[regression-3.6] coreutils mkdir broken on UNC paths

Thu Feb 20 17:02:55 GMT 2025

On Feb 20 17:37, Lionel Cons via Cygwin wrote:
> On 2025年2月20日 at 14:56, Cedric Blancher via Cygwin
> <cygwin@cygwin.com> wrote:
> >
> > Good afternoon!
> >
> > Cygwin 3.6.0-0.378.g78fb13d21f4f.x86_64, Cygwin coreutils package 9.6-1
> >
> > coreutils mkdir is broken on UNC paths:
> >
> > mkdir -p -- "//ember.data4.local/afs/disk11/builds/bash/install_root/usr/local/bin"
> > mkdir: cannot create directory ‘//ember.data4.local’: Read-only file system
> >
> > This happens because you cannot do a "cd .." in
> > //ember.data4.local/afs, because "afs" is the UNC prefix for that
> > filesystem.
>> No, it happens because mkdir "//ember.data4.local" returns "Read-only
> file system". If Cygwin would just return EEXIST if this mount exists,
> then this whole mkdir -p would work.

You know exactly what Cygwin is doing wrong, great! I'm looking
forward to your git-formatted patch on cygwin-patches. I'm already
pretty curious of the actual cause of the problem.
Corinna