Fix for proper LVM support

Without this fix, a LVM based ubuntu-minimal image will fail
booting due to the fact that the boot process will not be able
to retrieve the root filesystem using LABEL=(cloud)img-rootfs

Change-Id: If4ecf65868563f7b799160a58af6312bedf956bf
This commit is contained in:
Olivier Bourdon 2018-06-18 17:19:02 +02:00 committed by Olivier Bourdon
parent 927e8115f6
commit caf565673b
5 changed files with 102 additions and 0 deletions

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=====
lvm
=====
This is the LVM support element for Ubuntu Xenial.
Note that this element requires initramfs-tools and lvm2
packages to be added to the DIB image using -p option.
If this is not the case, an error will be triggered.
This element enables that an image build with a customized
DIB_BLOCK_DEVICE_CONFIG containing LVM volumes will boot
properly.
On CentOS like distributions, you should use dracut-regenerate
element instead of current lvm element.

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bootloader
pkg-map
ubuntu-minimal

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#!/bin/bash
# Configure grub. Note that the various conditionals here are to handle
# different distributions gracefully.
if [ ${DIB_DEBUG_TRACE:-1} -gt 0 ]; then
set -x
fi
set -eu
set -o pipefail
BOOT_DEV=$IMAGE_BLOCK_DEVICE
# All available devices, handy for some bootloaders...
declare -A DEVICES
eval DEVICES=( $IMAGE_BLOCK_DEVICES )
# This might be better factored out into a per-distro 'install-bootblock'
# helper.
if [ -d /boot/grub2 ]; then
GRUB_CFG=/boot/grub2/grub.cfg
elif [ -d /boot/grub ]; then
GRUB_CFG=/boot/grub/grub.cfg
fi
if type grub2-mkconfig >/dev/null; then
GRUB_MKCONFIG="grub2-mkconfig -o $GRUB_CFG"
else
GRUB_MKCONFIG="grub-mkconfig -o $GRUB_CFG"
fi
# Retrieve root filesystem mount point to check if it is LVM based
ROOTFS=$(awk '$2=="/"{print}' /proc/mounts)
# Standard filesystems are mounted as /dev/mapper/loop* within DIB
# so we need to exclude this case
if echo "$ROOTFS" | grep -qv '/dev/mapper/loop'; then
# LVM based filesystems are mounted as /dev/mapper/<VG_name>-<LV-NAME> within DIB
if echo "$ROOTFS" | grep -q '/dev/mapper/'; then
# Check if initramfs-tools are installed
if [ ! -d /etc/initramfs-tools ]; then
echo "You must have initramfs-tools installed for LVM based root filesystem to work properly"
exit 1
fi
# Check if system supports LVM
if ! type pvs >/dev/null 2>&1; then
echo "You must have lvm2 package installed for LVM based root filesystem to work properly"
exit 1
fi
# Check for appropriate filesystem support (for fsck)
FSTYPE=$(echo $ROOTFS | awk '{print $3}')
if ! type fsck.$FSTYPE >/dev/null 2>&1; then
echo "You must have utility package for $FSTYPE filesystem installed for LVM based root filesystem to work properly (fsck.$FSTYPE is missing)"
exit 1
fi
# Change the current GRUB_DEVICE from LABEL=(cloud)img-rootfs to /dev/mapper/...
sed -i -e "s?^GRUB_DEVICE=.*?GRUB_DEVICE=$(echo $ROOTFS | awk '{print $1}')?" /etc/default/grub
# This is required for LVM2 driver to be included in the
# ramdisk of the image.
echo "lvm2" >> /etc/initramfs-tools/modules
# We need to regenerated the init ramdisk at this point
update-initramfs -u -v
fi
fi
$GRUB_MKCONFIG

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lvm2:
initramfs-tools:

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#!/bin/bash
if [ ${DIB_DEBUG_TRACE:-0} -gt 0 ]; then
set -x
fi
set -eu
set -o pipefail
if [ 'ubuntu' != $DISTRO_NAME ]; then
echo "Only ubuntu is supported for LVM support. The DISTRO is set to $DISTRO_NAME"
exit 1
fi
if [ 'xenial' != $DIB_RELEASE ]; then
echo "Only xenial is supported for LVM support. The DIB_RELEASE is set to $DIB_RELEASE"
exit 1
fi