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If we try to mmap a directory, we'll get ENODEV. This translates to "no such device" for the user, which is not very helpful. Since we've just fstat()'d the file, we can easily check whether the problem was a directory to give a better message. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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