Preupgrade does not verify downloaded packages -> upgrade fails badly

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I found during preupgrade process from F16 to F17 that preupgrade does not verify that the packages downloaded for the upgrade are not corrupted.

If any package is corrupted for any reason in preupgrade repo, this causes the upgrade process to fail somewhere in the middle, leaving system in unknown, often broken state.

Here is a bug I filled:
https://bugzilla.redhat.com/show_bug.cgi?id=830537

with a kind of patch I made.

It would probably be better for anaconda to verify packages before installation, though. Or is there any other method of package verifycation during preupgrade? For livecd, install dvd there is a media check (while it is not asked for by default now, which is IMHO not correct), but none for preupgrade I know about.


Adam Pribyl
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