update: list_files to copy all DHCP_CONFS..
#!/usr/bin/env python
# vim: set ft=python :
"""
Process zonefiles with template expansions.
"""
__version__ = '0.0.1-dev'
import optparse
import codecs
import os.path
from datetime import datetime
import logging
log = logging.getLogger()
# command-line options, global state
options = None
def parse_options (argv) :
"""
Parse command-line arguments.
"""
parser = optparse.OptionParser(
prog = argv[0],
usage = '%prog: [options]',
version = __version__,
# module docstring
description = __doc__,
)
# logging
general = optparse.OptionGroup(parser, "General Options")
general.add_option('-q', '--quiet', dest='loglevel', action='store_const', const=logging.ERROR, help="Less output")
general.add_option('-v', '--verbose', dest='loglevel', action='store_const', const=logging.INFO, help="More output")
general.add_option('-D', '--debug', dest='loglevel', action='store_const', const=logging.DEBUG, help="Even more output")
parser.add_option_group(general)
parser.add_option('-c', '--input-charset', metavar='CHARSET', default='utf-8',
help="Encoding used for input files")
parser.add_option('-o', '--output', metavar='FILE', default='-',
help="Write to output file; default stdout")
parser.add_option('--output-charset', metavar='CHARSET', default='utf-8',
help="Encoding used for output files")
parser.add_option('--expand', metavar='NAME=VALUE', action='append',
help="Expand given template variable in zone")
parser.add_option('--serial', metavar='FILE',
help="Read/expand serial from given .serial file")
# defaults
parser.set_defaults(
loglevel = logging.WARN,
expand = [],
)
# parse
options, args = parser.parse_args(argv[1:])
# configure
logging.basicConfig(
format = '%(processName)s: %(name)s: %(levelname)s %(funcName)s : %(message)s',
level = options.loglevel,
)
return options, args
def process_file (file, expansions) :
"""
Process file, expanding lines.
"""
for line in file :
line = line.format(**expansions)
yield line
def write_lines (file, lines, suffix='\n') :
for line in lines :
file.write(line + suffix)
def open_file (path, mode, charset) :
"""
Open unicode-enabled file from path, with - using stdio.
"""
if path == '-' :
# use stdin/out based on mode
stream, func = {
'r': (sys.stdin, codecs.getreader),
'w': (sys.stdout, codecs.getwriter),
}[mode[0]]
# wrap
return func(charset)(stream)
else :
# open
return codecs.open(path, mode, charset)
def process_serial (path) :
"""
Use serial number from given file.
Returns the new serial as a string.
"""
if not os.path.exists(path) :
raise Exception("Given --serial does not exist: %s" % path)
return open(path).read().strip()
def parse_expand (expand) :
"""
Parse an --expand foo=bar to (key, value)
"""
key, value = expand.split('=', 1)
return key, value
def main (argv) :
global options
options, args = parse_options(argv)
# expands
expand = dict(parse_expand(expand) for expand in options.expand)
# serial?
if options.serial :
serial = process_serial(options.serial)
expand['serial'] = serial
# input
if args :
# open files
input_files = [open_file(path, 'r', options.input_charset) for path in args]
else :
# default to stdout
input_files = [open_file('-', 'r', options.input_charset)]
# process
lines = []
for file in input_files :
log.info("Reading zone: %s", file)
lines += list(process_file(file, expand))
# output
output = open_file(options.output, 'w', options.output_charset)
write_lines(output, lines, suffix='')
return 0
if __name__ == '__main__':
import sys
sys.exit(main(sys.argv))