7286be7e81
In issue #157787 @martined wrote: Trying to use confinement on packages providing their systemd units with systemd.packages, for example mpd, fails with the following error: system-units> ln: failed to create symbolic link '/nix/store/...-system-units/mpd.service': File exists This is because systemd-confinement and mpd both provide a mpd.service file through systemd.packages. (mpd got updated that way recently to use upstream's service file) To address this, we now place the unit file containing the bind-mounted paths of the Nix closure into a drop-in directory instead of using the name of a unit file directly. This does come with the implication that the options set in the drop-in directory won't apply if the main unit file is missing. In practice however this should not happen for two reasons: * The systemd-confinement module already sets additional options via systemd.services and thus we should get a main unit file * In the unlikely event that we don't get a main unit file regardless of the previous point, the unit would be a no-op even if the options of the drop-in directory would apply Another thing to consider is the order in which those options are merged, since systemd loads the files from the drop-in directory in alphabetical order. So given that we have confinement.conf and overrides.conf, the confinement options are loaded before the NixOS overrides. Since we're only setting the BindReadOnlyPaths option, the order isn't that important since all those paths are merged anyway and we still don't lose the ability to reset the option since overrides.conf comes afterwards. Fixes: https://github.com/NixOS/nixpkgs/issues/157787 Signed-off-by: aszlig <aszlig@nix.build> |
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*** NixOS *** NixOS is a Linux distribution based on the purely functional package management system Nix. More information can be found at https://nixos.org/nixos and in the manual in doc/manual.