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fix: make GRUB serial console conditional on hardware availability

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Unconditionally enabling serial terminal broke gfxterm on EFI systems
without a serial port. Now installs a /etc/grub.d/01_serial script
that probes for the serial port before enabling it. Also copies
unicode.pf2 font to boot partition for GRUB graphical mode.
This commit is contained in:
Aiden McClelland
2026-03-09 23:54:48 -06:00
parent 3441d4d6d6
commit 9546fc9ce0
1 changed files with 23 additions and 6 deletions
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29
debian/startos/postinst vendored
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@@ -28,13 +28,12 @@ if [ -f /etc/default/grub ]; then
sed -i '/\(^\|#\)'"$1"'=/d' /etc/default/grub sed -i '/\(^\|#\)'"$1"'=/d' /etc/default/grub
printf '%s="%s"\n' "$1" "$2" >> /etc/default/grub printf '%s="%s"\n' "$1" "$2" >> /etc/default/grub
} }
# Enable both graphical and serial terminal output # Graphical terminal (serial added conditionally via /etc/grub.d/01_serial)
grub_set GRUB_TERMINAL_INPUT 'console serial' grub_set GRUB_TERMINAL_INPUT 'console'
grub_set GRUB_TERMINAL_OUTPUT 'gfxterm serial' grub_set GRUB_TERMINAL_OUTPUT 'gfxterm'
# Remove GRUB_TERMINAL if present (replaced by INPUT/OUTPUT above) # Remove GRUB_TERMINAL and GRUB_SERIAL_COMMAND if present
sed -i '/^\(#\|\)GRUB_TERMINAL=/d' /etc/default/grub sed -i '/^\(#\|\)GRUB_TERMINAL=/d' /etc/default/grub
# Serial console settings sed -i '/^\(#\|\)GRUB_SERIAL_COMMAND=/d' /etc/default/grub
grub_set GRUB_SERIAL_COMMAND 'serial --unit=0 --speed=115200 --word=8 --parity=no --stop=1'
# Graphics mode and splash background # Graphics mode and splash background
grub_set GRUB_GFXMODE 800x600 grub_set GRUB_GFXMODE 800x600
grub_set GRUB_GFXPAYLOAD_LINUX keep grub_set GRUB_GFXPAYLOAD_LINUX keep
@@ -49,6 +48,24 @@ if [ -f /etc/default/grub ]; then
mkdir -p /boot/grub/startos-theme mkdir -p /boot/grub/startos-theme
cp -r /usr/lib/startos/grub-theme/* /boot/grub/startos-theme/ cp -r /usr/lib/startos/grub-theme/* /boot/grub/startos-theme/
fi fi
# Copy font to boot partition so GRUB can load it without accessing rootfs
if [ -f /usr/share/grub/unicode.pf2 ]; then
mkdir -p /boot/grub/fonts
cp /usr/share/grub/unicode.pf2 /boot/grub/fonts/unicode.pf2
fi
# Install conditional serial console script for GRUB
cat > /etc/grub.d/01_serial << 'GRUBEOF'
#!/bin/sh
cat << 'EOF'
# Conditionally enable serial console (avoids breaking gfxterm on EFI
# systems where the serial port is unavailable)
if serial --unit=0 --speed=115200 --word=8 --parity=no --stop=1; then
terminal_input console serial
terminal_output gfxterm serial
fi
EOF
GRUBEOF
chmod +x /etc/grub.d/01_serial
fi fi
VERSION="$(cat /usr/lib/startos/VERSION.txt)" VERSION="$(cat /usr/lib/startos/VERSION.txt)"