Add a nix-shell fuzzing file

Signed-off-by: Jeroen Simonetti <jeroen@simonetti.nl>

fuzz-shell.nix

@@ -0,0 +1,29 @@
+with import <nixpkgs> { };
+pkgs.mkShell {
+  name = "go-fuzz";
+  buildInputs = [ go ];
+  shellHook = ''
+    function setup() {
+      export GOPATH=/tmp/.GOPATH
+      export GOPATH=$(mktemp /tmp/GOPATH.XXXXXX)
+      mkdir -p $GOPATH/src
+      pushd $GOPATH/src
+      go get github.com/dvyukov/go-fuzz/go-fuzz
+      go get github.com/dvyukov/go-fuzz/go-fuzz-build 
+      popd
+    }
+    function teardown() {
+      chmod -R u+w $GOPATH
+      rm -rf $GOPATH
+    }
+    setup
+    trap teardown EXIT
+    alias fuzzbuild="$GOPATH/bin/go-fuzz-build -tags gofuzz"
+    alias fuzz="$GOPATH/bin/go-fuzz -bin=./rtnetlink-fuzz.zip -workdir=testdata"
+    echo "Fuzz environment ready. There are 2 aliases available:"
+    echo ""
+    echo "fuzzbuild - will build the fuzzing file"
+    echo "fuzz      - will start fuzzing"
+    echo ""
+  '';
+}