From f06ec788593ab94a16605b340dafbb8fdd77b4ce Mon Sep 17 00:00:00 2001
From: Eelco Dolstra <eelco.dolstra@logicblox.com>
Date: Fri, 12 Jun 2015 18:02:39 +0200
Subject: [PATCH] Handle building from a dirty Git tree

---
 release.nix | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/release.nix b/release.nix
index 400cb533..a0860ecf 100644
--- a/release.nix
+++ b/release.nix
@@ -50,6 +50,13 @@ in rec {
         addToSearchPath PERL5LIB $(pwd)/src/lib
       '';
 
+      postUnpack = ''
+        # Clean up when building from a working tree.
+        if [ -z "$IN_NIX_SHELL" ]; then
+          (cd $sourceRoot && (git ls-files -o --directory | xargs -r rm -rfv)) || true
+        fi
+      '';
+
       configureFlags =
         [ "--with-docbook-xsl=${docbook_xsl}/xml/xsl/docbook" ];