Am Wed, 25 Feb 2015 23:42:20 +0100 schrieb Marc Joliet <mar...@gmx.de>:
> Am Wed, 25 Feb 2015 00:11:18 +0100 > schrieb Marc Joliet <mar...@gmx.de>: > > [...] > > What was more difficult was getting it to depend on the right network target > > properly. The same "Requires" line that worked for samba and cups fails > > with > > "failed to add dependency" type errors: > > > > Feb 24 21:20:01 marcec systemd[540]: Cannot add dependency job for unit > > mpd.service, ignoring: Unit netctl@dhcp-wan0.service failed to load: No > > such file or directory. > > > > So apparently user units can't "Require" system units? However, adding a > > symlink from the service unit in /etc to .../mpd.service.requires/ solved > > that > > problem, but yielded a new one: > > > > Feb 24 23:26:49 marcec network[2200]: netctl needs root privileges > > > > Oh, well... Maybe it would work with systemd-networkd? > [...] > > FWIW, I found this earlier today: > http://www.freedesktop.org/wiki/Software/systemd/NetworkTarget/, which even > has > its own FAQ entry (guess I should have found it earlier, then). Systemd has a > network-online.target, which looks like what I want(ed). I'm too tired to try > it > now, but I'll do so tomorrow. OK, I looked at this today and it turns out that the way I reconfigured mpd (to use 'bind_to_address "any"') is not only a simpler way to express what I had already configured it to do anyway, but is also in line with the recommendations in the above article (in the last section "What does this mean for me, a Developer?"). That article also pointed me to the correct solution for my cups and dovecot socket units: what one *should* do when one wants/has to listen to a particular address is set "FreeBind=true", which allows the bind to succeed even if the address is not configured yet. This is obviously much better than trying to meddle with dependencies as I was doing above. (Current versions (i.e., ~arch) of MPD ship a socket unit, so one can use FreeBind there, too, if necessary.) -- Marc Joliet -- "People who think they know everything really annoy those of us who know we don't" - Bjarne Stroustrup
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