change EventLoopGrid test to download datasets on submission nodes

Since not all grid sites allow direct file access from the outside
this makes the tests more robust.

PhysicsAnalysis/D3PDTools/EventLoopTest/Root/UnitTest.cxx

@@ -164,6 +164,7 @@ namespace EL
 
       for (std::size_t iter = 0, end = samples.size(); iter != end; ++ iter)
       {
+        ANA_MSG_INFO ("looking at sample " << samples[iter]->name());
 	TH1 *ref_hist = dynamic_cast<TH1*>(samples[iter]->meta()->get ("hist"));
 	if (ref_hist != 0)
 	{
@@ -177,6 +178,7 @@ namespace EL
 	  {
 	    TH1 *file_executes = dynamic_cast<TH1*>(sample->readHist ("file_executes"));
 	    RCU_ASSERT_SOFT (file_executes != 0);
+            ANA_MSG_INFO ("file executes: " << file_executes->GetEntries() << " " << samples[iter]->makeFileList().size());
 	    RCU_ASSERT_SOFT (file_executes->GetEntries() == samples[iter]->makeFileList().size());
 	  }
 

PhysicsAnalysis/D3PDTools/EventLoopTest/test/ut_driver_grid.cxx

@@ -11,6 +11,8 @@
 
 #include <EventLoopGrid/PrunDriver.h>
 #include <EventLoopTest/UnitTest.h>
+#include <RootCoreUtils/ShellExec.h>
+#include <SampleHandler/GridTools.h>
 #include <sstream>
 #include <time.h>
 
@@ -22,6 +24,20 @@ using namespace EL;
 
 int main ()
 {
+  // can't use my current directory, it may easily overflow
+  std::ostringstream stageDir;
+  {
+    const char *TMPDIR = getenv ("TMPDIR");
+    if (TMPDIR)
+      stageDir << TMPDIR << "/";
+    else
+      stageDir << "/tmp/";
+  }
+  stageDir << "GridToolsTest." << getpid();
+  RCU::Shell::exec ("rm -rf " + RCU::Shell::quote (stageDir.str()));
+  RCU::Shell::exec ("mkdir -p " + RCU::Shell::quote (stageDir.str()));
+  setenv (SH::downloadStageEnvVar().c_str(), stageDir.str().c_str(), 0);
+
   PrunDriver driver;
   std::ostringstream output;
   output << "user.krumnack.EventLoopTest.output." << time(nullptr) << ".%in:name[6]%";