sys-kernel/gentoo-kernel automatically call grub-mkconfig ?

[james.h.bates]

I used fulldisk encryption and LVM, an appropriate initramfs image I build with dracut, grub to boot, and a heavily customized kernel config. I used to use sys-kernel/gentoo-sources, which meant manually running make oldconfig & make in the kernel src tree, installing manually, calling dracut manually, and calling grub-mkconfig manually.

Recently (yesterday) I discovered sys-kernel/gentoo-kernel, which actually does 99% of this for me. Using savedconfig I can still use my custom kernel config, and I've setup a /etc/dracut.conf such that the initramfs image is built as I want it, automatically. All working great.

The only thing missing, is to call grub-mkconfig -o /boot/grub/grub.cfg at the end, to add the newly installed kernel & initramfs to my boot menu. Is there someway, I can have that happen automatically when sys-kernel/gentoo-kernel is updated? If so, my kernel upgrades would be 100% automatic upon emerge -u @world, which would be brilliant...

Any help would be appreciated

[DespLock]

Easiest thing would be to wrap your emerge in a shell script and add the grub command at last. Like update.sh

[Ionen]

gentoo-kernel first merges the (stripped) sources alongside the kernel in /usr/src/, then in pkg_postinst() it'll call /sbin/installkernel (default provided by installkernel-gentoo) to copy the kernel to /boot, roughly the same `make install` would do.

This installkernel script itself runs any executable scripts in /etc/kernel/postinst.d/* with $1 being kernel version, and $2 path to the kernel.

These scripts can be used for whatever needed, grub setup, efi stub installs, cleaning or backing up old kernels/modules, etc... With a little work most things can be automated if not a too exotic setup, and with the new USE=dist-kernel even third party modules get rebuilt without user workarounds now (albeit need portage >=3.0.13 to solve a portage bug when multiple modules).

[james.h.bates]