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nixos/gnome3: launch gnome-shell wayland with RT scheduling

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We create a wrapper which launches gnome-shell with the correct environment and
cap_sys_nice.

We can then override gnome-shell-wayland.service to use this wrapper.

NOTE: We need to force clear the environment, because the defaults aren't good
for user services. That should probably be fixed.
This commit is contained in:
Tor Hedin Brønner 2019-10-19 15:38:04 +02:00
parent 9742df1595
commit 927a6fdaad
1 changed files with 20 additions and 0 deletions
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20
nixos/modules/services/x11/desktop-managers/gnome3.nix
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@ -269,6 +269,26 @@ in
source-sans-pro source-sans-pro
]; ];
## Enable soft realtime scheduling, only supported on wayland ##
security.wrappers.".gnome-shell-wrapped" = {
source = "${pkgs.gnome3.gnome-shell}/bin/.gnome-shell-wrapped";
capabilities = "cap_sys_nice=ep";
};
systemd.user.services.gnome-shell-wayland = let
gnomeShellRT = with pkgs.gnome3; pkgs.runCommand "gnome-shell-rt" {} ''
mkdir -p $out/bin/
cp ${gnome-shell}/bin/gnome-shell $out/bin
sed -i "s@${gnome-shell}/bin/@${config.security.wrapperDir}/@" $out/bin/gnome-shell
'';
in {
# Note we need to clear ExecStart before overriding it
serviceConfig.ExecStart = ["" "${gnomeShellRT}/bin/gnome-shell"];
# Do not use the default environment, it provides a broken PATH
environment = mkForce {};
};
# Adapt from https://gitlab.gnome.org/GNOME/gnome-build-meta/blob/gnome-3-32/elements/core/meta-gnome-core-shell.bst # Adapt from https://gitlab.gnome.org/GNOME/gnome-build-meta/blob/gnome-3-32/elements/core/meta-gnome-core-shell.bst
environment.systemPackages = with pkgs.gnome3; [ environment.systemPackages = with pkgs.gnome3; [
adwaita-icon-theme adwaita-icon-theme