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main.go
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main.go
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package main
import (
"fmt"
"io/ioutil"
"os"
"path/filepath"
"gopkg.in/yaml.v2"
)
type kubeconfig struct {
APIVersion string `yaml:"apiVersion"`
Kind string `yaml:"kind"`
Clusters []struct {
Name string `yaml:"name"`
Cluster struct {
Server string `yaml:"server"`
CertificateAuthorityData string `yaml:"certificate-authority-data"`
} `yaml:"cluster"`
} `yaml:"clusters"`
Contexts []struct {
Name string `yaml:"name"`
Context struct {
Cluster string `yaml:"cluster"`
Namespace string `yaml:"namespace"`
User string `yaml:"user"`
} `yaml:"context"`
} `yaml:"contexts"`
Users []struct {
Name string `yaml:"name"`
User struct {
ClientCertificateData string `yaml:"client-certificate-data"`
ClientKeyData string `yaml:"client-key-data"`
Username string `yaml:"username"`
Password string `yaml:"password"`
} `yaml:"user"`
} `yaml:"users"`
}
func main() {
if len(os.Args) != 3 {
fmt.Println("Usage: kubeconfig-merger <first-file> <second-file>")
os.Exit(1)
}
// Load first kubeconfig file
firstKubeConfig, err := loadKubeConfig(os.Args[1])
if err != nil {
fmt.Println("Error loading first kubeconfig file:", err)
os.Exit(1)
}
// Load second kubeconfig file
secondKubeConfig, err := loadKubeConfig(os.Args[2])
if err != nil {
fmt.Println("Error loading second kubeconfig file:", err)
os.Exit(1)
}
for _, firstCluster := range firstKubeConfig.Clusters {
for _, secondCluster := range secondKubeConfig.Clusters {
if firstCluster.Name == secondCluster.Name {
fmt.Printf("Error: Both kubeconfigs have a cluster named '%s'\n", firstCluster.Name)
os.Exit(1)
}
}
}
// if hasDefaultCluster(firstKubeConfig) && hasDefaultCluster(secondKubeConfig) {
// fmt.Println("Both kubeconfig files contain a cluster named 'default'")
// os.Exit(1)
// }
// Concatenate clusters
for _, cluster := range secondKubeConfig.Clusters {
firstKubeConfig.Clusters = append(firstKubeConfig.Clusters, cluster)
}
// Concatenate contexts
for _, context := range secondKubeConfig.Contexts {
firstKubeConfig.Contexts = append(firstKubeConfig.Contexts, context)
}
// Concatenate users
for _, user := range secondKubeConfig.Users {
firstKubeConfig.Users = append(firstKubeConfig.Users, user)
}
// Write concatenated kubeconfig file
err = writeKubeConfig("combined-kubeconfig.yaml", firstKubeConfig)
if err != nil {
fmt.Println("Error writing combined kubeconfig file:", err)
os.Exit(1)
}
fmt.Println("Kubeconfig files combined successfully!")
}
func loadKubeConfig(filename string) (*kubeconfig, error) {
// Read kubeconfig file
data, err := ioutil.ReadFile(filepath.Clean(filename))
if err != nil {
return nil, err
}
// Parse kubeconfig file
kc := kubeconfig{}
err = yaml.Unmarshal(data, &kc)
if err != nil {
return nil, err
}
return &kc, nil
}
func writeKubeConfig(filename string, kc *kubeconfig) error {
// Convert kubeconfig to YAML
data, err := yaml.Marshal(kc)
if err != nil {
return err
}
// Write YAML to file
err = ioutil.WriteFile(filepath.Clean(filename), data, 0644)
if err != nil {
return err
}
return nil
}
//func hasDefaultCluster(kc *kubeconfig) bool {
// for _, cluster := range kc.Clusters {
// if cluster.Name == "default" {
// return true
// }
// }
// return false
//}