Re: [gentoo-user] Re: Dual Booting - selection from command line

[Michael <confabulate@kintzios.com>]

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On Wednesday, 17 January 2024 15:40:50 GMT thelma@sys-concept.com wrote:
> On 1/10/24 15:14, Mark Knecht wrote:
> > On Wed, Jan 10, 2024 at 2:38 PM <thelma@sys-concept.com 
<mailto:thelma@sys-concept.com>> wrote:
> >  > On 1/9/24 19:22, Nikos Chantziaras wrote:
> >  > > On 10/01/2024 02:18, thelma@sys-concept.com <mailto:thelma@sys-
concept.com> wrote:
> >  > >> I have a box that is two HD's and both are bootable; using "refind"
> >  > >> instead of grub. So the selection I choose at boot which drive to
> >  > >> boot will be the default (during reboot, from command line) until I
> >  > >> select the second drive.
> >  > >> 
> >  > >> The box will be installed in a remote location, so I have no option
> >  > >> to select which drive to boot from (unless I'm in front of the
> >  > >> box). Is it possible to select which drive I want to "boot" from
> >  > >> the command line (reboot #2 etc)?>  > > 
> >  > > Maybe this helps:
> >  > > https://gist.github.com/Darkhogg/82a651f40f835196df3b1bd1362f5b8c
> >  > > <https://gist.github.com/Darkhogg/82a651f40f835196df3b1bd1362f5b8c>>  
> 
> >  > Thank you for the link.
> > 
> > I have no experience with refind but for my UEFI systems I accomplish this
> > using efibootmgr and a simple batch file. The machine always boots Linux
> > by default but from within Linux I can tell it to reboot into Windows
> > 
> > mark@science2:~$ sudo efibootmgr
> > BootCurrent: 0003
> > Timeout: 1 seconds
> > BootOrder: 0003,0000
> > Boot0000* Windows Boot Manager
> > Boot0003* ubuntu
> > 
> > 
> > mark@science2:~$ cat bin/RebootWindows
> > sudo efibootmgr -n 0000
> > reboot
> > mark@science2:~$
> 
> Thank you, yes that work perfectly
> 
> "efibootmgr -n "  is one time entry for one reboot; to set it permanently
> one should use: "efibootmgr -o + arrange entries"
> 
> Does anybody know how to rename the boot entries, in my case I have:
> 
> efibootmgr
> BootCurrent: 0004
> Timeout: 1 seconds
> BootOrder: 0000,0004,0002
> Boot0000* rEFInd Boot
> Manager	HD(1,GPT,87a5c5b6-c0a8-024c-b1c0-622907add992,0x800,0x200000)/File(
> \EFI\REFIND\REFIND_X64.EFI) Boot0002* UEFI
> OS	HD(1,GPT,87a5c5b6-c0a8-024c-b1c0-622907add992,0x800,0x200000)/
File(\EFI\
> BOOT\BOOTX64.EFI)0000424f Boot0004* rEFInd Boot
> Manager	HD(1,GPT,9d2481cf-8c35-4d9d-88ee-1d0d6e06cc68,0x800,0x1dc800)/File(
> \EFI\refind\refind_x64.efi)
> 
> This is cryptic,
> 0000 - is sda disk
> 0004 - nvme disk
> 
> How to rename them to SDA  and NVME respectively

You can try using the '--label' option, but I understand this only works when 
you create a new menu in the firmware, e.g.:

efibootmgr --create --disk /dev/sda --part X --label "SDA" --loader 
"\EFI\REFIND\REFIND_X64.EFI"

I don't know if running this would create a duplicate, but you can delete the 
entry first and then recreate it as above.

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