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nixos/systemd: Add reloadTriggers to services

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Janne Heß 2022-01-29 23:01:24 +01:00
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17
nixos/doc/manual/from_md/release-notes/rl-2205.section.xml
View File

@ -42,6 +42,14 @@
upgrade notes</link>.
</para>
</listitem>
<listitem>
<para>
systemd services can now set
<link linkend="opt-systemd.services">systemd.services.&lt;name&gt;.reloadTriggers</link>
instead of <literal>reloadIfChanged</literal> for a more
granular distinction between reloads and restarts.
</para>
</listitem>
</itemizedlist>
</section>
<section xml:id="sec-release-22.05-new-services">
@ -550,6 +558,15 @@
honors <literal>restartIfChanged</literal> and
<literal>reloadIfChanged</literal> of the units.
</para>
<itemizedlist spacing="compact">
<listitem>
<para>
Preferring to reload instead of restarting can still
be achieved using
<literal>/run/nixos/activation-reload-list</literal>.
</para>
</listitem>
</itemizedlist>
</listitem>
<listitem>
<para>

3
nixos/doc/manual/release-notes/rl-2205.section.md
View File

@ -17,6 +17,8 @@ In addition to numerous new and upgraded packages, this release has the followin
Migrations may take a while, see the [changelog](https://docs.mattermost.com/install/self-managed-changelog.html#release-v6-3-extended-support-release)
and [important upgrade notes](https://docs.mattermost.com/upgrade/important-upgrade-notes.html).
- systemd services can now set [systemd.services.\<name\>.reloadTriggers](#opt-systemd.services) instead of `reloadIfChanged` for a more granular distinction between reloads and restarts.
## New Services {#sec-release-22.05-new-services}
- [aesmd](https://github.com/intel/linux-sgx#install-the-intelr-sgx-psw), the Intel SGX Architectural Enclave Service Manager. Available as [services.aesmd](#opt-services.aesmd.enable).
@ -179,6 +181,7 @@ In addition to numerous new and upgraded packages, this release has the followin
- `switch-to-configuration` (the script that is run when running `nixos-rebuild switch` for example) has been reworked
* The interface that allows activation scripts to restart units has been streamlined. Restarting and reloading is now done by a single file `/run/nixos/activation-restart-list` that honors `restartIfChanged` and `reloadIfChanged` of the units.
* Preferring to reload instead of restarting can still be achieved using `/run/nixos/activation-reload-list`.
* The script now uses a proper ini-file parser to parse systemd units. Some values are now only searched in one section instead of in the entire unit. This is only relevant for units that don't use the NixOS systemd moule.
* `RefuseManualStop`, `X-OnlyManualStart`, `X-StopOnRemoval`, `X-StopOnReconfiguration` are only searched in the `[Unit]` section
* `X-ReloadIfChanged`, `X-RestartIfChanged`, `X-StopIfChanged` are only searched in the `[Service]` section

16
nixos/lib/systemd-unit-options.nix
View File

@ -201,6 +201,17 @@ in rec {
'';
};
reloadTriggers = mkOption {
default = [];
type = types.listOf unitOption;
description = ''
An arbitrary list of items such as derivations. If any item
in the list changes between reconfigurations, the service will
be reloaded. If anything but a reload trigger changes in the
unit file, the unit will be restarted instead.
'';
};
onFailure = mkOption {
default = [];
type = types.listOf unitNameType;
@ -338,6 +349,11 @@ in rec {
configuration switch if its definition has changed. If
enabled, the value of <option>restartIfChanged</option> is
ignored.
This option should not be used anymore in favor of
<option>reloadTriggers</option> which allows more granular
control of when a service is reloaded and when a service
is restarted.
'';
};

5
nixos/modules/system/boot/systemd.nix
View File

@ -243,6 +243,8 @@ let
{ Requisite = toString config.requisite; }
// optionalAttrs (config.restartTriggers != [])
{ X-Restart-Triggers = toString config.restartTriggers; }
// optionalAttrs (config.reloadTriggers != [])
{ X-Reload-Triggers = toString config.reloadTriggers; }
// optionalAttrs (config.description != "") {
Description = config.description; }
// optionalAttrs (config.documentation != []) {
@ -917,6 +919,9 @@ in
(optional hasDeprecated
"Service '${name}.service' uses the attribute 'StartLimitInterval' in the Service section, which is deprecated. See https://github.com/NixOS/nixpkgs/issues/45786."
)
(optional (service.reloadIfChanged && service.reloadTriggers != [])
"Service '${name}.service' has both 'reloadIfChanged' and 'reloadTriggers' set. This is probably not what you want, because 'reloadTriggers' behave the same whay as 'restartTriggers' if 'reloadIfChanged' is set."
)
]
)
cfg.services