vtysh: track and fix file-lock use in the workaround from 2004

There's a workaround in the code from a bug from back in 2004, it ends
and re-enters config mode anytime an `exit` is done from a level below
the top-level config node (e.g., from a `router isis` node). We need to
re-enter config mode with or without a lock according to how we actually
entered it to begin with.

fixes #13920

Signed-off-by: Christian Hopps <chopps@labn.net>

1 files changed, 4 insertions, 0 deletions

diff --git a/lib/vty.h b/lib/vty.h
index ac3d2e5019..a8654f8b69 100644
--- a/lib/vty.h
+++ b/lib/vty.h
@@ -231,6 +231,10 @@ struct vty {
 	const char *mgmt_req_pending_cmd;
 	bool mgmt_locked_candidate_ds;
 	bool mgmt_locked_running_ds;
+	/* Need to track when we file-lock in vtysh to re-lock on end/conf t
+	 * workaround
+	 */
+	bool vtysh_file_locked;
 };
 
 static inline void vty_push_context(struct vty *vty, int node, uint64_t id)