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