setup.sh

#!/bin/bash

# Options
ARCH=$(echo "${RUNNER_ARCH:-x64}" | awk '{print tolower($0)}')
OS=$(echo "${RUNNER_OS:-linux}" | awk '{print tolower($0)}')

# Args
FLUTTER_VERSION=${1:-3.0.2}
FLUTTER_CHANNEL=${2:-stable}
FLUTTER_OS=$OS

# Detect the latest version
if [[ $FLUTTER_VERSION == "latest" ]]
then
        echo "Detecting latest version..."
        curl -L https://storage.googleapis.com/flutter_infra_release/releases/releases_$OS.json -o "${RUNNER_TEMP}/flutter_release.json"
        CURRENT_RELEASE=$(jq -r ".current_release.${FLUTTER_CHANNEL}" "${RUNNER_TEMP}/flutter_release.json")
        FLUTTER_VERSION=$(jq -r ".releases | map(select(.hash == \"${CURRENT_RELEASE}\")) | .[0].version" "${RUNNER_TEMP}/flutter_release.json")
        rm "${RUNNER_TEMP}/flutter_release.json"
fi

# OS archive file extension
EXT="zip"
if [[ $OS == linux ]]
then
	EXT="tar.xz"
fi

# Apple Intel or Apple Silicon
if [[ $OS == macos && $ARCH == 'arm64' && $FLUTTER_VERSION == 3.* ]]
then
	FLUTTER_OS="${FLUTTER_OS}_$ARCH"
fi

# Flutter runner tool cache
# path: "${{ runner.tool_cache }}/flutter-${{ runner.os }}-${{ inputs.version }}-${{ runner.arch }}"
# key: flutter-action-setup-flutter-${{ runner.os }}-${{ inputs.version }}-${{ runner.arch }}
FLUTTER_RUNNER_TOOL_CACHE="${RUNNER_TOOL_CACHE}/flutter-${RUNNER_OS}-${FLUTTER_VERSION}-${RUNNER_ARCH}"

# Check if Flutter SDK already exists
# Otherwise download and install
# https://storage.googleapis.com/flutter_infra_release/releases/stable/macos/flutter_macos_arm64_3.0.2-stable.zip
FLUTTER_RELEASE_URL="https://storage.googleapis.com/flutter_infra_release/releases"


if [ ! -d "${FLUTTER_RUNNER_TOOL_CACHE}" ]; then
	echo "Installing Flutter SDK version \"${FLUTTER_VERSION}\" from the ${FLUTTER_CHANNEL} channel on ${FLUTTER_OS}"

	# Linux
	# /stable    /linux/     flutter_linux_2.10.2-stable.tar.xz
	# /beta      /linux/     flutter_linux_3.1.0-9.0.pre-beta.tar.xz

	# macOS
	# /stable    /macos/     flutter_macos_3.0.2-stable.zip
	# /stable    /macos/     flutter_macos_arm64_3.0.2-stable.zip
	# /beta      /macos/     flutter_macos_arm64_3.1.0-9.0.pre-beta.zip
	# /beta      /macos/     flutter_macos_3.1.0-9.0.pre-beta.zip

	# Windows
	# /stable    /windows/   flutter_windows_3.0.2-stable.zip
	# /beta      /windows/   flutter_windows_3.1.0-9.0.pre-beta.zip
	FLUTTER_BUILD="flutter_${FLUTTER_OS}_${FLUTTER_VERSION}-${FLUTTER_CHANNEL}.${EXT}"
	FLUTTER_DOWNLOAD_URL="${FLUTTER_RELEASE_URL}/${FLUTTER_CHANNEL}/${FLUTTER_OS}/${FLUTTER_BUILD}"

	echo "Downloading ${FLUTTER_DOWNLOAD_URL}"

	# Download installation archive
	DOWNLOAD_PATH="/tmp/${FLUTTER_BUILD}"
	curl --connect-timeout 15 --retry 5 "$FLUTTER_DOWNLOAD_URL" > ${DOWNLOAD_PATH}

	# Prepare tool cache folder
	mkdir -p "${FLUTTER_RUNNER_TOOL_CACHE}"

	# Extracting installation archive
	if [[ $OS == linux ]]
	then
		tar -C "${FLUTTER_RUNNER_TOOL_CACHE}" -xf ${DOWNLOAD_PATH} > /dev/null
	else
		unzip ${DOWNLOAD_PATH} -d "${FLUTTER_RUNNER_TOOL_CACHE}" > /dev/null
	fi

	if [ $? -ne 0 ]; then
		echo -e "::error::Download failed! Please check passed arguments."
		exit 1
	fi
else
	echo "Cache restored Flutter SDK version \"${FLUTTER_VERSION}\" from the ${FLUTTER_CHANNEL} channel on ${FLUTTER_OS}"
fi

# Configure pub to use a fixed location.
echo "PUB_CACHE=${HOME}/.pub-cache" >> $GITHUB_ENV

# Update paths.
echo "${HOME}/.pub-cache/bin" >> $GITHUB_PATH
echo "${FLUTTER_RUNNER_TOOL_CACHE}/flutter/bin" >> $GITHUB_PATH

# Report success, and print version.
echo -e "Succesfully installed Flutter SDK:"
${FLUTTER_RUNNER_TOOL_CACHE}/flutter/bin/dart --version
${FLUTTER_RUNNER_TOOL_CACHE}/flutter/bin/flutter --version