[systemd-devel] nsapwned container terminal background color

[Zbigniew Jędrzejewski-Szmek]

On Sun, Mar 19, 2017 at 04:37:53PM +0000, arnaud gaboury wrote:
> I am trying with no success to have one background terminal color for the
> host and another one for the container.
> 
> Some settings:
> - on host:
> window manager : i3
> terminal : urxvt-256
> 
> -on container:
> no X, it is a server.
> 
> Until now, I have tried to write a wrapper script to urxvt on host. This
> script is to test value of $HOST or $TERM, then fire urxvt with background
> color as option. This does not work.
> 
> I have to figure out  that when i log my container, I am first on an urxvt
> terminal which become, once I am logged as user on container, a xterm.
> I am totally lost where to write instruction as the terminal color
> background: on host or container? and what app shall be tested to set the
> environment and decide the bg color (agetty?) ?

Are you starting the container manually using systemd-nspawn in a terminal
emulator window? If yes, then the following works (tested with gnome-terminal,
but I think urxvt supports the same sequences):

[Unit]
DefaultDependencies=no
Conflicts=shutdown.target

[Service]
StandardOutput=tty
ExecStart=/usr/bin/printf '\033]11;darkgreen\007'
ExecStop=/usr/bin/printf '\033]11;black\007'
Type=oneshot
RemainAfterExit=true

[Install]
WantedBy=basic.target

(It would be nicer to undo the setting and return to whatever the old
background was, but I don't know how to do this.)

If you are logging into an existing container using machinectl shell
or ssh, you can just the equivalent printfs to your ~/.profile.

Zbyszek