[backup-manager] Rudimentary backup-manager plugin

Signed-off-by: Olivier Mehani <shtrom@ssji.net>

plugins/backup/backup-manager

@@ -0,0 +1,39 @@
+#!/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