Check free storage before upgrading

scripts/upgrade.sh

@@ -20,6 +20,14 @@ if [ ! -e "$PEERTUBE_PATH/versions" -o ! -e "$PEERTUBE_PATH/config/production.ya
   exit 1
 fi
 
+REMAINING=$(df -k $PEERTUBE_PATH | awk '{ print $4}' | sed -n 2p)
+ONE_GB=$((1024 * 1024))
+if [ "$REMAINING" -lt "$ONE_GB" ]; then
+  echo "Error - not enough free space for upgrading"
+  echo ""
+  echo "Make sure you have at least 1 GB of free space in $PEERTUBE_PATH"
+  exit 1
+fi
 
 # Backup database
 SQL_BACKUP_PATH="$PEERTUBE_PATH/backup/sql-peertube_prod-$(date +"%Y%m%d-%H%M").bak"