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Date: Tue, 3 Feb 2026 13:20:11 +0100
To: cygwin AT cygwin DOT com
Subject: Re: git fsck complains about error:
 refs/tags/.cyg000000000559e25517156b51cf219f51/libgcj-2.95.0: badRefName:
 invalid refname format?!
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From: Corinna Vinschen via Cygwin <cygwin AT cygwin DOT com>
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On Feb  3 00:55, Dan Shelton via Cygwin wrote:
> On Mon, 2 Feb 2026 at 17:04, Corinna Vinschen via Cygwin
> <cygwin AT cygwin DOT com> wrote:
> >
> > On Feb  2 14:47, Dan Shelton via Cygwin wrote:
> > > On Mon, 2 Feb 2026 at 14:40, Corinna Vinschen via Cygwin
> > > <cygwin AT cygwin DOT com> wrote:
> > > >
> > > > On Feb  2 13:24, Dan Shelton via Cygwin wrote:
> > > > > I'm not sure whether the Cygwin code is correct. I did a peek with a
> > > > > kernel debugger, and I see that FILE_RENAME_INFORMATION.RootDirectory
> > > > > is always NULL if a file gets renamed to .cyg000000000xxxx. But if I
> > > > > try that with NTFS or SMB, the NtSetInformationFile() to set
> > > > > FileRenameInformation always fails.
> > > >
> > > > Your testcase is incorrect, unfortunately.
> > > >
> > > > >     fri->FileNameLength = (wcslen(dstfile)+1)*sizeof(wchar_t);
> > > >
> > > > For NT file paths, never count the trailing \0 to the length:
> > > >
> > > >       fri->FileNameLength = wcslen(dstfile) * sizeof (WCHAR);
> > > >
> > > > With that, your testcase works fine for me.
> > > >
> > > > On which filesystem did you see the problem?
> > >
> > > Windows NFSv3 client (the builtin one, not the newer NFSv4.1 one).
> >
> > The files in question are actually files which got renamed while
> > in use.  I don't know another way to implement removing in-use files
> > on remote file systems not supporting delete POSIX semantics.  If
> > somebody has a brilliant idea, https://cygwin.com/acronyms/#PTC.
> 
> Did you see that these are directories, not files? How does that happen?

Yes, I saw that.  Same as for files.  Basically something like this:

  mkdir ("dir");
  fd = open ("dir", O_DIRECTORY);
  unlink ("dir");
  fd2 = openat (fd, "file", O_CREAT...);


Corinna

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