/etc/init/mountall-reboot.conf is in mountall 2.54ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 | # mountall-reboot - Reboot after filesystems are changed
#
# If mountall exits to indicate a reboot is required, this does the
# necessary reboot.
description "Reboot after filesystems are changed"
start on stopped mountall EXIT_STATUS=4
task
exec reboot -f
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