#!@SBINDIR@/openrc-run
# Copyright (c) 2007-2015 The OpenRC Authors.
# See the Authors file at the top-level directory of this distribution and
# https://github.com/OpenRC/openrc/blob/HEAD/AUTHORS
#
# This file is part of OpenRC. It is subject to the license terms in
# the LICENSE file found in the top-level directory of this
# distribution and at https://github.com/OpenRC/openrc/blob/HEAD/LICENSE
# This file may not be copied, modified, propagated, or distributed
# except according to the terms contained in the LICENSE file.

description="Mount the sys filesystem."

sysfs_opts=nodev,noexec,nosuid

depend()
{
	keyword -docker -podman -lxc -prefix -systemd-nspawn -vserver -wsl
}

mount_sys()
{
	grep -Eq "[[:space:]]+sysfs$" /proc/filesystems || return 1
	mountinfo -q /sys && return 0

	if [ ! -d /sys ]; then
		if ! mkdir -m 0755 /sys; then
			ewarn "Could not create /sys!"
			return 1
		fi
	fi

	ebegin "Mounting /sys"
	if ! fstabinfo --mount /sys; then
		mount -n -t sysfs -o ${sysfs_opts} sysfs /sys
	fi
	eend $?
}

mount_misc()
{
	# Setup Kernel Support for securityfs
	if [ -d /sys/kernel/security ] && \
		! mountinfo -q /sys/kernel/security; then
		if grep -qs securityfs /proc/filesystems; then
			ebegin "Mounting security filesystem"
			mount -n -t securityfs -o ${sysfs_opts} \
				securityfs /sys/kernel/security
			eend $?
		fi
	fi

	# Setup Kernel Support for debugfs
	if [ -d /sys/kernel/debug ] && ! mountinfo -q /sys/kernel/debug; then
		if grep -qs debugfs /proc/filesystems; then
			ebegin "Mounting debug filesystem"
			mount -n -t debugfs -o ${sysfs_opts} debugfs /sys/kernel/debug
			eend $?
		fi
	fi

	# Setup Kernel Support for tracefs
	if [ -d /sys/kernel/tracing ] && ! mountinfo -q /sys/kernel/tracing; then
		if grep -qs tracefs /proc/filesystems; then
			ebegin "Mounting trace filesystem"
			mount -n -t tracefs -o ${sysfs_opts} tracefs /sys/kernel/tracing
			eend $?
		fi
	fi

	# Setup Kernel Support for configfs
	if [ -d /sys/kernel/config ] && ! mountinfo -q /sys/kernel/config; then
		if grep -qs configfs /proc/filesystems; then
			ebegin "Mounting config filesystem"
			mount -n -t configfs -o  ${sysfs_opts} configfs /sys/kernel/config
			eend $?
		fi
	fi

	# set up kernel support for fusectl
	if [ -d /sys/fs/fuse/connections ] \
		&& ! mountinfo -q /sys/fs/fuse/connections; then
		if grep -qs fusectl /proc/filesystems; then
			ebegin "Mounting fuse control filesystem"
			mount -n -t fusectl -o ${sysfs_opts} \
				fusectl /sys/fs/fuse/connections
			eend $?
		fi
	fi

	# Setup Kernel Support for SELinux
	if [ -d /sys/fs/selinux ] && ! mountinfo -q /sys/fs/selinux; then
		if grep -qs selinuxfs /proc/filesystems; then
			ebegin "Mounting SELinux filesystem"
			mount -t selinuxfs selinuxfs /sys/fs/selinux
			eend $?
		fi
	fi

	# Setup Kernel Support for persistent storage
	if [ -d /sys/fs/pstore ] && ! mountinfo -q /sys/fs/pstore; then
		if grep -qs 'pstore$' /proc/filesystems; then
			ebegin "Mounting persistent storage (pstore) filesystem"
			mount -t pstore pstore -o ${sysfs_opts} /sys/fs/pstore
			eend $?
		fi
	fi

	# set up kernel support for efivarfs
	if [ -d /sys/firmware/efi/efivars ] &&
		! mountinfo -q /sys/firmware/efi/efivars; then
		ebegin "Mounting efivarfs filesystem"
		mount -n -t efivarfs -o ${sysfs_opts} \
			efivarfs /sys/firmware/efi/efivars 2> /dev/null
		eend 0
	fi

	# set up kernel support for bpf filesystem
	if [ -d /sys/fs/bpf ] && ! mountinfo -q /sys/fs/bpf; then
		if grep -qs 'bpf$' /proc/filesystems; then
			ebegin "Mounting bpf filesystem"
			mount -n -t bpf -o ${sysfs_opts} bpf /sys/fs/bpf
			eend $?
		fi
	fi
}

restorecon_sys()
{
	if [ -x /sbin/restorecon ]; then
		ebegin "Restoring SELinux contexts in /sys"
		restorecon -F /sys/devices/system/cpu/online >/dev/null 2>&1
		eend $?
	fi
}

start()
{
	mount_sys
	mount_misc
	restorecon_sys
	return 0
}
