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DaggyStyle
Watchman
Joined: 22 Mar 2006
Posts: 5910
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 Posted: Thu Oct 15, 2020 9:49 pm Post subject: add special entry in grub for latest kernel [solved] |
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Greetings,
when running grub-mkconfig -o /boot/grub/grub.cfg after a new kernel inclusion, I get an entry based on /etc/default/grub.
I need to create another identical entry but with different set of GRUB_CMDLINE_LINUX_DEFAULT.
any idea how can I achieve that?
Thanks,
Dagg.
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Only two things are infinite, the universe and human stupidity and I'm not sure about the former - Albert Einstein
Last edited by DaggyStyle on Fri Oct 16, 2020 10:27 pm; edited 1 time in total |
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alamahant
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Joined: 23 Mar 2019
Posts: 3879
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| Posted: Thu Oct 15, 2020 11:05 pm Post subject: |
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You can manually edit grub.cfg
| Code: |
#####ORIGINAL ENTRY
menuentry 'Gentoo GNU/Linux' --class gentoo --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-simple-99d6e8e5-00b7-4975-9fde-8ad8451703d5' {
load_video
if [ "x$grub_platform" = xefi ]; then
set gfxpayload=keep
fi
insmod gzio
insmod part_gpt
insmod ext2
set root='hd1,gpt3'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-ieee1275='ieee1275//disk@0,gpt3' --hint-bios=hd1,gpt3 --hint-efi=hd1,gpt3 --hint-baremetal=ahci1,gpt3 bdcfcb7b-5a6f-4519-a124-43436abedd40
else
search --no-floppy --fs-uuid --set=root bdcfcb7b-5a6f-4519-a124-43436abedd40
fi
echo 'Loading Linux 5.8.5-gentoo ...'
linux /vmlinuz-5.8.5-gentoo root=/dev/mapper/gen-root ro root=/dev/mapper/gen-root rootfstype=ext4 net.ifnames=0 biosdevname=0 sysrq_always_enabled=1 panic=20 audit=0 selinux=0 nvidia-drm.modeset=1 miti>
echo 'Loading initial ramdisk ...'
initrd /intel-uc.img /initramfs-5.8.5-gentoo.img
}
######NEW UPDATED ENTRY
menuentry 'Gentoo GNU/Linux WITH DIFFERENT CMDLINE ARGS' --class gentoo --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-simple-99d6e8e5-00b7-4975-9fde-8ad8451703d5' {
load_video
if [ "x$grub_platform" = xefi ]; then
set gfxpayload=keep
fi
insmod gzio
insmod part_gpt
insmod ext2
set root='hd1,gpt3'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-ieee1275='ieee1275//disk@0,gpt3' --hint-bios=hd1,gpt3 --hint-efi=hd1,gpt3 --hint-baremetal=ahci1,gpt3 bdcfcb7b-5a6f-4519-a124-43436abedd40
else
search --no-floppy --fs-uuid --set=root bdcfcb7b-5a6f-4519-a124-43436abedd40
fi
echo 'Loading Linux 5.8.5-gentoo ...'
linux /vmlinuz-5.8.5-gentoo root=/dev/mapper/gen-root ro root=/dev/mapper/gen-root rootfstype=ext4 net.ifnames=0 biosdevname=0 sysrq_always_enabled=1 panic=20 audit=0 selinux=0 nvidia-drm.modeset=1 miti>
echo 'Loading initial ramdisk ...'
initrd /intel-uc.img /initramfs-5.8.5-gentoo.img
}
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Modifying the
" linux /vmlinuz"
line to reflect your needs.
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mike155
Advocate
Joined: 17 Sep 2010
Posts: 4438
Location: Frankfurt, Germany
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| Posted: Thu Oct 15, 2020 11:53 pm Post subject: |
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Why do you run grub-mkconfig at all? It creates ugly and unreadable grub.cfg files.
A small and static grub.cfg is sufficient. See: https://forums.gentoo.org/viewtopic-p-8122378.html#8122378
Below is my grub.cfg:
| Code: | timeout=5
default=0
menu_color_normal=white/blue
menuentry 'Linux' {
set root='hd0,msdos1'
linux /vmlinuz root=/dev/nvme0n1p2 ro net.ifnames=0 init=/usr/lib/systemd/systemd
}
menuentry 'Linux Backup' {
set root='hd0,msdos1'
linux /vmlinuz-Backup root=/dev/nvme0n1p2 ro net.ifnames=0 init=/usr/lib/systemd/systemd
} |
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DaggyStyle
Watchman
Joined: 22 Mar 2006
Posts: 5910
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| Posted: Fri Oct 16, 2020 7:20 am Post subject: |
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| alamahant wrote: | You can manually edit grub.cfg
| Code: |
#####ORIGINAL ENTRY
menuentry 'Gentoo GNU/Linux' --class gentoo --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-simple-99d6e8e5-00b7-4975-9fde-8ad8451703d5' {
load_video
if [ "x$grub_platform" = xefi ]; then
set gfxpayload=keep
fi
insmod gzio
insmod part_gpt
insmod ext2
set root='hd1,gpt3'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-ieee1275='ieee1275//disk@0,gpt3' --hint-bios=hd1,gpt3 --hint-efi=hd1,gpt3 --hint-baremetal=ahci1,gpt3 bdcfcb7b-5a6f-4519-a124-43436abedd40
else
search --no-floppy --fs-uuid --set=root bdcfcb7b-5a6f-4519-a124-43436abedd40
fi
echo 'Loading Linux 5.8.5-gentoo ...'
linux /vmlinuz-5.8.5-gentoo root=/dev/mapper/gen-root ro root=/dev/mapper/gen-root rootfstype=ext4 net.ifnames=0 biosdevname=0 sysrq_always_enabled=1 panic=20 audit=0 selinux=0 nvidia-drm.modeset=1 miti>
echo 'Loading initial ramdisk ...'
initrd /intel-uc.img /initramfs-5.8.5-gentoo.img
}
######NEW UPDATED ENTRY
menuentry 'Gentoo GNU/Linux WITH DIFFERENT CMDLINE ARGS' --class gentoo --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-simple-99d6e8e5-00b7-4975-9fde-8ad8451703d5' {
load_video
if [ "x$grub_platform" = xefi ]; then
set gfxpayload=keep
fi
insmod gzio
insmod part_gpt
insmod ext2
set root='hd1,gpt3'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-ieee1275='ieee1275//disk@0,gpt3' --hint-bios=hd1,gpt3 --hint-efi=hd1,gpt3 --hint-baremetal=ahci1,gpt3 bdcfcb7b-5a6f-4519-a124-43436abedd40
else
search --no-floppy --fs-uuid --set=root bdcfcb7b-5a6f-4519-a124-43436abedd40
fi
echo 'Loading Linux 5.8.5-gentoo ...'
linux /vmlinuz-5.8.5-gentoo root=/dev/mapper/gen-root ro root=/dev/mapper/gen-root rootfstype=ext4 net.ifnames=0 biosdevname=0 sysrq_always_enabled=1 panic=20 audit=0 selinux=0 nvidia-drm.modeset=1 miti>
echo 'Loading initial ramdisk ...'
initrd /intel-uc.img /initramfs-5.8.5-gentoo.img
}
|
Modifying the
" linux /vmlinuz"
line to reflect your needs.
|
I'd rather have grub-mkconfig create it as it can handle older versions, thanks for the suggestion thought
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Only two things are infinite, the universe and human stupidity and I'm not sure about the former - Albert Einstein |
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DaggyStyle
Watchman
Joined: 22 Mar 2006
Posts: 5910
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| Posted: Fri Oct 16, 2020 7:21 am Post subject: |
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| mike155 wrote: | Why do you run grub-mkconfig at all? It creates ugly and unreadable grub.cfg files.
A small and static grub.cfg is sufficient. See: https://forums.gentoo.org/viewtopic-p-8122378.html#8122378
Below is my grub.cfg:
| Code: | timeout=5
default=0
menu_color_normal=white/blue
menuentry 'Linux' {
set root='hd0,msdos1'
linux /vmlinuz root=/dev/nvme0n1p2 ro net.ifnames=0 init=/usr/lib/systemd/systemd
}
menuentry 'Linux Backup' {
set root='hd0,msdos1'
linux /vmlinuz-Backup root=/dev/nvme0n1p2 ro net.ifnames=0 init=/usr/lib/systemd/systemd
} |
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because I want to keep older versions and don't have to maintain the file myself.
I think I have a possible solution, will update.
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Only two things are infinite, the universe and human stupidity and I'm not sure about the former - Albert Einstein |
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halcon
l33t
Joined: 15 Dec 2019
Posts: 629
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| Posted: Fri Oct 16, 2020 9:03 am Post subject: |
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Thank you! Good to know. |
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Goverp
Advocate
Joined: 07 Mar 2007
Posts: 2014
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| Posted: Fri Oct 16, 2020 9:15 am Post subject: |
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| DaggyStyle wrote: | | ... because I want to keep older versions and don't have to maintain the file myself. ... |
You might like to try my static grub.cfg file that works for current and old versions (assuming you use the /boot/vmlinuz-5.9.0-foo naming conventions and the symbolic or hard links for /boot/vmlinuz, and optionally ditto for initramfs...img files). Once configured, never needs updating, and uses the grub shell script to generate a submenu of all the old kernels.
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DaggyStyle
Watchman
Joined: 22 Mar 2006
Posts: 5910
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| Posted: Fri Oct 16, 2020 9:34 am Post subject: |
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| Goverp wrote: | | DaggyStyle wrote: | | ... because I want to keep older versions and don't have to maintain the file myself. ... |
You might like to try my static grub.cfg file that works for current and old versions (assuming you use the /boot/vmlinuz-5.9.0-foo naming conventions and the symbolic or hard links for /boot/vmlinuz, and optionally ditto for initramfs...img files). Once configured, never needs updating, and uses the grub shell script to generate a submenu of all the old kernels. |
thanks for the suggestion, however I cannot use it as afaik, links are not possible in vfat.
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Only two things are infinite, the universe and human stupidity and I'm not sure about the former - Albert Einstein |
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alamahant
Advocate
Joined: 23 Mar 2019
Posts: 3879
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| Posted: Fri Oct 16, 2020 9:51 am Post subject: |
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What you CAN do is add your modified entry in
| Code: |
/etc/grub.d/41_custom
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This way grub will auto add it every time you run grub update.
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mike155
Advocate
Joined: 17 Sep 2010
Posts: 4438
Location: Frankfurt, Germany
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| Posted: Fri Oct 16, 2020 11:35 am Post subject: |
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'make install' of the vanilla kernel installs the kernel to /boot/vmlinuz. And the old kernel is copied to /boot/vmlinuz.old.
A static grub.cfg is perfectly fine if one uses the default Linux kernel install method. There's no need to change anything in grub.cfg.
But there are tools like 'debiantools', which install hooks in /etc/kernel/install.d/. These hooks modify 'make install' so that it installs the kernel to /boot/vmlinuz-X.Y.Z. And then it's necessary to run grub-mkconfig after 'make install', because the name of kernel image changes with every new version of the kernel.
But if you think about it - it's probably much better to use the default install method (install the kernel to /boot/vmlinuz) than to have the version in the images' names and to run 'grub-mkconfig' every time a new kernel is installed. |
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DaggyStyle
Watchman
Joined: 22 Mar 2006
Posts: 5910
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| Posted: Fri Oct 16, 2020 12:13 pm Post subject: |
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| alamahant wrote: | What you CAN do is add your modified entry in
| Code: |
/etc/grub.d/41_custom
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This way grub will auto add it every time you run grub update.
|
the solution I'm working on uses 40_custom
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Only two things are infinite, the universe and human stupidity and I'm not sure about the former - Albert Einstein |
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DaggyStyle
Watchman
Joined: 22 Mar 2006
Posts: 5910
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| Posted: Fri Oct 16, 2020 12:40 pm Post subject: |
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| mike155 wrote: | 'make install' of the vanilla kernel installs the kernel to /boot/vmlinuz. And the old kernel is copied to /boot/vmlinuz.old.
A static grub.cfg is perfectly fine if one uses the default Linux kernel install method. There's no need to change anything in grub.cfg.
But there are tools like 'debiantools', which install hooks in /etc/kernel/install.d/. These hooks modify 'make install' so that it installs the kernel to /boot/vmlinuz-X.Y.Z. And then it's necessary to run grub-mkconfig after 'make install', because the name of kernel image changes with every new version of the kernel.
But if you think about it - it's probably much better to use the default install method (install the kernel to /boot/vmlinuz) than to have the version in the images' names and to run 'grub-mkconfig' every time a new kernel is installed. |
I'm not using make install, I got used to copy bzImage and rename it to something more meaningful which for example holds the kernel version.
looks like my script read, I just hope it works
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DaggyStyle
Watchman
Joined: 22 Mar 2006
Posts: 5910
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| Posted: Fri Oct 16, 2020 10:27 pm Post subject: |
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wrote a script that grub-mkconfig to temp file, than takes the relevant entry and place it in 40_custom.
then it runs grub-mkconfig into the correct file, works like a charm.
thanks for the suggestions.
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