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Having a shell on tty2 or hvc1 is convenient.. if you have tty2 or hvc1.
But not everyone does - think s390, or POWER, or remote virt guests.
Instead, let's run anaconda inside a tmux session, with windows
pre-configured with a shell, anaconda.log, program.log, and storage.log.
We set this up by using two services: anaconda.service, and
anaconda-tmux@.service.
anaconda.service starts anaconda (and starts watching the logs) inside a
detached tmux session, on screen 1. It also starts a shell on screen 2,
and 'tail -F' on anaconda.log, storage.log, and program.log on screens
3, 4, and 5.
anaconda-tmux@.service will be instantiated on the default console
(tty1, hvc0, ttyS0, whatever) and connect to the running tmux session,
which will show screen 1 - and thus the text UI (if any) appears.
Exiting tmux just restarts anaconda-tmux@.service, which reconnects to
the existing session, so you can't accidentally kill the installer by
leaving tmux.
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