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import os
def getenv(var, val, conv=None):
"""Get a value from the environment, with optional conversion.
@param var name of environment variable
@param val default value
@param conv conversion function to apply to env value
@return converted value or default
"""
try:
v = os.getenv(var)
if v is None:
v = val
else:
print var, '=', v
if conv:
v = conv(v)
except:
v = val
return v
# The following parameters could be placed in a configuration file.
XEND_PID_FILE = '/var/run/xend.pid'
XEND_TRACE_FILE = '/var/log/xend.trace'
XEND_DEBUG_LOG = '/var/log/xend-debug.log'
XEND_USER = 'root'
XEND_DEBUG = getenv("XEND_DEBUG", 0, conv=int)
XEND_DAEMONIZE = getenv("XEND_DAEMONIZE", not XEND_DEBUG, conv=int)
XENSTORED_PID_FILE = '/var/run/xenstored.pid'
XENSTORED_RUN_DIR = '/var/run/xenstored'
XENSTORED_LIB_DIR = '/var/lib/xenstored'
XENSTORED_DEBUG = getenv("XENSTORED_DEBUG", 0, conv=int)
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