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151 lines
5.2 KiB
151 lines
5.2 KiB
#!/usr/bin/env python
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#
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# Copyright 2016 - The Android Open Source Project
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""Kernel Swapper.
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This class manages swapping kernel images for a Cloud Android instance.
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"""
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import subprocess
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from acloud import errors
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from acloud.public import report
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from acloud.internal.lib import android_compute_client
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from acloud.internal.lib import auth
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from acloud.internal.lib import utils
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# ssh flags used to communicate with the Cloud Android instance.
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SSH_FLAGS = [
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'-q', '-o UserKnownHostsFile=/dev/null', '-o "StrictHostKeyChecking no"',
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'-o ServerAliveInterval=10'
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]
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# Shell commands run on target.
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MOUNT_CMD = ('if mountpoint -q /boot ; then umount /boot ; fi ; '
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'mount -t ext4 /dev/block/sda1 /boot')
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REBOOT_CMD = 'nohup reboot > /dev/null 2>&1 &'
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class KernelSwapper(object):
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"""A class that manages swapping a kernel image on a Cloud Android instance.
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Attributes:
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_compute_client: AndroidCopmuteClient object, manages AVD.
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_instance_name: tring, name of Cloud Android Instance.
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_target_ip: string, IP address of Cloud Android instance.
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_ssh_flags: string list, flags to be used with ssh and scp.
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"""
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def __init__(self, cfg, instance_name):
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"""Initialize.
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Args:
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cfg: AcloudConfig object, used to create credentials.
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instance_name: string, instance name.
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"""
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credentials = auth.CreateCredentials(cfg)
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self._compute_client = android_compute_client.AndroidComputeClient(
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cfg, credentials)
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# Name of the Cloud Android instance.
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self._instance_name = instance_name
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# IP of the Cloud Android instance.
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self._target_ip = self._compute_client.GetInstanceIP(instance_name)
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def SwapKernel(self, local_kernel_image):
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"""Swaps the kernel image on target AVD with given kernel.
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Mounts boot image containing the kernel image to the filesystem, then
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overwrites that kernel image with a new kernel image, then reboots the
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Cloud Android instance.
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Args:
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local_kernel_image: string, local path to a kernel image.
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Returns:
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A Report instance.
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"""
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reboot_image = report.Report(command='swap_kernel')
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try:
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self._ShellCmdOnTarget(MOUNT_CMD)
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self.PushFile(local_kernel_image, '/boot')
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self.RebootTarget()
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except subprocess.CalledProcessError as e:
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reboot_image.AddError(str(e))
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reboot_image.SetStatus(report.Status.FAIL)
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return reboot_image
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except errors.DeviceBootError as e:
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reboot_image.AddError(str(e))
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reboot_image.SetStatus(report.Status.BOOT_FAIL)
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return reboot_image
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reboot_image.SetStatus(report.Status.SUCCESS)
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return reboot_image
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def PushFile(self, src_path, dest_path):
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"""Pushes local file to target Cloud Android instance.
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Args:
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src_path: string, local path to file to be pushed.
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dest_path: string, path on target where to push the file to.
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Raises:
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subprocess.CalledProcessError: see _ShellCmd.
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"""
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cmd = 'scp %s %s root@%s:%s' % (' '.join(SSH_FLAGS), src_path,
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self._target_ip, dest_path)
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self._ShellCmd(cmd)
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def RebootTarget(self):
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"""Reboots the target Cloud Android instance and waits for boot.
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Raises:
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subprocess.CalledProcessError: see _ShellCmd.
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errors.DeviceBootError: if target fails to boot.
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"""
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self._ShellCmdOnTarget(REBOOT_CMD)
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self._compute_client.WaitForBoot(self._instance_name)
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def _ShellCmdOnTarget(self, target_cmd):
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"""Runs a shell command on target Cloud Android instance.
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Args:
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target_cmd: string, shell command to be run on target.
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Raises:
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subprocess.CalledProcessError: see _ShellCmd.
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"""
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ssh_cmd = 'ssh %s root@%s' % (' '.join(SSH_FLAGS), self._target_ip)
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host_cmd = ' '.join([ssh_cmd, '"%s"' % target_cmd])
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self._ShellCmd(host_cmd)
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@staticmethod
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def _ShellCmd(host_cmd):
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"""Runs a shell command on host device.
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Args:
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host_cmd: string, shell command to be run on host.
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Raises:
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subprocess.CalledProcessError: For any non-zero return code of
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host_cmd.
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"""
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utils.Retry(
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retry_checker=lambda e: isinstance(e, subprocess.CalledProcessError),
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max_retries=2,
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functor=lambda cmd: subprocess.check_call(cmd, shell=True),
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sleep_multiplier=0,
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retry_backoff_factor=1,
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cmd=host_cmd)
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