[Bug 1701102] [NEW] partman-auto-raid refuses to allow /boot inside raid + LVM when using preseed.cfg partman-auto/expert_recipe

[James A. T. Rice]

Public bug reported:

Having /boot reside inside a logical volume as part of a mdraid mirror
does work when configured manually, however it is impossible to preseed
with partman-auto/expert_recipe.

At some point, preseeding "partman-auto-lvm/no_boot boolean true" started to allow /boot to be inside LVM - partman-auto-lvm-56ubuntu1/lib/auto-lvm.sh contains:
        # Make sure a boot partition isn't marked as lvmok, unless the user
        # has told us it is ok for /boot to reside on a logical volume
        if echo "$scheme" | grep lvmok | grep -q "[[:space:]]/boot[[:space:]]"; then
                db_input critical partman-auto-lvm/no_boot || true
                db_go || return 255
                db_get partman-auto-lvm/no_boot || true
                [ "$RET" = true ] || bail_out unusable_recipe
        fi
)

However, partman-auto-raid-30ubuntu1/display.d/initial_auto_raid_lvm doesn't allow exceptions, and /boot can not be inside an lvm on raid volumes:
# Make sure a boot partition isn't marked as lvmok
if echo "$scheme" | grep lvmok | grep -q "[[:space:]]/boot[[:space:]]"; then
        bail_out unusable_recipe
fi


Could a relaxed check similar to partman-auto-lvm be added to partman-auto-raid, so that /boot inside LVM inside mdraid can be preseeded as part of partman-auto/expert_recipe?

Thanks
James


d-i partman-auto/method string raid
d-i partman-auto/disk string /dev/sda /dev/sdb
d-i partman-auto-lvm/no_boot boolean true
d-i partman-auto-raid/recipe string                     \
        1 2 0 lvm - raidid=1 .
d-i partman-auto/expert_recipe string                   \
        myrecipe ::                                     \
                1000 5000 40000 raid                    \
                        $lvmignore{ }                   \
                        $primary{ }                     \
                        method{ raid }                  \
                        raidid{ 1 }                     \
                .                                       \
                1000 1000 1000 ext4                     \
                        $defaultignore{ }               \
                        $lvmok{ }                       \
                        method{ format }                \
                        format{ }                       \
                        use_filesystem{ }               \
                        filesystem{ ext4 }              \
                        mountpoint{ /boot }             \
                .                                       \
                6000 6000 6000 ext4                     \
                        $defaultignore{ }               \
                        $lvmok{ }                       \
                        method{ format }                \
                        format{ }                       \
                        use_filesystem{ }               \
                        filesystem{ ext4 }              \
                        mountpoint{ / }                 \
                .

** Affects: partman-auto-raid (Ubuntu)
     Importance: High
     Assignee: Colin Watson (cjwatson)
         Status: Fix Committed

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https://bugs.launchpad.net/bugs/1701102

Title:
  partman-auto-raid refuses to allow /boot inside raid + LVM when using
  preseed.cfg partman-auto/expert_recipe

Status in partman-auto-raid package in Ubuntu:
  Fix Committed

Bug description:
  Having /boot reside inside a logical volume as part of a mdraid mirror
  does work when configured manually, however it is impossible to
  preseed with partman-auto/expert_recipe.

  At some point, preseeding "partman-auto-lvm/no_boot boolean true" started to allow /boot to be inside LVM - partman-auto-lvm-56ubuntu1/lib/auto-lvm.sh contains:
          # Make sure a boot partition isn't marked as lvmok, unless the user
          # has told us it is ok for /boot to reside on a logical volume
          if echo "$scheme" | grep lvmok | grep -q "[[:space:]]/boot[[:space:]]"; then
                  db_input critical partman-auto-lvm/no_boot || true
                  db_go || return 255
                  db_get partman-auto-lvm/no_boot || true
                  [ "$RET" = true ] || bail_out unusable_recipe
          fi
  )

  However, partman-auto-raid-30ubuntu1/display.d/initial_auto_raid_lvm doesn't allow exceptions, and /boot can not be inside an lvm on raid volumes:
  # Make sure a boot partition isn't marked as lvmok
  if echo "$scheme" | grep lvmok | grep -q "[[:space:]]/boot[[:space:]]"; then
          bail_out unusable_recipe
  fi

  
  Could a relaxed check similar to partman-auto-lvm be added to partman-auto-raid, so that /boot inside LVM inside mdraid can be preseeded as part of partman-auto/expert_recipe?

  Thanks
  James


  
  d-i partman-auto/method string raid
  d-i partman-auto/disk string /dev/sda /dev/sdb
  d-i partman-auto-lvm/no_boot boolean true
  d-i partman-auto-raid/recipe string                     \
          1 2 0 lvm - raidid=1 .
  d-i partman-auto/expert_recipe string                   \
          myrecipe ::                                     \
                  1000 5000 40000 raid                    \
                          $lvmignore{ }                   \
                          $primary{ }                     \
                          method{ raid }                  \
                          raidid{ 1 }                     \
                  .                                       \
                  1000 1000 1000 ext4                     \
                          $defaultignore{ }               \
                          $lvmok{ }                       \
                          method{ format }                \
                          format{ }                       \
                          use_filesystem{ }               \
                          filesystem{ ext4 }              \
                          mountpoint{ /boot }             \
                  .                                       \
                  6000 6000 6000 ext4                     \
                          $defaultignore{ }               \
                          $lvmok{ }                       \
                          method{ format }                \
                          format{ }                       \
                          use_filesystem{ }               \
                          filesystem{ ext4 }              \
                          mountpoint{ / }                 \
                  .

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