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nixpkgs/nixos/modules/config/xdg/mime.nix
Bryan Gardiner 2400191caf
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
2019-05-25 21:00:25 -07:00

37 lines
1.2 KiB
Nix

{ config, lib, pkgs, ... }:
with lib;
{
options = {
xdg.mime.enable = mkOption {
type = types.bool;
default = true;
description = ''
Whether to install files to support the
<link xlink:href="https://specifications.freedesktop.org/shared-mime-info-spec/shared-mime-info-spec-latest.html">XDG Shared MIME-info specification</link> and the
<link xlink:href="https://specifications.freedesktop.org/mime-apps-spec/mime-apps-spec-latest.html">XDG MIME Applications specification</link>.
'';
};
};
config = mkIf config.xdg.mime.enable {
environment.pathsToLink = [ "/share/mime" ];
environment.systemPackages = [
# this package also installs some useful data, as well as its utilities
pkgs.shared-mime-info
];
environment.extraSetup = ''
if [ -w $out/share/mime ] && [ -d $out/share/mime/packages ]; then
XDG_DATA_DIRS=$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
${pkgs.buildPackages.desktop-file-utils}/bin/update-desktop-database $out/share/applications
fi
'';
};
}