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[systemd.io] Subject: Re: [pve-devel] [PATCH pve-kernel-meta 3/5] proxmox-boot: fix #3671 add pin/unpin for kernel-version X-BeenThere: pve-devel@lists.proxmox.com X-Mailman-Version: 2.1.29 Precedence: list List-Id: Proxmox VE development discussion List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 01 Feb 2022 11:35:48 -0000 On January 31, 2022 6:59 pm, Stoiko Ivanov wrote: > The 2 commands follow the mechanics of p-b-t kernel add/remove in > writing the desired abi-version to a config-file in /etc/kernel and > actually modifying the boot-loader configuration upon p-b-t refresh. >=20 > A dedicated new file is used instead of writing the version (with some > kind of annotation) to the manual kernel list to keep parsing the file > simple (and hopefully also cause fewer problems with manually edited > files) one thing I noticed while playing around - the following sequence of=20 actions is a bit surprising: - pin (old) version FOO - refresh - ... (long time, different admin, ..) - apt remove pve-kernel-$FOO while this prints No linux-image /boot/vmlinuz-$FOO found - skipping this is kind of hard to understand without knowing about p-b-t internals, skipping here means we don't copy the kernel/initrd from /boot to the=20 ESP (since there is no source). now the $FOO kernel (and initrd) are on=20 the ESPs, but not in /boot. since the package is no longer installed,=20 future ABI-compatible upgrades are not installed, and the initrd is=20 never regenerated when triggered by other factors. worse, if I pinned that kernel for important reasons (e.g., HW-compat),=20 removing the pin (via unpin, pinning another version, or next-boot to=20 try whether an updated kernel improves the situation!) will remove the=20 only copy of it.. I am not sure what we can do here (except making the message more=20 prominent?) - failing apt is ugly, removing the kernel on the ESP when=20 removing it from /boot despite it being pinned only makes it worse.. OTOH since a pinned kernel is by definition never auto-removed, hooking=20 into the APT hook might work since that would mean the removal is never=20 started, and the resulting dpkg/apt state is clean? obviously only=20 possible for our kernels where we know the naming scheme, anything=20 custom could still run into the issue.. > For systemd-boot we write the entry into the loader.conf on the ESP(s) > instead of relying on the `bootctl set-default` mechanics (bootctl(1)) > which write the entry in an EFI-var. This was preferred, because of a > few reports of unwriteable EFI-vars on some systems (e.g. DELL servers > have a setting preventing writing EFI-vars from the OS). The rationale > in `Why not simply rely on the EFI boot menu logic?` from [0] also > makes a few points in that direction. >=20 > For grub the following choices were made: > * write the pinned version (or actually the menu-path leading to it) > to /etc/default/grub instead of editing the grub.cfg files on the > partition. Mostly to divert as little as possible from the > grub-workflow I assume people are used to. did you test whether adding a snippet overriding GRUB_DEFAULT also=20 works? we already do that to set the distributor for the various=20 products.. creating/deleting a=20 /etc/default/grub.d/y_proxmox_pinned_kernel.cfg and (if we want to make the latter be separate from pinning, see other=20 mail) /etc/default/grub.d/z_proxmox_next_boot.cfg seems like the cleaner approach compared to modifying the admin-managed=20 /etc/default/grub .. > * the 'root-device-id' part of the menu-entries is parsed from > /boot/grub/grug.cfg since it was stable (the same on all ESPs and in > /boot/grub), saves us from copying the part of "find device behind > /, mangle it if zfs/btrfs, call grub_probe a few times" part of > grub-mkconfig - and seems a bit more robust >=20 > Tested with a BIOS and an UEFI VM with / on ZFS. >=20 > [0] https://systemd.io/BOOT_LOADER_SPECIFICATION/ >=20 > Signed-off-by: Stoiko Ivanov