From d0786fd3e74a9b222076680941b5187ccfd41853 Mon Sep 17 00:00:00 2001
From: Eelco Dolstra <eelco.dolstra@logicblox.com>
Date: Fri, 25 May 2012 13:32:30 +0000
Subject: [PATCH] * Cache nix-pull calls in nixos-install.

svn path=/nixos/trunk/; revision=34241
---
 modules/installer/tools/nixos-install.sh | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/modules/installer/tools/nixos-install.sh b/modules/installer/tools/nixos-install.sh
index 1b0bfc97f08..258f125db5d 100644
--- a/modules/installer/tools/nixos-install.sh
+++ b/modules/installer/tools/nixos-install.sh
@@ -38,7 +38,9 @@ fi
 
 # Do a nix-pull to speed up building.
 if test -n "@nixosURL@" -a ${NIXOS_PULL:-1} != 0; then
-    @nix@/bin/nix-pull @nixosURL@/MANIFEST || true
+    mkdir -p /nix/var/nix/channel-cache -m 0755
+    NIX_DOWNLOAD_CACHE=/nix/var/nix/channel-cache \
+        @nix@/bin/nix-pull @nixosURL@/MANIFEST || true
 fi