internal/pkg: consolidate cache attributes

This makes the interface stable.

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

cmd/mbf/cache.go

@@ -21,7 +21,7 @@ type cache struct {
 	// Should generally not be used directly.
 	c *pkg.Cache
 
-	cures, jobs int
+	attr pkg.CacheAttr
 	// Primarily to work around missing landlock LSM.
 	hostAbstract bool
 	// Set SCHED_IDLE.
@@ -49,18 +49,17 @@ func (cache *cache) open() (err error) {
 		return
 	}
 
-	var flags int
 	if cache.idle {
-		flags |= pkg.CSchedIdle
+		cache.attr.Flags |= pkg.CSchedIdle
 	}
 	if cache.hostAbstract {
-		flags |= pkg.CHostAbstract
+		cache.attr.Flags |= pkg.CHostAbstract
 	}
 	if !cache.verboseInit {
-		flags |= pkg.CSuppressInit
+		cache.attr.Flags |= pkg.CSuppressInit
 	}
 	if !cache.deep {
-		flags |= pkg.CExternShallow
+		cache.attr.Flags |= pkg.CExternShallow
 	}
 
 	done := make(chan struct{})
@@ -82,10 +81,8 @@ func (cache *cache) open() (err error) {
 	cache.c, err = pkg.Open(
 		cache.ctx,
 		cache.msg,
-		flags,
-		cache.cures,
-		cache.jobs,
 		base,
+		&cache.attr,
 	)
 	if err != nil {
 		return