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Date:	Mon, 21 Aug 2023 10:37:53 +0200
To:	cygwin AT cygwin DOT com
Subject:	Re: mkfifo: cannot set permissions of 'x.fifo': Not a directory
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From:	Corinna Vinschen via Cygwin <cygwin AT cygwin DOT com>
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On Aug 21 06:49, Cedric Blancher via Cygwin wrote:
> On Fri, 18 Aug 2023 at 10:35, Corinna Vinschen via Cygwin
> <cygwin AT cygwin DOT com> wrote:
> >
> > On Aug 18 06:02, Martin Wege via Cygwin wrote:
> > > On Mon, Aug 7, 2023 at 4:42 PM Martin Wege <martin DOT l DOT wege AT gmail DOT com> wrote:
> > > >
> > > > Hello,
> > > >
> > > > We get a weird mkfifo failure in Cygwin on NTFS:
> > > >
> > > > /usr/bin/mkfifo -m 600 x.fifo
> > > > mkfifo: cannot set permissions of 'x.fifo': Not a directory
> > > >
> > > > Is there a known workaround? So far named fifos cannot be created somehow.
> > >
> > > This is fixed for NTFS, but still broken for Windows builtin NFS v3 client:
> >
> > It was actually never supposed to work on NFS.
> 
> Are you sure? AT&T AST and ARB (rDNA data cruncher) certainly have
> worked with Cygwin on NFS shares (Windows builtin, I think you call it
> MSFT NFSv3) in the past in our institute.
> 
> Tested with Cygwin 3.4.8: AST is not even building without such
> support, and ARB throws nasty errors in the cluster run setup phase
> II, because it cannot create the command fifo used for each cluster
> node.
> 
> >
> > Cygwin FIFOs are
> > created as symlinks of the type Windows shortcut with the R/O attribute
> > set.  Those are only generated on NTFS and FAT filesystems.  NFS symlinks
> > are generated using special magic.  NFS doesn't support DOS attributes.
> 
> So no Linux mkfifo support on NFS with Cygwin?

You're talking about Linux FIFOs, which don't make *any* sense on
Cygwin, and I'm talking about Cygwin FIFOs which don't make *any* sense
on Linux or, FWIW, a remote NFS fileystem.

So if you want Cygwin to be able to create FIFOs on a remote NFS, which
Cygwin won't be able to use, great.  I don't see any sense in that, but,
as usual, https://cygwin.com/acronyms/#PTC


Corinna

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