7 files changed, 27 insertions, 8 deletions
diff --git a/src/common/command_line.cpp b/src/common/command_line.cpp
index 925b62a54..5e5a9ff44 100644
--- a/src/common/command_line.cpp
+++ b/src/common/command_line.cpp
@@ -91,4 +91,9 @@ namespace command_line
   , "Show time-stats when processing blocks/txs and disk synchronization."
   , 0
   };
+  const command_line::arg_descriptor<bool> arg_fakechain  = {
+    "fakechain"
+  , "Use a fake chain for testing purposes."
+  , false
+  };
 }
diff --git a/src/common/command_line.h b/src/common/command_line.h
index ffac71704..8955b826e 100644
--- a/src/common/command_line.h
+++ b/src/common/command_line.h
@@ -215,4 +215,5 @@ namespace command_line
   extern const arg_descriptor<uint64_t> arg_prep_blocks_threads;
   extern const arg_descriptor<uint64_t> arg_db_auto_remove_logs;
   extern const arg_descriptor<uint64_t> arg_show_time_stats;
+  extern const arg_descriptor<bool> arg_fakechain;
 }
diff --git a/src/cryptonote_core/blockchain.cpp b/src/cryptonote_core/blockchain.cpp
index 195b5662e..5823c86f7 100644
--- a/src/cryptonote_core/blockchain.cpp
+++ b/src/cryptonote_core/blockchain.cpp
@@ -236,7 +236,7 @@ uint64_t Blockchain::get_current_blockchain_height() const
 //------------------------------------------------------------------
 //FIXME: possibly move this into the constructor, to avoid accidentally
 //       dereferencing a null BlockchainDB pointer
-bool Blockchain::init(BlockchainDB* db, const bool testnet)
+bool Blockchain::init(BlockchainDB* db, const bool testnet, const bool fakechain)
 {
     LOG_PRINT_L3("Blockchain::" << __func__);
     CRITICAL_REGION_LOCAL(m_blockchain_lock);
@@ -293,8 +293,11 @@ bool Blockchain::init(BlockchainDB* db, const bool testnet)
     {
     }
 
-    // ensure we fixup anything we found and fix in the future
-    m_db->fixup();
+    if (!fakechain)
+    {
+      // ensure we fixup anything we found and fix in the future
+      m_db->fixup();
+    }
 
     // check how far behind we are
     uint64_t top_block_timestamp = m_db->get_top_block_timestamp();
@@ -311,7 +314,7 @@ bool Blockchain::init(BlockchainDB* db, const bool testnet)
     m_async_pool.create_thread(boost::bind(&boost::asio::io_service::run, &m_async_service));
 
 #if defined(PER_BLOCK_CHECKPOINT)
-    if (m_fast_sync && get_blocks_dat_start(testnet) != nullptr)
+    if (!fakechain && m_fast_sync && get_blocks_dat_start(testnet) != nullptr)
     {
         if (get_blocks_dat_size(testnet) > 4)
         {
diff --git a/src/cryptonote_core/blockchain.h b/src/cryptonote_core/blockchain.h
index c83314634..f0b03ab0a 100644
--- a/src/cryptonote_core/blockchain.h
+++ b/src/cryptonote_core/blockchain.h
@@ -91,7 +91,7 @@ namespace cryptonote
 
     Blockchain(tx_memory_pool& tx_pool);
 
-    bool init(BlockchainDB* db, const bool testnet = false);
+    bool init(BlockchainDB* db, const bool testnet = false, const bool fakechain = false);
     bool deinit();
 
     void set_checkpoints(checkpoints&& chk_pts) { m_checkpoints = chk_pts; }
diff --git a/src/cryptonote_core/cryptonote_core.cpp b/src/cryptonote_core/cryptonote_core.cpp
index 2f21bd4f1..960c8eff8 100644
--- a/src/cryptonote_core/cryptonote_core.cpp
+++ b/src/cryptonote_core/cryptonote_core.cpp
@@ -97,7 +97,7 @@ namespace cryptonote
   //-----------------------------------------------------------------------------------------------
   bool core::update_checkpoints()
   {
-    if (m_testnet) return true;
+    if (m_testnet || m_fakechain) return true;
 
     if (m_checkpoints_updating.test_and_set()) return true;
 
@@ -145,18 +145,20 @@ namespace cryptonote
     command_line::add_arg(desc, command_line::arg_db_sync_mode);
     command_line::add_arg(desc, command_line::arg_show_time_stats);
     command_line::add_arg(desc, command_line::arg_db_auto_remove_logs);
+    command_line::add_arg(desc, command_line::arg_fakechain);
   }
   //-----------------------------------------------------------------------------------------------
   bool core::handle_command_line(const boost::program_options::variables_map& vm)
   {
     m_testnet = command_line::get_arg(vm, command_line::arg_testnet_on);
+    m_fakechain = command_line::get_arg(vm, command_line::arg_fakechain);
 
     auto data_dir_arg = m_testnet ? command_line::arg_testnet_data_dir : command_line::arg_data_dir;
     m_config_folder = command_line::get_arg(vm, data_dir_arg);
 
     auto data_dir = boost::filesystem::path(m_config_folder);
 
-    if (!m_testnet)
+    if (!m_testnet && !m_fakechain)
     {
       cryptonote::checkpoints checkpoints;
       if (!cryptonote::create_checkpoints(checkpoints))
@@ -257,6 +259,9 @@ namespace cryptonote
 
     boost::filesystem::path folder(m_config_folder);
 
+    if (m_fakechain)
+      folder /= "fake";
+
     folder /= db->get_db_name();
 
     LOG_PRINT_L0("Loading blockchain from folder " << folder.string() << " ...");
@@ -337,7 +342,7 @@ namespace cryptonote
     m_blockchain_storage.set_user_options(blocks_threads,
         blocks_per_sync, sync_mode, fast_sync);
 
-    r = m_blockchain_storage.init(db, m_testnet);
+    r = m_blockchain_storage.init(db, m_testnet, m_fakechain);
 
     bool show_time_stats = command_line::get_arg(vm, command_line::arg_show_time_stats) != 0;
     m_blockchain_storage.set_show_time_stats(show_time_stats);
diff --git a/src/cryptonote_core/cryptonote_core.h b/src/cryptonote_core/cryptonote_core.h
index e7a6c4154..5d665cb98 100644
--- a/src/cryptonote_core/cryptonote_core.h
+++ b/src/cryptonote_core/cryptonote_core.h
@@ -199,6 +199,7 @@ namespace cryptonote
      uint64_t m_target_blockchain_height;
 
      bool m_testnet;
+     bool m_fakechain;
      std::string m_checkpoints_path;
      time_t m_last_dns_checkpoints_update;
      time_t m_last_json_checkpoints_update;
diff --git a/tests/core_tests/chaingen.h b/tests/core_tests/chaingen.h
index 7c989b94f..fdcb62390 100644
--- a/tests/core_tests/chaingen.h
+++ b/tests/core_tests/chaingen.h
@@ -484,6 +484,10 @@ inline bool do_replay_events(std::vector<test_event_entry>& events)
   if (!r)
     return false;
 
+  // hardcode a --fakechain option for tests
+  static const char * const fakechain[] = {"", "--fakechain"};
+  boost::program_options::store(boost::program_options::parse_command_line(2, fakechain, desc), vm);
+
   cryptonote::cryptonote_protocol_stub pr; //TODO: stub only for this kind of test, make real validation of relayed objects
   cryptonote::core c(&pr);
   // FIXME: make sure that vm has arg_testnet_on set to true or false if