#!/bin/sh

# Example config:
#	[backup-manager]
#	user root
#	env.backup_dir /path/to/your/backups/
#	env.lifetime 2
#	env.archive_pattern *.tar.bz2
#	env.backup_number 4

# Configuration directives, edit before first use.
BACKUP_DIR=${backup_dir:-/data/backup}
ARCHIVE_PATTERN="${archive_pattern:-*.tar.bz2}"
# How old backups should be considered as non-yound anymore in [days].
LIFETIME=${lifetime:-2}
# Critical states will be issued when the number of fresh backups archives is below `backup_number`,
# and warnings below `backup_number*lifetime`
CRIT=${backup_number:-1}
WARN=$((${CRIT}*${LIFETIME}))

# The situation is critical if there are no young files, the backup is down.
case $1 in
   config)
        cat << EOF
graph_title Fresh (<=${LIFETIME}d) backups archives in ${BACKUP_DIR}
graph_vlabel number
graph_args -l 0
graph_category system
freshcount.label number
freshcount.critical ${CRIT}:
freshcount.warning ${WARN}:
EOF
        exit 0;;
esac

printf "freshcount.value "
find $BACKUP_DIR -name "${ARCHIVE_PATTERN}" -a -mtime -$LIFETIME | wc  -l
printf "freshcount.extinfo "
du -sh $BACKUP_DIR