Re: strange mv behavior: mv <mydir> <mydir>

[Igor Pechtchanski <pechtcha at cs dot nyu dot edu>]

On Tue, 11 Feb 2003, linda w (cyg) wrote:

> I stumbled onto this trying to rename a dir from
> "Mydir" to "mydir" (w/o capital "M")
>
> > mv Mydir mydir
>         starts copying "Mydir" into Mydir/mydir.
>
> But it's not just the 'caps' that are the issue since:
>
> > mv mydir mydir
>         will start copying mydir into itself
>
>         On lnx, I get:
> mv: cannot move `mydir' to a subdirectory of itself, `mydir/mydir'
>
> Shouldn't I get a similar error on Windows?
>
>         Note to do the original, desired mv, I can use:
> > mv Mydir foo; mv foo mydir
>
>         Which (unfortunately), would be correct windows behavior since
> you can't rename a file or dir to a different name that varies only
> in capitalization (ignore case "feature").
>
> The problem is 'mv' isn't recognizing that source and target are
> the same name (even when case matches), so it is behaving like 'cp'.
>
> linda

Linda,

Note that 'mv' and 'cp' share code (copy.c) that does the actual
move/copy.  That file does have the message you refer to above,
conditional on errno==EINVAL after rename().  Apparently, Cygwin's (or,
rather, newlib's) rename doesn't have that behavior.  That's where I'd
start tracking it down.
	Igor
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