60 lines
2.0 KiB
Go
60 lines
2.0 KiB
Go
// Copyright 2019 CNI authors
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//
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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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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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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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package testutils
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import (
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"fmt"
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"os"
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"strings"
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"github.com/containernetworking/cni/pkg/types"
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)
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// TmpResolvConf will create a temporary file and write the provided DNS settings to
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// it in the resolv.conf format. It returns the path of the created temporary file or
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// an error if any occurs while creating/writing the file. It is the caller's
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// responsibility to remove the file.
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func TmpResolvConf(dnsConf types.DNS) (string, error) {
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f, err := os.CreateTemp("", "cni_test_resolv.conf")
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if err != nil {
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return "", fmt.Errorf("failed to get temp file for CNI test resolv.conf: %v", err)
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}
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defer f.Close()
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path := f.Name()
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defer func() {
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if err != nil {
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os.RemoveAll(path)
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}
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}()
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// see "man 5 resolv.conf" for the format of resolv.conf
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var resolvConfLines []string
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for _, nameserver := range dnsConf.Nameservers {
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resolvConfLines = append(resolvConfLines, fmt.Sprintf("nameserver %s", nameserver))
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}
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resolvConfLines = append(resolvConfLines, fmt.Sprintf("domain %s", dnsConf.Domain))
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resolvConfLines = append(resolvConfLines, fmt.Sprintf("search %s", strings.Join(dnsConf.Search, " ")))
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resolvConfLines = append(resolvConfLines, fmt.Sprintf("options %s", strings.Join(dnsConf.Options, " ")))
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resolvConf := strings.Join(resolvConfLines, "\n")
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_, err = f.Write([]byte(resolvConf))
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if err != nil {
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return "", fmt.Errorf("failed to write temp resolv.conf for CNI test: %v", err)
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}
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return path, err
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}
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