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-rw-r--r--lib/kernel.nix10
1 files changed, 10 insertions, 0 deletions
diff --git a/lib/kernel.nix b/lib/kernel.nix
index bfadf148be25..2ce19f8cb68c 100644
--- a/lib/kernel.nix
+++ b/lib/kernel.nix
@@ -13,4 +13,14 @@ with lib;
   module   = { tristate    = "m"; };
   freeform = x: { freeform = x; };
 
+  /*
+    Common patterns/legacy used in common-config/hardened-config.nix
+   */
+  whenHelpers = version: {
+    whenAtLeast = ver: mkIf (versionAtLeast version ver);
+    whenOlder   = ver: mkIf (versionOlder version ver);
+    # range is (inclusive, exclusive)
+    whenBetween = verLow: verHigh: mkIf (versionAtLeast version verLow && versionOlder version verHigh);
+  };
+
 }