282 lines
5.9 KiB
Go
282 lines
5.9 KiB
Go
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package entrypoint
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import (
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"bytes"
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crypticnet "cryptic-net"
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"cryptic-net/bootstrap"
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"cryptic-net/garage"
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"cryptic-net/tarutil"
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"errors"
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"fmt"
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"io/fs"
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"net"
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"os"
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"path/filepath"
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"regexp"
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"github.com/minio/minio-go/v7"
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"gopkg.in/yaml.v3"
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)
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const nebulaHostPathPrefix = "nebula/hosts/"
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func nebulaHostPath(name string) string {
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return filepath.Join(nebulaHostPathPrefix, name+".yml")
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}
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var hostNameRegexp = regexp.MustCompile(`^[a-z][a-z0-9\-]*$`)
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func validateHostName(name string) error {
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if !hostNameRegexp.MatchString(name) {
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return errors.New("a host's name must start with a letter and only contain letters, numbers, and dashes")
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}
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return nil
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}
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var subCmdHostsAdd = subCmd{
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name: "add",
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descr: "Adds a host to the network",
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checkLock: true,
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do: func(subCmdCtx subCmdCtx) error {
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flags := subCmdCtx.flagSet(false)
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name := flags.StringP(
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"name", "n", "",
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"Name of the new host",
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)
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ip := flags.StringP(
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"ip", "i", "",
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"IP of the new host",
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)
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if err := flags.Parse(subCmdCtx.args); err != nil {
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return fmt.Errorf("parsing flags: %w", err)
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}
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if *name == "" || *ip == "" {
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return errors.New("--name and --ip are required")
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}
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if err := validateHostName(*name); err != nil {
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return fmt.Errorf("invalid hostname %q: %w", *name, err)
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}
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if net.ParseIP(*ip) == nil {
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return fmt.Errorf("invalid ip %q", *ip)
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}
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// TODO validate that the IP is in the correct CIDR
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env := subCmdCtx.env
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client, err := garage.GlobalBucketAPIClient(env)
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if err != nil {
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return fmt.Errorf("creating client for global bucket: %w", err)
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}
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nebulaHost := crypticnet.NebulaHost{
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Name: *name,
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IP: *ip,
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}
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bodyBuf := new(bytes.Buffer)
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if err := yaml.NewEncoder(bodyBuf).Encode(nebulaHost); err != nil {
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return fmt.Errorf("marshaling nebula host to yaml: %w", err)
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}
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filePath := nebulaHostPath(*name)
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_, err = client.PutObject(
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env.Context, garage.GlobalBucket, filePath,
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bodyBuf, int64(bodyBuf.Len()),
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minio.PutObjectOptions{},
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)
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if err != nil {
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return fmt.Errorf("writing to %q in global bucket: %w", filePath, err)
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}
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return nil
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},
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}
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var subCmdHostsList = subCmd{
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name: "list",
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descr: "Lists all hosts in the network, and their IPs",
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checkLock: true,
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do: func(subCmdCtx subCmdCtx) error {
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env := subCmdCtx.env
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client, err := garage.GlobalBucketAPIClient(env)
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if err != nil {
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return fmt.Errorf("creating client for global bucket: %w", err)
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}
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objInfoCh := client.ListObjects(
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env.Context, garage.GlobalBucket,
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minio.ListObjectsOptions{
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Prefix: nebulaHostPathPrefix,
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},
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)
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for {
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select {
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case <-env.Context.Done():
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return env.Context.Err()
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case objInfo, ok := <-objInfoCh:
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if !ok {
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return nil
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} else if objInfo.Err != nil {
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return objInfo.Err
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}
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obj, err := client.GetObject(
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env.Context, garage.GlobalBucket, objInfo.Key,
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minio.GetObjectOptions{},
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)
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if err != nil {
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return fmt.Errorf("retrieving object %q from global bucket: %w", objInfo.Key, err)
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}
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var nebulaHost crypticnet.NebulaHost
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err = yaml.NewDecoder(obj).Decode(&nebulaHost)
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obj.Close()
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if err != nil {
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return fmt.Errorf("yaml decoding %q from global bucket: %w", objInfo.Key, err)
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}
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fmt.Fprintf(
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os.Stdout, "%s\t%s\n",
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nebulaHost.Name, nebulaHost.IP,
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)
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}
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}
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},
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}
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var subCmdHostsDelete = subCmd{
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name: "delete",
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descr: "Deletes a host from the network",
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checkLock: true,
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do: func(subCmdCtx subCmdCtx) error {
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flags := subCmdCtx.flagSet(false)
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name := flags.StringP(
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"name", "n", "",
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"Name of the new host",
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)
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if err := flags.Parse(subCmdCtx.args); err != nil {
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return fmt.Errorf("parsing flags: %w", err)
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}
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if *name == "" {
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return errors.New("--name is required")
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}
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env := subCmdCtx.env
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filePath := nebulaHostPath(*name)
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client, err := garage.GlobalBucketAPIClient(env)
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if err != nil {
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return fmt.Errorf("creating client for global bucket: %w", err)
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}
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err = client.RemoveObject(
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env.Context, garage.GlobalBucket, filePath,
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minio.RemoveObjectOptions{},
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)
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if garage.IsKeyNotFound(err) {
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return fmt.Errorf("host %q not found", *name)
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} else if err != nil {
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return fmt.Errorf("removing object %q from global bucket: %w", filePath, err)
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}
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return nil
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},
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}
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func readAdminFS(path string) (fs.FS, error) {
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if path == "-" {
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outFS, err := tarutil.FSFromReader(os.Stdin)
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if err != nil {
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return nil, fmt.Errorf("reading admin.tgz from stdin: %w", err)
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}
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return outFS, nil
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}
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f, err := os.Open(path)
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if err != nil {
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return nil, fmt.Errorf("opening file: %w", err)
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}
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defer f.Close()
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return tarutil.FSFromReader(f)
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}
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var subCmdHostsMakeBootstrap = subCmd{
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name: "make-bootstrap",
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descr: "Creates a new bootstrap.tgz file for a particular host and writes it to stdout",
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checkLock: true,
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do: func(subCmdCtx subCmdCtx) error {
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flags := subCmdCtx.flagSet(false)
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name := flags.StringP(
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"name", "n", "",
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"Name of the host to generate bootstrap.tgz for",
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)
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adminPath := flags.StringP(
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"admin-path", "a", "",
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`Path to admin.tgz file. If the given path is "-" then stdin is used.`,
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)
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if err := flags.Parse(subCmdCtx.args); err != nil {
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return fmt.Errorf("parsing flags: %w", err)
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}
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if *name == "" || *adminPath == "" {
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return errors.New("--name and --admin-path are required")
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}
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adminFS, err := readAdminFS(*adminPath)
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if err != nil {
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return fmt.Errorf("reading admin.tgz with --admin-path of %q: %w", *adminPath, err)
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}
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return bootstrap.NewForHost(subCmdCtx.env, adminFS, *name, os.Stdout)
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},
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}
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var subCmdHosts = subCmd{
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name: "hosts",
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descr: "Sub-commands having to do with configuration of hosts in the network",
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do: func(subCmdCtx subCmdCtx) error {
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return subCmdCtx.doSubCmd(
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subCmdHostsAdd,
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subCmdHostsList,
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subCmdHostsDelete,
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subCmdHostsMakeBootstrap,
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)
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},
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}
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