From 3bbe4c322a5bff9b7d69899c341b4d59a25fa56c Mon Sep 17 00:00:00 2001
From: Cole Helbling <cole.e.helbling@outlook.com>
Date: Sat, 3 Oct 2020 10:03:55 -0700
Subject: [PATCH] nixos-install: use mountpoint as store

Otherwise, it's possible building a flake may cause the live CD to run
out of memory.
---
 nixos/modules/installer/tools/nixos-install.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/nixos/modules/installer/tools/nixos-install.sh b/nixos/modules/installer/tools/nixos-install.sh
index a180d1bc4c1..90555f14580 100644
--- a/nixos/modules/installer/tools/nixos-install.sh
+++ b/nixos/modules/installer/tools/nixos-install.sh
@@ -153,7 +153,7 @@ if [[ -z $system ]]; then
     else
         echo "building the flake in $flake..."
         nix "${flakeFlags[@]}" build "$flake#$flakeAttr.config.system.build.toplevel" \
-            --extra-substituters "$sub" "${verbosity[@]}" \
+            --store "$mountPoint" --extra-substituters "$sub" "${verbosity[@]}" \
             "${extraBuildFlags[@]}" "${lockFlags[@]}" --out-link "$outLink"
     fi
     system=$(readlink -f "$outLink")