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Massimo B.
Veteran
Joined: 09 Feb 2005
Posts: 1816
Location: PB, Germany
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 Posted: Fri Sep 15, 2017 5:48 am Post subject: Howto make grub respect the kernel symlink as default |
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Howto make grub respect the kernel symlink as default
Many tools like genkernel still create the /boot/kernel symlinks, at least when using SYMLINK="yes" in genkernel.conf. However when building my new kernel like this
| Code: | | genkernel all --makeopts="-j4 -l8" --loglevel=4 && grub-mkconfig -o /boot/grub/grub.cfg |
the grub-mkconfig does not respect this link but does it's own alphabetical sorting. While I have different kernels prepared grub by default would choose the -gentoo kernel being alphabetically first and not my preferred kernel:
| Code: | # ls -l /boot/kernel*
lrwxrwxrwx 1 root root 34 Sep 14 16:11 /boot/kernel -> kernel-genkernel-x86_64-4.13.0-pf2
-rw-r--r-- 1 root root 4,3M Mai 4 13:32 /boot/kernel-genkernel-x86_64-4.10.13-ck
-rw-r--r-- 1 root root 4,4M Sep 14 16:11 /boot/kernel-genkernel-x86_64-4.13.0-pf2
-rw-r--r-- 1 root root 4,4M Sep 14 15:46 /boot/kernel-genkernel-x86_64-4.13.0-pf2.old
-rw-r--r-- 1 root root 4,4M Sep 13 12:06 /boot/kernel-genkernel-x86_64-4.13.1-gentoo |
After struggling with GRUB_DEFAULT= in /etc/default/grub and numbers, I found that you can set that to "saved", so this is my approach to always boot the symlinked kernel by default:
| Code: | # cat /etc/grub.d/40_custom
#!/bin/sh
exec tail -n +3 $0
# This file provides an easy way to add custom menu entries. Simply type the
# menu entries you want to add after this comment. Be careful not to change
# the 'exec tail' line above.
menuentry 'Gentoo GNU/Linux, current kernel' --class gentoo --class gnu-linux --class gnu --class os $menuentry_id_option 'gentoo-current' {
load_video
insmod gzio
insmod part_msdos
insmod ext2
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root 430c4991-31e4-41db-940a-8d733834d5f6
else
search --no-floppy --fs-uuid --set=root 430c4991-31e4-41db-940a-8d733834d5f6
fi
echo 'Loading current Gentoo-Linux ...'
linux /kernel root=/dev/mapper/root ro rootflags=subvol=root keymap=de splash=silent,theme:livecd-2007.0 console=tty1 quiet crypt_root=UUID=e609e76c-419f-4677-ff00-872290730e6f root=LABEL=gentoo dobtrfs
echo 'Loading initial ramdisk ...'
initrd /initramfs
} |
| Code: | # grep GRUB_DEFAULT /etc/default/grub
GRUB_DEFAULT="saved"
# grub-set-default gentoo-current
# head -n2 /boot/grub/grubenv
# GRUB Environment Block
saved_entry=gentoo-current |
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Syl20
l33t
Joined: 04 Aug 2005
Posts: 621
Location: France
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| Posted: Mon Sep 25, 2017 12:53 pm Post subject: |
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Interesting. 
That said, there's also the "good old" solution. You can write a correct (and so much simplier...) grub.cfg file by hand, and completely forget grub-mkconfig. |
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