From b5249432267a6086df2c39fa1c5c26c14db7d513 Mon Sep 17 00:00:00 2001
From: Steven Peters
Date: Mon, 16 Dec 2013 16:37:59 -0800
Subject: install: add --only-dependencies option

The traditional approach to installing the dependencies of a formula is
the following:

  brew install `brew deps formula`

This approach ignores any options that are specified in the parent
formula. This pull request adds a --only-dependencies option to brew
install that installs the dependencies of a formula with optional flags,
but returns before installing the parent formula.

Closes Homebrew/homebrew#25272.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>
---
 Library/Contributions/brew_bash_completion.sh |  1 +
 Library/Contributions/manpages/brew.1.md      |  5 ++++-
 Library/Homebrew/extend/ARGV.rb               |  4 ++++
 Library/Homebrew/formula_installer.rb         | 10 +++++++++-
 4 files changed, 18 insertions(+), 2 deletions(-)

(limited to 'Library')

diff --git a/Library/Contributions/brew_bash_completion.sh b/Library/Contributions/brew_bash_completion.sh
index 886c52ce3..b7bd830d7 100644
--- a/Library/Contributions/brew_bash_completion.sh
+++ b/Library/Contributions/brew_bash_completion.sh
@@ -235,6 +235,7 @@ _brew_install ()
                 --HEAD
                 --ignore-dependencies
                 --interactive
+                --only-dependencies
                 --verbose
                 $(brew options --compact "$prv" 2>/dev/null)
                 "
diff --git a/Library/Contributions/manpages/brew.1.md b/Library/Contributions/manpages/brew.1.md
index e64f9b34c..549e80562 100644
--- a/Library/Contributions/manpages/brew.1.md
+++ b/Library/Contributions/manpages/brew.1.md
@@ -151,7 +151,7 @@ Note that these flags should only appear after a command.
   * `info` <URL>:
     Print the name and version that will be detected for <URL>.
 
-  * `install [--debug] [--env=<std|super>] [--ignore-dependencies] [--fresh] [--cc=<compiler>] [--build-from-source] [--devel|--HEAD]` <formula>:
+  * `install [--debug] [--env=<std|super>] [--ignore-dependencies] [--only-dependencies] [--fresh] [--cc=<compiler>] [--build-from-source] [--devel|--HEAD]` <formula>:
     Install <formula>.
 
     <formula> is usually the name of the formula to install, but it can be specified
@@ -170,6 +170,9 @@ Note that these flags should only appear after a command.
     any kind. If they are not already present, the formula will probably fail
     to install.
 
+    If `--only-dependencies` is passed, install the dependencies with specified
+    options but do not install the specified formula.
+
     If `--fresh` is passed, the installation process will not re-use any
     options from previous installs.
 
diff --git a/Library/Homebrew/extend/ARGV.rb b/Library/Homebrew/extend/ARGV.rb
index 5aa90dbb9..c2e1a9c2e 100644
--- a/Library/Homebrew/extend/ARGV.rb
+++ b/Library/Homebrew/extend/ARGV.rb
@@ -102,6 +102,10 @@ module HomebrewArgvExtension
     include? '--ignore-dependencies'
   end
 
+  def only_deps?
+    include? '--only-dependencies'
+  end
+
   def json
     value 'json'
   end
diff --git a/Library/Homebrew/formula_installer.rb b/Library/Homebrew/formula_installer.rb
index a78fd0d13..8990b3afc 100644
--- a/Library/Homebrew/formula_installer.rb
+++ b/Library/Homebrew/formula_installer.rb
@@ -15,13 +15,14 @@ class FormulaInstaller
   include FormulaCellarChecks
 
   attr_reader :f
-  attr_accessor :tab, :options, :ignore_deps
+  attr_accessor :tab, :options, :ignore_deps, :only_deps
   attr_accessor :show_summary_heading, :show_header
 
   def initialize ff
     @f = ff
     @show_header = false
     @ignore_deps = ARGV.ignore_deps? || ARGV.interactive?
+    @only_deps = ARGV.only_deps?
     @options = Options.new
     @tab = Tab.dummy_tab(ff)
 
@@ -105,6 +106,8 @@ class FormulaInstaller
 
     compute_and_install_dependencies unless ignore_deps
 
+    return if only_deps
+
     if ARGV.build_bottle? && (arch = ARGV.bottle_arch) && !Hardware::CPU.optimization_flags.include?(arch)
       raise "Unrecognized architecture for --bottle-arch: #{arch}"
     end
@@ -270,6 +273,7 @@ class FormulaInstaller
     fi.tab = dep_tab
     fi.options = dep_options
     fi.ignore_deps = true
+    fi.only_deps = false
     fi.show_header = false
     oh1 "Installing #{f} dependency: #{Tty.green}#{dep}#{Tty.reset}"
     outdated_keg.unlink if outdated_keg
@@ -282,6 +286,8 @@ class FormulaInstaller
   end
 
   def caveats
+    return if only_deps
+
     if ARGV.homebrew_developer? and not f.keg_only?
       audit_bin
       audit_sbin
@@ -299,6 +305,8 @@ class FormulaInstaller
   end
 
   def finish
+    return if only_deps
+
     ohai 'Finishing up' if ARGV.verbose?
 
     install_plist
-- 
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