diff --git a/mozilla/tools/buildbotcustom/process/factory.py b/mozilla/tools/buildbotcustom/process/factory.py
index 2733c88a191..d191c902a5f 100644
--- a/mozilla/tools/buildbotcustom/process/factory.py
+++ b/mozilla/tools/buildbotcustom/process/factory.py
@@ -1158,9 +1158,10 @@ class ReleaseUpdatesFactory(ReleaseFactory):
          description=['bump', patcherConfig],
          haltOnFailure=True
         )
-        self.addStep(ShellCommand,
+        self.addStep(TinderboxShellCommand,
          command=['cvs', 'diff', '-u', patcherConfigFile],
-         description=['diff', patcherConfig]
+         description=['diff', patcherConfig],
+         ignoreCodes=[1]
         )
         if commitPatcherConfig:
             self.addStep(ShellCommand,
diff --git a/mozilla/tools/buildbotcustom/steps/misc.py b/mozilla/tools/buildbotcustom/steps/misc.py
index db6b44670be..aa8561305b8 100644
--- a/mozilla/tools/buildbotcustom/steps/misc.py
+++ b/mozilla/tools/buildbotcustom/steps/misc.py
@@ -50,12 +50,26 @@ class TinderboxShellCommand(ShellCommand):
     haltOnFailure = False
     
     """This step is really just a 'do not care' buildstep for executing a
-       slave command and ignoring the results.
-       Always returns SUCCESS
+       slave command and ignoring the results. If ignoreCodes is passed,
+       only exit codes listed in it will be ignored. If ignoreCodes is not
+       passed, all exit codes will be ignored.
     """
+    def __init__(self, ignoreCodes=None, **kwargs):
+       ShellCommand.__init__(self, **kwargs)
+       self.ignoreCodes = ignoreCodes
+       self.addFactoryArguments(ignoreCodes=ignoreCodes)
     
     def evaluateCommand(self, cmd):
-       return SUCCESS
+       # Ignore all return codes
+       if not self.ignoreCodes:
+          return SUCCESS
+       else:
+          # Ignore any of the return codes we're told to
+          if cmd.rc in self.ignoreCodes:
+             return SUCCESS
+          # If the return code is something else, fail
+          else:
+             return FAILURE
 
 class GetHgRevision(ShellCommand):
     """Retrieves the revision from a Mercurial repository. Builds based on
diff --git a/mozilla/tools/buildbotcustom/steps/release.py b/mozilla/tools/buildbotcustom/steps/release.py
index d18d13210b6..47f453a2e0e 100644
--- a/mozilla/tools/buildbotcustom/steps/release.py
+++ b/mozilla/tools/buildbotcustom/steps/release.py
@@ -1,6 +1,11 @@
 from buildbot.status.builder import FAILURE, SUCCESS, WARNINGS
 from buildbot.steps.shell import ShellCommand
 
+import buildbotcustom.steps.misc
+reload(buildbotcustom.steps.misc)
+
+from buildbotcustom.steps.misc import TinderboxShellCommand
+
 class UpdateVerify(ShellCommand):
     def evaluateCommand(self, cmd):
         for line in cmd.logs['stdio'].getText().split("\n"):
@@ -9,7 +14,7 @@ class UpdateVerify(ShellCommand):
 
         return SUCCESS
 
-class L10nVerifyMetaDiff(ShellCommand):
+class L10nVerifyMetaDiff(TinderboxShellCommand):
     """Run the l10n verification script.
     """
     name='l10n metadiff'
@@ -28,17 +33,16 @@ class L10nVerifyMetaDiff(ShellCommand):
             self.command=['diff', '-r',
                           '%s/diffs' % currentProduct,
                           '%s/diffs' % previousProduct]
-        ShellCommand.__init__(self, **kwargs)
+        TinderboxShellCommand.__init__(self, ignoreCodes=[0,1], **kwargs)
     
     def evaluateCommand(self, cmd):
-        superResult = ShellCommand.evaluateCommand(self, cmd)
         fileWarnings = self.getProperty('fileWarnings')
         if fileWarnings and len(fileWarnings) > 0:
             return WARNINGS
         '''We ignore failures here on purpose, since diff will 
            return 1(FAILURE) if it actually finds anything to output.
         '''
-        return SUCCESS
+        return TinderboxShellCommand.evaluateCommand(self, cmd)
     
     def createSummary(self, log):
         fileWarnings = []