[Bug 1993541] Re: initramfs need to mount efivarfs because kernel 6.0 deprecated 'efivars' sysfs interface

[Andreas Hasenack]

Since lunar ships with a 6.x kernel, it doesn't need the check for the
old sysfs interface and the new efivarfs mountpoint, unless you want to
keep it the same, for consistency.

I.e., currently we have:

kinetic, jammy:
+if [ -d /sys/firmware/efi/efivars ] && ! [ -d /sys/firmware/efi/vars ]; then
+       mount -t efivarfs -o rw,nosuid,nodev,noexec,relatime efivarfs /sys/firmware/efi/efivars
+fi

lunar, mantic:
+if [ -d /sys/firmware/efi/efivars ]; then
+       mount -t efivarfs -o rw,nosuid,nodev,noexec,relatime efivarfs /sys/firmware/efi/efivars
+fi

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Title:
  initramfs need to mount efivarfs because kernel 6.0 deprecated
  'efivars' sysfs interface

Status in OEM Priority Project:
  In Progress
Status in mdadm package in Ubuntu:
  In Progress
Status in mdadm source package in Jammy:
  Fix Committed
Status in mdadm source package in Kinetic:
  Fix Committed
Status in mdadm package in Debian:
  Fix Released

Bug description:
  [ Impact ]

  kernel 6.0 deprecated efivars sysfs interface [1]. For Intel VROC
  RAID, mdadm needs initramfs to mount efivarfs instead.

  [1] The commit:
  commit 0f5b2c69a4cbe4166ca24b76d5ada98ed2867741
  Author: Ard Biesheuvel <ardb at kernel.org>
  Date: Mon Jun 20 13:34:03 2022 +0200

      efi: vars: Remove deprecated 'efivars' sysfs interface

  [ Test Plan ]

  1. Install initramfs-tools
  2. update-initramfs -u
  3. unmkinitramfs initrd.img-`uname -r` /tmp/extract-initramfs
  4. Check if boot script 00_mount_efivarfs exists in directory /tmp/extract-initramfs/main/scripts/init-top/
  5. Check /tmp/extract-initramfs/main/scripts/init-top/ORDER if the boot script 00_mount_efivarfs will be execute before udev.

  [ Where problems could occur ]

  Not sure if there any other tools/utilities also need to mount efivarfs as early as mdadm but the probability of file conflict should be very low.
  Also, there are no impact mounting efivarfs multiple times.
  mount: /sys/firmware/efi/efivars: efivarfs already mounted on /sys/firmware/efi/efivars.

  [ Scope ]

  Jammy

  [ Other Info ]

  The private bug link
  https://bugs.launchpad.net/somerville/+bug/1990231

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