File: bundle-install.txt [bundler-1.10.3 Documentation]

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

NAME

    bundle-install - Install the dependencies specified in your Gemfile

SYNOPSIS

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

    --binstubs[=<directory>]
           Creates  a  directory (defaults to ~/bin) and place 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.

    --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 seldomly 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>]
           Install gems by starting number of workers parallely.

    --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.

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

    --system
           Installs  the  gems  specified  in  the  bundle  to the system's
           Rubygems location. This overrides any previous remembered use of
           --path.

    --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. Accodingly, gems installed to other  locations
           will not get listed. This setting is a remembered option.

    --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.

    --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.

    --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 is
           a remembered option.

    --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 is a remembered option.

DEPLOYMENT MODE

    Bundler's defaults are optimized for development. To switch to defaults
    optimized for deployment, 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 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 them 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 actually 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 just the gems you list in your Gemfile(5), and can  (surpris-
    ingly) radically change the gems you are using.

REMEMBERED OPTIONS

    Some  options  (marked  above  in  the  OPTIONS section) are remembered
    between calls to bundle install, and by the Bundler runtime.

    For instance, if you run bundle install --without  test,  a  subsequent
    call  to  bundle  install  that  does not include a --without flag will
    remember your previous choice.

    In addition, a call to Bundler.setup will not attempt to make the  gems
    in  those  groups  available  on  the  Ruby load path, as they were not
    installed.

    The settings that are remembered are:

    --deployment
           At runtime, this remembered setting will also result in  Bundler
           raising an exception if the Gemfile.lock is out of date.

    --path Subsequent  calls  to  bundle  install  will install gems to the
           directory originally passed to --path. The Bundler runtime  will
           look  for  gems  in that location. You can revert this option by
           running bundle install --system.

    --binstubs
           Bundler will update the executables  every  subsequent  call  to
           bundle install.

    --without
           As  described  above,  Bundler  will  skip the gems specified by
           --without in subsequent calls to  bundle  install.  The  Bundler
           runtime will also not try to make the gems in the skipped groups
           available.

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.
    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.

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  gems  in the Gemfile(5) are 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/

                                May 2015                  BUNDLE-INSTALL(1)

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