isomd5sum: init at 1.2.3

Adds isomd5sum as a package. This nifty utility helps with modifying ISO files,
specifically MD5 sums embedded in them.

pkgs/tools/cd-dvd/isomd5sum/default.nix

@@ -0,0 +1,38 @@
+{ stdenv, fetchFromGitHub
+, python3
+, popt
+}:
+
+stdenv.mkDerivation rec {
+  pname = "isomd5sum";
+  version = "1.2.3";
+
+  src = fetchFromGitHub {
+    owner = "rhinstaller";
+    repo = pname;
+    rev = version;
+    sha256 = "1wjnh2hlp1hjjm4a8wzdhdrm73jq41lmpmy3ls0rh715p3j7z4q9";
+  };
+
+  buildInputs = [ python3 popt ] ;
+
+  postPatch = ''
+    substituteInPlace Makefile --replace "#/usr/" "#"
+    substituteInPlace Makefile --replace "/usr/" "/"
+  '';
+
+  dontConfigure = true;
+
+  makeFlags = [ "DESTDIR=${placeholder "out"}" ];
+
+  # we don't install python stuff as it borks up directories
+  installTargets = "install-bin install-devel";
+
+  meta = with stdenv.lib; {
+    homepage = https://github.com/rhinstaller/isomd5sum;
+    description = "Utilities for working with md5sum implanted in ISO images";
+    platforms = platforms.linux;
+    license = licenses.gpl2;
+    maintainers = with maintainers; [ knl ];
+  };
+}

pkgs/top-level/all-packages.nix

@@ -2207,6 +2207,8 @@ in
     inherit (darwin.apple_sdk.frameworks) Carbon IOKit;
   };
 
+  isomd5sum = callPackage ../tools/cd-dvd/isomd5sum { };
+
   mdf2iso = callPackage ../tools/cd-dvd/mdf2iso { };
 
   nrg2iso = callPackage ../tools/cd-dvd/nrg2iso { };