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Re: variable hooks & global variables

From: Robert Millan
Subject: Re: variable hooks & global variables
Date: Thu, 3 Jan 2008 16:05:58 +0100
User-agent: Mutt/1.5.13 (2006-08-11)

On Thu, Jan 03, 2008 at 04:03:11PM +0100, Robert Millan wrote:
> When you set a variable hook (grub_register_variable_hook), this hook isn't
> preserved after someone (e.g. configfile command) opens a new context
> (grub_env_context_open), unless the variable has been set as global
> (grub_env_export).
> Is this what we want?
> The only current user of variable hooks is "root" variable, and that hook
> contains a sanity check that seems to be more suitable for global scope.
> The color-related variables for which I wanted to add hooks would also
> like to keep their hooks across contexts.
> One option is to export these variables, or to modify grub_env_context_open()
> to preserve hooks as well as exported variables.  I'm more inclined for the
> latter.
> Comments?

Erm, ignore the part about global variables.  Exporting them doesn't help:

      for (var = context->prev->vars[i]; var; var = var->next)
          if (var->type == GRUB_ENV_VAR_GLOBAL)
            if (grub_env_set (var->name, var->value) != GRUB_ERR_NONE)
                grub_env_context_close ();
                return grub_errno;

So, we just preserve hooks ?

Robert Millan

<GPLv2> I know my rights; I want my phone call!
<DRM> What use is a phone call, if you are unable to speak?
(as seen on /.)

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