60 lines
1.5 KiB
Python
60 lines
1.5 KiB
Python
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#!/usr/bin/env python
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import argparse
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import json
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import sys
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def get_hosts(hosts_file='/etc/hosts'):
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'''
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Get the hostsnames from /etc/hosts.
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Returns: A set of hostnames.
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'''
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rv = []
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with open(hosts_file, 'r') as f:
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for line in f:
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if line == '\n':
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continue
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if line[0] == '#':
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continue
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rv.append(line.split()[1])
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rv = set(rv)
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ignore = {'localhost', 'ip6-allnodes', 'ip6-allrouters'}
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return rv.difference(ignore)
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def get_args(args_list):
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"""
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Parse the arguments and make sure only
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that --list or --host is given, not both.
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"""
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parser = argparse.ArgumentParser(
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description='ansible inventory script parsing /etc/hosts')
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mutex_group = parser.add_mutually_exclusive_group(required=True)
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help_list = 'list all hosts from /etc/hosts'
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mutex_group.add_argument('--list', action='store_true', help=help_list)
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help_host = 'display variables for a host'
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mutex_group.add_argument('--host', help=help_host)
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return parser.parse_args(args_list)
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def main(args_list):
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"""
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Print a json list of the hosts if --list is given.
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Does not support host vars.
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Print an empty dictionary if --host is passed to remain valid.
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"""
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args = get_args(args_list)
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if args.list:
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print(json.dumps({
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'all': {
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'hosts': list(get_hosts()),
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}
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}))
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if args.host:
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print(json.dumps({}))
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if __name__ == '__main__':
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main(sys.argv[1:])
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