internal/app: relocate dynamic exported state

This allows reuse of the populateEarly method in test instrumentation.

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

internal/app/finalise.go

@@ -96,21 +96,7 @@ func (k *outcome) finalise(ctx context.Context, msg container.Msg, id *state.ID,
 		EnvPaths:  copyPaths(k.syscallDispatcher),
 		Container: config.Container,
 	}
-
-	// enforce bounds and default early
-	if s.Container.WaitDelay <= 0 {
-		kp.waitDelay = hst.WaitDelayDefault
-	} else if s.Container.WaitDelay > hst.WaitDelayMax {
-		kp.waitDelay = hst.WaitDelayMax
-	} else {
-		kp.waitDelay = s.Container.WaitDelay
-	}
-
-	if s.Container.MapRealUID {
-		s.Mapuid, s.Mapgid = k.getuid(), k.getgid()
-	} else {
-		s.Mapuid, s.Mapgid = k.overflowUid(msg), k.overflowGid(msg)
-	}
+	kp.waitDelay = s.populateEarly(k.syscallDispatcher, msg)
 
 	// TODO(ophestra): duplicate in shim (params to shim)
 	if err := s.populateLocal(k.syscallDispatcher, msg); err != nil {

internal/app/outcome.go

@@ -2,6 +2,7 @@ package app
 
 import (
 	"strconv"
+	"time"
 
 	"hakurei.app/container"
 	"hakurei.app/container/check"
@@ -68,6 +69,27 @@ func (s *outcomeState) valid() bool {
 		s.EnvPaths != nil
 }
 
+// populateEarly populates exported fields via syscallDispatcher.
+// This must only be called from the priv side.
+func (s *outcomeState) populateEarly(k syscallDispatcher, msg container.Msg) (waitDelay time.Duration) {
+	// enforce bounds and default early
+	if s.Container.WaitDelay <= 0 {
+		waitDelay = hst.WaitDelayDefault
+	} else if s.Container.WaitDelay > hst.WaitDelayMax {
+		waitDelay = hst.WaitDelayMax
+	} else {
+		waitDelay = s.Container.WaitDelay
+	}
+
+	if s.Container.MapRealUID {
+		s.Mapuid, s.Mapgid = k.getuid(), k.getgid()
+	} else {
+		s.Mapuid, s.Mapgid = k.overflowUid(msg), k.overflowGid(msg)
+	}
+
+	return
+}
+
 // populateLocal populates unexported fields from transmitted exported fields.
 // These fields are cheaper to recompute per-process.
 func (s *outcomeState) populateLocal(k syscallDispatcher, msg container.Msg) error {
@@ -161,7 +183,7 @@ func (state *outcomeStateSys) runtime() *check.Absolute {
 type outcomeStateParams struct {
 	// Overrides the embedded [container.Params] in [container.Container]. The Env field must not be used.
 	params *container.Params
-	// Collapsed into the Env slice in [container.Params] after every call to outcomeOp.toContainer completes.
+	// Collapsed into the Env slice in [container.Params] by the final outcomeOp.
 	env map[string]string
 
 	// Filesystems with the optional root sliced off if present. Populated by spParamsOp.