X-Git-Url: http://xvm.mit.edu/gitweb/invirt/packages/invirt-base.git/blobdiff_plain/a397d9a4ae7892377e47497933aa0ed18667fea2..bed209caf968dd992a7f849f8b982b4b46a0f876:/files/usr/sbin/invirt-getconf

diff --git a/files/usr/sbin/invirt-getconf b/files/usr/sbin/invirt-getconf
index c468499..bb4fd80 100755
--- a/files/usr/sbin/invirt-getconf
+++ b/files/usr/sbin/invirt-getconf
@@ -1,13 +1,14 @@
-#!/usr/bin/env python2.5
+#!/usr/bin/env python
 
 """
-invirt-getconf [-f FILE] KEY prints the configuration the option named KEY from
-the invirt configuration file FILE.  Keys are dot-separated paths into the YAML
+invirt-getconf loads an invirt configuration file (either the original YAML
+source or the faster-to-load JSON cache) and prints the configuration option
+with the given name (key).  Keys are dot-separated paths into the YAML
 configuration tree.  List indexes (0-based) are also treated as path
 components.
 
 (Due to this path language, certain restrictions are placed on the keys used in
-the YAML configuration, e.g. they cannot contain dots.)
+the YAML configuration; e.g., they cannot contain dots.)
 
 Examples:
 
@@ -15,43 +16,79 @@ Examples:
   invirt-getconf authn.0.type
 """
 
-from invirt.config import load
-from sys import argv, exit, stderr
+from invirt.config import default_src_path, default_cache_path, load
+from sys import argv, exit, stderr, stdout
 from optparse import OptionParser
 
-class invirt_exception( Exception ): pass
+class invirt_exception(Exception): pass
 
-def main( argv ):
+def main(argv):
     try:
-        parser = OptionParser()
-        parser.add_option('-f', '--file', default = '/etc/invirt/master.yaml',
-                help = 'the configuration file to read from')
-        options, args = parser.parse_args()
-
-        try: [key] = args
-        except: raise invirt_exception( __doc__ )
-
-        conf = load()
-        components = key.split('.')
-        for i, component in enumerate( components ):
-            progress = lambda: '.'.join( components[:i] )
-            if type( conf ) not in [ dict, list ]:
+        parser = OptionParser(usage = '%prog [options] key',
+                description = __doc__.strip().split('\n\n')[0])
+        parser.add_option('-s', '--src',
+                default = default_src_path,
+                help = 'the source YAML configuration file to read from')
+        parser.add_option('-c', '--cache',
+                default = default_cache_path,
+                help = 'path to the JSON cache')
+        parser.add_option('-r', '--refresh',
+                action = 'store_true',
+                help = 'force the cache to be regenerated')
+        parser.add_option('-l', '--ls',
+                action = 'store_true',
+                help = 'list node\'s children')
+        opts, args = parser.parse_args()
+
+        if len(args) > 1:
+            raise invirt_exception(__doc__.strip())
+        elif args and args[0]:
+            components = args[0].split('.')
+        else:
+            components = []
+
+        conf = load(opts.src, opts.cache, opts.refresh)
+        for i, component in enumerate(components):
+            progress = '.'.join(components[:i])
+            if type(conf) not in (dict, list):
                 raise invirt_exception(
-                        'prematurely arrived at an atomic datum in the tree:\n'
-                        '%s has no children' % progress() )
-            if type( conf ) == list:
-                try: component = int( component )
+                        '%s: node has no children (atomic datum)' % progress)
+            if type(conf) == list:
+                try: component = int(component)
                 except: raise invirt_exception(
-                        '%s is a list, requires an integral path component '
-                        'but got "%s"' % ( progress(), component ) )
-            try: conf = conf[ component ]
+                        '%s: node a list; integer path component required, '
+                        'but got "%s"' % (progress, component))
+            try: conf = conf[component]
             except KeyError: raise invirt_exception(
-                    '"%s" not in "%s"' % ( component, progress() ) )
-        print conf
+                    '%s: key "%s" not found' % (progress, component))
+            except IndexError: raise invirt_exception(
+                    '%s: index %s out of range' % (progress, component))
+
+        if opts.ls:
+            if type(conf) not in (dict, list):
+                raise invirt_exception(
+                        '%s: node has no children (atomic datum)'
+                        % '.'.join(components))
+            if type(conf) == list:
+                for i in xrange(len(conf)):
+                    print i
+            else:
+                for k in conf.iterkeys():
+                    print k
+        else:
+            if type(conf) not in (dict, list):
+                print conf
+            else:
+                import yaml
+                try:    dumper = yaml.CSafeDumper
+                except: dumper = yaml.SafeDumper
+                yaml.dump(conf, stdout,
+                          Dumper = dumper, default_flow_style = False)
     except invirt_exception, ex:
         print >> stderr, ex
         return 1
 
-if __name__ == '__main__': exit( main( argv ) )
+if __name__ == '__main__':
+    exit(main(argv))
 
 # vim:et:sw=4:ts=4