opengl: Disable pipefail to allow early out

Prior operator || and putting builtins subshells workaround didn't
work with in all build shells.

pkgs/opengl/auto-virtualgl.sh

@@ -1,6 +1,3 @@
-#!/bin/bash
-
-
 # Stream producers
 #
 # These produce a stream of escaped new-line separated items
@@ -9,22 +6,14 @@
 # Stream the given arguments
 #
 VGL_sourceS() {
-  ( printf '%q\n' "$@" ) || (( $? == 141 ))
+  printf '%q\n' "$@"
-}
-
-
-# Stream the results of the given command
-#
-VGL_systemS() {
-  declare -a command=("$@")
-  ( eval $(printf '%q ' "${command[@]}") ) || (( $? == 141 ))
 }
 
 # Stream the results of find (correctly escapes all filenames)
 #
 VGL_findS() {
   declare -a options=("$@") file
-  VGL_systemS find "${options[@]}" -print0 |
+  find "${options[@]}" -print0 |
     while read -d '' -r file; do
       VGL_sourceS "$file"
     done
@@ -34,7 +23,7 @@ VGL_findS() {
 #
 VGL_elfLibsS() {
   declare file=$1 line
-  VGL_systemS ldd "$file" |
+  ldd "$file" |
     while read line; do
       line=${line#$'\t'}
       case "$line" in
@@ -136,6 +125,9 @@ VGL_isLibGL() {
 # Find all executables that depend on libGL and add a libvglfaker.so dependency
 #
 VGL_autoAddVGL() {
+  declare opts=$(shopt -p) output
+  set +o pipefail
+
   echo "Inserting VirtualGL into OpenGL executables in $prefix..." >&2
 
   for output in $outputs; do
@@ -155,6 +147,8 @@ VGL_autoAddVGL() {
       done
     }
   done
+
+  eval "$opts"
 }
 
 postFixupHooks+=(VGL_autoAddVGL)

pkgs/opengl/default.nix

@@ -3,7 +3,7 @@
 # Add a setup hook to the mesa_noglu package that automatically adds
 # a libvglfaker.so dependency to executables that depend on libGL.so.
 
-{ super, lib, buildEnv, makeSetupHook, file }:
+{ super, lib, buildEnv, makeSetupHook, file, bash }:
 
 let
   autoVirtualGLHook =