AU: Start checkpointing update progress.

generate_delta_main.cc

-// Copyright (c) 2009 The Chromium Authors. All rights reserved.
+// Copyright (c) 2010 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 <sys/types.h>
 #include <sys/stat.h>
 #include <errno.h>
 #include <fcntl.h>
 #include <unistd.h>
+
 #include <set>
 #include <string>
 #include <vector>
+
+#include <base/command_line.h>
+#include <base/logging.h>
 #include <gflags/gflags.h>
 #include <glib.h>
-#include "base/command_line.h"
-#include "base/logging.h"
+
 #include "update_engine/delta_diff_generator.h"
 #include "update_engine/delta_performer.h"
+#include "update_engine/prefs.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(private_key, "", "Path to private key in .pem format");
 DEFINE_string(apply_delta, "",
               "If set, apply delta over old_image. (For debugging.)");
+DEFINE_string(prefs_dir, "/tmp/update_engine_prefs",
+              "Preferences directory, used with apply_delta.");
 
 // 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;
 
 namespace chromeos_update_engine {
@@ skipping 12 matching lines @@
   CommandLine::Init(argc, argv);
   Subprocess::Init();
   logging::InitLogging("delta_generator.log",
                        logging::LOG_ONLY_TO_SYSTEM_DEBUG_LOG,
                        logging::DONT_LOCK_LOG_FILE,
                        logging::APPEND_TO_OLD_LOG_FILE);
   if (!FLAGS_apply_delta.empty()) {
     if (FLAGS_old_image.empty()) {
       LOG(FATAL) << "Must pass --old_image with --apply_delta.";
     }
-    DeltaPerformer performer;
+    Prefs prefs;
+    LOG(INFO) << "Setting up preferences under: " << FLAGS_prefs_dir;
+    LOG_IF(ERROR, !prefs.Init(FilePath(FLAGS_prefs_dir)))
+        << "Failed to initialize preferences.";
+    DeltaPerformer performer(&prefs);
     CHECK_EQ(performer.Open(FLAGS_old_image.c_str(), 0, 0), 0);
     CHECK(performer.OpenKernel(FLAGS_old_kernel.c_str()));
     vector<char> buf(1024 * 1024);
     int fd = open(FLAGS_apply_delta.c_str(), O_RDONLY, 0);
     CHECK_GE(fd, 0);
     ScopedFdCloser fd_closer(&fd);
     for (off_t offset = 0;; offset += buf.size()) {
       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;
   }
   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,
                                               FLAGS_private_key);
 
   return 0;
 }
 
 }  // namespace {}
 
 }  // namespace chromeos_update_engine
 
 int main(int argc, char** argv) {
   return chromeos_update_engine::Main(argc, argv);
 }