#!/bin/sh
### Rozhuk Ivan 2020-2023
### clean_system.sh
### 


EXCEPTION_LIST="/sbin/init.bak
/libexec/ld-elf.*
/usr/lib/.*\.a
/usr/lib/clang/.*
/usr/lib/compat
/usr/lib/include/.*
/usr/lib/debug/boot/.*
/usr/lib/libc.so
/usr/lib/libc\+\+.so
/usr/lib/libxnet.so
/usr/lib32/.*\.a
/usr/lib32/libc.so
/usr/lib32/libc\+\+.so
/usr/lib32/libxnet.so
/usr/libdata/ldscripts
/usr/libexec/zfs
/usr/share/certs/trusted/netlab.dhis.org.pem
/usr/share/keys/pkg/revoked
/usr/share/man/whatis
/usr/share/openssl/man/whatis
/usr/share/zfs/compatibility.d"


# Time calculations.
_CUR_TIME=`date '+%s'`
_LIBC_TIME=`stat -f '%B' /lib/libc.so.7`
_MOD_TIME_DAYS=`echo "$(( (((${_CUR_TIME} - ${_LIBC_TIME}) / 86400) + 1) ))"`

# Collect data.
for __DIR2CLEAN in '/bin' '/lib' '/libexec' '/sbin' '/usr/bin' '/usr/lib' '/usr/lib32' '/usr/libdata' '/usr/libexec' '/usr/sbin' '/usr/share'; do
	[ ! -r ${__DIR2CLEAN} ] && continue

	# Too old files.
	_FILES_RAW=`find -x -L "${__DIR2CLEAN}" -mtime +${_MOD_TIME_DAYS} -type f 2>/dev/null`
	_FILES_FILTERED=`echo "${_FILES_FILTERED}";echo "${_FILES_RAW}" | grep -Ev -- "${EXCEPTION_LIST}"`
	_FILES_EXCEPTION=`echo "${_FILES_EXCEPTION}";echo "${_FILES_RAW}" | grep -E -- "${EXCEPTION_LIST}"`

	# Broken symlinks.
	_BROKEN_SYMLINKS_RAW=`find -x -L "${__DIR2CLEAN}" -type l 2>/dev/null`
	_BROKEN_SYMLINKS_FILTERED=`echo "${_BROKEN_SYMLINKS_FILTERED}";echo "${_BROKEN_SYMLINKS_RAW}" | grep -Ev -- "${EXCEPTION_LIST}"`
	_BROKEN_SYMLINKS_EXCEPTION=`echo "${_BROKEN_SYMLINKS_EXCEPTION}";echo "${_BROKEN_SYMLINKS_RAW}" | grep -E -- "${EXCEPTION_LIST}"`

	# Empty folders.
	_EMPTY_DIRS_RAW=`find -x "${__DIR2CLEAN}" -type d -empty 2>/dev/null`
	_EMPTY_DIRS_FILTERED=`echo "${_EMPTY_DIRS_FILTERED}";echo "${_EMPTY_DIRS_RAW}" | grep -Ev -- "${EXCEPTION_LIST}"`
	_EMPTY_DIRS_EXCEPTION=`echo "${_EMPTY_DIRS_EXCEPTION}";echo "${_EMPTY_DIRS_RAW}" | grep -E -- "${EXCEPTION_LIST}"`
done


# Show elements to autoremove.
if [ -n "${_FILES_FILTERED}" ]; then
	echo 'Files for auto remove:'
	echo "${_FILES_FILTERED}"
	echo '=========================================================='
	echo ''
fi
if [ -n "${_EMPTY_DIRS_FILTERED}" ]; then
	echo 'Empty dirs for auto remove:'
	echo "${_EMPTY_DIRS_FILTERED}"
	echo '=========================================================='
	echo ''
fi
if [ -n "${_BROKEN_SYMLINKS_FILTERED}" ]; then
	echo 'Broken symlinks for auto remove:'
	echo "${_BROKEN_SYMLINKS_FILTERED}"
	echo '=========================================================='
	echo ''
fi

# Show elements for manual deletion.
if [ "${1}" == '-m' ]; then
	if [ -n "${_FILES_EXCEPTION}" ]; then
		echo 'Files for manual remove:'
		echo "${_FILES_EXCEPTION}"
		echo '=========================================================='
		echo ''
	fi
	if [ -n "${_EMPTY_DIRS_EXCEPTION}" ]; then
		echo 'Empty dirs for manual remove:'
		echo "${_EMPTY_DIRS_EXCEPTION}"
		echo '=========================================================='
		echo ''
	fi
	if [ -n "${_BROKEN_SYMLINKS_EXCEPTION}" ]; then
		echo 'Broken symlinks for manual remove:'
		echo "${_BROKEN_SYMLINKS_EXCEPTION}"
		echo '=========================================================='
		echo ''
	fi
fi

# Remove elements if -y is set.
if [ "${1}" == '-y' ]; then
	for __ITEM2RM in ${_FILES_FILTERED}; do
		rm -f ${__ITEM2RM}
	done
	for __ITEM2RM in ${_BROKEN_SYMLINKS_FILTERED}; do
		rm -f ${__ITEM2RM}
	done
	for __ITEM2RM in ${_EMPTY_DIRS_FILTERED}; do
		rm -rf ${__ITEM2RM}
	done
	rm -f /etc/rc.d/abi
fi