Re: [gentoo-dev] Add Hooks to Eselect

[Redjard <gentoo-dev@redjard.org>]

On 2023-08-19 06:58:10, Michał Górny wrote:
> You have to provide the rationale here.  You can't expect people to sign
> up for some shady third-party service to read it.
My bad, not much of value is locked in the proprietary service but I 
should have stated as such.
To roughly summarize, I was asking for a method to hook into eselect, to 
modify the behavior of eselect kernel set.
I was pointed in the direction of a user patch by konsolebox, and 
consequently wrote the patch.
I provided an example for using the patched hooks, which I will repeat 
below.


 >>> /etc/eselect/hooks/kernel/set/pre:
if [ "$EUID" -ne 0 ]; then die "run as root please"; fi

local -n target=params

if [ -z "$target" ]; then
     target=`ls -1v /usr/src/ | grep '^linux-.*-gentoo$' | tail -n1`
else
     if [ `echo "$target" | grep -P "^\d+(\.\d+){2}$"` ]; then
         target=linux-"$1"-gentoo
     elif [ `echo "${target%/}" | grep -P 
"^linux-\d+(\.\d+){2}-gentoo$"` ]; then
         target="${target%/}"
     fi
fi

if [ "$target" == `basename "$(readlink /usr/src/linux)"` ]; then
     die "kernel $target already selected"
fi

cp /usr/src/linux/.config /tmp/redjard_linux_kernel_eselect_config

echo "selecting kernel $target"


 >>> /etc/eselect/hooks/kernel/set/post:
# (re)generate /etc/portage/sets/active_kernels which selects the 
active, the installed, and the selected kernel
/opt/startup/lock-active-kernel-versions

# stop if .config is already present,
if [[ -e /usr/src/linux/.config ]];then
         die "Warning: .config already exists. Stopping post hook 
execution, you're on your own"
fi

echo "migrating .config"
mv -n /tmp/redjard_linux_kernel_eselect_config /usr/src/linux/.config

oldfile=`sha512sum /usr/src/linux/.config`

#echo "use  make oldconfig  to migrate the kernel configuration"
echo "running  make oldconfig  to migrate .config"
(cd /usr/src/linux && make oldconfig)

if [[ "$oldfile" != `sha512sum /usr/src/linux/.config` ]]; then
         /opt/kernel/backup_config
fi

echo "use  kernel-configure  to edit the kernel configuration"
echo "use  kernel-make  or  kernel-install  to build and install the 
configured kernel"