On Wed, Dec 19, 2018 at 09:52:57AM -0500, Frediano Ziglio wrote: > The "Requisite" still prevents the socket to be activated with a > "systemctl enable spice-vdagentd.socket" launched manually. > You can obviously complaint that users should not do that but > I don't think that if the system says "you don't have the device > needed" when effectively don't have the needed device is a bad > approach. So personally I would like to keep the "Requisite". > About the "After" I have no idea of the difference that it can > make. If you want some strong relationship like this, maybe we should change it to BindsTo: BindsTo= Configures requirement dependencies, very similar in style to Requires=. However, this dependency type is stronger: in addition to the effect of Requires= it declares that if the unit bound to is stopped, this unit will be stopped too. This means a unit bound to another unit that suddenly enters inactive state will be stopped too. Units can suddenly, unexpectedly enter inactive state for different reasons: the main process of a service unit might terminate on its own choice, the backing device of a device unit might be unplugged or the mount point of a mount unit might be unmounted without involvement of the system and service manager. When used in conjunction with After= on the same unit the behaviour of BindsTo= is even stronger. In this case, the unit bound to strictly has to be in active state for this unit to also be in active state. This not only means a unit bound to another unit that suddenly enters inactive state, but also one that is bound to another unit that gets skipped due to a failed condition check (such as ConditionPathExists=, ConditionPathIsSymbolicLink=, ... — see below) will be stopped, should it be running. Hence, in many cases it is best to combine BindsTo= with After=. Christophe
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