6 files changed, 39 insertions, 14 deletions
diff --git a/src/daemon/command_parser_executor.cpp b/src/daemon/command_parser_executor.cpp
index aa688294d..1638cf505 100644
--- a/src/daemon/command_parser_executor.cpp
+++ b/src/daemon/command_parser_executor.cpp
@@ -614,13 +614,13 @@ bool t_command_parser_executor::print_coinbase_tx_sum(const std::vector<std::str
 
 bool t_command_parser_executor::alt_chain_info(const std::vector<std::string>& args)
 {
-  if(args.size())
+  if(args.size() > 1)
   {
-    std::cout << "No parameters allowed" << std::endl;
+    std::cout << "usage: alt_chain_info [block_hash]" << std::endl;
     return false;
   }
 
-  return m_executor.alt_chain_info();
+  return m_executor.alt_chain_info(args.size() == 1 ? args[0] : "");
 }
 
 bool t_command_parser_executor::print_blockchain_dynamic_stats(const std::vector<std::string>& args)
diff --git a/src/daemon/command_server.cpp b/src/daemon/command_server.cpp
index 144603597..35504f2c9 100644
--- a/src/daemon/command_server.cpp
+++ b/src/daemon/command_server.cpp
@@ -255,6 +255,7 @@ t_command_server::t_command_server(
     m_command_lookup.set_handler(
       "alt_chain_info"
     , std::bind(&t_command_parser_executor::alt_chain_info, &m_parser, p::_1)
+    , "alt_chain_info [blockhash]"
     , "Print the information about alternative chains."
     );
     m_command_lookup.set_handler(
diff --git a/src/daemon/daemon.cpp b/src/daemon/daemon.cpp
index 48671f190..ea24e32eb 100644
--- a/src/daemon/daemon.cpp
+++ b/src/daemon/daemon.cpp
@@ -77,9 +77,10 @@ public:
 
     const auto testnet = command_line::get_arg(vm, cryptonote::arg_testnet_on);
     const auto stagenet = command_line::get_arg(vm, cryptonote::arg_stagenet_on);
+    const auto regtest = command_line::get_arg(vm, cryptonote::arg_regtest_on);
     const auto restricted = command_line::get_arg(vm, cryptonote::core_rpc_server::arg_restricted_rpc);
     const auto main_rpc_port = command_line::get_arg(vm, cryptonote::core_rpc_server::arg_rpc_bind_port);
-    rpcs.emplace_back(new t_rpc{vm, core, p2p, restricted, testnet ? cryptonote::TESTNET : stagenet ? cryptonote::STAGENET : cryptonote::MAINNET, main_rpc_port, "core"});
+    rpcs.emplace_back(new t_rpc{vm, core, p2p, restricted, testnet ? cryptonote::TESTNET : stagenet ? cryptonote::STAGENET : regtest ? cryptonote::FAKECHAIN : cryptonote::MAINNET, main_rpc_port, "core"});
 
     auto restricted_rpc_port_arg = cryptonote::core_rpc_server::arg_rpc_restricted_bind_port;
     if(!command_line::is_arg_defaulted(vm, restricted_rpc_port_arg))
diff --git a/src/daemon/main.cpp b/src/daemon/main.cpp
index 88bb1fd0c..82ece62a9 100644
--- a/src/daemon/main.cpp
+++ b/src/daemon/main.cpp
@@ -163,9 +163,10 @@ int main(int argc, char const * argv[])
 
     const bool testnet = command_line::get_arg(vm, cryptonote::arg_testnet_on);
     const bool stagenet = command_line::get_arg(vm, cryptonote::arg_stagenet_on);
-    if (testnet && stagenet)
+    const bool regtest = command_line::get_arg(vm, cryptonote::arg_regtest_on);
+    if (testnet + stagenet + regtest > 1)
     {
-      std::cerr << "Can't specify more than one of --tesnet and --stagenet" << ENDL;
+      std::cerr << "Can't specify more than one of --tesnet and --stagenet and --regtest" << ENDL;
       return 1;
     }
 
diff --git a/src/daemon/rpc_command_executor.cpp b/src/daemon/rpc_command_executor.cpp
index 956c84a01..e2b42c806 100644
--- a/src/daemon/rpc_command_executor.cpp
+++ b/src/daemon/rpc_command_executor.cpp
@@ -75,7 +75,9 @@ namespace {
       << "hash: " << header.hash << std::endl
       << "difficulty: " << boost::lexical_cast<std::string>(header.difficulty) << std::endl
       << "POW hash: " << header.pow_hash << std::endl
-      << "reward: " << boost::lexical_cast<std::string>(header.reward);
+      << "block size: " << header.block_size << std::endl
+      << "num txes: " << header.num_txes << std::endl
+      << "reward: " << cryptonote::print_money(header.reward);
   }
 
   std::string get_human_time_ago(time_t t, time_t now)
@@ -1628,7 +1630,7 @@ bool t_rpc_command_executor::print_coinbase_tx_sum(uint64_t height, uint64_t cou
   return true;
 }
 
-bool t_rpc_command_executor::alt_chain_info()
+bool t_rpc_command_executor::alt_chain_info(const std::string &tip)
 {
   cryptonote::COMMAND_RPC_GET_INFO::request ireq;
   cryptonote::COMMAND_RPC_GET_INFO::response ires;
@@ -1663,12 +1665,32 @@ bool t_rpc_command_executor::alt_chain_info()
     }
   }
 
-  tools::msg_writer() << boost::lexical_cast<std::string>(res.chains.size()) << " alternate chains found:";
-  for (const auto &chain: res.chains)
+  if (tip.empty())
   {
-    uint64_t start_height = (chain.height - chain.length + 1);
-    tools::msg_writer() << chain.length << " blocks long, from height " << start_height << " (" << (ires.height - start_height - 1)
-        << " deep), diff " << chain.difficulty << ": " << chain.block_hash;
+    tools::msg_writer() << boost::lexical_cast<std::string>(res.chains.size()) << " alternate chains found:";
+    for (const auto &chain: res.chains)
+    {
+      uint64_t start_height = (chain.height - chain.length + 1);
+      tools::msg_writer() << chain.length << " blocks long, from height " << start_height << " (" << (ires.height - start_height - 1)
+          << " deep), diff " << chain.difficulty << ": " << chain.block_hash;
+    }
+  }
+  else
+  {
+    const auto i = std::find_if(res.chains.begin(), res.chains.end(), [&tip](cryptonote::COMMAND_RPC_GET_ALTERNATE_CHAINS::chain_info &info){ return info.block_hash == tip; });
+    if (i != res.chains.end())
+    {
+      const auto &chain = *i;
+      tools::success_msg_writer() << "Found alternate chain with tip " << tip;
+      uint64_t start_height = (chain.height - chain.length + 1);
+      tools::msg_writer() << chain.length << " blocks long, from height " << start_height << " (" << (ires.height - start_height - 1)
+          << " deep), diff " << chain.difficulty << ":";
+      for (const std::string &block_id: chain.block_hashes)
+        tools::msg_writer() << "  " << block_id;
+      tools::msg_writer() << "Chain parent on main chain: " << chain.main_chain_parent_block;
+    }
+    else
+      tools::fail_msg_writer() << "Block hash " << tip << " is not the tip of any known alternate chain";
   }
   return true;
 }
diff --git a/src/daemon/rpc_command_executor.h b/src/daemon/rpc_command_executor.h
index 46168c93b..9e6010c5b 100644
--- a/src/daemon/rpc_command_executor.h
+++ b/src/daemon/rpc_command_executor.h
@@ -143,7 +143,7 @@ public:
 
   bool print_coinbase_tx_sum(uint64_t height, uint64_t count);
 
-  bool alt_chain_info();
+  bool alt_chain_info(const std::string &tip);
 
   bool print_blockchain_dynamic_stats(uint64_t nblocks);