setting up CDIST_ALLOW_OVERRIDE to any value is ok - do not depend on true/yes/ja

Signed-off-by: Nico Schottelius <nico@bento.schottelius.org>

cdist/emulator.py

@@ -145,14 +145,14 @@ class Emulator(object):
             if value is not None:
                 self.parameters[key] = value
 
-        if self.cdist_object.exists and os.environ.get('CDIST_ALLOW_OVERRIDE',"false") != 'true':
+        if self.cdist_object.exists and not 'CDIST_ALLOW_OVERRIDE' in os.environ:
             if self.cdist_object.parameters != self.parameters:
                 raise cdist.Error("Object %s already exists with conflicting parameters:\n%s: %s\n%s: %s"
                     % (self.cdist_object.name, " ".join(self.cdist_object.source), self.cdist_object.parameters, self.object_source, self.parameters)
             )
         else:
             if self.cdist_object.exists:
-                self.log.debug('Object %s override forced with CDIST_ALLOW_OVERRIDE=true',self.cdist_object.name)
+                self.log.debug('Object %s override forced with CDIST_ALLOW_OVERRIDE',self.cdist_object.name)
                 self.cdist_object.create(True)
             else:
                 self.cdist_object.create()

docs/changelog

@@ -7,6 +7,7 @@ Changelog
 3.0.5:
 	* Core: Introduce override concept (Daniel Heule)
 	* Type __process: Make --state absent work (Steven Armstrong)
+	* Documentation: Add documentation for influencing variables
 
 
 3.0.4: 2014-01-29

docs/man/man7/cdist-manifest.text

@@ -133,8 +133,8 @@ OVERRIDES
 ---------
 In some special cases, you would like to create an already defined object 
 with different parameters. In normal situations this leads to an error in cdist.
-If you whish, you can mark this second definition of an object with 
-CDIST_ALLOW_OVERRIDE=true to tell cdist, that this object override is 
+If you whish, you can setup the environment variable CDIST_ALLOW_OVERRIDE
+(any value or even empty is ok) to tell cdist, that this object override is 
 wanted and should be accepted.
 ATTENTION: Only use this feature if you are 100% sure in which order 
 cdist encounter the affected objects, otherwhise this results 
@@ -190,7 +190,7 @@ __user foobar --password 'some_fancy_hash' --home /home/foobarexample
 __user foobar --password 'some_other_hash' 
 
 # this tells cdist, that you know that this is an override and should be accepted
-CDIST_ALLOW_OVERRIDE=true __user foobar --password 'some_other_hash'
+CDIST_ALLOW_OVERRIDE=yes __user foobar --password 'some_other_hash'
 # its only an override, means the parameter --home is not touched 
 # and stay at the original value of /home/foobarexample
 --------------------------------------------------------------------------------