Re: Running ldconfig after the RPM transaction

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On Wed, Sep 01, 2021 at 11:01:01AM +0200, Florian Weimer wrote:
> * Dan Čermák:
> 
> > it has been recently proposed to switch openSUSE to run ldconfig via a
> > %transfiletriggerin/-un scriptlet instead of manually in %post & %postun
> > the same way as Fedora does it at the moment.
> >
> > However, an interesting issue has been raised: what happens if package A
> > gets upgraded in the same transaction as package B, but B needs A during
> > the upgrade. A will install a new shared library, but ldconfig will run
> > after B has already tried to upgrade.
> 
> Fedora ships the soname links in the package, addressing this issue.
> For example, openssl-libs contains:
> 
> /usr/lib64/libcrypto.so.1.1
> /usr/lib64/libcrypto.so.1.1.1k
> /usr/lib64/libssl.so.1.1
> /usr/lib64/libssl.so.1.1.1k
> 
> As a result, running ldconfig is purely an optimization.
> 
> There are some packages that install fails into /etc/ld.so.conf.d, and
> such packages still have to run ldconfig explicitly.  (We should perhaps
> move those shared objects to /usr/lib64, too.)

Did anyone measure if ldconfig caching is actually useful on
modern machines?

Rich.

-- 
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