Add extrae and perf stages

bsc/garlic/extrae.nix

@@ -0,0 +1,30 @@
+{
+  stdenv
+, bash
+, extrae
+}:
+
+{
+  app
+, traceLib ? "mpi"
+, configFile
+, program ? "bin/run"
+}:
+
+stdenv.mkDerivation {
+  name = "${app.name}-extrae";
+  preferLocalBuild = true;
+  phases = [ "installPhase" ];
+  installPhase = ''
+    mkdir -p $out/bin
+    cat > $out/bin/run <<EOF
+    #!${bash}/bin/bash
+
+    export EXTRAE_HOME=${extrae}
+    export LD_PRELOAD=${extrae}/lib/lib${traceLib}trace.so:$LD_PRELOAD
+    export EXTRAE_CONFIG_FILE=${configFile}
+    exec ${app}/${program}
+    EOF
+    chmod +x $out/bin/run
+  '';
+}