On Thursday, January 10, 2019 at 9:58:56 AM UTC-6, E. Madison Bray wrote:
>
> > On archlinux that also uses system Python for Sage the
> > situation is better: importing sage.all in Python2 does work! Even
> > though the configuration constants are not in the environment! They
> > are set up properly in sage_env.py that is part of the SageMath
> > installation. And more precisely $SAGE_LOCAL fallsback to the default
> > "/usr" which is what it is intend to be on archlinux.
> >
> > I don't understand why on Debian $SAGE_LOCAL is set to None and
> > managed by environment variables.
>
> I have mentioned elsewhere (e.g. on
> https://trac.sagemath.org/ticket/22652) that the sage.env module ought
> to be fixed upstream (that is, in the main Sage sources) so that it
> can actually work properly without having to set any special
> environment variables. Even if it has to guess in some cases, and has
> to raise a RuntimeError if it can't reasonably guess the correct
> values for some variables, in most cases it should be possible to
> design this in such a way that it *just works* from a normal python
> interpreter with no additional variables set.
>
Fixing upstream is always best, but in the meantime is there some reason
that the Debian package doesn't just patch "sage/env.py" like Arch does?
Looking at the Arch approach, I checked that the following 3-line patch
causes 'python -c "import sage.all"' to succeed on Debian Sid with SageMath
8.4.
Best,
Nathan
--- env.py.orig 2019-01-03 05:15:59.000000000 -0600
+++ env.py 2019-01-10 12:28:13.000000000 -0600
@@ -118,10 +118,10 @@
_add_variable_or_fallback('LOCAL_IDENTIFIER','$HOSTNAME.%s'%os.getpid())
# bunch of sage directories and files
-_add_variable_or_fallback('SAGE_ROOT', None)
-_add_variable_or_fallback('SAGE_LOCAL', None)
+_add_variable_or_fallback('SAGE_ROOT', '/usr/share/sagemath')
+_add_variable_or_fallback('SAGE_LOCAL', '/usr')
_add_variable_or_fallback('SAGE_ETC', opj('$SAGE_LOCAL', 'etc'))
-_add_variable_or_fallback('SAGE_SCRIPTS_DIR',opj('$SAGE_LOCAL', 'bin'))
+_add_variable_or_fallback('SAGE_SCRIPTS_DIR',opj('$SAGE_ROOT', 'bin'))
_add_variable_or_fallback('SAGE_INC', opj('$SAGE_LOCAL', 'include'))
_add_variable_or_fallback('SAGE_SHARE', opj('$SAGE_LOCAL', 'share'))
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