Environment helpers: function to set environment variable? #149
Description
Feature request
It would be nice to have a way to set environment variables. I have at least one use-case in ros2/domain_bridge#60 (comment).
Feature description
A function that allows setting a named environment variable; essentially a dual of rcpputils::get_env_var.
Implementation considerations
It could be implemented exactly how rcpputils::get_env_var is implemented, by invoking the corresponding rcutils environment helper function.
One approach:
bool set_env_var(const char * env_var, const char * env_value)
{
if (!rcutils_set_env(env_var, env_value)) {
std::string err = rcutils_get_error_string().str;
// Resetting the error state since error string has been extracted
rcutils_reset_error();
throw std::runtime_error(err);
}
return true;
}