Provide a script to update the generated Android.bp

modify_bp_for_hwasan.sh updates the generated Android.bp to use
hwasan prebuilt libraries.

Bug: 234772527
Test: modify_bp_for_hwasan.sh Android.bp arch-arm64-armv8/hwasan
      modify_bp_for_hwasan.sh Android.bp restore
Change-Id: I1443200297119d162b680bd8ddd87a9e4ced2e31

vendor_snapshot/modify_bp_for_hwasan.sh

@@ -0,0 +1,60 @@
+#!/bin/bash -e
+#
+# Copyright (C) 2022 The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+function usage {
+  cat <<EOF
+Usage: $0 <Android_bp_path> <hwasan_snapshots_dir>|restore
+
+ Read <hwasan_snapshots_dir> to update the Android.bp file of <Android_bp_path>
+ to use the hwasan prebuilt static libraries instead of the cfi libraries.
+ <hwasan_snapshots_dir> must be the relative path to the <Android_bp_path>.
+ If 'restore' is set, it will revert the modification.
+EOF
+  exit 1
+}
+
+if [[ "$#" != 2 ]]; then
+  usage
+fi
+
+bp_path="$1"
+bp_org_path="$bp_path".original
+
+if [[ "$2" != "restore" ]]; then
+  if [[ -f "$bp_org_path" ]]; then
+    echo Already updated. Try again after restoring the bp file with the \"restore\" option.
+    exit 1
+  fi
+  hwasan_dir="${2%/}"
+  modules=`ls $(dirname "$bp_path")/"$hwasan_dir"/*.a | xargs -n 1 basename -s .a`
+
+  cp $bp_path $bp_org_path
+  for module in $modules; do
+    echo Modifying $module...
+    bpmodify -w -m $module -move-property -property arch.arm64.cfi -new-location hwasan $bp_path
+    bpmodify -w -m $module -property arch.arm64.hwasan.src -str $hwasan_dir/$module.a $bp_path
+  done
+else
+  if [[ ! -f "$bp_org_path" ]]; then
+    echo Nothing to restore. Try without the \"restore\" option.
+    exit 1
+  fi
+  mv -f $bp_org_path $bp_path
+  echo "$bp_path" restored
+fi
+
+exit