[Bug 210256] mv may delete files on case-preserving but case-insensitive filesystems

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=210256

            Bug ID: 210256
           Summary: mv may delete files on case-preserving but
                    case-insensitive filesystems
           Product: Base System
           Version: 10.1-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: alexander.klein at physiologie.med.uni-giessen.de

When renaming files on a filesystem that's both, case-preserving and
case-insensitive, the file may in fact be deleted when only the case of a few
letters is changed; see the example below for what happens on a SAMBA-share.

% touch abc    

% ls -l abc Abc
-rw-rw-rw-  1 nobody  nobody  0 13 Jun 17:04 Abc
-rw-rw-rw-  1 nobody  nobody  0 13 Jun 17:04 abc

% mv abc Abc

mv: rename abc to Abc: No such file or directory

% ls -l abc Abc
ls: Abc: No such file or directory
ls: abc: No such file or directory

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