From henrik.bengtsson at gmail.com  Thu Nov  9 01:55:38 2017
From: henrik.bengtsson at gmail.com (Henrik Bengtsson)
Date: Wed, 8 Nov 2017 16:55:38 -0800
Subject: [Rd] check does not check that package examples remove tempdir()
In-Reply-To: <CAF8bMcZfc7uibFXC7Gx=qjXr4J808rKupZjf6AUhTBeV_Vu1ig@mail.gmail.com>
References: <CAF8bMcZfc7uibFXC7Gx=qjXr4J808rKupZjf6AUhTBeV_Vu1ig@mail.gmail.com>
Message-ID: <CAFDcVCQt=+gZf-=j_bv2Zt5aNoyhT8WWOjSrLPu9GF97CqFC8w@mail.gmail.com>

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* tempdir(check = TRUE) recreates the tmpdir() if it is no longer
valid (e.g. because some other process has cleaned up the ?/tmp?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
>
>         [[alternative HTML version deleted]]
>
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[Rd] check does not check that package examples remove tempdir()
Henrik Bengtsson