Set buildx as default builder

Signed-off-by: CrazyMax <crazy-max@users.noreply.github.com>

cli-plugins/manager/manager.go

@@ -104,6 +104,36 @@ func listPluginCandidates(dirs []string) (map[string][]string, error) {
 	return result, nil
 }
 
+// GetPlugin returns a plugin on the system by its name
+func GetPlugin(name string, dockerCli command.Cli, rootcmd *cobra.Command) (*Plugin, error) {
+	pluginDirs, err := getPluginDirs(dockerCli)
+	if err != nil {
+		return nil, err
+	}
+
+	candidates, err := listPluginCandidates(pluginDirs)
+	if err != nil {
+		return nil, err
+	}
+
+	if paths, ok := candidates[name]; ok {
+		if len(paths) == 0 {
+			return nil, errPluginNotFound(name)
+		}
+		c := &candidate{paths[0]}
+		p, err := newPlugin(c, rootcmd)
+		if err != nil {
+			return nil, err
+		}
+		if !IsNotFound(p.Err) {
+			p.ShadowedPaths = paths[1:]
+		}
+		return &p, nil
+	}
+
+	return nil, errPluginNotFound(name)
+}
+
 // ListPlugins produces a list of the plugins available on the system
 func ListPlugins(dockerCli command.Cli, rootcmd *cobra.Command) ([]Plugin, error) {
 	pluginDirs, err := getPluginDirs(dockerCli)

cli-plugins/manager/manager_test.go

@@ -82,6 +82,29 @@ func TestListPluginCandidates(t *testing.T) {
 	assert.DeepEqual(t, candidates, exp)
 }
 
+func TestGetPlugin(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()}})
+
+	plugin, err := GetPlugin("bbb", cli, &cobra.Command{})
+	assert.NilError(t, err)
+	assert.Equal(t, plugin.Name, "bbb")
+
+	_, err = GetPlugin("ccc", cli, &cobra.Command{})
+	assert.Error(t, err, "Error: No such CLI plugin: ccc")
+	assert.Assert(t, IsNotFound(err))
+}
+
 func TestListPluginsIsSorted(t *testing.T) {
 	dir := fs.NewDir(t, t.Name(),
 		fs.WithFile("docker-bbb", `