feat(restic): migrate to systemd template units

roles/restic/files/restic-backup.sh

@@ -0,0 +1,43 @@
+#!/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 1;
+
+echo "Attempting to remove lock if present"
+restic unlock
+sleep 1;
+
+echo "Start backup on ${@:1}"
+restic --verbose --retry-lock=${RESTIC_RETRY_LOCK:-5m} backup "${@:1}"
+sleep 1;
+
+if [[ -n ${RESTIC_POIST_BACKUP_HOOK-} ]]; then
+    /bin/bash -c "$RESTIC_POST_BACKUP_HOOK"
+fi
+
+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"
+if [[ -n ${RESTIC_GENERATE_SNAPSHOT_METRICS_COMMAND-} ]]; then
+    restic --json snapshots | ${RESTIC_GENERATE_SNAPSHOT_METRICS_COMMAND} \
+        > /var/lib/node_exporter/restic-snapshots-${RESTIC_JOBNAME:-unknown}.prom-src
+    sleep 2;
+fi
+
+echo "Check repository"
+restic check