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https://github.com/postmodern/chruby

Changes the current Ruby
https://github.com/postmodern/chruby
Last synced: 1 day ago
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Changes the current Ruby
Host: GitHub
URL: https://github.com/postmodern/chruby
Owner: postmodern
License: mit
Created: 2012-08-01T23:46:08.000Z (over 12 years ago)
Default Branch: master
Last Pushed: 2023-04-27T11:08:46.000Z (over 1 year ago)
Last Synced: 2024-12-05T01:06:07.959Z (8 days ago)
Language: Shell
Homepage:
Size: 622 KB
Stars: 2,882
Watchers: 48
Forks: 189
Open Issues: 99
Metadata Files:
- Readme: README.md
- Changelog: ChangeLog.md
- Contributing: CONTRIBUTING.md
- License: LICENSE.txt
Awesome Lists containing this project

awesome-ruby-toolbox - chruby - Changes the current Ruby (Developer Tools / Ruby Version Management)
awesome-ruby - chruby - Change your current Ruby. No shims, no crazy options or features, ~90 LOC. (Environment Management)
awesome-starred-test - postmodern/chruby - Changes the current Ruby (Shell)
awesome-env - chruby
awesome-version-managers - chruby - A Ruby version switcher that allows for auto-switching, updates PATH and has around 100 lines of code. (Version Managers / Ruby)
README

        # chruby

[![CI](https://github.com/postmodern/chruby/actions/workflows/shunit2.yml/badge.svg)](https://github.com/postmodern/chruby/actions/workflows/shunit2.yml)

Changes the current Ruby.

## Features

* Updates `$PATH`.

  * Also adds RubyGems `bin/` directories to `$PATH`.

* Correctly sets `$GEM_HOME` and `$GEM_PATH`.

  * Users: gems are installed into `~/.gem/$ruby/$version`.

  * Root: gems are installed directly into `/path/to/$ruby/$gemdir`.

* Additionally sets `$RUBY_ROOT`, `$RUBY_ENGINE`, `$RUBY_VERSION` and

  `$GEM_ROOT`.

* Optionally sets `$RUBYOPT` if second argument is given.

* Calls `hash -r` to clear the command-lookup hash-table.

* Fuzzy matching of Rubies by name.

* Defaults to the system Ruby.

* Optionally supports auto-switching and the `.ruby-version` file.

* Supports [bash] and [zsh].

* Small (~100 LOC).

* Has tests.

## Anti-Features

* Does not hook `cd`.

* Does not install executable shims or require regenerating them after

  installing gems.

* Does not require Rubies be installed into your home directory.

* Does not automatically switch Rubies by default.

* Does not require write-access to the Ruby directory in order to install gems.

## Requirements

* [bash] >= 3 or [zsh]

## Install

```shell

wget https://github.com/postmodern/chruby/releases/download/v0.3.9/chruby-0.3.9.tar.gz

tar -xzvf chruby-0.3.9.tar.gz

cd chruby-0.3.9/

sudo make install

```

### PGP

All releases are [PGP] signed for security. Instructions on how to import my

PGP key can be found on my [blog][1]. To verify that a release was not tampered 

with:

```shell

wget https://github.com/postmodern/chruby/releases/download/v0.3.9/chruby-0.3.9.tar.gz.asc

gpg --verify chruby-0.3.9.tar.gz.asc chruby-0.3.9.tar.gz

```

### setup.sh

chruby also includes a `setup.sh` script, which installs chruby. Simply run the 

script as root or via `sudo`:

```shell

sudo ./scripts/setup.sh

```

### Homebrew

chruby can also be installed with [homebrew]:

```shell

brew install chruby

```

Or the absolute latest chruby can be installed from source:

```shell

brew install chruby --HEAD

```

### Arch Linux

chruby is already included in the [AUR]:

```shell

yaourt -S chruby

```

### Fedora Linux

chruby is available as an rpm on [Fedora Copr](https://copr.fedorainfracloud.org/coprs/postmodern/chruby/).

    

### FreeBSD

chruby is included in the official [FreeBSD ports collection]:

```shell

cd /usr/ports/devel/chruby/ && make install clean

```

### Rubies

#### Manually

Chruby provides detailed instructions for installing additional Rubies:

* [Ruby](https://github.com/postmodern/chruby/wiki/Ruby)

* [JRuby](https://github.com/postmodern/chruby/wiki/JRuby)

* [Rubinius](https://github.com/postmodern/chruby/wiki/Rubinius)

* [MagLev](https://github.com/postmodern/chruby/wiki/MagLev)

#### ruby-install

You can also use [ruby-install] to install additional Rubies:

Installing to `/opt/rubies` or `~/.rubies`:

```shell

ruby-install ruby

ruby-install jruby

ruby-install rubinius

ruby-install maglev

```

#### ruby-build

You can also use [ruby-build] to install additional Rubies:

Installing to `/opt/rubies`:

```shell

ruby-build 1.9.3-p392 /opt/rubies/ruby-1.9.3-p392

ruby-build jruby-1.7.3 /opt/rubies/jruby-1.7.3

ruby-build rbx-2.0.0-rc1 /opt/rubies/rubinius-2.0.0-rc1

ruby-build maglev-1.0.0 /opt/rubies/maglev-1.0.0

```

## Configuration

Add the following to the `~/.bashrc` or `~/.zshrc` file:

```shell

source /usr/local/share/chruby/chruby.sh

```

#### macOS

```shell

source $HOMEBREW_PREFIX/opt/chruby/share/chruby/chruby.sh # Or run `brew info chruby` to find out installed directory

```

*Note:* macOS does not automatically execute `~/.bashrc`, instead try adding to `/etc/bashrc`.

### System Wide

If you wish to enable chruby system-wide, add the following to

`/etc/profile.d/chruby.sh`:

```shell

if [ -n "$BASH_VERSION" ] || [ -n "$ZSH_VERSION" ]; then

  source /usr/local/share/chruby/chruby.sh

  ...

fi

```

This will prevent chruby from accidentally being loaded by `/bin/sh`, which

is not always the same as `/bin/bash`.

### Rubies

When chruby is first loaded by the shell, it will auto-detect Rubies installed

in `/opt/rubies/` and `~/.rubies/`. After installing new Rubies, you _must_

restart the shell before chruby can recognize them.

For Rubies installed in non-standard locations, simply append their paths to

the `RUBIES` variable:

```shell

source /usr/local/share/chruby/chruby.sh

RUBIES+=(

  /opt/jruby-1.7.0

  "$HOME/src/rubinius"

)

```

### Migrating

If you are migrating from another Ruby manager, set `RUBIES` accordingly:

#### RVM

```shell

RUBIES+=(~/.rvm/rubies/*)

```

#### rbenv

```shell

RUBIES+=(~/.rbenv/versions/*)

```

#### rbfu

```shell

RUBIES+=(~/.rbfu/rubies/*)

```

### Auto-Switching

If you want chruby to auto-switch the current version of Ruby when you `cd`

between your different projects, simply load `auto.sh` in `~/.bashrc` or

`~/.zshrc`:

```shell

source /usr/local/share/chruby/chruby.sh

source /usr/local/share/chruby/auto.sh

```

> *Note:* macOS does not automatically source `~/.bashrc`. Bash users should

> create the file `~/.bash_profile` with following content:

>

> ```bash

> if [[ -f ~/.profile ]]; then

>     source ~/.profile

> fi

>

> if [[ $- == *i* ]] && [[ -f ~/.bashrc ]]; then

>     source ~/.bashrc

> fi

> ```

>

> so that the terminal loads `~/.bashrc` and `~/.profile` (the POSIX one). If

> `~/.bash_profile` exists, Bash users should append the above lines to

> `~/.bash_profile` as needed.

chruby will check the current and parent directories for a [.ruby-version]

file. Other Ruby switchers also understand this file:

https://gist.github.com/1912050

If you want to automatically run the version of a gem executable specified in 

your project's Gemfile, try 

[rubygems-bundler](https://github.com/mpapis/rubygems-bundler).

### Default Ruby

Once you have loaded `chruby.sh` and/or `auto.sh` in your shell configuration,

you can also set a default Ruby. Simply call the `chruby` function in

`~/.bash_profile` or `~/.zprofile`:

```shell

chruby ruby-1.9

```

If you have enabled auto-switching, simply create a `.ruby-version` file:

```shell

echo "ruby-1.9" > ~/.ruby-version

```

### RubyGems

Gems installed as a non-root user via `gem install` will be installed into

`~/.gem/$ruby/X.Y.Z`.  By default, RubyGems will use the absolute path to the

currently selected ruby for the shebang of any binstubs it generates.  In some

cases, this path may contain extra version information (e.g.

`ruby-2.0.0-p451`).  To mitigate potential problems when removing rubies, you

can force RubyGems to generate binstubs with shebangs that will search for

ruby in your `$PATH` by using `gem install --env-shebang` (or the equivalent

short option `-E`).  This parameter can also be added to your gemrc file.

### Integration

For instructions on using chruby with other tools, please see the [wiki]:

* [Capistrano](https://github.com/capistrano/chruby#readme)

* [Chef](https://supermarket.getchef.com/cookbooks/chruby_install)

* [Cron](https://github.com/postmodern/chruby/wiki/Cron)

* [Emacs](https://github.com/arnebrasseur/chruby.el#readme)

* [Pow](https://github.com/postmodern/chruby/wiki/Pow)

* [Puppet](https://github.com/dgoodlad/puppet-chruby#readme)

* [Sudo](https://github.com/postmodern/chruby/wiki/Sudo)

* [Vim](https://github.com/postmodern/chruby/wiki/Vim)

* [Fish](https://github.com/JeanMertz/chruby-fish#readme)

## Examples

List available Rubies:

    $ chruby

       ruby-1.9.3-p392

       jruby-1.7.0

       rubinius-2.0.0-rc1

Select a Ruby:

    $ chruby 1.9.3

    $ chruby

     * ruby-1.9.3-p392

       jruby-1.7.0

       rubinius-2.0.0-rc1

    $ echo $PATH

    /home/hal/.gem/ruby/1.9.3/bin:/opt/rubies/ruby-1.9.3-p392/lib/ruby/gems/1.9.1/bin:/opt/rubies/ruby-1.9.3-p392/bin:/usr/lib64/qt-3.3/bin:/usr/local/bin:/usr/bin:/bin:/usr/local/sbin:/usr/sbin:/home/hal/bin:/home/hal/bin

    $ gem env

    RubyGems Environment:

      - RUBYGEMS VERSION: 1.8.23

      - RUBY VERSION: 1.9.3 (2013-02-22 patchlevel 392) [x86_64-linux]

      - INSTALLATION DIRECTORY: /home/hal/.gem/ruby/1.9.3

      - RUBY EXECUTABLE: /opt/rubies/ruby-1.9.3-p392/bin/ruby

      - EXECUTABLE DIRECTORY: /home/hal/.gem/ruby/1.9.3/bin

      - RUBYGEMS PLATFORMS:

        - ruby

        - x86_64-linux

      - GEM PATHS:

         - /home/hal/.gem/ruby/1.9.3

         - /opt/rubies/ruby-1.9.3-p392/lib/ruby/gems/1.9.1

      - GEM CONFIGURATION:

         - :update_sources => true

         - :verbose => true

         - :benchmark => false

         - :backtrace => false

         - :bulk_threshold => 1000

         - "gem" => "--no-rdoc"

      - REMOTE SOURCES:

         - http://rubygems.org/

Switch to JRuby in 1.9 mode:

    $ chruby jruby --1.9

    $ ruby -v

    jruby 1.7.0 (1.9.3p203) 2012-10-22 ff1ebbe on OpenJDK 64-Bit Server VM 1.7.0_09-icedtea-mockbuild_2012_10_17_15_53-b00 [linux-amd64]

Switch back to system Ruby:

    $ chruby system

    $ echo $PATH

    /usr/local/bin:/usr/bin:/bin:/usr/local/sbin:/usr/sbin:/sbin:/home/hal/bin

Run a command under a Ruby with `chruby-exec`:

    $ chruby-exec jruby -- gem update

Switch to an arbitrary Ruby on the fly:

    $ chruby_use /path/to/ruby

## Uninstall

1. Remove or comment out chruby from your shell configuration.

2. Restart your shell (ex: `exec $SHELL`).

3. `sudo make uninstall`

## Alternatives

* [RVM]

* [rbenv]

* [rbfu]*

* [ry]

* [ruby-version]*

\* *Deprecated in favor of chruby.*

## Endorsements

> yeah `chruby` is nice, does the limited thing of switching really good,

> the only hope it never grows 

-- [Michal Papis](https://twitter.com/mpapis/status/258049391791841280) of [RVM]

> I just looooove [chruby](#readme) For the first time I'm in total control of

> all aspects of my Ruby installation. 

-- [Marius Mathiesen](https://twitter.com/zmalltalker/status/271192206268829696)

> Written by Postmodern, it's basically the simplest possible thing that can

> work.

-- [Steve Klabnik](http://blog.steveklabnik.com/posts/2012-12-13-getting-started-with-chruby)

> So far, I'm a huge fan. The tool does what it advertises exactly and simply.

> The small feature-set is also exactly and only the features I need.

-- [Patrick Brisbin](http://pbrisbin.com/posts/chruby)

> I wrote ruby-version; however, chruby is already what ruby-version wanted to

> be. I've deprecated ruby-version in favor of chruby.

-- [Wil Moore III](https://github.com/wilmoore)

## Credits

* [mpapis](https://github.com/mpapis) for reviewing the code.

* [havenwood](https://github.com/havenwood) for handling the homebrew formula.

* [zendeavor](https://github.com/zendeavor) for style fixes.

* `#bash`, `#zsh`, `#machomebrew` for answering all my questions.

[wiki]: https://github.com/postmodern/chruby/wiki

[bash]: http://www.gnu.org/software/bash/

[zsh]: http://www.zsh.org/

[PGP]: http://en.wikipedia.org/wiki/Pretty_Good_Privacy

[homebrew]: http://brew.sh/

[AUR]: https://aur.archlinux.org/packages/chruby/

[FreeBSD ports collection]: https://www.freshports.org/devel/chruby/

[ruby-install]: https://github.com/postmodern/ruby-install#readme

[ruby-build]: https://github.com/sstephenson/ruby-build#readme

[.ruby-version]: https://gist.github.com/1912050

[RVM]: https://rvm.io/

[rbenv]: https://github.com/sstephenson/rbenv#readme

[rbfu]: https://github.com/hmans/rbfu#readme

[ry]: https://github.com/jayferd/ry#readme

[ruby-version]: https://github.com/wilmoore/ruby-version#readme

[Ruby]: http://www.ruby-lang.org/en/

[JRuby]: http://jruby.org/

[Rubinius]: http://rubini.us/

[1]: https://postmodern.github.io/pgp/