On 02/05/2018 09:32 AM, Guido Aulisi wrote:
Hi,
according to latest python guides, we should avoid calling generic
unversioned python command
(https://fedoraproject.org/wiki/Changes/Avoid_usr_bin_python_in_RPM_Build#Quick_Opt-Out)
But what should we do if it's called inside waf? waf is provided
upstream, should we patch it to call either python2 or python3, or use
PYTHON_DISALLOW_AMBIGUOUS_VERSION=0?
I got this problem in recent ardour5 rawhide builds
(https://apps.fedoraproject.org/koschei/package/ardour5?collection=f28).
Now I'm seeing that builds are back to normal and python2 has been downgraded.
Thanks
Thanks for the question, and sorry for the inconvenience!
The python2 message is, so far, only a warning. I see the log contains a
different error: "--freedesktop requires itstool > 2.0.0 to translate
files.".
Could you check if that's not causing the failure?
If the python2 message is breaking your build, then please file a bug
and set an environment variable, as described in the Change. (Do file
the bug, though – that ensures we'll contact you before we remove the
workaround.)
Background:
We do want everyone to avoid calling /usr/bin/python, but we realize
it's not always easy. That's why we added the warning -- it will allow
us to grep the logs to figure out what is using it (and why). And of
course, in simple cases it can be fixed right away.
Some tools do fail if there's extra output on stderr; that's the reason
for the "Quick Opt-Out" workaround.
It looks like waf will be one of the tougher things to figure out. After
the mass rebuild we'll see the effect on the whole distribution, and
hopefully come up with a better strategy for bundled waf.
--
Petr Viktorin
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