96a0cfbf47
This adds a new EMERGENCY_ACTION_SLEEP_5S flag, which when set will delay the emergency action for 5s. This is supposed to be used together with EMERGENCY_ACTION_WARN so that users can actually read the message we output. We enable this with all emergency action requests that already set EMERGENCY_ACTION_WARN, except for the 7x ctrl-alt-del burst reboot, where the user knows what they do and there's no real reason to wait, they don't need to be informed. This also enables both EMERGENCY_ACTION_WARN + EMERGENCY_ACTION_SLEEP_5S for FailureAction= processing of regular units, where these were so far off. (it leaves this off for SuccessAction= however!). This is a good thing to make things more debuggable: if something fails and we reboot this really deserves notification of the user. (For SuccessAction= this logic does not apply, since the shutdown action induced here is apparently intended part of the codeflow, for example in systemd-reboot.service or a similar unit, where the shutdown is goal and not exception and derserves no additional noisy reporting). Inspired by: https://github.com/systemd/systemd/pull/36705#issuecomment-2717014120
System and Service Manager
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