Warning in provision_posix_groupname

Problem/Motivation

Trying to access array offset on value of type bool provision.inc:391

This is because of:

function provision_posix_groupname($group) {
  // TODO: make these singletons with static variables for caching.
  // we do this both ways, so that the function returns NULL if no such user was found.
  if (is_numeric($group)) {
    $info = posix_getgrgid($group);
    $group = $info['name'];
  }
  else {
    $info = posix_getgrnam($group);
    $group = $info['name'];
  }
  return $group;
}

Specifically posix_getgrnam doesn't always return an array.

Steps to reproduce

Proposed resolution

Remaining tasks

User interface changes

API changes

Data model changes