Re: master broken for default Ubuntu 20.04

[Jonas Hahnfeld]

Am Mittwoch, den 21.10.2020, 12:39 +0200 schrieb Jonas Hahnfeld via
Discussions on LilyPond development:
> Am Mittwoch, den 21.10.2020, 12:10 +0200 schrieb Thomas Morley:
> > Hi,
> > 
> > after recent system-upgrade to Ubuntu 20.04 'make' fails on current master 
> > with
> > 
> > [...]
> > Making lily/out/lilypond
> > Making lily/out/lilypond.1 (help2man)
> > Making mf/out/mf2pt1.mem < mp
> > Copying mf/out/00-lilypond-fonts.conf
> > Copying mf/out/99-lilypond-fonts.conf
> > Making mf/out/fonts.conf
> > Making mf/out/feta-noteheads11.pfb < mf
> > Making mf/out/feta11.pfb < mf
> > Making mf/out/feta-flags11.pfb < mf
> > /home/hermann/lilypond-git/mf/invoke-mf2pt1.sh: 25:
> > /home/hermann/lilypond-git/mf/invoke-mf2pt1.sh: 25: python: not
> > found/home/hermann/lilypond-git/mf/invoke-mf2pt1.sh: 25:
> > python: not found
> > python: not found
> > make[1]: *** [/home/hermann/lilypond-git/build/.././mf/GNUmakefile:37:
> > out/feta11.log] Error 127
> > make[1]: *** Waiting for unfinished jobs....
> > make[1]: *** [/home/hermann/lilypond-git/build/.././mf/GNUmakefile:37:
> > out/feta-noteheads11.log] Error 127
> > make[1]: *** [/home/hermann/lilypond-git/build/.././mf/GNUmakefile:37:
> > out/feta-flags11.log] Error 127
> > make: *** 
> > [/home/hermann/lilypond-git/build/../stepmake/stepmake/generic-targets.make:6:
> > all] Error 2
> > 
> > python: not found
> > really?
> > 
> > I then looked for 'python'
> > 
> > ~$ python
> > 
> > Command 'python' not found, did you mean:
> > 
> >   command 'python3' from deb python3
> >   command 'python' from deb python-is-python3
> > 
> > Just guessing, did Ubuntu 20.04 drop 'python' without a link to
> > 'python3'? Do we need to provide aliases python = python3 or the like?
> > Anyway, I then installed python-is-python3 and 'make' succeeded.
> > 
> > I don't understand why this is not the default on Ubuntu 20.04
> > Though, we should take care of it, imho.
> 
> See also this thread from May:
> https://lists.gnu.org/archive/html/lilypond-devel/2020-05/msg00245.html
> 
> My last message in there has a potential workaround for implementing
> realpath without Python.

See https://gitlab.com/lilypond/lilypond/-/issues/6059 and
https://gitlab.com/lilypond/lilypond/-/merge_requests/472

Cheers
Jonas

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