🎨 Port package to types

This refactors DefaultPackage into types.Package and gets rid of the
interface. This is a preceeding for a follow up where accessors will be
removed from the code.
It also does several cleanup, so we get rid also of some unneeded
dependencies.

pkg/database/migrations.go

@@ -0,0 +1,40 @@
+// Copyright © 2022 Ettore Di Giacinto <mudler@mocaccino.org>
+//
+// This program is free software; you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation; either version 2 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with this program; if not, see <http://www.gnu.org/licenses/>.
+
+package database
+
+import "go.etcd.io/bbolt"
+
+type schemaMigration func(tx *bbolt.Tx) error
+
+var migrations = []schemaMigration{migrateDefaultPackage}
+
+var migrateDefaultPackage schemaMigration = func(tx *bbolt.Tx) error {
+	// previously we had pkg.DefaultPackage
+	// IF it's there, rename it to the proper bucket
+	b := tx.Bucket([]byte("DefaultPackage"))
+	if b != nil {
+		newB, err := tx.CreateBucket([]byte("Package"))
+		if err != nil {
+			return nil
+		}
+		b.ForEach(func(k, v []byte) error {
+			return newB.Put(k, v)
+		})
+
+		tx.DeleteBucket([]byte("DefaultPackage"))
+	}
+	return nil
+}