I want to add a custom menu to grub2 like this (as /etc/grub.d/40_custom
):
#!/bin/sh
exec tail -n +3 $0
# This file provides an easy way to add custom menu entries. Simply type the
# menu entries you want to add after this comment. Be careful not to change
# the 'exec tail' line above.
menuentry "Arch Linux" {
....some data here.....
}
and what I need is the "....some data here....."
Some difficulties:
When booting the drive order changes from BIOS e.g. sometimes the
disk with the partition is/dev/sda
and sometimes it is/dev/sdg
. so I use the UUIDs for the partition. UPDATE: last time is was/dev/sdc
!The Linux system uses a separate boot partition i.e. partition 1 is the
/boot
partition, partition 2 is the/root
partition and extended partition 4 is the/home
partition
Here blkid output from when Linux thought the disk was /dev/sdg...
/dev/sdg1: LABEL="arch_boot" UUID="34a39f15-f1a8-46a3-88e7-00c370c3c6a2" TYPE="ext2"
/dev/sdg2: LABEL="arch_root" UUID="c670b0cf-a644-48d6-903d-dc3e49395a04" TYPE="ext2"
/dev/sdg3: UUID="b36c4dc0-f5d7-488e-80fb-4c2e14313de5" TYPE="swap"
/dev/sdg5: LABEL="arch_home" UUID="327900a5-e8f7-4dc4-be52-2f0dd97e3164" TYPE="ext4"
/dev/sdg6: LABEL="arch_adjunct" UUID="f65f0ae6-9af2-4767-b223-a199ce96c71a" TYPE="reiserfs"
Here's contents of the Linux System (which had grub legacy until boot-repair overrode the MBR):
⋯@64bitWS:/media$ ls arch_boot
grub initramfs-linux-fallback.img initramfs-linux.img lost+found vmlinuz-linux
⋯@64bitWS:/media$ ls arch_boot/grub
e2fs_stage1_5 iso9660_stage1_5 minix_stage1_5 stage2 vstafs_stage1_5
fat_stage1_5 jfs_stage1_5 reiserfs_stage1_5 stage2_eltorito xfs_stage1_5
ffs_stage1_5 menu.lst stage1 ufs2_stage1_5
⋯@64bitWS:/media$ ls arch_root
aur boot etc lib lost+found mnt proc run srv tmp var
bin dev home lib64 media opt root sbin sys usr
boot-info at http://paste.ubuntu.com/1099113/ and at http://paste.ubuntu.com/1100049/ for each of the cases of different boot orders.
I know it can work because it has worked before...
UPDATE:
I ran os-prober from 10.04 (1.38/lucid) and it worked, it found all linux systems unlike 12.04 os-prober (1.51). So I ran boot-repair (http://paste.ubuntu.com/1101977/) again and it produced the Arch Linux grub2 menu entry. It loooked like this (from /boot/grub/grub.conf
):
menuentry 'Arch Linux' {
insmod gzio
insmod part_msdos
insmod ext2
set root='(hd6,msdos1)'
search --no-floppy --fs-uuid --set=root 34a39f15-f1a8-46a3-88e7-00c370c3c6a2
linux /boot/vmlinuz-linux root=UUID=670b0cf-a644-48d6-903d-dc3e49395a04
initrd /boot/initramfs-linux.img
}
Identical to Cumulus007 proposed answer.
Unfortunately this "new" grub.cfg wouldn't boot Arch Linux so no answer yet...
Last UPDATE: It seems that 10.04's grub3 (1.98) cannot use UUIDs for booting, and since my hardware's BIOS mixes up hard-drive order from boot to boot, actually achieving a boot is a craps shoot... <¬(