On Thu, 4 Dec 2008, devzero2000 wrote: > On Thu, Dec 4, 2008 at 10:30 AM, Panu Matilainen > <pmatilai@xxxxxxxxxxxxxxx> wrote: > > On Tue, 25 Nov 2008, devzero2000 wrote: > > > >> On Mon, Nov 24, 2008 at 8:36 PM, Seth Vidal > <skvidal@xxxxxxxxxxxxxxxxx> > >> wrote: > >> > >> > >> On Mon, 24 Nov 2008, Valery Reznic wrote: > >> > >> > Did you try to use Obsolete tag ? > >> > > >> > >> a couple of things about the whole thread > >> > >> 1. obsolete does not work when you're rpm -i'ing pkgs. Only rpm -U > >> > >> 2. modifying the rpmdb from a %post or %pre is an unsafe idea and > >> prone to > >> causing things to "end badly". > >> > >> > >> It depends. If Jeff tell it is possible to have an "RPM bundle" (e.g. > an > >> rpm that install rpm(s) itself) then perhaps > >> it is not so unsafe in first place. I personally have written un rpm > that > >> use yum for pull update. > > > > It "works", except when it doesn't. If you can make sure the bundle is > > only ever installed in a transaction of it's own, without --root, it'll > > probably work just fine. But "rpm from within rpm" does break in some > > cases, for example certain chroot install scenarios and more esoteric > > cases such as glibc futex implementation changing in the same > transaction. > > And the breakage will always happen when you least expect it ;) > > I must therefore imagine that the ability to " concurrent access" of rpm > it is wrong. > > i.e. rpm --showrc > ....... > > Features supported by rpmlib: > rpmlib(VersionedDependencies) = 3.0.3-1 > PreReq:, Provides:, and Obsoletes: dependencies support versions. > rpmlib(ConcurrentAccess) = 4.1-1 > package scriptlets may access the rpm database while installing. > > For me it is only little documented. But if it is thus harmful, it can > sure itself be removed if you think so. > > But sometime it is a useful feature (for me almost) . For example there > exists cases of installation of RPM products proprietary that do not > mandate rpm dependencies but that they work only if installed in a > precise order. A rpm bundle it is a way for solving this problem. Didn't say it was not useful, I only warned about the very real pitfalls. Rpm bundles are likely to work just fine for the "download an rpm-bundle off a website and install with rpm -Uvh". The trouble enters in more complex cases, such as glibc (or rpm itself) getting upgraded in the same transaction. - Panu - _______________________________________________ Rpm-list mailing list Rpm-list@xxxxxxxxxxxxx http://lists.rpm.org/mailman/listinfo/rpm-list
