From b4d76b4e509d552724ed3879818cecb753f48b7a Mon Sep 17 00:00:00 2001
From: Zeke Gabrielse <ezekg@yahoo.com>
Date: Fri, 24 Jan 2025 08:49:09 -0600
Subject: [PATCH] add docker api version header to ping

---
 config/routes.rb | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/config/routes.rb b/config/routes.rb
index 7333c80bf..e53e430a3 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -664,8 +664,9 @@
     scope module: 'api/v1/release_engines', constraints: { subdomain: 'oci.pkg' } do
       # NOTE(ezekg) /v2 namespace is handled here because docker wants it at the root...
       scope :v2 do
+        # see: https://github.com/distribution/distribution/blob/main/docs/content/spec/api.md#api-version-check
         # see: https://github.com/opencontainers/distribution-spec/blob/main/spec.md#endpoints
-        match '/', via: %i[head get], to: -> env { [200, {}, []] }
+        match '/', via: %i[head get], to: -> env { [200, {'Docker-Distribution-Api-Version': 'registry/2.0'}, []] }
 
         case
         when Keygen.multiplayer?