Introduce global configuration file

config/out-of-tree.go

@@ -0,0 +1,68 @@
+// Copyright 2019 Mikhail Klementev. All rights reserved.
+// Use of this source code is governed by a AGPLv3 license
+// (or later) that can be found in the LICENSE file.
+
+package config
+
+import (
+	"os/user"
+
+	"github.com/naoina/toml"
+)
+
+type OutOfTree struct {
+	Kernels     string
+	UserKernels string
+
+	Database string
+
+	Qemu struct {
+		Timeout string
+	}
+
+	Docker struct {
+		Timeout  string
+		Registry string
+	}
+}
+
+func ReadOutOfTreeConf(path string) (c OutOfTree, err error) {
+	buf, err := readFileAll(path)
+	if err == nil {
+		err = toml.Unmarshal(buf, &c)
+		if err != nil {
+			return
+		}
+	} else {
+		// It's ok if there's no configuration
+		// then we'll just set default values
+		err = nil
+	}
+
+	usr, err := user.Current()
+	if err != nil {
+		return
+	}
+
+	if c.Kernels == "" {
+		c.Kernels = usr.HomeDir + "/.out-of-tree/kernels.toml"
+	}
+
+	if c.UserKernels == "" {
+		c.UserKernels = usr.HomeDir + "/.out-of-tree/kernels.user.toml"
+	}
+
+	if c.Database == "" {
+		c.Database = usr.HomeDir + "/.out-of-tree/db.sqlite"
+	}
+
+	if c.Qemu.Timeout == "" {
+		c.Qemu.Timeout = "1m"
+	}
+
+	if c.Docker.Timeout == "" {
+		c.Docker.Timeout = "1m"
+	}
+
+	return
+}