feat: first pass at registry plugin

plugins/registry/subcommands.go

@@ -0,0 +1,65 @@
+package registry
+
+import (
+	"errors"
+	"io"
+	"io/ioutil"
+	"os"
+	"strings"
+
+	"github.com/dokku/dokku/plugins/common"
+)
+
+func CommandLogin(server string, username string, password string, passwordStdin bool) error {
+	if passwordStdin {
+		stdin, err := ioutil.ReadAll(os.Stdin)
+		if err != nil {
+			return err
+		}
+
+		password = strings.TrimSpace(string(stdin))
+	}
+
+	command := []string{
+		common.DockerBin(),
+		"login",
+		"--username",
+		username,
+		"--password-stdin",
+		server,
+	}
+
+	reader, writer := io.Pipe()
+	writer.Write([]byte(password))
+	loginCmd := common.NewShellCmd(strings.Join(command, " "))
+	loginCmd.Command.Stdin = reader
+	if !loginCmd.Execute() {
+		return errors.New("Failed to log into registry")
+	}
+
+	return nil
+}
+
+// CommandReport displays a registry report for one or more apps
+func CommandReport(appName string, format string, infoFlag string) error {
+	if len(appName) == 0 {
+		apps, err := common.DokkuApps()
+		if err != nil {
+			return err
+		}
+		for _, appName := range apps {
+			if err := ReportSingleApp(appName, format, infoFlag); err != nil {
+				return err
+			}
+		}
+		return nil
+	}
+
+	return ReportSingleApp(appName, format, infoFlag)
+}
+
+// CommandSet set or clear a registry property for an app
+func CommandSet(appName string, property string, value string) error {
+	common.CommandPropertySet("registry", appName, property, value, DefaultProperties, GlobalProperties)
+	return nil
+}