| # Copyright (c) 2011 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. |
| |
| """This module manages interactions between an image and a public key.""" |
| |
| import os |
| import tempfile |
| |
| import cros_build_lib as cros_lib |
| |
| class PublicKeyManager(object): |
| """Class wrapping interactions with a public key on an image.""" |
| TARGET_KEY_PATH = 'usr/share/update_engine/update-payload-key.pub.pem' |
| |
| def __init__(self, image_path, key_path): |
| """Initializes a manager with image_path and key_path we plan to insert.""" |
| self.image_path = image_path |
| self.key_path = key_path |
| self._rootfs_dir = tempfile.mkdtemp(suffix='rootfs', prefix='tmp') |
| self._stateful_dir = tempfile.mkdtemp(suffix='stateful', prefix='tmp') |
| |
| # Gather some extra information about the image. |
| try: |
| cros_lib.MountImage(image_path, self._rootfs_dir, self._stateful_dir, |
| read_only=True) |
| self._full_target_key_path = os.path.join( |
| self._rootfs_dir, PublicKeyManager.TARGET_KEY_PATH) |
| self._is_key_new = True |
| if os.path.exists(self._full_target_key_path): |
| diff_output = cros_lib.RunCommand(['diff', |
| self.key_path, |
| self._full_target_key_path], |
| print_cmd=False, redirect_stdout=True, |
| redirect_stderr=True, error_ok=True) |
| |
| if not diff_output: self._is_key_new = False |
| |
| finally: |
| cros_lib.UnmountImage(self._rootfs_dir, self._stateful_dir) |
| |
| def __del__(self): |
| """Remove our temporary directories we created in init.""" |
| os.rmdir(self._rootfs_dir) |
| os.rmdir(self._stateful_dir) |
| |
| def AddKeyToImage(self): |
| """Adds the key specified in init to the image.""" |
| if not self._is_key_new: |
| cros_lib.Info('Public key already on image %s. No work to do.' % |
| self.image_path) |
| return |
| |
| cros_lib.Info('Copying %s into %s' % (self.key_path, self.image_path)) |
| try: |
| cros_lib.MountImage(self.image_path, self._rootfs_dir, self._stateful_dir, |
| read_only=False) |
| |
| dir_path = os.path.dirname(self._full_target_key_path) |
| cros_lib.RunCommand(['sudo', 'mkdir', '--parents', dir_path], |
| print_cmd=True) |
| cros_lib.RunCommand(['sudo', 'cp', '--force', '-p', self.key_path, |
| self._full_target_key_path], print_cmd=True) |
| finally: |
| cros_lib.UnmountImage(self._rootfs_dir, self._stateful_dir) |
| self._MakeImageBootable() |
| |
| def _MakeImageBootable(self): |
| """Makes the image bootable. Note, it is only useful for non-vm images.""" |
| image = os.path.basename(self.image_path) |
| if 'qemu' in image: |
| return |
| |
| from_dir = os.path.dirname(self.image_path) |
| cros_lib.RunCommand(['bin/cros_make_image_bootable', |
| cros_lib.ReinterpretPathForChroot(from_dir), |
| image, '--force_developer_mode'], print_cmd=False, |
| redirect_stdout=True, redirect_stderr=True, |
| enter_chroot=True, cwd=cros_lib.GetCrosUtilsPath()) |