From 0489025cabc62a6cfa5601abdde2cc32001f9a81 Mon Sep 17 00:00:00 2001
From: Joachim Fasting <joachifm@fastmail.fm>
Date: Sat, 25 May 2019 15:04:12 +0200
Subject: [PATCH] lvm2: allow building with systemd = null

The closure still picks up systemd via udev, however, overriding with eudev is
necessary to avoid the reference.
---
 pkgs/os-specific/linux/lvm2/default.nix | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/pkgs/os-specific/linux/lvm2/default.nix b/pkgs/os-specific/linux/lvm2/default.nix
index bf5aa88f5bb..d6522e60e9e 100644
--- a/pkgs/os-specific/linux/lvm2/default.nix
+++ b/pkgs/os-specific/linux/lvm2/default.nix
@@ -34,11 +34,11 @@ stdenv.mkDerivation {
 
   preConfigure =
     ''
-      substituteInPlace scripts/lvm2_activation_generator_systemd_red_hat.c \
-        --replace /usr/bin/udevadm ${systemd}/bin/udevadm
-
       sed -i /DEFAULT_SYS_DIR/d Makefile.in
       sed -i /DEFAULT_PROFILE_DIR/d conf/Makefile.in
+    '' + stdenv.lib.optionalString (systemd != null) ''
+      substituteInPlace scripts/lvm2_activation_generator_systemd_red_hat.c \
+        --replace /usr/bin/udevadm ${systemd}/bin/udevadm
     '';
 
   enableParallelBuilding = true;
@@ -73,7 +73,7 @@ stdenv.mkDerivation {
     ''
       substituteInPlace $out/lib/udev/rules.d/13-dm-disk.rules \
         --replace $out/sbin/blkid ${utillinux}/sbin/blkid
-
+    '' + stdenv.lib.optionalString (systemd != null) ''
       # Systemd stuff
       mkdir -p $out/etc/systemd/system $out/lib/systemd/system-generators
       cp scripts/blk_availability_systemd_red_hat.service $out/etc/systemd/system