blob: 08ee8df184889d423fae7623cc15792b6364ebb2 [file] [log] [blame]
// 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 "base/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;
namespace chromeos_update_engine {
namespace {
bool IsDir(const char* path) {
struct stat stbuf;
TEST_AND_RETURN_FALSE_ERRNO(lstat(path, &stbuf) == 0);
return S_ISDIR(stbuf.st_mode);
}
int Main(int argc, char** argv) {
g_thread_init(NULL);
google::ParseCommandLineFlags(&argc, &argv, true);
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;
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);
return 0;
}
} // namespace {}
} // namespace chromeos_update_engine
int main(int argc, char** argv) {
return chromeos_update_engine::Main(argc, argv);
}