#12627: The sage-sage script engraves paths to executables
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Reporter: Snark | Owner: leif
Type: defect | Status: positive_review
Priority: major | Milestone: sage-5.0
Component: scripts | Keywords: rd2
Work_issues: | Upstream: N/A
Reviewer: R. Andrew Ohana | Author: Julien Puydt
Merged: | Dependencies:
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Comment(by leif):
Julien, I'm not sure whether you're aware of that, but your patch changes
in at least ''some'' situations the ''fully intentional'' behavior.
For example, a couple of Sage components / programs are ''optional'', like
e.g. `kash` or `Macaulay2`, and it is '''not''' intended to run a system-
wide / non-Sage version of `kash` (that might be found along `PATH`) if
one types `sage --kash`. (Although I admit that the current response in
case Sage's version ''isn't'' installed -- ''"File not found"'' -- is
quite odd, i.e., not very user-friendly.)
In other cases a path is prepended ''to make sure'' we really run the
correct instance of a Sage script, namely that of the ''"current"'' Sage
installation, given by `SAGE_ROOT` (or `SAGE_LOCAL`), or to make sure our
assumptions about the current directory (or other variable settings) are
correct -- especially since different people develop things, sometimes
perhaps too independently. Not very pythonic, but similar to `assert()`,
which at least ''signals'' errors [before things get worse and
untraceable].
Redundancy is ''necessary'' to achieve some robustness, catch (and
hopefully appropriately handle) errors when they occur, or as early as
possible, e.g. if a script or program doesn't exist where it is supposed
to be located, since we cannot rule out an installation gets messed up --
probably by Sage itself, due to bugs, if not by a user...
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/12627#comment:7>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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