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#!/usr/bin/env python
# -*- coding: utf-8 -*-
# Started 30/05/2011 by Seblu <seblu@seblu.net>
'''
InstallSystems Configuration files class
'''
import os
from ConfigParser import RawConfigParser
from installsystems.printer import *
class ConfigFile(object):
'''Configuration class'''
def __init__(self, prefix=None, filename=None):
# prefix is config file indentifier (isinstall / isrepo)
self.prefix = prefix
self.path = self._config_path() if filename is None else os.path.abspath(filename)
self.reload()
def _config_path(self):
'''Return path of the best config file'''
for cf in [ os.path.join(os.path.expanduser("~/.config/installsystems/%s.conf" % self.prefix)),
"/etc/installsystems/%s.conf" % self.prefix ]:
if (os.path.exists(cf) and os.path.isfile(cf) and os.access(cf, os.R_OK)):
return cf
return None
def reload(self):
'''Load/Reload config file'''
# seting default config
self._config = {}
self._repos = {}
# loading config file if exists
if self.path is not None:
debug("Loading config file: %s" % self.path)
try:
cp = RawConfigParser()
cp.read(self.path)
if cp.has_section(self.prefix):
self._config = dict(cp.items(self.prefix))
cp.remove_section(self.prefix)
for rep in cp.sections():
img = data = None
if cp.has_option(rep, "image"):
img = cp.get(rep, "image")
if cp.has_option(rep, "data"):
data = cp.get(rep, "data")
self._repos[rep]= (img, data)
except Exception as e:
raise Exception("Unable load file %s: %s" % (self.path, e))
else:
debug("No config file found")
def _cache_paths(self):
'''List all candidates to cache directories. Alive or not'''
dirs = ["/var/tmp", "/tmp"]
# we have a different behaviour if we are root
dirs.insert(0, "/var/cache" if os.getuid() == 0 else os.path.expanduser("~/.cache"))
return map(lambda x: os.path.join(x, self.prefix), dirs)
def _cache_path(self):
'''Return path of the best cache directory'''
# find a good directory
for di in self._cache_paths():
if (os.path.exists(di)
and os.path.isdir(di)
and os.access(di, os.R_OK|os.W_OK|os.X_OK)):
return di
return None
@property
def cache(self):
'''Find a cache directory'''
if "cache" in self._config:
return self._config["cache"]
if self._cache_path() is None:
for di in self._cache_paths():
try:
os.mkdir(di)
break
except Exception as e:
debug("Unable to create %s: %s" % (di, e))
return self._cache_path()
@property
def repos(self):
'''Get a list of repository available'''
for r in self._repos:
yield (r, self._repos[r][0], self._repos[r][1])
def repo(self, name):
'''
Return a reposiory by its name
name can be None if there is only one repository
'''
if name is None and len(self._repos) == 1:
return self._repos[self._repos.keys()[0]]
elif name is not None:
if name in self._repos.keys():
return self._repos[name]
return None