[pve-devel] [PATCH installer] install: install correct grub metapackage for the current boot-mode

[Stoiko Ivanov]

just realized while talking with Friedrich off-list - if this gets applied
it probably would make sense to include it in the pve7to8 (same for pbs
and pmg) checks (and also in the upgrade guides)
(mostly meant as a note to myself) 

On Thu, 28 Sep 2023 16:05:33 +0200
Stoiko Ivanov <s.ivanov at proxmox.com> wrote:

> grub packages in debian split between:
> * meta-packages, which handles (among other things) the reinstalling
>   grub to the actual device/ESP in case of a version upgrade (grub-pc,
>   grub-efi-amd64)
> * bin-packages, which contain the actual boot-loaders
> The bin-packages can coexist on a system, but the meta-package
> conflict with each other (didn't check why, but I don't see a hard
> conflict on a quick glance)
> 
> Currently our ISO installs grub-pc unconditionally (and both bin
> packages, since we install the legacy bootloader also on uefi-booted
> systems). This results in uefi-systems not getting a new grub
> installed automatically upon upgrade.
> 
> Reported in our community-forum from users who upgraded to PVE 8.0,
> and still run into an issue fixed in grub for bookworm:
> https://forum.proxmox.com/threads/.123512/
> 
> Reproduced and analyzed by Friedrich.
> 
> This patch changes the installer, to install the meta-package fitting
> for the boot-mode.
> 
> We do not set the debconf variable install_devices, because in my
> tests a plain debian installed in uefi mode has this set, and a
> `grep -ri install_devices /var/lib/dpkg/info` yields only results with
> grub-pc.
> 
> Reported-by: Friedrich Weber <f.weber at proxmox.com>
> Signed-off-by: Stoiko Ivanov <s.ivanov at proxmox.com>
> ---
> quickly tested by building an ISO (with the necessary modifications to
> ship both packages as .deb) and installing in legacy mode and uefi mode
> once.
>  Proxmox/Install.pm | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/Proxmox/Install.pm b/Proxmox/Install.pm
> index 1117fc4..d775ac0 100644
> --- a/Proxmox/Install.pm
> +++ b/Proxmox/Install.pm
> @@ -1057,6 +1057,12 @@ _EOD
>  	    chomp;
>  	    my $path = $_;
>  	    my ($deb) = $path =~ m/${proxmox_pkgdir}\/(.*\.deb)/;
> +
> +	    # the grub-pc/grub-efi-amd64 packages (w/o -bin) are the ones actually updating grub
> +	    # upon upgrade - and conflict with each other - install the fitting one only
> +	    next if ($deb =~ /grub-pc_/ && $run_env->{boot_type} ne 'bios');
> +	    next if ($deb =~ /grub-efi-amd64_/ && $run_env->{boot_type} ne 'efi');
> +
>  	    update_progress($count/$pkg_count, 0.5, 0.75, "extracting $deb");
>  	    print STDERR "extracting: $deb\n";
>  	    syscmd("chroot $targetdir dpkg $dpkg_opts --force-depends --no-triggers --unpack /tmp/pkg/$deb") == 0