/usr/bin/cgroupfs-umount is in cgroupfs-mount 1.1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 | #!/bin/sh
# Copyright 2011 Canonical, Inc
# 2014 Tianon Gravi
# Author: Serge Hallyn <serge.hallyn@canonical.com>
# Tianon Gravi <admwiggin@gmail.com>
set -e
# we don't care to move tasks around gratuitously - just umount the cgroups
# if we don't even have the directory we need, something else must be wrong
if [ ! -d /sys/fs/cgroup ]; then
exit 0
fi
# if /sys/fs/cgroup is not mounted, we don't bother
if ! mountpoint -q /sys/fs/cgroup; then
exit 0
fi
cd /sys/fs/cgroup
for sys in *; do
if mountpoint -q $sys; then
umount $sys
fi
if [ -d $sys ]; then
rmdir $sys || true
fi
done
exit 0
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