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Re: RPM macros question



On August 2, 2012 20:59:30 Paul Howarth wrote:
> On Thu, 02 Aug 2012 13:21:54 -0600
> 
> Dmitry Makovey <dmitry athabascau ca> wrote:
> > On August 2, 2012 20:12:10 Paul Howarth wrote:
> > > I don't think there's a standard for this, but an approach I've used
> > > with success is to test for the existence of the /run/lock
> > > directory:
> > > 
> > > # If directory /run/lock exists, do a systemd-based build;
> > > otherwise,a sysvinit-based build
> > > %global use_systemd %([ -d /run/lock ] && echo 1 || echo 0)
> > 
> > That's a good idea, thanks Paul.
> > 
> > Being paranoid I'm thinking of adding a step:
> > 
> > %global use_systemd %([ -d /run/lock ] && rpm --quiet -qf /run/lock
> > && echo 1 || echo 0)
> > 
> > that should make sure /run/lock is not there because it happened that
> > sysadmin just decided create it manually and doesn't happen to run
> > any systemd... Does that make sense?
> 
> Well it's fine in principle but unfortunately accessing the rpm
> database like that from within a package build is a bad idea because
> the build system may be using a chroot populated by a different version
> of rpm than the one the target system uses, which could make the rpm
> database unreadable at package build time, for instance if the builder
> and target systems use different versions of Berkeley DB.
> 
> The mock approach used in Fedora/EPEL is affected by this.

ouch. good to know, thanks!

> 
> Paul.
-- 
Dmitry Makovey
Web Systems Administrator
Athabasca University
(780) 675-6245
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