def _simple_exec_cmd(command,
env=None,
nice=None,
ioclass=None,
stdin=None,
stdout=None,
stderr=None):
command = cmdutils.wrap_command(command,
with_ioclass=ioclass,
ioclassdata=None,
with_nice=nice,
with_setsid=False,
with_sudo=False,
reset_cpu_affinity=True)
logging.debug(cmdutils.command_log_line(command, cwd=None))
p = CPopen(command,
close_fds=True,
cwd=None,
env=env,
stdin=stdin,
stdout=stdout,
stderr=stderr)
return p
def _start_process(self):
"""
Starts a dd process performing direct I/O to path, reading the process
stderr. When stderr has closed, _read_completed will be called.
"""
cmd = [constants.EXT_DD, "if=%s" % self._path, "of=/dev/null",
"bs=4096", "count=1", "iflag=direct"]
cmd = cmdutils.wrap_command(cmd)
self._proc = CPopen(cmd, stdin=None, stdout=None,
stderr=subprocess.PIPE)
self._reader = self._loop.create_dispatcher(
asyncevent.BufferedReader, self._proc.stderr, self._read_completed)
