sanity check on publish, allow overriding the mount/unmount/findmnt command timeout

Signed-off-by: Travis Glenn Hansen <travisghansen@yahoo.com>

src/driver/index.js

@@ -1054,6 +1054,15 @@ class CsiBaseDriver {
             normalized_staging_path = staging_target_path;
           }
 
+          // sanity check to ensure the staged path is actually mounted
+          result = await mount.pathIsMounted(normalized_staging_path);
+          if (!result) {
+            throw new GrpcError(
+              grpc.status.FAILED_PRECONDITION,
+              `staging path is not mounted: ${normalized_staging_path}`
+            );
+          }
+
           result = await mount.pathIsMounted(target_path);
           // if not mounted, mount
           if (!result) {

src/utils/mount.js

@@ -10,7 +10,7 @@ FINDMNT_COMMON_OPTIONS = [
   "--nofsroot", // prevents unwanted behavior with cifs volumes
 ];
 
-DEFAUT_TIMEOUT = 30000;
+DEFAUT_TIMEOUT = process.env.MOUNT_DEFAULT_TIMEOUT || 30000;
 
 class Mount {
   constructor(options = {}) {