[PATCH] env: Fix warning when forcing environment without ENV_ACCESS_IGNORE_FORCE

[Tom Rini <trini@konsulko.com>]

On Mon, Jan 11, 2021 at 11:27:20AM +0100, Martin Fuzzey wrote:

> Since commit 0f036bf4b87e ("env: Warn on force access if ENV_ACCESS_IGNORE_FORCE set")
> a warning message is displayed when setenv -f is used WITHOUT
> CONFIG_ENV_ACCESS_IGNORE_FORCE, but the variable is set anyway, resulting
> in lots of log pollution.
> 
> env_flags_validate() returns 0 if the access is accepted, or non zero
> if it is refused.
> 
> So the original code
> 	#ifndef CONFIG_ENV_ACCESS_IGNORE_FORCE
> 		if (flag & H_FORCE)
> 			return 0;
> 	#endif
> 
> was correct, it returns 0 (accepts the modification) if forced UNLESS
> IGNORE_FORCE is set (in which case access checks in the following code
> are applied). The broken patch just added a printf to the force accepted
> case.
> 
> To obtain the intent of the patch we need this:
> 	if (flag & H_FORCE) {
> 	#ifdef CONFIG_ENV_ACCESS_IGNORE_FORCE
> 		printf("## Error: Can't force access to \"%s\"\n", name);
> 	#else
> 		return 0;
> 	#endif
> 	}
> 
> Fixes: 0f036bf4b87e ("env: Warn on force access if ENV_ACCESS_IGNORE_FORCE set")
> 
> Signed-off-by: Martin Fuzzey <martin.fuzzey@flowbird.group>
> ---
>  env/flags.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/env/flags.c b/env/flags.c
> index df4aed2..e3e833c 100644
> --- a/env/flags.c
> +++ b/env/flags.c
> @@ -563,12 +563,13 @@ int env_flags_validate(const struct env_entry *item, const char *newval,
>  		return 1;
>  #endif
>  
> -#ifndef CONFIG_ENV_ACCESS_IGNORE_FORCE
>  	if (flag & H_FORCE) {
> +#ifdef CONFIG_ENV_ACCESS_IGNORE_FORCE
>  		printf("## Error: Can't force access to \"%s\"\n", name);
> +#else
>  		return 0;
> -	}
>  #endif
> +	}
>  	switch (op) {
>  	case env_op_delete:
>  		if (item->flags & ENV_FLAGS_VARACCESS_PREVENT_DELETE) {

Marek, does this look right to you?  Heinrich, I think this means
there''s a follow-up commit that I made to one of the tests that can
probably be reverted as well?  Thanks for digging in to this Martin!

-- 
Tom
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