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nixos/systemd: add presets to ignore all other presets

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One of the main premises of NixOS is being able to declaratively specify
the services enabled/running on a machine. Since systemd presets allow
to bypass this this declarative nature, add a single preset with the
highest priority (prefixed with "00") that makes systemd ignore all
other presets.
This commit is contained in:
Jared Baur 2024-07-16 16:52:17 -07:00
parent 2b982b99ac
commit 115c1d6901
No known key found for this signature in database
2 changed files with 18 additions and 1 deletions
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9
nixos/modules/system/boot/systemd.nix
View File

@ -566,6 +566,15 @@ in
"systemd/user-generators" = { source = hooks "user-generators" cfg.user.generators; };
"systemd/system-generators" = { source = hooks "system-generators" cfg.generators; };
"systemd/system-shutdown" = { source = hooks "system-shutdown" cfg.shutdown; };
# Ignore all other preset files so systemd doesn't try to enable/disable
# units during runtime.
"systemd/system-preset/00-nixos.preset".text = ''
ignore *
'';
"systemd/user-preset/00-nixos.preset".text = ''
ignore *
'';
});
services.dbus.enable = true;

10
nixos/tests/systemd.nix
View File

@ -75,9 +75,13 @@ import ./make-test-python.nix ({ pkgs, ... }: {
rebootTime = "10min";
kexecTime = "5min";
};
environment.etc."systemd/system-preset/10-testservice.preset".text = ''
disable ${config.systemd.services.testservice1.name}
'';
};
testScript = ''
testScript = { nodes, ... }: ''
import re
import subprocess
@ -213,5 +217,9 @@ import ./make-test-python.nix ({ pkgs, ... }: {
with subtest("systemd environment is properly set"):
machine.systemctl("daemon-reexec") # Rewrites /proc/1/environ
machine.succeed("grep -q TZDIR=/etc/zoneinfo /proc/1/environ")
with subtest("systemd presets are ignored"):
machine.succeed("systemctl preset ${nodes.machine.systemd.services.testservice1.name}")
machine.succeed("test -e /etc/systemd/system/${nodes.machine.systemd.services.testservice1.name}")
'';
})