internal/pkg: consolidate cache attributes

This makes the interface stable.

Signed-off-by: Ophestra <cat@gensokyo.uk>

internal/rosa/mirror_test.go

@@ -31,7 +31,7 @@ func TestMirror(t *testing.T) {
 	msg.SwapVerbose(testing.Verbose())
 
 	var c *pkg.Cache
-	c, err = pkg.Open(t.Context(), msg, 0, 0, 0, base)
+	c, err = pkg.Open(t.Context(), msg, base, nil)
 	if err != nil {
 		t.Fatal(err)
 	}

internal/rosa/rosa_test.go

@@ -61,7 +61,9 @@ func getCache(t *testing.T) *pkg.Cache {
 			msg := message.New(log.New(os.Stderr, "rosa: ", 0))
 			msg.SwapVerbose(true)
 
-			if buildTestCache, err = pkg.Open(ctx, msg, pkg.CSuppressInit, 0, 0, a); err != nil {
+			if buildTestCache, err = pkg.Open(ctx, msg, a, &pkg.CacheAttr{
+				Flags: pkg.CSuppressInit,
+			}); err != nil {
 				t.Fatal(err)
 			}
 		}