iomelt: new package

This adds the IOMelt pacakge, "a simple yet effective way to benchmark disk IO
in Linux systems."

pkgs/os-specific/linux/iomelt/default.nix

@@ -0,0 +1,25 @@
+{ stdenv, lib, fetchurl }:
+
+let version = "0.7";
+in stdenv.mkDerivation {
+  name = "iomelt-${version}";
+  src = fetchurl {
+    url = "http://iomelt.com/s/iomelt-${version}.tar.gz";
+    sha256 = "1jhrdm5b7f1bcbrdwcc4yzg26790jxl4d2ndqiwd9brl2g5537im";
+  };
+
+  preBuild = ''
+    ensureDir $out/bin
+    ensureDir $out/share/man/man1
+
+    substituteInPlace Makefile \
+      --replace /usr $out
+  '';
+
+  meta = with lib; {
+    description = "A simple yet effective way to benchmark disk IO in Linux systems";
+    homepage    = http://www.iomelt.com;
+    maintainers = with maintainers; [ cstrahan ];
+    platforms   = platforms.linux ++ platforms.darwin;
+  };
+}

pkgs/top-level/all-packages.nix

@@ -7151,6 +7151,8 @@ let
 
   ifplugd = callPackage ../os-specific/linux/ifplugd { };
 
+  iomelt = callPackage ../os-specific/linux/iomelt { };
+
   iotop = callPackage ../os-specific/linux/iotop { };
 
   iproute = callPackage ../os-specific/linux/iproute { };