package context import ( "fmt" "os" "github.com/docker/cli/cli/command" "github.com/docker/cli/cli/context/store" "github.com/docker/docker/client" "github.com/spf13/cobra" ) func newUseCommand(dockerCli command.Cli) *cobra.Command { cmd := &cobra.Command{ Use: "use CONTEXT", Short: "Set the current docker context", Args: cobra.ExactArgs(1), RunE: func(cmd *cobra.Command, args []string) error { name := args[0] return RunUse(dockerCli, name) }, } return cmd } // RunUse set the current Docker context func RunUse(dockerCli command.Cli, name string) error { if err := store.ValidateContextName(name); err != nil && name != "default" { return err } if _, err := dockerCli.ContextStore().GetMetadata(name); err != nil && name != "default" { return err } configValue := name if configValue == "default" { configValue = "" } dockerConfig := dockerCli.ConfigFile() dockerConfig.CurrentContext = configValue if err := dockerConfig.Save(); err != nil { return err } fmt.Fprintln(dockerCli.Out(), name) fmt.Fprintf(dockerCli.Err(), "Current context is now %q\n", name) if os.Getenv(client.EnvOverrideHost) != "" { fmt.Fprintf(dockerCli.Err(), "Warning: %[1]s environment variable overrides the active context. "+ "To use %[2]q, either set the global --context flag, or unset %[1]s environment variable.\n", client.EnvOverrideHost, name) } return nil }