set OSC_VERSION environment for source services

will be needed by new obs_scm service

NEWS

@@ -1,5 +1,5 @@
 0.154
-  -
+  - set OSC_VERSION environment for source services
 
 0.153
   - "my sr" is using the server side request collection to get right results

osc/core.py

@@ -381,6 +381,9 @@ class Serviceinfo:
             data = { 'name' : singleservice, 'command' : [ singleservice ], 'mode' : '' }
             allservices = [data]
 
+        # services can detect that they run via osc this way
+        os.putenv("OSC_VERSION", get_osc_version())
+
         # set environment when using OBS 2.3 or later
         if self.project != None:
             os.putenv("OBS_SERVICE_PROJECT", self.project)