rabbit_db: Skip reset if the node is already virgin #14768
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Why
If we run
resetagain on an already virgin node, it will take decisions based on the wrong state. In particular, the previous use of Khepri or Mnesia is lost with the first reset. Therefore, the second reset wolud delete non-Khepri related files that belong to the coordination Ra system.This is particularily problematic with the previously documented way of joining two nodes using the CLI:
rabbitmqctl stop_app rabbitmqctl reset rabbitmqctl join_cluster $REMOTE_NODE rabbitmqctl start_appIndeed,
join_clusterimplies a reset. If the admin already reset the node as documented,join_clusterimplied reset would delete too many files, breaking Khepri after the join if Khepri is used by the remote node.How
In
rabbit_db:reset/0, we skip the reset if the node is already virgin.Fixes #14748.