ENH: add stub function to codedFixedValueFvPatchScalarField for version checking

- eg, fixedValue10_<SHA1>, its existence indicates that the correct
  library has been loaded

etc/codeTemplates/codeStream/fixedValueFvPatchScalarFieldTemplate.C

@@ -35,6 +35,20 @@ ${codeInclude}
 namespace Foam
 {
 
+// * * * * * * * * * * * * * * * Global Functions  * * * * * * * * * * * * * //
+
+extern "C"
+{
+    // unique function name that can be checked if the correct library version
+    // has been loaded
+    bool ${typeName}_${SHA1sum}()
+    {
+        return true;
+    }
+}
+
+
+
 // * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
 
 ${typeName}FixedValueFvPatchScalarField::

src/OpenFOAM/db/dictionary/functionEntries/codeStream/codeStream.C

@@ -35,7 +35,8 @@ License
 #include "dlLibraryTable.H"
 #include "OSspecific.H"
 #include "Time.H"
-#include "Pstream.H"
+#include "PstreamReduceOps.H"
+
 
 // * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
 
@@ -70,18 +71,11 @@ bool Foam::functionEntries::codeStream::execute
     Istream& is
 )
 {
-    if (isAdministrator())
-    {
-        FatalIOErrorIn
-        (
-            "functionEntries::codeStream::execute(..)",
-            parentDict
-        )   << "This code should not be executed by someone with administrator"
-            << " rights due to security reasons." << endl
-            << "(it writes a shared library which then gets loaded "
-            << "using dlopen)"
-            << exit(FatalIOError);
-    }
+    codeStreamTools::checkSecurity
+    (
+        "functionEntries::codeStream::execute(..)",
+        parentDict
+    );
 
     // get code dictionary
     // must reference parent for stringOps::expand to work nicely
@@ -175,6 +169,7 @@ bool Foam::functionEntries::codeStream::execute
                 copyFiles[0].file() = fileCsrc;
                 copyFiles[0].set("codeInclude", codeInclude);
                 copyFiles[0].set("code", code);
+                copyFiles[0].set("SHA1sum", sha.str());
 
                 List<codeStreamTools::fileAndContent> filesContents(2);
 
@@ -218,8 +213,9 @@ bool Foam::functionEntries::codeStream::execute
             }
         }
 
-//        bool dummy = true;
-//        reduce(dummy, orOp<bool>());
+        // all processes must wait for compile
+        bool dummy = true;
+        reduce(dummy, orOp<bool>());
 
         if (!dlLibraryTable::open(libPath, false))
         {

src/OpenFOAM/db/dynamicLibrary/codeStream/codeStreamTools.C

@@ -49,6 +49,28 @@ const Foam::fileName Foam::codeStreamTools::codeTemplateDirName
 
 // * * * * * * * * * * * * * Static Member Functions * * * * * * * * * * * * //
 
+void Foam::codeStreamTools::checkSecurity
+(
+    const char* title,
+    const dictionary& context
+)
+{
+    if (isAdministrator())
+    {
+        FatalIOErrorIn
+        (
+            title,
+            context
+        )   << "This code should not be executed by someone with administrator"
+            << " rights due to security reasons." << nl
+            << "(it writes a shared library which then gets loaded "
+            << "using dlopen)"
+            << exit(FatalIOError);
+    }
+}
+
+
+
 Foam::fileName Foam::codeStreamTools::codePath(const word& subDirName)
 {
     return stringOps::expand("$FOAM_CASE/codeStream/" + subDirName);
@@ -253,6 +275,13 @@ bool Foam::codeStreamTools::copyFilesContents(const fileName& dir) const
         // variables mapping
         HashTable<string> mapping(copyFiles_[i]);
         mapping.set("typeName", name_);
+
+        // provide a zero digest if not otherwise specified
+        if (!mapping.found("SHA1sum"))
+        {
+            mapping.insert("SHA1sum", SHA1Digest().str());
+        }
+
         copyAndExpand(is, os, mapping);
     }
 

src/OpenFOAM/db/dynamicLibrary/codeStream/codeStreamTools.H

@@ -145,6 +145,13 @@ public:
 
     // Member functions
 
+        //- Check security for creating dynamic code
+        static void checkSecurity
+        (
+            const char* title,
+            const dictionary& context
+        );
+
         //- Local path for specified code name
         //  Expanded from \$FOAM_CASE/codeStream
         static fileName codePath(const word& subDirName);

src/finiteVolume/fields/fvPatchFields/derived/codedFixedValue/codedFixedValueFvPatchScalarField.C

@@ -124,7 +124,9 @@ void Foam::codedFixedValueFvPatchScalarField::writeLibrary
 //        <<"new SHA1: " << sha << endl;
 
 
-    // (void) codeStreamTools::upToDate(codePath, sha)
+    // only use side-effect of writing  SHA1Digest for now
+    (void) codeStreamTools::upToDate(codePath, sha);
+
     // TODO: compile on-demand
     if (true)
     {
@@ -152,6 +154,7 @@ void Foam::codedFixedValueFvPatchScalarField::writeLibrary
         copyFiles[0].file() = fileCsrc;
         copyFiles[0].set("codeInclude", codeInclude);
         copyFiles[0].set("code", code);
+        copyFiles[0].set("SHA1sum", sha.str());
 
         copyFiles[1].file() = fileHsrc;
 
@@ -190,18 +193,11 @@ void Foam::codedFixedValueFvPatchScalarField::writeLibrary
 
 void Foam::codedFixedValueFvPatchScalarField::updateLibrary()
 {
-    if (isAdministrator())
-    {
-        FatalIOErrorIn
-        (
-            "codedFixedValueFvPatchScalarField::updateLibrary()",
-            dict_
-        )   << "This code should not be executed by someone with administrator"
-            << " rights due to security reasons." << endl
-            << "(it writes a shared library which then gets loaded "
-            << "using dlopen)"
-            << exit(FatalIOError);
-    }
+    codeStreamTools::checkSecurity
+    (
+        "codedFixedValueFvPatchScalarField::updateLibrary()",
+        dict_
+    );
 
     // write code into redirectType_ subdir
     const fileName codePath = codeStreamTools::codePath(redirectType_);
@@ -220,6 +216,16 @@ void Foam::codedFixedValueFvPatchScalarField::updateLibrary()
 
     void* lib = dlLibraryTable::findLibrary(libPath);
 
+
+    // TODO:
+    // calculate old/new SHA1 for code
+    // check if the correct library version was already loaded.
+    // Find the library handle.
+ //
+ // string signatureName(redirectType_ + "_" + sha().str());
+ // void (*signatureFunction)();
+ // signatureFunction = reinterpret_cast<void(*)()>(dlSym(lib, signatureName));
+
     if (dict_.found("code"))
     {
         if (!lib)
@@ -274,6 +280,7 @@ void Foam::codedFixedValueFvPatchScalarField::updateLibrary()
             }
         }
 
+        // all processes must wait for compile
         bool dummy = true;
         reduce(dummy, orOp<bool>());