constellation/bootstrapper/internal/kubernetes/k8sapi/joinargs.go

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/*
Copyright (c) Edgeless Systems GmbH
SPDX-License-Identifier: AGPL-3.0-only
*/
package k8sapi
import (
"flag"
"fmt"
"github.com/google/shlex"
kubeadm "k8s.io/kubernetes/cmd/kubeadm/app/apis/kubeadm/v1beta3"
)
func ParseJoinCommand(joinCommand string) (*kubeadm.BootstrapTokenDiscovery, error) {
// Format:
// kubeadm join [API_SERVER_ENDPOINT] --token [TOKEN] --discovery-token-ca-cert-hash [DISCOVERY_TOKEN_CA_CERT_HASH] --control-plane
// split and verify that this is a kubeadm join command
argv, err := shlex.Split(joinCommand)
if err != nil {
return nil, fmt.Errorf("kubadm join command could not be tokenized: %v", joinCommand)
}
if len(argv) < 3 {
return nil, fmt.Errorf("kubadm join command is too short: %v", argv)
}
if argv[0] != "kubeadm" || argv[1] != "join" {
return nil, fmt.Errorf("not a kubeadm join command: %v", argv)
}
result := kubeadm.BootstrapTokenDiscovery{APIServerEndpoint: argv[2]}
var caCertHash string
// parse flags
flags := flag.NewFlagSet("", flag.ContinueOnError)
flags.StringVar(&result.Token, "token", "", "")
flags.StringVar(&caCertHash, "discovery-token-ca-cert-hash", "", "")
flags.Bool("control-plane", false, "")
flags.String("certificate-key", "", "")
if err := flags.Parse(argv[3:]); err != nil {
return nil, fmt.Errorf("parsing flag arguments: %v %w", argv, err)
}
if result.Token == "" {
return nil, fmt.Errorf("missing flag argument token: %v", argv)
}
if caCertHash == "" {
return nil, fmt.Errorf("missing flag argument discovery-token-ca-cert-hash: %v", argv)
}
result.CACertHashes = []string{caCertHash}
return &result, nil
}