On Thu, 2008-04-17 at 18:00 -0600, Stephen Warren wrote: > I have a question re: how yum determines which package to install when > they both provide the same thing. > > Specifically, I have: > > unison213 > obsoletes: > unison < 2.27.57-3 > provides: > unison = 2.13.16-9.fc8.3 > unison213 = 2.13.16-9.fc8.3 This obsoletes itself, which recent versions of yum should handle better ... but is still "interesting" to say the least. > unison227: > obsoletes: > unison < 2.27.57-3 > provides: > unison = 2.27.57-7.fc8.3 > unison227 = 2.27.57-7.fc8.3 > > (Equally, I hit the same issue if unison213 does not provide "unison", > just "unison213".) > > If those two packages are in a repository, and I type: > > yum install unison Which version of yum matters _a lot_ here. I'm pretty sure that yum-3.2.14-10 (current Fedora 9 candidate) will pick unison227, due to that obsoleting unison213 but not being obsoleted by it. If the obsoleting _doesn't_ come into play, for some reason, then it will basically pick randomly atm. with maybe a slight preference for whichever is first in the repo MD. Doing a full version comparison over all provides of each package, is possible but unlikely to happen unless it's 100% required. Always picking the alphasorted highest/lowest pkg is also possible, if that needs to be done. But the most obvious fix is to remove the self obsoletes on the first package. > then I *expect* yum to see that both unison213 and unison227 provide > unison, and pick the package that provides the highest version number, and > install it. > > However, what actually happens is that yum picks unison213 to install. > > I'm not sure if yum is picking: > * The first package it finds > * The "first" package by some sorting order that matches > * Some random package (although it's consistent) > > Can anybody shed any light? There are a few tests now, if you need to know all the details, it probably means doom, but you want to see _compare_providers() in depsolve.py -- James Antill <james@xxxxxxxxxxxxxxxxx> Fedora -- fedora-devel-list mailing list fedora-devel-list@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/fedora-devel-list
