#20655: R installation failing on Cygwin
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Reporter: embray | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-7.3
Component: porting: Cygwin | Resolution:
Keywords: windows cygwin R | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
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Comment (by embray):
Okay, I think this is a bug in R IMO.
R installs a bunch of "scripts" particular to R with names like `BUILD`
and `INSTALL`. R's install mistakenly marks these "scripts" as executable
even though they do not contain a shebang line, so they are technically
not executable in that sense. Instead it runs those scripts from a main
script (called `Rcmd`) using `exec`.
The problem here is that `Rcmd` only run these R-specific scripts ''if''
they are executable, and exist in `$R_HOME/bin`. Realistically just
whether they exist and are files in `$R_HOME/bin` should be good enough,
since there shouldn't be any non-executable files in there. If nothing
else it should try to exec and if that fails it will return a permission
error. On Cygwin `exec` doesn't care if the file is marked executable or
not, for this reason. It will just try to execute it.
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Ticket URL: <http://trac.sagemath.org/ticket/20655#comment:2>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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