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config.go
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/
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 v1
import (
"bytes"
"encoding/json"
"errors"
"fmt"
"github.com/coreos/ignition/config/v1/types"
"go4.org/errorutil"
)
var (
ErrVersion = errors.New("incorrect config version")
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)")
)
func Parse(rawConfig []byte) (config types.Config, err error) {
if err = json.Unmarshal(rawConfig, &config); err == nil {
if config.Version != types.Version {
err = ErrVersion
}
} 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 isEmpty(userdata []byte) bool {
return len(userdata) == 0
}