[PATCH] common: bootm: only use initrd override if non-empty

[chalianis1@gmail.com]

From: Chali Anis <chalianis1@gmail.com>

OSTree integration in Yocto generates an empty initramfs
file and references it in the boot configuration (under
/boot/loader/ostree-1.conf) to suppress init= kernel arguments.
This caused Barebox to always prefer the override, even when
the initramfs was empty, preventing booting of FIT images
that already contain an embedded initramfs.

Signed-off-by: Chali Anis <chalianis1@gmail.com>
---
 common/bootm.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/common/bootm.c b/common/bootm.c
index 3a2eb262b26a..f31ef546d92c 100644
--- a/common/bootm.c
+++ b/common/bootm.c
@@ -279,14 +279,18 @@ static int bootm_open_initrd_uimage(struct image_data *data)
 const struct resource *
 bootm_load_initrd(struct image_data *data, unsigned long load_address)
 {
+	struct stat st;
 	enum filetype type;
 	int ret;
 
 	if (!IS_ENABLED(CONFIG_BOOTM_INITRD))
 		return NULL;
 
-	if (bootm_get_override(&data->initrd_file, bootm_overrides.initrd_file))
-		goto initrd_file;
+	if (bootm_get_override(&data->initrd_file,
+			       bootm_overrides.initrd_file)) {
+		if (!stat(data->initrd_file, &st) && st.st_size > 0)
+			goto initrd_file;
+	}
 
 	if (data->initrd_res)
 		return data->initrd_res;
-- 
2.34.1