docker info: list CLI plugins alphabetically

Before this change, plugins were listed in a random order:

    Client:
     Debug Mode: false
     Plugins:
      doodle: Docker Doodles  all around! 🐳 🎃 (thaJeztah, v0.0.1)
      shell: Open a browser shell on the Docker Host. (thaJeztah, v0.0.1)
      app: Docker Application (Docker Inc., v0.8.0)
      buildx: Build with BuildKit (Docker Inc., v0.3.1-tp-docker)

With this change, plugins are listed alphabetically:

    Client:
     Debug Mode: false
     Plugins:
      app: Docker Application (Docker Inc., v0.8.0)
      buildx: Build with BuildKit (Docker Inc., v0.3.1-tp-docker)
      doodle: Docker Doodles  all around! 🐳 🎃 (thaJeztah, v0.0.1)
      shell: Open a browser shell on the Docker Host. (thaJeztah, v0.0.1)

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

cli-plugins/manager/manager.go

@@ -6,11 +6,13 @@ import (
 	"os"
 	"os/exec"
 	"path/filepath"
+	"sort"
 	"strings"
 
 	"github.com/docker/cli/cli/command"
 	"github.com/docker/cli/cli/config"
 	"github.com/spf13/cobra"
+	"vbom.ml/util/sortorder"
 )
 
 // ReexecEnvvar is the name of an ennvar which is set to the command
@@ -141,6 +143,10 @@ func ListPlugins(dockerCli command.Cli, rootcmd *cobra.Command) ([]Plugin, error
 		}
 	}
 
+	sort.Slice(plugins, func(i, j int) bool {
+		return sortorder.NaturalLess(plugins[i].Name, plugins[j].Name)
+	})
+
 	return plugins, nil
 }
 

cli-plugins/manager/manager_test.go

@@ -7,6 +7,7 @@ import (
 	"github.com/docker/cli/cli/config"
 	"github.com/docker/cli/cli/config/configfile"
 	"github.com/docker/cli/internal/test"
+	"github.com/spf13/cobra"
 	"gotest.tools/assert"
 	"gotest.tools/fs"
 )
@@ -81,6 +82,34 @@ func TestListPluginCandidates(t *testing.T) {
 	assert.DeepEqual(t, candidates, exp)
 }
 
+func TestListPluginsIsSorted(t *testing.T) {
+	dir := fs.NewDir(t, t.Name(),
+		fs.WithFile("docker-bbb", `
+#!/bin/sh
+echo '{"SchemaVersion":"0.1.0"}'`, fs.WithMode(0777)),
+		fs.WithFile("docker-aaa", `
+#!/bin/sh
+echo '{"SchemaVersion":"0.1.0"}'`, fs.WithMode(0777)),
+	)
+	defer dir.Remove()
+
+	cli := test.NewFakeCli(nil)
+	cli.SetConfigFile(&configfile.ConfigFile{CLIPluginsExtraDirs: []string{dir.Path()}})
+
+	plugins, err := ListPlugins(cli, &cobra.Command{})
+	assert.NilError(t, err)
+
+	// We're only interested in the plugins we created for testing this, and only
+	// if they appear in the expected order
+	var names []string
+	for _, p := range plugins {
+		if p.Name == "aaa" || p.Name == "bbb" {
+			names = append(names, p.Name)
+		}
+	}
+	assert.DeepEqual(t, names, []string{"aaa", "bbb"})
+}
+
 func TestErrPluginNotFound(t *testing.T) {
 	var err error = errPluginNotFound("test")
 	err.(errPluginNotFound).NotFound()