Grub use vmlinuz. not specific versions, also upgrade kernel script

[NiKiZe]

To have portable config that don't require regeneration
In /etc/default/grub add

GRUB_LINUX_KERNEL_GLOBS="/boot/vmlinuz /boot/vmlinuz.old"

Also for upgrade provide script similar to:

cd /; sh /portagehelper.sh
mount /boot; mount /boot/efi
oldkernel=$(realpath /usr/src/linux)
emerge -ug1 iptables
USE=symlink emerge -ug1 gentoo-sources
eselect kernel list
cd /usr/src/linux
cp $oldkernel/.config .
echo -e xy| make menuconfig -j8
diff -u $oldkernel/.config .config
make -j16 bzImage modules; make -j16 modules_install install
emerge @module-rebuild
emerge -P gentoo-sources
emerge -uvg1 eclean-kernel
eclean-kernel

[NiKiZe]

Reopening to possibly work on the script

[NiKiZe]

#91 is broken again since it seems the GLOB was refactored
Ah lovely "!¤#%"#¤%"¤#% https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=c5b2126e88c412a9c43009064250516f2f1fa2e6

[NiKiZe]

Also stop using GRUB_CMDLINE_LINUX_DEFAULT and instead use GRUB_CMDLINE_LINUX
The former is only used in normal mode, while GRUB_CMDLINE_LINUX is used for both normal and recovery modes

[NiKiZe]

lets use installkernel with grub use flag,
but also simply emerge graph, and hack the 10_linux file

[NiKiZe]

I had no graphics on T450s, new grub 2.14 might have broken something compared to 2.12
Make the startup less complex, we don't need or want any fancy graphics
GRUB_GFXPAYLOAD_LINUX=keep
GRUB_TERMINAL=console
maybe GRUB_VIDEO_BACKEND="efi_gop"

With this change maybe we can restore the default grub USE flags, and simply don't care

[NiKiZe]

Potential basis for update script

#!/bin/bash

OLD_SRCDIR=$(readlink -f /usr/src/linux)
if [ ! -f "$OLD_SRCDIR/.config" ]; then
    echo "No .config found in $OLD_SRCDIR. Nothing to migrate."
    exit 1
fi

# app-admin/eclean-kernel dosn't do a great job
emerge -ug1 sys-kernel/gentoo-sources -j2

NEW_SRCDIR=$(ls -dv /usr/src/linux-*-gentoo | sort -V | tail -n 1)
if [ "$OLD_SRCDIR" == "$NEW_SRCDIR" ]; then
    echo "No new kernel version installed. Already on $NEW_SRCDIR."
    # TODO detect running kernel, check /boot/vmlinuz.old and do cleanup accordingly
    # uname -r gets current
    # check /usr/src for linux-*
    # mount /boot and clean *version (ex *-6.19.10-gentoo)
    # clean /usr/src/linux-$ver
    # rm -rf /lib/modules/$ver
    # emerge -P gentoo-sources:($ver strip -gentoo)
    exit 0
fi

if [ -f "$NEW_SRCDIR/.config" ]; then
    echo "Error: .config already exists in $NEW_SRCDIR"
    exit 1
fi

echo "Updating symlink and migrate .config to $(basename "$NEW_SRCDIR")..."
eselect kernel set $(eselect kernel list | grep -F "$(basename "$NEW_SRCDIR")" | awk -F'[][]' '{print $2}')

cp "$OLD_SRCDIR/.config" "$NEW_SRCDIR/"
cd "$NEW_SRCDIR" || exit 1
echo -e "x\ny" | make menuconfig
diff -u "$OLD_SRCDIR/.config" .config

for m in $(awk '$1 !~ /^#/ && $2 ~ /^\/boot/ {print $2}' /etc/fstab | sort -u); do grep -qE "[[:space:]]${m}[[:space:]]" /proc/mounts || mount "$m"; done
time pv -l -btc > /dev/null < <(make -j$(($(nproc) + 2)) bzImage modules) && make modules_install && make install

emerge @module-rebuild
# TODO check uname for running kernel and only remove older after reboot
#emerge -P gentoo-sources
#eclean-kernel