DMARC-Filter: OpenDMARC Filter v1.4.1 sourceware.org D62FA3858C60
Message-ID: <c35bf2df-a0c4-4fc1-a217-867df103a97a@gmail.com>
Date: Thu, 23 Dec 2021 09:50:54 +0100
MIME-Version: 1.0
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:91.0) Gecko/20100101
 Thunderbird/91.4.1
Subject: Re: python3.9 failing?
Content-Language: it
To: Russell VT <russellvt@gmail.com>
References: <f5b1r26m7a2.fsf@ecclerig.inf.ed.ac.uk>
 <67c4a4f1-3189-e85a-0719-c05a1096a0d6@gmail.com>
 <87k0fykrqm.fsf@Rainer.invalid>
 <CANV2+nWPJE83rryNzJwwVNsKYbzvJnKV9GZ93ERzD95Zpb7QJg@mail.gmail.com>
 <2839cd60-8219-4b9a-b967-9519a36d247e@gmail.com>
 <CANV2+nW3r877DAvgGuwy1HHWk0q4f-XDpKcvOq5k2g3s=yU8sQ@mail.gmail.com>
From: Marco Atzeri <marco.atzeri@gmail.com>
In-Reply-To: <CANV2+nW3r877DAvgGuwy1HHWk0q4f-XDpKcvOq5k2g3s=yU8sQ@mail.gmail.com>
Precedence: list
Cc: cygwin@cygwin.com
Content-Type: text/plain; charset="utf-8"; Format="flowed"
Errors-To: cygwin-bounces+archive-cygwin=delorie.com@cygwin.com
Sender: "Cygwin" <cygwin-bounces+archive-cygwin=delorie.com@cygwin.com>
Content-Transfer-Encoding: 8bit

On 23.12.2021 09:28, Russell VT wrote:
> On Thu, Dec 23, 2021 at 12:52 AM Marco Atzeri > wrote:
> 
>     On 23.12.2021 06:50, Russell VT wrote:
>      > On Tue, Dec 21, 2021 at 6:34 AM Achim Gratz <Stromeko@nexgo.de
>     <mailto:Stromeko@nexgo.de>> wrote:
>      >
>      >> Marco Atzeri writes:
>      >>> Without Python 3.9  installed python3 should link by default to the
>      >>> next in the line (likely 3.8)
>      >>
>      >> While python3 still defaults to python38 alternatives should
>     probably
>      >> prioritize 38 over 39?
>      >
>      >
>      > That's how I "fixed" mercurial on my own installation, as it was
>      > complaining about missing the "parsers" module, from inside the
>     Python 3.9
>      > libraries, IIRC.
> 
>     Thanks for the report.
>     It is caused by:
> 
>     $ head /usr/bin/hg -n 20
>     #!/usr/bin/python3
>                        ^^ default 3.9
>     ....
> 
>     libdir = '../lib/python3.8/site-packages'
>                              ^^ but really need 3.8
> 
> 
> Thanks... python3 defaults to whatever you have "alternatives" set to... 
> looks like python's libdir doesn't quite obey those alternatives, though?

not in this case as Mercurial is not version agnostic
and it is setting its own specific "libdir"

$ cygcheck -l mercurial | grep "usr/lib" | head
/usr/lib/python3.8/site-packages/hgdemandimport/demandimportpy2.py
/usr/lib/python3.8/site-packages/hgdemandimport/demandimportpy3.py
..

>     No surprise is not working.
> 
>     A simple workaround is:
> 
> 
> Simpler (and more-complete) workaround is:
> 
>     % /usr/sbin/alternatives.exe --set python3 /usr/bin/python3.8

my workaround solve the specific hg issue,  until its repacking.

Alternatives can not support two different programs that need different 
version


> Cheers -
> RVT

Regards
Marco


-- 
Problem reports:      https://cygwin.com/problems.html
FAQ:                  https://cygwin.com/faq/
Documentation:        https://cygwin.com/docs.html
Unsubscribe info:     https://cygwin.com/ml/#unsubscribe-simple