Memoize GitlabShellAdapter for performance and ease of testing

Port of https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/3463#note_47990536

Memoize GitlabShellAdapter for performance and ease of testing
f80654c4 · Stan Hu · 9a8f094e · f80654c4
Commit f80654c4 authored Nov 20, 2017 by Stan Hu
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shell_adapter.rb lib/gitlab/shell_adapter.rb +1 -1

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--- a/lib/gitlab/shell_adapter.rb
+++ b/lib/gitlab/shell_adapter.rb
@@ -5,7 +5,7 @@
 module Gitlab
  module ShellAdapter
    def gitlab_shell
-      Gitlab::Shell.new
+      @gitlab_shell ||= Gitlab::Shell.new
    end
  end
 end