apt/debfile.py: Allow downgrading packages in check() with a parameter

Well, we do not want to allow that in general.

Closes: #613974

1 files changed, 3 insertions, 2 deletions

diff --git a/apt/debfile.py b/apt/debfile.py
index b116a1aa..e9be9672 100644
--- a/apt/debfile.py
+++ b/apt/debfile.py
@@ -481,7 +481,7 @@ class DebPackage(object):
                     return self.VERSION_OUTDATED
         return self.VERSION_NONE
 
-    def check(self):
+    def check(self, allow_downgrade=False):
         """Check if the package is installable."""
         self._dbg(3, "check")
 
@@ -504,7 +504,8 @@ class DebPackage(object):
                 return False
 
         # check version
-        if self.compare_to_version_in_cache() == self.VERSION_OUTDATED:
+        if (not allow_downgrade and
+            self.compare_to_version_in_cache() == self.VERSION_OUTDATED):
             if self._cache[self.pkgname].installed:
                 # the deb is older than the installed
                 self._failure_string = _(