[Centos] Using yum to do downgrades

John Newbigin jn at it.swin.edu.au
Wed Sep 15 00:35:21 UTC 2004


Thanks for your reply.  I guess for now I will stick with my bash 
script.  I'll put it up on my web site
http://uranus.it.swin.edu.au/~jn/linux/centos-2/migration.htm

John.

seth vidal wrote:

>>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.
> 
> 
> yep. True.
> 
> 
> 
>>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
> 
> -sv
> 
> 
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> 


-- 
John Newbigin - Computer Systems Officer
School of Information Technology
Swinburne University of Technology
Melbourne, Australia
http://www.it.swin.edu.au/staff/jnewbigin




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