[damned-lies] Add method to hard reset a module repository

[Claude Paroz <claudep src gnome org>]

commit b0e61b1fcfabf884e390eb95cd305aeab0b3ca32
Author: Claude Paroz <claude 2xlibre net>
Date:   Sat Nov 21 11:10:57 2020 +0100

    Add method to hard reset a module repository

 stats/models.py | 10 ++++++++++
 1 file changed, 10 insertions(+)
---
diff --git a/stats/models.py b/stats/models.py
index 9620cae6..9c88e459 100644
--- a/stats/models.py
+++ b/stats/models.py
@@ -168,6 +168,16 @@ class Module(models.Model):
             return True
         return False
 
+    def reset_hard(self):
+        """Remove all module checkouts and re-create them."""
+        branches = self.get_branches()
+        for branch in branches:
+            path = branch.co_path
+            if path.exists():
+                shutil.rmtree(path)
+        for branch in branches:
+            branch._repo.init_checkout()
+
 
 class ModuleLock:
     """ Weird things happen when multiple updates run in parallel for the same module