Re: [RFC] git worktree: use filesystem cloning where supported

["brian m. carlson" <sandals@crustytoothpaste.net>]

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On 2026-08-14 at 13:29:26, Peter Morris wrote:
> The PR says it only supports Linux and macOS, but ReFS
> is available on Windows too.
> 
> I believe that if the source and destination are on the same ReFS
> volume the Windows CopyFile API will use block cloning automatically,
> so if CopyFile were used we would get this for free on Windows Dev
> Drives.

ReFS has serious defects in its implementation.  If the data has been
written but not flushed to disk, the resulting copy will be corrupt.  I
just saw this come in with Git LFS[0] and I described it to a colleague
as "horribly broken".  I definitely don't recommend adding support for
this to Git until only fixed versions of Windows are publicly available.

[0] https://github.com/git-lfs/git-lfs/issues/6312
-- 
brian m. carlson (they/them)
Toronto, Ontario, CA

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