pytest: don't copy db to query it.

Should be safe to do in-place.

Signed-off-by: Rusty Russell <[email protected]>

tests/db.py

@@ -24,13 +24,12 @@ def get_dsn(self):
         return None
 
     def query(self, query):
-        orig = os.path.join(self.path)
-        copy = self.path + ".copy"
-        shutil.copyfile(orig, copy)
-        db = sqlite3.connect(copy)
+        db = sqlite3.connect(self.path)
 
         db.row_factory = sqlite3.Row
         c = db.cursor()
+        # Don't get upset by concurrent writes; wait for up to 5 seconds!
+        c.execute("PRAGMA busy_timeout = 5000");
         c.execute(query)
         rows = c.fetchall()