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package main
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import (
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"context"
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"io/ioutil"
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"log"
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"os"
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"path"
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dockerClient "github.com/docker/docker/client"
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"github.com/mitchellh/go-homedir"
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"github.com/olekukonko/tablewriter"
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)
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// createDirIfNotExists checks for the existence of a directory and creates it along with all required parents if not.
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// It returns an error if the directory (or parents) couldn't be created and nil if it worked fine or if the path already exists.
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func createDirIfNotExists(path string) error {
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if _, err := os.Stat(path); os.IsNotExist(err) {
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return os.MkdirAll(path, os.ModePerm)
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}
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return nil
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}
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// createClusterDir creates a directory with the cluster name under $HOME/.config/k3d/<cluster_name>.
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// The cluster directory will be used e.g. to store the kubeconfig file.
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func createClusterDir(name string) {
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clusterPath, _ := getClusterDir(name)
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if err := createDirIfNotExists(clusterPath); err != nil {
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log.Fatalf("ERROR: couldn't create cluster directory [%s] -> %+v", clusterPath, err)
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}
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}
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// deleteClusterDir contrary to createClusterDir, this deletes the cluster directory under $HOME/.config/k3d/<cluster_name>
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func deleteClusterDir(name string) {
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clusterPath, _ := getClusterDir(name)
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if err := os.RemoveAll(clusterPath); err != nil {
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log.Printf("WARNING: couldn't delete cluster directory [%s]. You might want to delete it manually.", clusterPath)
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}
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}
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// getClusterDir returns the path to the cluster directory which is $HOME/.config/k3d/<cluster_name>
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func getClusterDir(name string) (string, error) {
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homeDir, err := homedir.Dir()
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if err != nil {
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log.Printf("ERROR: Couldn't get user's home directory")
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return "", err
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}
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return path.Join(homeDir, ".config", "k3d", name), nil
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}
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// printClusters prints the names of existing clusters
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func printClusters(all bool) {
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clusters, err := getClusters()
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if err != nil {
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log.Fatalf("ERROR: Couldn't list clusters -> %+v", err)
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}
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docker, err := dockerClient.NewEnvClient()
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if err != nil {
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log.Printf("WARNING: couldn't get docker info -> %+v", err)
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}
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table := tablewriter.NewWriter(os.Stdout)
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table.SetHeader([]string{"NAME", "IMAGE", "STATUS"})
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for _, cluster := range clusters {
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containerInfo, _ := docker.ContainerInspect(context.Background(), cluster)
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clusterData := []string{cluster, containerInfo.Config.Image, containerInfo.ContainerJSONBase.State.Status}
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if containerInfo.ContainerJSONBase.State.Status == "running" || all {
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table.Append(clusterData)
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}
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}
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table.Render()
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}
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// getClusters returns a list of cluster names which are folder names in the config directory
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func getClusters() ([]string, error) {
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homeDir, err := homedir.Dir()
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if err != nil {
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log.Printf("ERROR: Couldn't get user's home directory")
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return nil, err
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}
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configDir := path.Join(homeDir, ".config", "k3d")
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files, err := ioutil.ReadDir(configDir)
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if err != nil {
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log.Printf("ERROR: Couldn't list files in [%s]", configDir)
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return nil, err
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}
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clusters := []string{}
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for _, file := range files {
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if file.IsDir() {
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clusters = append(clusters, file.Name())
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}
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}
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return clusters, nil
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}
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