[mythtv] Ad ticket #13567: Revise dependencies for packaging

[Mike Bibbings]

On 02/02/2020 15:26, Bill Meek wrote:
> On 2/2/20 6:47 AM, Paul Harrison wrote:
>> On 29/01/2020 19:03, Roland Ernst wrote:
>>
>>> I'd really like to have MythTV v31 for Debian/Ubuntu released
>>> without dependencies to python2.
>>>
>>> Current situation:
>>> The deb packages produced by 'ppa:mythbuntu/31' have dependencies
>>> to python2 but do not install the MythTV Python Bindings for
>>> python2, only for python3. Therefore, users do not have a working
>>> solution for the MythTV Python Bindings with python2 out of the box.
>>>
>>> Since the release notes for MythTV v31 at
>>> https://www.mythtv.org/wiki/Release_Notes_-_31
>>> marked python2 support as deprecated, is it enough to
>>> provide a user-script that installs the Python Bindings for
>>> python2 based on the already installed version for python3?
>>>
>>> This script could be placed on the wiki and linked from the
>>> official release notes with a notification, like
>>> "Debian/Ubuntu users still requiring python2 support need to
>>> follow instructions on..."
>>>
>>> This script will extract the installed Python3 Bindings and
>>> install it via "setup.py" for python2, either globally, or locally
>>> for the current user. Even a "python virtual environment" setup
>>> is possible in this case.
>>>
>>> I can provide this script, if agreed.
>>>
>>> Regards,
>>> Roland
>>
>>
>> Hi Roland,
>>
>>
>> I've committed the patches from #13567 and last nights master builds 
>> have completed OK. Even Focal, which has been failing since python2 
>> support was removed in Focal a week or two ago, build OK :). Thanks 
>> Roland!
>>
>>
>> As for the script Bill is probably the one to ask about that. My 
>> personal opinion is we should be encouraging users to switch to using 
>> the python3 bindings, the latest  version of most/all? distros are 
>> going to remove support for python2 so they wont have much choice 
>> soon. Maybe add your script to the wiki but make it clear it's only a 
>> short term solution that wont work in the near future?
>>
>>
>> Paul H.
>
> Hi Roland,
>
> My initial attempt was to modify the Makefile for the Python bindings 
> and have it detect
> if v3 and v2 were available. Then run setup.py for discovered Python 
> versions. I wasn't
> successful.
>
> So, I added this some time ago: 
> https://www.mythtv.org/wiki/Python3_Conversion#Install_both_sets_of_bindings
> and it's linked to from the release notes. It only works for those 
> building from source
> though.
>
> Roland, sounds like your script works for those not building from 
> source. I think it
> could live in the Python3_Conversion Wiki. If you don't have access to 
> the Wiki
> yet, email me a copy and I'll add it.
>
> For most of the time during the conversion, I ran with both v3 and v2 
> installed.
>
> As to my _deprecated_ comment in the release notes: I think it's still 
> true. But
> packagers make the decision. That way if there's a distro that doesn't 
> support
> v3, they can still choose v2.
>
> I posted a "Heads up" in the -users list and on the Forum.
>
>   https://lists.gt.net/mythtv/users/628768
>   https://forum.mythtv.org/viewtopic.php?f=30&t=3384
>
> I got one and two responses respectively. Could mean it's not going to 
> be an
> issue, OR that folks are planning to work things out when the move to 
> v31.
>
> My concern was for folks with private or Wiki tools that need 
> conversion (and may
> simply stop working on v31.)
>
Just a heads up, current mythtv-frontend from ppa:mythbuntu/31 will not 
install on Ubuntu 18.04 LTS as python3-imdbpy is not available.

Ticket raised https://code.mythtv.org/trac/ticket/13573#ticket


Mike