implement rads (ram adjusted desktop starter) systemd unit

[adrelanos]

Introduction:

rads stands for RAM Adjusted Desktop Starter

• rads documentation
• rads github
• Used by and useful for the Linux distribution Whonix, which is primarily run inside virtual machines

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Issues:

• rads forces to keep tty0 open -> solved in rads systemd branch
• rads tty0 still running after it started a graphical login manager (creates confusion: bug report) -> solved in rads systemd branch
• rads is broken on jessie that uses systemd -> TODO

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Solution:

A good approach to solve this could be to run rads before getty using systemd. [1]

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TODO:

• /usr/lib/ram_adjusted_desktop_starter/ram_adjusted_desktop_starter needs to be started by a systemd unit before getty
• it needs to have stdout connected, so users can read output by rads
• it needs to have stdin connected, so users can interact with rads
• output by other boot processes should not mix up with output by rads
• build upon the rads systemd branch, because it already solves most of above issues

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Footnotes:

[1] Could work similar as whonix-initializer systemd unit:
https://github.com/Whonix/whonix-initializer/blob/master/lib/systemd/system/whonix-initializer.service
(whonix-initializer runs as an "app" during first boot. Its systemd unit is configured to wait until whonix-initializer finished.)

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Bounty too low?:

1. Go to https://www.bountysource.com/issues/14466761-implement-rads-ram-adjusted-desktop-starter-systemd-unit
2. Click on "Developers"
3. Click on "Get Started"
4. Select Status "Bounty too low"
5. Enter your offer and press "Save".

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Mirrored from:
https://phabricator.whonix.org/T57

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Mirrored to:
#1

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On bountysource:
https://www.bountysource.com/issues/14466761-implement-rads-ram-adjusted-desktop-starter-systemd-unit

[adrelanos]

Done, ported to systemd; refactoring - https://phabricator.whonix.org/T57:
4d6de00