blockchain_import: Add --drop-hard-fork command

src/blockchain_db/berkeleydb/db_bdb.cpp

@@ -2192,6 +2192,11 @@ void BlockchainBDB::check_hard_fork_info()
 	/* FIXME: Some other time */
 }
 
+void BlockchainBDB::drop_hard_fork_info()
+{
+  /* TODO */
+}
+
 void BlockchainBDB::set_hard_fork_version(uint64_t height, uint8_t version)
 {
     LOG_PRINT_L3("BlockchainBDB::" << __func__);

src/blockchain_db/berkeleydb/db_bdb.h

@@ -376,6 +376,7 @@ private:
   virtual void set_hard_fork_version(uint64_t height, uint8_t version);
   virtual uint8_t get_hard_fork_version(uint64_t height) const;
   virtual void check_hard_fork_info();
+  virtual void drop_hard_fork_info();
 
   /**
    * @brief convert a tx output to a blob for storage

src/blockchain_db/blockchain_db.h

@@ -503,6 +503,7 @@ public:
   virtual void set_hard_fork_version(uint64_t height, uint8_t version) = 0;
   virtual uint8_t get_hard_fork_version(uint64_t height) const = 0;
   virtual void check_hard_fork_info() = 0;
+  virtual void drop_hard_fork_info() = 0;
 
   virtual bool is_read_only() const = 0;
 

src/blockchain_db/lmdb/db_lmdb.cpp

@@ -2457,6 +2457,19 @@ void BlockchainLMDB::check_hard_fork_info()
   TXN_POSTFIX_SUCCESS();
 }
 
+void BlockchainLMDB::drop_hard_fork_info()
+{
+  LOG_PRINT_L3("BlockchainLMDB::" << __func__);
+  check_open();
+
+  TXN_PREFIX(0);
+
+  mdb_drop(*txn_ptr, m_hf_starting_heights, 1);
+  mdb_drop(*txn_ptr, m_hf_versions, 1);
+
+  TXN_POSTFIX_SUCCESS();
+}
+
 void BlockchainLMDB::set_hard_fork_starting_height(uint8_t version, uint64_t height)
 {
   LOG_PRINT_L3("BlockchainLMDB::" << __func__);

src/blockchain_db/lmdb/db_lmdb.h

@@ -236,6 +236,7 @@ private:
   virtual void set_hard_fork_version(uint64_t height, uint8_t version);
   virtual uint8_t get_hard_fork_version(uint64_t height) const;
   virtual void check_hard_fork_info();
+  virtual void drop_hard_fork_info();
 
   /**
    * @brief convert a tx output to a blob for storage

src/blockchain_utilities/blockchain_import.cpp

@@ -557,6 +557,7 @@ int main(int argc, char* argv[])
   const command_line::arg_descriptor<uint64_t> arg_block_stop  = {"block-stop", "Stop at block number", block_stop};
   const command_line::arg_descriptor<uint64_t> arg_batch_size  = {"batch-size", "", db_batch_size};
   const command_line::arg_descriptor<uint64_t> arg_pop_blocks  = {"pop-blocks", "Remove blocks from end of blockchain", num_blocks};
+  const command_line::arg_descriptor<bool>        arg_drop_hf  = {"drop-hard-fork", "Drop hard fork subdbs", false};
   const command_line::arg_descriptor<bool>     arg_testnet_on  = {
     "testnet"
       , "Run on testnet."
@@ -589,6 +590,7 @@ int main(int argc, char* argv[])
 
   command_line::add_arg(desc_cmd_only, arg_count_blocks);
   command_line::add_arg(desc_cmd_only, arg_pop_blocks);
+  command_line::add_arg(desc_cmd_only, arg_drop_hf);
   command_line::add_arg(desc_cmd_only, command_line::arg_help);
 
   // call add_options() directly for these arguments since
@@ -761,6 +763,15 @@ int main(int argc, char* argv[])
     return 0;
   }
 
+#if !defined(BLOCKCHAIN_DB) || (BLOCKCHAIN_DB == DB_LMDB)
+  if (! vm["drop-hard-fork"].defaulted())
+  {
+    LOG_PRINT_L0("Dropping hard fork tables...");
+    simple_core.m_storage.get_db().drop_hard_fork_info();
+    return 0;
+  }
+#endif
+
   import_from_file(simple_core, import_file_path, block_stop);
 #endif