AU: delta compress the kernel partition

src/platform/update_engine/generate_delta_main.cc

 // Copyright (c) 2009 The Chromium 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 <sys/types.h>
 #include <sys/stat.h>
 #include <errno.h>
 #include <fcntl.h>
 #include <unistd.h>
 #include <set>
 #include <string>
 #include <vector>
 #include <gflags/gflags.h>
 #include <glib.h>
 #include "base/command_line.h"
 #include "chromeos/obsolete_logging.h"
 #include "update_engine/delta_diff_generator.h"
 #include "update_engine/delta_performer.h"
 #include "update_engine/subprocess.h"
 #include "update_engine/update_metadata.pb.h"
 #include "update_engine/utils.h"
 
 DEFINE_string(old_dir, "",
               "Directory where the old rootfs is loop mounted read-only");
 DEFINE_string(new_dir, "",
               "Directory where the new rootfs is loop mounted read-only");
 DEFINE_string(old_image, "", "Path to the old rootfs");
 DEFINE_string(new_image, "", "Path to the new rootfs");
 DEFINE_string(out_file, "", "Path to output file");
+DEFINE_string(old_kernel, "", "Path to the old kernel partition image");
+DEFINE_string(new_kernel, "", "Path to the new kernel partition image");
 DEFINE_string(apply_delta, "",
               "If set, apply delta over old_image. (For debugging.)");
 
 // This file contains a simple program that takes an old path, a new path,
 // and an output file as arguments and the path to an output file and
 // generates a delta that can be sent to Chrome OS clients.
 
 using std::set;
 using std::string;
 using std::vector;
@@ skipping 31 matching lines @@
       ssize_t bytes_read;
       CHECK(utils::PReadAll(fd, &buf[0], buf.size(), offset, &bytes_read));
       if (bytes_read == 0)
         break;
       CHECK_EQ(performer.Write(&buf[0], bytes_read), bytes_read);
     }
     CHECK_EQ(performer.Close(), 0);
     LOG(INFO) << "done applying delta.";
     return 0;
   }
-  if (FLAGS_old_dir.empty() || FLAGS_new_dir.empty() ||
-      FLAGS_old_image.empty() || FLAGS_new_image.empty() ||
-      FLAGS_out_file.empty()) {
-    LOG(FATAL) << "Missing required argument(s)";
-  }
+  CHECK(!FLAGS_old_dir.empty());
+  CHECK(!FLAGS_new_dir.empty());
+  CHECK(!FLAGS_old_image.empty());
+  CHECK(!FLAGS_new_image.empty());
+  CHECK(!FLAGS_out_file.empty());
+  CHECK(!FLAGS_old_kernel.empty());
+  CHECK(!FLAGS_new_kernel.empty());
   if ((!IsDir(FLAGS_old_dir.c_str())) || (!IsDir(FLAGS_new_dir.c_str()))) {
     LOG(FATAL) << "old_dir or new_dir not directory";
   }
   
   DeltaDiffGenerator::GenerateDeltaUpdateFile(FLAGS_old_dir,
                                               FLAGS_old_image,
                                               FLAGS_new_dir,
                                               FLAGS_new_image,
+                                              FLAGS_old_kernel,
+                                              FLAGS_new_kernel,
                                               FLAGS_out_file);
 
   return 0;
 }
 
 }  // namespace {}
 
 }  // namespace chromeos_update_engine
 
 int main(int argc, char** argv) {
   return chromeos_update_engine::Main(argc, argv);
 }