[Rd] check does not check that package examples remove tempdir()

[Henrik Bengtsson]

Related to this problem - from R-devel NEWS
(https://cran.r-project.org/doc/manuals/r-devel/NEWS.html):

* tempdir(check = TRUE) recreates the tmpdir() if it is no longer
valid (e.g. because some other process has cleaned up the ‘/tmp’
directory).

Not sure if there's a plan to make check = TRUE the default though.

/Henrik

On Wed, Nov 8, 2017 at 4:43 PM, William Dunlap via R-devel
<r-devel at r-project.org> wrote:
> I was looking at the CRAN package 'bfork-0.1.2', which exposes the Unix
> fork() and waitpid() calls at the R code level, and noticed that the help
> file example for bfork::fork removes R's temporary directory, the value of
> tempdir().   I think it happens because the forked process shares the value
> of tempdir() with the parent process and removes it when it exits.
>
> This seems like a serious problem - should 'check' make sure that running
> code in a package's examples, vignettes, etc. leaves tempdir() intact?
>
>> dir.exists(tempdir())
> [1] TRUE
>> library(bfork)
>> example(fork)
>
> fork>     ## create a function to be run as a separate process
> fork>     fn <- function() {
> fork+         Sys.sleep(4)
> fork+         print("World!")
> fork+     }
>
> fork>     ## fork the process
> fork>     pid <- fork(fn)
>
> fork>     ## do work in the parent process
> fork>     print("Hello")
> [1] "Hello"
>
> fork>     ## wait for the child process
> fork>     waitpid(pid)
> [1] "World!"
> [1] 7063
>> dir.exists(tempdir())
> [1] FALSE
>
>
> Bill Dunlap
> TIBCO Software
> wdunlap tibco.com
>
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