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out-of-tree/config/out-of-tree.go

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// 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 (
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"errors"
"os"
"time"
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"github.com/alecthomas/kong"
"github.com/mitchellh/go-homedir"
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"github.com/naoina/toml"
)
type DockerCommand struct {
DistroType DistroType
Command string
}
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type OutOfTree struct {
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// Directory for all files if not explicitly specified
Directory string
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Kernels string
UserKernels string
Database string
Qemu struct {
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Timeout Duration
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}
Docker struct {
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Timeout Duration
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Registry string
// Commands that will be executed before
// the base layer of Dockerfile
Commands []DockerCommand
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}
}
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func (c *OutOfTree) Decode(ctx *kong.DecodeContext) (err error) {
if ctx.Value.Set {
return
}
s, err := homedir.Expand(ctx.Scan.Pop().String())
if err != nil {
return
}
defaultValue, err := homedir.Expand(ctx.Value.Default)
if err != nil {
return
}
_, err = os.Stat(s)
if s != defaultValue && errors.Is(err, os.ErrNotExist) {
return errors.New("'" + s + "' does not exist")
}
*c, err = ReadOutOfTreeConf(s)
return
}
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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
}
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if c.Directory != "" {
Directory = c.Directory
} else {
c.Directory = Dir("")
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}
if c.Kernels == "" {
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c.Kernels = File("kernels.toml")
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}
if c.UserKernels == "" {
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c.UserKernels = File("kernels.user.toml")
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}
if c.Database == "" {
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c.Database = File("db.sqlite")
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}
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if c.Qemu.Timeout.Duration == 0 {
c.Qemu.Timeout.Duration = time.Minute
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}
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if c.Docker.Timeout.Duration == 0 {
c.Docker.Timeout.Duration = time.Minute
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}
return
}