On Sun, Jul 9, 2023 at 2:49 PM Andrei Borzenkov <[email protected]> wrote: > > On 09.07.2023 09:33, Hongyi Zhao wrote: > > On Sun, Jul 9, 2023 at 1:13 PM Andrei Borzenkov <[email protected]> wrote: > >> > >> On 09.07.2023 03:21, Hongyi Zhao wrote: > >>> On Sat, Jul 8, 2023 at 9:53 PM Andrei Borzenkov <[email protected]> > >>> wrote: > >>>> > >>>> On 08.07.2023 14:58, Hongyi Zhao wrote: > >>>>> Hi here, > >>>>> > >>>>> Are there some convenient methods to debug grub scripts without > >>>>> rebooting into grub shell? > >>>>> > >>>> > >>>> You may try grub-emu which emulates grub. > >>> > >>> I tried, but it seems that grub-emu doesn't meet my requirement as > >>> described below. > >>> > >>> I want to debug the grubx64.efi created by the following command: > >>> > >> > >> If you want to debug grubx64.efi, then you of course need to load it > >> either on real hardware or in VM. But you can debug scripts used by > >> grubx64.efi using grub-emu by setting up suitable simulated environment. > >> There are clear limitations (scripts cannot load and start any kernel). > > > > Then, how to access the real hard disk devices and partitions? I can > > only see the following devices via grub-emu: > > > > 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? > > grub> ls > > (proc) (host) > > > > Best, > > Zhao > > > >>> $ grub-mkstandalone -O x86_64-efi -o grubx64.efi --modules='lvm fat > >>> ntfs part_msdos part_gpt ext2 btrfs probe regexp search configfile' > >>> boot/grub/grub.cfg=./grub.cfg > >>> > >>> The content of the ./grub.cfg is as follows: > >>> > >>> $ egrep -v '^[ ]*(#|$)' grub.cfg > >>> regexp -s __cmdpath_efi '^\(([^,]+)' "$cmdpath" > >>> export __cmdpath_efi > >>> for file in ($__cmdpath_efi,*)/multibootusb.git/grub.cfg; do > >>> if regexp -s __root '^(\([^*]+\))' "$file"; then > >>> set __prefix=$__root/multibootusb.git > >>> export __root > >>> export __prefix > >>> configfile $__prefix/grub.cfg > >>> break > >>> fi > >>> done > >>> > >>> The files' layout is as follows: > >>> > >>> $ tree . > >>> . > >>> ├── grub.cfg > >>> ├── grub-mkstandalone.sh > >>> ├── grubx64.efi > >>> └── iso > >>> ├── deepin-desktop-community-23-Beta-amd64.iso > >>> ├── rescatux-0.74.iso > >>> ├── supergrub2-2.06s1-beta2-multiarch-CD.iso > >>> ├── systemrescue-10.01-amd64.iso > >>> ├── ubuntu-23.04-desktop-amd64.iso > >>> └── ubuntukylin-23.04-desktop-amd64.iso > >>> > >>> 1 directory, 9 files > >>> > >>> Regards, > >>> Zhao
