#9507: if spkg-install is a Python script, first check that
SAGE_LOCAL/bin/python
exists.
---------------------------+------------------------------------------------
Reporter: was | Owner: GeorgSWeber
Type: enhancement | Status: new
Priority: major | Milestone: sage-4.5.1
Component: build | Keywords:
Author: | Upstream: N/A
Reviewer: | Merged:
Work_issues: |
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Comment(by drkirkby):
How do you check if Python exists in a Python script? I would have thought
the code to check Python exists would have relied on Python existing - a
catch 22. Of course, if you happen to have a system wide Python, then you
could use that to check for $SAGE_LOCAL/bin/python. But that's going to be
far from reliable, since:
* A system may have no Python
* A system Python may be too old.
* A system Python may not work properly, which is what appears to have
happened in your sage_fortran setup.
But I guess it is more reliable than no test at all, but I can't think of
a 100% sure-fire way of doing this. One could make all spkg-install's
/bin/sh scripts, and use that to check for Python before calling a Python
script. But that's a lot of messing around, and one probably more likely
to introduce a bug than detect one.
Dave
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/9507#comment:1>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
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