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|
#!/bin/bash
shopt -s nullglob
PATH=/sbin:$PATH
msg() { printf '%s: %s: %s\n' "$0" "$1" "$2" >&2; }
die() { msg Error "${*:-Exiting on fatal error.}"; exit 1; }
warn() { msg Warning "${*:-Something is wrong.}"; }
notice() { msg Notice "$*"; }
quietly() { "$@" >/dev/null 2>&1 || true; }
loudly() { (set -x; "$@"); }
validate_name()
{
case "$1" in
*[^a-zA-Z0-9_]*) false ;;
*) true ;;
esac
}
read_config_file()
{
validate_name "$img" || { warn "invalid name: $img"; return 1; }
while read line
do
line=${line%%#*} # ignore comments
k=${line%%=*}
v=${line#*=}
[ "$k" -a "$k" != "$line" ] || return
eval "conf_${img}_$k=\$v"
done < "$img".conf
}
inquire_var() { _inquire_var "$img" "$1"; }
_inquire_var()
{
local v
v=conf_${1}_${2}
v=${!v}
if [ "$v" ]
then
eval "$2=\$v"
else
false
fi
}
require_var() { _require_var "$img" "$1"; }
_require_var()
{
_inquire_var "$@" || die "Missing required field '$2' for image file '$1'"
}
get_root_hash()
{
sed -ne 's/^Root hash:[ \t]*//p' "$1"
}
require_exists()
{
local f
for f
do
[ -f "$f" ] || die "Not a file: $f"
done
}
build_partition_image()
{
if inquire_var rebuild
then
case "$rebuild" in
always|never|default) ;;
*) die "invalid value for field 'rebuild': $rebuild" ;;
esac
fi
if [ "$rebuild" = 'always' ] || [ ! -e "$imgfile" -a "$rebuild" != 'never' ]
then
if [ -e "$imgfile" ]
then
notice "Image file exists: $imgfile"
fi
case "$type" in
dm-verity-hashes|dm-verity-data)
require_var data_path
require_exists "$data_path" "$data_path".verity "$data_path".verity.log
root_hash=$(get_root_hash "$data_path".verity.log)
[ ${#root_hash} = 64 ]
;;
*)
require_var allocation
tmp=$imgfile~tmp
fallocate -l "$allocation" "$tmp"
;;
esac
case "$type" in
efi-system-partition) mkfs.fat -F 32 -I "$tmp" || die "mkfs.vfat failed" ;;
bios-grub) mkfs.fat -F 32 -I "$tmp" || die "mkfs.vfat failed" ;;
samizdat-keys) mkfs.btrfs -q "$tmp" || die "mkfs.btrfs failed" ;;
dm-verity-data)
partuuid=${root_hash:0:32}
cp -f -T --reflink "$data_path" "$builddir"/"$partuuid"
ln -sfT "$partuuid" "$tmp"
;;
dm-verity-hashes)
partuuid=${root_hash:32:32}
cp -f -T --reflink "$data_path".verity "$builddir"/"$partuuid"
ln -sfT "$partuuid" "$tmp"
;;
esac
mv -T "$tmp" "$imgfile"
notice "Successfully wrote $imgfile"
fi
}
iterate_partitions()
{
local f
for f in part*.conf
do
notice "Processing $f"
img=${f%.conf}
read_config_file || warn "Received error return from command: read_config_file $img"
require_var name
require_var type
case "$type" in
efi-system-partition|bios-grub|samizdat-*) ;;
dm-verity-hashes|dm-verity-data) require_var data_path ;;
partition-table) ;;
*) die "invalid type: $type" ;;
esac
imgfile=$builddir/$img
"$@" || return
done
}
set_var()
{
eval "conf_${img}_${1}=\$${1}"
}
create_dmsetup_map()
{
part=$builddir/${f%.conf}
if [ -h "$part" ]
then
partuuid=$(readlink -e "$part")
else
partuuid=
fi
$sudo losetup -L -f "$part"
dev=$(losetup -j "$part" -O NAME --noheadings)
devsz=$($sudo blockdev --getsz $dev)
alignment_error=$((devsz % 2048))
printf '%d %d linear %s 0\n' $start $devsz "$dev" >> "$map"
set_var start
set_var devsz
start=$((start + devsz))
if [ $alignment_error -gt 0 ]
then
devsz=$((2048 - alignment_error))
printf '%d %d zero\n' $start $devsz >> "$map"
start=$((start + devsz))
fi
}
create_ptable_conf_debug()
{
set -x
create_ptable_conf "$@"
set +x
}
create_ptable_conf()
{
#inquire_var start && inquire_var devsz || return
part=$builddir/${f%.conf}
devsz=$(stat -L -c '%s' "$part") || return
[ "$start" -a "$devsz" ] || return
[ "$((devsz % 512))" -eq 0 ]
case "$type" in
partition-table) start=$((start + devsz)); return;;
efi-system-partition) typecode=C12A7328-F81F-11D2-BA4B-00A0C93EC93B ;;
# bios-grub) typecode=21686148-6449-6E6F-744E-656564454649 ;;
*) typecode=0FC63DAF-8483-4772-8E79-3D69D8477DE4 ;;
esac
printf '%d: start=%d, size=%d, type=%s, name="%s"\n' \
"$i" \
"$((start / 512))" \
"$((devsz / 512))" \
"$typecode" \
"$name" \
>> "$ptable.sfdisk"
let ++i
start=$((start + devsz))
}
set -e
builddir=_build
mkdir -p "$builddir"
iterate_partitions build_partition_image
if [ "$UID" = 0 ]
then sudo=
else sudo=sudo
fi
if whole=$(losetup -j whole.img -O NAME --noheadings)
then
quietly $sudo umount *.mnt
quietly $sudo kpartx -dv "$whole"
quietly $sudo losetup -D
fi
sfdisk_init()
{
local DEV LAST LAST_LBA
DEV=$1
if [ -b "$DEV" ]
then
LAST=$($sudo blockdev --getsize64 "$DEV") || return
else
LAST=$(stat -L -c%s "$DEV") || return
fi
LAST_LBA=$((LAST / 512 - 34))
cat <<END
label: gpt
unit: sectors
first-lba: 34
last-lba: ${LAST_LBA}
END
}
pee_on_table()
{
local dev="$1"
ptable=$builddir/ptable.bin
i=1
start=0
sfdisk_init "$dev" > "$ptable".sfdisk
iterate_partitions create_ptable_conf_debug
cat "$ptable".sfdisk >&2
set -x
$sudo sfdisk "$dev" < "$ptable".sfdisk || return
$sudo sfdisk --dump "$dev" || return
$sudo sfdisk -Y MBR --dump "$dev" || return
}
truncate -s0 whole.img
for f in part*.conf
do
f=$(readlink -e _build/"${f%.conf}") || break
ficlonerange.py "$f" whole.img
done
$sudo losetup -L -f whole.img
whole=$(losetup -j whole.img -O NAME --noheadings)
(pee_on_table "$whole") || exit
$sudo kpartx -u "$whole"
for f in part*.conf
do
[ "$f" != part0.conf ] || continue
notice "Processing $f"
img=${f%.conf}
dev=/dev/mapper/${whole#/dev/}p${img#part}
mnt=${f%.conf}.mnt
read_config_file || warn "Received error return from command: read_config_file $img"
require_var name
require_var type
case "$type" in
dm-verity-hashes|partition-table) ;;
efi-system-partition|bios-grub)
mkdir -p "$mnt"
loudly $sudo mount "$dev" "$mnt"
if [ "$type" = 'bios-grub' ]
then
$sudo mkdir "$mnt"/grub
BOOT_DIR=$mnt
else
EFI_DIR=$mnt
fi
;;
*) mkdir -p "$mnt"
loudly $sudo mount "$dev" "$mnt"
;;
*) notice "Not mounting $name" ;;
esac
done
loudly $sudo grub-install --force --target=i386-pc --recheck --boot-directory="$BOOT_DIR" "$whole"
loudly $sudo grub-install --force --target=x86_64-efi --removable --efi-directory="$EFI_DIR" "$whole"
for f in part*.conf
do
mnt=${f%.conf}.mnt
if mountpoint -q "$mnt"
then
loudly $sudo umount "$mnt"
$sudo rmdir "$mnt"
fi
done
loudly $sudo kpartx -d "$whole"
loudly $sudo losetup -d "$whole"
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