Merge branch 'api-version' into 'master'

API: Version information

## What does this MR do?

Adds a new endpoint to retrieve the version information.

## Why was this MR needed?

Clients can now use this information to enable/disable certain API features depending on the version.  

## What are the relevant issue numbers?

Closes #22608, https://gitlab.com/gitlab-org/gitlab-ce/issues/23148

See merge request !6822

2 files changed, 13 insertions, 0 deletions

diff --git a/lib/api/api.rb b/lib/api/api.rb
index c64d444842d..920d098bb24 100644
--- a/lib/api/api.rb
+++ b/lib/api/api.rb
@@ -72,6 +72,7 @@ module API
     mount ::API::Triggers
     mount ::API::Users
     mount ::API::Variables
+    mount ::API::Version
 
     route :any, '*path' do
       error!('404 Not Found', 404)
diff --git a/lib/api/version.rb b/lib/api/version.rb
new file mode 100644
index 00000000000..9ba576bd828
--- /dev/null
+++ b/lib/api/version.rb
@@ -0,0 +1,12 @@
+module API
+  class Version < Grape::API
+    before { authenticate! }
+
+    desc 'Get the version information of the GitLab instance.' do
+      detail 'This feature was introduced in GitLab 8.13.'
+    end
+    get '/version' do
+      { version: Gitlab::VERSION, revision: Gitlab::REVISION }
+    end
+  end
+end