Add "deny disk access" Gitaly feature (tripswitch)

1 files changed, 42 insertions, 0 deletions

diff --git a/lib/gitlab/temporarily_allow.rb b/lib/gitlab/temporarily_allow.rb
new file mode 100644
index 00000000000..880e55f71df
--- /dev/null
+++ b/lib/gitlab/temporarily_allow.rb
@@ -0,0 +1,42 @@
+module Gitlab
+  module TemporarilyAllow
+    TEMPORARILY_ALLOW_MUTEX = Mutex.new
+
+    def temporarily_allow(key)
+      temporarily_allow_add(key, 1)
+      yield
+    ensure
+      temporarily_allow_add(key, -1)
+    end
+
+    def temporarily_allowed?(key)
+      if RequestStore.active?
+        temporarily_allow_request_store[key] > 0
+      else
+        TEMPORARILY_ALLOW_MUTEX.synchronize do
+          temporarily_allow_ivar[key] > 0
+        end
+      end
+    end
+
+    private
+
+    def temporarily_allow_ivar
+      @temporarily_allow ||= Hash.new(0)
+    end
+
+    def temporarily_allow_request_store
+      RequestStore[:temporarily_allow] ||= Hash.new(0)
+    end
+
+    def temporarily_allow_add(key, value)
+      if RequestStore.active?
+        temporarily_allow_request_store[key] += value
+      else
+        TEMPORARILY_ALLOW_MUTEX.synchronize do
+          temporarily_allow_ivar[key] += value
+        end
+      end
+    end
+  end
+end