Update config_version to use a script that does not require git

The config_version now uses a script that will do one of two
things:

1. call config_version.rb which uses rugged to find the information
about the latest commit if PE is on version 2015.2 or newer

2. make a call to git if the PE version is less than 2015.2

environment.conf

@@ -1,5 +1,5 @@
 modulepath          = modules:site:$basemodulepath
-config_version      = '/usr/bin/git --git-dir $confdir/environments/$environment/.git rev-parse HEAD'
+config_version      = 'scripts/config_version.sh $environmentpath $environment'
 
 # Environment timeout should be set to unlimited. When set to zero it is less performant.   
 # When code is deployed the admin API of puppetserver should be used to force a refresh of code from disk.

scripts/config_version.rb

@@ -0,0 +1,17 @@
+require 'rugged'
+
+environmentpath = ARGV[0]
+environment     = ARGV[1]
+
+repo = Rugged::Repository.discover(File.join(environmentpath, environment))
+head  = repo.head
+
+#sha1 hash of the newest commit
+head_sha = head.target_id
+
+#the commit message associated the newest commit
+commit = repo.lookup(head_sha)
+
+#add something to find the remote url
+
+puts head_sha

scripts/config_version.sh

@@ -0,0 +1,7 @@
+#!/bin/bash
+if [ -e /opt/puppetlabs/server/pe_version ]
+then 
+  /opt/puppetlabs/puppet/bin/ruby $1/$2/scripts/config_version.rb $1 $2  
+else
+  /usr/bin/git --git-dir $codedir/environments/$environment/.git rev-parse HEAD
+fi