[v3,2/5] mkimage: fit_image: handle multiple errors when writing signatures

From: Heiko Stuebner <heiko.stuebner at theobroma-systems.com>

fit_image_write_sig() contains mostly functions from libfdt that
return FDT_ERR_foo errors but also a call to fit_set_timestamp()
which returns a regular error.

When handling the size increase via multiple iterations, check
for both -FDT_ERR_NOSPACE but also for -ENOSPC.

There is no real conflict, as FDT_ERR_NOSPACE = 3 = ESRCH
(No such process) and ENOSPC = 28 which is above any FDT_ERR_*.

Signed-off-by: Heiko Stuebner <heiko.stuebner at theobroma-systems.com>
Reviewed-by: Simon Glass <sjg at chromium.org>
Reviewed-by: Kever Yang <kever.yang at rock-chips.com>
---
 tools/image-host.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Hi Heiko,

On Tue, 26 May 2020 at 04:44, Heiko Stuebner <heiko at sntech.de> wrote:
>
> From: Heiko Stuebner <heiko.stuebner at theobroma-systems.com>
>
> fit_image_write_sig() contains mostly functions from libfdt that
> return FDT_ERR_foo errors but also a call to fit_set_timestamp()
> which returns a regular error.
>
> When handling the size increase via multiple iterations, check
> for both -FDT_ERR_NOSPACE but also for -ENOSPC.
>
> There is no real conflict, as FDT_ERR_NOSPACE = 3 = ESRCH
> (No such process) and ENOSPC = 28 which is above any FDT_ERR_*.
>
> Signed-off-by: Heiko Stuebner <heiko.stuebner at theobroma-systems.com>
> Reviewed-by: Simon Glass <sjg at chromium.org>
> Reviewed-by: Kever Yang <kever.yang at rock-chips.com>
> ---
>  tools/image-host.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

Changing my mind on this - I wonder if we can change
fit_image_write_sig() to always return an errno code, never an FDT
code? Could be a follow-on patch.

>
> diff --git a/tools/image-host.c b/tools/image-host.c
> index 9a83b7f675..baf9590f3b 100644
> --- a/tools/image-host.c
> +++ b/tools/image-host.c
> @@ -241,7 +241,7 @@ static int fit_image_process_sig(const char *keydir, void *keydest,
>         ret = fit_image_write_sig(fit, noffset, value, value_len, comment,
>                         NULL, 0, cmdname);
>         if (ret) {
> -               if (ret == -FDT_ERR_NOSPACE)
> +               if (ret == -FDT_ERR_NOSPACE || ret == -ENOSPC)
>                         return -ENOSPC;
>                 printf("Can't write signature for '%s' signature node in '%s' conf node: %s\n",
>                        node_name, image_name, fdt_strerror(ret));
> --
> 2.25.1
>

Regards,
Simon