Document Repository#keep_around

app/models/repository.rb

@@ -207,6 +207,10 @@ class Repository
     rugged.references.exist?(ref)
   end
+  # Makes sure a commit is kept around when Git garbage collection runs.
+  # Git GC will delete commits from the repository that are no longer in any
+  # branches or tags, but we want to keep some of these commits around, for
+  # example if they have comments or CI builds.
   def keep_around(sha)
     return unless sha && commit(sha)
@@ -219,10 +223,6 @@ class Repository
     ref_exists?(keep_around_ref_name(sha))
   end
-  def keep_around_ref_name(sha)
-    "refs/keep-around/#{sha}"
-  end
-
   def tag_names
     cache.fetch(:tag_names) { raw_repository.tag_names }
   end
@@ -1038,4 +1038,8 @@ class Repository
   def tags_sorted_by_committed_date
     tags.sort_by { |tag| commit(tag.target).committed_date }
   end
+
+  def keep_around_ref_name(sha)
+    "refs/keep-around/#{sha}"
+  end
 end