Change post-commit and post-merge scripts to symlinks

These should be symlinks so we don't need to update the master hook in
multiple places.

Add some tests to enforce this going forward.

Change-Id: I9c6bcbcd4129aaa46c9d30f4be265dded4770150
Reviewed-on: http://gerrit.causes.com/46928
Reviewed-by: Shane da Silva <shane.dasilva@brigade.com>
Tested-by: Shane da Silva <shane.dasilva@brigade.com>

Author: sds

spec/integration/template_dir_spec.rb

@@ -0,0 +1,25 @@
+require 'spec_helper'
+
+describe 'template directory' do
+  let(:template_dir) { File.join(Overcommit::OVERCOMMIT_HOME, 'template-dir') }
+  let(:hooks_dir) { File.join(template_dir, 'hooks') }
+
+  it 'contains a hooks directory' do
+    File.directory?(hooks_dir).should == true
+  end
+
+  describe 'the hooks directory' do
+    it 'contains the master hook as an actual file with content' do
+      master_hook = File.join(hooks_dir, 'overcommit-hook')
+      File.exist?(master_hook).should == true
+      File.size?(master_hook).should > 0
+      File.symlink?(master_hook).should == false
+    end
+
+    it 'contains all other hooks as symlinks to the master hook' do
+      Overcommit::Utils.supported_hook_types.each do |hook_type|
+        File.symlink?(File.join(hooks_dir, hook_type)).should == true
+      end
+    end
+  end
+end

template-dir/hooks/post-commit

@@ -0,0 +1 @@
+overcommit-hook

template-dir/hooks/post-commit

@@ -0,0 +1 @@
+overcommit-hook