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ruby--ruby/man/gemfile.5.txt
hsbt fc9509bdd2 Merge bundler-2.0.0.pre.2 from upstream. 
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@66036 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
2018-11-27 12:08:19 +00:00

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GEMFILE(5) GEMFILE(5)
1mNAME0m
1mGemfile 22m- A format for describing gem dependencies for Ruby programs
1mSYNOPSIS0m
A 1mGemfile 22mdescribes the gem dependencies required to execute associated
Ruby code.
Place the 1mGemfile 22min the root of the directory containing the associ-
ated code. For instance, in a Rails application, place the 1mGemfile 22min
the same directory as the 1mRakefile22m.
1mSYNTAX0m
A 1mGemfile 22mis evaluated as Ruby code, in a context which makes available
a number of methods used to describe the gem requirements.
1mGLOBAL SOURCES0m
At the top of the 1mGemfile22m, add a line for the 1mRubygems 22msource that con-
tains the gems listed in the 1mGemfile22m.
source "https://rubygems.org"
It is possible, but not recommended as of Bundler 1.7, to add multiple
global 1msource 22mlines. Each of these 1msource22ms 1mMUST 22mbe a valid Rubygems
repository.
Sources are checked for gems following the heuristics described in
4mSOURCE24m 4mPRIORITY24m. If a gem is found in more than one global source,
Bundler will print a warning after installing the gem indicating which
source was used, and listing the other sources where the gem is avail-
able. A specific source can be selected for gems that need to use a
non-standard repository, suppressing this warning, by using the 1m:source0m
option or a 1msource 22mblock.
1mCREDENTIALS0m
Some gem sources require a username and password. Use bundle config(1)
4mbundle-config.1.html24m to set the username and password for any of the
sources that need it. The command must be run once on each computer
that will install the Gemfile, but this keeps the credentials from
being stored in plain text in version control.
bundle config gems.example.com user:password
For some sources, like a company Gemfury account, it may be easier to
include the credentials in the Gemfile as part of the source URL.
source "https://user:password@gems.example.com"
Credentials in the source URL will take precedence over credentials set
using 1mconfig22m.
1mRUBY0m
If your application requires a specific Ruby version or engine, specify
your requirements using the 1mruby 22mmethod, with the following arguments.
All parameters are 1mOPTIONAL 22munless otherwise specified.
1mVERSION (required)0m
The version of Ruby that your application requires. If your application
requires an alternate Ruby engine, such as JRuby, Rubinius or Truf-
fleRuby, this should be the Ruby version that the engine is compatible
with.
ruby "1.9.3"
1mENGINE0m
Each application 4mmay24m specify a Ruby engine. If an engine is specified,
an engine version 4mmust24m also be specified.
What exactly is an Engine? - A Ruby engine is an implementation of the
Ruby language.
o For background: the reference or original implementation of the
Ruby programming language is called Matz's Ruby Interpreter
4mhttps://en.wikipedia.org/wiki/Ruby_MRI24m, or MRI for short. This is
named after Ruby creator Yukihiro Matsumoto, also known as Matz.
MRI is also known as CRuby, because it is written in C. MRI is the
most widely used Ruby engine.
o Other implementations 4mhttps://www.ruby-lang.org/en/about/24m of Ruby
exist. Some of the more well-known implementations include Rubinius
4mhttps://rubinius.com/24m, and JRuby 4mhttp://jruby.org/24m. Rubinius is an
alternative implementation of Ruby written in Ruby. JRuby is an
implementation of Ruby on the JVM, short for Java Virtual Machine.
1mENGINE VERSION0m
Each application 4mmay24m specify a Ruby engine version. If an engine ver-
sion is specified, an engine 4mmust24m also be specified. If the engine is
"ruby" the engine version specified 4mmust24m match the Ruby version.
ruby "1.8.7", :engine => "jruby", :engine_version => "1.6.7"
1mPATCHLEVEL0m
Each application 4mmay24m specify a Ruby patchlevel.
ruby "2.0.0", :patchlevel => "247"
1mGEMS0m
Specify gem requirements using the 1mgem 22mmethod, with the following argu-
ments. All parameters are 1mOPTIONAL 22munless otherwise specified.
1mNAME (required)0m
For each gem requirement, list a single 4mgem24m line.
gem "nokogiri"
1mVERSION0m
Each 4mgem24m 1mMAY 22mhave one or more version specifiers.
gem "nokogiri", ">= 1.4.2"
gem "RedCloth", ">= 4.1.0", "< 4.2.0"
1mREQUIRE AS0m
Each 4mgem24m 1mMAY 22mspecify files that should be used when autorequiring via
1mBundler.require22m. You may pass an array with multiple files or 1mtrue 22mif
file you want 1mrequired 22mhas same name as 4mgem24m or 1mfalse 22mto prevent any
file from being autorequired.
gem "redis", :require => ["redis/connection/hiredis", "redis"]
gem "webmock", :require => false
gem "debugger", :require => true
The argument defaults to the name of the gem. For example, these are
identical:
gem "nokogiri"
gem "nokogiri", :require => "nokogiri"
gem "nokogiri", :require => true
1mGROUPS0m
Each 4mgem24m 1mMAY 22mspecify membership in one or more groups. Any 4mgem24m that
does not specify membership in any group is placed in the 1mdefault0m
group.
gem "rspec", :group => :test
gem "wirble", :groups => [:development, :test]
The Bundler runtime allows its two main methods, 1mBundler.setup 22mand
1mBundler.require22m, to limit their impact to particular groups.
# setup adds gems to Ruby's load path
Bundler.setup # defaults to all groups
require "bundler/setup" # same as Bundler.setup
Bundler.setup(:default) # only set up the _default_ group
Bundler.setup(:test) # only set up the _test_ group (but `not` _default_)
Bundler.setup(:default, :test) # set up the _default_ and _test_ groups, but no others
# require requires all of the gems in the specified groups
Bundler.require # defaults to the _default_ group
Bundler.require(:default) # identical
Bundler.require(:default, :test) # requires the _default_ and _test_ groups
Bundler.require(:test) # requires the _test_ group
The Bundler CLI allows you to specify a list of groups whose gems 1mbun-0m
1mdle install 22mshould not install with the 1m--without 22moption. To specify
multiple groups to ignore, specify a list of groups separated by spa-
ces.
bundle install --without test
bundle install --without development test
After running 1mbundle install --without test22m, bundler will remember that
you excluded the test group in the last installation. The next time you
run 1mbundle install22m, without any 1m--without option22m, bundler will recall
it.
Also, calling 1mBundler.setup 22mwith no parameters, or calling 1mrequire0m
1m"bundler/setup" 22mwill setup all groups except for the ones you excluded
via 1m--without 22m(since they are not available).
Note that on 1mbundle install22m, bundler downloads and evaluates all gems,
in order to create a single canonical list of all of the required gems
and their dependencies. This means that you cannot list different ver-
sions of the same gems in different groups. For more details, see
Understanding Bundler 4mhttp://bundler.io/rationale.html24m.
1mPLATFORMS0m
If a gem should only be used in a particular platform or set of plat-
forms, you can specify them. Platforms are essentially identical to
groups, except that you do not need to use the 1m--without 22minstall-time
flag to exclude groups of gems for other platforms.
There are a number of 1mGemfile 22mplatforms:
1mruby 22mC Ruby (MRI), Rubinius or TruffleRuby, but 1mNOT 22mWindows
1mmri 22mSame as 4mruby24m, but only C Ruby (MRI)
1mmingw 22mWindows 32 bit 'mingw32' platform (aka RubyInstaller)
1mx64_mingw0m
Windows 64 bit 'mingw32' platform (aka RubyInstaller x64)
1mrbx 22mRubinius
1mjruby 22mJRuby
1mtruffleruby0m
TruffleRuby
1mmswin 22mWindows
You can restrict further by platform and version for all platforms
4mexcept24m for 1mrbx22m, 1mjruby22m, 1mtruffleruby 22mand 1mmswin22m.
To specify a version in addition to a platform, append the version num-
ber without the delimiter to the platform. For example, to specify that
a gem should only be used on platforms with Ruby 2.3, use:
ruby_23
The full list of platforms and supported versions includes:
1mruby 22m1.8, 1.9, 2.0, 2.1, 2.2, 2.3, 2.4, 2.5
1mmri 22m1.8, 1.9, 2.0, 2.1, 2.2, 2.3, 2.4, 2.5
1mmingw 22m1.8, 1.9, 2.0, 2.1, 2.2, 2.3, 2.4, 2.5
1mx64_mingw0m
2.0, 2.1, 2.2, 2.3, 2.4, 2.5
As with groups, you can specify one or more platforms:
gem "weakling", :platforms => :jruby
gem "ruby-debug", :platforms => :mri_18
gem "nokogiri", :platforms => [:mri_18, :jruby]
All operations involving groups (1mbundle install 4m22mbundle-install.1.html24m,
1mBundler.setup22m, 1mBundler.require22m) behave exactly the same as if any
groups not matching the current platform were explicitly excluded.
1mSOURCE0m
You can select an alternate Rubygems repository for a gem using the
':source' option.
gem "some_internal_gem", :source => "https://gems.example.com"
This forces the gem to be loaded from this source and ignores any
global sources declared at the top level of the file. If the gem does
not exist in this source, it will not be installed.
Bundler will search for child dependencies of this gem by first looking
in the source selected for the parent, but if they are not found there,
it will fall back on global sources using the ordering described in
4mSOURCE24m 4mPRIORITY24m.
Selecting a specific source repository this way also suppresses the
ambiguous gem warning described above in 4mGLOBAL24m 4mSOURCES24m 4m(#source)24m.
Using the 1m:source 22moption for an individual gem will also make that
source available as a possible global source for any other gems which
do not specify explicit sources. Thus, when adding gems with explicit
sources, it is recommended that you also ensure all other gems in the
Gemfile are using explicit sources.
1mGIT0m
If necessary, you can specify that a gem is located at a particular git
repository using the 1m:git 22mparameter. The repository can be accessed via
several protocols:
1mHTTP(S)0m
gem "rails", :git => "https://github.com/rails/rails.git"
1mSSH 22mgem "rails", :git => "git@github.com:rails/rails.git"
1mgit 22mgem "rails", :git => "git://github.com/rails/rails.git"
If using SSH, the user that you use to run 1mbundle install MUST 22mhave the
appropriate keys available in their 1m$HOME/.ssh22m.
1mNOTE22m: 1mhttp:// 22mand 1mgit:// 22mURLs should be avoided if at all possible.
These protocols are unauthenticated, so a man-in-the-middle attacker
can deliver malicious code and compromise your system. HTTPS and SSH
are strongly preferred.
The 1mgroup22m, 1mplatforms22m, and 1mrequire 22moptions are available and behave
exactly the same as they would for a normal gem.
A git repository 1mSHOULD 22mhave at least one file, at the root of the
directory containing the gem, with the extension 1m.gemspec22m. This file
1mMUST 22mcontain a valid gem specification, as expected by the 1mgem build0m
command.
If a git repository does not have a 1m.gemspec22m, bundler will attempt to
create one, but it will not contain any dependencies, executables, or C
extension compilation instructions. As a result, it may fail to prop-
erly integrate into your application.
If a git repository does have a 1m.gemspec 22mfor the gem you attached it
to, a version specifier, if provided, means that the git repository is
only valid if the 1m.gemspec 22mspecifies a version matching the version
specifier. If not, bundler will print a warning.
gem "rails", "2.3.8", :git => "https://github.com/rails/rails.git"
# bundle install will fail, because the .gemspec in the rails
# repository's master branch specifies version 3.0.0
If a git repository does 1mnot 22mhave a 1m.gemspec 22mfor the gem you attached
it to, a version specifier 1mMUST 22mbe provided. Bundler will use this ver-
sion in the simple 1m.gemspec 22mit creates.
Git repositories support a number of additional options.
1mbranch22m, 1mtag22m, and 1mref0m
You 1mMUST 22monly specify at most one of these options. The default
is 1m:branch => "master"0m
For example:
git "https://github.com/rails/rails.git", :branch => "5-0-sta-
ble" do
git "https://github.com/rails/rails.git", :tag => "v5.0.0" do
git "https://github.com/rails/rails.git", :ref => "4aded" do
1msubmodules0m
For reference, a git submodule
4mhttps://git-scm.com/book/en/v2/Git-Tools-Submodules24m lets you
have another git repository within a subfolder of your reposi-
tory. Specify 1m:submodules => true 22mto cause bundler to expand any
submodules included in the git repository
If a git repository contains multiple 1m.gemspecs22m, each 1m.gemspec 22mrepre-
sents a gem located at the same place in the file system as the 1m.gem-0m
1mspec22m.
|~rails [git root]
| |-rails.gemspec [rails gem located here]
|~actionpack
| |-actionpack.gemspec [actionpack gem located here]
|~activesupport
| |-activesupport.gemspec [activesupport gem located here]
|...
To install a gem located in a git repository, bundler changes to the
directory containing the gemspec, runs 1mgem build name.gemspec 22mand then
installs the resulting gem. The 1mgem build 22mcommand, which comes standard
with Rubygems, evaluates the 1m.gemspec 22min the context of the directory
in which it is located.
1mGIT SOURCE0m
A custom git source can be defined via the 1mgit_source 22mmethod. Provide
the source's name as an argument, and a block which receives a single
argument and interpolates it into a string to return the full repo
address:
git_source(:stash){ |repo_name| "https://stash.corp.acme.pl/#{repo_name}.git" }
gem 'rails', :stash => 'forks/rails'
In addition, if you wish to choose a specific branch:
gem "rails", :stash => "forks/rails", :branch => "branch_name"
1mGITHUB0m
1mNOTE22m: This shorthand should be avoided until Bundler 2.0, since it cur-
rently expands to an insecure 1mgit:// 22mURL. This allows a man-in-the-mid-
dle attacker to compromise your system.
If the git repository you want to use is hosted on GitHub and is pub-
lic, you can use the :github shorthand to specify the github username
and repository name (without the trailing ".git"), separated by a
slash. If both the username and repository name are the same, you can
omit one.
gem "rails", :github => "rails/rails"
gem "rails", :github => "rails"
Are both equivalent to
gem "rails", :git => "git://github.com/rails/rails.git"
Since the 1mgithub 22mmethod is a specialization of 1mgit_source22m, it accepts a
1m:branch 22mnamed argument.
1mGIST0m
If the git repository you want to use is hosted as a Github Gist and is
public, you can use the :gist shorthand to specify the gist identifier
(without the trailing ".git").
gem "the_hatch", :gist => "4815162342"
Is equivalent to:
gem "the_hatch", :git => "https://gist.github.com/4815162342.git"
Since the 1mgist 22mmethod is a specialization of 1mgit_source22m, it accepts a
1m:branch 22mnamed argument.
1mBITBUCKET0m
If the git repository you want to use is hosted on Bitbucket and is
public, you can use the :bitbucket shorthand to specify the bitbucket
username and repository name (without the trailing ".git"), separated
by a slash. If both the username and repository name are the same, you
can omit one.
gem "rails", :bitbucket => "rails/rails"
gem "rails", :bitbucket => "rails"
Are both equivalent to
gem "rails", :git => "https://rails@bitbucket.org/rails/rails.git"
Since the 1mbitbucket 22mmethod is a specialization of 1mgit_source22m, it
accepts a 1m:branch 22mnamed argument.
1mPATH0m
You can specify that a gem is located in a particular location on the
file system. Relative paths are resolved relative to the directory con-
taining the 1mGemfile22m.
Similar to the semantics of the 1m:git 22moption, the 1m:path 22moption requires
that the directory in question either contains a 1m.gemspec 22mfor the gem,
or that you specify an explicit version that bundler should use.
Unlike 1m:git22m, bundler does not compile C extensions for gems specified
as paths.
gem "rails", :path => "vendor/rails"
If you would like to use multiple local gems directly from the filesys-
tem, you can set a global 1mpath 22moption to the path containing the gem's
files. This will automatically load gemspec files from subdirectories.
path 'components' do
gem 'admin_ui'
gem 'public_ui'
end
1mBLOCK FORM OF SOURCE, GIT, PATH, GROUP and PLATFORMS0m
The 1m:source22m, 1m:git22m, 1m:path22m, 1m:group22m, and 1m:platforms 22moptions may be applied
to a group of gems by using block form.
source "https://gems.example.com" do
gem "some_internal_gem"
gem "another_internal_gem"
end
git "https://github.com/rails/rails.git" do
gem "activesupport"
gem "actionpack"
end
platforms :ruby do
gem "ruby-debug"
gem "sqlite3"
end
group :development, :optional => true do
gem "wirble"
gem "faker"
end
In the case of the group block form the :optional option can be given
to prevent a group from being installed unless listed in the 1m--with0m
option given to the 1mbundle install 22mcommand.
In the case of the 1mgit 22mblock form, the 1m:ref22m, 1m:branch22m, 1m:tag22m, and 1m:sub-0m
1mmodules 22moptions may be passed to the 1mgit 22mmethod, and all gems in the
block will inherit those options.
The presence of a 1msource 22mblock in a Gemfile also makes that source
available as a possible global source for any other gems which do not
specify explicit sources. Thus, when defining source blocks, it is rec-
ommended that you also ensure all other gems in the Gemfile are using
explicit sources, either via source blocks or 1m:source 22mdirectives on
individual gems.
1mINSTALL_IF0m
The 1minstall_if 22mmethod allows gems to be installed based on a proc or
lambda. This is especially useful for optional gems that can only be
used if certain software is installed or some other conditions are met.
install_if -> { RUBY_PLATFORM =~ /darwin/ } do
gem "pasteboard"
end
1mGEMSPEC0m
The 1m.gemspec 4m22mhttp://guides.rubygems.org/specification-reference/24m file
is where you provide metadata about your gem to Rubygems. Some required
Gemspec attributes include the name, description, and homepage of your
gem. This is also where you specify the dependencies your gem needs to
run.
If you wish to use Bundler to help install dependencies for a gem while
it is being developed, use the 1mgemspec 22mmethod to pull in the dependen-
cies listed in the 1m.gemspec 22mfile.
The 1mgemspec 22mmethod adds any runtime dependencies as gem requirements in
the default group. It also adds development dependencies as gem
requirements in the 1mdevelopment 22mgroup. Finally, it adds a gem require-
ment on your project (1m:path => '.'22m). In conjunction with 1mBundler.setup22m,
this allows you to require project files in your test code as you would
if the project were installed as a gem; you need not manipulate the
load path manually or require project files via relative paths.
The 1mgemspec 22mmethod supports optional 1m:path22m, 1m:glob22m, 1m:name22m, and 1m:develop-0m
1mment_group 22moptions, which control where bundler looks for the 1m.gemspec22m,
the glob it uses to look for the gemspec (defaults to: "{,4m,24m/*}.gem-
spec"), what named 1m.gemspec 22mit uses (if more than one is present), and
which group development dependencies are included in.
When a 1mgemspec 22mdependency encounters version conflicts during resolu-
tion, the local version under development will always be selected --
even if there are remote versions that better match other requirements
for the 1mgemspec 22mgem.
1mSOURCE PRIORITY0m
When attempting to locate a gem to satisfy a gem requirement, bundler
uses the following priority order:
1. The source explicitly attached to the gem (using 1m:source22m, 1m:path22m, or
1m:git22m)
2. For implicit gems (dependencies of explicit gems), any source, git,
or path repository declared on the parent. This results in bundler
prioritizing the ActiveSupport gem from the Rails git repository
over ones from 1mrubygems.org0m
3. The sources specified via global 1msource 22mlines, searching each
source in your 1mGemfile 22mfrom last added to first added.
November 2018 GEMFILE(5)
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