[U-Boot] [PATCH] fastboot: Remove "bootloader-version" variable

[Eugeniu Rosca <roscaeugeniu@gmail.com>]

Hi Sam,

On Thu, Jun 20, 2019 at 05:00:01PM +0300, Sam Protsenko wrote:
> As per [1], there is no such fastboot variable as "bootloader-version".
> Only "version-bootloader" is supported. Let's reflect this and not
> confuse users further.
> 

FWIW, this could carry a Fixes line?
Fixes: 3aab70afc531d1 ("usb/gadget: add the fastboot gadget")

I strongly believe there are ongoing attempts/projects to build
relationships/dependencies between commits, which would help in the
context of bug prediction. Code Maat [2] comes to mind, but there could
be better examples.

> [1] https://android.googlesource.com/platform/system/core/+/master/fastboot/README.md#client-variables
[2] https://github.com/adamtornhill/code-maat 

In case AOSP gives it a second thought and drops or renames the
"is-userspace" option or the Client Variables section (both unlikely,
but possible), then the link will point to the wrong contents. This
happened to me in the past, but I am lazy to look for some records.

[..]

> diff --git a/doc/README.android-fastboot b/doc/README.android-fastboot
> index 431191c473..ce852a4fd1 100644
> --- a/doc/README.android-fastboot
> +++ b/doc/README.android-fastboot
> @@ -169,8 +169,8 @@ On the client side you can fetch the bootloader version for instance:
>  
>  ::
>  
> -   $ fastboot getvar bootloader-version
> -   bootloader-version: U-Boot 2014.04-00005-gd24cabc
> +   $ fastboot getvar version-bootloader
> +   version-bootloader: U-Boot 2014.04-00005-gd24cabc

I am afraid this may introduce confusion, specifically that v2014.04+
(more precisely v2014.04-207-g3aab70afc531) U-Boot responded properly
to 'fastboot getvar version-bootloader'. Please, feel free to ignore.

[..]

> @@ -37,12 +37,9 @@ static const struct {
>  	{
>  		.variable = "version",
>  		.dispatch = getvar_version
> -	}, {
> -		.variable = "bootloader-version",
> -		.dispatch = getvar_bootloader_version
>  	}, {

On one hand, I agree with Igor that certain users might be hurt by
this change. On the other hand, it sounds good not to spend time and
effort maintaining non-AOSP options, added to U-Boot by accident.

Reviewed-by: Eugeniu Rosca <erosca@de.adit-jv.com>

Thanks!

-- 
Best Regards,
Eugeniu.