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Yevhenii Nadtochii
Asked: 2020-06-16 02:43:19 +0800 CST

Redirect output of systemd service to Ubuntu Boot Screen (20.04)

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I have a systemd service that performs sync between local disk and Cloud Storage during shutdown. Something like this:

[Unit]
Description=Syncing with MEGA cloud storage v56
After=network-online.target

[Service]
...
ExecStart=/bin/true
ExecStop=/usr/local/sbin/auto-sync.sh
RemainAfterExit=true
TimeoutStopSec=0
...
 
[Install]
WantedBy=multi-user.target

Now, I've upgraded to Ubuntu 20.04 and during Ubuntu shutdown\boot see only black screen with 'Ubuntu' inscription in the bottom. I don't have any vendor image. And I'm wondering If I can redirect output of my auto-sync.sh script to Ubuntu shutdown screen.

The best option here would be to arrange some square in the center of the screen and print there white text just like any console/terminal does. So, I have several questions:

  1. Is something like that possible at all ?
  2. Could it be done just with Bash and some Ubuntu\Gnome configuration ?
  3. May be I have to write a separate application ?

Any thoughts\idea\guidelines are welcome! Thank you!

gnome shutdown boot desktop-environments

1 Answers

  1. This is discussed at length in Unix & Linux site:

    For a systemd service you need a TTYPath=/dev/console and a StandardOutput=tty in the .INI file to change this, StandardInput=tty if you want to read (but you do not) as well as write. Witness systemd's pre-supplied debug-shell.service.

    There is a lot more in the link as well as additional sources linked in.

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