Ubuntu Manpage: bundle-install - Install the dependencies specified in your Gemfile

NAME

       bundle-install - Install the dependencies specified in your Gemfile

SYNOPSIS

       bundle install [--binstubs[=DIRECTORY]] [--clean] [--deployment] [--frozen] [--full-index]
       [--gemfile=GEMFILE] [--jobs=NUMBER]  [--local]  [--no-cache]  [--no-prune]  [--path  PATH]
       [--quiet]  [--redownload]  [--retry=NUMBER]  [--shebang] [--standalone[=GROUP[ GROUP...]]]
       [--system] [--trust-policy=POLICY] [--with=GROUP[ GROUP...]] [--without=GROUP[ GROUP...]]

DESCRIPTION

       Install the gems specified in your Gemfile(5). If this is the first time  you  run  bundle
       install  (and  a  Gemfile.lock  does  not  exist),  Bundler will fetch all remote sources,
       resolve dependencies and install all needed gems.

       If a Gemfile.lock does exist, and you have not updated your Gemfile(5), Bundler will fetch
       all  remote  sources,  but  use  the dependencies specified in the Gemfile.lock instead of
       resolving dependencies.

       If a Gemfile.lock does exist, and you have updated your Gemfile(5), Bundler will  use  the
       dependencies in the Gemfile.lock for all gems that you did not update, but will re-resolve
       the dependencies of gems that you did update. You can find  more  information  about  this
       update process below under CONSERVATIVE UPDATING.

OPTIONS

The --clean, --deployment, --frozen, --no-prune, --path, --shebang, --system, --without
and --with options are deprecated because they only make sense if they are applied to
every subsequent bundle install run automatically and that requires bundler to silently
remember them. Since bundler will no longer remember CLI flags in future versions, bundle
config (see bundle-config(1)) should be used to apply them permanently.

--binstubs[=<directory>]
Binstubs are scripts that wrap around executables. Bundler creates a small Ruby
file (a binstub) that loads Bundler, runs the command, and puts it in bin/. This
lets you link the binstub inside of an application to the exact gem version the
application needs.

Creates a directory (defaults to ~/bin) and places 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.

--clean
On finishing the installation Bundler is going to remove any gems not present in
the current Gemfile(5). Don´t worry, gems currently in use will not be removed.

This option is deprecated in favor of the clean setting.

--deployment
In deployment mode, Bundler will ´roll-out´ the bundle for production or CI use.
Please check carefully if you want to have this option enabled in your development
environment.

This option is deprecated in favor of the deployment setting.

--redownload
Force download every gem, even if the required versions are already available
locally.

--frozen
Do not allow the Gemfile.lock to be updated after this install. Exits non-zero if
there are going to be changes to the Gemfile.lock.

This option is deprecated in favor of the frozen setting.

--full-index
Bundler will not call Rubygems´ API endpoint (default) but download and cache a
(currently big) index file of all gems. Performance can be improved for large
bundles that seldom change by enabling this option.

--gemfile=<gemfile>
The location of the Gemfile(5) which Bundler should use. This defaults to a
Gemfile(5) in the current working directory. In general, Bundler will assume that
the location of the Gemfile(5) is also the project´s root and will try to find
Gemfile.lock and vendor/cache relative to this location.

--jobs=[<number>], -j[<number>]
The maximum number of parallel download and install jobs. The default is the number
of available processors.

--local
Do not attempt to connect to rubygems.org. Instead, Bundler will use the gems
already present in Rubygems´ cache or in vendor/cache. Note that if an appropriate
platform-specific gem exists on rubygems.org it will not be found.

--prefer-local
Force using locally installed gems, or gems already present in Rubygems´ cache or
in vendor/cache, when resolving, even if newer versions are available remotely.
Only attempt to connect to rubygems.org for gems that are not present locally.

--no-cache
Do not update the cache in vendor/cache with the newly bundled gems. This does not
remove any gems in the cache but keeps the newly bundled gems from being cached
during the install.

--no-prune
Don´t remove stale gems from the cache when the installation finishes.

This option is deprecated in favor of the no_prune setting.

--path=<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.

This option is deprecated in favor of the path setting.

--quiet
Do not print progress information to the standard output. Instead, Bundler will
exit using a status code ($?).

--retry=[<number>]
Retry failed network or git requests for number times.

--shebang=<ruby-executable>
Uses the specified ruby executable (usually ruby) to execute the scripts created
with --binstubs. In addition, if you use --binstubs together with --shebang jruby
these executables will be changed to execute jruby instead.

This option is deprecated in favor of the shebang setting.

--standalone[=<list>]
Makes a bundle that can work without depending on Rubygems or Bundler at runtime. A
space separated list of groups to install has to be specified. Bundler creates a
directory named bundle and installs the bundle there. It also generates a
bundle/bundler/setup.rb file to replace Bundler´s own setup in the manner required.
Using this option implicitly sets path, which is a [remembered option][REMEMBERED
OPTIONS].

--system
Installs the gems specified in the bundle to the system´s Rubygems location. This
overrides any previous configuration of --path.

This option is deprecated in favor of the system setting.

--trust-policy=[<policy>]
Apply the Rubygems security policy policy, where policy is one of HighSecurity,
MediumSecurity, LowSecurity, AlmostNoSecurity, or NoSecurity. For more details,
please see the Rubygems signing documentation linked below in SEE ALSO.

--with=<list>
A space-separated list of groups referencing gems to install. If an optional group
is given it is installed. If a group is given that is in the remembered list of
groups given to --without, it is removed from that list.

This option is deprecated in favor of the with setting.

--without=<list>
A space-separated list of groups referencing gems to skip during installation. If a
group is given that is in the remembered list of groups given to --with, it is
removed from that list.

This option is deprecated in favor of the without setting.

DEPLOYMENT MODE

Bundler´s defaults are optimized for development. To switch to defaults optimized for
deployment and for CI, use the --deployment flag. Do not activate deployment mode on
development machines, as it will cause an error when the Gemfile(5) is modified.

1. A Gemfile.lock is required.

To ensure that the same versions of the gems you developed with and tested with are
also used in deployments, a Gemfile.lock is required.

This is mainly to ensure that you remember to check your Gemfile.lock into version
control.

2. The Gemfile.lock must be up to date

In development, you can modify your Gemfile(5) and re-run bundle install to
conservatively update your Gemfile.lock snapshot.

In deployment, your Gemfile.lock should be up-to-date with changes made in your
Gemfile(5).

3. Gems are installed to vendor/bundle not your default system location

In development, it´s convenient to share the gems used in your application with other
applications and other scripts that run on the system.

In deployment, isolation is a more important default. In addition, the user deploying
the application may not have permission to install gems to the system, or the web
server may not have permission to read them.

As a result, bundle install --deployment installs gems to the vendor/bundle directory
in the application. This may be overridden using the --path option.

INSTALLING GROUPS

By default, bundle install will install all gems in all groups in your Gemfile(5), except
those declared for a different platform.

However, you can explicitly tell Bundler to skip installing certain groups with the
--without option. This option takes a space-separated list of groups.

While the --without option will skip installing the gems in the specified groups, it will
still download those gems and use them to resolve the dependencies of every gem in your
Gemfile(5).

This is so that installing a different set of groups on another machine (such as a
production server) will not change the gems and versions that you have already developed
and tested against.

Bundler offers a rock-solid guarantee that the third-party code you are running in
development and testing is also the third-party code you are running in production. You
can choose to exclude some of that code in different environments, but you will never be
caught flat-footed by different versions of third-party code being used in different
environments.

For a simple illustration, consider the following Gemfile(5):

source ´https://rubygems.org´

gem ´sinatra´

group :production do
gem ´rack-perftools-profiler´
end

In this case, sinatra depends on any version of Rack (>= 1.0), while
rack-perftools-profiler depends on 1.x (~> 1.0).

When you run bundle install --without production in development, we look at the
dependencies of rack-perftools-profiler as well. That way, you do not spend all your time
developing against Rack 2.0, using new APIs unavailable in Rack 1.x, only to have Bundler
switch to Rack 1.2 when the production group is used.

This should not cause any problems in practice, because we do not attempt to install the
gems in the excluded groups, and only evaluate as part of the dependency resolution
process.

This also means that you cannot include different versions of the same gem in different
groups, because doing so would result in different sets of dependencies used in
development and production. Because of the vagaries of the dependency resolution process,
this usually affects more than the gems you list in your Gemfile(5), and can
(surprisingly) radically change the gems you are using.

THE GEMFILE.LOCK

When you run bundle install, Bundler will persist the full names and versions of all gems
that you used (including dependencies of the gems specified in the Gemfile(5)) into a file
called Gemfile.lock.

Bundler uses this file in all subsequent calls to bundle install, which guarantees that
you always use the same exact code, even as your application moves across machines.

Because of the way dependency resolution works, even a seemingly small change (for
instance, an update to a point-release of a dependency of a gem in your Gemfile(5)) can
result in radically different gems being needed to satisfy all dependencies.

As a result, you SHOULD check your Gemfile.lock into version control, in both applications
and gems. If you do not, every machine that checks out your repository (including your
production server) will resolve all dependencies again, which will result in different
versions of third-party code being used if any of the gems in the Gemfile(5) or any of
their dependencies have been updated.

When Bundler first shipped, the Gemfile.lock was included in the .gitignore file included
with generated gems. Over time, however, it became clear that this practice forces the
pain of broken dependencies onto new contributors, while leaving existing contributors
potentially unaware of the problem. Since bundle install is usually the first step towards
a contribution, the pain of broken dependencies would discourage new contributors from
contributing. As a result, we have revised our guidance for gem authors to now recommend
checking in the lock for gems.

CONSERVATIVE UPDATING

When you make a change to the Gemfile(5) and then run bundle install, Bundler will update
only the gems that you modified.

In other words, if a gem that you did not modify worked before you called bundle install,
it will continue to use the exact same versions of all dependencies as it used before the
update.

Let´s take a look at an example. Here´s your original Gemfile(5):

source ´https://rubygems.org´

gem ´actionpack´, ´2.3.8´
gem ´activemerchant´

In this case, both actionpack and activemerchant depend on activesupport. The actionpack
gem depends on activesupport 2.3.8 and rack ~> 1.1.0, while the activemerchant gem depends
on activesupport >= 2.3.2, braintree >= 2.0.0, and builder >= 2.0.0.

When the dependencies are first resolved, Bundler will select activesupport 2.3.8, which
satisfies the requirements of both gems in your Gemfile(5).

Next, you modify your Gemfile(5) to:

source ´https://rubygems.org´

gem ´actionpack´, ´3.0.0.rc´
gem ´activemerchant´

The actionpack 3.0.0.rc gem has a number of new dependencies, and updates the
activesupport dependency to = 3.0.0.rc and the rack dependency to ~> 1.2.1.

When you run bundle install, Bundler notices that you changed the actionpack gem, but not
the activemerchant gem. It evaluates the gems currently being used to satisfy its
requirements:

activesupport 2.3.8
also used to satisfy a dependency in activemerchant, which is not being updated

rack ~> 1.1.0
not currently being used to satisfy another dependency

Because you did not explicitly ask to update activemerchant, you would not expect it to
suddenly stop working after updating actionpack. However, satisfying the new activesupport
3.0.0.rc dependency of actionpack requires updating one of its dependencies.

Even though activemerchant declares a very loose dependency that theoretically matches
activesupport 3.0.0.rc, Bundler treats gems in your Gemfile(5) that have not changed as an
atomic unit together with their dependencies. In this case, the activemerchant dependency
is treated as activemerchant 1.7.1 + activesupport 2.3.8, so bundle install will report
that it cannot update actionpack.

To explicitly update actionpack, including its dependencies which other gems in the
Gemfile(5) still depend on, run bundle update actionpack (see bundle update(1)).

Summary: In general, after making a change to the Gemfile(5) , you should first try to run
bundle install, which will guarantee that no other gem in the Gemfile(5) is impacted by
the change. If that does not work, run bundle update(1) bundle-update.1.html.