/
shell.go
210 lines (183 loc) · 4.97 KB
/
shell.go
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package shellcmd
import (
"fmt"
"io/ioutil"
"os"
"os/exec"
"path/filepath"
"sort"
"strings"
"k8s.io/client-go/tools/clientcmd/api"
"github.com/plumming/dx/pkg/kube"
"github.com/plumming/dx/pkg/util"
"github.com/spf13/cobra"
"gopkg.in/AlecAivazis/survey.v1"
"k8s.io/client-go/tools/clientcmd"
)
type ShellCmd struct {
Filter string
Cmd *cobra.Command
Args []string
}
const (
defaultPromptCommand = "dx prompt"
defaultRcFile = `
if [ -f /etc/bashrc ]; then
source /etc/bashrc
fi
if [ -f ~/.bashrc ]; then
source ~/.bashrc
fi
`
zshRcFile = `
if [ -f /etc/zshrc ]; then
source /etc/zshrc
fi
if [ -f ~/.zshrc ]; then
source ~/.zshrc
fi
`
)
func NewShellCmd() *cobra.Command {
c := &ShellCmd{}
cmd := &cobra.Command{
Use: "shell",
Short: "Launch a new shell with a copy of the current kubernetes config",
Long: "",
Example: "dx shell",
Aliases: []string{"sh", "s"},
RunE: func(cmd *cobra.Command, args []string) error {
c.Cmd = cmd
c.Args = args
return c.Run()
},
Args: cobra.NoArgs,
}
cmd.Flags().StringVarP(&c.Filter, "filter", "f", "", "Filter the list of contexts to switch between using the given text")
return cmd
}
func (c *ShellCmd) Run() error {
config, _, err := kube.LoadConfig()
if err != nil {
return err
}
if config == nil || config.Contexts == nil || len(config.Contexts) == 0 {
return fmt.Errorf("no kubernetes contexts available! try to create or connect to cluster")
}
contextNames := c.filterContexts(config)
ctxName := ""
defaultCtxName := config.CurrentContext
pick, err := c.PickContext(contextNames, defaultCtxName)
if err != nil {
return err
}
ctxName = pick
newConfig := *config
newConfig.CurrentContext = ctxName
c.cleanup()
tmpDirName, err := ioutil.TempDir("/tmp", ".dx-shell-")
if err != nil {
return err
}
tmpConfigFileName := tmpDirName + "/config"
err = clientcmd.WriteToFile(newConfig, tmpConfigFileName)
if err != nil {
return err
}
shell := filepath.Base(os.Getenv("SHELL"))
prompt := c.createNewBashPrompt(os.Getenv("PS1"))
rcFile := defaultRcFile + "\nexport PS1=" + prompt + "\nexport KUBECONFIG=\"" + tmpConfigFileName + "\"\n"
tmpRCFileName := tmpDirName + "/.bashrc"
if shell == "zsh" {
prompt = c.createNewZshPrompt(os.Getenv("PS1"))
rcFile = zshRcFile + "\nexport PS1=" + prompt + "\nexport KUBECONFIG=\"" + tmpConfigFileName + "\"\n"
tmpRCFileName = tmpDirName + "/.zshrc"
}
err = os.WriteFile(tmpRCFileName, []byte(rcFile), 0600)
if err != nil {
return err
}
info := util.ColorInfo
fmt.Printf("Creating a new shell using the Kubernetes context %s\n", info(ctxName))
fmt.Printf("Shell RC file is %s\n\n", tmpRCFileName)
fmt.Printf("All changes to the Kubernetes context like changing environment, namespace or context will be local to this shell\n")
fmt.Printf("To return to the global context use the command: exit\n\n")
e := exec.Command(shell, "-rcfile", tmpRCFileName, "-i")
if shell == "zsh" {
env := os.Environ()
env = append(env, fmt.Sprintf("ZDOTDIR=%s", tmpDirName))
e = exec.Command(shell, "-i")
e.Env = env
}
return e.Run()
}
func (c *ShellCmd) filterContexts(config *api.Config) []string {
var contextNames []string
for k, v := range config.Contexts {
if k != "" && v != nil {
if c.Filter == "" || strings.Contains(k, c.Filter) {
contextNames = append(contextNames, k)
}
}
}
sort.Strings(contextNames)
return contextNames
}
func (c *ShellCmd) cleanup() {
//clean old folders
files, err := filepath.Glob("/tmp/.dx-shell-*")
if err != nil {
panic(err)
}
for _, f := range files {
if err := os.RemoveAll(f); err != nil {
panic(err)
}
}
}
func (c *ShellCmd) PickContext(names []string, defaultValue string) (string, error) {
if len(names) == 0 {
return "", nil
}
if len(names) == 1 {
return names[0], nil
}
name := ""
prompt := &survey.Select{
Message: "Change Kubernetes context:",
Options: names,
Default: defaultValue,
}
err := survey.AskOne(prompt, &name, nil)
return name, err
}
func (c *ShellCmd) createNewBashPrompt(prompt string) string {
if prompt == "" {
return fmt.Sprintf("'[\\u@\\h \\W \\$(%s) ]\\$ '", defaultPromptCommand)
}
if strings.Contains(prompt, defaultPromptCommand) {
return prompt
}
if prompt[0] == '"' {
return prompt[0:1] + fmt.Sprintf("\\$(%s) ", defaultPromptCommand) + prompt[1:]
}
if prompt[0] == '\'' {
return prompt[0:1] + fmt.Sprintf("$(%s) ", defaultPromptCommand) + prompt[1:]
}
return fmt.Sprintf("'$(%s) ", defaultPromptCommand) + prompt + "'"
}
func (c *ShellCmd) createNewZshPrompt(prompt string) string {
if prompt == "" {
return fmt.Sprintf("'[$(%s) %%n@%%m %%c]\\$ '", defaultPromptCommand)
}
if strings.Contains(prompt, defaultPromptCommand) {
return prompt
}
if prompt[0] == '"' {
return prompt[0:1] + fmt.Sprintf("$(%s) ", defaultPromptCommand) + prompt[1:]
}
if prompt[0] == '\'' {
return prompt[0:1] + fmt.Sprintf("$(%s) ", defaultPromptCommand) + prompt[1:]
}
return fmt.Sprintf("'$(%s) ", defaultPromptCommand) + prompt + "'"
}