unpack-trees: handle lstat failure for existing directory
When check_leading_path notices no file in the way of the new entry to be checked out, verify_absent checks whether there is a directory there or nothing at all. If that lstat call fails (for example due to ENOMEM), it assumes ENOENT, meaning a directory with untracked files would be clobbered in that case. Check errno after calling lstat, and for conditions other than ENOENT, just error out. This is a theoretical race condition. lstat has to succeed moments before it fails for there to be trouble. Signed-off-by: NJonathan Nieder <jrnieder@gmail.com> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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