create common package-manager interface

pkg/common.go

@@ -0,0 +1,13 @@
+package pkg
+
+// PackageManager is the common interface for all package-manager drivers (e.g. `dpkg` for debian-based, `pacman` for arch)
+type PackageManager interface {
+	// Fetch updates the package cache/databse
+	Fetch() bool
+	// Upgrade already installed packages and whatever can be upgraded with warranty (e.g. kernel)
+	Upgrade() bool
+	// Install a given package
+	Install(string) bool
+	// Remove a package given package
+	Remove(string) bool
+}