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bootstrap.go
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bootstrap.go
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// Copyright 2016 Mirantis
//
// 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 cmd
import (
"bufio"
"encoding/json"
"fmt"
"log"
"os"
"regexp"
"strconv"
"github.com/Mirantis/k8s-AppController/pkg/client"
"github.com/spf13/cobra"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/pkg/api/errors"
"k8s.io/client-go/pkg/apis/extensions/v1beta1"
)
// KubernetesRequiredMajorVersion is minimal required major version of Kubernetes cluster
const KubernetesRequiredMajorVersion = 1
// KubernetesRequiredMinorVersion is minimal required minor version of Kubernetes cluster
const KubernetesRequiredMinorVersion = 4
func getFileContents(stream *os.File) string {
result := ""
scanner := bufio.NewScanner(stream)
for scanner.Scan() {
result += scanner.Text() + "\n"
}
return result
}
func createTPRIfNotExists(tpr v1beta1.ThirdPartyResource, client kubernetes.Interface) {
_, err := client.Extensions().ThirdPartyResources().Create(&tpr)
switch err.(type) {
case (*errors.StatusError):
e := err.(*errors.StatusError)
if e.ErrStatus.Code != 409 {
log.Fatal(e)
} else {
log.Printf("%s already exists, skipping", e.ErrStatus.Details.Name)
}
case nil:
log.Printf("Created %s", tpr.ObjectMeta.Name)
default:
log.Fatal(err)
}
return
}
func getDependencyFromPath(path string) v1beta1.ThirdPartyResource {
file, err := os.Open(path)
if err != nil {
log.Fatal(err)
}
var tpr v1beta1.ThirdPartyResource
err = json.Unmarshal([]byte(getFileContents(file)), &tpr)
if err != nil {
log.Fatal(err)
}
return tpr
}
func checkVersion(c kubernetes.Interface) {
v, err := c.Discovery().ServerVersion()
if err != nil {
log.Fatal(err)
}
re := regexp.MustCompile("[0-9]+")
major, err := strconv.Atoi(re.FindString(v.Major))
if err != nil {
log.Fatal(err)
}
minor, err := strconv.Atoi(re.FindString(v.Minor))
if err != nil {
log.Fatal(err)
}
if major < KubernetesRequiredMajorVersion || (major == KubernetesRequiredMajorVersion && minor < KubernetesRequiredMinorVersion) {
log.Fatal(fmt.Errorf("AppController is not compatible with Kubernetes version older than %d.%d", KubernetesRequiredMajorVersion, KubernetesRequiredMinorVersion))
}
}
func bootstrap(cmd *cobra.Command, args []string) {
thirdPartyResourcesPath := os.Args[2]
url := os.Getenv("KUBERNETES_CLUSTER_URL")
config, err := client.GetConfig(url)
if err != nil {
log.Fatal(err)
}
c, err := kubernetes.NewForConfig(config)
if err != nil {
log.Fatal(err)
}
checkVersion(c)
manifests := [...]string{"dependencies.json", "resdefs.json", "replicas.json"}
for _, manifest := range manifests {
dependency := getDependencyFromPath(thirdPartyResourcesPath + "/" + manifest)
createTPRIfNotExists(dependency, c)
}
}
// Bootstrap is cobra command for bootstrapping AppController, meant to be run in an init container
var Bootstrap = &cobra.Command{
Use: "bootstrap",
Short: "Bootstrap AppController",
Long: "Create ThirdPartyResources required for AppController pod to function properly",
Run: bootstrap,
}