internal/uevent: kobject_action lookup

This is encoded as part of kobject uevent message headers.

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

internal/uevent/action_test.go

@@ -0,0 +1,32 @@
+package uevent_test
+
+import (
+	"syscall"
+	"testing"
+
+	"hakurei.app/internal/uevent"
+)
+
+func TestKobjectAction(t *testing.T) {
+	t.Parallel()
+
+	adeT(t, "add", uevent.KOBJ_ADD, "add", nil, nil)
+	adeT(t, "remove", uevent.KOBJ_REMOVE, "remove", nil, nil)
+	adeT(t, "change", uevent.KOBJ_CHANGE, "change", nil, nil)
+	adeT(t, "move", uevent.KOBJ_MOVE, "move", nil, nil)
+	adeT(t, "online", uevent.KOBJ_ONLINE, "online", nil, nil)
+	adeT(t, "offline", uevent.KOBJ_OFFLINE, "offline", nil, nil)
+	adeT(t, "bind", uevent.KOBJ_BIND, "bind", nil, nil)
+	adeT(t, "unbind", uevent.KOBJ_UNBIND, "unbind", nil, nil)
+
+	adeT(t, "unsupported", uevent.KobjectAction(0xbad), "explode",
+		uevent.UnsupportedActionError("explode"), syscall.EINVAL)
+	t.Run("oob string", func(t *testing.T) {
+		t.Parallel()
+
+		const want = "unsupported kobject_action 2989"
+		if got := uevent.KobjectAction(0xbad).String(); got != want {
+			t.Errorf("String: %q, want %q", got, want)
+		}
+	})
+}