Thanks guys, I finally came to the conclusion that the problem was not the python code, but rather the applydeltarpm command that was touching the DB in some wrong way causing it to lockup. I confirmed this by writing a trivial yum plugin that only ran the command using direct on disk files, and yum still hung!
BTW, yes, the constructed rpm does pass all signature checks. I'm currently investigating what's causing the issue inside applydeltarpm.

On 1/25/07, Matthew Gillen <> wrote:
RPM's DB backend gets wedged sometimes.  It's become a lot less common than
it used to be, but it just happened to me again recently.  A solution (maybe
not the best) is to rebuild the database.  I have a script that does the
$ cat
rm -f /var/lib/rpm/__db*
rpm -vv --rebuilddb

The '-vv' makes it take longer, but I like it so that I can be sure it's
doing something.

Hope that helps,

Ahmed Kamal wrote:
> that does help, I can clear the lock without rebooting anymore! but, the
> rpm hanging still happens every time. Not sure what's causing the issue
> though.
> On 1/24/07, * Rex Dieter* <
> <>> wrote:
>     Ahmed Kamal wrote:
>     > I've been hacking on the code yesterday, and it seems I am hitting
>     > some sort of a bug.
>     ...
>     > But it should be rare! In my case, this happens everytime. And I have
>     > to reboot to clear the lock!
>     rm -f /var/lib/rpm/__db.*
>     doesn't work?
>     -- Rex
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