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I have a custom variable in one of my modules and I want to be able to give permission to that variable to a specific role on my site.

I have the hook_permission function setup and I can see it in the admin/people/permissions interface, but I'm not sure how to implement a hook or whatever to give the user access to admin/config/system/variable/edit/my_custom_variable

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  • I don't have "variable" in my "admin/config/system" path. What module are you using to provide direct variable editing capabilities?
    – Mołot
    Oct 1, 2013 at 13:07
  • He's using the variable drupal.org/project/variable module.
    – Steven
    Oct 1, 2013 at 13:09

2 Answers 2

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One method would be to use something like https://drupal.org/project/config_perms to add a custom permission to the admin/config/system/variable/edit/my_custom_variable path. You can then use this custom permission to grant access to it.

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In hook_menu we have:

$items['admin/config/system/variable/edit/%'] = array(
  'title' => 'Edit variable',
  'page callback' => 'drupal_get_form',
  'page arguments' => array('variable_edit_form', 5),
  'access callback' => 'variable_access',
  'access arguments' => array(5),
);

Now, what's 'access callback'? By the API:

"access callback": A function returning TRUE if the user has access rights to this menu item, and FALSE if not. It can also be a boolean constant instead of a function, and you can also use numeric values (will be cast to boolean). Defaults to user_access() unless a value is inherited from the parent menu item; only MENU_DEFAULT_LOCAL_TASK items can inherit access callbacks. To use the user_access() default callback, you must specify the permission to check as 'access arguments' (see below).

So the module is using function variable_access($variable, $account = NULL) defined in the main variable.module. Now, this function uses data provided by function variable_get_info($name = NULL, $options = array()), that collects it's data from modules that implements hook_variable_info().

TL;DR

In hook_variable_info() when defining your variable, set 'access' to an existing permission, or permission your module provides. Then simply give that permission to user roles that should be able to edit variable.

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