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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 "${*:-Something is wrong.}"; }
notice() { msg Notice "$*"; }
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" != "$line" ] || return
eval "conf_${1}_$k=\$v"
done < "$1".conf
}
inquire_var() { _inquire_var "$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: $f"
done
}
set -e
builddir=_build
mkdir -p "$builddir"
for f in part*.conf
do
notice "Processing $f"
img=${f%.conf}
read_config_file "$img" || 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/$img
if inquire_var rebuild
then
case "$rebuild" in
always) ;;
never) ;;
*) 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 "$type" in
efi-system-partition) mkfs.vfat "$tmp" || die "mkfs.vfat failed" ;;
bios-grub) mkfs.vfat "$tmp" || die "mkfs.vfat failed" ;;
samizdat-keys) mkfs.btrfs -q "$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 $imgfile"
fi
done
if [ "$UID" = 0 ]
then sudo=
else sudo=sudo
fi
map_name=samline
quietly()
{
"$@" >/dev/null 2>&1 || true
}
quietly $sudo dmsetup remove "$map_name"
quietly $sudo losetup -D
start=0
map=$builddir/dmsetup.map
: > "$map"
for f in part*.conf
do
part=$builddir/${f%.conf}
if [ -h "$part" ]
then
partuuid=$(readlink -e "$part")
else
partuuid=
fi
#stat -L --format="$part %s" "$part"
$sudo losetup -L -f "$part"
dev=$(losetup -j "$part" -O NAME --noheadings)
devsz=$($sudo blockdev --getsz $dev)
printf '%d %d linear %s 0\n' $start $devsz "$dev" >> "$map"
start=$((start + devsz))
done
$sudo dmsetup -v create "$map_name" "$map"
$sudo dmsetup remove "$map_name"
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