Integrate CLI plugins into `docker info`

Fairly straight forward. It became necessary to wrap `Plugin.Err` with a type
which implements `encoding.MarshalText` in order to have that field rendered
properly in the `docker info -f '{{json}}'` output.

Since I changed the type somewhat I also added a unit test for `formatInfo`.

Signed-off-by: Ian Campbell <ijc@docker.com>
This commit is contained in:
Ian Campbell 2018-12-19 14:49:20 +00:00
parent 0ab8ec0e4c
commit 1c576e9043
15 changed files with 210 additions and 25 deletions

View File

@ -2,11 +2,13 @@ package manager
import (
"fmt"
"reflect"
"strings"
"testing"
"github.com/spf13/cobra"
"gotest.tools/assert"
"gotest.tools/assert/cmp"
)
type fakeCandidate struct {
@ -73,6 +75,7 @@ func TestValidateCandidate(t *testing.T) {
assert.ErrorContains(t, err, tc.err)
} else if tc.invalid != "" {
assert.NilError(t, err)
assert.Assert(t, cmp.ErrorType(p.Err, reflect.TypeOf(&pluginError{})))
assert.ErrorContains(t, p.Err, tc.invalid)
} else {
assert.NilError(t, err)

View File

@ -0,0 +1,43 @@
package manager
import (
"github.com/pkg/errors"
)
// pluginError is set as Plugin.Err by NewPlugin if the plugin
// candidate fails one of the candidate tests. This exists primarily
// to implement encoding.TextMarshaller such that rendering a plugin as JSON
// (e.g. for `docker info -f '{{json .CLIPlugins}}'`) renders the Err
// field as a useful string and not just `{}`. See
// https://github.com/golang/go/issues/10748 for some discussion
// around why the builtin error type doesn't implement this.
type pluginError struct {
cause error
}
// Error satisfies the core error interface for pluginError.
func (e *pluginError) Error() string {
return e.cause.Error()
}
// Cause satisfies the errors.causer interface for pluginError.
func (e *pluginError) Cause() error {
return e.cause
}
// MarshalText marshalls the pluginError into a textual form.
func (e *pluginError) MarshalText() (text []byte, err error) {
return []byte(e.cause.Error()), nil
}
// wrapAsPluginError wraps an error in a pluginError with an
// additional message, analogous to errors.Wrapf.
func wrapAsPluginError(err error, msg string) error {
return &pluginError{cause: errors.Wrap(err, msg)}
}
// NewPluginError creates a new pluginError, analogous to
// errors.Errorf.
func NewPluginError(msg string, args ...interface{}) error {
return &pluginError{cause: errors.Errorf(msg, args...)}
}

View File

@ -0,0 +1,24 @@
package manager
import (
"fmt"
"testing"
"github.com/pkg/errors"
"gopkg.in/yaml.v2"
"gotest.tools/assert"
)
func TestPluginError(t *testing.T) {
err := NewPluginError("new error")
assert.Error(t, err, "new error")
inner := fmt.Errorf("testing")
err = wrapAsPluginError(inner, "wrapping")
assert.Error(t, err, "wrapping: testing")
assert.Equal(t, inner, errors.Cause(err))
actual, err := yaml.Marshal(err)
assert.NilError(t, err)
assert.Equal(t, "'wrapping: testing'\n", string(actual))
}

View File

@ -13,13 +13,13 @@ const (
// Metadata provided by the plugin
type Metadata struct {
// SchemaVersion describes the version of this struct. Mandatory, must be "0.1.0"
SchemaVersion string
SchemaVersion string `json:",omitempty"`
// Vendor is the name of the plugin vendor. Mandatory
Vendor string
Vendor string `json:",omitempty"`
// Version is the optional version of this plugin.
Version string
Version string `json:",omitempty"`
// ShortDescription should be suitable for a single line help message.
ShortDescription string
ShortDescription string `json:",omitempty"`
// URL is a pointer to the plugin's homepage.
URL string
URL string `json:",omitempty"`
}

View File

@ -19,8 +19,8 @@ var (
type Plugin struct {
Metadata
Name string
Path string
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"`
@ -31,8 +31,9 @@ type Plugin struct {
// newPlugin determines if the given candidate is valid and returns a
// Plugin. If the candidate fails one of the tests then `Plugin.Err`
// is set, but the `Plugin` is still returned with no error. An error
// is only returned due to a non-recoverable error.
// is set, and is always a `pluginError`, but the `Plugin` is still
// returned with no error. An error is only returned due to a
// non-recoverable error.
func newPlugin(c Candidate, rootcmd *cobra.Command) (Plugin, error) {
path := c.Path()
if path == "" {
@ -63,7 +64,7 @@ func newPlugin(c Candidate, rootcmd *cobra.Command) (Plugin, error) {
// Now apply the candidate tests, so these update p.Err.
if !pluginNameRe.MatchString(p.Name) {
p.Err = errors.Errorf("plugin candidate %q did not match %q", p.Name, pluginNameRe.String())
p.Err = NewPluginError("plugin candidate %q did not match %q", p.Name, pluginNameRe.String())
return p, nil
}
@ -76,11 +77,11 @@ func newPlugin(c Candidate, rootcmd *cobra.Command) (Plugin, error) {
continue
}
if cmd.Name() == p.Name {
p.Err = errors.Errorf("plugin %q duplicates builtin command", p.Name)
p.Err = NewPluginError("plugin %q duplicates builtin command", p.Name)
return p, nil
}
if cmd.HasAlias(p.Name) {
p.Err = errors.Errorf("plugin %q duplicates an alias of builtin command %q", p.Name, cmd.Name())
p.Err = NewPluginError("plugin %q duplicates an alias of builtin command %q", p.Name, cmd.Name())
return p, nil
}
}
@ -89,21 +90,21 @@ func newPlugin(c Candidate, rootcmd *cobra.Command) (Plugin, error) {
// We are supposed to check for relevant execute permissions here. Instead we rely on an attempt to execute.
meta, err := c.Metadata()
if err != nil {
p.Err = errors.Wrap(err, "failed to fetch metadata")
p.Err = wrapAsPluginError(err, "failed to fetch metadata")
return p, nil
}
if err := json.Unmarshal(meta, &p.Metadata); err != nil {
p.Err = errors.Wrap(err, "invalid metadata")
p.Err = wrapAsPluginError(err, "invalid metadata")
return p, nil
}
if p.Metadata.SchemaVersion != "0.1.0" {
p.Err = errors.Errorf("plugin SchemaVersion %q is not valid, must be 0.1.0", p.Metadata.SchemaVersion)
p.Err = NewPluginError("plugin SchemaVersion %q is not valid, must be 0.1.0", p.Metadata.SchemaVersion)
return p, nil
}
if p.Metadata.Vendor == "" {
p.Err = errors.Errorf("plugin metadata does not define a vendor")
p.Err = NewPluginError("plugin metadata does not define a vendor")
return p, nil
}
return p, nil

View File

@ -8,6 +8,7 @@ import (
"strings"
"github.com/docker/cli/cli"
pluginmanager "github.com/docker/cli/cli-plugins/manager"
"github.com/docker/cli/cli/command"
"github.com/docker/cli/cli/debug"
"github.com/docker/cli/templates"
@ -23,6 +24,7 @@ type infoOptions struct {
type clientInfo struct {
Debug bool
Plugins []pluginmanager.Plugin
Warnings []string
}
@ -47,7 +49,7 @@ func NewInfoCommand(dockerCli command.Cli) *cobra.Command {
Short: "Display system-wide information",
Args: cli.NoArgs,
RunE: func(cmd *cobra.Command, args []string) error {
return runInfo(dockerCli, &opts)
return runInfo(cmd, dockerCli, &opts)
},
}
@ -58,7 +60,7 @@ func NewInfoCommand(dockerCli command.Cli) *cobra.Command {
return cmd
}
func runInfo(dockerCli command.Cli, opts *infoOptions) error {
func runInfo(cmd *cobra.Command, dockerCli command.Cli, opts *infoOptions) error {
var info info
ctx := context.Background()
@ -71,6 +73,11 @@ func runInfo(dockerCli command.Cli, opts *infoOptions) error {
info.ClientInfo = &clientInfo{
Debug: debug.IsEnabled(),
}
if plugins, err := pluginmanager.ListPlugins(dockerCli, cmd.Root()); err == nil {
info.ClientInfo.Plugins = plugins
} else {
info.ClientErrors = append(info.ClientErrors, err.Error())
}
if opts.format == "" {
return prettyPrintInfo(dockerCli, info)
@ -109,6 +116,17 @@ func prettyPrintInfo(dockerCli command.Cli, info info) error {
func prettyPrintClientInfo(dockerCli command.Cli, info clientInfo) error {
fmt.Fprintln(dockerCli.Out(), " Debug Mode:", info.Debug)
if len(info.Plugins) > 0 {
fmt.Fprintln(dockerCli.Out(), " Plugins:")
for _, p := range info.Plugins {
if p.Err == nil {
fmt.Fprintf(dockerCli.Out(), " %s: (%s, %s) %s\n", p.Name, p.Version, p.Vendor, p.ShortDescription)
} else {
info.Warnings = append(info.Warnings, fmt.Sprintf("WARNING: Plugin %q is not valid: %s", p.Path, p.Err))
}
}
}
if len(info.Warnings) > 0 {
fmt.Fprintln(dockerCli.Err(), strings.Join(info.Warnings, "\n"))
}
@ -447,6 +465,11 @@ func getBackingFs(info types.Info) string {
}
func formatInfo(dockerCli command.Cli, info info, format string) error {
// Ensure slice/array fields render as `[]` not `null`
if info.ClientInfo != nil && info.ClientInfo.Plugins == nil {
info.ClientInfo.Plugins = make([]pluginmanager.Plugin, 0)
}
tmpl, err := templates.Parse(format)
if err != nil {
return cli.StatusError{StatusCode: 64,

View File

@ -6,6 +6,7 @@ import (
"testing"
"time"
pluginmanager "github.com/docker/cli/cli-plugins/manager"
"github.com/docker/cli/internal/test"
"github.com/docker/docker/api/types"
"github.com/docker/docker/api/types/registry"
@ -192,6 +193,24 @@ PQQDAgNIADBFAiEAo9fTQNM5DP9bHVcTJYfl2Cay1bFu1E+lnpmN+EYJfeACIGKH
},
}
var samplePluginsInfo = []pluginmanager.Plugin{
{
Name: "goodplugin",
Path: "/path/to/docker-goodplugin",
Metadata: pluginmanager.Metadata{
SchemaVersion: "0.1.0",
ShortDescription: "unit test is good",
Vendor: "ACME Corp",
Version: "0.1.0",
},
},
{
Name: "badplugin",
Path: "/path/to/docker-badplugin",
Err: pluginmanager.NewPluginError("something wrong"),
},
}
func TestPrettyPrintInfo(t *testing.T) {
infoWithSwarm := sampleInfoNoSwarm
infoWithSwarm.Swarm = sampleSwarmInfo
@ -230,6 +249,7 @@ func TestPrettyPrintInfo(t *testing.T) {
for _, tc := range []struct {
doc string
dockerInfo info
prettyGolden string
warningsGolden string
jsonGolden string
@ -245,6 +265,19 @@ func TestPrettyPrintInfo(t *testing.T) {
jsonGolden: "docker-info-no-swarm",
},
{
doc: "info with plugins",
dockerInfo: info{
Info: &sampleInfoNoSwarm,
ClientInfo: &clientInfo{
Plugins: samplePluginsInfo,
},
},
prettyGolden: "docker-info-plugins",
jsonGolden: "docker-info-plugins",
warningsGolden: "docker-info-plugins-warnings",
},
{
doc: "info with swarm",
dockerInfo: info{
Info: &infoWithSwarm,

View File

@ -1 +1 @@
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@ -1 +1 @@
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