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Howto make grub respect the kernel symlink as default
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Massimo B.
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Joined: 09 Feb 2005
Posts: 1479
Location: Germany

PostPosted: Fri Sep 15, 2017 5:48 am    Post subject: Howto make grub respect the kernel symlink as default Reply with quote

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
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Joined: 04 Aug 2005
Posts: 500
Location: France

PostPosted: Mon Sep 25, 2017 12:53 pm    Post subject: Reply with quote

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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