From f0e29b3a46026d7283162df5e30ce7c46836f470 Mon Sep 17 00:00:00 2001
From: Joshua Timberman <jtimberman@users.noreply.github.com>
Date: Tue, 9 Dec 2014 11:29:48 -0700
Subject: Merge pull request #2582 from
 jtimberman/jtimberman/brew-info-installed

Fixes #2578, check that `installed` isn't empty
Conflicts:
	CHANGELOG.md
---
 CHANGELOG.md                                |  3 +++
 lib/chef/provider/package/homebrew.rb       | 10 +++++++++-
 spec/unit/provider/package/homebrew_spec.rb | 26 ++++++++++++++++++++++++++
 3 files changed, 38 insertions(+), 1 deletion(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9f5c6d5e5e..c55ad8aa57 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,6 @@
+## 12.0.2 (Unreleased)
+* [Issue 2578](https://github.com/opscode/chef/issues/2578) Check that `installed` is not empty for `keg_only` formula in Homebrew provider
+
 ## 12.0.1
 * [Issue 2552](https://github.com/opscode/chef/issues/2552) Create constant for LWRP before calling `provides`
 * [Issue 2545](https://github.com/opscode/chef/issues/2545) `path` attribute of `execute` resource is restored to provide backwards compatibility with Chef 11.
diff --git a/lib/chef/provider/package/homebrew.rb b/lib/chef/provider/package/homebrew.rb
index 822f4c8a42..1b407a1901 100644
--- a/lib/chef/provider/package/homebrew.rb
+++ b/lib/chef/provider/package/homebrew.rb
@@ -94,7 +94,15 @@ class Chef
         # that brew thinks is linked as the current version.
         #
         def current_installed_version
-          brew_info['keg_only'] ? brew_info['installed'].last['version'] : brew_info['linked_keg']
+          if brew_info['keg_only']
+            if brew_info['installed'].empty?
+              nil
+            else
+              brew_info['installed'].last['version']
+            end
+          else
+            brew_info['linked_keg']
+          end
         end
 
         # Packages (formula) available to install should have a
diff --git a/spec/unit/provider/package/homebrew_spec.rb b/spec/unit/provider/package/homebrew_spec.rb
index dccd8edf11..d01d455b09 100644
--- a/spec/unit/provider/package/homebrew_spec.rb
+++ b/spec/unit/provider/package/homebrew_spec.rb
@@ -93,6 +93,27 @@ describe Chef::Provider::Package::Homebrew do
     }
   end
 
+  let(:keg_only_uninstalled_brew_info) do
+    {
+      'name' => 'emacs-kegger',
+      'homepage' => 'http://www.gnu.org/software/emacs/',
+      'versions' => {
+        'stable' => '24.3-keggy',
+        'bottle' => false,
+        'devel' => nil,
+        'head' => 'HEAD'
+      },
+      'revision' => 0,
+      'installed' => [],
+      'linked_keg' => nil,
+      'keg_only' => true,
+      'dependencies' => [],
+      'conflicts_with' => [],
+      'caveats' => '',
+      'options' => []
+    }
+  end
+
   before(:each) do
 
   end
@@ -141,6 +162,11 @@ describe Chef::Provider::Package::Homebrew do
       allow(provider).to receive(:brew_info).and_return(uninstalled_brew_info)
       expect(provider.current_installed_version).to be_nil
     end
+
+    it 'returns nil if the package is keg only and not installed' do
+      allow(provider).to receive(:brew_info).and_return(keg_only_uninstalled_brew_info)
+      expect(provider.current_installed_version).to be_nil
+    end
   end
 
   describe 'brew' do
-- 
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