[qa] Delete cookie file before starting node

If a cookie file exists in a datadir prior to node startup, it must have
been leftover from a prior unclean shutdown. As bitcoind will overwrite
it anyway, delete it before starting up to prevent the test framework
from inadvertently trying to connect using stale credentials.

1 files changed, 6 insertions, 0 deletions

diff --git a/test/functional/test_framework/util.py b/test/functional/test_framework/util.py
index a24a2ec4f5..f22322fbbc 100644
--- a/test/functional/test_framework/util.py
+++ b/test/functional/test_framework/util.py
@@ -332,6 +332,12 @@ def get_auth_cookie(datadir):
         raise ValueError("No RPC credentials")
     return user, password
 
+# If a cookie file exists in the given datadir, delete it.
+def delete_cookie_file(datadir):
+    if os.path.isfile(os.path.join(datadir, "regtest", ".cookie")):
+        logger.debug("Deleting leftover cookie file")
+        os.remove(os.path.join(datadir, "regtest", ".cookie"))
+
 def get_bip9_status(node, key):
     info = node.getblockchaininfo()
     return info['bip9_softforks'][key]