [HamlLint](lib/overcommit/hook/pre_commit/haml_lint.rb)

* [HardTabs](lib/overcommit/hook/pre_commit/hard_tabs.rb)

* [Hlint](lib/overcommit/hook/pre_commit/hlint.rb)

* [HtmlHint](lib/overcommit/hook/pre_commit/html_hint.rb)

* [HtmlTidy](lib/overcommit/hook/pre_commit/html_tidy.rb)

* [ImageOptim](lib/overcommit/hook/pre_commit/image_optim.rb)

* [JavaCheckstyle](lib/overcommit/hook/pre_commit/java_checkstyle.rb)

* [Jscs](lib/overcommit/hook/pre_commit/jscs.rb)

* [JsHint](lib/overcommit/hook/pre_commit/js_hint.rb)

* [JsLint](lib/overcommit/hook/pre_commit/js_lint.rb)

* [Jsl](lib/overcommit/hook/pre_commit/jsl.rb)

* [JsonSyntax](lib/overcommit/hook/pre_commit/json_syntax.rb)

* [KtLint](lib/overcommit/hook/pre_commit/kt_lint.rb)

* [LicenseHeader](lib/overcommit/hook/pre_commit/license_header.rb)

* [LineEndings](lib/overcommit/hook/pre_commit/line_endings.rb)

* [LocalPathsInGemfile](lib/overcommit/hook/pre_commit/local_paths_in_gemfile.rb)

* [Mdl](lib/overcommit/hook/pre_commit/mdl.rb)

* [`*`MergeConflicts](lib/overcommit/hook/pre_commit/merge_conflicts.rb)

* [NginxTest](lib/overcommit/hook/pre_commit/nginx_test.rb)

* [PhpCs](lib/overcommit/hook/pre_commit/php_cs.rb)

* [PhpCsFixer](lib/overcommit/hook/pre_commit/php_cs_fixer.rb)

* [PhpLint](lib/overcommit/hook/pre_commit/php_lint.rb)

* [PhpStan](lib/overcommit/hook/pre_commit/php_stan.rb)

* [Pronto](lib/overcommit/hook/pre_commit/pronto.rb)

* [PuppetLint](lib/overcommit/hook/pre_commit/puppet_lint.rb)

* [PuppetMetadataJsonLint](lib/overcommit/hook/pre_commit/puppet_metadata_json_lint.rb)

* [Pycodestyle](lib/overcommit/hook/pre_commit/pycodestyle.rb)

* [Pydocstyle](lib/overcommit/hook/pre_commit/pydocstyle.rb)

* [Pyflakes](lib/overcommit/hook/pre_commit/pyflakes.rb)

* [Pylint](lib/overcommit/hook/pre_commit/pylint.rb)

* [PythonFlake8](lib/overcommit/hook/pre_commit/python_flake8.rb)

* [RakeTarget](lib/overcommit/hook/pre_commit/rake_target.rb)

* [RailsBestPractices](lib/overcommit/hook/pre_commit/rails_best_practices.rb)

* [RailsSchemaUpToDate](lib/overcommit/hook/pre_commit/rails_schema_up_to_date.rb)

* [Reek](lib/overcommit/hook/pre_commit/reek.rb)

* [RuboCop](lib/overcommit/hook/pre_commit/rubo_cop.rb)

* [RubyLint](lib/overcommit/hook/pre_commit/ruby_lint.rb)

* [RubySyntax](lib/overcommit/hook/pre_commit/ruby_syntax.rb)

* [SwiftLint](lib/overcommit/hook/pre_commit/swift_lint.rb)

* [Scalariform](lib/overcommit/hook/pre_commit/scalariform.rb)

* [Scalastyle](lib/overcommit/hook/pre_commit/scalastyle.rb)

* [ScssLint](lib/overcommit/hook/pre_commit/scss_lint.rb)

* [SemiStandard](lib/overcommit/hook/pre_commit/semi_standard.rb)

* [ShellCheck](lib/overcommit/hook/pre_commit/shell_check.rb)

* [SlimLint](lib/overcommit/hook/pre_commit/slim_lint.rb)

* [Sorbet](lib/overcommit/hook/pre_commit/sorbet.rb)

* [Sqlint](lib/overcommit/hook/pre_commit/sqlint.rb)

* [Standard](lib/overcommit/hook/pre_commit/standard.rb)

* [Stylelint](lib/overcommit/hook/pre_commit/stylelint.rb)

* [TrailingWhitespace](lib/overcommit/hook/pre_commit/trailing_whitespace.rb)

* [TravisLint](lib/overcommit/hook/pre_commit/travis_lint.rb)

* [TsLint](lib/overcommit/hook/pre_commit/ts_lint.rb)

* [Vint](lib/overcommit/hook/pre_commit/vint.rb)

* [W3cCss](lib/overcommit/hook/pre_commit/w3c_css.rb)

* [W3cHtml](lib/overcommit/hook/pre_commit/w3c_html.rb)

* [XmlLint](lib/overcommit/hook/pre_commit/xml_lint.rb)

* [XmlSyntax](lib/overcommit/hook/pre_commit/xml_syntax.rb)

* [YamlLint](lib/overcommit/hook/pre_commit/yaml_lint.rb)

* [YamlSyntax](lib/overcommit/hook/pre_commit/yaml_syntax.rb)

* [YardCoverage](lib/overcommit/hook/pre_commit/yard_coverage.rb)

* [YarnCheck](lib/overcommit/hook/pre_commit/yarn_check.rb)

### PrePush

`pre-push` hooks are run during `git push`, after remote refs have been updated

but before any objects have been transferred. If a hook fails, the push is

aborted.

* [Brakeman](lib/overcommit/hook/pre_push/brakeman.rb)

* [FlutterTest](lib/overcommit/hook/pre_push/flutter_test.rb)

* [Minitest](lib/overcommit/hook/pre_push/minitest.rb)

* [PhpUnit](lib/overcommit/hook/pre_push/php_unit.rb)

* [Pronto](lib/overcommit/hook/pre_push/pronto.rb)

* [ProtectedBranches](lib/overcommit/hook/pre_push/protected_branches.rb)

* [PubTest](lib/overcommit/hook/pre_push/pub_test.rb)

* [Pytest](lib/overcommit/hook/pre_push/pytest.rb)

* [PythonNose](lib/overcommit/hook/pre_push/python_nose.rb)

* [RakeTarget](lib/overcommit/hook/pre_push/rake_target.rb)

* [RSpec](lib/overcommit/hook/pre_push/r_spec.rb)

* [TestUnit](lib/overcommit/hook/pre_push/test_unit.rb)

### PreRebase

`pre-rebase` hooks are run during `git rebase`, before any commits are rebased.

If a hook fails, the rebase is aborted.

* [MergedCommits](lib/overcommit/hook/pre_rebase/merged_commits.rb)

## Repo-Specific hooks

Out of the box, `overcommit` comes with a set of hooks that enforce a variety of

styles and lints. However, some hooks only make sense in the context of a

specific repository.

For example, you can have a number of simple checks that run

against your code to catch common errors. For example, if you use

[RSpec](http://rspec.info/), you can make sure all spec files contain the

line `require 'spec_helper'`.

Inside our repository, we can add the file

`.git-hooks/pre_commit/ensure_spec_helper.rb` in order to automatically check

our spec files:

```ruby

module Overcommit::Hook::PreCommit

  class EnsureSpecHelper < Base

    def run

      errors = []

      applicable_files.each do |file|

        if File.read(file) !~ /^require 'spec_helper'/

          errors << "#{file}: missing `require 'spec_helper'`"

        end

      end

      return :fail, errors.join("\n") if errors.any?

      :pass

    end

  end

end

```

The corresponding configuration for this hook would look like:

```yaml

PreCommit:

  EnsureSpecHelper:

    enabled: true

    description: 'Checking for missing inclusion of spec_helper'

    include: '**/*_spec.rb'

```

### Adding Existing Git Hooks

You might already have hook scripts written which you'd like to integrate with

Overcommit right away. To make this easy, Overcommit allows you to include

your hook script in your configuration without writing any Ruby code.

For example:

```yaml

PostCheckout:

  CustomScript:

    enabled: true

    required_executable: './bin/custom-script'

```

So long as a command is given (either by specifying the `command` option

directly or specifying `required_executable`) a special hook is created that

executes the command and appends any arguments and standard input stream that

would have been passed to the regular hook. The hook passes or fails based

on the exit status of the command.

The script is executed as if Git were calling the hook directly. If you want

to understand which arguments are passed to the script depending on the type

of hook, see the [git-hooks documentation][GHD].

[GHD]: https://git-scm.com/book/en/v2/Customizing-Git-Git-Hooks

## Security

While Overcommit can make managing Git hooks easier and more convenient,

this convenience can come at a cost of being less secure.

Since installing Overcommit hooks will allow arbitrary plugin code in your

repository to be executed, you expose yourself to an attack where checking

out code from a third party can result in malicious code being executed

on your system.

As an example, consider the situation where you have an open source project.

An attacker could submit a pull request which adds a `post-checkout` hook

that executes some malicious code. When you fetch and checkout this pull

request, the `post-checkout` hook will be run on your machine, along with

the malicious code that you just checked out.

Overcommit attempts to address this problem by storing a signature of your

configuration and all hook plugin code since the last time it ran. When the

signature changes, a warning is displayed alerting you to which plugins have

changed. It is then up to you to manually verify that the changes are not

malicious, and then continue running the hooks.

The signature is derived from the contents of the plugin's source code itself

and any configuration for the plugin. Thus a change to the plugin's source

code or your local repo's `.overcommit.yml` file could result in a signature

change.

### Disabling Signature Checking

In typical usage, your plugins usually don't change too often, so this warning

shouldn't become a nuisance. However, users who work within proprietary

repositories where all developers who can push changes to the repository

already have a minimum security clearance may wish to disable this check.

While not recommended, you can disable signature verification by setting

`verify_signatures` to `false` in your `.overcommit.yml` file.

**Regardless of whether you have `verify_signatures` disabled for your project,

if you are running Overcommit for the first time you will need to sign your

configuration with `overcommit --sign`**. This needs to happen once so

Overcommit can record in your local git repo's configuration (outside of source

control) that you intend to enable/disable verification. This way if someone

else changes `verify_signatures` you'll be asked to confirm the change.

## Contributing

We love contributions to Overcommit, be they bug reports, feature ideas, or

pull requests. See our [guidelines for contributing](CONTRIBUTING.md) to best

ensure your thoughts, ideas, or code get merged.

## Community

All major discussion surrounding Overcommit happens on the

[GitHub issues list](https://github.com/sds/overcommit/issues).

## Changelog

If you're interested in seeing the changes and bug fixes between each version

of `overcommit`, read the [Overcommit Changelog](CHANGELOG.md).

## License

This project is released under the [MIT license](MIT-LICENSE).

The Overcommit logo is adapted from the [Git Logo by Jason Long][GL], and

is licensed under the [Creative Commons Attribution 3.0 Unported License][CC3].

[GL]: https://git-scm.com/downloads/logos

[CC3]: http://creativecommons.org/licenses/by/3.0/