[PATCH] efi_loader: Run dhcp if an http boot option is selected

[Ilias Apalodimas]

The EFI boot manager relies on having an IP address before trying to
boot an EFI HTTP(s) boot entry. However, defining it as a boot or
pre-boot command is not always the right answer since it will
unconditionally add delay to the board boot, even if we don't boot
over the network.

So let's do a DHCP request from the boot manager, if 'ipaddr' is
empty and fail early if we don't have an address.

Signed-off-by: Ilias Apalodimas <ilias.apalodimas at linaro.org>
---
 lib/efi_loader/efi_bootmgr.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/lib/efi_loader/efi_bootmgr.c b/lib/efi_loader/efi_bootmgr.c
index c0df5cb9acd9..2076630648f7 100644
--- a/lib/efi_loader/efi_bootmgr.c
+++ b/lib/efi_loader/efi_bootmgr.c
@@ -479,6 +479,13 @@ static efi_status_t try_load_from_uri_path(struct efi_device_path_uri *uridp,
 	if (!ctx)
 		return EFI_OUT_OF_RESOURCES;

+	s = env_get("ipaddr");
+	if (!s && dhcp_run(0, NULL, false)) {
+		log_err("Error: Can't find a valid IP address\n");
+		ret = EFI_DEVICE_ERROR;
+		goto err;
+	}
+
 	s = env_get("loadaddr");
 	if (!s) {
 		log_err("Error: loadaddr is not set\n");
--
2.49.0