Didn't the CentOS Vault repo ensure that every package ever published was still 
available?

> On 7 Jan 2021, at 07:03, Gordon Messmer <gordon.mess...@gmail.com> wrote:
> 
> On 1/6/21 8:01 PM, Strahil Nikolov via CentOS wrote:
>> - No chance to "yum history undo last" as there are no older packages
> 
> 
> I've seen that mentioned as a change pretty frequently, but I don't think it 
> is in any meaningful sense.
> 
> In CentOS Stream, package versions may be rebased periodically, and the 
> public repos will no longer have older packages to install when using "undo" 
> or "rollback".
> 
> In CentOS, package versions may be rebased at minor releases, and the public 
> repos will no longer have older packages to install when using "undo" or 
> "rollback".
> 
> It's true that you might be able to roll back a simple patch in CentOS in 
> between minor releases, but those are the updates that everyone seems to 
> regard as being the safest, and least likely to cause problems, and therefore 
> the least likely to need undo/rollback.  The only rational conclusion I can 
> come to is that it doesn't matter if you're talking about CentOS today or 
> Stream in the future: If you want to be able to roll back, you need a private 
> mirror that keeps the package versions that you use.  If you don't want a 
> mirror, then you need to build, test, and deploy complete images rather than 
> making incremental changes to mutable systems.  None of this is new, it's 
> always been this way and people have just accepted it.
> 
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