[R-pkg-devel] creating indelible file during unit test

[Tom Wainwright]

In *nix systems, permission to delete is at the directory level, not the
file level, so you might try changing the mode of the parent directory,
rather than the file itself, as in:

> dir.create('test')
> > file.create(file.path("test",'file1'))
> [1] TRUE
> > Sys.chmod("test", mode="0000")
> > file.remove(file.path("test",'file1'))
> [1] FALSE
> Warning message:
> In file.remove(file.path("test", "file1")) :
>   cannot remove file 'test/file1', reason 'Permission denied'
> > Sys.chmod("test", mode="0777")
> > file.remove(file.path("test",'file1'))
> [1] TRUE
> >
>

Not sure if this will work in Windows, though.

Regards,
  Tom Wainwright

On Tue, Dec 12, 2017 at 4:24 AM, Thierry Onkelinx <thierry.onkelinx at inbo.be>
wrote:

> Dear all,
>
> Some function I wrote deletes a bunch of files. It is crucial that all
> files get deleted. Hence it should return an error when one or more
> files couldn't be deleted.
>
> I'm writing a unit test for this function. I fail to create a file
> that can't be deleted by the function. I've tried Sys.chmod(file,
> "000") which didn't work.
>
> Any suggestions?
>
> Best regards,
>
> ir. Thierry Onkelinx
> Statisticus / Statistician
>
> Vlaamse Overheid / Government of Flanders
> INSTITUUT VOOR NATUUR- EN BOSONDERZOEK / RESEARCH INSTITUTE FOR NATURE
> AND FOREST
> Team Biometrie & Kwaliteitszorg / Team Biometrics & Quality Assurance
> thierry.onkelinx at inbo.be
> Kliniekstraat 25, B-1070 Brussel
> www.inbo.be
>
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