132/376: nix-shell: Use $XDG_RUNTIME_DIR

[Ludovic Court�s]

civodul pushed a commit to tag 1.8
in repository guix.

commit 3e5dbb24337d8416cfe46484eb2692811546a9c1
Author: Eelco Dolstra <eelco.dols...@logicblox.com>
Date:   Wed Aug 13 23:16:08 2014 +0200

    nix-shell: Use $XDG_RUNTIME_DIR
    
    This prevents collisions with other users.
    
    Fixes #262.
---
 scripts/nix-build.in |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/scripts/nix-build.in b/scripts/nix-build.in
index cf7efa8..ef86cb9 100755
--- a/scripts/nix-build.in
+++ b/scripts/nix-build.in
@@ -204,6 +204,7 @@ foreach my $expr (@exprs) {
             or die "$0: failed to build all dependencies\n";
 
         # Set the environment.
+        my $tmp = $ENV{"TMPDIR"} // $ENV{"XDG_RUNTIME_DIR"} // "/tmp";
         if ($pure) {
             foreach my $name (keys %ENV) {
                 next if grep { $_ eq $name } ("HOME", "USER", "LOGNAME", 
"DISPLAY", "PATH", "TERM", "IN_NIX_SHELL", "TZ", "PAGER");
@@ -212,7 +213,7 @@ foreach my $expr (@exprs) {
             # NixOS hack: prevent /etc/bashrc from sourcing /etc/profile.
             $ENV{'__ETC_PROFILE_SOURCED'} = 1;
         }
-        $ENV{'NIX_BUILD_TOP'} = $ENV{'TMPDIR'} = $ENV{'TEMPDIR'} = $ENV{'TMP'} 
= $ENV{'TEMP'} = $ENV{'TMPDIR'} // "/tmp";
+        $ENV{'NIX_BUILD_TOP'} = $ENV{'TMPDIR'} = $ENV{'TEMPDIR'} = $ENV{'TMP'} 
= $ENV{'TEMP'} = $tmp;
         $ENV{'NIX_STORE'} = $Nix::Config::storeDir;
         $ENV{$_} = $drv->{env}->{$_} foreach keys %{$drv->{env}};