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Date: Thu, 20 Feb 2025 18:02:55 +0100
To: cygwin@cygwin.com
Subject: Re: [regression-3.6] coreutils mkdir broken on UNC paths
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From: Corinna Vinschen via Cygwin <cygwin@cygwin.com>
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Cc: Corinna Vinschen <corinna-cygwin@cygwin.com>
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On Feb 20 17:37, Lionel Cons via Cygwin wrote:
> On Thu, 20 Feb 2025 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

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