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47 lines
1.4 KiB
Go
47 lines
1.4 KiB
Go
/*
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Copyright 2015 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package util
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import (
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"os"
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"strings"
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"github.com/pkg/errors"
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)
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// GetHostname returns OS's hostname if 'hostnameOverride' is empty; otherwise, return 'hostnameOverride'
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// NOTE: This function copied from pkg/util/node package to avoid external kubeadm dependency
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func GetHostname(hostnameOverride string) (string, error) {
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hostName := hostnameOverride
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if len(hostName) == 0 {
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nodeName, err := os.Hostname()
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if err != nil {
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return "", errors.Wrap(err, "couldn't determine hostname")
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}
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hostName = nodeName
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}
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// Trim whitespaces first to avoid getting an empty hostname
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// For linux, the hostname is read from file /proc/sys/kernel/hostname directly
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hostName = strings.TrimSpace(hostName)
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if len(hostName) == 0 {
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return "", errors.New("empty hostname is invalid")
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}
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return strings.ToLower(hostName), nil
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}
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