check does not check that package examples remove tempdir()

wrote:

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* tempdir(check = TRUE) recreates the tmpdir() if it is no longer
valid (e.g. because some other process has cleaned up the ?/tmp?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