On Fri, 26 Jun 2009, Tony Plate wrote:
I find that Sys.glob() doesn't like UNC paths where the initial slashes are
backslashes. The help page for Sys.glob() doesn't specificly mention UNC
paths, but does say: "File paths in Windows are interpreted with separator \
or /." Is the failure to treat a path beginning with a double-backslash as a
UNC network drive path the intended behavior?
Yes. There are general warnings about non-POSIX Windows paths in
several of the help files.
The following comments should alert you to possible restrictions:
The \code{glob} system call is not part of Windows, and we supply an
emulation.
File paths in Windows are interpreted with separator \code{\\} or
\code{/}. Paths with a drive but relative (such as \code{c:foo\\bar})
are tricky, but an attempt is made to handle them correctly.
If you want to submit a well-tested patch, it will be considered.
E.g., on a Windows system where \\foo is a network drive and \\foo\bar
exists, I see:
Sys.glob("//foo/bar")
[1] "//foo/bar"
Sys.glob("//foo\\bar")
[1] "//foo\\bar"
Sys.glob("\\\\foo/bar")
character(0)
Sys.glob("\\\\foo\\bar")
(the pattern of behavior seems to be that initial backslashes are not
equivalent to forward slashes, but later backslashes are.)
This is not a big deal, but I noticed it because it results in Rcmd check
giving a spurious warning when started from a cygwin shell with a working
directory that is a network drive specified as a UNC path. This happens
because mandir in tools:::.writePkgIndices has the form
\\foo/bar/R/packages/mypkg/man, which results in the false warning "there is
a 'man' dir but no help pages in this package." A simple workaround was to
use a drive-letter mount for the network drive.
sessionInfo()
R version 2.9.1 (2009-06-26) i386-pc-mingw32
locale:
LC_COLLATE=English_United States.1252;LC_CTYPE=English_United
States.1252;LC_MONETARY=English_United
States.1252;LC_NUMERIC=C;LC_TIME=English_United States.1252
attached base packages:
[1] stats graphics grDevices utils datasets methods base
-- Tony Plate
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--
Brian D. Ripley, rip...@stats.ox.ac.uk
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
University of Oxford, Tel: +44 1865 272861 (self)
1 South Parks Road, +44 1865 272866 (PA)
Oxford OX1 3TG, UK Fax: +44 1865 272595
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