cross platform - Read system TMP dir in R -


what cross-platform method find os temporary directory within r? use:

dirname(tempdir())

which did job both on ubuntu , windows within interactive r session. however, failed when called inside rapache. in rapache value of tempdir() /tmp, dirname(tempdir()) results in /, wrong. tried:

sys.getenv("tmp") sys.getenv("temp") sys.getenv("tmpdir")

as suggested ?"environment variables" none of these set in ubuntu. doesn't seem set in of files in /etc/r/* don't quite understand how r detects value.

the environment variables "tmpdir", "tmp", , "temp" can used modify value returned tempdir() if c variable r_tempdir isn't set (although i'm not sure how done). if want cross-platform function return path of reasonable tmp directory, , aren't interested in value of r_tempdir, use this:

gettmpdir <- function() {   tm <- sys.getenv(c('tmpdir', 'tmp', 'temp'))   d <- which(file.info(tm)$isdir & file.access(tm, 2) == 0)   if (length(d) > 0)     tm[[d[1]]]   else if (.platform$os.type == 'windows')     sys.getenv('r_user')   else     '/tmp' }

this based on function inittempdir in file src/main/sysutils.c r source distribution, translated c r.


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