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uuid_linux.go
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uuid_linux.go
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// Copyright 2016 VMware, Inc. All Rights Reserved.
//
// 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 sys
import (
"fmt"
"io/ioutil"
"strings"
)
const (
UUIDPath = "/sys/class/dmi/id/product_serial"
UUIDPrefix = "VMware-"
)
// UUID gets the BIOS UUID via the sys interface. This UUID is known by vphsere
func UUID() (string, error) {
id, err := ioutil.ReadFile(UUIDPath)
if err != nil {
return "", fmt.Errorf("error retrieving vm uuid: %s", err)
}
uuidstr := string(id[:])
// check the uuid starts with "VMware-"
if !strings.HasPrefix(uuidstr, UUIDPrefix) {
return "", fmt.Errorf("cannot find this VM's UUID")
}
// Strip the prefix, white spaces, and the trailing '\n'
uuidstr = strings.Replace(uuidstr[len(UUIDPrefix):(len(uuidstr)-1)], " ", "", -1)
// need to add dashes, e.g. "564d395e-d807-e18a-cb25-b79f65eb2b9f"
uuidstr = fmt.Sprintf("%s-%s-%s-%s", uuidstr[0:8], uuidstr[8:12], uuidstr[12:21], uuidstr[21:])
return uuidstr, nil
}