bug#30662: Borg crashes when run with python-msgpack > 0.4.6

[Leo Famulari]

On Wed, Feb 28, 2018 at 10:18:17PM -0500, Leo Famulari wrote:
> Borg fails to create new backups ("archives") with python-msgpack later
> than 0.4.6:
> 
> ------
> Traceback (most recent call last):
>   File 
> "/gnu/store/14v77f8h72z5qvzl74m5rv0pkkrk1l5s-borg-1.1.4/bin/.borg-real", line 
> 6, in <module>
>     from pkg_resources import load_entry_point
>   File 
> "/gnu/store/3lkypf5wnsnvkaidhw0pv7k3yjfh1r9g-python-3.6.3/lib/python3.6/site-packages/pkg_resources/__init__.py",
>  line 3017, in <module>
>     @_call_aside
>   File 
> "/gnu/store/3lkypf5wnsnvkaidhw0pv7k3yjfh1r9g-python-3.6.3/lib/python3.6/site-packages/pkg_resources/__init__.py",
>  line 3003, in _call_aside
>     f(*args, **kwargs)
>   File 
> "/gnu/store/3lkypf5wnsnvkaidhw0pv7k3yjfh1r9g-python-3.6.3/lib/python3.6/site-packages/pkg_resources/__init__.py",
>  line 3030, in _initialize_master_working_set
>     working_set = WorkingSet._build_master()
>   File 
> "/gnu/store/3lkypf5wnsnvkaidhw0pv7k3yjfh1r9g-python-3.6.3/lib/python3.6/site-packages/pkg_resources/__init__.py",
>  line 659, in _build_master
>     ws.require(__requires__)
>   File 
> "/gnu/store/3lkypf5wnsnvkaidhw0pv7k3yjfh1r9g-python-3.6.3/lib/python3.6/site-packages/pkg_resources/__init__.py",
>  line 967, in require
>     needed = self.resolve(parse_requirements(requirements))
>   File 
> "/gnu/store/3lkypf5wnsnvkaidhw0pv7k3yjfh1r9g-python-3.6.3/lib/python3.6/site-packages/pkg_resources/__init__.py",
>  line 853, in resolve
>     raise DistributionNotFound(req, requirers)
> pkg_resources.DistributionNotFound: The 'msgpack-python>=0.4.6' distribution 
> was not found and is required by borgbackup
> ------
> 
> I'll create a python-msgpack-0.4.6 package as a quick fix as soon as I
> get a bug number from debbugs.

Actually, that's not what's going on. Taking a closer look...

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