GODT-1244: Refactor switching stable-early and factory reset

internal/versioner/remove_linux.go

@@ -0,0 +1,52 @@
+// Copyright (c) 2021 Proton Technologies AG
+//
+// This file is part of ProtonMail Bridge.
+//
+// ProtonMail Bridge 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 3 of the License, or
+// (at your option) any later version.
+//
+// ProtonMail Bridge 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 ProtonMail Bridge.  If not, see <https://www.gnu.org/licenses/>.
+
+//go:build linux
+// +build linux
+
+package versioner
+
+import (
+	"os"
+	"path/filepath"
+	"strings"
+)
+
+func (v *Versioner) RemoveCurrentVersion() error {
+	// get current executable
+	exec, err := os.Executable()
+	if err != nil {
+		return err
+	}
+
+	// Check that current executtable is update package so we won't
+	// delete base version (that is controlled by package manager).
+	// Get absolute paths to ensure there is no crazy stuff there.
+	absExec, err := filepath.Abs(exec)
+	if err != nil {
+		return err
+	}
+	absRoot, err := filepath.Abs(v.root)
+	if err != nil {
+		return err
+	}
+	if !strings.HasPrefix(absExec, absRoot) {
+		return ErrNoRemoveBase
+	}
+
+	return os.RemoveAll(filepath.Dir(absExec))
+}