Move error-handling to lib/gitlab/git

app/models/repository.rb

@@ -259,17 +259,7 @@ class Repository
     return if kept_around?(sha)
 
     # This will still fail if the file is corrupted (e.g. 0 bytes)
-    begin
-      raw_repository.write_ref(keep_around_ref_name(sha), sha, shell: false)
-    rescue Gitlab::Git::CommandError => ex
-      if ex.message.start_with?("ReferenceError: ")
-        Rails.logger.error "Unable to create #{REF_KEEP_AROUND} reference for repository #{path}: #{ex}"
-      elsif ex.message.start_with?("OSError: ")
-        raise unless ex.message =~ /Failed to create locked file/ && ex.message =~ /File exists/
-
-        Rails.logger.error "Unable to create #{REF_KEEP_AROUND} reference for repository #{path}: #{ex}"
-      end
-    end
+    raw_repository.write_ref(keep_around_ref_name(sha), sha, shell: false)
   end
 
   def kept_around?(sha)

lib/gitlab/git/repository.rb

@@ -1395,9 +1395,11 @@ module Gitlab
       def rugged_write_ref(ref_path, ref)
         rugged.references.create(ref_path, ref, force: true)
       rescue Rugged::ReferenceError => ex
-        raise CommandError, "ReferenceError: #{ex}"
+        Rails.logger.error "Unable to create #{ref_path} reference for repository #{path}: #{ex}"
       rescue Rugged::OSError => ex
-        raise CommandError, "OSError: #{ex}"
+        raise unless ex.message =~ /Failed to create locked file/ && ex.message =~ /File exists/
+
+        Rails.logger.error "Unable to create #{ref_path} reference for repository #{path}: #{ex}"
       end
 
       def fresh_worktree?(path)