bob v0.5.0 and easy full-tree scans

[Jonathan Perkin <jperkin%pkgsrc.org@localhost>]

One comment I've heard a number of times over the years is how hard it 
is to perform a full pkgsrc tree scan to identify dependency issues 
that will break bulk builds, and how slow the scans are.

I agree, so I'm happy to say that with bob v0.5.0 which dropped a few 
minutes ago this should be much much simpler, and a lot faster.  Here's 
an example config and session, using latest pkgsrc from a few minutes 
ago:

  https://gist.github.com/jperkin/c4e461df22eadbdb0fe982944b0b7103

Just over 4 minutes on my 2021 MacBook to perform a full scan from 
scratch, and no need to set up sandboxes etc.

This should be 100% compatible with pbulk, and I've optimised the 
resolver so that it runs a lot faster.  Comparing against the same 
'pscan' file, pbulk-resolve takes 66.6 seconds while bob took just 
2.1 seconds, with identical output.

If you'd like any additional functionality for the scan phase just let 
me know.  Oh, and if someone could fix the php-imap issue that'd be grand 
;)

Thanks,

--
Jonathan Perkin                    pkgsrc.smartos.org
Open Source Complete Cloud   www.tritondatacenter.com