Started on clean out strategy, incorporating both size and age

tibi_hardlinks/__init__.py

@@ -36,6 +36,25 @@ def hardlink_all_files(files, dry=False):
             backup.hardlink_to(dest_dir, dry)
 
 
+def clean_out(backups: list[Backup], before_date, target_size):
+    total_size = sum(backup.size for backup in backups)
+    target_removal_size = target_size - total_size
+    if target_removal_size <= 0:
+        return ()
+    backups_eligable = (
+        backup for backup in backups if backup.properties["backup_time"] <= before_date
+    )
+    sorted_backups_eligable = sorted(
+        backups_eligable, key=lambda backup: backup.size, reverse=True
+    )
+    to_remove = list()
+    for backup in sorted_backups_eligable:
+        to_remove.append(backup)
+        target_removal_size -= backup.size
+        if target_removal_size <= 0:
+            return to_remove
+
+
 def main():
     parser = ArgumentParser()
     parser.add_argument("-d", "--dry", action="store_true", help="Don't do anything")

tibi_hardlinks/backups.py

@@ -98,6 +98,13 @@ class Backup:
         self.backup_info = read_backup_properties(property_file)
         self.related_files = find_backup_data(self.property_file, self.backup_info)
 
+    @property
+    def size(self):
+        total = 0
+        for f in self.related_files.values():
+            total += f.stat().st_size
+        return total
+
     def hardlink_to(self, dest_dir, dry):
         for filepath in self.related_files.values():
             if filepath: