lib/backup/fslocal: clean directory path to handle trailing slash

Make test assertion stricter: expect exactly one part instead of at least one

lib/backup/fslocal: clean directory path to handle trailing slash

lib/backup/fslocal/fslocal.go

@@ -33,6 +33,7 @@ type FS struct {
 //
 // The returned fs must be stopped when no long needed with MustStop call.
 func (fs *FS) Init() error {
+	fs.Dir = filepath.Clean(fs.Dir)
 	if fs.MaxBytesPerSecond > 0 {
 		fs.bl = newBandwidthLimiter(fs.MaxBytesPerSecond)
 	}

lib/backup/fslocal/fslocal_test.go

@@ -0,0 +1,29 @@
+package fslocal
+
+import (
+	"os"
+	"path/filepath"
+	"testing"
+)
+
+func TestFSInitCleanDir(t *testing.T) {
+	dir := t.TempDir()
+	if err := os.WriteFile(filepath.Join(dir, "testfile"), []byte("x"), 0600); err != nil {
+		t.Fatal(err)
+	}
+
+	// trailing slash must not cause ListParts to panic
+	fs := &FS{Dir: dir + string(filepath.Separator)}
+	if err := fs.Init(); err != nil {
+		t.Fatalf("Init error: %s", err)
+	}
+	defer fs.MustStop()
+
+	parts, err := fs.ListParts()
+	if err != nil {
+		t.Fatalf("ListParts error: %s", err)
+	}
+	if len(parts) != 1 {
+		t.Fatalf("expected 1 part, got %d", len(parts))
+	}
+}