On Thu, 2021-02-04 at 13:07 +0100, Reindl Harald wrote: > Am 04.02.21 um 12:46 schrieb Benjamin Berg: > > On Wed, 2021-02-03 at 16:43 +0100, Reindl Harald wrote: > > > seriously - explain what you expect to happen in case of > > > > > > Requires=a.service > > > Before=a.service > > > > > > except some warning that it's nonsense > > > > So, one way I used it is as ExecStartPost= equivalent for a .target > > unit. i.e. pull in a Type=oneshot service once a target has become > > active in order to execute a simple command > > "Requires=a.service" combined with "Before=a.service" is > contradictory - > don't you get that?
Your statements will not become more informed by repeating them. It looks to me like you are interpreting Requires= incorrectly. Of course, one can see a contradiction in saying "B requires A in order to run" and then also saying "start A after B is ready". But systemd considers requirements and ordering as two independent problems. As such "Requires=A" only means something like "unit A must be added to the transaction together with B". A statement that does not imply ordering. Yes, this is a a very logical/mathematical meaning which may not be what you intuitively expect. And it does have the unfortunate side effect of sometimes confusing people and they forget to add a needed After= that they thought was implied. But, it is well defined what happens when combining Requires= with Before=. There is no contradiction. Benjamin
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