added system error code for failed install due to build already present

pym/install/variables/distr.py

@@ -21,7 +21,7 @@ import re
 import operator
 from operator import itemgetter
 from calculate.lib.datavars import (Variable, VariableError, ReadonlyVariable,
-                                    CommonVariableError)
+                                    CommonVariableError, BuildAlreadyInstalledError)
 from calculate.lib.utils.common import (getSupportArch, getTupleVersion,
                                         cmpVersion, cmp)
 from calculate.lib.utils.files import listDirectory, pathJoin
@@ -39,6 +39,7 @@ from functools import reduce, cmp_to_key
 setLocalTranslate('cl_install3', sys.modules[__name__])
 
 
+
 class DistroRepository(Linux):
     contentCache = {}
 
@@ -632,10 +633,13 @@ class VariableClImageNewOnly(Variable):
             except Exception as e:
                 raise VariableError(_("Wrong image file"))
             if imageData.get('os_linux_build', '') <= \
-                    self.Get('os_linux_build') or \
-                            imageData.get('os_linux_build',
-                                          '') <= self.installedBuild():
+                    self.Get('os_linux_build'): #or \
+                            # imageData.get('os_linux_build',
+                                        #   '') <= self.installedBuild():
                 raise CommonVariableError(_("The image for update not found"))
+            if imageData.get('os_linux_build', '') <= self.installedBuild():
+                raise BuildAlreadyInstalledError(_("Build already installed"))
+            
 
 
 class VariableClInstallPathFrom(ReadonlyVariable):