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shell.go
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shell.go
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package cmd
import (
"fmt"
"io"
"github.com/spf13/cobra"
"github.com/jenkins-x/jx/pkg/jx/cmd/templates"
cmdutil "github.com/jenkins-x/jx/pkg/jx/cmd/util"
"github.com/jenkins-x/jx/pkg/kube"
"k8s.io/client-go/tools/clientcmd"
"github.com/jenkins-x/jx/pkg/util"
"gopkg.in/AlecAivazis/survey.v1"
"io/ioutil"
"os"
"os/exec"
"sort"
"strings"
)
const (
bashEnvPrefix = "PS1="
defaultRcFile = `
if [ -f /etc/bashrc ]; then
source /etc/bashrc
fi
if [ -f ~/.bashrc ]; then
source ~/.bashrc
fi
`
)
type ShellOptions struct {
CommonOptions
}
var (
shell_long = templates.LongDesc(`
Create a sub shell so that changes to the kubernetes context, namespace or environment remain local to the shell.`)
shell_example = templates.Examples(`
# create a new shell where the context changes are local to the shell only
jx shell
# create a new shell using a specific named context
jx shell prod-cluster
# ends the current shell and returns to the previous kubernetes context
exit
`)
)
func NewCmdShell(f cmdutil.Factory, out io.Writer, errOut io.Writer) *cobra.Command {
options := &ShellOptions{
CommonOptions: CommonOptions{
Factory: f,
Out: out,
Err: errOut,
},
}
cmd := &cobra.Command{
Use: "shell",
Aliases: []string{"sh"},
Short: "Create a sub shell so that changes to the kubernetes context, namespace or environment remain local to the shell",
Long: shell_long,
Example: shell_example,
Run: func(cmd *cobra.Command, args []string) {
options.Cmd = cmd
options.Args = args
err := options.Run()
cmdutil.CheckErr(err)
},
}
options.addCommonFlags(cmd)
return cmd
}
func (o *ShellOptions) 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 create or connect to cluster?")
}
contextNames := []string{}
for k, v := range config.Contexts {
if k != "" && v != nil {
contextNames = append(contextNames, k)
}
}
sort.Strings(contextNames)
ctxName := ""
args := o.Args
if len(args) > 0 {
ctxName = args[0]
if util.StringArrayIndex(contextNames, ctxName) < 0 {
return util.InvalidArg(ctxName, contextNames)
}
}
if ctxName == "" && !o.BatchMode {
defaultCtxName := config.CurrentContext
pick, err := o.PickContext(contextNames, defaultCtxName)
if err != nil {
return err
}
ctxName = pick
}
if ctxName == "" {
ctxName = config.CurrentContext
}
newConfig := *config
newConfig.CurrentContext = ctxName
tmpfile, err := ioutil.TempFile("/tmp", "jx-kube-config-")
if err != nil {
return err
}
tmpFileName := tmpfile.Name()
err = clientcmd.WriteToFile(newConfig, tmpFileName)
if err != nil {
return err
}
shell := os.Getenv("SHELL")
if shell == "" {
shell = "bash"
}
prompt := o.createNewBashPrompt(os.Getenv("PS1"))
rcFile := defaultRcFile + "\nexport PS1=" + prompt + "\nexport KUBECONFIG=\"" + tmpFileName + "\"\n"
tmpRCfile, err := ioutil.TempFile("/tmp", "jx-shell-rcfile-")
if err != nil {
return err
}
tmpRCfileName := tmpRCfile.Name()
err = ioutil.WriteFile(tmpRCfileName, []byte(rcFile), util.DefaultWritePermissions)
if err != nil {
return err
}
info := util.ColorInfo
o.Printf("Creating a new shell using the kubernetes context %s\n", info(ctxName))
o.Printf("Bash RC file is %s\n\n", tmpRCfileName)
o.Printf("All changes to the kuberentes context like changing environment, namespace or context will be local to this shell\n")
o.Printf("To return to the global context use the command: exit\n\n")
e := exec.Command(shell, "-rcfile", tmpRCfileName, "-i")
e.Stdout = o.Out
e.Stderr = o.Err
e.Stdin = os.Stdin
return e.Run()
}
func (o *ShellOptions) 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 (o *ShellOptions) createNewBashPrompt(prompt string) string {
if prompt == "" {
return "[\\u@\\h \\W \\$(jx prompt) ]\\$ "
}
if strings.Contains(prompt, "jx prompt") {
return prompt
}
if prompt[0] == '"' {
return prompt[0:1] + "\\$(jx prompt) " + prompt[1:]
}
if prompt[0] == '\'' {
return prompt[0:1] + "$(jx prompt) " + prompt[1:]
}
return "'$(jx prompt) " + prompt + "'"
}