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#!/bin/sh -e
for line in $(systemctl show -p SystemState,NFailedUnits); do
split_idx="$(printf "%s" "$line" | awk '{print index($0, "=")}')"
property="$(printf "%s" "$line" | awk '{print substr($0, 1, '"$split_idx"' - 1)}')"
value="$(printf "%s" "$line" | awk '{print substr($0, '"$split_idx"' + 1)}')"
case "$property" in
"SystemState")
SYSTEM_STATE="$value"
;;
"NFailedUnits")
FAILED_UNITS="$value"
;;
*)
;;
esac
done
if [ -z "$SYSTEM_STATE" ] || [ -z "$FAILED_UNITS" ]; then
echo "$0: failed to get expected data from system." >&2
exit 3
fi
printf "SYSTEM %s: %d units failed.\n" "$SYSTEM_STATE" "$FAILED_UNITS"
if [ "0" = "$FAILED_UNITS" ]; then
exit 0
else
printf "\nFailed units:\n"
systemctl list-units --failed --plain --no-legend \
| awk '{print "- " $1;}'
exit 2
fi
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