diskimage-builder/diskimage_builder/elements/centos/pre-install.d/02-set-machine-id

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#!/bin/bash
if [ ${DIB_DEBUG_TRACE:-0} -gt 0 ]; then
set -x
fi
set -eu
set -o pipefail
# Set a machine-id. The .qcow2 image doesn't have one, and sometimes
# one will get made (if systemd is upgraded as part of the build
# process) and sometimes not. The problem is that certain kernel
# install scripts bail silently without it; kernel packages end up
# being installed but the initramfs etc isn't copied into place.
#
# Note this is cleared out in the sysprep role.
#
# See also:
# 768c5e188c1b4bff01da14a49b96b51301db4c03 : similar thing for fedora
# https://bugzilla.redhat.com/show_bug.cgi?id=1737355 : upstream bug
# https://bugzilla.redhat.com/show_bug.cgi?id=1486124 : unresolved
# bug about kernel install requiring machine-id
systemd-machine-id-setup