Re: Debug grub scripts without rebooting into grub shell.

[Andrei Borzenkov]

On 09.07.2023 12:26, Hongyi Zhao wrote:
...
> > > > You create device.map and give names hd0, hd1, ... to your devices.
> > >
> > > See below:
> > >
> > > werner@X10DAi:~$ sudo grub-mkdevicemap -n
> > > werner@X10DAi:~$ cat /boot/grub/device.map
> > > (hd0)    /dev/disk/by-id/nvme-SAMSUNG_MZVL22T0HBLB-00B00_S677NF0R503706
> > > (hd1)    /dev/disk/by-id/ata-WDC_WDS100T2B0A-00SM50_191533467906
> > >
> > > Now, I see the following devices in grub-emu:
> > >
> > > grub> ls
> > > (proc) (hd0) (hd1) (host)
> > >
> > > But how to access the corresponding partitions on these devices?
> >
> > Did you try to load partition driver?
>
> I tried as follows, but still failed to see the partitions:
>
> grub> insmod lvm fat ntfs part_msdos part_gpt ext2 btrfs
> grub> ls
> (proc) (hd0) (hd1) (host)
>
> Any more hints?

Are you running grub-emu as root or your normal user?