forked from coreos/ignition
/
config.go
101 lines (85 loc) · 2.54 KB
/
config.go
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// Copyright 2015 CoreOS, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package config
import (
"bytes"
"encoding/json"
"errors"
"fmt"
"github.com/coreos/ignition/config/types"
"github.com/coreos/ignition/config/v1"
"go4.org/errorutil"
)
var (
ErrCloudConfig = errors.New("not a config (found coreos-cloudconfig)")
ErrEmpty = errors.New("not a config (empty)")
ErrScript = errors.New("not a config (found coreos-cloudinit script)")
ErrDeprecated = errors.New("config format deprecated")
)
func Parse(rawConfig []byte) (types.Config, error) {
switch majorVersion(rawConfig) {
case 1:
config, err := ParseFromV1(rawConfig)
if err != nil {
return types.Config{}, err
}
return config, ErrDeprecated
default:
return ParseFromLatest(rawConfig)
}
}
func ParseFromLatest(rawConfig []byte) (config types.Config, err error) {
if err = json.Unmarshal(rawConfig, &config); err == nil {
err = config.Ignition.Version.AssertValid()
} else if isEmpty(rawConfig) {
err = ErrEmpty
} else if isCloudConfig(rawConfig) {
err = ErrCloudConfig
} else if isScript(rawConfig) {
err = ErrScript
}
if serr, ok := err.(*json.SyntaxError); ok {
line, col, highlight := errorutil.HighlightBytePosition(bytes.NewReader(rawConfig), serr.Offset)
err = fmt.Errorf("error at line %d, column %d\n%s%v", line, col, highlight, err)
}
return
}
func ParseFromV1(rawConfig []byte) (types.Config, error) {
config, err := v1.Parse(rawConfig)
if err != nil {
return types.Config{}, err
}
return TranslateFromV1(config)
}
func majorVersion(rawConfig []byte) int64 {
var composite struct {
Version *int `json:"ignitionVersion"`
Ignition struct {
Version *types.IgnitionVersion `json:"version"`
} `json:"ignition"`
}
if json.Unmarshal(rawConfig, &composite) != nil {
return 0
}
var major int64
if composite.Ignition.Version != nil {
major = composite.Ignition.Version.Major
} else if composite.Version != nil {
major = int64(*composite.Version)
}
return major
}
func isEmpty(userdata []byte) bool {
return len(userdata) == 0
}