[User services] Some expected environment variables are filtered out

[NyaomiDEV]

When starting user services, some environment variables that should be present and available to the services being started are filtered out by openrc. This causes observable breakage in some scenarios, such as opening Yakuake on a Plasma session.

The environment variables that are important and currently left out are HOME, USER and SHELL, however we should probably pass the entire user environment as-is to the services (since it comes from PAM env + login shell as far as I've understood - so it's identical to what an user would get upon login)

[navi-desu]

HOME is not being filtered, but USER and SHELL are

since it comes from PAM env + login shell as far as I've understood - so it's identical to what an user would get upon login

not quite, since calling rc-service foo start from a shell would import that shell's enviroment. and even at login, i'm unsure if random environment variables from the user's .profile should go through at all

noting system services do load /etc/profile.env though