Implement a fileshash function for revision

lib/db_revision.py

@@ -1,3 +1,5 @@
+from hashlib import md5
+
 from lib.request import Request
 
 
@@ -19,6 +21,7 @@ class DBRevision:
             self.request_id,
         ) = row
         self.rev = int(self.rev)
+        self._files = None
 
     def __str__(self):
         return f"Rev {self.project}/{self.rev} Md5 {self.unexpanded_srcmd5} {self.commit_time} {self.userid} {self.request_number}"
@@ -156,14 +159,31 @@ class DBRevision:
                     ),
                 )
 
+    def fileshash(self, db):
+        m = md5()
+        for file_dict in self.files_list(db):
+            m.update(
+                (
+                    file_dict["name"]
+                    + "/"
+                    + file_dict["md5"]
+                    + "/"
+                    + str(file_dict["size"])
+                ).encode("utf-8")
+            )
+        return m.hexdigest()
+
     def files_list(self, db):
+        if self._files:
+            return self._files
         cur = db.cursor()
         cur.execute("SELECT * from files where revision_id=%s", (self.dbid,))
-        ret = []
+        self._files = []
         for row in cur.fetchall():
             (_, _, name, md5, size, mtime) = row
-            ret.append({"md5": md5, "size": size, "mtime": mtime, "name": name})
-        return ret
+            self._files.append({"md5": md5, "size": size, "mtime": mtime, "name": name})
+        self._files.sort(key=lambda x: x["name"])
+        return self._files
 
     @staticmethod
     def requests_to_fetch(self, db, project, package):