Hi all,

This patch adds a "features.aufs2_1" to the aufs-2.1 patch for Linux 2.6.37 to prevent aufs2_1 and aufs2_1_util from being options for kernels without an aufs 2.1 patch. There were several Hydra build failures as a result of attempting to build aufs2.1 against older kernels.

Cheers,
Shea Levy
Index: nixpkgs/pkgs/os-specific/linux/kernel/patches.nix
===================================================================
--- nixpkgs/pkgs/os-specific/linux/kernel/patches.nix	(revision 26596)
+++ nixpkgs/pkgs/os-specific/linux/kernel/patches.nix	(working copy)
@@ -209,6 +209,7 @@
       name = "aufs2.1";
       patch = ./aufs2.1-37.patch;
       features.aufsBase = true;
+      features.aufs2_1 = true;
     };
 
   # Increase the timeout on CIFS requests from 15 to 120 seconds to
Index: nixpkgs/pkgs/top-level/all-packages.nix
===================================================================
--- nixpkgs/pkgs/top-level/all-packages.nix	(revision 26596)
+++ nixpkgs/pkgs/top-level/all-packages.nix	(working copy)
@@ -5117,12 +5117,16 @@
 
     aufs2 = callPackage ../os-specific/linux/aufs2 { };
 
-    aufs2_1 = callPackage ../os-specific/linux/aufs2.1 { };
+    aufs2_1 = if kernel.features ? aufs2_1 then
+      callPackage ../os-specific/linux/aufs2.1 { }
+      else null;
 
+    aufs2_1_util = if kernel.features ? aufs2_1 then
+      callPackage ../os-specific/linux/aufs2.1-util { }
+      else null;
+
     aufs2_util = callPackage ../os-specific/linux/aufs2-util { };
 
-    aufs2_1_util = callPackage ../os-specific/linux/aufs2.1-util { };
-
     blcr = callPackage ../os-specific/linux/blcr {
       #libtool = libtool_1_5; # libtool 2 causes a fork bomb
     };
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