Export $HOME lookup to pkg/homedir

Signed-off-by: Ahmet Alp Balkan <ahmetb@microsoft.com>

homedir/homedir.go

@@ -0,0 +1,16 @@
+package homedir
+
+import (
+	"os"
+	"runtime"
+)
+
+// Get returns the home directory of the current user with the help of
+// environment variables depending on the target operating system.
+// Returned path should be used with "path/filepath" to form new paths.
+func Get() string {
+	if runtime.GOOS == "windows" {
+		return os.Getenv("USERPROFILE")
+	}
+	return os.Getenv("HOME")
+}