How to Reverse a Yum Update

[Jeff Vian]

On Sun, 2005-07-24 at 22:14 -0400, Sam Varshavchik wrote:
> Ping-Wu Zhang writes:
> 
> > After a yum update, suppose something goes wrong and I want to revert
> > back to the state before the yum update, how do I do that?  Thanks
> 
> If you preserved the list of all the packages that yum updated, you can work 
> backwords and derive from it a list of all the packages that were removed.
> 

By default the list of updated packages is in /var/log/yum.log
>From there a list of updated packages is easy to see.

> If you did not preserve a list, something like:
> 
> rpm -q -a --queryformat '%{INSTALLTIME} %{NAME}-%{VERSION}-%{RELEASE}\n' | sort -n
> 
> gives the list of all installed packages, sorted by installation time. I 
> suppose that on x86_64 you'll need to throw an %{ARCH} in there, also.
> 
> Examining the timestamps at the end of the list you should be able to 
> determine which batch of packages were installed recently.
> 
> Then, you cross-reference that list of packages against the contents of the 
> installation disks and update channels, and come up with the list of 
> packages that were removed.
> 
> Then, you'll have to manually reinstall the older versions of each package, 
> using the right combination of magic flags that tell rpm to accept an 
> “upgrade” to an older version of each package.  This is not an automatic 
> process -- this is manual, tedious grunge work.
> 
> 
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