From 2400191caf15fec9b6376ca99c555f09df31d294 Mon Sep 17 00:00:00 2001
From: Bryan Gardiner <bog@khumba.net>
Date: Sat, 25 May 2019 20:25:12 -0700
Subject: [PATCH] nixos/xdg/mime: disable fdatasync when building the XDG MIME
database
Back in 2013, update-mime-database started using fdatasync() to write out
its changes after processing each file in /share/mime, with the reasoning
that a corrupted database from an interruption midway would be
problematic for applications[1]. Unfortunately, this caused a
significant regression in the time required to run update-mime-database:
commonly from under a second to half a minute or more.
This delay affects the time required to build system-path on NixOS, when
xdg.mime.enable is true (the default). For example, on one of my systems
system-path builds in ~48 seconds, 45 of which are update-mime-database.
This makes rapidly building new system configurations not fun.
This commit disables the calls to fdatasync(). update-mime-database
checks an environment variable, PKGSYSTEM_ENABLE_FSYNC, to determine
whether it should sync, and we can set this to false. system-path
already only has whatever filesystem commit guarantees that the Nix
builder provides. Furthermore, there is no risk of a failed MIME
database update messing up existing packages, because this is Nix.
(This issue was also reported at and discussed by Debian, Red Hat, and
Gentoo at least.)
[1] https://bugs.freedesktop.org/show_bug.cgi?id=70366
---
nixos/modules/config/xdg/mime.nix | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/nixos/modules/config/xdg/mime.nix b/nixos/modules/config/xdg/mime.nix
index cd1064630fb..a5374c2b468 100644
--- a/nixos/modules/config/xdg/mime.nix
+++ b/nixos/modules/config/xdg/mime.nix
@@ -24,7 +24,7 @@ with lib;
environment.extraSetup = ''
if [ -w $out/share/mime ] && [ -d $out/share/mime/packages ]; then
- XDG_DATA_DIRS=$out/share ${pkgs.buildPackages.shared-mime-info}/bin/update-mime-database -V $out/share/mime > /dev/null
+ XDG_DATA_DIRS=$out/share PKGSYSTEM_ENABLE_FSYNC=0 ${pkgs.buildPackages.shared-mime-info}/bin/update-mime-database -V $out/share/mime > /dev/null
fi
if [ -w $out/share/applications ]; then