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On 5/5/25 10:39 AM, Grant Edwards wrote:

What's annoying about the Python upgrade this time is that the switch
to 3.13 apparently happened. Then an update or two later, emerge
starts balking because it wants to update packages that don't support
3.13. Now to get a normal daily update to "go" I have to switch _back_
to 3.12. That means about 250 packages have to be reinstalled after
disabling 3.13 in package.use.

Isn't there any sort of check that emerge can run _before_ the switch
happens to find out whether the switch is going to cause problems for installed packages?

Yes, emerge ran that check when you did the original switch.

Did you do the original switch without using @world?

Did you have packages installed that aren't in world, and you are now
trying to update?

Which packages is it trying to update that don't support 3.13? There is
very little we can do to help without details of the problem you are encountering. :)


--
Eli Schwartz

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To: perfinion@gentoo.org (Jason Zaman)

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On 5/5/25 11:53 AM, Grant Edwards wrote:

Which packages is it trying to update that don't support 3.13?

A coupled days after the May 1st switch, 'emerge -auvND world' refused
to run because libftdi didn't support 3.13.

I removed libftdi,

It has gotten 3.13 support on Sunday but erroneously did so via a
revbump and dropping keywords to ~arch.

If it was in world, though, then you would have had to resolve it on the
May 1st switch.

then it was bmap-tools (zugiana overla) that wasn't
happy.

This is in ::gentoo?

There's a handful of packages that you need a *build* dep on 3.12 for,
if you're going to do much with python. But unless you upgraded using "--with-bdeps=y" you should not have to have its build dependencies...
and bmap-tools hasn't been updated in a year and no other packages have
forced it to rebuild, so you shouldn't be having issues.

Since I have no idea how many packages are going to need to be
uninstalled or fixed with use-flags, I decided to try to "defer" the
update by putting these lines at the top of /etc/portage/package.use

*/* PYTHON_TARGETS: -* python3_12
*/* PYTHON_SINGLE_TARGET: -* python3_12

Now I'm about half-way through an "update" that is reinstalling 225
packages.

You may be able to get away with just the list of packages that are dependencies of:

- dev-python/setuptools
- dev-python/gpep517

Since those are the build tools which most python packages use, which
means if you have a single 3.12 package, you'll need the build tools
installed for:

PYTHON_TARGETS: python3_12 python3_13


--
Eli Schwartz

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On 5/5/25 9:41 AM, Grant Edwards wrote:

I'm afraid I don't know what "::gentoo" refers to.

This is the usual way to refer to overlays/repositories in portage.

For example...

::gentoo is the official gentoo ebuild repository

::guru is the GURU project ( https://wiki.gentoo.org/wiki/Project:GURU )

::$N would map to a repository enabled via `eselect repository enable
$N` (as the general pattern for more obscure overlays).


-JayF

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On 5/6/25 11:06 AM, Grant Edwards wrote:

On 2025-05-05, Adam Carter <adamcarter3@gmail.com> wrote:

On Tue, May 6, 2025 at 12:12 AM Grant Edwards <grant.b.edwards@gmail.com> >> wrote:

How do I get a list of installed packages that are preventing
switching to Python 3.13.

Just one package blocking 3.13 for me
# emerge -pv --emptytree world | grep PYTHON_SINGLE | grep -v 'python3_13'

That dosn't quite work. On my machine that has 15 packages that are preventing switching to 3_13, the line above doesn't show any of them.
None of those packages have the PYTHON_SINGLE_TARGET flag. They all
use PYTHON_TARGETS.

I've tried this:

emerge -pv --emptytree world | grep PYTHON_TARGETS | grep -v '[ "]python_3_13 '

But that doesn't work either. emerge finds all sorts of cascading
problems and then gives up early.

Install "pkgcore".

Run:

pquery -I \
--has-use python_targets_python3_12 \
--has-use python_single_target_python3_12 \
--attr use | grep -v python3_13


It will list all *installed* packages with either "targets" or "single
target" that *do* support Python 3.12...

... but don't support Python 3.13


- They may have a fixed version available that you haven't yet
installed. If you've recently done a world update with --newuse
(--changed-use is not good enough) then it won't have any false
reports.

- They may have USE="-python", in which case it doesn't matter which
python versions the optional USE supports. If the USE flag is enabled,
you may be able to just disable it, too. e.g. boost, vim, file,
util-linux, pax-utils.



--
Eli Schwartz

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