check-zfs-snapshot-backup.sh

#!/usr/bin/bash
# Thomas Merkel <[email protected]>
# Script created in 5 minutes to check if a snapshot exists on
# the machine that is created with the timestamp from yesterday.

# Which datasets would we check
ADMIN_MAIL="[email protected]"
CHECK_DATASETS="
zones/2510db0b-81ef-46bc-b38e-c5ffcbe48403/data/mbox-01
"

# Function
pipe_if_not_empty () {
        input=$(cat);
        if [ "x$input" != x"" ]; then
                { printf '%s\n' "${input}"; } | "$@"
        fi
}

# Main
yesterday=$(date -d yesterday +%Y-%m-%d)
snapshots=$(zfs list -t snapshot -o name)

for dataset in ${CHECK_DATASETS}; do
        if [[ $(echo ${snapshots} | grep -c "${dataset}@${yesterday}") -eq 0 ]]; then
                echo "Not found: ${dataset}@${yesterday}"
        fi
done | pipe_if_not_empty mailx -s "zbackup missing on $(hostname)" ${ADMIN_MAIL}