AU: Class to perform delta updates.

src/platform/update_engine/test_utils.h

Index: src/platform/update_engine/test_utils.h
diff --git a/src/platform/update_engine/test_utils.h b/src/platform/update_engine/test_utils.h
index bba3ed1b68215729893fb5db046f3a19d39f048f..fe0f4886c260bdba8a500f0fc84d1eded002ab1f 100644
--- a/src/platform/update_engine/test_utils.h
+++ b/src/platform/update_engine/test_utils.h
@@ -10,6 +10,7 @@
 #include <vector>
 #include <gtest/gtest.h>
 #include "update_engine/action.h"
+#include "update_engine/subprocess.h"
 
 // These are some handy functions for unittests.
 
@@ -105,6 +106,22 @@ void CreateExtImageAtPath(const std::string& path,
 void VerifyAllPaths(const std::string& parent,
                     std::set<std::string> expected_paths);
 
+class ScopedLoopbackDeviceReleaser {
+ public:
+  explicit ScopedLoopbackDeviceReleaser(const std::string& dev) : dev_(dev) {}
+  ~ScopedLoopbackDeviceReleaser() {
+    std::vector<std::string> args;
+    args.push_back("/sbin/losetup");
+    args.push_back("-d");
+    args.push_back(dev_);
+    int return_code = 0;
+    EXPECT_TRUE(Subprocess::SynchronousExec(args, &return_code));
+    EXPECT_EQ(0, return_code);
+  }
+ private:
+  const std::string dev_;

[Daniel Erat, 2010/04/23 17:47:25]

add DISALLOW_COPY_AND_ASSIGN (especially for RAII-ish classes)

[adlr, 2010/04/23 20:50:17]

Done.

+};
+
 // Useful actions for test
 
 class NoneType;