From c1994fecf9f9ea129f6164db92ad242e392d987c Mon Sep 17 00:00:00 2001
From: Eelco Dolstra <eelco.dolstra@logicblox.com>
Date: Mon, 14 Oct 2013 15:20:45 +0200
Subject: [PATCH] nix-shell: Fix bash completion
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Nixpkgs's stdenv setup script sets the "nullglob" option, but doing so
breaks Bash completion on NixOS (when ‘programs.bash.enableCompletion’
is set) and on Ubuntu.  So clear that flag afterwards.  Of course,
this may break stdenv functions in subtle ways...
---
 scripts/nix-build.in | 1 +
 1 file changed, 1 insertion(+)

diff --git a/scripts/nix-build.in b/scripts/nix-build.in
index d7805f83c3..3b5b8413c8 100755
--- a/scripts/nix-build.in
+++ b/scripts/nix-build.in
@@ -210,6 +210,7 @@ foreach my $expr (@exprs) {
             'set +e; ' .
             'PS1="\n\[\033[1;32m\][nix-shell:\w]$\[\033[0m\] "; ' .
             'unset NIX_ENFORCE_PURITY; ' .
+            'shopt -u nullglob; ' .
             $envCommand);
         exec($ENV{NIX_BUILD_SHELL} // "bash", "--rcfile", $rcfile);
         die;