tests/acceptance/avocado_qemu/__init__.py

   1 # Test class and utilities for functional tests
   2 #
   3 # Copyright (c) 2018 Red Hat, Inc.
   4 #
   5 # Author:
   6 #  Cleber Rosa <crosa@redhat.com>
   7 #
   8 # This work is licensed under the terms of the GNU GPL, version 2 or
   9 # later.  See the COPYING file in the top-level directory.
  10
  11 import os
  12 import sys
  13 import uuid
  14
  15 import avocado
  16
  17 SRC_ROOT_DIR = os.path.join(os.path.dirname(__file__), '..', '..', '..')
  18 sys.path.append(os.path.join(SRC_ROOT_DIR, 'python'))
  19
  20 from qemu import QEMUMachine
  21
  22 def is_readable_executable_file(path):
  23     return os.path.isfile(path) and os.access(path, os.R_OK | os.X_OK)
  24
  25
  26 def pick_default_qemu_bin(arch=None):
  27     """
  28     Picks the path of a QEMU binary, starting either in the current working
  29     directory or in the source tree root directory.
  30
  31     :param arch: the arch to use when looking for a QEMU binary (the target
  32                  will match the arch given).  If None (the default), arch
  33                  will be the current host system arch (as given by
  34                  :func:`os.uname`).
  35     :type arch: str
  36     :returns: the path to the default QEMU binary or None if one could not
  37               be found
  38     :rtype: str or None
  39     """
  40     if arch is None:
  41         arch = os.uname()[4]
  42     qemu_bin_relative_path = os.path.join("%s-softmmu" % arch,
  43                                           "qemu-system-%s" % arch)
  44     if is_readable_executable_file(qemu_bin_relative_path):
  45         return qemu_bin_relative_path
  46
  47     qemu_bin_from_src_dir_path = os.path.join(SRC_ROOT_DIR,
  48                                               qemu_bin_relative_path)
  49     if is_readable_executable_file(qemu_bin_from_src_dir_path):
  50         return qemu_bin_from_src_dir_path
  51
  52
  53 class Test(avocado.Test):
  54     def setUp(self):
  55         self._vms = {}
  56         arches = self.tags.get('arch', [])
  57         if len(arches) == 1:
  58             arch = arches.pop()
  59         else:
  60             arch = None
  61         self.arch = self.params.get('arch', default=arch)
  62         default_qemu_bin = pick_default_qemu_bin(arch=self.arch)
  63         self.qemu_bin = self.params.get('qemu_bin',
  64                                         default=default_qemu_bin)
  65         if self.qemu_bin is None:
  66             self.cancel("No QEMU binary defined or found in the source tree")
  67
  68     def _new_vm(self, *args):
  69         vm = QEMUMachine(self.qemu_bin)
  70         if args:
  71             vm.add_args(*args)
  72         return vm
  73
  74     @property
  75     def vm(self):
  76         return self.get_vm(name='default')
  77
  78     def get_vm(self, *args, name=None):
  79         if not name:
  80             name = str(uuid.uuid4())
  81         if self._vms.get(name) is None:
  82             self._vms[name] = self._new_vm(*args)
  83         return self._vms[name]
  84
  85     def tearDown(self):
  86         for vm in self._vms.values():
  87             vm.shutdown()