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beskar-ostree.go
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beskar-ostree.go
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// SPDX-FileCopyrightText: Copyright (c) 2023-2024, CIQ, Inc. All rights reserved
// SPDX-License-Identifier: Apache-2.0
package config
import (
"bytes"
_ "embed"
"errors"
"fmt"
"io"
"os"
"path/filepath"
"reflect"
"strings"
"github.com/distribution/distribution/v3/configuration"
"go.ciq.dev/beskar/internal/pkg/config"
"go.ciq.dev/beskar/internal/pkg/gossip"
"go.ciq.dev/beskar/internal/pkg/log"
)
const (
BeskarOSTreeConfigFile = "beskar-ostree.yaml"
DefaultBeskarOSTreeDataDir = "/tmp/beskar-ostree"
)
//go:embed default/beskar-ostree.yaml
var defaultBeskarOSTreeConfig string
type BeskarOSTreeConfig struct {
Version string `yaml:"version"`
Log log.Config `yaml:"log"`
Addr string `yaml:"addr"`
Gossip gossip.Config `yaml:"gossip"`
Profiling bool `yaml:"profiling"`
DataDir string `yaml:"datadir"`
ConfigDirectory string `yaml:"-"`
Sync config.SyncConfig `yaml:"sync"`
}
type BeskarOSTreeConfigV1 BeskarOSTreeConfig
func ParseBeskarOSTreeConfig(dir string) (*BeskarOSTreeConfig, error) {
customDir := false
filename := filepath.Join(config.DefaultConfigDir, BeskarOSTreeConfigFile)
if dir != "" {
filename = filepath.Join(dir, BeskarOSTreeConfigFile)
customDir = true
}
configDir := filepath.Dir(filename)
var configReader io.Reader
f, err := os.Open(filename)
if err != nil {
if !errors.Is(err, os.ErrNotExist) || customDir {
return nil, err
}
configReader = strings.NewReader(defaultBeskarOSTreeConfig)
configDir = ""
} else {
defer func() {
if err := f.Close(); err != nil {
fmt.Println(err)
}
}()
configReader = f
}
configBuffer := new(bytes.Buffer)
if _, err := io.Copy(configBuffer, configReader); err != nil {
return nil, err
}
configParser := configuration.NewParser("beskarostree", []configuration.VersionedParseInfo{
{
Version: configuration.MajorMinorVersion(1, 0),
ParseAs: reflect.TypeOf(BeskarOSTreeConfigV1{}),
ConversionFunc: func(c interface{}) (interface{}, error) {
if v1, ok := c.(*BeskarOSTreeConfigV1); ok {
v1.ConfigDirectory = configDir
return (*BeskarOSTreeConfig)(v1), nil
}
return nil, fmt.Errorf("expected *BeskarOSTreeConfigV1, received %#v", c)
},
},
})
beskarOSTreeConfig := new(BeskarOSTreeConfig)
if err := configParser.Parse(configBuffer.Bytes(), beskarOSTreeConfig); err != nil {
return nil, err
}
if beskarOSTreeConfig.DataDir == "" {
beskarOSTreeConfig.DataDir = DefaultBeskarOSTreeDataDir
}
return beskarOSTreeConfig, nil
}