From e6b7fe74c1ec4ff42967e7bd79d7fe669451d047 Mon Sep 17 00:00:00 2001
From: tv <tv@krebsco.de>
Date: Wed, 24 May 2017 02:03:46 +0200
Subject: krebs/5pkgs: detect simple obsolete overrides

---
 krebs/5pkgs/simple/default.nix | 28 +++++++++++++++++++++-------
 1 file changed, 21 insertions(+), 7 deletions(-)

(limited to 'krebs/5pkgs/simple/default.nix')

diff --git a/krebs/5pkgs/simple/default.nix b/krebs/5pkgs/simple/default.nix
index 2f679975..1b9d8c23 100644
--- a/krebs/5pkgs/simple/default.nix
+++ b/krebs/5pkgs/simple/default.nix
@@ -1,10 +1,24 @@
 with import <stockholm/lib>;
 
 self: super:
-listToAttrs
-  (map
-    (name: nameValuePair (removeSuffix ".nix" name)
-                         (super.callPackage (./. + "/${name}") {}))
-    (filter
-      (name: name != "default.nix" && !hasPrefix "." name)
-      (attrNames (readDir ./.))))
+
+let
+  # This callPackage will try to detect obsolete overrides.
+  callPackage = path: args: let
+    override = self.callPackage path args;
+    upstream = optionalAttrs (override ? "name")
+      (super.${(parseDrvName override.name).name} or {});
+  in if upstream ? "name" &&
+        override ? "name" &&
+        compareVersions upstream.name override.name != -1
+    then trace "Upstream `${upstream.name}' gets overridden by `${override.name}'." override
+    else override;
+in
+
+  listToAttrs
+    (map
+      (name: nameValuePair (removeSuffix ".nix" name)
+                           (callPackage (./. + "/${name}") {}))
+      (filter
+        (name: name != "default.nix" && !hasPrefix "." name)
+        (attrNames (readDir ./.))))
-- 
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