Fix Satellite#lock

lib/gitlab/satellite/satellite.rb

@@ -25,16 +25,20 @@ module Gitlab
         File.exists? path
       end
 
-      # Locks the satellite and yields
+      # * Locks the satellite
+      # * Changes the current directory to the satellite's working dir
+      # * Yields
       def lock
         raise "Satellite doesn't exist" unless exists?
 
         File.open(lock_file, "w+") do |f|
           f.flock(File::LOCK_EX)
 
+          Dir.chdir(path) do
             return yield
           end
         end
+      end
 
       def lock_file
         Rails.root.join("tmp", "#{project.path}.lock")