buildctl: fix dump-metadata

Signed-off-by: Akihiro Suda <suda.akihiro@lab.ntt.co.jp>

cmd/buildctl/debug/dumpmetadata.go

@@ -3,6 +3,8 @@ package debug
 import (
 	"errors"
 	"fmt"
+	"io/ioutil"
+	"os"
 	"path/filepath"
 	"time"
 
@@ -22,13 +24,43 @@ var DumpMetadataCommand = cli.Command{
 		},
 	},
 	Action: func(clicontext *cli.Context) error {
-		dbFile := filepath.Join(clicontext.String("root"), "metadata.db")
-		return dumpBolt(dbFile, func(k, v []byte) string {
-			return fmt.Sprintf("%q: %s", string(k), string(v))
-		})
+		dbFiles, err := findMetadataDBFiles(clicontext.String("root"))
+		if err != nil {
+			return err
+		}
+		for _, dbFile := range dbFiles {
+			fmt.Printf("===== %s =====\n", dbFile)
+			if err := dumpBolt(dbFile, func(k, v []byte) string {
+				return fmt.Sprintf("%q: %s", string(k), string(v))
+			}); err != nil {
+				return err
+			}
+		}
+		return nil
 	},
 }
 
+func findMetadataDBFiles(root string) ([]string, error) {
+	dirs, err := ioutil.ReadDir(root)
+	if err != nil {
+		return nil, err
+	}
+	var files []string
+	for _, dir := range dirs {
+		if !dir.IsDir() {
+			continue
+		}
+		p := filepath.Join(root, dir.Name(), "metadata.db")
+		_, err := os.Stat(p)
+		if err == nil {
+			files = append(files, p)
+		} else if !os.IsNotExist(err) {
+			return nil, err
+		}
+	}
+	return files, nil
+}
+
 func dumpBolt(dbFile string, stringifier func(k, v []byte) string) error {
 	if dbFile == "" {
 		return errors.New("dbfile not specified")

worker/runc/runc.go

@@ -30,7 +30,7 @@ func NewWorkerOpt(root string) (worker.WorkerOpt, error) {
 	if err := os.MkdirAll(root, 0700); err != nil {
 		return opt, err
 	}
-	md, err := metadata.NewStore(filepath.Join(root, name+"-metadata.db"))
+	md, err := metadata.NewStore(filepath.Join(root, "metadata.db"))
 	if err != nil {
 		return opt, err
 	}