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#!/bin/bash
#
# Install to multiple ESPs
set -e
# Most of this is copy-paste from grub postinst, sigh.
. /usr/share/debconf/confmodule
# shamelessly stolen from ucf:
#
# Load our templates, just in case our template has
# not been loaded or the Debconf DB lost or corrupted
# since then.
db_x_loadtemplatefile "$(dpkg-query --control-path grub-common templates)" grub-common
###############################################################################
# COPY FROM POSTINST
###############################################################################
# This only works on a Linux system with udev running. This is probably the
# vast majority of systems where we need any of this, though, and we fall
# back reasonably gracefully if we don't have it.
cached_available_ids=
available_ids()
{
local id path
if [ "$cached_available_ids" ]; then
echo "$cached_available_ids"
return
fi
[ -d /dev/disk/by-id ] || return
cached_available_ids="$(
for path in /dev/disk/by-id/*; do
[ -e "$path" ] || continue
printf '%s %s\n' "$path" "$(readlink -f "$path")"
done | sort -k2 -s -u | cut -d' ' -f1
)"
echo "$cached_available_ids"
}
# Returns non-zero and no output if no mapping can be found.
device_to_id()
{
local id
for id in $(available_ids); do
if [ "$(readlink -f "$id")" = "$(readlink -f "$1")" ]; then
echo "$id"
return 0
fi
done
# Fall back to the plain device name if there's no by-id link for it.
if [ -e "$1" ]; then
echo "$1"
return 0
fi
return 1
}
# for Linux
sysfs_size()
{
local num_sectors sector_size size
# Try to find out the size without relying on a partitioning tool being
# installed. This isn't too hard on Linux 2.6 with sysfs, but we have to
# try a couple of variants on detection of the sector size.
if [ -e "$1/size" ]; then
num_sectors="$(cat "$1/size")"
sector_size=512
if [ -e "$1/queue/logical_block_size" ]; then
sector_size="$(cat "$1/queue/logical_block_size")"
elif [ -e "$1/queue/hw_sector_size" ]; then
sector_size="$(cat "$1/queue/hw_sector_size")"
fi
size="$(expr "$num_sectors" \* "$sector_size" / 1000 / 1000)"
fi
[ "$size" ] || size='???'
echo "$size"
}
# for kFreeBSD
camcontrol_size()
{
local num_sectors sector_size size=
if num_sectors="$(camcontrol readcap "$1" -q -s -N)"; then
sector_size="$(camcontrol readcap "$1" -q -b)"
size="$(expr "$num_sectors" \* "$sector_size" / 1000 / 1000)"
fi
[ "$size" ] || size='???'
echo "$size"
}
maybe_udevadm()
{
if which udevadm >/dev/null 2>&1; then
udevadm "$@" || true
fi
}
# Parse /proc/mounts and find out the mount for the given device.
# The device must be a real device in /dev, not a symlink to one.
get_mounted_device()
{
mountpoint="$1"
cat /proc/mounts | while read -r line; do
set -f
set -- $line
set +f
if [ "$2" = "$mountpoint" ]; then
echo "$1"
break
fi
done
}
###############################################################################
# New or modified helpers
###############################################################################
# Fixed: Return nothing if the argument is empty
get_mountpoint()
{
local relpath boot_mountpoint
if [ -z "$1" ]; then
return
fi
relpath="$(grub-mkrelpath "$1")"
boot_mountpoint="${1#$relpath}"
echo "${boot_mountpoint:-/}"
}
# Returns value in $RET, like a debconf command.
#
# Merged version of describe_disk and describe_partition, as disks can't be
# valid ESPs on their own, so we can't render them as an entry.
describe_efi_system_partition()
{
local disk part id path sysfs_path diskbase partbase size
local disk_basename disk_size model
disk="$1"
part="$2"
id="$3"
path="$4"
# BEGIN: Stolen from describe_disk
model=
case $(uname -s) in
Linux)
sysfs_path="$(maybe_udevadm info -n "$disk" -q path)"
if [ -z "$sysfs_path" ]; then
sysfs_path="/block/$(printf %s "${disk#/dev/}" | sed 's,/,!,g')"
fi
disk_size="$(sysfs_size "/sys$sysfs_path")"
model="$(maybe_udevadm info -n "$disk" -q property | sed -n 's/^ID_MODEL=//p')"
if [ -z "$model" ]; then
model="$(maybe_udevadm info -n "$disk" -q property | sed -n 's/^DM_NAME=//p')"
if [ -z "$model" ]; then
model="$(maybe_udevadm info -n "$disk" -q property | sed -n 's/^MD_NAME=//p')"
if [ -z "$model" ] && which dmsetup >/dev/null 2>&1; then
model="$(dmsetup info -c --noheadings -o name "$disk" 2>/dev/null || true)"
fi
fi
fi
;;
GNU/kFreeBSD)
disk_basename=$(basename "$disk")
disk_size="$(camcontrol_size "$disk_basename")"
model="$(camcontrol inquiry "$disk_basename" | sed -ne "s/^pass0: <\([^>]*\)>.*/\1/p")"
;;
esac
[ "$model" ] || model='???'
# END: Stolen from describe_disk
sysfs_path="$(maybe_udevadm info -n "$part" -q path)"
if [ -z "$sysfs_path" ]; then
diskbase="${disk#/dev/}"
diskbase="$(printf %s "$diskbase" | sed 's,/,!,g')"
partbase="${part#/dev/}"
partbase="$(printf %s "$partbase" | sed 's,/,!,g')"
sysfs_path="/block/$diskbase/$partbase"
fi
size="$(sysfs_size "/sys$sysfs_path")"
db_subst grub-efi/partition_description DEVICE "$part"
db_subst grub-efi/partition_description SIZE "$size"
db_subst grub-efi/partition_description PATH "$path"
db_subst grub-efi/partition_description DISK_MODEL "$model"
db_subst grub-efi/partition_description DISK_SIZE "$disk_size"
db_metaget grub-efi/partition_description description
}
# Parse /proc/mounts and find out the mount for the given device.
# The device must be a real device in /dev, not a symlink to one.
find_mount_point()
{
real_device="$1"
cat /proc/mounts | while read -r line; do
set -f
set -- $line
set +f
if [ "$1" = "$real_device" -a "$3" = "vfat" ]; then
echo "$2"
break
fi
done
}
# Return all devices that are a valid ESP
usable_efi_system_partitions()
{
local last_partition path partition partition_id
local ID_PART_ENTRY_TYPE ID_PART_ENTRY_SCHEME
last_partition=
(
for partition in /dev/disk/by-id/*; do
ID_PART_ENTRY_TYPE=""
ID_PART_ENTRY_SCHEME=""
eval "$(udevadm info -q property -n "$partition" | grep -E '^ID_PART_ENTRY_(TYPE|SCHEME)=')"
if [ -z "$ID_PART_ENTRY_TYPE" -o -z "$ID_PART_ENTRY_SCHEME" -o \
\( "$ID_PART_ENTRY_SCHEME" != gpt -a "$ID_PART_ENTRY_SCHEME" != dos \) -o \
\( "$ID_PART_ENTRY_SCHEME" = gpt -a "$ID_PART_ENTRY_TYPE" != c12a7328-f81f-11d2-ba4b-00a0c93ec93b \) -o \
\( "$ID_PART_ENTRY_SCHEME" = dos -a "$ID_PART_ENTRY_TYPE" != 0xef \) ]; then
continue
fi
# unify the partition id
partition_id="$(device_to_id "$partition" || true)"
real_device="$(readlink -f "$partition")"
path="$(find_mount_point $real_device)"
echo "$path:$partition_id"
done
) | sort -t: -k2 -u
}
###############################################################################
# MAGIC SCRIPT
###############################################################################
# Just do regular installation to /boot/efi on cloud images
db_get grub-efi/cloud_style_installation || true
if [ "$RET" = true ]; then
grub-install "$@"
touch /boot/grub/grub.cfg
exit 0
fi
FALLBACK_MOUNTPOINT=/var/lib/grub/esp
# Initial install/upgrade from /boot/efi?
db_fget grub-efi/install_devices seen
seen="$RET"
# Get configured value
question=grub-efi/install_devices
priority=high
db_get grub-efi/install_devices
valid=1
# We either migrate /boot/efi over, or we check if we have invalid devices
if [ -z "$RET" ] && [ "$seen" != "true" ]; then
echo "Trying to migrate /boot/efi into esp config"
esp="$(get_mounted_device /boot/efi)"
if [ "$esp" ]; then
esp="$(device_to_id "$esp")"
fi
if [ "$esp" ]; then
db_set grub-efi/install_devices "$esp"
db_fset grub-efi/install_devices seen true
RET="$esp"
fi
else
for device in $RET; do
if [ ! -e "${device%,}" ]; then
valid=0
break
fi
done
fi
# If /boot/efi points to a device that's not in the list, trigger the
# install_devices_disks_changed prompt below, but add the device behind
# /boot/efi to the defaults.
boot_efi_device=$(get_mounted_device /boot/efi || true)
if [ "$boot_efi_device" ]; then
for device in $RET; do
device="${device%,}"
real_device="$(readlink -f "$device" || true)"
if [ "$real_device" = "$boot_efi_device" ]; then
boot_efi_device=""
break
fi
done
if [ "$boot_efi_device" ]; then
boot_efi_device="$(device_to_id "$boot_efi_device" || true)"
if [ "$RET" ]; then
RET="$RET, $boot_efi_device"
else
RET="$boot_efi_device"
fi
valid=0
fi
fi
if [ "$valid" = 0 ]; then
question=grub-efi/install_devices_disks_changed
priority=critical
db_set "$question" "$RET"
db_fset "$question" seen false
db_fset grub-efi/install_devices_empty seen false
fi
while :; do
ids=
descriptions=
partitions="$(usable_efi_system_partitions)"
for partition_pair in $partitions; do
partition_id="${partition_pair#*:}"
device="${partition_id%%-part*}"
ids="${ids:+$ids, }$partition_id"
describe_efi_system_partition "$(readlink -f "$device")" "$(readlink -f "$partition_id")" "$partition_id" "$(get_mountpoint "${partition_pair%%:*}")"
RET="$(printf %s "$RET" | sed 's/,/\\,/g')"
descriptions="${descriptions:+$descriptions, }$RET"
done
db_subst "$question" RAW_CHOICES "$ids"
db_subst "$question" CHOICES "$descriptions"
db_input "$priority" "$question" || true
db_go
db_get "$question"
# Run the installer
failed_devices=
for i in `echo $RET | sed -e 's/, / /g'` ; do
real_device="$(readlink -f "$i")"
mntpoint=$(find_mount_point $real_device)
if [ -z "$mntpoint" ]; then
mntpoint=$FALLBACK_MOUNTPOINT
mount $real_device $mntpoint
fi
echo "Installing grub to $mntpoint." >&2
if _UBUNTU_ALTERNATIVE_ESPS="$RET" grub-install --efi-directory=$mntpoint "$@" ; then
# We just installed GRUB 2; then also generate grub.cfg.
touch /boot/grub/grub.cfg
else
failed_devices="$failed_devices $real_device"
fi
if [ "$mntpoint" = "$FALLBACK_MOUNTPOINT" ]; then
umount $mntpoint
fi
done
if [ "$question" != grub-efi/install_devices ] && [ "$RET" ]; then
# XXX cjwatson 2019-02-26: The description of
# grub-efi/install_devices_disks_changed ought to explain that
# selecting no devices will leave the configuration unchanged
# so that you'll be prompted again next time, but it's a bit
# close to the Debian 10 release to be introducing new
# translatable text. For now, it should be sufficient to
# avoid losing configuration data.
db_set grub-efi/install_devices "$RET"
db_fset grub-efi/install_devices seen true
fi
if [ "$failed_devices" ]; then
db_subst grub-efi/install_devices_failed FAILED_DEVICES "$failed_devices"
db_fset grub-efi/install_devices_failed seen false
if db_input critical grub-efi/install_devices_failed; then
db_go
db_get grub-efi/install_devices_failed
if [ "$RET" = true ]; then
break
else
db_fset "$question" seen false
db_fset grub-efi/install_devices_failed seen false
continue
fi
else
exit 1 # noninteractive
fi
fi
db_get "$question"
if [ -z "$RET" ]; then
# Reset the seen flag if the current answer is false, since
# otherwise we'll loop with no indication of why.
db_get grub-efi/install_devices_empty
if [ "$RET" = false ]; then
db_fset grub-efi/install_devices_empty seen false
fi
if db_input critical grub-efi/install_devices_empty; then
db_go
db_get grub-efi/install_devices_empty
if [ "$RET" = true ]; then
break
else
db_fset "$question" seen false
db_fset grub-efi/install_devices_empty seen false
fi
else
# if question was seen we are done
# Otherwise, abort
db_fget grub-efi/install_devices_empty seen
if [ "$RET" = true ]; then
break
else
exit 1
fi
fi
else
break
fi
done