/etc/init/checkroot.sh.conf is in mountall 2.53.
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 | # checkfs.sh - compatibility job for sysvinit dependencies
#
# This job runs once the root filesystem is mounted, to signal startpar
# that other rcS jobs relying on the historic checkroot.sh
# interface can continue.
description "Signal sysvinit that the rootfs is mounted"
start on mounted MOUNTPOINT=/
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