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Re: [Qemu-devel] [PATCH v12 1/6] qemu.py: better control of created file
From: |
Eduardo Habkost |
Subject: |
Re: [Qemu-devel] [PATCH v12 1/6] qemu.py: better control of created files |
Date: |
Thu, 1 Feb 2018 18:40:28 -0200 |
User-agent: |
Mutt/1.9.1 (2017-09-22) |
On Mon, Jan 22, 2018 at 09:50:28PM +0100, Amador Pahim wrote:
> To launch a VM, we need to create basically two files: the monitor
> socket (if it's a UNIX socket) and the qemu log file.
>
> For the qemu log file, we currently just open the path, which will
> create the file if it does not exist or overwrite the file if it does
> exist.
>
> For the monitor socket, if it already exists, we are currently removing
> it, even if it's not created by us.
>
> This patch moves to _pre_launch() the responsibility to create a
> temporary directory to host the files so we can remove the whole
> directory on _post_shutdown().
>
> Signed-off-by: Amador Pahim <address@hidden>
> ---
> scripts/qemu.py | 39 +++++++++++++++++++++++++++++----------
> 1 file changed, 29 insertions(+), 10 deletions(-)
>
> diff --git a/scripts/qemu.py b/scripts/qemu.py
> index 9bfdf6d37d..453a67250a 100644
> --- a/scripts/qemu.py
> +++ b/scripts/qemu.py
> @@ -18,6 +18,8 @@ import os
> import sys
> import subprocess
> import qmp.qmp
> +import shutil
> +import tempfile
>
>
> LOG = logging.getLogger(__name__)
> @@ -73,10 +75,11 @@ class QEMUMachine(object):
> wrapper = []
> if name is None:
> name = "qemu-%d" % os.getpid()
> - if monitor_address is None:
> - monitor_address = os.path.join(test_dir, name + "-monitor.sock")
> + self._name = name
> self._monitor_address = monitor_address
> - self._qemu_log_path = os.path.join(test_dir, name + ".log")
> + self._vm_monitor = None
> + self._qemu_log_path = None
> + self._qemu_log_file = None
> self._popen = None
> self._binary = binary
> self._args = list(args) # Force copy args in case we modify them
> @@ -86,6 +89,8 @@ class QEMUMachine(object):
> self._socket_scm_helper = socket_scm_helper
> self._qmp = None
> self._qemu_full_args = None
> + self._test_dir = test_dir
> + self._temp_dir = None
>
> # just in case logging wasn't configured by the main script:
> logging.basicConfig()
> @@ -168,36 +173,50 @@ class QEMUMachine(object):
> self._monitor_address[0],
> self._monitor_address[1])
If _monitor_address now needs to be translated to _vm_monitor,
I'd like to remove all usage of _monitor_address outside
_pre_launch, to avoid confusion between the two attributes.
This can be done in a follow-up patch.
Reviewed-by: Eduardo Habkost <address@hidden>
> else:
> - moncdev = 'socket,id=mon,path=%s' % self._monitor_address
> + moncdev = 'socket,id=mon,path=%s' % self._vm_monitor
> return ['-chardev', moncdev,
> '-mon', 'chardev=mon,mode=control',
> '-display', 'none', '-vga', 'none']
>
> def _pre_launch(self):
> - self._qmp = qmp.qmp.QEMUMonitorProtocol(self._monitor_address,
> + self._temp_dir = tempfile.mkdtemp(dir=self._test_dir)
> + if self._monitor_address is not None:
> + self._vm_monitor = self._monitor_address
> + else:
> + self._vm_monitor = os.path.join(self._temp_dir,
> + self._name + "-monitor.sock")
> + 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,
> server=True)
>
> def _post_launch(self):
> self._qmp.accept()
>
> def _post_shutdown(self):
> - if not isinstance(self._monitor_address, tuple):
> - self._remove_if_exists(self._monitor_address)
> - self._remove_if_exists(self._qemu_log_path)
> + if self._qemu_log_file is not None:
> + self._qemu_log_file.close()
> + self._qemu_log_file = None
> +
> + self._qemu_log_path = None
> +
> + if self._temp_dir is not None:
> + shutil.rmtree(self._temp_dir)
> + self._temp_dir = None
>
> def launch(self):
> '''Launch the VM and establish a QMP connection'''
> self._iolog = None
> self._qemu_full_args = None
> devnull = open(os.path.devnull, 'rb')
> - qemulog = open(self._qemu_log_path, 'wb')
> try:
> self._pre_launch()
> self._qemu_full_args = (self._wrapper + [self._binary] +
> self._base_args() + self._args)
> self._popen = subprocess.Popen(self._qemu_full_args,
> stdin=devnull,
> - stdout=qemulog,
> + stdout=self._qemu_log_file,
> stderr=subprocess.STDOUT,
> shell=False)
> self._post_launch()
> --
> 2.14.3
>
>
--
Eduardo
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