bitbake: tinfoil/data_smart: Allow variable history emit() to function remotely

We can't access the emit() function of varhistory currently as the datastore parameter
isn't handled correctly, nor is the output stream. Add a custom wrapper for this
function which handles the two details correctly.

(Bitbake rev: ba0fa084ccd2b1ade96425d158fd31e49e42f286)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/lib/bb/tinfoil.py

@@ -52,6 +52,10 @@ class TinfoilDataStoreConnectorVarHistory:
     def remoteCommand(self, cmd, *args, **kwargs):
         return self.tinfoil.run_command('dataStoreConnectorVarHistCmd', self.dsindex, cmd, args, kwargs)
 
+    def emit(self, var, oval, val, o, d):
+        ret = self.tinfoil.run_command('dataStoreConnectorVarHistCmdEmit', self.dsindex, var, oval, val, d.dsindex)
+        o.write(ret)
+
     def __getattr__(self, name):
         if not hasattr(bb.data_smart.VariableHistory, name):
             raise AttributeError("VariableHistory has no such method %s" % name)