[R] file.access returning -1 for a file on remote Windows drive.

[Jim Lemon]

Hi Sam,
Just a guess, but your "*.R" files should be text, not binary. Windows
doesn't distinguish between the two locally if I remember correctly,
but may have to when accessing things outside the Windowsphere.

Jim

On Sat, Feb 29, 2020 at 9:07 AM Sam Albers <tonightsthenight using gmail.com> wrote:
>
> Some additional follow-up:
>
> > summary(file(remote_file, "rb"))$`can read`
> [1] "yes"
>
> > summary(file(local_file, "rb"))$`can read`
> [1] "yes"
>
> compared to:
>
> > file.access(local_file, 4)
> local.R
>          0
>
> > file.access(remote_file, 4)
> remote.R
>             -1
>
> Can anyone think why file.access and file would be contradicting each other?
>
> Sam
>
> On Fri, Feb 28, 2020 at 10:47 AM Sam Albers <tonightsthenight using gmail.com> wrote:
> >
> > Hi there,
> >
> > Looking for some help in diagnosing or developing a work around to a
> > problem I am having on a Windows machine. I am running R 3.6.2.
> >
> > I have two identical files, one stored locally and the other stored on
> > a network drive.
> >
> > For access:
> >
> > > file.access(local_file, 4)
> > local.R
> >          0
> >
> > > file.access(remote_file, 4)
> > remote.R
> >             -1
> >
> > Also for file.info
> >
> > > file.info(local_file)$mode:
> > [1] "666"
> >
> > > file.info(remote_file)$mode:
> > [1] "666"
> >
> > Ok so I am access issues. Maybe they are ephemeral and I can change
> > the permissions:
> >
> > > Sys.chmod('remote.R', mode = '666')
> > > file.access(remote_file, 4)
> > remote.R
> >             -1
> >
> > Nope. I am thoroughly stumped and maybe can't make it any further
> > because of Windows.
> >
> > Downstream I am trying to use digest::digest to create a hash but
> > digest thinks we don't have permission because file.access is failing.
> > Any thoughts on how I can get file.access to return 0 for the remote.R
> > file? Any ideas?
> >
> > Thanks in advance,
> >
> > Sam
>
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