Refactor archivers

[glitsj16]

Introduce archive-common.inc: common file for all archivers.
For now this WIP simply recreates existing archiver profiles.
It's intention is to:

• simplify adding new archiver profile(s);
• review potential inconsistencies in existing archiver profile(s).
  E.g. most have nogroups and have noroot commented, but a few divert from this pattern. I intend to do a follow-up review after extended testing, so for now this is a WIP.

[rusty-snake]

LGTM

[rusty-snake]

I think we can blacklist ${RUNUSER}.

[glitsj16]

@rusty-snake Thanks for having a look at this draft. I'm in the middle of testing all my archivers including their .local overrides. Will add blacklist ${RUNUSER} to the tests but indeed, I agree this shouldn't pose any problems. The plan is to bring existing profiles in an easier-to-change state using archive-common.inc as baseline and do specific changes in seperate PR's once this is merged. Shouldn't take all that long to get the first part finished.

[glitsj16]

@rusty-snake I added blacklist ${RUNUSER} to archiver-common.inc. What's the point in having that in combination with blacklist ${RUNUSER}/wayland-* again? I see such a doubling in several other profiles (curl, dig, drill, file, wget to name a few) but I can't say I actually understand the why. If ${RUNUSER} is blacklisted, shouldn't that imply ${RUNUSER}/wayland-* (and any other subdir for that matter) is blacklisted too?

[rusty-snake]

blacklist ${RUNUSER}/wayland-* is useless with blacklist ${RUNUSER} and can be simplified, that's right.

The profiles are written with this logic:

If not requires(X11) then
    If 'net none' then
        add 'x11 none'
    Else
        add 'blacklist /tmp/.X11-unix'
    Fi
Fi

If 'x11 none' or 'blacklist /tmp/.X11-unix' then
    add 'blacklist ${RUNUSER}/wayland-*'
Fi

If possible_to_add(wruc) then
    add wruc
Fi

If get_used_commands(wruc) == nil then
    replace wruc with 'blacklist ${RUNUSER}'
Fi

[glitsj16]

@rusty-snake Thanks for the explanation! I'll do the needed changes in a minute, before I forget. It sure is a luxury to have you on board :-)