> 
> When everything goes fine, no email notification is being sent out.  A 
> convenient log structure would, however, make it possible to see which 
> packages and USE-flag combinations successfully passed through. 
> Providing this log via a web-page would be a useful thing.

Would tinderbox help?

> - Comments are welcome, as well as expressions of worry on my mental state.

Good thinking!

The chroot idea is a good one because the process lends itself to 
parallelism. That is, you might have one test box/chroot for, (maybe in 
order of importance)

- unstable empty tree (all deps every time)
- stable empty tree builds (same)
- unstable cumulative tree builds
- stable cumulative tree builds

I see the last ones as being fairly important, because the cumulative 
(emerge -Du) trees will have the best throughput, for quicky finding any 
glaring, slap-forehead kind of bugs/bad keywords (i.e. low fruit).

The cumulative tree machines would also be an efficient choice for your 
reverse-dependency idea (perhaps to only one level of indirection).

-f
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