Remove -detachdb and stop's detach argument.

As the only BDB database left is the wallet, and it is always
detached.

Also remove IsChainFile() predicate and related chainfile-specific
logic.

src/bitcoinrpc.cpp

@@ -179,14 +179,12 @@ Value help(const Array& params, bool fHelp)
 
 Value stop(const Array& params, bool fHelp)
 {
+    // Accept the deprecated and ignored 'detach´ boolean argument
     if (fHelp || params.size() > 1)
         throw runtime_error(
-            "stop <detach>\n"
+            "stop\n"
-            "<detach> is true or false to detach the database or not for this stop only\n"
+            "Stop Bitcoin server.");
-            "Stop Bitcoin server (and possibly override the detachdb config value).");
     // Shutdown will take long enough that the response should get back
-    if (params.size() > 0)
-        bitdb.SetDetach(params[0].get_bool());
     StartShutdown();
     return "Bitcoin server stopping";
 }

src/db.cpp

@@ -271,14 +271,6 @@ CDB::CDB(const char *pszFile, const char* pszMode) :
     }
 }
 
-static bool IsChainFile(std::string strFile)
-{
-    if (strFile == "coins.dat" || strFile == "blktree.dat")
-        return true;
-
-    return false;
-}
-
 void CDB::Flush()
 {
     if (activeTxn)
@@ -288,10 +280,6 @@ void CDB::Flush()
     unsigned int nMinutes = 0;
     if (fReadOnly)
         nMinutes = 1;
-    if (IsChainFile(strFile))
-        nMinutes = 2;
-    if (IsChainFile(strFile) && IsInitialBlockDownload())
-        nMinutes = 5;
 
     bitdb.dbenv.txn_checkpoint(nMinutes ? GetArg("-dblogsize", 100)*1024 : 0, nMinutes, 0);
 }
@@ -453,11 +441,9 @@ void CDBEnv::Flush(bool fShutdown)
                 CloseDb(strFile);
                 printf("%s checkpoint\n", strFile.c_str());
                 dbenv.txn_checkpoint(0, 0, 0);
-                if (!IsChainFile(strFile) || fDetachDB) {
                 printf("%s detach\n", strFile.c_str());
                 if (!fMockDb)
                     dbenv.lsn_reset(strFile.c_str(), 0);
-                }
                 printf("%s closed\n", strFile.c_str());
                 mapFileUseCount.erase(mi++);
             }

src/db.h

@@ -31,7 +31,6 @@ bool BackupWallet(const CWallet& wallet, const std::string& strDest);
 class CDBEnv
 {
 private:
-    bool fDetachDB;
     bool fDbEnvInit;
     bool fMockDb;
     boost::filesystem::path pathEnv;
@@ -71,8 +70,6 @@ public:
     void Close();
     void Flush(bool fShutdown);
     void CheckpointLSN(std::string strFile);
-    void SetDetach(bool fDetachDB_) { fDetachDB = fDetachDB_; }
-    bool GetDetach() { return fDetachDB; }
 
     void CloseDb(const std::string& strFile);
     bool RemoveDb(const std::string& strFile);

src/init.cpp

@@ -265,7 +265,6 @@ std::string HelpMessage()
         "  -upnp                  " + _("Use UPnP to map the listening port (default: 0)") + "\n" +
 #endif
 #endif
-        "  -detachdb              " + _("Detach block and address databases. Increases shutdown time (default: 0)") + "\n" +
         "  -paytxfee=<amt>        " + _("Fee per KB to add to transactions you send") + "\n" +
 #ifdef QT_GUI
         "  -server                " + _("Accept command line and JSON-RPC commands") + "\n" +
@@ -408,8 +407,6 @@ bool AppInit2()
     else
         fDebugNet = GetBoolArg("-debugnet");
 
-    bitdb.SetDetach(GetBoolArg("-detachdb", false));
-
 #if !defined(WIN32) && !defined(QT_GUI)
     fDaemon = GetBoolArg("-daemon");
 #else

src/qt/bitcoinstrings.cpp

@@ -27,8 +27,6 @@ QT_TRANSLATE_NOOP("bitcoin-core", ""
 "Cannot obtain a lock on data directory %s.  Bitcoin is probably already "
 "running."),
 QT_TRANSLATE_NOOP("bitcoin-core", ""
-"Detach block and address databases. Increases shutdown time (default: 0)"),
-QT_TRANSLATE_NOOP("bitcoin-core", ""
 "Error: The transaction was rejected.  This might happen if some of the coins "
 "in your wallet were already spent, such as if you used a copy of wallet.dat "
 "and coins were spent in the copy but not marked as spent here."),

src/qt/forms/optionsdialog.ui

@@ -86,16 +86,6 @@
          </property>
         </widget>
        </item>
-       <item>
-        <widget class="QCheckBox" name="detachDatabases">
-         <property name="toolTip">
-          <string>Detach block and address databases at shutdown. This means they can be moved to another data directory, but it slows down shutdown. The wallet is always detached.</string>
-         </property>
-         <property name="text">
-          <string>&amp;Detach databases at shutdown</string>
-         </property>
-        </widget>
-       </item>
        <item>
         <spacer name="verticalSpacer_Main">
          <property name="orientation">

src/qt/optionsdialog.cpp

@@ -128,7 +128,6 @@ void OptionsDialog::setMapper()
     /* Main */
     mapper->addMapping(ui->transactionFee, OptionsModel::Fee);
     mapper->addMapping(ui->bitcoinAtStartup, OptionsModel::StartAtStartup);
-    mapper->addMapping(ui->detachDatabases, OptionsModel::DetachDatabases);
 
     /* Network */
     mapper->addMapping(ui->mapPortUpnp, OptionsModel::MapPortUPnP);

src/qt/optionsmodel.cpp

@@ -56,8 +56,6 @@ void OptionsModel::Init()
         SoftSetArg("-proxy", settings.value("addrProxy").toString().toStdString());
     if (settings.contains("nSocksVersion") && settings.value("fUseProxy").toBool())
         SoftSetArg("-socks", settings.value("nSocksVersion").toString().toStdString());
-    if (settings.contains("detachDB"))
-        SoftSetBoolArg("-detachdb", settings.value("detachDB").toBool());
     if (!language.isEmpty())
         SoftSetArg("-lang", language.toStdString());
 }
@@ -173,8 +171,6 @@ QVariant OptionsModel::data(const QModelIndex & index, int role) const
             return QVariant(nDisplayUnit);
         case DisplayAddresses:
             return QVariant(bDisplayAddresses);
-        case DetachDatabases:
-            return QVariant(bitdb.GetDetach());
         case Language:
             return settings.value("language", "");
         default:
@@ -256,12 +252,6 @@ bool OptionsModel::setData(const QModelIndex & index, const QVariant & value, in
             bDisplayAddresses = value.toBool();
             settings.setValue("bDisplayAddresses", bDisplayAddresses);
             break;
-        case DetachDatabases: {
-            bool fDetachDB = value.toBool();
-            bitdb.SetDetach(fDetachDB);
-            settings.setValue("detachDB", fDetachDB);
-            }
-            break;
         case Language:
             settings.setValue("language", value);
             break;

src/qt/optionsmodel.h

@@ -28,7 +28,6 @@ public:
         Fee,               // qint64
         DisplayUnit,       // BitcoinUnits::Unit
         DisplayAddresses,  // bool
-        DetachDatabases,   // bool
         Language,          // QString
         OptionIDRowCount,
     };