Flutter libimpeller downloader

get_impeller_binaries.sh

#!/usr/bin/env sh

# set traps so it errors out on any error
set -euo pipefail
# Get the directory where the script is located
SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"

# Get the parent directory of the script
PARENT_DIR="$(dirname "$SCRIPT_DIR")"

# Now PARENT_DIR contains the parent directory path
echo "Script is in: $SCRIPT_DIR"
echo "Parent directory is: $PARENT_DIR"

DOWNLOAD_DIR="$PARENT_DIR/downloaded_binaries"

# curl https://storage.googleapis.com/flutter_infra_release/flutter/$FLUTTER_ENGINE_SHA/$PLATFORM_ARCH/impeller_sdk.zip
FLUTTER_GIT_ROOT="/LOCAL/PATH/TO/FLUTTER/"

# 1. cd to flutter git root, checkout stable branch
# and cat <flutter-dir>/bin/internal/engine.version
# cd $FLUTTER_GIT_ROOT
git -C "$FLUTTER_GIT_ROOT" checkout stable
FLUTTER_ENGINE_SHA=$(cat "$FLUTTER_GIT_ROOT"/bin/internal/engine.version)

echo "Using latest stable SHA: $FLUTTER_ENGINE_SHA"

PLATFORM_ARCHES="darwin-arm64 darwin-x64 linux-arm64 linux-x64 windows-x64 windows-arm64"
# FLUTTER_ENGINE_REPO_URL="https://github.com/flutter/engine.git"
BASE_URL="https://storage.googleapis.com/flutter_infra_release/flutter"

# 2. for each platform arch, download the impeller_sdk.zip
for PLATFORM_ARCH in $PLATFORM_ARCHES; do
  echo "Downloading impeller_sdk.zip for $PLATFORM_ARCH SHA $FLUTTER_ENGINE_SHA"
  echo "URL: $BASE_URL/$FLUTTER_ENGINE_SHA/$PLATFORM_ARCH/impeller_sdk.zip"
  download_path="$DOWNLOAD_DIR/impeller_sdk-$PLATFORM_ARCH-$FLUTTER_ENGINE_SHA.zip"
  echo "Local download path: $download_path"
  curl $BASE_URL/$FLUTTER_ENGINE_SHA/$PLATFORM_ARCH/impeller_sdk.zip -o $download_path
done