Current File : //usr/lib/python3.6/site-packages/tuned/profiles/variables.py
import os
import re
import tuned.logs
from .functions import functions as functions
import tuned.consts as consts
from tuned.utils.commands import commands
from tuned.utils.config_parser import ConfigParser, Error
log = tuned.logs.get()
class Variables():
"""
Storage and processing of variables used in profiles
"""
def __init__(self):
self._cmd = commands()
self._lookup_re = {}
self._lookup_env = {}
self._functions = functions.Functions()
def _add_env_prefix(self, s, prefix):
if s.find(prefix) == 0:
return s
return prefix + s
def _check_var(self, variable):
return re.match(r'\w+$',variable)
def add_variable(self, variable, value):
if value is None:
return
s = str(variable)
if not self._check_var(variable):
log.error("variable definition '%s' contains unallowed characters" % variable)
return
v = self.expand(value)
# variables referenced by ${VAR}, $ can be escaped by two $,
# i.e. the following will not expand: $${VAR}
self._lookup_re[r'(?<!\\)\${' + re.escape(s) + r'}'] = v
self._lookup_env[self._add_env_prefix(s, consts.ENV_PREFIX)] = v
def add_from_file(self, filename):
if not os.path.exists(filename):
log.error("unable to find variables_file: '%s'" % filename)
return
try:
config = ConfigParser(delimiters=('='), inline_comment_prefixes=('#'), allow_no_value=True, strict=False)
config.optionxform = str
with open(filename) as f:
config.read_string("[" + consts.MAGIC_HEADER_NAME + "]\n" + f.read(), filename)
except Error:
log.error("error parsing variables_file: '%s'" % filename)
return
for s in config.sections():
for o in config.options(s):
self.add_variable(o, config.get(s, o, raw=True))
def add_from_cfg(self, cfg):
for item in cfg:
if str(item) == "include":
self.add_from_file(os.path.normpath(cfg[item]))
else:
self.add_variable(item, cfg[item])
# expand static variables (no functions)
def expand_static(self, value):
return re.sub(r'\\(\${\w+})', r'\1', self._cmd.multiple_re_replace(self._lookup_re, value))
def expand(self, value):
if value is None:
return None
# expand variables and convert all \${VAR} to ${VAR} (unescape)
s = self.expand_static(str(value))
# expand built-in functions
return self._functions.expand(s)
def get_env(self):
return self._lookup_env
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