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77 lines
3.0 KiB
Go
77 lines
3.0 KiB
Go
/*
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Copyright 2021 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 componentconfigs
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import (
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"os"
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"path/filepath"
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"strings"
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"github.com/pkg/errors"
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"k8s.io/klog/v2"
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kubeletconfig "k8s.io/kubelet/config/v1beta1"
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utilpointer "k8s.io/utils/pointer"
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)
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// Mutate modifies absolute path fields in the KubeletConfiguration to be Windows compatible absolute paths.
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func (kc *kubeletConfig) Mutate() error {
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// When "kubeadm join" downloads the KubeletConfiguration from the cluster on Windows
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// nodes, it would contain absolute paths that may lack drive letters, since the config
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// could have been generated on a Linux control-plane node. On Windows the
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// Golang path.IsAbs() function returns false unless the path contains a drive letter.
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// This trips client-go and the kubelet, creating problems on Windows nodes.
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// Fixing it in client-go or the kubelet is a breaking change to existing Windows
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// users that rely on relative paths:
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// https://github.com/kubernetes/kubernetes/pull/77710#issuecomment-491989621
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//
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// Thus, a workaround here is to adapt the KubeletConfiguration paths for Windows.
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// Note this is currently bound to KubeletConfiguration v1beta1.
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klog.V(2).Infoln("[componentconfig] Adapting the paths in the KubeletConfiguration for Windows...")
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// Get the drive from where the kubeadm binary was called.
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exe, err := os.Executable()
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if err != nil {
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return errors.Wrap(err, "could not obtain information about the kubeadm executable")
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}
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drive := filepath.VolumeName(filepath.Dir(exe))
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klog.V(2).Infof("[componentconfig] Assuming Windows drive %q", drive)
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// Mutate the paths in the config.
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mutatePaths(&kc.config, drive)
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return nil
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}
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func mutatePaths(cfg *kubeletconfig.KubeletConfiguration, drive string) {
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mutateStringField := func(name string, field *string) {
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// path.IsAbs() is not reliable here in the Windows runtime, so check if the
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// path starts with "/" instead. This means the path originated from a Unix node and
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// is an absolute path.
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if !strings.HasPrefix(*field, "/") {
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return
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}
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// Prepend the drive letter to the path and update the field.
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*field = filepath.Join(drive, *field)
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klog.V(2).Infof("[componentconfig] kubelet/Windows: adapted path for field %q to %q", name, *field)
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}
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// Mutate the fields we care about.
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klog.V(2).Infof("[componentconfig] kubelet/Windows: changing field \"resolverConfig\" to empty")
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cfg.ResolverConfig = utilpointer.String("")
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mutateStringField("staticPodPath", &cfg.StaticPodPath)
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mutateStringField("authentication.x509.clientCAFile", &cfg.Authentication.X509.ClientCAFile)
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}
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