forked from kubicorn/kubicorn
/
kubeconfig.go
137 lines (124 loc) · 3.5 KB
/
kubeconfig.go
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// Copyright © 2017 The Kubicorn 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 kubeconfig
import (
"fmt"
"io/ioutil"
"os"
"time"
"github.com/kris-nova/kubicorn/apis/cluster"
"github.com/kris-nova/kubicorn/cutil/agent"
"github.com/kris-nova/kubicorn/cutil/local"
"github.com/kris-nova/kubicorn/cutil/logger"
"github.com/pkg/sftp"
"golang.org/x/crypto/ssh"
)
func GetConfig(existing *cluster.Cluster, sshAgent *agent.Keyring) error {
user := existing.SSH.User
pubKeyPath := local.Expand(existing.SSH.PublicKeyPath)
if existing.SSH.Port == "" {
existing.SSH.Port = "22"
}
address := fmt.Sprintf("%s:%s", existing.KubernetesAPI.Endpoint, existing.SSH.Port)
localDir := fmt.Sprintf("%s/.kube", local.Home())
localPath, err := getKubeConfigPath(localDir)
if err != nil {
return err
}
sshConfig := &ssh.ClientConfig{
User: user,
HostKeyCallback: ssh.InsecureIgnoreHostKey(),
}
remotePath := ""
if user == "root" {
remotePath = "/root/.kube/config"
} else {
remotePath = fmt.Sprintf("/home/%s/.kube/config", user)
}
// Check for key
if err := sshAgent.CheckKey(pubKeyPath); err != nil {
if keyring, err := sshAgent.AddKey(pubKeyPath); err != nil {
return err
} else {
sshAgent = keyring
}
}
if sshAgent != nil && os.Getenv("KUBICORN_FORCE_DISABLE_SSH_AGENT") == "" {
sshConfig.Auth = append(sshConfig.Auth, sshAgent.GetAgent())
}
sshConfig.SetDefaults()
conn, err := ssh.Dial("tcp", address, sshConfig)
if err != nil {
return err
}
defer conn.Close()
c, err := sftp.NewClient(conn)
if err != nil {
return err
}
defer c.Close()
r, err := c.Open(remotePath)
if err != nil {
return err
}
defer r.Close()
bytes, err := ioutil.ReadAll(r)
if err != nil {
return err
}
if _, err := os.Stat(localPath); os.IsNotExist(err) {
empty := []byte("")
err := ioutil.WriteFile(localPath, empty, 0755)
if err != nil {
return err
}
}
f, err := os.OpenFile(localPath, os.O_APPEND|os.O_WRONLY, os.ModeAppend)
if err != nil {
return err
}
_, err = f.WriteString(string(bytes))
if err != nil {
return err
}
defer f.Close()
logger.Always("Wrote kubeconfig to [%s]", localPath)
return nil
}
const (
// RetryAttempts specifies the amount of retries are allowed when getting a file from a server.
RetryAttempts = 150
// RetrySleepSeconds specifies the time to sleep after a failed attempt to get a file form a server.
RetrySleepSeconds = 5
)
func RetryGetConfig(existing *cluster.Cluster, sshAgent *agent.Keyring) error {
for i := 0; i <= RetryAttempts; i++ {
err := GetConfig(existing, sshAgent)
if err != nil {
logger.Debug("Waiting for Kubernetes to come up.. [%v]", err)
time.Sleep(time.Duration(RetrySleepSeconds) * time.Second)
continue
}
return nil
}
return fmt.Errorf("Timedout writing kubeconfig")
}
func getKubeConfigPath(path string) (string, error) {
if _, err := os.Stat(path); os.IsNotExist(err) {
if err := os.Mkdir(path, 0777); err != nil {
return "", err
}
}
return fmt.Sprintf("%s/config", path), nil
}