Re-fix merging of source packages

We need complete copies of the SourcePackage objects, as we might later find
some binaries which are only in unstable.

Traceback (most recent call last):
  File "/home/ubuntu-archive/proposed-migration/code/b2/britney.py", line 3290, in <module>
    Britney().main()
  File "/home/ubuntu-archive/proposed-migration/code/b2/britney.py", line 3261, in main
    self.write_excuses()
  File "/home/ubuntu-archive/proposed-migration/code/b2/britney.py", line 1963, in write_excuses
    if should_upgrade_srcarch(pkg, arch, 'unstable'):
  File "/home/ubuntu-archive/proposed-migration/code/b2/britney.py", line 1534, in should_upgrade_srcarch
    False)
  File "/home/ubuntu-archive/proposed-migration/code/b2/britney.py", line 2294, in _compute_groups
    if binaries_t[parch][0][binary].source != source_name:
KeyError: 'kicad'

britney.py

@@ -188,6 +188,7 @@ import os
 import sys
 import time
 import optparse
+import copy
 
 import apt_pkg
 
@@ -1040,9 +1041,11 @@ class Britney(object):
         """Merge sources from `source' into partial suite `target'."""
         source_sources = self.sources[source]
         target_sources = self.sources[target]
+        # we need complete copies here, as we might later find some binaries
+        # which are only in unstable
         for pkg, value in source_sources.items():
             if pkg not in target_sources:
-                target_sources[pkg] = value
+                target_sources[pkg] = copy.deepcopy(value)
 
     def merge_binaries(self, source, target, arch):
         """Merge `arch' binaries from `source' into partial suite `target'."""

tests/test_autopkgtest.py

@@ -873,6 +873,21 @@ class T(TestBase):
         self.assertEqual(self.pending_requests, {})
         self.assertEqual(self.amqp_requests, set())
 
+    def test_same_version_binary_in_unstable(self):
+        '''binary from new architecture in unstable with testing version'''
+
+        # i386 is in testing already, but amd64 just recently built and is in unstable
+        self.data.add_src('brown', False, {'Testsuite': 'autopkgtest'})
+        self.data.add('brown', False, {'Architecture': 'i386'}, add_src=False)
+        self.data.add('brown', True, {'Architecture': 'amd64'}, add_src=False)
+
+        exc = self.do_test(
+            # we need some other package to create unstable Sources
+            [('lightgreen', {'Version': '2'}, 'autopkgtest')],
+            {'brown': (True, {})}
+            )[1]
+        self.assertEqual(exc['brown']['item-name'], 'brown/amd64')
+
     def test_package_pair_running(self):
         '''Two packages in unstable that need to go in together (running)'''