backup-system-files

#!/usr/bin/su root

set -e

MY_NORMAL_USER="daniel"

# IMPORTANT!!! all this variables path have to be absolute

FILES_FILE="/home/daniel/.system-backupfiles.add"
TMP_FILES_FILE="/tmp/$(basename ${FILES_FILE})"

REGEX_EXCLUDE_FILE="/home/daniel/.system-backupfiles.regex_exclude"

BACKUP_DIR="/home/daniel/system" # cannot have slash in the end !IMPORTANT



# sanity check

mkdir -p ${BACKUP_DIR}
touch ${FILES_FILE} ${REGEX_EXCLUDE_FILE}


# regenerate $FILES_FILE

( cat ${FILES_FILE} && (pacman -Qii | awk '/^MODIFIED/ {print $2}') ) | sort | uniq > ${TMP_FILES_FILE}
egrep -vwf "${REGEX_EXCLUDE_FILE}" ${TMP_FILES_FILE} > ${FILES_FILE}



# delete directories (and files) that are on $BACKUP_DIR and stopped being on $FILES_FILE

(diff -r --exclude="*.sql" --exclude="crontab.$(hostname)*" ${BACKUP_DIR} / | grep ${BACKUP_DIR} | grep -v "diff -r " | awk '{gsub(":", "", $3)} {print $3 $4}' ) | xargs rm -Rf

## also remove the $REGEX_EXCLUDE_FILE files or directories
egrep "${REGEX_EXCLUDE_FILE}" ${TMP_FILES_FILE} | awk '{print "'"${BACKUP_DIR}"'" $0}' | xargs rm -Rf

## remove $BACKUP_DIR empty directories
find ${BACKUP_DIR} -type d -empty -delete


rm -f ${TMP_FILES_FILE}



# update files of $BACKUP_DIR

rsync -a -r --delete --include ".*" --files-from=${FILES_FILE} / ${BACKUP_DIR}

# backup crontab
su - ${MY_NORMAL_USER} -c "crontab -l" > "${BACKUP_DIR}/crontab.$(hostname).${MY_NORMAL_USER}"
crontab -l > "${BACKUP_DIR}/crontab.$(hostname).root"