db_lmdb: don't sync a read only DB
This would only throw
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@ -1391,6 +1391,9 @@ void BlockchainLMDB::sync()
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LOG_PRINT_L3("BlockchainLMDB::" << __func__);
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check_open();
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if (is_read_only())
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return;
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// Does nothing unless LMDB environment was opened with MDB_NOSYNC or in part
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// MDB_NOMETASYNC. Force flush to be synchronous.
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if (auto result = mdb_env_sync(m_env, true))
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