Add code to dbinspect for deleting keys from buckets

cmd/dbinspect/main.go

@@ -5,6 +5,7 @@ import (
 	"flag"
 	"fmt"
 	"log"
+	"os"
 	"strings"
 
 	bolt "go.etcd.io/bbolt"
@@ -69,14 +70,18 @@ type bucketDeleter interface {
 	Bucket([]byte) *bolt.Bucket
 }
 
-func commandDeleteBucket(db *bolt.DB, args []string) error {
+type deleter interface {
+	Delete([]byte) error
+}
+
+func commandDelete(db *bolt.DB, args []string) error {
 	if len(args) != 1 {
 		return errors.New("expected exactly one argument")
 	}
 
 	path := strings.Split(strings.Trim(args[0], "/"), "/")
 
-	fmt.Println("removing", path)
+	fmt.Fprintln(os.Stderr, "removing", path)
 
 	return db.Update(func(tx *bolt.Tx) error {
 		var del bucketDeleter
@@ -92,7 +97,21 @@ func commandDeleteBucket(db *bolt.DB, args []string) error {
 			path = path[1:]
 		}
 
-		return del.DeleteBucket([]byte(path[0]))
+		err := del.DeleteBucket([]byte(path[0]))
+		if err == nil {
+			return nil
+		}
+
+		if errors.Is(err, bolt.ErrIncompatibleValue) {
+			d, ok := del.(deleter)
+			if !ok {
+				return err
+			}
+
+			return d.Delete([]byte(path[0]))
+		}
+
+		return err
 	})
 }
 
@@ -112,18 +131,22 @@ func main() {
 		command = flag.Args()[0]
 	}
 
-	args := flag.Args()[1:]
+	var args []string
+	if len(flag.Args()) > 0 {
+		args = flag.Args()[1:]
+	}
 
 	switch command {
 	case "ls":
 		err = commandList(db, args)
 	case "del":
-		err = commandDeleteBucket(db, args)
+		err = commandDelete(db, args)
 	default:
 		err = fmt.Errorf("unexpected command %q", command)
 	}
 
 	if err != nil {
-		log.Fatalln("can't view db:", err)
+		fmt.Fprintln(os.Stderr, err)
+		os.Exit(1)
 	}
 }