[PATCH] bbu: command: update via TFTP if no image given

[Sascha Hauer]

On Mon, Jul 01, 2024 at 09:14:55AM +0200, Ahmad Fatoum wrote:
> Booting barebox over TFTP is a common operation that even has a default
> boot target: `boot bnet`.
> 
> Once, a chainloaded barebox was tested to work, it may need to be
> persisted, which needs a cumbersome:
> 
>   barebox_update /mnt/tftp/${global.user}-barebox-${global.hostname}
> 
> Make this more straight-forward by interpreting barebox_update called
> without any non-option argument to mean just that.
> 
> Signed-off-by: Ahmad Fatoum <a.fatoum at pengutronix.de>
> ---
>  commands/barebox-update.c | 11 ++++++++---
>  1 file changed, 8 insertions(+), 3 deletions(-)
> 
> diff --git a/commands/barebox-update.c b/commands/barebox-update.c
> index 4b23433e84f2..59db315e5650 100644
> --- a/commands/barebox-update.c
> +++ b/commands/barebox-update.c
> @@ -6,6 +6,7 @@
>  #include <common.h>
>  #include <command.h>
>  #include <libfile.h>
> +#include <globalvar.h>
>  #include <getopt.h>
>  #include <malloc.h>
>  #include <errno.h>
> @@ -20,6 +21,7 @@ static void print_handlers_list(void)
>  
>  static int do_barebox_update(int argc, char *argv[])
>  {
> +	char pathbuf[PATH_MAX];

Do we really want to allocate 1KiB on the stack?

sascha

>  	int opt, ret, repair = 0;
>  	struct bbu_data data = {};
>  	struct bbu_handler *handler;
> @@ -82,14 +84,17 @@ static int do_barebox_update(int argc, char *argv[])
>  
>  	if (argc - optind > 0) {
>  		data.imagefile = argv[optind];
> +	} else if (!repair) {
> +		snprintf(pathbuf, sizeof(pathbuf), "/mnt/tftp/%s-barebox-%s",
> +			 globalvar_get("user"), globalvar_get("hostname"));
> +		data.imagefile = pathbuf;
> +	}
>  
> +	if (data.imagefile) {
>  		image = read_file(data.imagefile, &data.len);
>  		if (!image)
>  			return -errno;
>  		data.image = image;
> -	} else {
> -		if (!repair)
> -			return COMMAND_ERROR_USAGE;
>  	}
>  
>  	ret = barebox_update(&data, handler);
> -- 
> 2.39.2
> 
> 
> 

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