hardwired paths in src/sage

[sagetrac-felixs]

Several run time paths in the python library are hardwired, in most cases to $SAGE_LOCAL.
$SAGE_LOCAL has no meaning outside of Sage (the distribution). So it's better to add them to sage-env.py and make them overridable.

For example in libs.singular.singular_init, the singular shared object is looked for in $SAGE_LOCAL/lib.

CC: @jondo @kiwifb @mkoeppe @dimpase @vbraun @kcrisman @miguelmarco @nbruin

Component: build

Keywords: environment, SAGE_LOCAL, hardwired, run time

Author: Felix Salfelder, Erik Bray, Matthias Koeppe

Branch: 45c5dd0

Reviewer: Jeroen Demeyer

Issue created by migration from https://trac.sagemath.org/ticket/15105

[sagetrac-felixs]

Commit: 2cffff8

[sagetrac-felixs]

Branch: u/felixs/runtime_paths

[sagetrac-felixs]

Dependencies: #15100

[sagetrac-felixs]

comment:2

Removed the ipython-sage-location check, as it involves $SAGE_LOCAL. Thus dependency on #15100.

[sagetrac-git]

Branch pushed to git repo; I updated commit sha1. New commits:

[changeset:c19a5f3]	unhardwire sandpile
[changeset:5746289]	unhardwire polymake path
[changeset:8f8a246]	get sage-started.txt from SAGE_ETC
[changeset:ee831c1]	unardwire sage-CSI call in csage
[changeset:16bf607]	initialize SAGE_ETC (from environ) in sage-location before use

[sagetrac-git]

Changed commit from 2cffff8 to c19a5f3

[sagetrac-git]

Changed commit from c19a5f3 to 591471d

[sagetrac-git]

Branch pushed to git repo; I updated commit sha1. New commits:

[changeset:591471d]

python-sage: whitelist python2.7 multiprocessing in stackframes test

[sagetrac-git]

Branch pushed to git repo; I updated commit sha1. New commits:

[changeset:0b9cb04]	doctests in src/sage/plot/misc.py
[changeset:1ef62a1]	unhardwire cython.py completed
[changeset:390e28b]	qepcard doctest fix: singular might well be in /usr/bin, not .../local/bin
[changeset:0dcd721]	unhardwire ELLCURVES_DATA_DIR

[sagetrac-git]

Changed commit from 591471d to 0b9cb04