NFS mkfifo support in cygwin 3.5.0 Re: [ANNOUNCEMENT] cygwin 3.4.9-1

[Cedric Blancher]

On Thu, 7 Sept 2023 at 23:20, Martin Wege via Cygwin <cygwin@cygwin.com> wrote:
>
> On Wed, Sep 6, 2023 at 5:27 PM Corinna Vinschen via Cygwin-announce
> via Cygwin <cygwin@cygwin.com> wrote:
> >
> > The following packages have been uploaded to the Cygwin distribution:
> >
> > * cygwin-3.4.9-1
> > * cygwin-devel-3.4.9-1
> > * cygwin-doc-3.4.9-1
> >
> > Bug Fixes
> > ---------
> >
> > - Fix a bug introduced in cygwin 3.4.0 that switch_to_nat_pipe flag is
> >   not cleared properly when non-cygwin app is terminated in the case
> >   where pseudo console is not activated.
> >
> > - For the time being, disable creating special files using mknod/mkfifo
> >   on NFS.
> >   Addresses: https://cygwin.com/pipermail/cygwin/2023-August/254266.html
>
> While I am unhappy that you disabled this for Cygwin 3.4.9-1, we
> noticed that you added mkfifo support for Cygwin 3.5.0 in
> https://cygwin.com/git/?p=newlib-cygwin.git;a=commit;h=622fb0776ea333dd708ff312f08ec98311138fbe
> 🙏😁 :-)
>
> Thanks
>
> We are testing 3.5.0-0.423.g7ced682549ae.x86_64 - which includes
> 622fb0776ea333dd708ff312f08ec98311138fbe - right now, feedback will
> come on Monday

That's amazing news.

But an old bug crept in:
H is NFS file system
$ uname -a
CYGWIN_NT-10.0-19045 bastille0x44ef 3.5.0-0.423.g7ced682549ae.x86_64
2023-09-07 17:19 UTC x86_64 Cygwin
$ mount
C:/cygwin64/bin on /usr/bin type ntfs (binary,auto)
C:/cygwin64/lib on /usr/lib type ntfs (binary,auto)
C:/cygwin64 on / type ntfs (binary,auto)
C: on /cygdrive/c type ntfs (binary,posix=0,user,noumount,auto)
H: on /cygdrive/h type nfs (binary,posix=0,user,noumount,auto)
M: on /cygdrive/m type nfs (binary,posix=0,user,noumount,auto)
N: on /cygdrive/n type nfs (binary,posix=0,user,noumount,auto)
O: on /cygdrive/o type nfs (binary,posix=0,user,noumount,auto)
P: on /cygdrive/p type nfs (binary,posix=0,user,noumount,auto)
$ cd /cygdrive/h/tmp/
$ mkfifo f1.fifo ; echo $?
0
$ mkfifo -m 0600 f2.fifo ; echo $?
mkfifo: cannot set permissions of 'f2.fifo': No such file or directory
1

So chmod() for a FIFO inode on NFS fails. Tested with MSFT NFSv3 and
new builds of the NFSv4.1 ms-nfs41-client filesystems.

Ced
-- 
Cedric Blancher <cedric.blancher@gmail.com>
[https://plus.google.com/u/0/+CedricBlancher/]
Institute Pasteur