def check_output(*popenargs, **kwargs):
r"""Run command with arguments and return its output as a byte string.
If the exit code was non-zero it raises a CalledProcessError. The
CalledProcessError object will have the return code in the returncode
attribute and output in the output attribute.
The arguments are the same as for the Popen constructor. Example:
>>> check_output(["ls", "-l", "/dev/null"])
'crw-rw-rw- 1 root root 1, 3 Oct 18 2007 /dev/null\n'
The stdout argument is not allowed as it is used internally.
To capture standard error in the result, use stderr=STDOUT.
>>> check_output(["/bin/sh", "-c",
... "ls -l non_existent_file ; exit 0"],
... stderr=STDOUT)
'ls: non_existent_file: No such file or directory\n'
"""
if 'stdout' in kwargs:
raise ValueError('stdout argument not allowed, it will be overridden.')
logging.debug(' '.join(popenargs[0]))
process = subprocess.Popen(stdout=subprocess.PIPE, *popenargs, **kwargs)
output, unused_err = process.communicate()
retcode = process.poll()
if retcode:
cmd = kwargs.get("args")
if cmd is None:
cmd = popenargs[0]
raise subprocess.CalledProcessError(retcode, cmd)
return output
def _update_server_options(self, server, key, value):
"""Hack to allow us to make changes to the options used by backends.
A possible better solution would be to have a global config registry.
"""
last = server
applications = []
while (hasattr(last, 'applications')
or hasattr(last, 'application')
or hasattr(last, 'options')):
logging.debug('UPDATE %s: O %s A %s AS %s',
last.__class__,
getattr(last, 'options', None),
getattr(last, 'application', None),
getattr(last, 'applications', None))
if hasattr(last, 'options'):
last.options[key] = value
# NOTE(termie): paste.urlmap.URLMap stores applications in this format
if hasattr(last, 'applications'):
for app in last.applications:
applications.append(app[1])
if hasattr(last, 'application'):
last = last.application
elif len(applications):
last = applications.pop()
else:
break
def import_class(import_str):
"""Returns a class from a string including module and class."""
mod_str, _sep, class_str = import_str.rpartition('.')
try:
__import__(mod_str)
return getattr(sys.modules[mod_str], class_str)
except (ImportError, ValueError, AttributeError), exc:
logging.debug('Inner Exception: %s', exc)
raise
