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#!/bin/bash
if [ $# -ne 3 ]; then
echo "Usage: $0 <vbmeta.img> <system.img> <VbmetaBootParams.textproto>"
exit 1
fi
# Example Output from 'avbtool calculate_vbmeta_digest --image $OUT/vbmeta.img':
# 3254db8a232946c712b5c6f8c1a80b31f2a200bab98553d86f5915d06bfd5436
#
# Example Output from 'avbtool info_image --image $OUT/vbmeta.img':
#
# Minimum libavb version: 1.0
# Header Block: 256 bytes
# Authentication Block: 576 bytes
# Auxiliary Block: 1600 bytes
# Algorithm: SHA256_RSA4096
# Rollback Index: 0
# Flags: 0
# Release String: 'avbtool 1.1.0'
# Descriptors:
# ...
#
#
set -e
function die {
echo $1 >&2
exit 1
}
# Incrementing major version causes emulator binaries that do not support the
# version to ignore this file. This can be useful if there is a change
# not supported by older emulator binaries.
readonly MAJOR_VERSION=2
readonly VBMETAIMG=$1
readonly SYSIMG=$2
readonly TARGET=$3
# Extract the digest
readonly VBMETA_DIGEST=$(${AVBTOOL:-avbtool} calculate_vbmeta_digest --image $VBMETAIMG)
readonly INFO_OUTPUT=$(${AVBTOOL:-avbtool} info_image --image $VBMETAIMG | grep "^Algorithm:")
# Extract the algorithm
readonly ALG_OUTPUT=$(echo $INFO_OUTPUT | grep "Algorithm:")
readonly ALG_SPLIT=($(echo $ALG_OUTPUT | tr ' ' '\n'))
readonly ORG_ALGORITHM=${ALG_SPLIT[1]}
if [[ $ORG_ALGORITHM == "SHA256_RSA4096" ]]; then
VBMETA_HASH_ALG=sha256
else
die "Don't know anything about $ORG_ALGORITHM"
fi
# extract the size
function get_bytes {
MY_OUTPUT=$(${AVBTOOL:-avbtool} info_image --image $1 | grep "$2" )
MY_SPLIT=($(echo $MY_OUTPUT | tr ' ' '\n'))
MY_BYTES=${MY_SPLIT[2]}
echo $MY_BYTES
}
HEADER_SIZE=$(get_bytes $VBMETAIMG "Header Block:")
AUTHEN_SIZE=$(get_bytes $VBMETAIMG "Authentication Block:")
AUX_SIZE=$(get_bytes $VBMETAIMG "Auxiliary Block:")
SYSMETA_SIZE=$(get_bytes $SYSIMG "VBMeta size:")
VBMETA_SIZE=$(expr $HEADER_SIZE + $AUTHEN_SIZE + $AUX_SIZE + $SYSMETA_SIZE)
HEADER_COMMENT="# androidboot.vbmeta.size=$VBMETA_SIZE androidboot.vbmeta.hash_alg=$VBMETA_HASH_ALG androidboot.vbmeta.digest=$VBMETA_DIGEST"
echo $HEADER_COMMENT > $TARGET
echo "major_version: $MAJOR_VERSION" >> $TARGET
#echo "param: \"androidboot.slot_suffix=_a\"" >> $TARGET
echo "param: \"androidboot.vbmeta.size=$VBMETA_SIZE\"" >> $TARGET
echo "param: \"androidboot.vbmeta.hash_alg=$VBMETA_HASH_ALG\"" >> $TARGET
echo "param: \"androidboot.vbmeta.digest=$VBMETA_DIGEST\"" >> $TARGET
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