DockerCLI/cli/command/node/cmd.go

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package node
import (
"errors"
"github.com/docker/cli/cli"
"github.com/docker/cli/cli/command"
"github.com/docker/docker/api/types"
apiclient "github.com/docker/docker/client"
"github.com/spf13/cobra"
"golang.org/x/net/context"
)
// NewNodeCommand returns a cobra command for `node` subcommands
func NewNodeCommand(dockerCli command.Cli) *cobra.Command {
cmd := &cobra.Command{
Use: "node",
Short: "Manage Swarm nodes",
Args: cli.NoArgs,
RunE: command.ShowHelp(dockerCli.Err()),
Tags: map[string]string{"version": "1.24"},
}
cmd.AddCommand(
newDemoteCommand(dockerCli),
newInspectCommand(dockerCli),
newListCommand(dockerCli),
newPromoteCommand(dockerCli),
newRemoveCommand(dockerCli),
newPsCommand(dockerCli),
newUpdateCommand(dockerCli),
)
return cmd
}
// Reference returns the reference of a node. The special value "self" for a node
// reference is mapped to the current node, hence the node ID is retrieved using
// the `/info` endpoint.
func Reference(ctx context.Context, client apiclient.APIClient, ref string) (string, error) {
if ref == "self" {
info, err := client.Info(ctx)
if err != nil {
return "", err
}
if info.Swarm.NodeID == "" {
// If there's no node ID in /info, the node probably
// isn't a manager. Call a swarm-specific endpoint to
// get a more specific error message.
_, err = client.NodeList(ctx, types.NodeListOptions{})
if err != nil {
return "", err
}
return "", errors.New("node ID not found in /info")
}
return info.Swarm.NodeID, nil
}
return ref, nil
}