Re: How to fix |mkfifo()| failure if |pathname| is on NFS ? / was: Re: [EXTERNAL] Re: mkfifo: cannot set permissions of 'x.fifo': Not a directory

[Martin Wege <martin.l.wege@gmail.com>]

On Sat, Aug 26, 2023 at 4:16 PM Corinna Vinschen via Cygwin
<cygwin@cygwin.com> wrote:
>
> On Aug 26 13:26, Cedric Blancher via Cygwin wrote:
> > On Fri, 25 Aug 2023 at 14:26, Corinna Vinschen via Cygwin
> > <cygwin@cygwin.com> wrote:
> > >
> > > On Aug 25 14:18, Corinna Vinschen via Cygwin wrote:
> > > > On Aug 23 01:05, Roland Mainz via Cygwin wrote:
> > > > > 2. Check whether the filesystem for the fifos path is NFS
> > > > > (cgywin.dll's |fs.fs_is_nfs()|), and then just refuse |mkfifo()| with
> > > > > |ENOSYS| (not implemented)
> > > >
> > > > I like the idea.
> > >
> > > EPERM, btw.  See https://man7.org/linux/man-pages/man2/mknod.2.html
> > >
> >
> > I am vehemently opposed to that idea. That will IMHO not only be the
> > wrong solution, it will break actual things like autoconf&friends on
> > NFS - they create fifos for testing, but do not use them. If you just
> > make this return EPERM, then you break stuff we have to rely on.
>
> https://cygwin.com/acronyms/#STC, please.#

Real world failure for Cygwin on NFS:

wget 'http://deb.debian.org/debian/pool/main/k/ksh93u+m/ksh93u+m_1.0.4.orig.tar.gz
cd ksh-1.0.4
$PWD/bin/package make

This fails with Cygwin 3.4.8-1:

cat buildlog.log
package: update
/cygdrive/z/arbeitdfn/windows_ksh/build_nfsv3/ksh-1.0.4/bin/execrate
package: initialize the
/cygdrive/z/arbeitdfn/windows_ksh/build_nfsv3/ksh-1.0.4/arch/cygwin.i386-64
view
package: update
/cygdrive/z/arbeitdfn/windows_ksh/build_nfsv3/ksh-1.0.4/arch/cygwin.i386-64/lib/probe/C/make/probe
package: update
/cygdrive/z/arbeitdfn/windows_ksh/build_nfsv3/ksh-1.0.4/arch/cygwin.i386-64/bin/mamake
package: make with mamake
package: make output captured in
/cygdrive/z/arbeitdfn/windows_ksh/build_nfsv3/ksh-1.0.4/arch/cygwin.i386-64/lib/package/gen/make.out
mkfifo: cannot set permissions of
'/cygdrive/z/arbeitdfn/windows_ksh/build_nfsv3/ksh-1.0.4/arch/cygwin.i386-64/lib/package/gen/make.out.fifo':
No such file or directory
package: make done at Fri Aug 26 19:24:26 CEST 2023 in
/cygdrive/z/arbeitdfn/windows_ksh/build_nfsv3/ksh-1.0.4/arch/cygwin.i386-64

If you need more examples just let me now, we have MUCH more of that...

Thanks,
Martin