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Re: [Qemu-devel] [PATCH v6 01/10] qemu.py: Pylint/style fixes
From: |
Cleber Rosa |
Subject: |
Re: [Qemu-devel] [PATCH v6 01/10] qemu.py: Pylint/style fixes |
Date: |
Thu, 24 Aug 2017 18:38:36 -0400 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.2.1 |
On 08/18/2017 10:26 AM, Lukáš Doktor wrote:
> No actual code changes, just several pylint/style fixes and docstring
> clarifications.
>
> Signed-off-by: Lukáš Doktor <address@hidden>
> Reviewed-by: Stefan Hajnoczi <address@hidden>
> ---
> scripts/qemu.py | 73
> +++++++++++++++++++++++++++++++++++++++++++--------------
> 1 file changed, 55 insertions(+), 18 deletions(-)
>
> diff --git a/scripts/qemu.py b/scripts/qemu.py
> index 880e3e8..dd679f1 100644
> --- a/scripts/qemu.py
> +++ b/scripts/qemu.py
> @@ -23,8 +23,22 @@ import qmp.qmp
> class QEMUMachine(object):
> '''A QEMU VM'''
>
> - def __init__(self, binary, args=[], wrapper=[], name=None,
> test_dir="/var/tmp",
> - monitor_address=None, socket_scm_helper=None, debug=False):
> + def __init__(self, binary, args=[], wrapper=[], name=None,
> + test_dir="/var/tmp", monitor_address=None,
> + socket_scm_helper=None, debug=False):
> + '''
> + Initialize a QEMUMachine
> +
> + @param binary: path to the qemu binary
> + @param args: list of extra arguments
> + @param wrapper: list of arguments used as prefix to qemu binary
> + @param name: prefix for socket and log file names (default: qemu-PID)
> + @param test_dir: where to create socket and log file
> + @param monitor_address: address for QMP monitor
> + @param socket_scm_helper: helper program, required for send_fd_scm()"
> + @param debug: enable debug mode
> + @note: Qemu process is not started until launch() is used.
> + '''
> if name is None:
> name = "qemu-%d" % os.getpid()
> if monitor_address is None:
> @@ -33,12 +47,13 @@ class QEMUMachine(object):
> self._qemu_log_path = os.path.join(test_dir, name + ".log")
> self._popen = None
> self._binary = binary
> - self._args = list(args) # Force copy args in case we modify them
> + self._args = list(args) # Force copy args in case we modify them
> self._wrapper = wrapper
> self._events = []
> self._iolog = None
> self._socket_scm_helper = socket_scm_helper
> self._debug = debug
> + self._qmp = None
>
> # This can be used to add an unused monitor instance.
> def add_monitor_telnet(self, ip, port):
> @@ -64,16 +79,16 @@ class QEMUMachine(object):
> if self._socket_scm_helper is None:
> print >>sys.stderr, "No path to socket_scm_helper set"
> return -1
> - if os.path.exists(self._socket_scm_helper) == False:
> + if not os.path.exists(self._socket_scm_helper):
> print >>sys.stderr, "%s does not exist" % self._socket_scm_helper
> return -1
> fd_param = ["%s" % self._socket_scm_helper,
> "%d" % self._qmp.get_sock_fd(),
> "%s" % fd_file_path]
> devnull = open('/dev/null', 'rb')
> - p = subprocess.Popen(fd_param, stdin=devnull, stdout=sys.stdout,
> - stderr=sys.stderr)
> - return p.wait()
> + proc = subprocess.Popen(fd_param, stdin=devnull, stdout=sys.stdout,
> + stderr=sys.stderr)
> + return proc.wait()
>
> @staticmethod
> def _remove_if_exists(path):
> @@ -99,8 +114,8 @@ class QEMUMachine(object):
> return self._popen.pid
>
> def _load_io_log(self):
> - with open(self._qemu_log_path, "r") as fh:
> - self._iolog = fh.read()
> + with open(self._qemu_log_path, "r") as iolog:
> + self._iolog = iolog.read()
>
> def _base_args(self):
> if isinstance(self._monitor_address, tuple):
> @@ -114,7 +129,8 @@ class QEMUMachine(object):
> '-display', 'none', '-vga', 'none']
>
> def _pre_launch(self):
> - self._qmp = qmp.qmp.QEMUMonitorProtocol(self._monitor_address,
> server=True,
> + self._qmp = qmp.qmp.QEMUMonitorProtocol(self._monitor_address,
> + server=True,
> debug=self._debug)
>
> def _post_launch(self):
> @@ -131,9 +147,11 @@ class QEMUMachine(object):
> qemulog = open(self._qemu_log_path, 'wb')
> try:
> self._pre_launch()
> - args = self._wrapper + [self._binary] + self._base_args() +
> self._args
> + args = (self._wrapper + [self._binary] + self._base_args() +
> + self._args)
> self._popen = subprocess.Popen(args, stdin=devnull,
> stdout=qemulog,
> - stderr=subprocess.STDOUT,
> shell=False)
> + stderr=subprocess.STDOUT,
> + shell=False)
> self._post_launch()
> except:
> if self.is_running():
> @@ -154,23 +172,30 @@ class QEMUMachine(object):
>
> exitcode = self._popen.wait()
> if exitcode < 0:
> - sys.stderr.write('qemu received signal %i: %s\n' %
> (-exitcode, ' '.join(self._args)))
> + sys.stderr.write('qemu received signal %i: %s\n'
> + % (-exitcode, ' '.join(self._args)))
> self._load_io_log()
> self._post_shutdown()
>
> underscore_to_dash = string.maketrans('_', '-')
> +
> def qmp(self, cmd, conv_keys=True, **args):
> - '''Invoke a QMP command and return the result dict'''
> + '''Invoke a QMP command and return the response dict'''
> qmp_args = dict()
> - for k in args.keys():
> + for key in args.keys():
> if conv_keys:
> - qmp_args[k.translate(self.underscore_to_dash)] = args[k]
> + qmp_args[key.translate(self.underscore_to_dash)] = args[key]
> else:
> - qmp_args[k] = args[k]
> + qmp_args[key] = args[key]
>
> return self._qmp.cmd(cmd, args=qmp_args)
>
> def command(self, cmd, conv_keys=True, **args):
> + '''
> + Invoke a QMP command.
> + On success return the response dict.
> + On failure raise an exception.
> + '''
> reply = self.qmp(cmd, conv_keys, **args)
> if reply is None:
> raise Exception("Monitor is closed")
> @@ -193,7 +218,15 @@ class QEMUMachine(object):
> return events
>
> def event_wait(self, name, timeout=60.0, match=None):
> - # Test if 'match' is a recursive subset of 'event'
> + '''
> + Wait for specified timeout on named event in QMP; optionally filter
> + results by match.
> +
> + The 'match' is checked to be a recursive subset of the 'event'; skips
> + branch processing on match's value None
> + {"foo": {"bar": 1}} matches {"foo": None}
> + {"foo": {"bar": 1}} does not matches {"foo": {"baz": None}}
> + '''
> def event_match(event, match=None):
> if match is None:
> return True
> @@ -226,4 +259,8 @@ class QEMUMachine(object):
> return None
>
> def get_log(self):
> + '''
> + After self.shutdown or failed qemu execution, this returns the output
> + of the qemu process.
> + '''
> return self._iolog
>
Reviewed-by: Cleber Rosa <address@hidden>
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- [Qemu-devel] [PATCH v6 00/10] qemu.py: Pylint/style fixes, Lukáš Doktor, 2017/08/18
- [Qemu-devel] [PATCH v6 01/10] qemu.py: Pylint/style fixes, Lukáš Doktor, 2017/08/18
- Re: [Qemu-devel] [PATCH v6 01/10] qemu.py: Pylint/style fixes,
Cleber Rosa <=
- [Qemu-devel] [PATCH v6 02/10] qemu|qtest: Avoid dangerous arguments, Lukáš Doktor, 2017/08/18
- [Qemu-devel] [PATCH v6 03/10] qemu.py: Use iteritems rather than keys(), Lukáš Doktor, 2017/08/18
- [Qemu-devel] [PATCH v6 04/10] qemu.py: Simplify QMP key-conversion, Lukáš Doktor, 2017/08/18
- [Qemu-devel] [PATCH v6 05/10] qemu.py: Use custom exceptions rather than Exception, Lukáš Doktor, 2017/08/18
- [Qemu-devel] [PATCH v6 06/10] qmp.py: Couple of pylint/style fixes, Lukáš Doktor, 2017/08/18
- [Qemu-devel] [PATCH v6 07/10] qmp.py: Use object-based class for QEMUMonitorProtocol, Lukáš Doktor, 2017/08/18
- [Qemu-devel] [PATCH v6 08/10] qmp.py: Avoid "has_key" usage, Lukáš Doktor, 2017/08/18