scripts/sync_engine_artifacts_to_revision.sh

#!/bin/bash
#
# Copyright 2022 The Fuchsia Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
#
# Syncs the Flutter Engine artifacts in this repository to artifacts built
# at a specified commit. Cherry-picks in several fixes that are necessary
# for the embedder to work currently.
#
# Usage:
#   sync_engine_artifacts_to_commit.sh <engine_commit>
#
# Requirements:
#   1. $ENGINE_DIR is set to the src/ directory of your flutter/engine checkout.
#   2. $FUCHSIA_EMBEDDER_DIR is set to your flutter-embedder.git checkout.
#   3. $DEPOT_TOOLS is set to your depot_tools directory.
#   4. You don't have any uncommited changes to your Engine code.

set -e # Fail on any error.
source "$(cd "$(dirname "${BASH_SOURCE[0]}")" >/dev/null 2>&1 && pwd)"/lib/echo_helpers.sh || exit $?

engine_revision=$1

function get_engine_fix() {
  user=$1
  fix=$2
  reason=$3

  if ! git merge-base --is-ancestor "${fix}" HEAD
  then
    echo-info "Cherry-picking https://github.com/$user/engine/commit/${fix} into ${ENGINE_DIR}/flutter ${reason}"

    git remote add "${user}" "https://github.com/${user}/engine" || true # since this will error if the remote was already added
    git fetch "${user}"
    git cherry-pick -c "${fix}"
  fi
}

pushd "${ENGINE_DIR}"

# Sync Flutter to specified revision.
echo-info "Syncing ${ENGINE_DIR}/flutter to ${engine_revision}..."
pushd flutter
git fetch upstream
git checkout "${engine_revision}"
popd  # flutter

echo-info "Syncing ${ENGINE_DIR} dependencies..."
gclient sync -D

# Get buildroot fix.
# TODO(akbiggs): Submit this fix.
buildroot_fix=c7deba3773ed645c29f4518cc3990bc02f0f53cd
pushd build
if ! git merge-base --is-ancestor "${buildroot_fix}" HEAD
then
  echo-info "Cherry-picking https://github.com/akbiggs/buildroot/commit/${buildroot_fix} into ${ENGINE_DIR}/build to fix embedder build for Fuchsia..."

  git remote add akbiggs https://github.com/akbiggs/buildroot || true # since this will error if the remote was already added
  git fetch akbiggs
  git cherry-pick -c "${buildroot_fix}"
fi
popd  # build

pushd flutter

# TODO(akbiggs): Submit these Flutter Engine fixes.
jit_snapshot_fix=d79531e15a1b04d5e68c7ad87775cb594727d7b0
get_engine_fix "akbiggs" "${jit_snapshot_fix}" "to work around JIT snapshot loading issue..."

inspect_node_fix=3cbcbb20321f6cda60d28ebc8c2e0b2da285a58d
get_engine_fix "akbiggs" "${inspect_node_fix}" "to set Dart VM inspect node for Fuchsia..."

acquire_software_surface_fix=dadf7a7b06b60f36fdce66759bfd74c01d74e27b
get_engine_fix "akbiggs" "${acquire_software_surface_fix}" "to get API for acquiring software surface..."

font_initialization_data_fix=2aa6de94a2d16a50982b0b8ab5a09fa4bc0443b5
get_engine_fix "naudzghebre" "${font_initialization_data_fix}" "to get API change to embedder.h for setting font_initialization_data.."

popd  # flutter

# Build and copy over the artifacts we need and update our
# revision.
"${FUCHSIA_EMBEDDER_DIR}"/scripts/build_and_copy_engine_artifacts.sh
echo "${engine_revision}" > "${FUCHSIA_EMBEDDER_DIR}"/src/embedder/engine/engine_revision

echo-info "Done! Engine artifacts updated to ${engine_revision}."
popd  # ${ENGINE_DIR}