internal/rosa: reinitialise frame alongside cache

The cached frame can contain information made outdated by the DropCaches call.

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

internal/rosa/state.go

@@ -189,8 +189,6 @@ type S struct {
 
 	// Target architecture.
 	arch string
-	// For matching arch-specific values.
-	identArch unique.Handle[azalea.Ident]
 	// For initialising arch.
 	archOnce sync.Once
 
@@ -229,7 +227,6 @@ func (s *S) wantsArch() {
 	s.archOnce.Do(func() {
 		if s.arch == "" {
 			s.arch = runtime.GOARCH
-			s.identArch = unique.Make(azalea.Ident(s.arch))
 		}
 	})
 }
@@ -248,11 +245,11 @@ func (s *S) DropCaches(targetArch string, flags int) {
 	}
 
 	s.arch = targetArch
-	s.identArch = unique.Make(azalea.Ident(s.arch))
 	s.opts = flags
 	for i := range s.c {
 		s.c[i].Clear()
 	}
+	s.frameOnce = sync.Once{}
 }
 
 // get returns the named [Artifact].
@@ -426,7 +423,8 @@ func (s *S) getFrame() azalea.Frame {
 			return unique.Make(azalea.Ident(name))
 		}
 
-		var identDefault = k("default")
+		identDefault := k("default")
+		identArch := unique.Make(azalea.Ident(s.arch))
 
 		enumCompress := map[unique.Handle[azalea.Ident]]any{
 			k("uncompressed"): uint32(pkg.TarUncompressed),
@@ -627,7 +625,7 @@ func (s *S) getFrame() azalea.Frame {
 						fallback = arg.V
 						continue
 
-					case s.identArch:
+					case identArch:
 						return arg.V, true, nil
 					}
 				}