Re: [oe-core][PATCH] python3: add ${bindir}/python symlink

[Markus Volk <f_l_k@t-online.de>]

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I use a bbappend for python3 in meta-wayland for almost a year now 
because i had issues installing python scripts with /usr/bin/python 
shebang e.g. here in sway:
<https://github.com/swaywm/sway/blob/master/contrib/inactive-windows-transparency.py>

Issue has been that, if adding this script to do_install(), package_qa 
failed because of the missing /usr/bin/python provider.

Ran into this quite a few times in the past and then created the 
symlink instead of patching shebangs

I just wanted to mention, that having a symlink would be an alternative 
to patching shebangs and as i was asked to send a patch, i did. But I'm 
fine with whatever is done in oe-core.

Basically I also think the best solution would be, upstream would 
deprecate /usr/bin/python usage. Unfortunaltey it's not, and so there 
will always be people using it.

Am Di, 22. Nov 2022 um 17:41:22 +0000 schrieb Ross Burton 
<ross.burton@arm.com>:
> On 22 Nov 2022, at 04:42, Markus Volk via lists.openembedded.org 
> <f_l_k=t-online.de@lists.openembedded.org 
> <mailto:f_l_k=t-online.de@lists.openembedded.org>> wrote:
>>  On Mon, Nov 21 2022 at 06:48:07 PM +0100, Alexander Kanavin 
>> <alex.kanavin@gmail.com <mailto:alex.kanavin@gmail.com>> wrote:
>>>  On my Debian systems, indeed, /usr/bin/python is absent.
>> 
>>  Debian has a package for this
>>  <https://packages.debian.org/bookworm/python-is-python3>
> 
> And that’s a perfectly good solution that I like.
> 
> Personally, I think people should forget that /usr/bin/python exists: 
> the recommendation from Python is to call python2 or python3.  I can 
> quote from PEP-0394:
> 
> “””
> Depending on a distribution or system configuration, python may or 
> may not be installed. If python is installed its target interpreter 
> may refer to python2 or python3.”
> 
> …
> 
>     • Distributors may choose to set the behavior of the python 
> command as follows:
>         • python2,
>         • python3,
>         • not provide python command,
>         • allow python to be configurable by an end user or a 
> system administrator.
> “””
> 
> We’ve picked option 3.  As per Python upstream, that’s absolutely 
> fine.
> 
> If you have a serious need that /usr/bin/python exists, and is a 
> symlink to python3, then could you not make a simple recipe that 
> RDEPENDS on python3 and ships just a /usr/bin/python -> python3 
> symlink?  You can even put this in your layer to avoid having to 
> debate it with the oe-core maintainers.
> 
> Ross
> 
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