[Rd] R CMD INSTALL and file permission settings

Martin Maechler maechler at stat.math.ethz.ch
Mon Jun 10 11:44:57 CEST 2013

>>>>> Dirk Eddelbuettel <edd at debian.org>
>>>>>     on Sat, 8 Jun 2013 11:22:56 -0500 writes:

    > Summary:   

    > The directory /usr/local/lib/R/site-library can be used for site-wide
    > multi-user installations of R.  

    > This is even the default on Debian and Ubuntu (following a suggestion by
    > Kurt and Fritz a decade ago over beers -- what could be better).  However,
    > R enforces wrong permissions on directories and files there (removing
    > group-write) which effectively defeats this purpose, and breaks multiuser
    > installation:  if Tom, Dick and Harry are members of group 'r-users', each
    > one can install in the directory, but neither can _upgrade_ a package
    > installed by one of the others.  

    > I would like to correct this.

    > Details:   


    > Proposal:

    > Add a new option() [with a to-be-determined name] which, if enabled, turns
    > on group-write modes for files and directories, ie "664" and "775".  


    > I would be happy to write such a patch (including documentation updates) if
    > someone from R Core can signal willigness to look at it.



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