On some older Debian-based distros (in particular, this is true for Debian 8) GRUB config file doesn't reside on EFI partition, but rather at /boot/grub/grub.cfg even if UEFI firmware is being used. As a result, in the UEFI case we get "error: no bootloader detected". Let's just append this path to the end of the corresponding list as a workaround when dealing with UEFI guests. Signed-off-by: Andrey Drobyshev <andrey.drobyshev(a)virtuozzo.com&gt; --- mldrivers/linux_bootloaders.ml | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/mldrivers/linux_bootloaders.ml b/mldrivers/linux_bootloaders.ml index 6f8857e..91c5ab9 100644 --- a/mldrivers/linux_bootloaders.ml +++ b/mldrivers/linux_bootloaders.ml @@ -375,6 +375,18 @@ let detect_bootloader (g : G.guestfs) root i_firmware = with G.Error msg -> error (f_"could not find bootloader mount point (%s): %s") mp msg in + (* + * Workaround for older UEFI-based Debian which may not have + * /boot/efi/EFI/debian/grub.cfg. + *) + let paths = + if g#exists "/boot/grub/grub.cfg" then + match i_firmware with + | Firmware.I_BIOS -> paths + | I_UEFI _ -> paths @ ["/boot/grub/grub.cfg"] + else paths + in + (* We can determine if the bootloader config file is grub 1 or * grub 2 just by looking at the filename. *)

On Tue, Oct 31, 2023 at 09:45:15PM +0100, Laszlo Ersek wrote: > On 10/31/23 14:17, Andrey Drobyshev wrote: >> On some older Debian-based distros (in particular, this is true for >> Debian 8) GRUB config file doesn't reside on EFI partition, but rather >> at /boot/grub/grub.cfg even if UEFI firmware is being used. As a >> result, in the UEFI case we get "error: no bootloader detected". Let's >> just append this path to the end of the corresponding list as a workaround >> when dealing with UEFI guests. >> >> Signed-off-by: Andrey Drobyshev <andrey.drobyshev(a)virtuozzo.com&gt; >> --- >> mldrivers/linux_bootloaders.ml | 12 ++++++++++++ >> 1 file changed, 12 insertions(+) >> >> diff --git a/mldrivers/linux_bootloaders.ml b/mldrivers/linux_bootloaders.ml >> index 6f8857e..91c5ab9 100644 >> --- a/mldrivers/linux_bootloaders.ml >> +++ b/mldrivers/linux_bootloaders.ml >> @@ -375,6 +375,18 @@ let detect_bootloader (g : G.guestfs) root i_firmware = >> with G.Error msg -> >> error (f_"could not find bootloader mount point (%s): %s") mp msg in >> >> + (* >> + * Workaround for older UEFI-based Debian which may not have >> + * /boot/efi/EFI/debian/grub.cfg. >> + *) >> + let paths = >> + if g#exists "/boot/grub/grub.cfg" then >> + match i_firmware with >> + | Firmware.I_BIOS -> paths >> + | I_UEFI _ -> paths @ ["/boot/grub/grub.cfg"] >> + else paths >> + in >> + >> (* We can determine if the bootloader config file is grub 1 or >> * grub 2 just by looking at the filename. >> *) > > I'm not sure if the g#exists check is helpful; after all, in the "loop" > function, we have a stricter g#is_file check. IOW, if the special path > does not exist (or does not resolve to a regular file, after following > symlinks), then "loop" will drop the candidate anyway. And if g#exists > returns true, then "loop" may still drop the candidate (or may keep it). > So IMO, just the inner "match" would suffice. > > Anyway, I don't want to draw this out forever, so with the g#exists > check kept, or removed: > > Reviewed-by: Laszlo Ersek <lersek(a)redhat.com&gt; Andrey, if we push this patch (to libguestfs-common) then we no longer need the other patch as the i_firmware parameter is still required, is that correct? I can push this once confirmed.

BTW I apologise for the mailing list problems. We are in the process of moving the server, and the mailing address is now &#39;guestfs(a)lists.libguestfs.org&#39; with archives at https://lists.libguestfs.org . I haven't made the announcement yet.

On Thu, Nov 02, 2023 at 12:37:19PM +0200, Andrey Drobyshev wrote: > On 11/2/23 12:23, Richard W.M. Jones wrote: >> On Tue, Oct 31, 2023 at 09:45:15PM +0100, Laszlo Ersek wrote: >>> On 10/31/23 14:17, Andrey Drobyshev wrote: >>>> On some older Debian-based distros (in particular, this is true for >>>> Debian 8) GRUB config file doesn't reside on EFI partition, but rather >>>> at /boot/grub/grub.cfg even if UEFI firmware is being used. As a >>>> result, in the UEFI case we get "error: no bootloader detected". Let's >>>> just append this path to the end of the corresponding list as a workaround >>>> when dealing with UEFI guests. >>>> >>>> Signed-off-by: Andrey Drobyshev <andrey.drobyshev(a)virtuozzo.com&gt; >>>> --- >>>> mldrivers/linux_bootloaders.ml | 12 ++++++++++++ >>>> 1 file changed, 12 insertions(+) >>>> >>>> diff --git a/mldrivers/linux_bootloaders.ml b/mldrivers/linux_bootloaders.ml >>>> index 6f8857e..91c5ab9 100644 >>>> --- a/mldrivers/linux_bootloaders.ml >>>> +++ b/mldrivers/linux_bootloaders.ml >>>> @@ -375,6 +375,18 @@ let detect_bootloader (g : G.guestfs) root i_firmware = >>>> with G.Error msg -> >>>> error (f_"could not find bootloader mount point (%s): %s") mp msg in >>>> >>>> + (* >>>> + * Workaround for older UEFI-based Debian which may not have >>>> + * /boot/efi/EFI/debian/grub.cfg. >>>> + *) >>>> + let paths = >>>> + if g#exists "/boot/grub/grub.cfg" then >>>> + match i_firmware with >>>> + | Firmware.I_BIOS -> paths >>>> + | I_UEFI _ -> paths @ ["/boot/grub/grub.cfg"] >>>> + else paths >>>> + in >>>> + >>>> (* We can determine if the bootloader config file is grub 1 or >>>> * grub 2 just by looking at the filename. >>>> *) >>> >>> I'm not sure if the g#exists check is helpful; after all, in the "loop" >>> function, we have a stricter g#is_file check. IOW, if the special path >>> does not exist (or does not resolve to a regular file, after following >>> symlinks), then "loop" will drop the candidate anyway. And if g#exists >>> returns true, then "loop" may still drop the candidate (or may keep it). >>> So IMO, just the inner "match" would suffice. >>> >>> Anyway, I don't want to draw this out forever, so with the g#exists >>> check kept, or removed: >>> >>> Reviewed-by: Laszlo Ersek <lersek(a)redhat.com&gt; >> >> Andrey, if we push this patch (to libguestfs-common) then we no longer >> need the other patch as the i_firmware parameter is still required, is >> that correct? I can push this once confirmed. >> > > Hello Richard, > > Yes, you're right, this single patch is sufficient as it doesn't change > the function signature. Feel free to omit the g#esists part as Laszlo > suggested. That's upstream in e711121607869363200aa80218719dcb25fcd98f (as posted, with g#exists). I'll update guestfs-tools & virt-v2v common submodules in a moment.

Rich. >> BTW I apologise for the mailing list problems. We are in the process >> of moving the server, and the mailing address is now >> &#39;guestfs(a)lists.libguestfs.org&#39; with archives at >> https://lists.libguestfs.org . I haven't made the announcement yet. >> > > Thanks for pointing out, automated response with the announcement did > help here. > > Andrey