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qemu_io.py
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qemu_io.py
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import re
from autotest.client.shared import error
from autotest.client import utils
import utils_misc, aexpect
class QemuIOParamError(Exception):
"""
Parameter Error for qemu-io command
"""
pass
class QemuIO(object):
"""
A class for execute qemu-io command
"""
def __init__(self, test, params, image_name, blkdebug_cfg="",
prompt=r"qemu-io>\s*$", log_filename=None, io_options="",
log_func=None):
self.type = ""
if log_filename:
log_filename += "-" + utils_misc.generate_random_string(4)
self.output_func = utils_misc.log_line
self.output_params = (log_filename,)
else:
self.output_func = None
self.output_params = ()
self.output_prefix = ""
self.prompt=prompt
self.blkdebug_cfg=blkdebug_cfg
self.qemu_io_cmd = utils_misc.get_path(test.bindir,
params.get("qemu_io_binary",
"qemu-io"))
self.io_options = io_options
self.run_command = False
self.image_name = image_name
self.blkdebug_cfg = blkdebug_cfg
self.log_func = log_func
def get_cmd_line(self, ignore_option=[], essential_option=[],
forbid_option=[]):
"""
Generate the command line for qemu-io from the parameters
@params ignore_option: list for the options should not in command
@params essential_option: list for the essential options
@params forbid_option: list for the option should not in command
@return: qemu-io command line
"""
essential_flag = False
qemu_io_cmd = self.qemu_io_cmd
if self.io_options:
for io_option in re.split(",", self.io_options):
if io_option in ignore_option:
pass
elif io_option in forbid_option:
raise QemuIOParamError
else:
if not essential_flag and io_option in essential_option:
essential_flag = True
if len(io_option) == 1:
qemu_io_cmd += " -%s" % io_option
else:
qemu_io_cmd += " --%s" % io_option
if not essential_flag:
raise QemuIOParamError
if self.image_name:
qemu_io_cmd += " "
if self.blkdebug_cfg:
qemu_io_cmd += "blkdebug:%s:" % self.blkdebug_cfg
qemu_io_cmd += self.image_name
return qemu_io_cmd
def cmd_output(self, command):
"""
Run a command in qemu-io
"""
pass
def close(self):
"""
Clean up
"""
pass
class QemuIOShellSession(QemuIO):
"""
Use a shell session to execute qemu-io command
"""
def __init__(self, test, params, image_name, blkdebug_cfg="",
prompt=r"qemu+-io>\s*$", log_filename=None, io_options="",
log_func=None):
QemuIO.__init__(self, test, params, image_name, blkdebug_cfg, prompt,
log_filename, io_options, log_func)
self.type = "shell"
forbid_option = ["h", "help", "V", "version", "c", "cmd"]
self.qemu_io_cmd = self.get_cmd_line(forbid_option=forbid_option)
self.create_session = True
self.session = None
@error.context_aware
def cmd_output(self, command, timeout=60):
"""
Get output from shell session. If the create flag is True, init the
shell session and set the create flag to False.
@param command: command to execute in qemu-io
@param timeout: timeout for execute the command
"""
qemu_io_cmd = self.qemu_io_cmd
prompt = self.prompt
output_func = self.output_func
output_params = self.output_params
output_prefix = self.output_prefix
if self.create_session:
error.context("Running command: %s" % qemu_io_cmd, self.log_func)
self.session = aexpect.ShellSession(qemu_io_cmd, echo=True,
prompt=prompt,
output_func=output_func,
output_params=output_params,
output_prefix=output_prefix)
# Record the command line in log file
if self.output_func:
params = self.output_params + (qemu_io_cmd, )
self.output_func(*params)
self.create_session = False
# Get the reaction from session
self.session.cmd_output("\n")
error.context("Executing command: %s" % command, self.log_func)
return self.session.cmd_output(command, timeout=timeout)
def close(self):
"""
Close the shell session for qemu-io
"""
if not self.create_session:
self.session.close()
class QemuIOSystem(QemuIO):
"""
Run qemu-io with a command line which will return immediately
"""
def __init__(self, test, params, image_name, blkdebug_cfg="",
prompt=r"qemu-io>\s*$", log_filename=None, io_options="",
log_func=None):
QemuIO.__init__(self, test, params, image_name, blkdebug_cfg, prompt,
log_filename, io_options, log_func)
ignore_option = ["c", "cmd"]
essential_option = ["h", "help", "V", "version", "c", "cmd"]
self.qemu_io_cmd = self.get_cmd_line(ignore_option=ignore_option,
essential_option=essential_option)
@error.context_aware
def cmd_output(self, command, timeout=60):
"""
Get output from system_output. Add the command to the qemu-io command
line with -c and record the output in the log file.
@param command: command to execute in qemu-io
@param timeout: timeout for execute the command
"""
qemu_io_cmd = self.qemu_io_cmd
if command:
qemu_io_cmd += " -c '%s'" % command
error.context("Running command: %s" % qemu_io_cmd, self.log_func)
output = utils.system_output(qemu_io_cmd, timeout=timeout)
# Record command line in log file
if self.output_func:
params = self.output_params + (qemu_io_cmd,)
self.output_func(*params)
params = self.output_params + (output,)
self.output_func(*params)
return output
def close(self):
"""
To keep the the same interface with QemuIOShellSession
"""
pass