blob: e75145dedc4ce6d47a487f0a00058c59ca95970f [file] [log] [blame]
# 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())