Unsupported system type status error message misleading

[Atemu]

~10000 jobs for the experimental armv7l jobset (which is basically all of them) started failing with the status error message "Unsupported system type" 3 days ago.

I asked @grahamc on IRC about it and he told be it happened because no armv7 builders became available in time.

That is a thing that can happen of course but the error message sounds nothing like the actual error to me. "Timed out while waiting for available builders" (or something along those lines) would be much clearer.

The jobs' failures are also propagated onto subsequent builds which doesn't make a lot of sense since the error is most likely to be a temporary outage of the infrastructure, not a problem of the actual build.

I'm not too familiar with Hydra yet to but this might be a duplicate of #40.

[edolstra]

Hydra cannot distinguish between system types not being available right now or never being available, since provisioning of those machines happens outside of Hydra.

[Atemu]

Does it wait for a machine to show up in a certain time limit or does it fail immediately?

[edolstra]

It waits for max_unsupported_time seconds, but that option defaults to zero so it fails immediately.