comparison fails if PAXRecord is nil

Signed-off-by: Martin Zihlmann <[email protected]>

Author: mzihlmann

pkg/diff/diff.go

@@ -888,6 +888,14 @@ func (d *differ) diffTarEntry(ctx context.Context, node *EventTreeNode, in [2]Ev
 		ent0.Header.Mode &= 0x0FFF
 		ent1.Header.Mode &= 0x0FFF
 	}
+	pax0 := ent0.Header.PAXRecords
+	if pax0 == nil {
+		pax0 = map[string]string{}
+	}
+	pax1 := ent1.Header.PAXRecords
+	if pax1 == nil {
+		pax1 = map[string]string{}
+	}
 	var errs []error
 	if diff := cmp.Diff(ent0, ent1, cmpOpts...); diff != "" {
 		ev := Event{
@@ -899,7 +907,7 @@ func (d *differ) diffTarEntry(ctx context.Context, node *EventTreeNode, in [2]Ev
 		if err := d.raiseEvent(ctx, node, ev, "tarentry"); err != nil {
 			errs = append(errs, err)
 		}
-	} else if diff := cmp.Diff(ent0.Header.PAXRecords, ent1.Header.PAXRecords, paxOpts...); diff != "" {
+	} else if diff := cmp.Diff(pax0, pax1, paxOpts...); diff != "" {
 		ev := Event{
 			Type:   EventTypeTarEntryMismatch,
 			Inputs: in,