From c2a145ff33017a14e46f32720dd3435d95283ef7 Mon Sep 17 00:00:00 2001
From: Paul Lawrence <paullawrence@google.com>
Date: Wed, 15 May 2019 09:42:04 -0700
Subject: [PATCH] Fail startCheckpoint if checkpoints not supported

Bug: 131815738
Test: vdc checkpoint startCheckpoint 2 succeeds on blueline
      It fails with a modified fstab with no checkpoint=fs flag

Change-Id: I6d55810a1f711a670f18fbd10d8779c15f4e3cba
---
 Checkpoint.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/Checkpoint.cpp b/Checkpoint.cpp
index ba9af11..56ec782 100644
--- a/Checkpoint.cpp
+++ b/Checkpoint.cpp
@@ -125,6 +125,10 @@ Status cp_supportsFileCheckpoint(bool& result) {
 }
 
 Status cp_startCheckpoint(int retry) {
+    bool result;
+    if (!cp_supportsCheckpoint(result).isOk() || !result)
+        return error(ENOTSUP, "Checkpoints not supported");
+
     if (retry < -1) return error(EINVAL, "Retry count must be more than -1");
     std::string content = std::to_string(retry + 1);
     if (retry == -1) {