> Also, on build failure, it would be nice to print a hint on what to
> invoke to get to the failed build log after all (guix-daemon still wrote
> it).

Indeed.  Is there such a command?

What about adding a hint, for instance:

 Building /gnu/store/i0kxn9cpkw8ml5472s185kxa6n64kmir-webkitgtk-2.20.5.drv - x86_64-linux
+Saving log at /var/log/guix/i0/kxn9cpkw8ml5472s185kxa6n64kmir-webkitgtk-2.20.5.drv.bz2
 starting phase `set-SOURCE-DATE-EPOCH'

This would be doubly useful:

- It makes it explicit to all users, without having to consult the manual or
some `--help` message.

- With Eshell or M-x shell, we can directly find-file the log at point.

-- 
Pierre Neidhardt
https://ambrevar.xyz/