Download .spec and .changes file only for now

lib/db_revision.py

@@ -1,5 +1,6 @@
 from hashlib import md5
 
+from lib.db import DB
 from lib.request import Request
 
 
@@ -202,6 +203,24 @@ class DBRevision:
         self._files.sort(key=lambda x: x["name"])
         return self._files
 
+    def calc_delta(self, db: DB, current_rev=None):
+        """Calculate the list of files to download and to delete"""
+        old_files = dict()
+        to_download = []
+        to_delete = []
+        if current_rev:
+            for entry in current_rev.files_list(db):
+                old_files[entry["name"]] = f"{entry['md5']}-{entry['size']}"
+        for entry in self.files_list(db):
+            if old_files.get(entry["name"], "") != f"{entry['md5']}-{entry['size']}":
+                print("Download", entry["name"])
+                to_download.append(entry["name"])
+            old_files.pop(entry["name"], None)
+        for entry in old_files.keys():
+            print("Delete", entry)
+            to_delete.append(entry)
+        return to_download, to_delete
+
     @staticmethod
     def requests_to_fetch(db):
         with db.cursor() as cur: