08.07.2016 22:01, Lennart Poettering пишет: > On Fri, 01.07.16 06:37, Andrei Borzenkov (arvidj...@gmail.com) wrote: > >> In principle, I do not see why we cannot have WantedBy and RequiredBy as >> first class directives under [Unit] to spare all these hoops. > > systemd loads unit files as they are requested, by following > dependencies. i.e. when we see Wants=foobar.service in a file > quux.service, and quux.service is loaded because it shall be started > then we'll load foobar.service too. systemd does not load unit files > that are not referenced by any other unit. It hence minimizes what it > loads, and it does *not* iterate through the unit dirs loading > everything it finds there. > > Now, if we would permit WantedBy= in [Unit], this would mean that if a > unit file waldo.service carries WantedBy=miau.service in [Unit], then > when miau.service is requested to be started we would somehow have to > determine that waldo.service is to be loaded and started too. But how > could we do that without loading all possible unit files as boot? i > mean, how would we efficiently detect that waldo.service needs to be > loaded when just looking at miau.service if the latter does not carry > in anyway information about the former? >
I see, yes, I did not consider it. Thank you for explanation. _______________________________________________ systemd-devel mailing list systemd-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/systemd-devel
