AU: Verify source rootfs/kernel hashes before applying delta.

delta_performer_unittest.cc

Index: delta_performer_unittest.cc
diff --git a/delta_performer_unittest.cc b/delta_performer_unittest.cc
index e0db6e7733454287e8c3a07bc2de272e935959a9..4f6661e4803d6bb3ff46bbeedba6b56cabf3daa1 100755
--- a/delta_performer_unittest.cc
+++ b/delta_performer_unittest.cc
@@ -258,12 +258,14 @@ TEST(DeltaPerformerTest, RunAsRootSmallImageTest) {
     EXPECT_EQ(expected_sig_data_length, manifest.signatures_size());
     EXPECT_FALSE(signature.data().empty());
 
-    EXPECT_EQ(old_kernel_data.size(), manifest.old_kernel_info().size());
+    // TODO(petkov): Add a test once the generator start sending old kernel
+    // info.
+    EXPECT_FALSE(manifest.has_old_kernel_info());
+
     EXPECT_EQ(new_kernel_data.size(), manifest.new_kernel_info().size());
     EXPECT_EQ(image_size, manifest.old_rootfs_info().size());
     EXPECT_EQ(image_size, manifest.new_rootfs_info().size());
 
-    EXPECT_FALSE(manifest.old_kernel_info().hash().empty());
     EXPECT_FALSE(manifest.new_kernel_info().hash().empty());
     EXPECT_FALSE(manifest.old_rootfs_info().hash().empty());
     EXPECT_FALSE(manifest.new_rootfs_info().hash().empty());
@@ -289,6 +291,11 @@ TEST(DeltaPerformerTest, RunAsRootSmallImageTest) {
   EXPECT_EQ(0, performer.Open(a_img.c_str(), 0, 0));
   EXPECT_TRUE(performer.OpenKernel(old_kernel.c_str()));
 
+  vector<char> rootfs_hash;
+  CHECK_EQ(image_size,
+           OmahaHashCalculator::RawHashOfFile(a_img, image_size, &rootfs_hash));
+  performer.set_current_rootfs_hash(&rootfs_hash);
+
   // Write at some number of bytes per operation. Arbitrarily chose 5.
   const size_t kBytesPerWrite = 5;
   for (size_t i = 0; i < delta.size(); i += kBytesPerWrite) {