bootctl: Provide an extra poll between select and booting

Selecting an OS may cause the UI to change, so give it a chance to show
those changes before booting.

Signed-off-by: Simon Glass <simon.glass@canonical.com>

boot/bootctl/logic.c

@@ -242,8 +242,22 @@ static int logic_poll(struct udevice *dev)
 		struct osinfo *os;
 
 		os = alist_getw(&priv->osinfo, seq, struct osinfo);
+		if (!os)
+			return log_msg_ret("gos", -ENOENT);
+		priv->ready_to_boot = false;
+		priv->selected_seq = seq;
+	}
+
+	if (priv->ready_to_boot) {
+		struct osinfo *os;
+
+		seq = priv->selected_seq;
+		os = alist_getw(&priv->osinfo, seq, struct osinfo);
+		if (!os)
+			return log_msg_ret("gbo", -ENOENT);
 		log_info("Selected %d: %s\n", seq, os->bflow.os_name);
 
+		priv->ready_to_boot = false;
 		/*
 		 * try to read the images first; some methods don't support
 		 * this

include/bootctl/logic.h

@@ -37,10 +37,10 @@ struct udevice;
  * @default_os: name of the default OS to boot
  * @osinfo: List of OSes to show
  * @refresh: true if we need to refresh the UI because something has changed
+ * @selected_seq: sequence number of OS waiting for passphrase, or -1 if none
+ * @ready_to_boot: true if success message shown, ready to boot on next poll
  *
  * @iter: oslist iterator, used to find new OSes
- * @selected: index of selected OS in osinfo alist, or -1 if none has been
- *	selected yet
  * @meas: TPM-measurement device
  * @oslist: provides OSes to boot; we iterate through each osinfo driver to find
  * all OSes
@@ -68,6 +68,8 @@ struct logic_priv {
 	const char *default_os;
 	struct alist osinfo;
 	bool refresh;
+	int selected_seq;
+	bool ready_to_boot;
 
 	struct oslist_iter iter;
 	struct udevice *meas;