From 1b5e860f65607b4cc7de4b6b5db95460cf144526 Mon Sep 17 00:00:00 2001
From: Eelco Dolstra <eelco.dolstra@logicblox.com>
Date: Mon, 6 Jan 2014 18:23:41 +0100
Subject: [PATCH] Make /etc/localtime a direct symlink to the zoneinfo file

Some programs (notably the Java Runtime Environment) expect to be able
to extract the name of the time zone from the target of the
/etc/localtime symlink.  That doesn't work if /etc/localtime is a
symlink to /etc/static/localtime.  So make it a direct symlink.
---
 nixos/modules/config/timezone.nix     |  5 ++++-
 nixos/modules/system/etc/setup-etc.pl | 10 +++++++---
 2 files changed, 11 insertions(+), 4 deletions(-)

diff --git a/nixos/modules/config/timezone.nix b/nixos/modules/config/timezone.nix
index 07a76d9ad1fa..979778046fda 100644
--- a/nixos/modules/config/timezone.nix
+++ b/nixos/modules/config/timezone.nix
@@ -27,7 +27,10 @@ with pkgs.lib;
     environment.variables.TZDIR = "/etc/zoneinfo";
     environment.variables.TZ = config.time.timeZone;
 
-    environment.etc.localtime.source = "${pkgs.tzdata}/share/zoneinfo/${config.time.timeZone}";
+    environment.etc.localtime =
+      { source = "${pkgs.tzdata}/share/zoneinfo/${config.time.timeZone}";
+        mode = "direct-symlink";
+      };
 
     environment.etc.zoneinfo.source = "${pkgs.tzdata}/share/zoneinfo";
 
diff --git a/nixos/modules/system/etc/setup-etc.pl b/nixos/modules/system/etc/setup-etc.pl
index 7cb6d2a6a45e..4b79dbaab89e 100644
--- a/nixos/modules/system/etc/setup-etc.pl
+++ b/nixos/modules/system/etc/setup-etc.pl
@@ -57,9 +57,13 @@ sub link {
         open MODE, "<$_.mode";
         my $mode = <MODE>; chomp $mode;
         close MODE;
-        copy "$static/$fn", "$target.tmp" or warn;
-        chmod oct($mode), "$target.tmp" or warn;
-        rename "$target.tmp", $target or warn;
+        if ($mode eq "direct-symlink") {
+            atomicSymlink readlink("$static/$fn"), $target or warn;
+        } else {
+            copy "$static/$fn", "$target.tmp" or warn;
+            chmod oct($mode), "$target.tmp" or warn;
+            rename "$target.tmp", $target or warn;
+        }
     } elsif (-l "$_") {
         atomicSymlink "$static/$fn", $target or warn;
     }