diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..c536645
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,21 @@
+The MIT License (MIT)
+
+Copyright (c) 2019 Alif Rachmawadi <arch@subosito.com>
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..b49781f
--- /dev/null
+++ b/README.md
@@ -0,0 +1,315 @@
+# flutter-action
+
+Flutter environment for use in GitHub Actions. It works on Linux, Windows, and
+macOS.
+
+The following sections show how to configure this action.
+
+## Specifying Flutter version
+
+### Use specific version and channel
+
+```yaml
+steps:
+  - name: Clone repository
+    uses: actions/checkout@v4
+  - name: Set up Flutter
+    uses: subosito/flutter-action@v2
+    with:
+      channel: stable
+      flutter-version: 3.19.0
+  - run: flutter --version
+```
+
+### Use version from pubspec.yaml
+
+This is inspired by [`actions/setup-go`](https://github.com/actions/setup-go).
+
+```yaml
+steps:
+  - name: Clone repository
+    uses: actions/checkout@v4
+  - name: Set up Flutter
+    uses: subosito/flutter-action@v2
+    with:
+      channel: stable
+      flutter-version-file: pubspec.yaml # path to pubspec.yaml
+  - run: flutter --version
+```
+
+> [!IMPORTANT]
+>
+> For `flutter-version-file` to work, you need to have the exact Flutter version
+> defined in your pubspec.yaml:
+>
+> **Good**
+>
+> ```yaml
+> environment:
+>   sdk: ">=3.3.0 <4.0.0"
+>   flutter: 3.19.0
+> ```
+>
+> **Bad**
+>
+> ```yaml
+> environment:
+>   sdk: ">=3.3.0 <4.0.0"
+>   flutter: ">= 3.19.0 <4.0.0"
+> ```
+
+> [!WARNING]
+>
+> Using `flutter-version-file` requires [`yq`](https://github.com/mikefarah/yq),
+> which is not pre-installed in `windows` images. Install it yourself.
+
+### Use latest release for particular channel
+
+```yaml
+steps:
+  - name: Clone repository
+    uses: actions/checkout@v4
+  - name: Set up Flutter
+    uses: subosito/flutter-action@v2
+    with:
+      channel: stable # or: beta, master (or main)
+  - run: flutter --version
+```
+
+### Use latest release for particular version and/or channel
+
+```yaml
+steps:
+  - name: Clone repository
+    uses: actions/checkout@v4
+  - name: Set up Flutter
+    uses: subosito/flutter-action@v2
+    with:
+      channel: dev
+      flutter-version: 1.22.x
+  - run: flutter --version
+```
+
+### Use particular version on any channel
+
+```yaml
+steps:
+  - name: Clone repository
+    uses: actions/checkout@v4
+  - name: Set up Flutter
+    uses: subosito/flutter-action@v2
+    with:
+      channel: any
+      flutter-version: 3.x
+  - run: flutter --version
+```
+
+### Use particular git reference on master channel
+
+```yaml
+steps:
+  - name: Clone repository
+    uses: actions/checkout@v4
+  - name: Set up Flutter
+    uses: subosito/flutter-action@v2
+    with:
+      channel: master
+      flutter-version: 5b12b74 # tag, commit or branch
+  - run: flutter --version
+```
+
+## Build Target
+
+Build **Android** APK and app bundle:
+
+```yaml
+steps:
+  - name: Clone repository
+    uses: actions/checkout@v4
+  - name: Set up Flutter
+    uses: subosito/flutter-action@v2
+    with:
+      flutter-version: 3.19.0
+  - run: flutter pub get
+  - run: flutter test
+  - run: flutter build apk
+  - run: flutter build appbundle
+```
+
+### Build for iOS
+
+> [!NOTE]
+>
+> Building for iOS requires a macOS runner.
+
+```yaml
+jobs:
+  main:
+    runs-on: macos-latest
+    steps:
+      - name: Clone repository
+        uses: actions/checkout@v4
+      - name: Set up Flutter
+        uses: subosito/flutter-action@v2
+        with:
+          channel: stable
+      - run: flutter pub get
+      - run: flutter test
+      - run: flutter build ios --release --no-codesign
+```
+
+### Build for the web
+
+```yaml
+steps:
+  - name: Clone repository
+    uses: actions/checkout@v4
+  - name: Set up Flutter
+    uses: subosito/flutter-action@v2
+    with:
+      channel: stable
+  - run: flutter pub get
+  - run: flutter test
+  - run: flutter build web
+```
+
+### Build for Windows
+
+```yaml
+jobs:
+  main:
+    runs-on: windows-latest
+    steps:
+      - name: Clone repository
+        uses: actions/checkout@v4
+      - name: Set up Flutter
+        uses: subosito/flutter-action@v2
+        with:
+          channel: stable
+      - run: flutter build windows
+```
+
+### Build for Linux desktop
+
+```yaml
+jobs:
+  main:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Clone repository
+        uses: actions/checkout@v4
+      - name: Set up Flutter
+        uses: subosito/flutter-action@v2
+        with:
+          channel: stable
+      - run: |
+          sudo apt-get update -y
+          sudo apt-get install -y ninja-build libgtk-3-dev
+      - run: flutter build linux
+```
+
+### Build for macOS desktop
+
+> [!NOTE]
+>
+> Building for macOS requires a macOS runner.
+
+```yaml
+jobs:
+  main:
+    runs-on: macos-latest
+    steps:
+      - name: Clone repository
+        uses: actions/checkout@v4
+      - name: Set up Flutter
+        uses: subosito/flutter-action@v2
+        with:
+          channel: stable
+      - run: flutter build macos
+```
+
+## Caching
+
+Integration with [`actions/cache`](https://github.com/actions/cache):
+
+```yaml
+steps:
+  - name: Clone repository
+    uses: actions/checkout@v4
+  - name: Set up Flutter
+    uses: subosito/flutter-action@v2
+    with:
+      channel: stable
+      cache: true
+      # optional parameters follow
+      cache-key: "flutter-:os:-:channel:-:version:-:arch:-:hash:" # optional, change this to force refresh cache
+      cache-path: "${{ runner.tool_cache }}/flutter/:channel:-:version:-:arch:" # optional, change this to specify the cache path
+      pub-cache-key: "flutter-pub:os:-:channel:-:version:-:arch:-:hash:" # optional, change this to force refresh cache of dart pub get dependencies
+      pub-cache-path: "${{ runner.tool_cache }}/flutter/:channel:-:version:-:arch:" # optional, change this to specify the cache path
+  - run: flutter --version
+```
+
+Note: `cache-key`, `pub-cache-key`, and `cache-path` have support for several
+dynamic values:
+
+- `:os:`
+- `:channel:`
+- `:version:`
+- `:arch:`
+- `:hash:`
+- `:sha256:`
+
+Use outputs from `flutter-action`:
+
+```yaml
+steps:
+  - name: Clone repository
+  - uses: actions/checkout@v4
+  - name: Set up Flutter
+    uses: subosito/flutter-action@v2
+    id: flutter-action
+    with:
+      channel: stable
+  - name: Print outputs
+    shell: bash
+    run: |
+      echo CACHE-PATH=${{ steps.flutter-action.outputs.CACHE-PATH }}
+      echo CACHE-KEY=${{ steps.flutter-action.outputs.CACHE-KEY }}
+      echo CHANNEL=${{ steps.flutter-action.outputs.CHANNEL }}
+      echo VERSION=${{ steps.flutter-action.outputs.VERSION }}
+      echo ARCHITECTURE=${{ steps.flutter-action.outputs.ARCHITECTURE }}
+      echo PUB-CACHE-PATH=${{ steps.flutter-action.outputs.PUB-CACHE-PATH }}
+      echo PUB-CACHE-KEY=${{ steps.flutter-action.outputs.PUB-CACHE-KEY }}
+```
+
+If you don't need to install Flutter and just want the outputs, you can use the
+`dry-run` option:
+
+```yaml
+steps:
+  - name: Clone repository
+  - uses: actions/checkout@v4
+  - name: Set up Flutter
+    uses: subosito/flutter-action@v2
+    id: flutter-action
+    with:
+      channel: stable
+      dry-run: true
+  - run: |
+      echo CACHE-PATH=${{ steps.flutter-action.outputs.CACHE-PATH }}
+      echo CACHE-KEY=${{ steps.flutter-action.outputs.CACHE-KEY }}
+      echo CHANNEL=${{ steps.flutter-action.outputs.CHANNEL }}
+      echo VERSION=${{ steps.flutter-action.outputs.VERSION }}
+      echo ARCHITECTURE=${{ steps.flutter-action.outputs.ARCHITECTURE }}
+      echo PUB-CACHE-PATH=${{ steps.flutter-action.outputs.PUB-CACHE-PATH }}
+      echo PUB-CACHE-KEY=${{ steps.flutter-action.outputs.PUB-CACHE-KEY }}
+    shell: bash
+```
+
+## Maintainers
+
+- [Alif Rachmawadi] (original creator)
+- [Bartek Pacia]
+
+[Alif Rachmawadi]: https://github.com/subosito
+[Bartek Pacia]: https://github.com/bartekpacia
diff --git a/action.yaml b/action.yaml
new file mode 100644
index 0000000..73774f4
--- /dev/null
+++ b/action.yaml
@@ -0,0 +1,121 @@
+name: Set up Flutter
+description: Setup your runner with Flutter environment
+author: Alif Rachmawadi
+branding:
+  icon: maximize
+  color: blue
+
+inputs:
+  channel:
+    description: The Flutter build release channel
+    required: false
+    default: stable
+  flutter-version:
+    description: The Flutter version to make available on the path
+    required: false
+    default: ""
+  flutter-version-file:
+    description: The pubspec.yaml file with exact Flutter version defined
+    required: false
+    default: ""
+  architecture:
+    description: The architecture of Flutter SDK executable (x64 or arm64)
+    required: false
+    default: "${{ runner.arch }}"
+  cache:
+    description: Cache the Flutter SDK
+    required: false
+    default: "false"
+  cache-key:
+    description: Identifier for the Flutter SDK cache
+    required: false
+    default: ""
+  cache-path:
+    description: Flutter SDK cache path
+    required: false
+    default: ""
+  pub-cache-key:
+    description: Identifier for the Dart .pub-cache cache
+    required: false
+    default: ""
+  pub-cache-path:
+    description: Flutter pub cache path
+    required: false
+    default: default
+  dry-run:
+    description: If true, get outputs but do not install Flutter
+    required: false
+    default: "false"
+
+outputs:
+  CHANNEL:
+    value: "${{ steps.flutter-action.outputs.CHANNEL }}"
+    description: The selected Flutter release channel
+  VERSION:
+    value: "${{ steps.flutter-action.outputs.VERSION }}"
+    description: The selected Flutter version
+  ARCHITECTURE:
+    value: "${{ steps.flutter-action.outputs.ARCHITECTURE }}"
+    description: The selected Flutter CPU architecture
+  CACHE-KEY:
+    value: "${{ steps.flutter-action.outputs.CACHE-KEY }}"
+    description: Key used to cache the Flutter SDK
+  CACHE-PATH:
+    value: "${{ steps.flutter-action.outputs.CACHE-PATH }}"
+    description: Path to Flutter SDK
+  PUB-CACHE-KEY:
+    value: "${{ steps.flutter-action.outputs.PUB-CACHE-KEY }}"
+    description: Key used to cache the pub dependencies
+  PUB-CACHE-PATH:
+    value: "${{ steps.flutter-action.outputs.PUB-CACHE-PATH }}"
+    description: Path to pub cache
+
+runs:
+  using: composite
+  steps:
+    - name: Make setup script executable
+      run: chmod +x "$GITHUB_ACTION_PATH/setup.sh"
+      shell: bash
+
+    - name: Set action inputs
+      id: flutter-action
+      shell: bash
+      run: |
+        $GITHUB_ACTION_PATH/setup.sh -p \
+          -n '${{ inputs.flutter-version }}' \
+          -f '${{ inputs.flutter-version-file }}' \
+          -a '${{ inputs.architecture }}' \
+          -k '${{ inputs.cache-key }}' \
+          -c '${{ inputs.cache-path }}' \
+          -l '${{ inputs.pub-cache-key }}' \
+          -d '${{ inputs.pub-cache-path }}' \
+          ${{ inputs.channel }}
+
+    - name: Cache Flutter
+      uses: actions/cache@v4
+      if: ${{ inputs.cache == 'true' }}
+      with:
+        path: ${{ steps.flutter-action.outputs.CACHE-PATH }}
+        key: ${{ steps.flutter-action.outputs.CACHE-KEY }}
+        restore-keys: |
+          ${{ steps.flutter-action.outputs.CACHE-KEY }}
+
+    - name: Cache pub dependencies
+      uses: actions/cache@v4
+      if: ${{ inputs.cache == 'true' }}
+      with:
+        path: ${{ steps.flutter-action.outputs.PUB-CACHE-PATH }}
+        key: ${{ steps.flutter-action.outputs.PUB-CACHE-KEY }}-${{ hashFiles('**/pubspec.lock') }}
+        restore-keys: |
+          ${{ steps.flutter-action.outputs.PUB-CACHE-KEY }}-${{ hashFiles('**/pubspec.lock') }}
+          ${{ steps.flutter-action.outputs.PUB-CACHE-KEY }}
+
+    - name: Run setup script
+      shell: bash
+      if: ${{ inputs.dry-run != 'true' }}
+      run: |
+        $GITHUB_ACTION_PATH/setup.sh \
+          -n '${{ steps.flutter-action.outputs.VERSION }}' \
+          -a '${{ steps.flutter-action.outputs.ARCHITECTURE }}' \
+          -c '${{ steps.flutter-action.outputs.CACHE-PATH }}' \
+          ${{ steps.flutter-action.outputs.CHANNEL }}
diff --git a/setup.sh b/setup.sh
new file mode 100644
index 0000000..9cce2cc
--- /dev/null
+++ b/setup.sh
@@ -0,0 +1,236 @@
+#!/bin/bash
+set -eu
+
+check_command() {
+	command -v "$1" >/dev/null 2>&1
+}
+
+if ! check_command jq; then
+	echo "jq not found. Install it from https://stedolan.github.io/jq"
+	exit 1
+fi
+
+OS_NAME=$(echo "$RUNNER_OS" | awk '{print tolower($0)}')
+ARCH_NAME=$(echo "$RUNNER_ARCH" | awk '{print tolower($0)}')
+MANIFEST_BASE_URL="https://storage.googleapis.com/flutter_infra_release/releases"
+MANIFEST_JSON_PATH="releases_$OS_NAME.json"
+MANIFEST_URL="$MANIFEST_BASE_URL/$MANIFEST_JSON_PATH"
+
+filter_by_channel() {
+	jq --arg channel "$1" '[.releases[] | select($channel == "any" or .channel == $channel)]'
+}
+
+filter_by_arch() {
+	jq --arg arch "$1" '[.[] | select(.dart_sdk_arch == $arch or ($arch == "x64" and (has("dart_sdk_arch") | not)))]'
+}
+
+filter_by_version() {
+	jq --arg version "$1" '.[].version |= gsub("^v"; "") | (if $version == "any" then .[0] else (map(select(.version == $version or (.version | startswith(($version | sub("\\.x$"; "")) + ".")) and .version != $version)) | .[0]) end)'
+}
+
+not_found_error() {
+	echo "Unable to determine Flutter version for channel: $1 version: $2 architecture: $3"
+}
+
+transform_path() {
+	if [ "$OS_NAME" = windows ]; then
+		echo "$1" | sed -e 's/^\///' -e 's/\//\\/g'
+	else
+		echo "$1"
+	fi
+}
+
+download_archive() {
+	archive_url="$MANIFEST_BASE_URL/$1"
+	archive_name=$(basename "$1")
+	archive_local="$RUNNER_TEMP/$archive_name"
+
+	curl --connect-timeout 15 --retry 5 "$archive_url" >"$archive_local"
+
+	mkdir -p "$2"
+
+	case "$archive_name" in
+	*.zip)
+		EXTRACT_PATH="$RUNNER_TEMP/_unzip_temp"
+		unzip -q -o "$archive_local" -d "$EXTRACT_PATH"
+		# Remove the folder again so that the move command can do a simple rename
+		# instead of moving the content into the target folder.
+		# This is a little bit of a hack since the "mv --no-target-directory"
+		# linux option is not available here
+		rm -r "$2"
+		mv "$EXTRACT_PATH"/flutter "$2"
+		rm -r "$EXTRACT_PATH"
+		;;
+	*)
+		tar xf "$archive_local" -C "$2" --strip-components=1
+		;;
+	esac
+
+	rm "$archive_local"
+}
+
+CACHE_PATH=""
+CACHE_KEY=""
+PUB_CACHE_PATH=""
+PUB_CACHE_KEY=""
+PRINT_ONLY=""
+TEST_MODE=false
+ARCH=""
+VERSION=""
+VERSION_FILE=""
+
+while getopts 'tc:k:d:l:pa:n:f:' flag; do
+	case "$flag" in
+	c) CACHE_PATH="$OPTARG" ;;
+	k) CACHE_KEY="$OPTARG" ;;
+	d) PUB_CACHE_PATH="$OPTARG" ;;
+	l) PUB_CACHE_KEY="$OPTARG" ;;
+	p) PRINT_ONLY=true ;;
+	t) TEST_MODE=true ;;
+	a) ARCH="$(echo "$OPTARG" | awk '{print tolower($0)}')" ;;
+	n) VERSION="$OPTARG" ;;
+	f)
+		VERSION_FILE="$OPTARG"
+		if [ -n "$VERSION_FILE" ] && ! check_command yq; then
+			echo "yq not found. Install it from https://mikefarah.gitbook.io/yq"
+			exit 1
+		fi
+		;;
+	?) exit 2 ;;
+	esac
+done
+
+[ -z "$ARCH" ] && ARCH="$ARCH_NAME"
+
+if [ -n "$VERSION_FILE" ]; then
+	if [ -n "$VERSION" ]; then
+		echo "Cannot specify both a version and a version file"
+		exit 1
+	fi
+
+	VERSION="$(yq '.environment.flutter' "$VERSION_FILE")"
+fi
+
+ARR_CHANNEL=("${@:$OPTIND:1}")
+CHANNEL="${ARR_CHANNEL[0]:-}"
+
+[ -z "$CHANNEL" ] && CHANNEL=stable
+[ -z "$VERSION" ] && VERSION=any
+[ -z "$ARCH" ] && ARCH=x64
+[ -z "$CACHE_PATH" ] && CACHE_PATH="$RUNNER_TOOL_CACHE/flutter/:channel:-:version:-:arch:"
+[ -z "$CACHE_KEY" ] && CACHE_KEY="flutter-:os:-:channel:-:version:-:arch:-:hash:"
+[ -z "$PUB_CACHE_KEY" ] && PUB_CACHE_KEY="flutter-pub-:os:-:channel:-:version:-:arch:-:hash:"
+[ -z "$PUB_CACHE_PATH" ] && PUB_CACHE_PATH="default"
+
+# `PUB_CACHE` is what Dart and Flutter looks for in the environment, while
+# `PUB_CACHE_PATH` is passed in from the action.
+#
+# If `PUB_CACHE` is set already, then it should continue to be used. Otherwise, satisfy it
+# if the action requests a custom path, or set to the Dart default values depending
+# on the operating system.
+if [ -z "${PUB_CACHE:-}" ]; then
+	if [ "$PUB_CACHE_PATH" != "default" ]; then
+		PUB_CACHE="$PUB_CACHE_PATH"
+	elif [ "$OS_NAME" = "windows" ]; then
+		PUB_CACHE="$LOCALAPPDATA\\Pub\\Cache"
+	else
+		PUB_CACHE="$HOME/.pub-cache"
+	fi
+fi
+
+if [ "$TEST_MODE" = true ]; then
+	RELEASE_MANIFEST=$(cat "$(dirname -- "${BASH_SOURCE[0]}")/test/$MANIFEST_JSON_PATH")
+else
+	RELEASE_MANIFEST=$(curl --silent --connect-timeout 15 --retry 5 "$MANIFEST_URL")
+fi
+
+if [ "$CHANNEL" = "master" ] || [ "$CHANNEL" = "main" ]; then
+	VERSION_MANIFEST="{\"channel\":\"$CHANNEL\",\"version\":\"$VERSION\",\"dart_sdk_arch\":\"$ARCH\",\"hash\":\"$CHANNEL\",\"sha256\":\"$CHANNEL\"}"
+else
+	VERSION_MANIFEST=$(echo "$RELEASE_MANIFEST" | filter_by_channel "$CHANNEL" | filter_by_arch "$ARCH" | filter_by_version "$VERSION")
+fi
+
+case "$VERSION_MANIFEST" in
+*null*)
+	not_found_error "$CHANNEL" "$VERSION" "$ARCH"
+	exit 1
+	;;
+esac
+
+expand_key() {
+	version_channel=$(echo "$VERSION_MANIFEST" | jq -r '.channel')
+	version_version=$(echo "$VERSION_MANIFEST" | jq -r '.version')
+	version_arch=$(echo "$VERSION_MANIFEST" | jq -r '.dart_sdk_arch // "x64"')
+	version_hash=$(echo "$VERSION_MANIFEST" | jq -r '.hash')
+	version_sha_256=$(echo "$VERSION_MANIFEST" | jq -r '.sha256')
+
+	expanded_key="${1/:channel:/$version_channel}"
+	expanded_key="${expanded_key/:version:/$version_version}"
+	expanded_key="${expanded_key/:arch:/$version_arch}"
+	expanded_key="${expanded_key/:hash:/$version_hash}"
+	expanded_key="${expanded_key/:sha256:/$version_sha_256}"
+	expanded_key="${expanded_key/:os:/$OS_NAME}"
+
+	echo "$expanded_key"
+}
+
+CACHE_KEY=$(expand_key "$CACHE_KEY")
+PUB_CACHE_KEY=$(expand_key "$PUB_CACHE_KEY")
+CACHE_PATH=$(expand_key "$(transform_path "$CACHE_PATH")")
+
+if [ "$PRINT_ONLY" = true ]; then
+	version_info=$(echo "$VERSION_MANIFEST" | jq -j '.channel,":",.version,":",.dart_sdk_arch // "x64"')
+
+	info_channel=$(echo "$version_info" | awk -F ':' '{print $1}')
+	info_version=$(echo "$version_info" | awk -F ':' '{print $2}')
+	info_architecture=$(echo "$version_info" | awk -F ':' '{print $3}')
+
+	if [ "$TEST_MODE" = true ]; then
+		echo "CHANNEL=$info_channel"
+		echo "VERSION=$info_version"
+		# VERSION_FILE is not printed, because it is essentially same as VERSION
+		echo "ARCHITECTURE=$info_architecture"
+		echo "CACHE-KEY=$CACHE_KEY"
+		echo "CACHE-PATH=$CACHE_PATH"
+		echo "PUB-CACHE-KEY=$PUB_CACHE_KEY"
+		echo "PUB-CACHE-PATH=$PUB_CACHE"
+		exit 0
+	fi
+
+	{
+		echo "CHANNEL=$info_channel"
+		echo "VERSION=$info_version"
+		# VERSION_FILE is not printed, because it is essentially same as VERSION
+		echo "ARCHITECTURE=$info_architecture"
+		echo "CACHE-KEY=$CACHE_KEY"
+		echo "CACHE-PATH=$CACHE_PATH"
+		echo "PUB-CACHE-KEY=$PUB_CACHE_KEY"
+		echo "PUB-CACHE-PATH=$PUB_CACHE"
+	} >>"${GITHUB_OUTPUT:-/dev/null}"
+
+	exit 0
+fi
+
+if [ ! -x "$CACHE_PATH/bin/flutter" ]; then
+	if [ "$CHANNEL" = "master" ] || [ "$CHANNEL" = "main" ]; then
+		git clone -b "$CHANNEL" https://github.com/flutter/flutter.git "$CACHE_PATH"
+		if [ "$VERSION" != "any" ]; then
+			git config --global --add safe.directory "$CACHE_PATH"
+			(cd "$CACHE_PATH" && git checkout "$VERSION")
+		fi
+	else
+		archive_url=$(echo "$VERSION_MANIFEST" | jq -r '.archive')
+		download_archive "$archive_url" "$CACHE_PATH"
+	fi
+fi
+
+{
+	echo "FLUTTER_ROOT=$CACHE_PATH"
+	echo "PUB_CACHE=$PUB_CACHE"
+} >>"${GITHUB_ENV:-/dev/null}"
+
+{
+	echo "$CACHE_PATH/bin"
+	echo "$CACHE_PATH/bin/cache/dart-sdk/bin"
+	echo "$PUB_CACHE/bin"
+} >>"${GITHUB_PATH:-/dev/null}"