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kubeadm: Use loadPodSpecFromFile instead of LoadPodFromFile

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Implement and use loadPodSpecFromFile which loads and returns PodSpec object
from YAML or JSON file. Use this function in the places where LoadPodFromFile
is used to load Pod object and then return the PodSpec portion of it. This
also removes the dependency on //pkg/volume/util and its dependencies (thus,
making kubeadm more lean).

Signed-off-by: Rostislav M. Georgiev <rostislavg@vmware.com>
This commit is contained in:
Rostislav M. Georgiev 2018-05-28 15:20:03 +03:00
parent b9e46f5422
commit a4e0659815
3 changed files with 40 additions and 11 deletions
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4
cmd/kubeadm/app/phases/selfhosting/BUILD
View File

@ -17,7 +17,6 @@ go_test(
deps = [
"//cmd/kubeadm/app/constants:go_default_library",
"//cmd/kubeadm/app/util:go_default_library",
"//pkg/volume/util:go_default_library",
"//vendor/k8s.io/api/apps/v1:go_default_library",
"//vendor/k8s.io/api/core/v1:go_default_library",
],
@ -37,12 +36,13 @@ go_library(
"//cmd/kubeadm/app/features:go_default_library",
"//cmd/kubeadm/app/util:go_default_library",
"//cmd/kubeadm/app/util/apiclient:go_default_library",
"//pkg/volume/util:go_default_library",
"//vendor/github.com/golang/glog:go_default_library",
"//vendor/k8s.io/api/apps/v1:go_default_library",
"//vendor/k8s.io/api/core/v1:go_default_library",
"//vendor/k8s.io/apimachinery/pkg/apis/meta/v1:go_default_library",
"//vendor/k8s.io/apimachinery/pkg/runtime:go_default_library",
"//vendor/k8s.io/client-go/kubernetes:go_default_library",
"//vendor/k8s.io/client-go/kubernetes/scheme:go_default_library",
],
)

29
cmd/kubeadm/app/phases/selfhosting/selfhosting.go
View File

@ -18,6 +18,7 @@ package selfhosting
import (
"fmt"
"io/ioutil"
"os"
"time"
@ -26,12 +27,13 @@ import (
apps "k8s.io/api/apps/v1"
"k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/runtime"
clientset "k8s.io/client-go/kubernetes"
clientscheme "k8s.io/client-go/kubernetes/scheme"
kubeadmapi "k8s.io/kubernetes/cmd/kubeadm/app/apis/kubeadm"
kubeadmconstants "k8s.io/kubernetes/cmd/kubeadm/app/constants"
"k8s.io/kubernetes/cmd/kubeadm/app/features"
"k8s.io/kubernetes/cmd/kubeadm/app/util/apiclient"
volumeutil "k8s.io/kubernetes/pkg/volume/util"
)
const (
@ -85,12 +87,11 @@ func CreateSelfHostedControlPlane(manifestsDir, kubeConfigDir string, cfg *kubea
continue
}
// Load the Static Pod file in order to be able to create a self-hosted variant of that file
pod, err := volumeutil.LoadPodFromFile(manifestPath)
// Load the Static Pod spec in order to be able to create a self-hosted variant of that file
podSpec, err := loadPodSpecFromFile(manifestPath)
if err != nil {
return err
}
podSpec := &pod.Spec
// Build a DaemonSet object from the loaded PodSpec
ds := BuildDaemonSet(componentName, podSpec, mutators)
@ -174,3 +175,23 @@ func BuildSelfhostedComponentLabels(component string) map[string]string {
func BuildSelfHostedComponentLabelQuery(componentName string) string {
return fmt.Sprintf("k8s-app=%s", kubeadmconstants.AddSelfHostedPrefix(componentName))
}
func loadPodSpecFromFile(filePath string) (*v1.PodSpec, error) {
podDef, err := ioutil.ReadFile(filePath)
if err != nil {
return nil, fmt.Errorf("failed to read file path %s: %+v", filePath, err)
}
if len(podDef) == 0 {
return nil, fmt.Errorf("file was empty: %s", filePath)
}
codec := clientscheme.Codecs.UniversalDecoder()
pod := &v1.Pod{}
if err = runtime.DecodeInto(codec, podDef, pod); err != nil {
return nil, fmt.Errorf("failed decoding pod: %v", err)
}
return &pod.Spec, nil
}

18
cmd/kubeadm/app/phases/selfhosting/selfhosting_test.go
View File

@ -26,7 +26,6 @@ import (
apps "k8s.io/api/apps/v1"
"k8s.io/kubernetes/cmd/kubeadm/app/constants"
"k8s.io/kubernetes/cmd/kubeadm/app/util"
volumeutil "k8s.io/kubernetes/pkg/volume/util"
)
const (
@ -494,11 +493,10 @@ func TestBuildDaemonSet(t *testing.T) {
}
defer os.Remove(tempFile)
pod, err := volumeutil.LoadPodFromFile(tempFile)
podSpec, err := loadPodSpecFromFile(tempFile)
if err != nil {
t.Fatalf("couldn't load the specified Pod")
t.Fatalf("couldn't load the specified Pod Spec")
}
podSpec := &pod.Spec
ds := BuildDaemonSet(rt.component, podSpec, GetDefaultMutators())
dsBytes, err := util.MarshalToYaml(ds, apps.SchemeGroupVersion)
@ -517,6 +515,11 @@ func TestLoadPodSpecFromFile(t *testing.T) {
content string
expectError bool
}{
{
// No content
content: "",
expectError: true,
},
{
// Good YAML
content: `
@ -570,11 +573,16 @@ spec:
}
defer os.Remove(tempFile)
_, err = volumeutil.LoadPodFromFile(tempFile)
_, err = loadPodSpecFromFile(tempFile)
if (err != nil) != rt.expectError {
t.Errorf("failed TestLoadPodSpecFromFile:\nexpected error:\n%t\nsaw:\n%v", rt.expectError, err)
}
}
_, err := loadPodSpecFromFile("")
if err == nil {
t.Error("unexpected success: loadPodSpecFromFile should return error when no file is given")
}
}
func createTempFileWithContent(content []byte) (string, error) {