internal/uevent: nontrivial errors

These errors are best represented as JSON.

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

internal/uevent/uevent.go

@@ -9,8 +9,12 @@ import (
 	"hakurei.app/internal/netlink"
 )
 
-// Recoverable is satisfied by errors that are safe to recover from.
-type Recoverable interface{ recoverable() }
+type (
+	// Recoverable is satisfied by errors that are safe to recover from.
+	Recoverable interface{ recoverable() }
+	// Nontrivial is satisfied by errors preferring a JSON encoding.
+	Nontrivial interface{ nontrivial() }
+)
 
 // Conn represents a NETLINK_KOBJECT_UEVENT socket.
 type Conn struct{ conn *netlink.Conn }