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# Functional test that boots a Linux kernel and checks the console
#
# Copyright (c) 2018 Red Hat, Inc.
#
# Author:
#  Cleber Rosa <crosa@redhat.com>
#
# This work is licensed under the terms of the GNU GPL, version 2 or
# later.  See the COPYING file in the top-level directory.

import os
import shutil

from avocado_qemu import QemuSystemTest
from avocado_qemu import wait_for_console_pattern
from avocado.utils import process
from avocado.utils import archive

class LinuxKernelTest(QemuSystemTest):
    KERNEL_COMMON_COMMAND_LINE = 'printk.time=0 '

    def wait_for_console_pattern(self, success_message, vm=None):
        wait_for_console_pattern(self, success_message,
                                 failure_message='Kernel panic - not syncing',
                                 vm=vm)

    def extract_from_deb(self, deb, path):
        """
        Extracts a file from a deb package into the test workdir

        :param deb: path to the deb archive
        :param path: path within the deb archive of the file to be extracted
        :returns: path of the extracted file
        """
        cwd = os.getcwd()
        os.chdir(self.workdir)
        file_path = process.run("ar t %s" % deb).stdout_text.split()[2]
        process.run("ar x %s %s" % (deb, file_path))
        archive.extract(file_path, self.workdir)
        os.chdir(cwd)
        # Return complete path to extracted file.  Because callers to
        # extract_from_deb() specify 'path' with a leading slash, it is
        # necessary to use os.path.relpath() as otherwise os.path.join()
        # interprets it as an absolute path and drops the self.workdir part.
        return os.path.normpath(os.path.join(self.workdir,
                                             os.path.relpath(path, '/')))

    def extract_from_rpm(self, rpm, path):
        """
        Extracts a file from an RPM package into the test workdir.

        :param rpm: path to the rpm archive
        :param path: path within the rpm archive of the file to be extracted
                     needs to be a relative path (starting with './') because
                     cpio(1), which is used to extract the file, expects that.
        :returns: path of the extracted file
        """
        cwd = os.getcwd()
        os.chdir(self.workdir)
        process.run("rpm2cpio %s | cpio -id %s" % (rpm, path), shell=True)
        os.chdir(cwd)
        return os.path.normpath(os.path.join(self.workdir, path))