mirror of https://github.com/k3s-io/k3s
91 lines
3.0 KiB
Go
91 lines
3.0 KiB
Go
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/*
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Copyright 2017 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 configfiles
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import (
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"fmt"
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"path/filepath"
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"k8s.io/apimachinery/pkg/runtime/serializer"
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kubeletconfig "k8s.io/kubernetes/pkg/kubelet/apis/config"
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kubeletscheme "k8s.io/kubernetes/pkg/kubelet/apis/config/scheme"
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utilcodec "k8s.io/kubernetes/pkg/kubelet/kubeletconfig/util/codec"
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utilfs "k8s.io/kubernetes/pkg/util/filesystem"
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)
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// Loader loads configuration from a storage layer
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type Loader interface {
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// Load loads and returns the KubeletConfiguration from the storage layer, or an error if a configuration could not be loaded
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Load() (*kubeletconfig.KubeletConfiguration, error)
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}
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// fsLoader loads configuration from `configDir`
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type fsLoader struct {
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// fs is the filesystem where the config files exist; can be mocked for testing
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fs utilfs.Filesystem
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// kubeletCodecs is the scheme used to decode config files
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kubeletCodecs *serializer.CodecFactory
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// kubeletFile is an absolute path to the file containing a serialized KubeletConfiguration
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kubeletFile string
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}
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// NewFsLoader returns a Loader that loads a KubeletConfiguration from the `kubeletFile`
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func NewFsLoader(fs utilfs.Filesystem, kubeletFile string) (Loader, error) {
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_, kubeletCodecs, err := kubeletscheme.NewSchemeAndCodecs()
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if err != nil {
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return nil, err
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}
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return &fsLoader{
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fs: fs,
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kubeletCodecs: kubeletCodecs,
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kubeletFile: kubeletFile,
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}, nil
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}
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func (loader *fsLoader) Load() (*kubeletconfig.KubeletConfiguration, error) {
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data, err := loader.fs.ReadFile(loader.kubeletFile)
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if err != nil {
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return nil, fmt.Errorf("failed to read kubelet config file %q, error: %v", loader.kubeletFile, err)
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}
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// no configuration is an error, some parameters are required
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if len(data) == 0 {
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return nil, fmt.Errorf("kubelet config file %q was empty", loader.kubeletFile)
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}
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kc, err := utilcodec.DecodeKubeletConfiguration(loader.kubeletCodecs, data)
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if err != nil {
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return nil, err
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}
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// make all paths absolute
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resolveRelativePaths(kubeletconfig.KubeletConfigurationPathRefs(kc), filepath.Dir(loader.kubeletFile))
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return kc, nil
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}
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// resolveRelativePaths makes relative paths absolute by resolving them against `root`
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func resolveRelativePaths(paths []*string, root string) {
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for _, path := range paths {
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// leave empty paths alone, "no path" is a valid input
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// do not attempt to resolve paths that are already absolute
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if len(*path) > 0 && !filepath.IsAbs(*path) {
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*path = filepath.Join(root, *path)
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}
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}
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}
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