Ignore GIT_TEMPLATE_DIR environment variable in specs

Explicitly specify the template directory as an empty string in specs so
that Overcommit spec runs aren't effected by the `GIT_TEMPLATE_DIR`
environment variable.

Change-Id: Idd79324355c777254584a28ee7c8f22db295d2e3
Reviewed-on: http://gerrit.causes.com/35604
Reviewed-by: Shane da Silva <shane@causes.com>
Tested-by: Shane da Silva <shane@causes.com>

Author: sds

lib/overcommit/installer.rb

@@ -21,6 +21,7 @@ def run(target, options)
     def install
       log.log "Installing hooks into #{@target}"
 
+      ensure_hooks_directory
       install_master_hook
       install_hook_symlinks
 
@@ -41,6 +42,10 @@ def hooks_path
       File.join(absolute_target, '.git', 'hooks')
     end
 
+    def ensure_hooks_directory
+      FileUtils.mkdir_p(hooks_path)
+    end
+
     def validate_target
       absolute_target = File.expand_path(@target)
 

spec/support/git_spec_helpers.rb

@@ -6,7 +6,8 @@ module GitSpecHelpers
 
   def repo(name = 'some-repo', &block)
     directory(name) do
-      `git init`
+      `git init --template=""` # Ensure no template directory is applied
+      `mkdir -p .git/hooks` # Since we don't specify template, need to create ourselves
       block.call if block_given?
     end
   end