[gentoo-user] python 3.1 safe as default python?

[gentoo-user] python 3.1 safe as default python?

[Doug Hunley]

I noticed that my 'emerge world' wants to replace python 2.6.2 with
python 3.1 (I run ~x86). Is it safe to do so or will portage (and
everything else) freak out? If it is, in fact, safe are there any
extra (special) steps needed to ensure continued operation of things?
Thanks.

-- 
Douglas J Hunley, RHCT
doug.hunley@gmail.com : http://douglasjhunley.com : Twitter: @hunleyd

Obsessively opposed to the typical.

[gentoo-user] Re: python 3.1 safe as default python?

[Nikos Chantziaras]

On 08/02/2009 06:17 PM, Doug Hunley wrote:
> I noticed that my 'emerge world' wants to replace python 2.6.2 with
> python 3.1 (I run ~x86).

Nope, it does not :)  It only wants to install it alongside 2.6.x, not 
replace it.


> Is it safe to do so or will portage (and
> everything else) freak out? If it is, in fact, safe are there any
> extra (special) steps needed to ensure continued operation of things?
> Thanks.

No danger.  The default will still be 2.6.x.  If you don't specifically 
need 3.1 though, you can simply mask it since the only thing it will do 
in your case is take up disk space.

Re: [gentoo-user] python 3.1 safe as default python?

[Neil Bothwick]

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On Sun, 2 Aug 2009 11:17:22 -0400, Doug Hunley wrote:

> I noticed that my 'emerge world' wants to replace python 2.6.2 with
> python 3.1 (I run ~x86). Is it safe to do so or will portage (and
> everything else) freak out? If it is, in fact, safe are there any
> extra (special) steps needed to ensure continued operation of things?

t does not replace python 2.6, it installs in a separate slot. Python 2.6
remains the default as many modules don't yet work with 3.

This is given in the elog message, but of course you have to be
brave/foolish enough to emerge it to see that. So yes, it is safe to
allow python 3.1 to install.


-- 
Neil Bothwick

I thought I saw the light at the end of the tunnel...
but it was just some sod with a torch bringing me more work!

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Re: [gentoo-user] python 3.1 safe as default python?

[Albert Hopkins]

On Sun, 2009-08-02 at 11:17 -0400, Doug Hunley wrote:
> I noticed that my 'emerge world' wants to replace python 2.6.2 with
> python 3.1 (I run ~x86).

It doesn't "replace" 2.6.2.  It's slotted.

>  Is it safe to do so or will portage (and
> everything else) freak out? 

I would think (hope) that the python maintainers were smart enough to
know whether installing Python 3 would break portage.  Then again, this
is Gentoo ;-)

> If it is, in fact, safe are there any
> extra (special) steps needed to ensure continued operation of things?
> Thanks.

>From the ebuild's post-install:

        WARNING!
        Many Python modules haven't been ported yet to Python 3.*.
        /usr/bin/python hasn't been updated and still references your
        old Python installation.

[gentoo-user] Re: python 3.1 safe as default python?

[Christer Ekholm]

Albert Hopkins <marduk@letterboxes.org> writes:

> On Sun, 2009-08-02 at 11:17 -0400, Doug Hunley wrote:
> I would think (hope) that the python maintainers were smart enough to
> know whether installing Python 3 would break portage.  Then again, this
> is Gentoo ;-)

Just installing it doesn't break portage. But using it does! :)

  19:14:44 poke:~ $ eselect python list
  Available python interpreters:
    [1]   python2.6
    [2]   python3.1
  19:17:24 poke:~ $ sudo eselect python set 2
  19:17:31 poke:~ $ emerge --info
    File "/usr/bin/emerge", line 41
      except PermissionDenied, e:
                             ^
  SyntaxError: invalid syntax

--
 Christer

Re: [gentoo-user] Re: python 3.1 safe as default python?

[Keith Dart]

=== On Sun, 08/02, Christer Ekholm wrote: ===
> Just installing it doesn't break portage. But using it does! :)

===

That's probably why it's there now. ;-)

Thanks for the clarification everyone. I was wondering the same thing.


-- Keith Dart

-- 
-- --------------------
Keith Dart
<keith@dartworks.biz>
=======================

[gentoo-user] Re: python 3.1 safe as default python?

[Doug Hunley]

On Sun, Aug 2, 2009 at 17:07, Keith Dart<keith@dartworks.biz> wrote:
>> Just installing it doesn't break portage. But using it does! :)
>

Exactly. When I ran this (and then went for breakfast and coffee):
/usr/bin/eix-sync
/usr/bin/emerge --update --newuse --deep --keep-going --with-bdeps
y/usr/bin/emerge --update --newuse --deep --keep-going --with-bdeps y
world
/usr/bin/emerge --depclean
/usr/bin/revdep-rebuild -C -P

I ended up with Python 3.1 and no 2.x which made a horrible mess. I
ended up having to manually download and install Python 2.x into /opt
and pointing /usr/bin/python to it to get things functional enough
again to re-emerge the 2.6 release. So, ok, maybe it doesn't 'replace'
it, but something sure as hell removed it, which is clearly the wrong
behavior since emerge depends on it. Please enlighten me where I went
wrong as I'd rather not have such surprises in the morn. :)
-- 
Douglas J Hunley, RHCT
doug.hunley@gmail.com : http://douglasjhunley.com : Twitter: @hunleyd

Obsessively opposed to the typical.

Re: [gentoo-user] Re: python 3.1 safe as default python?

[Dale]

Doug Hunley wrote:
> On Sun, Aug 2, 2009 at 17:07, Keith Dart<keith@dartworks.biz> wrote:
>   
>>> Just installing it doesn't break portage. But using it does! :)
>>>       
>
> Exactly. When I ran this (and then went for breakfast and coffee):
> /usr/bin/eix-sync
> /usr/bin/emerge --update --newuse --deep --keep-going --with-bdeps
> y/usr/bin/emerge --update --newuse --deep --keep-going --with-bdeps y
> world
> /usr/bin/emerge --depclean
> /usr/bin/revdep-rebuild -C -P
>
> I ended up with Python 3.1 and no 2.x which made a horrible mess. I
> ended up having to manually download and install Python 2.x into /opt
> and pointing /usr/bin/python to it to get things functional enough
> again to re-emerge the 2.6 release. So, ok, maybe it doesn't 'replace'
> it, but something sure as hell removed it, which is clearly the wrong
> behavior since emerge depends on it. Please enlighten me where I went
> wrong as I'd rather not have such surprises in the morn. :)
>   

Most likely the --depclean removed it.  As someone else found out the
hard way, not all Gentoo package managers need python.  Therefore python
can be unmerged which causes a mess.  This is a good reason to NEVER
trust --depclean without giving the list a good looking over. 

Personally, I think there needs to be a way to tell portage that if you
have portage installed, python can not be removed without one heck of a
fuss by portage. 

Dale

:-)  :-) 

RE: [gentoo-user] Re: python 3.1 safe as default python?

[Adam Carter]

> Just installing it doesn't break portage. But using it does! :)
>
>   19:14:44 poke:~ $ eselect python list
>   Available python interpreters:
>     [1]   python2.6
>     [2]   python3.1
>   19:17:24 poke:~ $ sudo eselect python set 2
>   19:17:31 poke:~ $ emerge --info
>     File "/usr/bin/emerge", line 41
>       except PermissionDenied, e:
>                              ^
>   SyntaxError: invalid syntax

Did you try it as root? Is your user in the portage group?

Re: [gentoo-user] Re: python 3.1 safe as default python?

[Mike Kazantsev]

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On Sun, 02 Aug 2009 19:01:20 -0500
Dale <rdalek1967@gmail.com> wrote:

> Most likely the --depclean removed it.  As someone else found out the
> hard way, not all Gentoo package managers need python.  Therefore python
> can be unmerged which causes a mess.  This is a good reason to NEVER
> trust --depclean without giving the list a good looking over. 

For that to happen, emerge must've set it as "default python" instead
of 2.6, otherwise dependencies (e.g. from sys-apps/portage itself)
wouldn't let this happen.

-- 
Mike Kazantsev // fraggod.net

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[gentoo-user] Re: python 3.1 safe as default python?

[Christer Ekholm]

Adam Carter <Adam.Carter@optus.com.au> writes:

>> Just installing it doesn't break portage. But using it does! :)
>>
>>   19:14:44 poke:~ $ eselect python list
>>   Available python interpreters:
>>     [1]   python2.6
>>     [2]   python3.1
>>   19:17:24 poke:~ $ sudo eselect python set 2
>>   19:17:31 poke:~ $ emerge --info
>>     File "/usr/bin/emerge", line 41
>>       except PermissionDenied, e:
>>                              ^
>>   SyntaxError: invalid syntax
>
> Did you try it as root? Is your user in the portage group?

Yes, and yes.

  02:03:10 poke:~ $eselect python list
  Available python interpreters:
    [1]   python2.6
    [2]   python3.1
  02:22:30 poke:~ $sudo eselect python set 2
  02:22:39 poke:~ $sudo emerge --info
    File "/usr/bin/emerge", line 41
      except PermissionDenied, e:
                             ^
  SyntaxError: invalid syntax
  02:22:50 poke:~ $id
  uid=1001(che) gid=100(users) groups=4(adm),10(wheel),16(cron),18(audio),19(cdrom),27(video),35(games),81(apache),100(users),250(portage)

I think that the comma on line 41 in /usr/bin/emerge is simply not valid
in python-3

Re: [gentoo-user] Re: python 3.1 safe as default python?

[Mike Kazantsev]

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On Mon, 3 Aug 2009 10:15:19 +1000
Adam Carter <Adam.Carter@optus.com.au> wrote:

> > Just installing it doesn't break portage. But using it does! :)
> >
> >   19:14:44 poke:~ $ eselect python list
> >   Available python interpreters:
> >     [1]   python2.6
> >     [2]   python3.1
> >   19:17:24 poke:~ $ sudo eselect python set 2
> >   19:17:31 poke:~ $ emerge --info
> >     File "/usr/bin/emerge", line 41
> >       except PermissionDenied, e:
> >                              ^
> >   SyntaxError: invalid syntax
> 
> Did you try it as root? Is your user in the portage group?

It really is python SyntaxError, not permission problem: python3 doesn't
even began to execute this code and it won't do that, as long as code
contains that line, since it should be "except PermissionDenied as e"
for py3.

-- 
Mike Kazantsev // fraggod.net

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Re: [gentoo-user] Re: python 3.1 safe as default python?

[Neil Bothwick]

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On Sun, 2 Aug 2009 19:35:52 -0400, Doug Hunley wrote:

>  Please enlighten me where I went
> wrong as I'd rather not have such surprises in the morn. :)

Updating world without first checking to see what will happen is asking
for trouble, running emerge --depclean without checking is sending it a
hand-delivered invitation on a velvet cushion..

Having said that, as Mike said, this should not have removed
python:2.6, ad it didn't try to do so here.


-- 
Neil Bothwick

OPERATOR ERROR: Nyah, Nyah, Nyah, Nyah, Nyah!

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Re: [gentoo-user] Re: python 3.1 safe as default python?

[Keith Dart]

=== On Mon, 08/03, Christer Ekholm wrote: ===
> I think that the comma on line 41 in /usr/bin/emerge is simply not
> valid in python-3

===

Right.

http://docs.python.org/3.1/whatsnew/3.0.html


-- Keith Dart

-- 
-- --------------------
Keith Dart
<keith@dartworks.biz>
=======================