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Subject: UNC path for WebDAV with cd '\\webdavsrv AT SSL\path' or cd
 '\\webdavsrv AT 23456\path' will not work
To: cygwin AT cygwin DOT com
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From: Martin Wege via Cygwin <cygwin AT cygwin DOT com>
Reply-To: Martin Wege <martin DOT l DOT wege AT gmail DOT com>
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On Thu, Feb 20, 2025 at 9:37 PM Corinna Vinschen via Cygwin
<cygwin AT cygwin DOT com> wrote:
>
> On Feb 20 19:24, Lionel Cons via Cygwin wrote:
> > On Thu, 20 Feb 2025 at 18:09, Corinna Vinschen via Cygwin
> > <cygwin AT cygwin DOT com> wrote:
> > >
> > > On Feb 20 17:37, Lionel Cons via Cygwin wrote:
> > > > On Thu, 20 Feb 2025 at 14:56, Cedric Blancher via Cygwin
> > > > <cygwin AT cygwin DOT 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!
> >
> > Sorry, it has been a very long day, and I did not communicate my point
> > precisely.
> > My point is that mkdir("//ember.data4.local") for a share should in my
> > opinion not return EROFS, because the share already exists.
> >
> > Looking at the code:
> > int
> > fhandler_base::mkdir (mode_t)
> > {
> >  if (exists ())
> >    set_errno (EEXIST);
> >  else
> >    set_errno (EROFS);
> >  return -1;
> > }
> >
> > My guess is that exists() fails. The why? and how? I do not know.
>
> And here's the problem.  It works fine for me on all shares, be it SMB,
> Samba, or NFS:
>
> https://cygwin.com/pipermail/cygwin/2025-February/257438.html
>
> > Maybe the hostname resolution in fhandler_netdrive::exists() failed?
>
> If so, it would be a problem on your side.
> Does `nslookup ember.data4.local' return a valid address?
>
> I just pushed a patch to print a debug statement in strace output
> to see what error code GetAddrInfoW returned.

The code in https://cygwin.com/git/?p=newlib-cygwin.git;a=commitdiff;h=df307349a09e6f1ba75c78b1427dcea40f435e6e;hp=8a8fb570d7c5310a03a34b3dd6f9f8bb35ee9f40
is not going to work, because you only give ret as argument, but not
"name+2" as hostname.

And speaking of the "hostname", is this the \\hostname\path of an UNC?
In that case this will not work with WebDAV/SSL or WebDAV with custom
port, which might be \\webdavserver AT SSL\path or
\\webdavserver AT 23456\path, or \\webdavserver AT SSL@23456\path
You need to replace the L'@' with L'\0' before calling GetAddrInfoW(),
or it is not going to work with WebDAV

The spec for that is in
https://learn.microsoft.com/en-us/windows/win32/api/davclnt/nf-davclnt-davgethttpfromuncpath

Thanks,
Martin

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