Re: [RFC][PATCH] bitbake: fetch2: fix warning while switching from master to krogoth

[Richard Purdie <richard.purdie@linuxfoundation.org>]

On Fri, 2016-07-29 at 11:23 +0300, Maxin B. John wrote:
> While switching from master to krogoth build with a common download
> directory,
> got a large number of warnings like the one listed below:
> 
> WARNING: freetype-2.6.3-r0 do_fetch: Couldn't load checksums from
> donestamp /home/maxin/downloads/freetype-2.6.3.tar.bz2.done:
> ValueError
> (msg: unsupported pickle protocol: 4)
> 
> These warnings are caused by the difference in pickle module
> implementation in python3(master) and python2(krogoth). Python2
> supports
> 3 different protocols (0, 1, 2) and pickle.HIGHEST_PROTOCOL is 2
> where as
> Python3 supports 5 different protocols (0, 1, 2, 3, 4) and
> pickle.HIGHEST_PROTOCOL is obviously 4.
> 
> My suggestion is to use 2 since it is backward compatible with
> python2
> (all the supported distros for krogoth provides python2 which
> supports
> pickle protocol version 2)

This looks good to me, well spotted. I've merged it since the
autobuilder is likely spending a lot of time churning sources around at
the moment due to this.

Ideally we'd use a better data format in these files so I'd welcome
other improvements but this fixes the immediate problem.

Cheers,

Richard