mirror of https://github.com/kubernetes/kops.git
93 lines
2.8 KiB
Go
93 lines
2.8 KiB
Go
/*
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Copyright 2019 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 channels
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import (
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"fmt"
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"os"
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"os/exec"
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"path"
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"strings"
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"k8s.io/klog/v2"
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)
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// Apply calls kubectl apply to apply the manifest.
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// We will likely in future change this to create things directly (or more likely embed this logic into kubectl itself)
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func Apply(data []byte) error {
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// We copy the manifest to a temp file because it is likely e.g. an s3 URL, which kubectl can't read
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tmpDir, err := os.MkdirTemp("", "channel")
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if err != nil {
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return fmt.Errorf("error creating temp dir: %v", err)
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}
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defer func() {
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if err := os.RemoveAll(tmpDir); err != nil {
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klog.Warningf("error deleting temp dir %q: %v", tmpDir, err)
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}
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}()
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localManifestFile := path.Join(tmpDir, "manifest.yaml")
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if err := os.WriteFile(localManifestFile, data, 0o600); err != nil {
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return fmt.Errorf("error writing temp file: %v", err)
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}
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// First do an apply. This may fail when removing things from lists/arrays and required fields are not removed.
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{
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_, err := execKubectl("apply", "-f", localManifestFile, "--server-side", "--force-conflicts", "--field-manager=kops")
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if err != nil {
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klog.Errorf("failed to apply the manifest: %v", err)
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}
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}
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// Replace will force ownership on all fields to kops. But on some k8s versions, this will fail on e.g trying to set clusterIP to "".
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{
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_, err := execKubectl("replace", "-f", localManifestFile, "--field-manager=kops")
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if err != nil {
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klog.Errorf("failed to replace manifest: %v", err)
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}
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}
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// Do a final replace to ensure resources are correctly apply. This should always succeed if the addon is updated as expected.
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{
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_, err := execKubectl("apply", "-f", localManifestFile, "--server-side", "--force-conflicts", "--field-manager=kops")
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if err != nil {
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return fmt.Errorf("failed to apply the manifest: %w", err)
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}
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}
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return nil
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}
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func execKubectl(args ...string) (string, error) {
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kubectlPath := "kubectl" // Assume in PATH
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cmd := exec.Command(kubectlPath, args...)
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env := os.Environ()
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cmd.Env = env
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human := strings.Join(cmd.Args, " ")
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klog.V(2).Infof("Running command: %s", human)
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output, err := cmd.CombinedOutput()
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if err != nil {
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klog.Infof("error running %s", human)
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klog.Info(string(output))
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return string(output), fmt.Errorf("error running kubectl: %v", err)
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}
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return string(output), err
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}
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