AU: Try delta updates first, then full updates

src/platform/update_engine/test_utils.cc

 // Copyright (c) 2009 The Chromium OS Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "update_engine/test_utils.h"
 #include <sys/stat.h>
 #include <sys/types.h>
 #include <errno.h>
 #include <stdio.h>
 #include <stdlib.h>
@@ skipping 159 matching lines @@
   if (a.size() != b.size())
     return false;
   for (unsigned int i = 0; i < a.size(); i++) {
     EXPECT_EQ(a[i], b[i]) << "offset: " << i;
   }
   return true;
 }
 
 void CreateExtImageAtPath(const string& path, vector<string>* out_paths) {
   // create 10MiB sparse file
-  const char* const mount_path = kMountPath.c_str();
   EXPECT_EQ(0, System(StringPrintf("dd if=/dev/zero of=%s"
                                    " seek=10485759 bs=1 count=1",
                                    path.c_str())));
   EXPECT_EQ(0, System(StringPrintf("mkfs.ext3 -F %s", path.c_str())));
-  EXPECT_EQ(0, System(StringPrintf("mkdir -p %s", mount_path)));
+  EXPECT_EQ(0, System(StringPrintf("mkdir -p %s", kMountPath)));
   EXPECT_EQ(0, System(StringPrintf("mount -o loop %s %s", path.c_str(),
-                                   mount_path)));
-  EXPECT_EQ(0, System(StringPrintf("echo hi > %s/hi", mount_path)));
-  EXPECT_EQ(0, System(StringPrintf("echo hello > %s/hello", mount_path)));
-  EXPECT_EQ(0, System(StringPrintf("mkdir %s/some_dir", mount_path)));
-  EXPECT_EQ(0, System(StringPrintf("mkdir %s/some_dir/empty_dir", mount_path)));
-  EXPECT_EQ(0, System(StringPrintf("mkdir %s/some_dir/mnt", mount_path)));
-  EXPECT_EQ(0, System(StringPrintf("echo T > %s/some_dir/test", mount_path)));
-  EXPECT_EQ(0, System(StringPrintf("mkfifo %s/some_dir/fifo", mount_path)));
-  EXPECT_EQ(0, System(StringPrintf("mknod %s/cdev c 2 3", mount_path)));
-  EXPECT_EQ(0, System(StringPrintf("ln -s /some/target %s/sym", mount_path)));
+                                   kMountPath)));
+  EXPECT_EQ(0, System(StringPrintf("echo hi > %s/hi", kMountPath)));
+  EXPECT_EQ(0, System(StringPrintf("echo hello > %s/hello", kMountPath)));
+  EXPECT_EQ(0, System(StringPrintf("mkdir %s/some_dir", kMountPath)));
+  EXPECT_EQ(0, System(StringPrintf("mkdir %s/some_dir/empty_dir", kMountPath)));
+  EXPECT_EQ(0, System(StringPrintf("mkdir %s/some_dir/mnt", kMountPath)));
+  EXPECT_EQ(0, System(StringPrintf("echo T > %s/some_dir/test", kMountPath)));
+  EXPECT_EQ(0, System(StringPrintf("mkfifo %s/some_dir/fifo", kMountPath)));
+  EXPECT_EQ(0, System(StringPrintf("mknod %s/cdev c 2 3", kMountPath)));
+  EXPECT_EQ(0, System(StringPrintf("ln -s /some/target %s/sym", kMountPath)));
   EXPECT_EQ(0, System(StringPrintf("ln %s/some_dir/test %s/testlink",
-                                   mount_path, mount_path)));
-  EXPECT_EQ(0, System(StringPrintf("umount %s", mount_path)));
+                                   kMountPath, kMountPath)));
+  EXPECT_EQ(0, System(StringPrintf("umount %s", kMountPath)));
   
   if (out_paths) {
     out_paths->clear();
     out_paths->push_back("");
     out_paths->push_back("/hi");
     out_paths->push_back("/hello");
     out_paths->push_back("/some_dir");
     out_paths->push_back("/some_dir/empty_dir");
     out_paths->push_back("/some_dir/mnt");
     out_paths->push_back("/some_dir/test");
@@ skipping 45 matching lines @@
   EXPECT_TRUE(expected_paths.empty());
   if (!expected_paths.empty()) {
     for (set<string>::const_iterator it = expected_paths.begin();
          it != expected_paths.end(); ++it) {
       LOG(INFO) << "extra path: " << *it;
     }
   }
 }
 
 }  // namespace chromeos_update_engine