[CentOS-devel] yum update behavior plugin

[Charlie Brady]

On Sun, 13 Aug 2006, Karanbir Singh wrote:

> Charlie Brady wrote:
>>> Well, plugin to remove all packages but yum, if yum is within updated 
>>> packages, is easy to write. But plugin can only stop yum execution and I 
>>> can't see way to run yum again after yum update by itself.
>> 
>> I don't see why yum couldn't update yum, then exec the new yum program, 
>> listing the remaining packages as install arguments. You'd need to unlock 
>> the lock file before calling execve.
>
> no! yum, on re-entry, needs to re-parse the metadata - its possible remote 
> end metadata has changed for the new yum as well.

For a while I couldn't see what you were saying "no!" to - certainly my 
assertion about the lock file is true.

OK, so you want the first yum to exec a new yum with the same arguments 
that it itself was called with. It will then calculate its own transaction 
set.

Hopefully it will not itself try to replace itself with the old yum 
package.

---
Charlie