Improve detection of existing configured security database

builds/install/arch-specific/win32/FirebirdInstall.iss

@@ -635,6 +635,10 @@ program Setup;
 // b) Debugged.
 // This hopefully keeps the main script simpler to follow.
 
+
+const
+  UNDEFINED = -1;
+
 Var
   InstallRootDir: String;
   FirebirdConfSaved: String;
@@ -650,6 +654,8 @@ Var
 
   SYSDBAPassword: String;       // SYSDBA password
 
+  init_secdb: integer;          // Is set to UNDEFINED by default in InitializeSetup
+
 #ifdef setuplogging
 // Not yet implemented - leave log in %TEMP%
 //  OkToCopyLog : Boolean;        // Set when installation is complete.
@@ -741,6 +747,7 @@ begin
   InitExistingInstallRecords;
   AnalyzeEnvironment;
   result := AnalysisAssessment;
+  init_secdb := UNDEFINED;
 
 end;
 
@@ -1052,7 +1059,8 @@ begin
       IncrementSharedCount(Is64BitInstallMode, GetAppPath+'\security{#FB_MAJOR_VER}.fdb', false);
       IncrementSharedCount(Is64BitInstallMode, GetAppPath+'\replication.conf', false);
 
-			InitSecurityDB;
+      if init_secdb = 1 then
+        InitSecurityDB;
 
       //Fix up conf file
       UpdateFirebirdConf;

builds/install/arch-specific/win32/FirebirdInstallEnvironmentChecks.inc

@@ -1480,14 +1480,27 @@ end;
 
 
 function ConfigureAuthentication: boolean;
+// This function should only be called once - when the innosetup installer tries to
+// install the secdb. If it is called a second time it will always find the secdb
+// exists, even if it hasn't been configured. The only real way to test whether we
+// should configure authentication is to actually _open_ a database and read the
+// sec$users table. Except we cannot do that as we need this information before we
+// install the files needed to read the database.
 begin
-  if IsNotServerInstall then
-    Result := false
-  else
-    if FileExists(WizardDirValue + '\security6.fdb') then
+  // if it is the first time we are called test for existence of the security db
+  if init_secdb = UNDEFINED then begin
+    if FileExists(WizardDirValue + '\security{#FB_MAJOR_VER}.fdb') then
       Result := false
     else
-      Result := true;
+      Result := true
+    end
+  else
+    // else the result is the current setting of init_secdb
+    Result := Boolean(init_secdb);
+
+  // Whatever the result, cast it to an integer and update init_secdb
+  init_secdb := Integer(Result);
+
 end;