mv: fix the remaining TOCTOU#12170
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cakebaker
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May 8, 2026
uutils#10010) EXDEV fallback now catches AlreadyExists and replaces the destination via temp-name + fs::rename. Matches GNU mv.
Add fsxattr::copy_xattrs_fd; mv's EXDEV fallback opens src/dst with O_NOFOLLOW via safe_copy and copies content + xattrs on the live fds, pinning both inodes against a concurrent renamer.
Restore strict ENOTSUP/EOPNOTSUPP propagation on copy_xattrs and copy_xattrs_fd; add copy_xattrs_ignore_unsupported and copy_xattrs_fd_ignore_unsupported wrappers for best-effort callers. mv uses the wrappers; cp --preserve=xattr exits 1 on ENOTSUP again.
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