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Date: Tue, 28 Jan 2020 10:05:21 +0000
From: Nero <nero@w1r3.net>
To: ~alpine/devel@lists.alpinelinux.org
Subject: Re: WIP: trying to add consolefont in mkinitfs
Message-ID: <20200128100521.GA12136@lucy.icvn.de>
References: <b2a9ae88-ed2c-b77a-3987-e3a3f52e3da0@malikania.fr>
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Hi,

On Tue, Jan 28, 2020 at 10:23:48AM +0100, David Demelier wrote:
> Hello all,
>=20
> I'm trying to create an additional features for mkinitfs, including setfo=
nt
> + console fonts.
>=20
> Why? Because on some laptops with high dpi screens, the initramfs may ask
> passphrase for cryptsetup or show an emergency shell. On my laptop this is
> barely usable by default.
>=20
> Thus, I've created a /etc/mkinitfs/features.d/consolefont with
>=20
> /etc/conf.d/consolefont
> /usr/sbin/setfont
> /usr/share/consolefonts/*.psf.gz
>=20
> Then, updated initramfs-init just before the first message [0]
>=20
> --- initramfs-init.orig
> +++ initramfs-init
> @@ -353,6 +353,7 @@
>         done
>  done
>=20
> +# Just for testing yet.
> +setfont /usr/share/consolefonts/ter-224n.psf.gz
>  [ "$KOPT_quiet" =3D yes ] || echo "Alpine Init $VERSION"
>=20
>  # enable debugging if requested
>=20
> I've enabled consolefont in my mkinitfs.conf and rebooted.
>=20
> At boot setfont complained that /dev/tty does not exist even though print=
ing
> on the screen does not work and cryptsetup asks the passphrase so... I'm
> unable to understand how can I achieve this. Is it possible to create a
> /dev/tty node? Should mdev be enabled earlier?
>=20
> [0]: https://git.alpinelinux.org/mkinitfs/tree/initramfs-init.in#n355
>=20
> Any help is welcomed.

The stdio of the /init script in the initramfs is connected to /dev/console,
which does not have all of the functionality a usual tty is expected to hav=
e.

Internally, /dev/console is wired to output on all tty devices that are
specified via the console=3D kernel boot parameter.

Despite this, the /dev/tty should be available from the devtmpfs. Maybe it
might help to insert /bin/sh into the initramfs script to start an
interactive shell and poke around manually with `setfont`. Having `strace`
in the initramfs might be handy there.

Also, maybe its worth trying with /dev/tty0 (current virtual console). Sett=
ing
the font is an operation that only applies to the linux virtual consoles.
/dev/tty (current console) might end up pointing to some serial line.

--
Nero

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