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# -*- coding: utf-8 -*-
"""
Module used for loading multiple json config files, where attributes consequtively over-ride eachother.
"""
#external imports
import os
import json
from collections import OrderedDict
#internal imports
import subuserlib.paths
def filterOutNonExistantPaths(paths):
_paths = []
for path in paths:
if os.path.exists(path):
_paths.append(path)
return _paths
def expandPathInDict(homeDir,pathAttribute,dictionary):
"""
Expand the environment variables in a dictionary of setting-value pairs given that the setting holds a path.
"""
realHome = os.environ["HOME"]
os.environ["HOME"] = homeDir
try:
path = dictionary[pathAttribute]
path = os.path.expandvars(path)
if not "://" in path:
path = os.path.normpath(path)# Norpath because os.path.expandvars is buggy and expands $HOME/foo to /home/user-name//foo
dictionary[pathAttribute] = path
except KeyError:
pass
os.environ["HOME"] = realHome
def expandPathsInDict(homeDir,pathAttributes,dictionary):
for pathAttribute in pathAttributes:
expandPathInDict(homeDir,pathAttribute,dictionary)
def getConfig(configFileHierarchy):
"""
This function is used for loading hierarchical config files in subuser. That is, loading config.json and repositories.json. For more information on config file hierarchies, see the documentation for these two files in the subuser standard:
- `config.json <http://subuser.org/subuser-standard/serializations/config-dot-json-file-format.html>`_
- `repositories.json <http://subuser.org/subuser-standard/serializations/registry/repositories-dot-json-file-format.html>`_
It takes a hierarchy(a list of paths) of config files starting with the config file with the highest precidence and going to the config file with the least precidence.
It returns a dictionary of entries.
"""
configPaths = filterOutNonExistantPaths(configFileHierarchy)
configPaths.reverse()
config = {}
for _configFile in configPaths:
with open(_configFile, 'r') as configFile:
_config = json.load(configFile, object_pairs_hook=OrderedDict)
config.update(_config)
return config
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