ruby/man/bundle-install.1.txt

BUNDLE-INSTALL(1)					     BUNDLE-INSTALL(1)



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...]]]  [--sys-
       tem]   [--trust-policy=POLICY]	[--with=GROUP[	 GROUP...]]   [--with-
       out=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	speci-
       fied 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
       To  apply  any  of --binstubs, --deployment, --path, or --without every
       time bundle install is run, use bundle config (see bundle-config(1)).

       --binstubs[=<directory>]
	      Binstubs are scripts that wrap around executables. Bundler  cre-
	      ates  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 applica-
	      tion needs.

	      Creates a directory (defaults to ~/bin) and places any  executa-
	      bles from the gem there. These executables run in Bundler's con-
	      text. If used, you might add this  directory  to	your  environ-
	      ment'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.

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

       --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  Gem-
	      file.lock.

       --full-index
	      Bundler will not call Rubygems' API endpoint (default) but down-
	      load and cache a (currently big) index file of all gems. Perfor-
	      mance  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 1.

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

       --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.

       --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.

       --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	--bin-
	      stubs  together  with  --shebang jruby these executables will be
	      changed to execute jruby instead.

       --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  bun-
	      dle/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.

       --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.

       --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.

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 Gem-
	   file.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  loca-
	   tion

	   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 permis-
	   sion to read them.

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



SUDO USAGE
       By default, Bundler installs gems to the same location as gem install.

       In some cases, that location may not be writable by your Unix user.  In
       that case, Bundler will stage everything in a temporary directory, then
       ask you for your sudo password in order to copy	the  gems  into  their
       system location.

       From  your  perspective,  this  is  identical  to  installing  the gems
       directly into the system.

       You should never use sudo bundle install. This is because several other
       steps in bundle install must be performed as the current user:

       o   Updating your Gemfile.lock

       o   Updating your vendor/cache, if necessary

       o   Checking out private git repositories using your user's SSH keys



       Of  these  three,  the  first  two  could theoretically be performed by
       chowning the resulting files to $SUDO_USER.  The  third,  however,  can
       only  be  performed  by	invoking  the git command as the current user.
       Therefore, git gems are downloaded and installed into ~/.bundle	rather
       than $GEM_HOME or $BUNDLE_PATH.

       As  a  result,  you  should run bundle install as the current user, and
       Bundler will ask for your password if it is needed to put the gems into
       their final location.

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	speci-
       fied  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 environ-
       ments.

       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 appli-
       cation 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 .git-
       ignore 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  discour-
       age  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  activesup-
       port.  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	depen-
       dency 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. How-
       ever, satisfying the new activesupport 3.0.0.rc dependency  of  action-
       pack requires updating one of its dependencies.

       Even  though activemerchant declares a very loose dependency that theo-
       retically 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.

SEE ALSO
       o   Gem				 install			  docs
	   http://guides.rubygems.org/rubygems-basics/#installing-gems

       o   Rubygems signing docs http://guides.rubygems.org/security/






				 January 2020		     BUNDLE-INSTALL(1)