manager

Documentation

Index

• Constants
• func AddPluginCommandStubs(dockerCli command.Cli, rootCmd *cobra.Command) (err error)
• func IsNotFound(err error) bool
• func IsPluginCommand(cmd *cobra.Command) bool
• func NewPluginError(msg string, args ...any) error
• func PluginRunCommand(dockerCli command.Cli, name string, rootcmd *cobra.Command) (*exec.Cmd, error)
• func RunCLICommandHooks(dockerCli command.Cli, rootCmd, subCommand *cobra.Command, ...)
• func RunPluginHooks(dockerCli command.Cli, rootCmd, subCommand *cobra.Command, args []string)
• type Candidate
• type HookPluginData
• type Metadata
• type Plugin
  • func GetPlugin(name string, dockerCli command.Cli, rootcmd *cobra.Command) (*Plugin, error)
  • func ListPlugins(dockerCli command.Cli, rootcmd *cobra.Command) ([]Plugin, error)
  • func (p *Plugin) RunHook(hookData HookPluginData) ([]byte, error)

Constants

const (
	// CommandAnnotationPlugin is added to every stub command added by
	// AddPluginCommandStubs with the value "true" and so can be
	// used to distinguish plugin stubs from regular commands.
	CommandAnnotationPlugin = "com.docker.cli.plugin"

	// CommandAnnotationPluginVendor is added to every stub command
	// added by AddPluginCommandStubs and contains the vendor of
	// that plugin.
	CommandAnnotationPluginVendor = "com.docker.cli.plugin.vendor"

	// CommandAnnotationPluginVersion is added to every stub command
	// added by AddPluginCommandStubs and contains the version of
	// that plugin.
	CommandAnnotationPluginVersion = "com.docker.cli.plugin.version"

	// CommandAnnotationPluginInvalid is added to any stub command
	// added by AddPluginCommandStubs for an invalid command (that
	// is, one which failed it's candidate test) and contains the
	// reason for the failure.
	CommandAnnotationPluginInvalid = "com.docker.cli.plugin-invalid"

	// CommandAnnotationPluginCommandPath is added to overwrite the
	// command path for a plugin invocation.
	CommandAnnotationPluginCommandPath = "com.docker.cli.plugin.command_path"
)

const (
	// ReexecEnvvar is the name of an ennvar which is set to the command
	// used to originally invoke the docker CLI when executing a
	// plugin. Assuming $PATH and $CWD remain unchanged this should allow
	// the plugin to re-execute the original CLI.
	ReexecEnvvar = "DOCKER_CLI_PLUGIN_ORIGINAL_CLI_COMMAND"

	// ResourceAttributesEnvvar is the name of the envvar that includes additional
	// resource attributes for OTEL.
	ResourceAttributesEnvvar = "OTEL_RESOURCE_ATTRIBUTES"
)

const (
	// NamePrefix is the prefix required on all plugin binary names
	NamePrefix = "docker-"

	// MetadataSubcommandName is the name of the plugin subcommand
	// which must be supported by every plugin and returns the
	// plugin metadata.
	MetadataSubcommandName = "docker-cli-plugin-metadata"

	// HookSubcommandName is the name of the plugin subcommand
	// which must be implemented by plugins declaring support
	// for hooks in their metadata.
	HookSubcommandName = "docker-cli-plugin-hooks"
)

Functions

func AddPluginCommandStubs

func AddPluginCommandStubs(dockerCli command.Cli, rootCmd *cobra.Command) (err error)

AddPluginCommandStubs adds a stub cobra.Commands for each valid and invalid plugin. The command stubs will have several annotations added, see `CommandAnnotationPlugin*`.

func IsNotFound

func IsNotFound(err error) bool

IsNotFound is true if the given error is due to a plugin not being found.

func IsPluginCommand

func IsPluginCommand(cmd *cobra.Command) bool

IsPluginCommand checks if the given cmd is a plugin-stub.

func NewPluginError

func NewPluginError(msg string, args ...any) error

NewPluginError creates a new pluginError, analogous to errors.Errorf.

func PluginRunCommand

func PluginRunCommand(dockerCli command.Cli, name string, rootcmd *cobra.Command) (*exec.Cmd, error)

PluginRunCommand returns an "os/exec".Cmd which when .Run() will execute the named plugin. The rootcmd argument is referenced to determine the set of builtin commands in order to detect conficts. The error returned satisfies the IsNotFound() predicate if no plugin was found or if the first candidate plugin was invalid somehow.

func RunCLICommandHooks

func RunCLICommandHooks(dockerCli command.Cli, rootCmd, subCommand *cobra.Command, cmdErrorMessage string)

RunCLICommandHooks is the entrypoint into the hooks execution flow after a main CLI command was executed. It calls the hook subcommand for all present CLI plugins that declare support for hooks in their metadata and parses/prints their responses.

func RunPluginHooks

func RunPluginHooks(dockerCli command.Cli, rootCmd, subCommand *cobra.Command, args []string)

RunPluginHooks is the entrypoint for the hooks execution flow after a plugin command was just executed by the CLI.

Types

type Candidate

type Candidate interface {
	Path() string
	Metadata() ([]byte, error)
}

Candidate represents a possible plugin candidate, for mocking purposes

type HookPluginData

type HookPluginData struct {
	// RootCmd is a string representing the matching hook configuration
	// which is currently being invoked. If a hook for `docker context` is
	// configured and the user executes `docker context ls`, the plugin will
	// be invoked with `context`.
	RootCmd      string
	Flags        map[string]string
	CommandError string
}

HookPluginData is the type representing the information that plugins declaring support for hooks get passed when being invoked following a CLI command execution.

type Metadata

type Metadata struct {
	// SchemaVersion describes the version of this struct. Mandatory, must be "0.1.0"
	SchemaVersion string `json:",omitempty"`
	// Vendor is the name of the plugin vendor. Mandatory
	Vendor string `json:",omitempty"`
	// Version is the optional version of this plugin.
	Version string `json:",omitempty"`
	// ShortDescription should be suitable for a single line help message.
	ShortDescription string `json:",omitempty"`
	// URL is a pointer to the plugin's homepage.
	URL string `json:",omitempty"`
}

Metadata provided by the plugin.

type Plugin

type Plugin struct {
	Metadata

	Name string `json:",omitempty"`
	Path string `json:",omitempty"`

	// Err is non-nil if the plugin failed one of the candidate tests.
	Err error `json:",omitempty"`

	// ShadowedPaths contains the paths of any other plugins which this plugin takes precedence over.
	ShadowedPaths []string `json:",omitempty"`
}

Plugin represents a potential plugin with all it's metadata.

func GetPlugin

func GetPlugin(name string, dockerCli command.Cli, rootcmd *cobra.Command) (*Plugin, error)

GetPlugin returns a plugin on the system by its name

func ListPlugins

func ListPlugins(dockerCli command.Cli, rootcmd *cobra.Command) ([]Plugin, error)

ListPlugins produces a list of the plugins available on the system

func (*Plugin) RunHook

func (p *Plugin) RunHook(hookData HookPluginData) ([]byte, error)

RunHook executes the plugin's hooks command and returns its unprocessed output.