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aszlig 7286be7e81 nixos/systemd-confinement: Allow shipped unit file
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>
2022-03-02 11:42:44 -08:00
.github Merge pull request #162450 from Mic92/actions-labeler 2022-03-02 04:57:15 +00:00
doc Merge pull request #161111 from ulrikstrid/ulrikstrid/coq-move-dune-to-native 2022-02-26 08:54:53 +01:00
lib Merge pull request #162283 from Infinisil/functionTo.description 2022-03-02 19:42:48 +01:00
maintainers Merge pull request #149751 from CorbanR/add_user_to_maintainers 2022-03-02 17:45:58 +01:00
nixos nixos/systemd-confinement: Allow shipped unit file 2022-03-02 11:42:44 -08:00
pkgs python3Packages.wandb: 0.12.10 -> 0.12.11 2022-03-02 11:41:33 -08:00
.editorconfig .editorconfig: remove emscripten 2022-02-14 07:02:32 +10:00
.git-blame-ignore-revs git-blame-ignore-revs: add a file to ignore certain git revisions 2022-03-02 02:25:13 +02:00
.gitattributes
.gitignore gitignore: add .vscode/ 2021-12-31 12:26:20 -08:00
.version increment version to 22.05 2021-11-22 14:33:35 -07:00
CONTRIBUTING.md CONTRIBUTING: Make clearer where branch policy can be found 2022-01-04 21:43:10 +01:00
COPYING COPYING: 2021 -> 2022 2022-01-11 20:58:07 +00:00
default.nix docs: add -L to remaining curl install commands 2020-09-11 12:14:07 -07:00
flake.nix nixos: move default module location logic to eval-config.nix 2022-01-27 22:13:35 +01:00
README.md README: make supporters badge grammatical 2022-02-17 08:57:09 -08:00

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