Re: Updated PEP 394 (python and python2 commands)
On 18.05.2018 05:19, Piotr Ożarowski wrote:
> [Matthias Klose, 2018-05-17]
>> PEP 394 [1] saw an update in April 2018 [2], the diffs at [3].
>>
>> The most important change from my point of view is
>>
>> -* It is suggested that even distribution-specific packages follow the
>> - ``python2``/``python3`` convention, even in code that is not intended to
>> +* It is strongly encouraged that distribution-specific packages use ``python2``
>> + or ``python3`` rather than ``python``, even in code that is not intended to
>> operate on other distributions.
>
> FTR: the day this PEP asks us to point /usr/bin/python to python3 is the
> day I start ignoring it, to say the least.
>
>> I don't think there is enough time to replace all python shebangs to python2 in
>> time for the buster release, however there is no harm in starting this process
>> now.
>
> too late, this process has already started (since dh_python2 v3.20180313) ;-P
>
>> But I'd like to get this done for buster+1, in the case we still need to
>> ship a Python2/2.7, so that buster+1 doesn't ship with a python command, but
>> maybe with a python2 command.
>
> we already ship /usr/bin/python2. Removing /usr/bin/python makes sense
> as well (administrators can symlink it to whatever they want once it's
> gone from Debian), but...
>
>> The first step is to create a set of python2* packages in python-defaults, with
>> contain all the python2* symlinks, and having the python* packages depend on
>> those python2 packages. This change itself is a no-op and shouldn't affect
>> anything.
>>
>> As a second step change the dh_python2 (in python-defaults), and dh-python to
>> generate dependencies on python2 instead of python, and replacing the shebang
>> from python to python2.
>>
>> This should cover the majority of packages to replace dependencies on python
>> with dependencies on python2. There are packages which don't check for python2,
>> so these probably need adjustments. But again, the goal for buster+1 is to ship
>> as few Python2 dependent packages as possible, if any.
>
> this is useless. What will we gain by renaming packages?
who said, that we should rename packages? The only packages being dropped are
the python defaults packages.
>
> I refuse to do that work!
There is no work in renaming the packages. It's about the dependency generation
and the shebang.
> The only message it sends is that we don't think /usr/bin/python or
> python package is Python 2.7 anymore and that's definitely not the
> message I want to send.
No, that's not what the PEP says.
Matthias
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