sys-devel/arc-cache-builder/files/arc_generate_packages_cache

#!/bin/bash

# Copyright 2018 The Chromium OS Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

set -e

# Print usage string
usage() {
  cat <<EOF
Usage: $PROG /path/to/mount/system/image/dir \
/path/to/mount/vendor/image/dir \
/path/to/output/file

Generate packages cache for the provided system and vendor images.

EOF
  if [[ $# -gt 0 ]]; then
    echo "$*" 1>&2
    exit 1
  fi
  exit 0
}

main() {
  local system_mnt=$1
  local vendor_mnt=$2
  local output_file=$3

  if [[ $# -ne 3 ]]; then
    usage "command takes exactly 3 args"
  fi

  java -cp \
    /usr/share/arc-cache-builder/org.chromium.arc.cachebuilder.jar \
    org.chromium.arc.cachebuilder.CacheGenerator \
    --system-root "${system_mnt}" \
    --vendor-root "${vendor_mnt}" \
    --output "${output_file}"
}

main "$@"