Re: [gentoo-user] update fails, but I don't see why [PROGRESS]

[n952162 <n952162@web.de>]

On 12/30/20 1:05 AM, Michael wrote:
> On Tuesday, 29 December 2020 22:55:03 GMT Neil Bothwick wrote:
>> On Tue, 29 Dec 2020 23:16:11 +0100, n952162 wrote:
>>>> So, I tried to do an emerge on @system.  I got another slot conflict!
>>>> This time for mako, which I'd seen go by sometimes as a "package of
>>>> interest".  It's only transgression: PYTHON_TARGET containing
>>>> python3_7.
>>> Note that both the "scheduled for merge" depender and the "installed"
>>> depender both required the same version of mako, 1.1.1-r1.  The only
>>> difference is the fact that one requirements specification has
>>> python3-7, the other python3-8.  The same pkg, the same binaries.
>>> Something is wrong here.  Why is it not good enough to specify python3?
>> PYTHON_TARGET determines for which version(s) of Python a package
>> installs its modules. The modules may be identical, but 3.7 and 3.8 have
>> different search paths, e.g. /usr/lib/python3.7/site-packages vs.
>> /usr/lib/python3.8/site-packages.
>>
>> It is possible you have some old python_targets settings in package.use,
>> that's where I would check first.
> As discussed recently, removing any manually configured python targets and
> letting portage work its magic, rather than fighting against it, is usually a
> sound way to get out of such a muddle.
>
> I sync'ed portage a few hours ago today.  Neither mako, nor setuptools require
> anything other than python3_8 on this system:
>
> $ eix -l setuptools
> [I] dev-python/setuptools
>       Available versions:
>              46.4.0-r3 ^t	[test PYTHON_TARGETS="pypy3 python2_7
> python3_6 python3_7 python3_8 python3_9"]	["|| ( python_targets_pypy3
> python_targets_python2_7 python_targets_python3_6 python_targets_python3_7
> python_targets_python3_8 python_targets_python3_9 )"]
>              50.3.0    ^t	[test PYTHON_TARGETS="pypy3 python3_6
> python3_7 python3_8 python3_9"]	["|| ( python_targets_pypy3
> python_targets_python3_6 python_targets_python3_7 python_targets_python3_8
> python_targets_python3_9 )"]
>         ~    51.0.0    ^t	[test PYTHON_TARGETS="pypy3 python3_6
> python3_7 python3_8 python3_9"]	["|| ( python_targets_pypy3
> python_targets_python3_6 python_targets_python3_7 python_targets_python3_8
> python_targets_python3_9 )"]
>         ~    51.1.0    ^t	[test PYTHON_TARGETS="pypy3 python3_6
> python3_7 python3_8 python3_9"]	["|| ( python_targets_pypy3
> python_targets_python3_6 python_targets_python3_7 python_targets_python3_8
> python_targets_python3_9 )"]
>       Installed versions:  50.3.0^t(12:47:38 05/12/20)(-test
> PYTHON_TARGETS="python3_8 -pypy3 -python3_6 -python3_7 -python3_9")
>       Homepage:            https://github.com/pypa/setuptools https://pypi.org/
> project/setuptools/
>       Description:         Collection of extensions to Distutils
>
>
> $ eix -l mako
> [I] dev-python/mako
>       Available versions:
>              1.1.3-r1  ^t	[doc test PYTHON_TARGETS="pypy3 python3_6
> python3_7 python3_8 python3_9"]	["|| ( python_targets_pypy3
> python_targets_python3_6 python_targets_python3_7 python_targets_python3_8
> python_targets_python3_9 )"]
>       Installed versions:  1.1.3-r1^t(13:09:34 05/12/20)(-doc -test
> PYTHON_TARGETS="python3_8 -pypy3 -python3_6 -python3_7 -python3_9")
>       Homepage:            https://www.makotemplates.org/ https://pypi.org/
> project/Mako/
>       Description:         A Python templating language
>
> ...


Well, yes, the current version, indeed requires python3_8.  The version
that was installed on my system, however, to be updated, listed
python3_7 in the PYTHON_TARGETS section.  That was the only difference
between the two packages in the collision.  It apparently disqualified
the update with a slot conflict.