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Add explanatory section to yavdr-xorg

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Alexander Grothe 2017-08-01 10:40:53 +02:00
parent 49bcc96702
commit a4a8573c09
1 changed files with 24 additions and 3 deletions
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Manual.org
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@ -24,13 +24,14 @@
#+LATEX_HEADER: \usepackage[margin=3.0cm]{geometry}
#+LATEX_HEADER: \usepackage[ngerman]{babel}
#+LATEX_HEADER: \usepackage{palatino}
#+LATEX_HEADER: \usepackage{inconsolata}
#+LATEX_HEADER: \renewcommand*\ttdefault{cmvtt}
#+LATEX_HEADER: \usepackage{rotating}
#+LATEX_HEADER: \usepackage{paralist}
#+LATEX_HEADER: \usepackage{booktabs}
#+LATEX_HEADER: \usepackage[locale=DE,seperr,repeatunits=true,trapambigerr=false,tophrase={{ bis }}]{siunitx}
#+LaTeX_HEADER: \usemintedstyle{lovelace}
#+LATEX_HEADER_EXTRA:
#+LATEX_HEADER: \usemintedstyle{lovelace}
#+LATEX_HEADER: \defaultfontfeatures{Ligatures=TeX}
# #+LATEX_HEADER_EXTRA:
:END:
* User Stories
@ -1007,6 +1008,26 @@ ctl.!default {
}
#+END_SRC
** yavdr-xorg
*** About the GUI session
**** Starting the X-server and the Session
The X-Server is started by using the two systemd units ~xlogin@.service~ and ~x@.service~ provided by the package *xlogin*.
The former is enabled (and started) for the vdr user - which results (using the default settings for the user *vdr* with the uid *666*) in the activation of ~xlogin@vdr.service~ when reaching the graphical.target.
~x@vt7.service~ is started automatically as a dependency of ~xlogin@vdr.service~ and starts the X-server.
~xlogin@vdr.service~ also starts a systemd user session using ~user@666.service~.
To prevent stopping the X-server when vdr is running, additional dependencies are set up - see the drop-in rules created in ~/etc/systemd/system/vdr.service.d/~.
Basic Services like the session DBus, pulseaudio etc. are started for the ~default.target~ of the session.
**** openbox autostart and yavdr-desktop.target
The openbox autostart script is used to update the systemd session with the needed session variables. It creates a file =~/.session-env= which is used as an environment file by ~vdr.service~ (so the vdr knows the *DISPLAY* and can access pulseaudio).
The autostart script then enables all services to be pulled in by yavdr-desktop.target. As the last step ~yavdr-desktop.target~ is startet, which results in staring ~yavdr-frontend.service~ and additional Units for a second display (openbox and a browser for osd2eb, if available).
**** yavdr-frontend
**** Shutdown of the Session
In order to achive a clean shutdown of the session, ~x@t7.service~ is set as a dependency of ~user@666.service~ and all processes within the session must be shutdown properly when stopping ~xlogin@vdr.service~.
If systemd units are used within the user session, they must stop their process(es) successfully (you should set them up to accept expected exit codes appropriately). The window manager /openbox/ is started using the =~/.xinitrc= and stopped using the systemd unit ~exit-wm.service~ (which runs on stopping the jobs pulled in by the ~default.target~ of the session).
*** TODO automatic X-server configuration
- [X] detect connected display
- [X] read EDID from displays