pixel: Add shell script to extract factory images

Change-Id: Iecc2703200944c4a5448ec4b2b897f6fd14be676

pixel/extract-factory-image.sh

@@ -0,0 +1,74 @@
+#!/bin/bash
+#
+# extract:
+#
+#   Extract Pixel factory images
+#
+#
+##############################################################################
+
+
+### SET ###
+
+# use bash strict mode
+set -euo pipefail
+
+
+### TRAPS ###
+
+# trap signals for clean exit
+trap 'exit $?' EXIT
+trap 'error_m interrupted!' SIGINT
+
+### CONSTANTS ###
+readonly script_path="$(cd "$(dirname "$0")";pwd -P)"
+readonly vars_path="${script_path}/../vars/"
+
+readonly work_dir="${WORK_DIR:-/tmp/pixel}"
+
+source "${vars_path}/devices"
+
+readonly device="${1}"
+source "${vars_path}/${device}"
+
+## HELP MESSAGE (USAGE INFO)
+# TODO
+
+### FUNCTIONS ###
+
+extract_factory_image() {
+  local factory_dir="${work_dir}/${device}/${build_id}/factory"
+  mkdir -p "${factory_dir}"
+  local factory_zip="${work_dir}/${device}/${build_id}/$(basename ${image_url})"
+  echo "${image_sha256} ${factory_zip}" | sha256sum --check --status
+  pushd "${factory_dir}"
+  unzip -o "${factory_zip}"
+  pushd ${device}-${build_id,,}
+  unzip -o "image-${device}-${build_id,,}.zip" -d "image"
+  popd
+  popd
+}
+
+# error message
+# ARG1: error message for STDERR
+# ARG2: error status
+error_m() {
+  echo "ERROR: ${1:-'failed.'}" 1>&2
+  return "${2:-1}"
+}
+
+# print help message.
+help_message() {
+  echo "${help_message:-'No help available.'}"
+}
+
+main() {
+  extract_factory_image
+}
+
+### RUN PROGRAM ###
+
+main "${@}"
+
+
+##