#10967: R breaks if SAGE_LOCAL undefined
--------------------------------------------------------------+-------------
Reporter: ahd | Owner:
tbd
Type: defect | Status:
new
Priority: minor | Milestone:
sage-duplicate/invalid/wontfix
Component: packages | Keywords:
R script SAGE_LOCAL R.sh.in spkg local/bin
Work_issues: Review as soon as #9668 is ready (new R spkg). | Upstream:
N/A
Reviewer: | Author:
Merged: | Dependencies:
#9668
--------------------------------------------------------------+-------------
Changes (by leif):
* keywords: R => R script SAGE_LOCAL R.sh.in spkg local/bin
* dependencies: => #9668
* work_issues: => Review as soon as #9668 is ready (new R spkg).
* milestone: sage-4.7.2 => sage-duplicate/invalid/wontfix
Comment:
Replying to [comment:17 leif]:
> ... although I think I wasn't expecting someone to run Sage's R from
"outside"...
''Thinking a bit more about this:'' ;-)
In general, ''none'' of the "stand-alone" programs like R, the PARI/GP
interpreter, Maxima etc. as shipped with and installed by Sage (and almost
none of the scripts) in `$SAGE_ROOT/local/bin/` are intended to be called
directly ''from outside the Sage environment'', hence there's also no
point in putting this directory into one's `PATH` (i.e., one shouldn't).
Instead, one can do any of the following:
* Start a Sage subshell (`sage --sh`), which then has the full Sage
environment set up, and also `$SAGE_ROOT/local/bin/` in its `PATH`, such
that running e.g. (Sage's) R by typing simply `R` at the command prompt
works.
* Run (e.g.) `sage --R` from any shell to start Sage's R (assuming an
instance of `$SAGE_ROOT/sage` is found along one's "global" `PATH`;
otherwise `/path/to/SAGE_ROOT/sage --R` or `cd $SAGE_ROOT && ./sage --R`).
* Use the `install_scripts()` function from the `sage:` prompt to create
light-weight "shortcut" scripts for all "stand-alone" components
(programs) installed by Sage, or one can run it by for example
{{{
#!sh
$ ./sage -c "install_scripts('$HOME/bin')"
}}}
or
{{{
#!sh
$ sudo ./sage -c "install_scripts('/usr/local/bin')" # needs root
privileges
}}}
Afterwards, provided that both an instance of `$SAGE_ROOT/sage` is found
along and the directory passed to `install_scripts()` is contained in
`PATH`, one can start (e.g.) Sage's R again by simply typing `R` from any
shell, i.e., ''also from "outside the Sage environment"''. [[BR]]
''Note: `install_scripts()` currently has a flaw in that the created
shortcuts do not support spaces in arguments passed to them; this has been
fixed at #11602, which has been merged into Sage 4.7.2.alpha2.''
[[BR]]
Nonetheless, I agree that we should at least add a sanity check to e.g.
`$SAGE_ROOT/local/bin/R`, such that it exits with an appropriate error
message in case `SAGE_LOCAL` isn't defined (like many scripts already do).
I guess such a test is currently missing just because nobody thought of
someone trying to call this (and some other scripts) directly, since
having them in the `PATH` without a properly set up environment was never
intended.
I can (and will perhaps) also make ''some'' scripts automatically execute
themselves in a Sage environment, since this (to me) seems convenient for
e.g. `devel/sage/spkg-dist`, but most probably not scripts like `R` in
`$SAGE_ROOT/local/bin/`, because of the alternatives already present as
given above.
----
I'll address the specific issue with the R script(s) at #9668 (''not''
#9968 ;-) ), so I've added that ticket as a dependency.
After I've fixed this there (by simply adding a sanity check), this ticket
should IMHO be closed as duplicate (not to say ''"invalid/won't fix"'').
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/10967#comment:18>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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