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#!/bin/sh
MACHINE_ID="/etc/machine-id"
if mount | grep -q "${MACHINE_ID}"; then
id="$(cat "${MACHINE_ID}")" &&
umount "${MACHINE_ID}" &&
echo $id > "${MACHINE_ID}"
elif [ ! -s "${MACHINE_ID}" ]; then
id="$(uuidgen)" &&
echo ${id//-} > "${MACHINE_ID}"
fi &&
chmod 0444 "${MACHINE_ID}"
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