[PATCH master] startup: fix infinite loop falling into menu without /env/menu/mainmenu

[Ahmad Fatoum]

If MENUFILE (/env/menu/mainmenu) doesn't exist, an infinite loop will
keep executing this non-existent file.

If this happens, let's exit the infinite loop and hang barebox instead.

Previously we dropped to a shell in this situation, but this was changed
as menu-only boots should not be circumventable and drop to a shell due
to errors.

Fixes: 96852a962d0c ("startup: don't fallback to shell from menu")
Signed-off-by: Ahmad Fatoum <a.fatoum at pengutronix.de>
---
 common/startup.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/common/startup.c b/common/startup.c
index 723d4f1ecc3b..3debb6668be7 100644
--- a/common/startup.c
+++ b/common/startup.c
@@ -344,10 +344,15 @@ static int run_init(void)
 		run_shell();
 	}
 
-	while (1)
+	do {
+		/*
+		 * Let's run the command once at least, so an error
+		 * message is printed if the file doesn't exist
+		 */
 		run_command(MENUFILE);
+	} while (stat(MENUFILE, &s) == 0);
 
-	unreachable();
+	hang();
 }
 
 typedef void (*ctor_fn_t)(void);
-- 
2.39.5