Remove test keys from images we test with in the test harness.

bin/au_test_harness/public_key_manager.py

Index: bin/au_test_harness/public_key_manager.py
diff --git a/bin/au_test_harness/public_key_manager.py b/bin/au_test_harness/public_key_manager.py
new file mode 100644
index 0000000000000000000000000000000000000000..355e7445fdb82664472f592656b00c04c4f0761e
--- /dev/null
+++ b/bin/au_test_harness/public_key_manager.py
@@ -0,0 +1,91 @@
+# 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=False)
+      cros_lib.RunCommand(['sudo', 'cp', '--force', '-p', self.key_path,
+                           self._full_target_key_path], print_cmd=False)
+    finally:
+      cros_lib.UnmountImage(self._rootfs_dir, self._stateful_dir)
+      self._MakeImageBootable()
+
+  def RemoveKeyFromImage(self):
+    """Removes the key specified in init from the image."""
+    cros_lib.Info('Removing public key from image %s.' % self.image_path)
+    try:
+      cros_lib.MountImage(self.image_path, self._rootfs_dir, self._stateful_dir,
+                          read_only=False)
+      cros_lib.RunCommand(['sudo', 'rm', '--force', self._full_target_key_path],
+                          print_cmd=False)
+    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], print_cmd=False, redirect_stdout=True,
+                        redirect_stderr=True, enter_chroot=True,
+                        cwd=cros_lib.CROSUTILS_DIRECTORY)