function include_mount_options_functions {
	:
}

# $1: type of filesystem
# $2: new mount point option
# $3: filesystem of new mount point (used when adding new entry in fstab)
# $4: mount type of new mount point (used when adding new entry in fstab)
function ensure_mount_option_for_vfstype {
        local _vfstype="$1" _new_opt="$2" _filesystem=$3 _type=$4 _vfstype_points=()
        readarray -t _vfstype_points < <(grep -E "[[:space:]]${_vfstype}[[:space:]]" /etc/fstab | awk '{print $2}')

        for _vfstype_point in "${_vfstype_points[@]}"
        do
                ensure_mount_option_in_fstab "$_vfstype_point" "$_new_opt" "$_filesystem" "$_type"
        done
}

# $1: mount point
# $2: new mount point option
# $3: device or virtual string (used when adding new entry in fstab)
# $4: mount type of mount point (used when adding new entry in fstab)
function ensure_mount_option_in_fstab {
	local _mount_point="$1" _new_opt="$2" _device=$3 _type=$4
	local _mount_point_match_regexp="" _previous_mount_opts=""
	_mount_point_match_regexp="$(get_mount_point_regexp "$_mount_point")"

	if [ "$(grep -c "$_mount_point_match_regexp" /etc/fstab)" -eq 0 ]; then
		# runtime opts without some automatic kernel/userspace-added defaults
		_previous_mount_opts=$(grep "$_mount_point_match_regexp" /etc/mtab | head -1 |  awk '{print $4}' \
					| sed -E "s/(rw|defaults|seclabel|${_new_opt})(,|$)//g;s/,$//")
		[ "$_previous_mount_opts" ] && _previous_mount_opts+=","
		echo "${_device} ${_mount_point} ${_type} defaults,${_previous_mount_opts}${_new_opt} 0 0" >> /etc/fstab
	elif [ "$(grep "$_mount_point_match_regexp" /etc/fstab | grep -c "$_new_opt")" -eq 0 ]; then
		_previous_mount_opts=$(grep "$_mount_point_match_regexp" /etc/fstab | awk '{print $4}')
		sed -i "s|\(${_mount_point_match_regexp}.*${_previous_mount_opts}\)|\1,${_new_opt}|" /etc/fstab
	fi
}

# $1: mount point
function get_mount_point_regexp {
		printf "[[:space:]]%s[[:space:]]" "$1"
}

# $1: mount point
function assert_mount_point_in_fstab {
	local _mount_point_match_regexp
	_mount_point_match_regexp="$(get_mount_point_regexp "$1")"
	grep "$_mount_point_match_regexp" -q /etc/fstab \
		|| { echo "The mount point '$1' is not even in /etc/fstab, so we can't set up mount options" >&2; return 1; }
}

# $1: mount point
function remove_defaults_from_fstab_if_overriden {
	local _mount_point_match_regexp
	_mount_point_match_regexp="$(get_mount_point_regexp "$1")"
	if grep "$_mount_point_match_regexp" /etc/fstab | grep -q "defaults,"
	then
		sed -i "s|\(${_mount_point_match_regexp}.*\)defaults,|\1|" /etc/fstab
	fi
}

# $1: mount point
function ensure_partition_is_mounted {
	local _mount_point="$1"
	mkdir -p "$_mount_point" || return 1
	if mountpoint -q "$_mount_point"; then
		mount -o remount --target "$_mount_point"
	else
		mount --target "$_mount_point"
	fi
}
include_mount_options_functions

function perform_remediation {
	# test "$mount_has_to_exist" = 'yes'
	if test "yes" = 'yes'; then
		assert_mount_point_in_fstab /var/log/audit || { echo "Not remediating, because there is no record of /var/log/audit in /etc/fstab" >&2; return 1; }
	fi

	ensure_mount_option_in_fstab "/var/log/audit" "nodev" "" ""

	ensure_partition_is_mounted "/var/log/audit"
}

perform_remediation

- name: get back mount information associated to mountpoint
  command: findmnt --fstab '/var/log/audit'
  register: device_name
  failed_when: device_name.rc > 1
  changed_when: false
  when: ansible_virtualization_role != "guest" or ansible_virtualization_type != "docker"
  tags:
    - mount_option_var_log_audit_nodev
    - medium_severity
    - configure_strategy
    - low_complexity
    - high_disruption
    - no_reboot_needed
    - CCE-82080-3
    - NIST-800-53-CM-7
    - NIST-800-53-MP-2

- name: create mount_info dictionary variable
  set_fact:
    mount_info: '{{ mount_info|default({})|combine({item.0: item.1}) }}'
  with_together:
    - '{{ device_name.stdout_lines[0].split() | list | lower }}'
    - '{{ device_name.stdout_lines[1].split() | list }}'
  when:
    - device_name.stdout is defined and device_name.stdout_lines is defined
    - (device_name.stdout | length > 0)
    - ansible_virtualization_role != "guest" or ansible_virtualization_type != "docker"
  tags:
    - mount_option_var_log_audit_nodev
    - medium_severity
    - configure_strategy
    - low_complexity
    - high_disruption
    - no_reboot_needed
    - CCE-82080-3
    - NIST-800-53-CM-7
    - NIST-800-53-MP-2

- name: Ensure permission nodev are set on /var/log/audit
  mount:
    path: /var/log/audit
    src: '{{ mount_info.source }}'
    opts: '{{ mount_info.options }},nodev'
    state: mounted
    fstype: '{{ mount_info.fstype }}'
  when:
    - device_name.stdout is defined
    - (device_name.stdout | length > 0)
    - ansible_virtualization_role != "guest" or ansible_virtualization_type != "docker"
  tags:
    - mount_option_var_log_audit_nodev
    - medium_severity
    - configure_strategy
    - low_complexity
    - high_disruption
    - no_reboot_needed
    - CCE-82080-3
    - NIST-800-53-CM-7
    - NIST-800-53-MP-2

part /var/log/audit --mountoptions="nodev"