How to skip the 90s timeout in systemd

This answer is based on askubuntu.com/a/661747/394818 (as also referred to in the comment by @sun-bear), askubuntu.com/q/616272/394818 and superuser.com/a/1269158/585953.

Using a system service:

Create the file /etc/systemd/system/my_user_script.service:

[Unit]
Description=Run my_user_script
After=suspend.target hibernate.target hybrid-sleep.target suspend-then-hibernate.target


[Service]
ExecStart=/path/to/my_user_script
#User=my_user_name
#Environment=DISPLAY=:0

[Install]
WantedBy=suspend.target hibernate.target hybrid-sleep.target suspend-then-hibernate.target

Remove suspend/hibernate/hybrid in case the service should only be executed after waking up from a specific type of sleep. In case the service needs to be run by a specific user, uncomment the User= and Environment= lines and replace the relevant user name.

Install the service file with:

sudo systemctl enable my_user_script

Using a user service will not work:

In order to avoid setting a hard coded user name with User=, one could create the exact same service file at ~/.config/systemd/user/my_user_script.service and activate with

systemctl --user enable my_user_script

However, that will not work. @grawity explains in more detail at unix.stackexchange.com/a/174837/163108 why that is:

sleep.target is specific to system services. The reason is, sleep.target is not a magic target that automatically gets activated when going to sleep. It's just a regular target that puts the system to sleep – so the 'user' instances of course won't have an equivalent. (And unfortunately the 'user' instances currently have no way to depend on systemwide services.)

If you need to script this, you should look into using the systemctl show command. It is more useful for scripts than trying to parse anything from status. For example, to find when the service last started you can use:

$ systemctl show systemd-journald --property=ActiveEnterTimestamp
ActiveEnterTimestamp=Wed 2017-11-08 05:55:17 UTC

If you would like to see all the properties available just omit the flag and it will dump them all out.

$ systemctl show <service_name>

The documentation for these properties can be found here.