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Vrenn
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Joined: 15 Dec 2004
Posts: 189

PostPosted: Sat Oct 26, 2013 1:41 pm    Post subject: grub2 successfull but save? Reply with quote

Today I followed the grub migration guide. But to be honest I don't get happy with grub2-mkconfig.
It doesn't find my kernel (renaming to kernel-version would break my kernel-upgrade-script, needing detection of old versions too), it needs help with windows, it just makes more work.

So I just tried to migrate syntax.
Here is the old grub.conf
Code:
default 0
timeout 10
#color red/green blue/white
splashimage=(hd0,4)/boot/grub/personal-splash.xpm.gz
foreground 00f0f2
background 000000

title=Gentoo GNU/Linux
root (hd0,4)
kernel (hd0,4)/boot/bzImage root=/dev/sda7

#Windows
title=Wintendo
root (hd0,1)
chainloader (hd0,1)+1

#grub2 test entry
title GRUB2 Chainload
root (hd0,4)
kernel /boot/grub/i386-pc/core.img
boot
and here the new grub.cfg
Code:
timeout=10

menuentry 'Gentoo GNU/Linux' {
        root=hd0,5
        linux /boot/bzImage root=/dev/sda7
}

menuentry 'Wintendo' {
        insmod part_msdos
        insmod chain
        insmod ntfs
        chainloader (hd0,2)+1
}
Are there any arguments against using a custom grub.cfg?
Arch-Linux gives out a warning manually editing grub.cfg.
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audiodef
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Joined: 06 Jul 2005
Posts: 5190

PostPosted: Sat Oct 26, 2013 3:13 pm    Post subject: Re: grub2 successfull but save? Reply with quote

Vrenn wrote:
Today I followed the grub migration guide. But to be honest I don't get happy with grub2-mkconfig.
It doesn't find my kernel (renaming to kernel-version would break my kernel-upgrade-script


As far as I know, this isn't negotiable for grub2-mkconfig. You need your kernel file name to follow a certain format. But you could either find instructions for manually configuring grub2, or create symlinks to your kernels with the correct filename format (never tried symlinking a kernel before, though, so I don't know if this would work).
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Vrenn
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PostPosted: Sat Oct 26, 2013 3:55 pm    Post subject: Reply with quote

Symlink or move. Anyway I would have to remove old kernel-versions manually from /boot and this would be quite annoying over time.
I would like to know which advantages grub2-mkconfig brings. I mean it's grub.cfg is huge and I don't understand it. The last one I hate most.
If it doesn't do more than just start linux, windows and perhaps memtest I'll go with my own file and add some bling.
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Vrenn
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PostPosted: Sat Oct 26, 2013 6:26 pm    Post subject: Reply with quote

I gave the grub2-architekture another try using 40_custom in /etc/grub.d.

I found an old guide which helped me to understand the whole system.
but the starfield-theme is not the right one for my system.
Text to small for 1920x1080.
The menu-order is not my taste.
I need to script the theme new.
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ulenrich
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PostPosted: Sun Oct 27, 2013 12:10 am    Post subject: Reply with quote

I just delete the /etc/grub.d/20_osprober to get no kernel automatically. Then I create
/etc/grub.d/40_custom
Code:
menuentry "gentoo.new" {
load_video
insmod gzio
insmod part_gpt
insmod ext2
set root='(hd0,gpt7)'
linux /boot/kernel.new root=/dev/sda7
initrd /boot/initrd.new
}
Booting with grub it is possible to use symlinked new kernels by your kernel make script. Thus never need to update ...
Ps: remember genkernels initrd wants real_root!
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Last edited by ulenrich on Sun Oct 27, 2013 4:07 pm; edited 1 time in total
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mv
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PostPosted: Sun Oct 27, 2013 8:29 am    Post subject: Re: grub2 successfull but save? Reply with quote

Vrenn wrote:
Are there any arguments against using a custom grub.cfg?

No. I recommend this always.
Quote:
Arch-Linux gives out a warning manually editing grub.cfg.

If you blindly run grub2-mkconfig after you edited the file, you might loose it, of course. But in Gentoo nothing runs grub2-mkconfig automatically. This might be different in Arch-Linux. It won't hurt to keep a backup anyway...
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Vrenn
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PostPosted: Sun Oct 27, 2013 3:33 pm    Post subject: Reply with quote

Backup is important.
I still have not decided what to so, at now I have a working mkconfig and a manual .cfg.
Lets see how I can customize grub more, with the scripts or directly.
Lets see what systemd wants.
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mv
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PostPosted: Sun Oct 27, 2013 4:22 pm    Post subject: Reply with quote

The only relation of systemd with grub or grub2 is that you might want to select the init-system conveniently. This is much simpler if you edit /boot/grub/grub.cfg directly.
For those interested, here is a grub file to be sourced from grub.cfg which lets you select init-system and resolution; it is followed by an example grub.cfg which uses it.
Since variables are used, this can hardly be done with an autogenerated grub.cfg.
/boot/grub/grub-common.conf wrote:
if [ -s "${prefix}/grubenv" ]; then
load_env
fi
set default="0"
if [ "${prev_saved_entry}" ]; then
set saved_entry="${prev_saved_entry}"
save_env saved_entry
set prev_saved_entry=
save_env prev_saved_entry
set boot_once=true
fi

function savedefault {
if [ -z "${boot_once}" ]; then
saved_entry="${chosen}"
save_env saved_entry
fi
}

set timeout=5

insmod part_msdos

function graphmode {
insmod vga
insmod vbe
loadfont unicode
# insmod all_video
# insmod efi_gop
# insmod efi_uga
# insmod ieee1275_fb
# insmod video_bochs
# insmod video_cirrus
insmod gfxterm
terminal_output gfxterm
}

function set_defaults {
set color_normal='light-green/black'
set color_highlight='yellow/brown'
set gfxmode='1024x768x32'
}

function set_systemd {
set init='/usr/lib/systemd/systemd'
}

function set_openrc {
set init='/sbin/init'
}

function set_bash {
set init='/bin/bash'
}

function set_zsh {
set init='/bin/zsh'
}

functions set_800 {
set gfxpayload='800x600x32'
set vga='0x314'
set video='VGA:800x600@75'
}

function set_1024 {
set gfxpayload='1024x768x32'
set vga='0x317'
set video='VGA:1024x768@75'
}

function set_1152 {
set gfxpayload='1024x768x32'
set vga='0x317'
set video='VGA:1152x864@75'
}

function set_1280 {
set gfxpayload='1280x1024x32'
set vga='0x31A'
set video='VGA:1280x1024@75'
}

function set_1400 {
set gfxpayload='1280x1024x32'
set vga='0x31A'
set video='VGA:1400x1050@75'
}

function set_1600 {
set gfxpayload='1600x1200x16'
set vga='0x346'
set video='VGA:1600x1200@75'
}

function echo_resolution {
echo "gfxpayload: ${gfxpayload}"
echo "vga : ${vga}"
echo "video : ${video}"
}

function echo_current {
echo_init
echo_resolution
}

function echo_init {
echo "init : ${init}"
}

function echo_boot {
echo_current
echo "root : ${root}"
}

function pause {
echo -n 'Press Esc to return. '
sleep -i -v 60
}

function show_init {
echo_init
pause
}

function show_resolution {
echo_resolution
pause
}

function show_current {
echo_current
pause
}

function show_boot {
echo_boot
pause
}

function show_vbe {
set pagersave="${pager}"
set pager=1
vbeinfo
pause
set pager="${pagersave}"
}

function select_systemd {
echo 'selecting systemd:'
set_systemd
pause
}

function select_openrc {
echo 'selecting openrc:'
set_openrc
pause
}

function select_bash {
echo 'selecting bash:'
set_bash
pause
}

function select_zsh {
echo 'selecting zsh:'
set_zsh
pause
}

function enter_init {
echo 'Examples for init:'
echo
echo '/sbin/init'
echo '/usr/lib/systemd/systemd'
echo '/bin/bash'
echo '/bin/zsh'
echo
echo -n "init (default init): "
read readvar
if [ -n "${readvar}" ]; then
set init="${readvar}"
fi
echo
echo
echo_init
pause
}

function select_800 {
set_800
show_resolution
}

function select_1024 {
set_1024
show_resolution
}

function select_1152 {
set_1152
show_resolution
}

function select_1280 {
set_1280
show_resolution
}

function select_1400 {
set_1400
show_resolution
}

function select_1600 {
set_1600
show_resolution
}

function enter_resolution {
echo 'Examples for gfxpayload:'
echo
echo '1280x1024x32'
echo '1024x768'
echo 'keep'
echo
echo 'Examples for vga (VESA modes):'
echo
echo ' | 640x480 800x600 1024x768 1280x1024 1600x1200'
echo '----+---------------------------------------------------'
echo ' 8 | 0x301/769 0x303/771 0x305/773 0x307/775'
echo ' 16 | 0x310/784 0x313/787 0x316/790 0x319/793 0x346'
echo '*32*| 0x311/785 0x314/788 0x317/791 0x31A/794'
echo ' 64 | 0x312/786 0x315/789 0x318/792 0x31B/795'
echo
echo -n "gfxpayload (default ${gfxpayload}): "
read readvar
if [ -n "${readvar}" ]; then
set gfxpayload="${readvar}"
fi
echo
echo -n "vga (default ${vga}): "
read readvar
if [ -n "${readvar}" ]; then
set vga="${readvar}"
fi
echo
echo -n "video (default ${video}): "
read readvar
if [ -n "${readvar}" ]; then
set video="${readvar}"
fi
echo
echo
show_resolution
}

function set_vars {
set_defaults
set_systemd
set_1400
# The following restricts all except --unrestricted to require password above:
set superusers='root'
}

function menu_vars {
menuentry '0 - Resolution 1024 768 (beamer)' --hotkey 0 --unrestricted {
select_1024
}

menuentry '8 - Resolution 800 600' --hotkey 8 --unrestricted {
select_800
}

menuentry '2 - Resolution 1280 1024' --hotkey 2 --unrestricted {
select_1280
}

menuentry '1 - Resolution 1152 864 (small non-LED)' --hotkey 1 --unrestricted {
select_1152
}

menuentry '4 - Resolution 1400 1050 (wide screen)' --hotkey 4 --unrestricted {
select_1400
}

menuentry '6 - Resolution 1600 1200' --hotkey 6 --unrestricted {
select_1600
}

menuentry 'S - Select systemd' --hotkey s --unrestricted {
select_systemd
}

menuentry 'O - Select openrc' --hotkey o --unrestricted {
select_openrc
}

menuentry 'B - Select bash' --hotkey b --users '' {
select_bash
}

menuentry 'Z - Select zsh' --hotkey z --users '' {
select_zsh
}

menuentry 'R - Enter resolution' --hotkey r --unrestricted {
enter_resolution
}

menuentry 'I - Enter init' --hotkey i --users '' {
enter_init
}

menuentry 'P - Print current settings' --hotkey p --unrestricted --class gentoo --class gnu-linux --class gnu --class os {
show_current
}
# End menu_vars
}

function menu_devices {
submenu 'D - >Chainload Devices<' --hotkey d --users '' --class os {
set_vars

menuentry '0 - Harddisk 0' --hotkey 0 --unrestricted --class os {
echo 'Harddisk 0'
set root='hd0'
chainloader +1
}

menuentry '1 - Harddisk 1' --hotkey 1 --unrestricted --class os {
echo 'Harddisk 1'
set root='hd1'
chainloader +1
}

menuentry 'F - Floppy' --hotkey f --unrestricted --class os {
echo 'Floppy'
set root='fd0'
chainloader +1
}

menuentry 'D - CD/DVD 0' --hotkey d --unrestricted --class os {
echo 'CD/DVD 0'
set root='cd0'
chainloader +1
}

menuentry 'W - CD/DVD 1' --hotkey w --unrestricted --class os {
echo 'CD/DVD 1'
set root='cd1'
chainloader +1
}
# End submenu 'Chainload Devices'
}
# End menu_devices
}

function menu_info {
menuentry 'I - VBE info' --hotkey i --unrestricted {
show_vbe
}

menuentry 'G - Install grub2 info' --hotkey g --unrestricted {
echo 'grub2-install /dev/sda'
pause
}
# End menu_info
}

Usage is, for instance, as follows:
/boot/grub/grub.cfg wrote:
source "${prefix}/grub-common.cfg"

function set_vars {
set_defaults
set_systemd
set_1400
# set superusers='root'
}

set_vars
# graphmode

menuentry 'G - Gentoo 64 bitt' --hotkey g --unrestricted --class gentoo --class gnu-linux --class gnu --class os {
echo '64bit'
insmod gzio
insmod ext2
set root='hd0,msdos1' # modify appropriately
search --no-floppy --fs-uuid --set=root --hint-bios=${root} [insert your 64-bit partition UUID here]
echo_boot
linux /boot/bzImage root=/dev/modify_me init=$init vga=$vga video=$video
}

menuentry '3 - 32bit' --hotkey 3 --unrestricted --class gentoo --class gnu-linux --class gnu --class os {
echo '32bit'
insmod gzio
insmod ext2
set root='hd0,msdos1' # modify appropriately
search --no-floppy --fs-uuid --set=root --hint-bios=${root} [insert you 32-bit partition UUID here]
echo_boot
linux16 /boot/bzImage root=/dev/modify_me init=$init vga=$vga video=$video
}

submenu 'A - >First Aid<' --hotkey a --unrestricted --class gentoo --class gnu-linux --class gnu --class os {
set_vars

menuentry 'P - 64bit Previous' --hotkey p --unrestricted --class gentoo --class gnu-linux --class gnu --class os {
echo '64bit Previous'
insmod gzio
insmod ext2
set root='hd0,msdos1' # modify appropriately
search --no-floppy --fs-uuid --set=root --hint-bios=${root} [insert your 64-bit partition UUID here]
echo_boot
linux /boot/bzImage.previous root=/dev/modify_me init=$init vga=$vga
}

menuentry '3 - 32bit Previous' --hotkey 3 --unrestricted --class gentoo --class gnu-linux --class gnu --class os {
echo '32bit Previous'
insmod gzio
insmod ext2
set root='hd0,msdos1' # modify appropriately
search --no-floppy --fs-uuid --set=root --hint-bios=${root} [insert your 32-bit partition UUID here]
echo_boot
linux16 /boot/bzImage.previous root=/dev/modify_me init=$init vga=$vga video=$video
}

menu_vars
# End submenu 'First Aid'
}

submenu 'T - >Toolbox<' --hotkey t --unrestricted {
set_vars

menuentry 'M - 64bit Memtest86+' --hotkey m --unrestricted --class gentoo --class os {
echo '64bit Memtest86+'
insmod ext2
set root='hd0,msdos1' # modify appropriately
search --no-floppy --fs-uuid --set=root --hint-bios=${root} [insert your 32-bit partition UUID here]
echo $root
linux16 /boot/memtest86plus/memtest
}

menuentry '3 - 32bit Memtest86+' --hotkey 3 --unrestricted --class gentoo --class os {
echo '32bit Memtest86+'
insmod ext2
set root='hd0,msdos1' # modify appropriately
search --no-floppy --fs-uuid --set=root --hint-bios=${root} [insert your 64-bit partition UUID here]
echo $root
linux16 /boot/memtest86plus/memtest
}

menu_info
# End submenu 'Toolbox'
}

menu_vars
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