B20: mv deletes files on error (NT)

[Corinna Vinschen]

Anders Norlander wrote:
> 
> `mv foo Foo' is a perfectly legal command, case-sensitive file-system or
> not.

Imagine, what `mv' does in this case (shortened):

	stat('foo', &st_from);
	stat('Foo', &st_to);
	if (st_from.st_ino == st_to.st_ino)
	  {
	    // Oops, it's already the same file
	  }

and this is exactly the situation for `mv' under windows! It's not
a bug of cygwin dll, because the two stat calls really return stat
structures of the same file! This is correct for case preserving FS.
It's the problem of the 'mv' implementation, to handle this situation
not right.

Regards,
Corinna

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