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cloudinit.go
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cloudinit.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.
// These functions are copied from github.com/coreos/coreos-cloudinit/config.
package v2_3
import (
"bytes"
"compress/gzip"
"io/ioutil"
"strings"
"unicode"
)
func isCloudConfig(userdata []byte) bool {
header := strings.SplitN(string(decompressIfGzipped(userdata)), "\n", 2)[0]
// Trim trailing whitespaces
header = strings.TrimRightFunc(header, unicode.IsSpace)
return (header == "#cloud-config")
}
func isScript(userdata []byte) bool {
header := strings.SplitN(string(decompressIfGzipped(userdata)), "\n", 2)[0]
return strings.HasPrefix(header, "#!")
}
func decompressIfGzipped(data []byte) []byte {
if reader, err := gzip.NewReader(bytes.NewReader(data)); err == nil {
uncompressedData, err := ioutil.ReadAll(reader)
reader.Close()
if err == nil {
return uncompressedData
} else {
return data
}
} else {
return data
}
}