Introduce a Python module structure

This is a simple move of Python code that wraps common QEMU
functionality, and are used by a number of different tests
and scripts.

By treating that code as a real Python module, we can more easily:
 * reuse code
 * have a proper place for the module's own unittests
 * apply a more consistent style
 * generate documentation

Signed-off-by: Cleber Rosa <crosa@redhat.com>
Reviewed-by: Caio Carrara <ccarrara@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-Id: <20190206162901.19082-2-crosa@redhat.com>
Signed-off-by: Cleber Rosa <crosa@redhat.com>

configure

@@ -7604,6 +7604,7 @@ LINKS="$LINKS pc-bios/qemu-icon.bmp"
 LINKS="$LINKS .gdbinit scripts" # scripts needed by relative path in .gdbinit
 LINKS="$LINKS tests/acceptance tests/data"
 LINKS="$LINKS tests/qemu-iotests/check"
+LINKS="$LINKS python"
 for bios_file in \
     $source_path/pc-bios/*.bin \
     $source_path/pc-bios/*.lid \

python/qemu/__init__.py

@@ -16,12 +16,13 @@ import errno
 import logging
 import os
 import subprocess
-import qmp.qmp
 import re
 import shutil
 import socket
 import tempfile
 
+from . import qmp
+
 
 LOG = logging.getLogger(__name__)
 
@@ -66,7 +67,7 @@ class QEMUMachineAddDeviceError(QEMUMachineError):
     failures reported by the QEMU binary itself.
     """
 
-class MonitorResponseError(qmp.qmp.QMPError):
+class MonitorResponseError(qmp.QMPError):
     """
     Represents erroneous QMP monitor reply
     """
@@ -267,8 +268,8 @@ class QEMUMachine(object):
         self._qemu_log_path = os.path.join(self._temp_dir, self._name + ".log")
         self._qemu_log_file = open(self._qemu_log_path, 'wb')
 
-        self._qmp = qmp.qmp.QEMUMonitorProtocol(self._vm_monitor,
+        self._qmp = qmp.QEMUMonitorProtocol(self._vm_monitor,
-                                                server=True)
+                                            server=True)
 
     def _post_launch(self):
         self._qmp.accept()
@@ -384,7 +385,7 @@ class QEMUMachine(object):
         """
         reply = self.qmp(cmd, conv_keys, **args)
         if reply is None:
-            raise qmp.qmp.QMPError("Monitor is closed")
+            raise qmp.QMPError("Monitor is closed")
         if "error" in reply:
             raise MonitorResponseError(reply)
         return reply["return"]

python/qemu/qtest.py

@@ -13,7 +13,8 @@
 
 import socket
 import os
-import qemu
+
+from . import QEMUMachine
 
 
 class QEMUQtestProtocol(object):
@@ -79,7 +80,7 @@ class QEMUQtestProtocol(object):
         self._sock.settimeout(timeout)
 
 
-class QEMUQtestMachine(qemu.QEMUMachine):
+class QEMUQtestMachine(QEMUMachine):
     '''A QEMU VM'''
 
     def __init__(self, binary, args=None, name=None, test_dir="/var/tmp",

scripts/device-crash-test

@@ -25,6 +25,7 @@ check for crashes and unexpected errors.
 """
 from __future__ import print_function
 
+import os
 import sys
 import glob
 import logging
@@ -34,6 +35,7 @@ import random
 import argparse
 from itertools import chain
 
+sys.path.append(os.path.join(os.path.dirname(__file__), '..', 'python'))
 from qemu import QEMUMachine
 
 logger = logging.getLogger('device-crash-test')

scripts/qmp/qemu-ga-client

@@ -37,10 +37,13 @@
 #
 
 from __future__ import print_function
+import os
+import sys
 import base64
 import random
 
-import qmp
+sys.path.append(os.path.join(os.path.dirname(__file__), '..', '..', 'python'))
+from qemu import qmp
 
 
 class QemuGuestAgent(qmp.QEMUMonitorProtocol):

scripts/qmp/qmp-shell

@@ -66,7 +66,6 @@
 # sent to QEMU, which is useful for debugging and documentation generation.
 
 from __future__ import print_function
-import qmp
 import json
 import ast
 import readline
@@ -76,6 +75,9 @@ import errno
 import atexit
 import shlex
 
+sys.path.append(os.path.join(os.path.dirname(__file__), '..', '..', 'python'))
+from qemu import qmp
+
 class QMPCompleter(list):
     def complete(self, text, state):
         for cmd in self:

scripts/render_block_graph.py

@@ -23,6 +23,8 @@ import sys
 import subprocess
 import json
 from graphviz import Digraph
+
+sys.path.append(os.path.join(os.path.dirname(__file__), '..', 'python'))
 from qemu import MonitorResponseError
 
 

tests/acceptance/avocado_qemu/__init__.py

@@ -13,9 +13,8 @@ import sys
 
 import avocado
 
-SRC_ROOT_DIR = os.path.dirname(os.path.dirname(os.path.dirname(__file__)))
+SRC_ROOT_DIR = os.path.join(os.path.dirname(__file__), '..', '..', '..')
-SRC_ROOT_DIR = os.path.abspath(os.path.dirname(SRC_ROOT_DIR))
+sys.path.append(os.path.join(SRC_ROOT_DIR, 'python'))
-sys.path.append(os.path.join(SRC_ROOT_DIR, 'scripts'))
 
 from qemu import QEMUMachine
 

tests/acceptance/virtio_version.py

@@ -11,7 +11,7 @@ Check compatibility of virtio device types
 import sys
 import os
 
-sys.path.append(os.path.join(os.path.dirname(__file__), "..", "..", "scripts"))
+sys.path.append(os.path.join(os.path.dirname(__file__), '..', '..', 'python'))
 from qemu import QEMUMachine
 from avocado_qemu import Test
 

tests/migration/guestperf/engine.py

@@ -24,13 +24,14 @@ import re
 import sys
 import time
 
-sys.path.append(os.path.join(os.path.dirname(__file__), '..', '..', '..', 'scripts'))
-import qemu
-import qmp.qmp
 from guestperf.progress import Progress, ProgressStats
 from guestperf.report import Report
 from guestperf.timings import TimingRecord, Timings
 
+sys.path.append(os.path.join(os.path.dirname(__file__),
+                             '..', '..', '..', 'python'))
+import qemu
+
 
 class Engine(object):
 

tests/qemu-iotests/235

@@ -23,7 +23,7 @@ import os
 import iotests
 from iotests import qemu_img_create, qemu_io, file_path, log
 
-sys.path.append(os.path.join(os.path.dirname(__file__), '..', '..', 'scripts'))
+sys.path.append(os.path.join(os.path.dirname(__file__), '..', '..', 'python'))
 
 from qemu import QEMUMachine
 

tests/qemu-iotests/238

@@ -23,7 +23,7 @@ import os
 import iotests
 from iotests import log
 
-sys.path.append(os.path.join(os.path.dirname(__file__), '..', '..', 'scripts'))
+sys.path.append(os.path.join(os.path.dirname(__file__), '..', '..', 'python'))
 
 from qemu import QEMUMachine
 

tests/qemu-iotests/iotests.py

@@ -32,8 +32,8 @@ import atexit
 import io
 from collections import OrderedDict
 
-sys.path.append(os.path.join(os.path.dirname(__file__), '..', '..', 'scripts'))
+sys.path.append(os.path.join(os.path.dirname(__file__), '..', '..', 'python'))
-import qtest
+from qemu import qtest
 
 
 # This will not work if arguments contain spaces but is necessary if we

tests/vm/basevm.py

@@ -17,7 +17,7 @@ import sys
 import logging
 import time
 import datetime
-sys.path.append(os.path.join(os.path.dirname(__file__), "..", "..", "scripts"))
+sys.path.append(os.path.join(os.path.dirname(__file__), '..', '..', 'python'))
 from qemu import QEMUMachine, kvm_available
 import subprocess
 import hashlib