[PATCH] bitbake: print out symmetric difference when comparing sigs

[Matthew McClintock <msm@freescale.com>]

This is useful for really longs lists to pinpoint what has
actually changed

Signed-off-by: Matthew McClintock <msm@freescale.com>
---
 lib/bb/siggen.py |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/lib/bb/siggen.py b/lib/bb/siggen.py
index 9b73c4c..9231291 100644
--- a/lib/bb/siggen.py
+++ b/lib/bb/siggen.py
@@ -251,9 +251,11 @@ def compare_sigfiles(a, b):
 
     if 'basewhitelist' in a_data and a_data['basewhitelist'] != b_data['basewhitelist']:
         print "basewhitelist changed from %s to %s" % (a_data['basewhitelist'], b_data['basewhitelist'])
+        print "changed items: %s" % a_data['basewhitelist'].symmetric_difference(b_data['basewhitelist'])
 
     if 'taskwhitelist' in a_data and a_data['taskwhitelist'] != b_data['taskwhitelist']:
         print "taskwhitelist changed from %s to %s" % (a_data['taskwhitelist'], b_data['taskwhitelist'])
+        print "changed items: %s" % a_data['taskwhitelist'].symmetric_difference(b_data['taskwhitelist'])
 
     if a_data['taskdeps'] != b_data['taskdeps']:
         print "Task dependencies changed from:\n%s\nto:\n%s" % (sorted(a_data['taskdeps']), sorted(b_data['taskdeps']))
@@ -265,6 +267,7 @@ def compare_sigfiles(a, b):
     if changed:
         for dep in changed:
             print "List of dependencies for variable %s changed from %s to %s" % (dep, a_data['gendeps'][dep], b_data['gendeps'][dep])
+            print "changed items: %s" % a_data['gendeps'][dep].symmetric_difference(b_data['gendeps'][dep])
     if added:
         for dep in added:
             print "Dependency on variable %s was added" % (dep)
@@ -293,6 +296,7 @@ def compare_sigfiles(a, b):
                 print "Hash for dependent task %s changed from %s to %s" % (dep, a[dep], b[dep])
     elif 'runtaskdeps' in a_data and 'runtaskdeps' in b_data and sorted(a_data['runtaskdeps']) != sorted(b_data['runtaskdeps']):
         print "Tasks this task depends on changed from %s to %s" % (sorted(a_data['runtaskdeps']), sorted(b_data['runtaskdeps']))
+        print "changed items: %s" % a_data['runtaskdeps'].symmetric_difference(b_data['runtaskdeps'])
 
 def dump_sigfile(a):
     p1 = pickle.Unpickler(file(a, "rb"))
-- 
1.7.6.1