#!/usr/bin/env bash
# pick - Install some AppArmor profile(s)
# Copyright (C) 2021 Alexandre Pujol <alexandre@pujol.io>
# SPDX-License-Identifier: GPL-2.0-only

set -eu

DISTRIBUTION="$(lsb_release --id --short)"
readonly DISTRIBUTION="${DISTRIBUTION,,}"

_set_complain() {
	local path="$1"
	[[ -d "$path" ]] && return
	flags="$(grep -o -m 1 'flags=(.*)' "$path" | cut -d '(' -f2 | cut -d ')' -f1)"
	[[ "$flags" =~ complain ]] && return
	sed -e "s/flags=(.*)//" \
	 	-e "s/ {$/ flags=(complain $flags) {/" \
		-i "$path"
}

_install_abstractions() {
	mapfile -t abstractions < <(find apparmor.d/abstractions/ -type f -printf "%P\n")
	for file in "${abstractions[@]}"; do
		install -Dm0644 "apparmor.d/abstractions/$file" \
						"/etc/apparmor.d/abstractions/$file"
	done
}

_install_tunables() {
	for path in apparmor.d/tunables/*; do
		install -Dm0644 "$path" "/etc/apparmor.d/tunables/$(basename "$path")"
	done
	if [[ "$DISTRIBUTION" != "arch" ]]; then
		sed -i -e '/Archlinux/d' /etc/apparmor.d/tunables/extend
		sed -i -e '/etc/d' /etc/apparmor.d/tunables/global
	fi
}

_reload_apparmor() {
	systemctl restart apparmor || true
	systemctl status apparmor
}

pick() {
	for profile in "$@"; do
		path="$(find apparmor.d -iname "$profile" -type f -not -path './apparmor.d/tunables/*' -not -path './apparmor.d/abstractions/*')"
		if [[ -f "$path" ]]; then
			install -Dm0644 "$path" "/etc/apparmor.d/$profile"
			[[ "$COMPLAIN" == 1 ]] && _set_complain "/etc/apparmor.d/$profile"
		fi
	done
}

# Print help message
cmd_help() {
	cat <<-_EOF
	./pick [options] <profiles> - Install some AppArmor profile(s)

	Options:
	    -c, --complain  Set profile on complain mode
	    -h, --help      Print this help message and exit
	_EOF
}

main() {
	local opts err
	small_arg="ch"
	long_arg="complain,help"
	opts="$(getopt -o $small_arg -l $long_arg -n "pick" -- "$@")"
	err=$?
	eval set -- "$opts"
	while true; do case $1 in
		-c|--complain) COMPLAIN=1; shift ;;
		-h|--help) shift; cmd_help; exit 0 ;;
		--) shift; break ;;
	esac done
	[[ $err -ne 0 ]] && { cmd_help; exit 1; }

	_install_abstractions
	_install_tunables
	pick "$@" && _reload_apparmor
}

COMPLAIN=0
main "$@"