Merge branch 'git-version' into 'master'

Show git version on admin page

Before
![git-version-beore](/uploads/57444ad42220c9dfe8f187b8e399227f/git-version-beore.png)

After
![git-version-after](/uploads/cc1b52ae1a251c2c46d9626c040726ab/git-version-after.png)

gitlab-org/gitlab-ce#4077




See merge request !2101

CHANGELOG

@@ -59,6 +59,8 @@ v 8.3.0 (unreleased)
   - Do not show build status unless builds are enabled and `.gitlab-ci.yml` is present
   - Persist runners registration token in database
   - Fix online editor should not remove newlines at the end of the file
+  - Expose Git's version in the admin area
+
 
 v 8.2.3
   - Fix application settings cache not expiring after changes (Stan Hu)

app/views/admin/dashboard/index.html.haml

@@ -79,6 +79,10 @@
         GitLab API
         %span.pull-right
           = API::API::version
+      %p
+        Git
+        %span.pull-right
+          = Gitlab::Git.version
       %p
         Ruby
         %span.pull-right

lib/gitlab/git.rb

@@ -20,6 +20,10 @@ module Gitlab
       def blank_ref?(ref)
         ref == BLANK_SHA
       end
+
+      def version
+        Gitlab::VersionInfo.parse(Gitlab::Popen.popen(%W(#{Gitlab.config.git.bin_path} --version)).first)
+      end
     end
   end
 end