[Nix-dev] Troubles with Hydra's failure cache

[Eelco Dolstra]

Hi,

Michael Raskin wrote:

> Ludovic Courtès wrote:
>> How can it be handled?  Could Hydra be extended (fixed?) to distinguish
>> between build failures and transient failures like this?

Nix does try to distinguish between transient and permanent failures.  For
instance, fetchurl failures aren't cached.  But a failure due to the GC bug
appears as a permanent failure, so it's cached.  The solution is to fix the GC
bug ;-)

> Or at least a way to manually unremember build failure would be nice.

Yes, I can do that manually by logging in to the Hydra server and doing "rm
/nix/var/nix/db/failed/*", then restarting the build (that can actually be done
through the web interface).  That could be made a bit nicer: the restart button
in the web interface should get rid of the cached failures.

-- 
Eelco Dolstra | http://www.st.ewi.tudelft.nl/~dolstra/