[systemd-devel] Supporting ExecStartPre= and friends in `systemctl set-property` or `systemd-run -p`
intelfx100 at gmail.com
Wed May 6 04:05:50 PDT 2015
On 2015-05-06 at 09:16 +0300, Andrei Borzenkov wrote:
> On Wed, May 6, 2015 at 5:52 AM, Ivan Shapovalov <intelfx100 at gmail.com
> > wrote:
> > On 2015-04-24 at 11:10 +0200, Lennart Poettering wrote:
> > > On Fri, 24.04.15 04:07, Ivan Shapovalov (intelfx100 at gmail.com)
> > > wrote:
> > >
> > > > - do `systemd-run` twice and somehow set up the dependencies
> > > > between
> > > > two transient units
> > >
> > > I'd be happy to take a patch that allows configuring deps for
> > > transient units when constructing them.
> > Hi Lennart,
> > I've just done this (also added manager-side support for
> > JoinsNamespaceOf= and RequiresMountsFor=, while at it). However,
> > this
> > turned out to be insufficient for my usecase.
> > I have to start two transient services, say, A.service and
> > B.service,
> > and
> > - B.service "needs" A.service
> > (i. e. B.service Requires=A.service and After=A.service)
> > - A.service must be stopped as soon as B.service exits
> > (i. e. A.service BindsTo=B.service)
> > And there is a contradiction: I can't make a dependency on an
> > inexistent unit.
> > If I create A.service before B.service, I can't set BindsTo=, and
> > if I
> > create B.service before A.service, I can't set Requires= and
> > After=.
> > Locally, I've solved this by allowing inverse dependencies to be
> > set
> > over the bus. That is, I make B.service BoundBy=A.service. Is this
> > acceptable for upstream?
> What about adding option --define-only (I do not care about actual
> name) that adds unit definition but does not start unit? Then you can
> define any number of transient units and then "systemctl start" them
I'm unsure how to fit this into the GC logic. Transient units get
unloaded (and hence removed from disk) once they become inactive.
If we create a transient unit without starting it at the same time
(before the GC has a chance to run), it will be immediately removed.
Ivan Shapovalov / intelfx /
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