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/*
Copyright 2018 The Kubernetes Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package upgrade
import (
"fmt"
"io"
"io/ioutil"
"github.com/golang/glog"
"github.com/pmezard/go-difflib/difflib"
"github.com/spf13/cobra"
corev1 "k8s.io/api/core/v1"
kubeadmv1alpha2 "k8s.io/kubernetes/cmd/kubeadm/app/apis/kubeadm/v1alpha2"
cmdutil "k8s.io/kubernetes/cmd/kubeadm/app/cmd/util"
"k8s.io/kubernetes/cmd/kubeadm/app/constants"
"k8s.io/kubernetes/cmd/kubeadm/app/phases/controlplane"
kubeadmutil "k8s.io/kubernetes/cmd/kubeadm/app/util"
configutil "k8s.io/kubernetes/cmd/kubeadm/app/util/config"
"k8s.io/kubernetes/pkg/util/version"
)
type diffFlags struct {
apiServerManifestPath string
controllerManagerManifestPath string
schedulerManifestPath string
newK8sVersionStr string
contextLines int
cfgPath string
out io.Writer
}
var (
defaultAPIServerManifestPath = constants.GetStaticPodFilepath(constants.KubeAPIServer, constants.GetStaticPodDirectory())
defaultControllerManagerManifestPath = constants.GetStaticPodFilepath(constants.KubeControllerManager, constants.GetStaticPodDirectory())
defaultSchedulerManifestPath = constants.GetStaticPodFilepath(constants.KubeScheduler, constants.GetStaticPodDirectory())
)
// NewCmdDiff returns the cobra command for `kubeadm upgrade diff`
func NewCmdDiff(out io.Writer) *cobra.Command {
flags := &diffFlags{
out: out,
}
cmd := &cobra.Command{
Use: "diff [version]",
Short: "Show what differences would be applied to existing static pod manifests. See also: kubeadm upgrade apply --dry-run",
Run: func(cmd *cobra.Command, args []string) {
// TODO: Run preflight checks for diff to check that the manifests already exist.
kubeadmutil.CheckErr(runDiff(flags, args))
},
}
// TODO: Use the generic options.AddConfigFlag method instead
cmd.Flags().StringVar(&flags.cfgPath, "config", flags.cfgPath, "Path to kubeadm config file. WARNING: Usage of a configuration file is experimental!")
cmd.Flags().StringVar(&flags.apiServerManifestPath, "api-server-manifest", defaultAPIServerManifestPath, "path to API server manifest")
cmd.Flags().StringVar(&flags.controllerManagerManifestPath, "controller-manager-manifest", defaultControllerManagerManifestPath, "path to controller manifest")
cmd.Flags().StringVar(&flags.schedulerManifestPath, "scheduler-manifest", defaultSchedulerManifestPath, "path to scheduler manifest")
cmd.Flags().IntVarP(&flags.contextLines, "context-lines", "c", 3, "How many lines of context in the diff")
return cmd
}
func runDiff(flags *diffFlags, args []string) error {
// If the version is specified in config file, pick up that value.
glog.V(1).Infof("fetching configuration from file", flags.cfgPath)
cfg, err := configutil.ConfigFileAndDefaultsToInternalConfig(flags.cfgPath, &kubeadmv1alpha2.MasterConfiguration{})
if err != nil {
return err
}
if cfg.KubernetesVersion != "" {
flags.newK8sVersionStr = cfg.KubernetesVersion
}
// If the new version is already specified in config file, version arg is optional.
if flags.newK8sVersionStr == "" {
if err := cmdutil.ValidateExactArgNumber(args, []string{"version"}); err != nil {
return err
}
}
// If option was specified in both args and config file, args will overwrite the config file.
if len(args) == 1 {
flags.newK8sVersionStr = args[0]
}
k8sVer, err := version.ParseSemantic(flags.newK8sVersionStr)
if err != nil {
return err
}
specs := controlplane.GetStaticPodSpecs(cfg, k8sVer)
for spec, pod := range specs {
var path string
switch spec {
case constants.KubeAPIServer:
path = flags.apiServerManifestPath
case constants.KubeControllerManager:
path = flags.controllerManagerManifestPath
case constants.KubeScheduler:
path = flags.schedulerManifestPath
default:
glog.Errorf("[diff] unknown spec %v", spec)
continue
}
newManifest, err := kubeadmutil.MarshalToYaml(&pod, corev1.SchemeGroupVersion)
if err != nil {
return err
}
if path == "" {
return fmt.Errorf("empty manifest path")
}
existingManifest, err := ioutil.ReadFile(path)
if err != nil {
return err
}
// Populated and write out the diff
diff := difflib.UnifiedDiff{
A: difflib.SplitLines(string(existingManifest)),
B: difflib.SplitLines(string(newManifest)),
FromFile: path,
ToFile: "new manifest",
Context: flags.contextLines,
}
difflib.WriteUnifiedDiff(flags.out, diff)
}
return nil
}
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