feat: rewrite the storage plugin in golang

Refs #6814

plugins/storage/src/commands/commands.go

@@ -0,0 +1,60 @@
+package main
+
+import (
+	"flag"
+	"fmt"
+	"os"
+	"strconv"
+	"strings"
+
+	"github.com/dokku/dokku/plugins/common"
+)
+
+const (
+	helpHeader = `Usage: dokku storage[:COMMAND]
+
+Manage mounted volumes
+
+Additional commands:`
+
+	helpContent = `
+    storage:ensure-directory [--chown option] <directory>, Creates a persistent storage directory in the recommended storage path
+    storage:list <app> [--format text|json], List bind mounts for app's container(s) (host:container)
+    storage:mount <app> <host-dir:container-dir>, Create a new bind mount
+    storage:report [<app>] [<flag>], Displays a storage report for one or more apps
+    storage:unmount <app> <host-dir:container-dir>, Remove an existing bind mount`
+)
+
+func main() {
+	flag.Usage = usage
+	flag.Parse()
+
+	cmd := flag.Arg(0)
+	switch cmd {
+	case "storage":
+		usage()
+	case "storage:help":
+		usage()
+	case "help":
+		result, err := common.CallExecCommand(common.ExecCommandInput{
+			Command: "ps",
+			Args:    []string{"-o", "command=", strconv.Itoa(os.Getppid())},
+		})
+		if err == nil && strings.Contains(result.StdoutContents(), "--all") {
+			fmt.Println(helpContent)
+		} else {
+			fmt.Print("\n    storage, Manage mounted volumes\n")
+		}
+	default:
+		dokkuNotImplementExitCode, err := strconv.Atoi(os.Getenv("DOKKU_NOT_IMPLEMENTED_EXIT"))
+		if err != nil {
+			fmt.Println("failed to retrieve DOKKU_NOT_IMPLEMENTED_EXIT environment variable")
+			dokkuNotImplementExitCode = 10
+		}
+		os.Exit(dokkuNotImplementExitCode)
+	}
+}
+
+func usage() {
+	common.CommandUsage(helpHeader, helpContent)
+}