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#!/usr/bin/env python
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#
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# Copyright (c) 2012 Cabo A/S
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# All rights reserved.
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#
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# Written by Dan Villiom Podlaski Christiansen <dan@cabo.dk>
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#
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'''
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Script and module for updating or combining a configuration file with
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changes in a template.
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'''
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import itertools
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import os
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import sys
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import configobj
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def _readfile(path):
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''' read the entire contents of 'path'. Equivalent to:
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>>> open(path).read()
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but without relying on reference counting to immediately close the file.
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'''
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with open(path) as fd:
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return fd.read()
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def _removedups(lst):
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'''
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Return a copy of the list with all duplicates removed
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http://stackoverflow.com/a/6197827/136864
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'''
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dset = set()
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# relies on the fact that dset.add() always returns None.
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return [ l for l in lst if
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l not in dset and not dset.add(l) ]
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def combineconfig(config, template):
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'''
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update the given config with new entries (and comments) from the
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template
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'''
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template = configobj.ConfigObj(template.splitlines())
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try:
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config = configobj.ConfigObj(config.splitlines(), raise_errors=True)
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except configobj.DuplicateError:
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config = \
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configobj.ConfigObj(_removedups(config.splitlines()))
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for key, value in config.items():
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if key not in template:
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template[key] = value
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template.comments[key] = config.comments[key] or ['']
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template.comments[key].append('# UNUSED!')
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else:
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template[key] = value
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if not template.comments[key] and any(config.comments[key]):
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template.comments[key] = config.comments[key]
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return template
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def main(args):
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'''main entry point'''
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try:
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if len(args) != 3 and len(args) != 4:
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sys.stderr.write('usage: %s <config> <template> [dest]\n' %
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os.path.basename(args[0]))
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return 1
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configpath = args[1]
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templatepath = args[2]
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config = combineconfig(_readfile(configpath), _readfile(templatepath))
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if len(args) == 4:
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with open(args[3], 'w') as outfd:
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config.write(outfd)
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else:
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config.write(sys.stdout)
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return 0
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except Exception as e:
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import traceback
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traceback.print_exc()
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return 1
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if __name__ == '__main__':
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sys.exit(main(sys.argv))
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