bundle-config(1) -- Set bundler configuration options
=====================================================

## SYNOPSIS

`bundle config` list<br>
`bundle config` [get] NAME<br>
`bundle config` [set] NAME VALUE<br>
`bundle config` unset NAME

## DESCRIPTION

This command allows you to interact with Bundler's configuration system.

Bundler loads configuration settings in this order:

1. Local config (`<project_root>/.bundle/config` or `$BUNDLE_APP_CONFIG/config`)
2. Environmental variables (`ENV`)
3. Global config (`~/.bundle/config`)
4. Bundler default config

Executing `bundle config list` with will print a list of all bundler
configuration for the current bundle, and where that configuration
was set.

Executing `bundle config get <name>` will print the value of that configuration
setting, and where it was set.

Executing `bundle config set <name> <value>` defaults to setting `local`
configuration if executing from within a local application, otherwise it will
set `global` configuration. See `--local` and `--global` options below.

Executing `bundle config set --local <name> <value>` will set that configuration
in the directory for the local application. The configuration will be stored in
`<project_root>/.bundle/config`. If `BUNDLE_APP_CONFIG` is set, the configuration
will be stored in `$BUNDLE_APP_CONFIG/config`.

Executing `bundle config set --global <name> <value>` will set that
configuration to the value specified for all bundles executed as the current
user. The configuration will be stored in `~/.bundle/config`. If <name> already
is set, <name> will be overridden and user will be warned.

Executing `bundle config unset <name>` will delete the configuration in both
local and global sources.

Executing `bundle config unset --global <name>` will delete the configuration
only from the user configuration.

Executing `bundle config unset --local <name>` will delete the configuration
only from the local application.

Executing bundle with the `BUNDLE_IGNORE_CONFIG` environment variable set will
cause it to ignore all configuration.

## REMEMBERING OPTIONS

Flags passed to `bundle install` or the Bundler runtime, such as `--path foo` or
`--without production`, are remembered between commands and saved to your local
application's configuration (normally, `./.bundle/config`).

However, this will be changed in bundler 3, so it's better not to rely on this
behavior. If these options must be remembered, it's better to set them using
`bundle config` (e.g., `bundle config set --local path foo`).

The options that can be configured are:

* `bin`:
   Creates a directory (defaults to `~/bin`) and place any executables from the
   gem there. These executables run in Bundler's context. If used, you might add
   this directory to your environment's `PATH` variable. For instance, if the
   `rails` gem comes with a `rails` executable, this flag will create a
   `bin/rails` executable that ensures that all referred dependencies will be
   resolved using the bundled gems.

* `deployment`:
   In deployment mode, Bundler will 'roll-out' the bundle for
   `production` use. Please check carefully if you want to have this option
   enabled in `development` or `test` environments.

* `only`:
   A space-separated list of groups to install only gems of the specified groups.

* `path`:
   The location to install the specified gems to. This defaults to Rubygems'
   setting. Bundler shares this location with Rubygems, `gem install ...` will
   have gem installed there, too. Therefore, gems installed without a
   `--path ...` setting will show up by calling `gem list`. Accordingly, gems
   installed to other locations will not get listed.

* `without`:
   A space-separated list of groups referencing gems to skip during installation.

* `with`:
  A space-separated list of **optional** groups referencing gems to include during installation.

## BUILD OPTIONS

You can use `bundle config` to give Bundler the flags to pass to the gem
installer every time bundler tries to install a particular gem.

A very common example, the `mysql` gem, requires Snow Leopard users to
pass configuration flags to `gem install` to specify where to find the
`mysql_config` executable.

    gem install mysql -- --with-mysql-config=/usr/local/mysql/bin/mysql_config

Since the specific location of that executable can change from machine
to machine, you can specify these flags on a per-machine basis.

    bundle config set --global build.mysql --with-mysql-config=/usr/local/mysql/bin/mysql_config

After running this command, every time bundler needs to install the
`mysql` gem, it will pass along the flags you specified.

## CONFIGURATION KEYS

Configuration keys in bundler have two forms: the canonical form and the
environment variable form.

For instance, passing the `--without` flag to [bundle install(1)](bundle-install.1.html)
prevents Bundler from installing certain groups specified in the Gemfile(5). Bundler
persists this value in `app/.bundle/config` so that calls to `Bundler.setup`
do not try to find gems from the `Gemfile` that you didn't install. Additionally,
subsequent calls to [bundle install(1)](bundle-install.1.html) remember this setting
and skip those groups.

The canonical form of this configuration is `"without"`. To convert the canonical
form to the environment variable form, capitalize it, and prepend `BUNDLE_`. The
environment variable form of `"without"` is `BUNDLE_WITHOUT`.

Any periods in the configuration keys must be replaced with two underscores when
setting it via environment variables. The configuration key `local.rack` becomes
the environment variable `BUNDLE_LOCAL__RACK`.

## LIST OF AVAILABLE KEYS

The following is a list of all configuration keys and their purpose. You can
learn more about their operation in [bundle install(1)](bundle-install.1.html).

* `allow_deployment_source_credential_changes` (`BUNDLE_ALLOW_DEPLOYMENT_SOURCE_CREDENTIAL_CHANGES`):
   When in deployment mode, allow changing the credentials to a gem's source.
   Ex: `https://some.host.com/gems/path/` -> `https://user_name:password@some.host.com/gems/path`
* `allow_offline_install` (`BUNDLE_ALLOW_OFFLINE_INSTALL`):
   Allow Bundler to use cached data when installing without network access.
* `auto_clean_without_path` (`BUNDLE_AUTO_CLEAN_WITHOUT_PATH`):
   Automatically run `bundle clean` after installing when an explicit `path`
   has not been set and Bundler is not installing into the system gems.
* `auto_install` (`BUNDLE_AUTO_INSTALL`):
   Automatically run `bundle install` when gems are missing.
* `bin` (`BUNDLE_BIN`):
   Install executables from gems in the bundle to the specified directory.
   Defaults to `false`.
* `cache_all` (`BUNDLE_CACHE_ALL`):
   Cache all gems, including path and git gems. This needs to be explicitly
   configured on bundler 1 and bundler 2, but will be the default on bundler 3.
* `cache_all_platforms` (`BUNDLE_CACHE_ALL_PLATFORMS`):
   Cache gems for all platforms.
* `cache_path` (`BUNDLE_CACHE_PATH`):
   The directory that bundler will place cached gems in when running
   <code>bundle package</code>, and that bundler will look in when installing gems.
   Defaults to `vendor/cache`.
* `clean` (`BUNDLE_CLEAN`):
   Whether Bundler should run `bundle clean` automatically after
   `bundle install`.
* `console` (`BUNDLE_CONSOLE`):
   The console that `bundle console` starts. Defaults to `irb`.
* `default_install_uses_path` (`BUNDLE_DEFAULT_INSTALL_USES_PATH`):
   Whether a `bundle install` without an explicit `--path` argument defaults
   to installing gems in `.bundle`.
* `deployment` (`BUNDLE_DEPLOYMENT`):
   Disallow changes to the `Gemfile`. When the `Gemfile` is changed and the
   lockfile has not been updated, running Bundler commands will be blocked.
* `disable_checksum_validation` (`BUNDLE_DISABLE_CHECKSUM_VALIDATION`):
   Allow installing gems even if they do not match the checksum provided by
   RubyGems.
* `disable_exec_load` (`BUNDLE_DISABLE_EXEC_LOAD`):
   Stop Bundler from using `load` to launch an executable in-process in
   `bundle exec`.
* `disable_local_branch_check` (`BUNDLE_DISABLE_LOCAL_BRANCH_CHECK`):
   Allow Bundler to use a local git override without a branch specified in the
   Gemfile.
* `disable_local_revision_check` (`BUNDLE_DISABLE_LOCAL_REVISION_CHECK`):
   Allow Bundler to use a local git override without checking if the revision
   present in the lockfile is present in the repository.
* `disable_shared_gems` (`BUNDLE_DISABLE_SHARED_GEMS`):
   Stop Bundler from accessing gems installed to RubyGems' normal location.
* `disable_version_check` (`BUNDLE_DISABLE_VERSION_CHECK`):
   Stop Bundler from checking if a newer Bundler version is available on
   rubygems.org.
* `force_ruby_platform` (`BUNDLE_FORCE_RUBY_PLATFORM`):
   Ignore the current machine's platform and install only `ruby` platform gems.
   As a result, gems with native extensions will be compiled from source.
* `frozen` (`BUNDLE_FROZEN`):
   Disallow changes to the `Gemfile`. When the `Gemfile` is changed and the
   lockfile has not been updated, running Bundler commands will be blocked.
   Defaults to `true` when `--deployment` is used.
* `gem.github_username` (`BUNDLE_GEM__GITHUB_USERNAME`):
   Sets a GitHub username or organization to be used in `README` file when you
   create a new gem via `bundle gem` command. It can be overridden by passing an
   explicit `--github-username` flag to `bundle gem`.
* `gem.push_key` (`BUNDLE_GEM__PUSH_KEY`):
   Sets the `--key` parameter for `gem push` when using the `rake release`
   command with a private gemstash server.
* `gemfile` (`BUNDLE_GEMFILE`):
   The name of the file that bundler should use as the `Gemfile`. This location
   of this file also sets the root of the project, which is used to resolve
   relative paths in the `Gemfile`, among other things. By default, bundler
   will search up from the current working directory until it finds a
   `Gemfile`.
* `global_gem_cache` (`BUNDLE_GLOBAL_GEM_CACHE`):
   Whether Bundler should cache all gems globally, rather than locally to the
   installing Ruby installation.
* `ignore_funding_requests` (`BUNDLE_IGNORE_FUNDING_REQUESTS`):
   When set, no funding requests will be printed.
* `ignore_messages` (`BUNDLE_IGNORE_MESSAGES`):
   When set, no post install messages will be printed. To silence a single gem,
   use dot notation like `ignore_messages.httparty true`.
* `init_gems_rb` (`BUNDLE_INIT_GEMS_RB`):
   Generate a `gems.rb` instead of a `Gemfile` when running `bundle init`.
* `jobs` (`BUNDLE_JOBS`):
   The number of gems Bundler can install in parallel. Defaults to the number of
   available processors.
* `no_install` (`BUNDLE_NO_INSTALL`):
   Whether `bundle package` should skip installing gems.
* `no_prune` (`BUNDLE_NO_PRUNE`):
   Whether Bundler should leave outdated gems unpruned when caching.
* `only` (`BUNDLE_ONLY`):
   A space-separated list of groups to install only gems of the specified groups.
* `path` (`BUNDLE_PATH`):
   The location on disk where all gems in your bundle will be located regardless
   of `$GEM_HOME` or `$GEM_PATH` values. Bundle gems not found in this location
   will be installed by `bundle install`. Defaults to `Gem.dir`. When --deployment
   is used, defaults to vendor/bundle.
* `path.system` (`BUNDLE_PATH__SYSTEM`):
   Whether Bundler will install gems into the default system path (`Gem.dir`).
* `path_relative_to_cwd` (`BUNDLE_PATH_RELATIVE_TO_CWD`)
   Makes `--path` relative to the CWD instead of the `Gemfile`.
* `plugins` (`BUNDLE_PLUGINS`):
   Enable Bundler's experimental plugin system.
* `prefer_patch` (BUNDLE_PREFER_PATCH):
   Prefer updating only to next patch version during updates. Makes `bundle update` calls equivalent to `bundler update --patch`.
* `print_only_version_number` (`BUNDLE_PRINT_ONLY_VERSION_NUMBER`):
   Print only version number from `bundler --version`.
* `redirect` (`BUNDLE_REDIRECT`):
   The number of redirects allowed for network requests. Defaults to `5`.
* `retry` (`BUNDLE_RETRY`):
   The number of times to retry failed network requests. Defaults to `3`.
* `setup_makes_kernel_gem_public` (`BUNDLE_SETUP_MAKES_KERNEL_GEM_PUBLIC`):
   Have `Bundler.setup` make the `Kernel#gem` method public, even though
   RubyGems declares it as private.
* `shebang` (`BUNDLE_SHEBANG`):
   The program name that should be invoked for generated binstubs. Defaults to
   the ruby install name used to generate the binstub.
* `silence_deprecations` (`BUNDLE_SILENCE_DEPRECATIONS`):
   Whether Bundler should silence deprecation warnings for behavior that will
   be changed in the next major version.
* `silence_root_warning` (`BUNDLE_SILENCE_ROOT_WARNING`):
   Silence the warning Bundler prints when installing gems as root.
* `ssl_ca_cert` (`BUNDLE_SSL_CA_CERT`):
   Path to a designated CA certificate file or folder containing multiple
   certificates for trusted CAs in PEM format.
* `ssl_client_cert` (`BUNDLE_SSL_CLIENT_CERT`):
   Path to a designated file containing a X.509 client certificate
   and key in PEM format.
* `ssl_verify_mode` (`BUNDLE_SSL_VERIFY_MODE`):
   The SSL verification mode Bundler uses when making HTTPS requests.
   Defaults to verify peer.
* `suppress_install_using_messages` (`BUNDLE_SUPPRESS_INSTALL_USING_MESSAGES`):
   Avoid printing `Using ...` messages during installation when the version of
   a gem has not changed.
* `system_bindir` (`BUNDLE_SYSTEM_BINDIR`):
   The location where RubyGems installs binstubs. Defaults to `Gem.bindir`.
* `timeout` (`BUNDLE_TIMEOUT`):
   The seconds allowed before timing out for network requests. Defaults to `10`.
* `update_requires_all_flag` (`BUNDLE_UPDATE_REQUIRES_ALL_FLAG`):
   Require passing `--all` to `bundle update` when everything should be updated,
   and disallow passing no options to `bundle update`.
* `user_agent` (`BUNDLE_USER_AGENT`):
   The custom user agent fragment Bundler includes in API requests.
* `with` (`BUNDLE_WITH`):
   A `:`-separated list of groups whose gems bundler should install.
* `without` (`BUNDLE_WITHOUT`):
   A `:`-separated list of groups whose gems bundler should not install.

In general, you should set these settings per-application by using the applicable
flag to the [bundle install(1)](bundle-install.1.html) or [bundle cache(1)](bundle-cache.1.html) command.

You can set them globally either via environment variables or `bundle config`,
whichever is preferable for your setup. If you use both, environment variables
will take preference over global settings.

## LOCAL GIT REPOS

Bundler also allows you to work against a git repository locally
instead of using the remote version. This can be achieved by setting
up a local override:

    bundle config set --local local.GEM_NAME /path/to/local/git/repository

For example, in order to use a local Rack repository, a developer could call:

    bundle config set --local local.rack ~/Work/git/rack

Now instead of checking out the remote git repository, the local
override will be used. Similar to a path source, every time the local
git repository change, changes will be automatically picked up by
Bundler. This means a commit in the local git repo will update the
revision in the `Gemfile.lock` to the local git repo revision. This
requires the same attention as git submodules. Before pushing to
the remote, you need to ensure the local override was pushed, otherwise
you may point to a commit that only exists in your local machine.
You'll also need to CGI escape your usernames and passwords as well.

Bundler does many checks to ensure a developer won't work with
invalid references. Particularly, we force a developer to specify
a branch in the `Gemfile` in order to use this feature. If the branch
specified in the `Gemfile` and the current branch in the local git
repository do not match, Bundler will abort. This ensures that
a developer is always working against the correct branches, and prevents
accidental locking to a different branch.

Finally, Bundler also ensures that the current revision in the
`Gemfile.lock` exists in the local git repository. By doing this, Bundler
forces you to fetch the latest changes in the remotes.

## MIRRORS OF GEM SOURCES

Bundler supports overriding gem sources with mirrors. This allows you to
configure rubygems.org as the gem source in your Gemfile while still using your
mirror to fetch gems.

    bundle config set --global mirror.SOURCE_URL MIRROR_URL

For example, to use a mirror of https://rubygems.org hosted at https://example.org:

    bundle config set --global mirror.https://rubygems.org https://example.org

Each mirror also provides a fallback timeout setting. If the mirror does not
respond within the fallback timeout, Bundler will try to use the original
server instead of the mirror.

    bundle config set --global mirror.SOURCE_URL.fallback_timeout TIMEOUT

For example, to fall back to rubygems.org after 3 seconds:

    bundle config set --global mirror.https://rubygems.org.fallback_timeout 3

The default fallback timeout is 0.1 seconds, but the setting can currently
only accept whole seconds (for example, 1, 15, or 30).

## CREDENTIALS FOR GEM SOURCES

Bundler allows you to configure credentials for any gem source, which allows
you to avoid putting secrets into your Gemfile.

    bundle config set --global SOURCE_HOSTNAME USERNAME:PASSWORD

For example, to save the credentials of user `claudette` for the gem source at
`gems.longerous.com`, you would run:

    bundle config set --global gems.longerous.com claudette:s00pers3krit

Or you can set the credentials as an environment variable like this:

    export BUNDLE_GEMS__LONGEROUS__COM="claudette:s00pers3krit"

For gems with a git source with HTTP(S) URL you can specify credentials like so:

    bundle config set --global https://github.com/rubygems/rubygems.git username:password

Or you can set the credentials as an environment variable like so:

    export BUNDLE_GITHUB__COM=username:password

This is especially useful for private repositories on hosts such as GitHub,
where you can use personal OAuth tokens:

    export BUNDLE_GITHUB__COM=abcd0123generatedtoken:x-oauth-basic

Note that any configured credentials will be redacted by informative commands
such as `bundle config list` or `bundle config get`, unless you use the
`--parseable` flag. This is to avoid unintentionally leaking credentials when
copy-pasting bundler output.

Also note that to guarantee a sane mapping between valid environment variable
names and valid host names, bundler makes the following transformations:

* Any `-` characters in a host name are mapped to a triple dash (`___`) in the
  corresponding environment variable.

* Any `.` characters in a host name are mapped to a double dash (`__`) in the
  corresponding environment variable.

This means that if you have a gem server named `my.gem-host.com`, you'll need to
use the `BUNDLE_MY__GEM___HOST__COM` variable to configure credentials for it
through ENV.

## CONFIGURE BUNDLER DIRECTORIES

Bundler's home, config, cache and plugin directories are able to be configured
through environment variables. The default location for Bundler's home directory is
`~/.bundle`, which all directories inherit from by default. The following
outlines the available environment variables and their default values

    BUNDLE_USER_HOME : $HOME/.bundle
    BUNDLE_USER_CACHE : $BUNDLE_USER_HOME/cache
    BUNDLE_USER_CONFIG : $BUNDLE_USER_HOME/config
    BUNDLE_USER_PLUGIN : $BUNDLE_USER_HOME/plugin