mirror of
https://codeberg.org/privacy1st/nix-git
synced 2024-11-27 22:55:02 +01:00
91 lines
3.2 KiB
Nix
91 lines
3.2 KiB
Nix
|
{ config, pkgs, lib, ... }:
|
||
|
|
|
||
|
|
# Relevant references:
|
||
|
|
# How to prevent systemd suspend from stopping any service with a dont-sleep.service. https://askubuntu.com/q/830442/1002706
|
||
|
|
|
||
|
|
# systemctl show test-block-suspend.service -p TimeoutStopUSec
|
||
|
|
#=> TimeoutStopUSec=infinity
|
||
|
|
|
||
|
|
# systemctl cat test-block-suspend.service
|
||
|
|
|
||
|
|
# systemctl list-dependencies --before test-block-suspend.service
|
||
|
|
#=> test-block-suspend.service
|
||
|
|
#=> ├─shutdown.target
|
||
|
|
#=> ├─sleep.target
|
||
|
|
#=> │ ├─systemd-hibernate.service
|
||
|
|
#=> │ ├─systemd-hybrid-sleep.service
|
||
|
|
#=> │ ├─systemd-suspend-then-hibernate.service
|
||
|
|
#=> │ └─systemd-suspend.service
|
||
|
|
#=> └─suspend.target
|
||
|
|
#=> └─post-resume.service
|
||
|
|
|
||
|
|
{
|
||
|
|
# Alternative approach to adding `conflicts`, `before` and `ExecStop`.
|
||
|
|
#
|
||
|
|
# Immediately before entering system suspend, all executables in /usr/lib/systemd/system-sleep/ are run.
|
||
|
|
# Execution of the sleep action is not continued until all have finished.
|
||
|
|
# TODO: This happens after my screen got blank, wifi disabled, screen locker activated, etc.
|
||
|
|
# environment.etc."systemd/system-sleep/test-block-suspend".source =
|
||
|
|
# pkgs.writeShellScript "test-block-suspend" ''
|
||
|
|
# set -eu -o pipefail
|
||
|
|
# if [ "$1" == "pre" ]; then
|
||
|
|
# while :; do
|
||
|
|
# systemctl is-active --quiet test-block-suspend.service || exit 0
|
||
|
|
# ${pkgs.coreutils}/bin/echo 'Waiting until service has finished ...'
|
||
|
|
# ${pkgs.coreutils}/bin/sleep 1s
|
||
|
|
# done
|
||
|
|
# fi
|
||
|
|
# '';
|
||
|
|
|
||
|
|
systemd.services."test-block-suspend" = {
|
||
|
|
description = "Inhibit suspend";
|
||
|
|
|
||
|
|
# If suspend is initiated, this service is stopped.
|
||
|
|
conflicts = [ "sleep.target" ];
|
||
|
|
# Start-up of `sleep.target`
|
||
|
|
# is delayed until this service has finished starting up.
|
||
|
|
before = [ "sleep.target" ];
|
||
|
|
|
||
|
|
serviceConfig = {
|
||
|
|
# `simple`:
|
||
|
|
# As soon as the main process (defined in the `ExecStart`) is started (forked),
|
||
|
|
# start-up is considered as finished.
|
||
|
|
# `notify`:
|
||
|
|
# The service sends a "READY=1" notification message via `sd_notify` when it has finished starting up.
|
||
|
|
# Requires `NotifyAccess`.
|
||
|
|
# See https://www.freedesktop.org/software/systemd/man/latest/systemd-notify.html
|
||
|
|
Type = "notify";
|
||
|
|
NotifyAccess = "main";
|
||
|
|
|
||
|
|
# To stop this service `ExecStop` is run instead of sending SIGTERM to the main process of the service.
|
||
|
|
# The command specified by `ExecStop` does never end,
|
||
|
|
# thus stopping this service takes forever.
|
||
|
|
# TODO: However, the sleep action continues while `ExecStop` is running. As a reslut, the system suspends.
|
||
|
|
ExecStop = "${pkgs.coreutils}/bin/sleep infinity";
|
||
|
|
TimeoutStopSec = "infinity";
|
||
|
|
|
||
|
|
# This service executes a shell script as main process.
|
||
|
|
ExecStart = pkgs.writeShellScript "test-block-suspend-execstart" ''
|
||
|
|
set -eu -o pipefail
|
||
|
|
|
||
|
|
#handle_sigterm(){
|
||
|
|
# #while :; do
|
||
|
|
# printf '%s\n' 'Ignoring SIGTERM ...' >&2
|
||
|
|
# # ${pkgs.coreutils}/bin/sleep 5s
|
||
|
|
# #done
|
||
|
|
#}
|
||
|
|
#trap 'handle_sigterm' TERM
|
||
|
|
|
||
|
|
#printf '%s\n' 'Start-up 30s ...'
|
||
|
|
#${pkgs.coreutils}/bin/sleep 30s
|
||
|
|
systemd-notify READY=1
|
||
|
|
|
||
|
|
while :; do
|
||
|
|
printf '%s\n' 'Still alive'
|
||
|
|
${pkgs.coreutils}/bin/sleep 5s
|
||
|
|
done
|
||
|
|
'';
|
||
|
|
};
|
||
|
|
};
|
||
|
|
}
|