| 1 | #!/usr/bin/env python |
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| 2 | |
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| 3 | """ |
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| 4 | invirt-getconf loads an invirt configuration file (either the original YAML |
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| 5 | source or the faster-to-load JSON cache) and prints the configuration option |
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| 6 | with the given name (key). Keys are dot-separated paths into the YAML |
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| 7 | configuration tree. List indexes (0-based) are also treated as path |
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| 8 | components. |
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| 9 | |
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| 10 | (Due to this path language, certain restrictions are placed on the keys used in |
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| 11 | the YAML configuration; e.g., they cannot contain dots.) |
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| 12 | |
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| 13 | Examples: |
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| 14 | |
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| 15 | invirt-getconf db.uri |
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| 16 | invirt-getconf authn.0.type |
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| 17 | """ |
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| 18 | |
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| 19 | from invirt.config import load |
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| 20 | from sys import argv, exit, stderr, stdout |
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| 21 | from optparse import OptionParser |
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| 22 | |
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| 23 | class invirt_exception(Exception): pass |
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| 24 | |
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| 25 | def main(argv): |
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| 26 | try: |
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| 27 | parser = OptionParser(usage = '%prog [options] key', |
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| 28 | description = __doc__.strip().split('\n\n')[0]) |
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| 29 | parser.add_option('-s', '--src', |
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| 30 | default = '/etc/invirt/master.yaml', |
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| 31 | help = 'the source YAML configuration file to read from') |
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| 32 | parser.add_option('-c', '--cache', |
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| 33 | default = '/var/lib/invirt/invirt.json', |
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| 34 | help = 'path to the JSON cache') |
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| 35 | parser.add_option('-r', '--refresh', |
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| 36 | action = 'store_true', |
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| 37 | help = 'force the cache to be regenerated') |
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| 38 | parser.add_option('-l', '--ls', |
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| 39 | action = 'store_true', |
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| 40 | help = 'list node\'s children') |
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| 41 | opts, args = parser.parse_args() |
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| 42 | |
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| 43 | if len(args) > 1: |
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| 44 | raise invirt_exception(__doc__.strip()) |
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| 45 | elif args and args[0]: |
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| 46 | components = args[0].split('.') |
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| 47 | else: |
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| 48 | components = [] |
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| 49 | |
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| 50 | conf = load(opts.src, opts.cache, opts.refresh) |
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| 51 | for i, component in enumerate(components): |
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| 52 | progress = '.'.join(components[:i]) |
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| 53 | if type(conf) not in (dict, list): |
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| 54 | raise invirt_exception( |
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| 55 | '%s: node has no children (atomic datum)' % progress) |
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| 56 | if type(conf) == list: |
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| 57 | try: component = int(component) |
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| 58 | except: raise invirt_exception( |
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| 59 | '%s: node a list; integer path component required, ' |
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| 60 | 'but got "%s"' % (progress, component)) |
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| 61 | try: conf = conf[component] |
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| 62 | except KeyError: raise invirt_exception( |
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| 63 | '%s: key "%s" not found' % (progress, component)) |
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| 64 | except IndexError: raise invirt_exception( |
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| 65 | '%s: index %s out of range' % (progress, component)) |
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| 66 | |
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| 67 | if opts.ls: |
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| 68 | if type(conf) not in (dict, list): |
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| 69 | raise invirt_exception( |
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| 70 | '%s: node has no children (atomic datum)' |
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| 71 | % '.'.join(components)) |
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| 72 | if type(conf) == list: |
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| 73 | for i in xrange(len(conf)): |
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| 74 | print i |
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| 75 | else: |
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| 76 | for k in conf.iterkeys(): |
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| 77 | print k |
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| 78 | else: |
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| 79 | if type(conf) not in (dict, list): |
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| 80 | print conf |
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| 81 | else: |
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| 82 | import yaml |
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| 83 | yaml.dump(conf, stdout, |
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| 84 | Dumper=yaml.CSafeDumper, default_flow_style=False) |
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| 85 | except invirt_exception, ex: |
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| 86 | print >> stderr, ex |
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| 87 | return 1 |
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| 88 | |
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| 89 | if __name__ == '__main__': |
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| 90 | exit(main(argv)) |
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| 91 | |
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| 92 | # vim:et:sw=4:ts=4 |
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