Hi Jakub,
this looks like a Fedora packaging problem.
Please report it to them.
Dima
On Fri, 9 Sep 2022, 23:12 Jakub Sliacan, <jakub.slia...@gmail.com> wrote:
> Hi!
>
> I'm using sage 9.6 on Fedora 36, installed via dnf. I am seeing the
> following. The version of nauty package that I see installed is
> nauty-2.7.4-1.fc36.x86_64.
>
> ```
> sage: for t in digraphs.tournaments_nauty(6):
> ....: print(t)
> ....:
> ---------------------------------------------------------------------------
> FeatureNotPresentError Traceback (most recent call last)
> Input In [1], in <cell line: 1>()
> ----> 1 for t in digraphs.tournaments_nauty(Integer(6)):
> 2 print(t)
>
> File
> /usr/lib64/python3.10/site-packages/sage/graphs/digraph_generators.py:532,
> in DiGraphGenerators.tournaments_nauty(self, n, min_out_degree,
> max_out_degree, strongly_connected, debug, options)
> 530 import shlex
> 531 from sage.features.nauty import NautyExecutable
> --> 532 gentourng_path = NautyExecutable("gentourng").absolute_filename()
> 534 sp = subprocess.Popen(shlex.quote(gentourng_path) + "
> {0}".format(nauty_input),
> 535 shell=True,
> 536 stdin=subprocess.PIPE,
> stdout=subprocess.PIPE,
> 537 stderr=subprocess.PIPE, close_fds=True)
> 539 if debug:
>
> File /usr/lib64/python3.10/site-packages/sage/features/__init__.py:619, in
> Executable.absolute_filename(self)
> 617 if path is not None:
> 618 return path
> --> 619 raise FeatureNotPresentError(self,
> 620 reason="Executable {executable!r} not
> found on PATH.".format(executable=self.executable),
> 621 resolution=self.resolution())
>
> FeatureNotPresentError: nauty_gentourng is not available.
> Executable 'gentourng' not found on PATH.
> No equivalent system packages for pip are known to Sage.
> ```
> It seems like no generators based on nauty are available, as I get the
> same error with `geng` if I want to access items from
> `graphs.nauty_geng("2")`.
>
> If I recall correctly, there were no additional (installation) steps
> needed for these things to work in e.g. Sage 8.3. And I can't find any
> notes about this afterwards. Any help is much appreciated!
>
> Thanks in advance,
> Jakub
>
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