[Centos] Using yum to do downgrades
skvidal at phy.duke.edu
Tue Sep 14 23:51:55 UTC 2004
> Basically I am attempting a Red Hat 7.2 -> CentOS-2 upgrade. So far it
> has worked like a charm. The problem is though that yum (no doubt by
> design) will not downgrade packages to the CentOS versions.
> The problem is that some old RPMs have 72 in the release (for Red Hat
> 7.2) and the newer package as 21 in the release (For Enterprise Linux
> 2.1). Some others are updates to 7.2 which increased the version number
> where as 2.1 got a backported fix and increased release number.
which is what happens when something branches earlier.
> Is there a way to make yum always select a particular Vendor or
> Distribution? What about using yum to do an explicit downgrade
> "yum install mypackage-version-oldrelease"?
not for yum 1.0.X or 2.0.X. 2.1.x can but it's not going to work on a
rhl 7.2 or rhel2.1 one system.
> Also, this is an rpm question, does anyone know if I can do
> "rpm --erase redhat-logos" and "rpm -i centos-logos" at the same time?
rpm --erase --nodeps redhat-logos ; rpm -i centos-logos
they'll only be logo-free for a brief moment :)
> If I put an obsoletes: tag into centos-logos will yum do that for me?
> Is that a good idea?
yum upgrade will do obsoletes, yes.
> At the moment I have a bash script which trys to work out the downgrade
> rpm commands but I can not check dependencies. Any other suggestions,
> tips or tricks would be appreciated.
it's not hard to do a version comparison on any package in the tree
versus those installs and you could do: rpm -Uvh --oldpackage stuff
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