fs/rc: add more infrastructure to help writing rc functions

- Fs cache for rc commands
- Helper functions for parsing the input
- Reshape command for manipulating JSON blobs
- Background Job starting, control, query and expiry

fs/rc/rc_test.go

@@ -0,0 +1,23 @@
+package rc
+
+import (
+	"bytes"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestWriteJSON(t *testing.T) {
+	var buf bytes.Buffer
+	err := WriteJSON(&buf, Params{
+		"String": "hello",
+		"Int":    42,
+	})
+	require.NoError(t, err)
+	assert.Equal(t, `{
+	"Int": 42,
+	"String": "hello"
+}
+`, buf.String())
+}