wallet2: allow empty wallet filename to avoid saving data

Useful to speed tests up and avoid unnecessary leftover files

src/wallet/wallet2.cpp

@@ -2594,9 +2594,12 @@ crypto::secret_key wallet2::generate(const std::string& wallet_, const epee::wip
   clear();
   prepare_file_names(wallet_);
 
+  if (!wallet_.empty())
+  {
     boost::system::error_code ignored_ec;
     THROW_WALLET_EXCEPTION_IF(boost::filesystem::exists(m_wallet_file, ignored_ec), error::file_exists, m_wallet_file);
     THROW_WALLET_EXCEPTION_IF(boost::filesystem::exists(m_keys_file,   ignored_ec), error::file_exists, m_keys_file);
+  }
 
   crypto::secret_key retval = m_account.generate(recovery_param, recover, two_random);
 
@@ -2618,18 +2621,23 @@ crypto::secret_key wallet2::generate(const std::string& wallet_, const epee::wip
     m_refresh_from_block_height = height >= blocks_per_month ? height - blocks_per_month : 0;
   }
 
+  if (!wallet_.empty())
+  {
     bool r = store_keys(m_keys_file, password, false);
     THROW_WALLET_EXCEPTION_IF(!r, error::file_save_error, m_keys_file);
 
     r = file_io_utils::save_string_to_file(m_wallet_file + ".address.txt", m_account.get_public_address_str(m_testnet));
     if(!r) MERROR("String with address text not saved");
+  }
 
   cryptonote::block b;
   generate_genesis(b);
   m_blockchain.push_back(get_block_hash(b));
   add_subaddress_account(tr("Primary account"));
 
+  if (!wallet_.empty())
     store();
+
   return retval;
 }
 
@@ -2678,9 +2686,12 @@ void wallet2::generate(const std::string& wallet_, const epee::wipeable_string&
   clear();
   prepare_file_names(wallet_);
 
+  if (!wallet_.empty())
+  {
     boost::system::error_code ignored_ec;
     THROW_WALLET_EXCEPTION_IF(boost::filesystem::exists(m_wallet_file, ignored_ec), error::file_exists, m_wallet_file);
     THROW_WALLET_EXCEPTION_IF(boost::filesystem::exists(m_keys_file,   ignored_ec), error::file_exists, m_keys_file);
+  }
 
   m_account.create_from_viewkey(account_public_address, viewkey);
   m_account_public_address = account_public_address;
@@ -2689,17 +2700,21 @@ void wallet2::generate(const std::string& wallet_, const epee::wipeable_string&
   m_multisig_threshold = 0;
   m_multisig_total = 0;
 
+  if (!wallet_.empty())
+  {
     bool r = store_keys(m_keys_file, password, true);
     THROW_WALLET_EXCEPTION_IF(!r, error::file_save_error, m_keys_file);
 
     r = file_io_utils::save_string_to_file(m_wallet_file + ".address.txt", m_account.get_public_address_str(m_testnet));
     if(!r) MERROR("String with address text not saved");
+  }
 
   cryptonote::block b;
   generate_genesis(b);
   m_blockchain.push_back(get_block_hash(b));
   add_subaddress_account(tr("Primary account"));
 
+  if (!wallet_.empty())
     store();
 }
 
@@ -2717,9 +2732,12 @@ void wallet2::generate(const std::string& wallet_, const epee::wipeable_string&
   clear();
   prepare_file_names(wallet_);
 
+  if (!wallet_.empty())
+  {
     boost::system::error_code ignored_ec;
     THROW_WALLET_EXCEPTION_IF(boost::filesystem::exists(m_wallet_file, ignored_ec), error::file_exists, m_wallet_file);
     THROW_WALLET_EXCEPTION_IF(boost::filesystem::exists(m_keys_file,   ignored_ec), error::file_exists, m_keys_file);
+  }
 
   m_account.create_from_keys(account_public_address, spendkey, viewkey);
   m_account_public_address = account_public_address;
@@ -2728,16 +2746,20 @@ void wallet2::generate(const std::string& wallet_, const epee::wipeable_string&
   m_multisig_threshold = 0;
   m_multisig_total = 0;
 
+  if (!wallet_.empty())
+  {
     bool r = store_keys(m_keys_file, password, false);
     THROW_WALLET_EXCEPTION_IF(!r, error::file_save_error, m_keys_file);
 
     r = file_io_utils::save_string_to_file(m_wallet_file + ".address.txt", m_account.get_public_address_str(m_testnet));
     if(!r) MERROR("String with address text not saved");
+  }
 
   cryptonote::block b;
   generate_genesis(b);
   m_blockchain.push_back(get_block_hash(b));
 
+  if (!wallet_.empty())
     store();
 }
 
@@ -2789,17 +2811,21 @@ void wallet2::make_multisig(const epee::wipeable_string &password,
   m_multisig_threshold = threshold;
   m_multisig_total = spend_keys.size() + 1;
 
+  if (!m_wallet_file.empty())
+  {
     bool r = store_keys(m_keys_file, password, false);
     THROW_WALLET_EXCEPTION_IF(!r, error::file_save_error, m_keys_file);
 
     r = file_io_utils::save_string_to_file(m_wallet_file + ".address.txt", m_account.get_public_address_str(m_testnet));
     if(!r) MERROR("String with address text not saved");
+  }
 
   cryptonote::block b;
   generate_genesis(b);
   m_blockchain.push_back(get_block_hash(b));
   add_subaddress_account(tr("Primary account"));
 
+  if (!m_wallet_file.empty())
     store();
 }
 
@@ -2889,6 +2915,8 @@ bool wallet2::has_multisig_partial_key_images() const
  */
 void wallet2::rewrite(const std::string& wallet_name, const epee::wipeable_string& password)
 {
+  if (wallet_name.empty())
+    return;
   prepare_file_names(wallet_name);
   boost::system::error_code ignored_ec;
   THROW_WALLET_EXCEPTION_IF(!boost::filesystem::exists(m_keys_file, ignored_ec), error::file_not_found, m_keys_file);

tests/unit_tests/multisig.cpp

@@ -59,20 +59,10 @@ static void make_wallet(unsigned int idx, tools::wallet2 &wallet)
   crypto::secret_key spendkey;
   epee::string_tools::hex_to_pod(test_addresses[idx].spendkey, spendkey);
 
-  std::string basename = "/tmp/multisig-unit-test-" + std::to_string(idx);
   try
   {
-    boost::filesystem::remove(basename + ".keys");
-    boost::filesystem::remove(basename + ".address.txt");
-    boost::filesystem::remove(basename);
-
     wallet.init("");
-    wallet.generate(basename, "", spendkey, true, false);
+    wallet.generate("", "", spendkey, true, false);
-
-    boost::filesystem::remove(basename + ".keys");
-    boost::filesystem::remove(basename + ".address.txt");
-    boost::filesystem::remove(basename);
-
     ASSERT_TRUE(test_addresses[idx].address == wallet.get_account().get_public_address_str(true));
   }
   catch (const std::exception &e)