source: trunk/packages/sipb-xen-base/files/usr/sbin/invirt-getconf @ 757

Last change on this file since 757 was 733, checked in by y_z, 16 years ago

simple initial version of invirt-getconf simply reads & navigates yaml; fixed permissions

  • Property svn:executable set to *
File size: 1.9 KB
Line 
1#!/usr/bin/env python2.5
2
3"""
4invirt-getconf [-f FILE] KEY prints the configuration the option named KEY from
5the invirt configuration file FILE.  Keys are dot-separated paths into the YAML
6configuration tree.  List indexes (0-based) are also treated as path
7components.
8
9(Due to this path language, certain restrictions are placed on the keys used in
10the YAML configuration, e.g. they cannot contain dots.)
11
12Examples:
13
14  invirt-getconf db.uri
15  invirt-getconf authn.0.type
16"""
17
18from invirt.config import load
19from sys import argv, exit, stderr
20from optparse import OptionParser
21
22class invirt_exception( Exception ): pass
23
24def main( argv ):
25    try:
26        parser = OptionParser()
27        parser.add_option('-f', '--file', default = '/etc/invirt/master.yaml',
28                help = 'the configuration file to read from')
29        options, args = parser.parse_args()
30
31        try: [key] = args
32        except: raise invirt_exception( __doc__ )
33
34        conf = load()
35        components = key.split('.')
36        for i, component in enumerate( components ):
37            progress = lambda: '.'.join( components[:i] )
38            if type( conf ) not in [ dict, list ]:
39                raise invirt_exception(
40                        'prematurely arrived at an atomic datum in the tree:\n'
41                        '%s has no children' % progress() )
42            if type( conf ) == list:
43                try: component = int( component )
44                except: raise invirt_exception(
45                        '%s is a list, requires an integral path component '
46                        'but got "%s"' % ( progress(), component ) )
47            try: conf = conf[ component ]
48            except KeyError: raise invirt_exception(
49                    '"%s" not in "%s"' % ( component, progress() ) )
50        print conf
51    except invirt_exception, ex:
52        print >> stderr, ex
53        return 1
54
55if __name__ == '__main__': exit( main( argv ) )
56
57# vim:et:sw=4:ts=4
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