remove stale locks

shell/restic_backup.sh

@@ -90,14 +90,24 @@ function check_restic() {
 # begin timestamp
 echo "== ${TIMESTAMP} ==" >> "${LOGFILE}"
 
-# create a new snapshot
-restic --quiet -r "${REPO}" \
-  backup --no-scan \
+# remove stale locks
+restic -r "${REPO}" \
   --password-file="${RKEY}" \
-  --exclude-file="${EXCL}" \
-  "${RSRC}" >> "${LOGFILE}"
+  unlock >> "${LOGFILE}"
 _EC=$?
 
+# create a new snapshot
+if [[ $_EC -eq 0 ]]; then
+  restic --quiet -r "${REPO}" \
+    backup --no-scan \
+    --password-file="${RKEY}" \
+    --exclude-file="${EXCL}" \
+    "${RSRC}" >> "${LOGFILE}"
+  _EC=$?
+else
+  echo "Non-zero exit from restic unlock: $_EC" >> "${LOGFILE}"
+fi
+
 # prune older snapshots
 if [[ $_EC -eq 0 ]]; then
   restic --quiet -r "${REPO}" \