Commit d48b47a4 authored by Committed by Łukasz Nowak
updater: Make stateful decision
If at least once certificate has been downloaded from KeDiFa it shall never use again the fall-back, as otherwise it would result with a problem, that next unsuccessful download from KeDiFa would result replacement with fall-back. In order to do so state file is introduced keeping list of overridden certificates. As now there is critical path regarding fetching certificates, the lock is created to avoid concurrent updates.
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