Provided by: ruby2.7_2.7.0-5ubuntu1.18_amd64 
NAME
bundle-config - Set bundler configuration options
SYNOPSIS
bundle config [list|get|set|unset] [name [value]]
DESCRIPTION
This command allows you to interact with Bundler´s configuration system.
Bundler loads configuration settings in this order:
1. Local config (app/.bundle/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> 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 set --global <name> <value> works the same as above.
Executing bundle config set --local <name> <value> will set that configuration to the local application.
The configuration will be stored in app/.bundle/config.
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> <value> 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.
Executing bundle config set disable_multisource true upgrades the warning about the Gemfile containing
multiple primary sources to an error. Executing bundle config unset disable_multisource downgrades this
error to a warning.
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 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.
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 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 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_bundler_dependency_conflicts (BUNDLE_ALLOW_BUNDLER_DEPENDENCY_CONFLICTS): Allow resolving to
specifications that have dependencies on bundler that are incompatible with the running Bundler
version.
• 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.
• 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
bundle package, 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_multisource (BUNDLE_DISABLE_MULTISOURCE): When set, Gemfiles containing multiple sources will
produce errors instead of warnings. Use bundle config unset disable_multisource to unset.
• disable_platform_warnings (BUNDLE_DISABLE_PLATFORM_WARNINGS): Disable warnings during bundle install
when a dependency is unused on the current platform.
• 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.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_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 1.
• 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_update_to_newer_versions (BUNDLE_ONLY_UPDATE_TO_NEWER_VERSIONS): During bundle update, only
resolve to newer versions of the gems in the lockfile.
• 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.
• skip_default_git_sources (BUNDLE_SKIP_DEFAULT_GIT_SOURCES): Whether Bundler should skip adding
default git source shortcuts to the Gemfile DSL.
• specific_platform (BUNDLE_SPECIFIC_PLATFORM): Allow bundler to resolve for the specific running
platform and store it in the lockfile, instead of only using a generic platform. A specific platform
is the exact platform triple reported by Gem::Platform.local, such as x86_64-darwin-16 or
universal-java-1.8. On the other hand, generic platforms are those such as ruby, mswin, or java. In
this example, x86_64-darwin-16 would map to ruby and universal-java-1.8 to java.
• 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.
• unlock_source_unlocks_spec (BUNDLE_UNLOCK_SOURCE_UNLOCKS_SPEC): Whether running bundle update
--source NAME unlocks a gem with the given name. Defaults to true.
• 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 package(1) bundle-package.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.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.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 mirror.SOURCE_URL MIRROR_URL
For example, to use a mirror of rubygems.org hosted at rubygems-mirror.org:
bundle config set mirror.http://rubygems.org http://rubygems-mirror.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 mirror.SOURCE_URL.fallback_timeout TIMEOUT
For example, to fall back to rubygems.org after 3 seconds:
bundle config set 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 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 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 https://github.com/bundler/bundler.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
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
December 2019 BUNDLE-CONFIG(1)