feat(restic): add scripts for directory backup and snapshot metrics generation

roles/restic/files/restic-backup-directories.sh

@@ -0,0 +1,37 @@
+#!/usr/bin/env bash
+
+set -euo pipefail
+
+if [[ -n ${RESTIC_PRE_BACKUP_HOOK-} ]]; then
+    /bin/bash -c "$RESTIC_PRE_BACKUP_HOOK"
+fi
+
+echo "List existing snapshots or initialize repository"
+restic snapshots || restic init
+sleep 2;
+
+echo "Attempting to remove lock if present"
+restic unlock
+sleep 2
+
+echo "Start backup on ${@:1}"
+restic --verbose --retry-lock=${RESTIC_RETRY_LOCK:-5m} backup "${@:1}"
+sleep 2
+
+echo "Forget and prune old snapshots"
+restic forget --prune --retry-lock=${RESTIC_RETRY_LOCK:-5m} \
+    --keep-within=${RESTIC_FORGET_KEEP_WITHIN:-1d} \
+    --keep-hourly=${RESTIC_FORGET_KEEP_HOURLY:-6} \
+    --keep-daily=${RESTIC_FORGET_KEEP_DAILY:-2} \
+    --keep-weekly=${RESTIC_FORGET_KEEP_WEEKLY:-7} \
+    --keep-monthly=${RESTIC_FORGET_KEEP_MONTHLY:-4} \
+    --verbose
+sleep 2
+
+echo "Generate snapshot metrics"
+restic --json snapshots | /opt/restic-generate-snapshot-metrics.sh \
+    > /var/lib/node_exporter/restic-snapshots-${RESTIC_JOBNAME:-unknown}.prom-src
+sleep 2
+
+echo "Check repository"
+restic check

roles/restic/files/restic-generate-snapshot-metrics.sh

@@ -0,0 +1,12 @@
+#!/usr/bin/env bash
+
+RESTIC_JSON=$(</dev/stdin)
+
+echo $RESTIC_JSON | jq -r '.[]
+    | {
+        "hostname": .hostname,
+        "username": .username,
+	"short_id": .short_id,
+        "time": ((((.time | split(".")[0]) + "Z") | fromdate) - (3600 * (.time | split("+")[1] | split(":")[0] | tonumber + 1))),
+        "paths": .paths[]
+    } | "restic_snapshots{hostname=\"\(.hostname)\",username=\"\(.username)\",short_id=\"\(.short_id)\",paths=\"\(.paths)\"} \(.time)"'