diff --git a/.github/workflows/workflow.yml b/.github/workflows/workflow.yml
index aedbd62..4174ccf 100644
--- a/.github/workflows/workflow.yml
+++ b/.github/workflows/workflow.yml
@@ -4,9 +4,15 @@ on:
     branches:
       - main
   pull_request:
-    branches:
-      - main
+    paths:
+      - setup.sh
+      - action.yml
 jobs:
+  lint_shellcheck:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v3
+    - uses: ludeeus/action-shellcheck@master
   test_channel:
     runs-on: ${{ matrix.operating-system }}
     strategy:
diff --git a/setup.sh b/setup.sh
index b99dae5..e72f7e9 100755
--- a/setup.sh
+++ b/setup.sh
@@ -2,130 +2,130 @@
 
 OS_NAME=$(echo "$RUNNER_OS" | awk '{print tolower($0)}')
 MANIFEST_BASE_URL="https://storage.googleapis.com/flutter_infra_release/releases"
-MANIFEST_URL="${MANIFEST_BASE_URL}/releases_${OS_NAME}.json"
-MANIFEST_TEST_PATH="test/releases_${OS_NAME}.json"
+MANIFEST_URL="$MANIFEST_BASE_URL/releases_$OS_NAME.json"
+MANIFEST_TEST_PATH="test/releases_$OS_NAME.json"
 RELEASE_MANIFEST=""
 VERSION_MANIFEST=null
 
 # convert version like 2.5.x to 2.5
 normalize_version() {
-  if [[ $1 == *.x ]]; then
-    echo "${1/.x/}"
-  else
-    echo "$1"
-  fi
+	if [[ $1 == *.x ]]; then
+		echo "${1/.x/}"
+	else
+		echo "$1"
+	fi
 }
 
 latest_version() {
-  jq --arg arch "$ARCH" '.releases | map(select(.dart_sdk_arch == null or .dart_sdk_arch == $arch)) | first'
+	jq --arg arch "$ARCH" '.releases | map(select(.dart_sdk_arch == null or .dart_sdk_arch == $arch)) | first'
 }
 
 latest_channel_version() {
-  jq --arg channel "$1" --arg arch "$ARCH" '.releases | map(select(.channel==$channel) | select(.dart_sdk_arch == null or .dart_sdk_arch == $arch)) | first'
+	jq --arg channel "$1" --arg arch "$ARCH" '.releases | map(select(.channel==$channel) | select(.dart_sdk_arch == null or .dart_sdk_arch == $arch)) | first'
 }
 
 wildcard_version() {
-  if [[ $2 == *"v"* ]]; then  # is legacy version format
-    if [[ $1 == any ]]; then
-    jq --arg version "$2" '.releases | map(select(.version | startswith($version) )) | first'
-    else
-    jq --arg channel "$1" --arg version "$2" '.releases | map(select(.channel==$channel) | select(.version | startswith($version) )) | first'
-    fi
-  elif [[ $1 == any ]]; then
-    jq --arg version "$2" --arg arch "$ARCH" '.releases | map(select(.version | startswith($version)) | select(.dart_sdk_arch == null or .dart_sdk_arch == $arch)) | first'
-  else
-    jq --arg channel "$1" --arg version "$2" --arg arch "$ARCH" '.releases | map(select(.channel==$channel) | select(.version | startswith($version) ) | select(.dart_sdk_arch == null or .dart_sdk_arch == $arch)) | first'
-  fi
+	if [[ $2 == *"v"* ]]; then # is legacy version format
+		if [[ $1 == any ]]; then
+			jq --arg version "$2" '.releases | map(select(.version | startswith($version) )) | first'
+		else
+			jq --arg channel "$1" --arg version "$2" '.releases | map(select(.channel==$channel) | select(.version | startswith($version) )) | first'
+		fi
+	elif [[ $1 == any ]]; then
+		jq --arg version "$2" --arg arch "$ARCH" '.releases | map(select(.version | startswith($version)) | select(.dart_sdk_arch == null or .dart_sdk_arch == $arch)) | first'
+	else
+		jq --arg channel "$1" --arg version "$2" --arg arch "$ARCH" '.releases | map(select(.channel==$channel) | select(.version | startswith($version) ) | select(.dart_sdk_arch == null or .dart_sdk_arch == $arch)) | first'
+	fi
 }
 
 get_version() {
-  if [[ $1 == any && $2 == any ]]; then
-    latest_version
-  elif [[ $2 == any ]]; then
-    latest_channel_version $1
-  else
-    wildcard_version $1 $2
-  fi
+	if [[ $1 == any && $2 == any ]]; then
+		latest_version
+	elif [[ $2 == any ]]; then
+		latest_channel_version "$1"
+	else
+		wildcard_version "$1" "$2"
+	fi
 }
 
 get_version_manifest() {
-  version_manifest=$(echo $RELEASE_MANIFEST | get_version $1 $(normalize_version $2))
+	version_manifest=$(echo "$RELEASE_MANIFEST" | get_version "$1" "$(normalize_version "$2")")
 
-  if [[ $version_manifest == null ]]; then
-    # fallback through legacy version format
-    version_manifest=$(echo "$RELEASE_MANIFEST" | wildcard_version $1 "v$(normalize_version $2)")
-  fi
+	if [[ $version_manifest == null ]]; then
+		# fallback through legacy version format
+		version_manifest=$(echo "$RELEASE_MANIFEST" | wildcard_version "$1" "v$(normalize_version "$2")")
+	fi
 
-  version_arch=$(echo "$version_manifest" | jq -r '.dart_sdk_arch')
+	version_arch=$(echo "$version_manifest" | jq -r '.dart_sdk_arch')
 
-  if [[ "$version_arch" == null ]]; then
-    echo "$version_manifest" | jq --arg dart_sdk_arch x64 '.+={dart_sdk_arch:$dart_sdk_arch}'
-  else
-    echo "$version_manifest"
-  fi
+	if [[ "$version_arch" == null ]]; then
+		echo "$version_manifest" | jq --arg dart_sdk_arch x64 '.+={dart_sdk_arch:$dart_sdk_arch}'
+	else
+		echo "$version_manifest"
+	fi
 }
 
 download_archive() {
-  archive_url="$MANIFEST_BASE_URL/$1"
-  archive_name=$(basename $1)
-  archive_local="$RUNNER_TEMP/$archive_name"
+	archive_url="$MANIFEST_BASE_URL/$1"
+	archive_name=$(basename "$1")
+	archive_local="$RUNNER_TEMP/$archive_name"
 
-  curl --connect-timeout 15 --retry 5 $archive_url >$archive_local
+	curl --connect-timeout 15 --retry 5 "$archive_url" >"$archive_local"
 
-  # Create the target folder
-  mkdir -p "$2"
+	# Create the target folder
+	mkdir -p "$2"
 
-  if [[ $archive_name == *zip ]]; then
-    unzip -q -o "$archive_local" -d "$RUNNER_TEMP"
-    # 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 ${RUNNER_TEMP}/flutter "$2"
-  else
-    tar xf "$archive_local" -C "$2" --strip-components=1
-  fi
+	if [[ $archive_name == *zip ]]; then
+		unzip -q -o "$archive_local" -d "$RUNNER_TEMP"
+		# 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 "$2"
+		mv "$RUNNER_TEMP"/flutter "$2"
+	else
+		tar xf "$archive_local" -C "$2" --strip-components=1
+	fi
 
-  rm $archive_local
+	rm "$archive_local"
 }
 
 transform_path() {
-  if [[ $OS_NAME == windows ]]; then
-    echo "$1" | sed -e 's/^\///' -e 's/\//\\/g'
-  else
-    echo "$1"
-  fi
+	if [[ $OS_NAME == windows ]]; then
+		echo "$1" | sed -e 's/^\///' -e 's/\//\\/g'
+	else
+		echo "$1"
+	fi
 }
 
 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')
-  version_hash=$(echo "$VERSION_MANIFEST" | jq -r '.hash')
-  version_sha_256=$(echo "$VERSION_MANIFEST" | jq -r '.sha256')
+	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')
+	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}"
+	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 "$expanded_key"
+	echo "$expanded_key"
 }
 
 not_found_error() {
-  echo "Unable to determine Flutter version for channel: $1 version: $2 architecture: $3"
+	echo "Unable to determine Flutter version for channel: $1 version: $2 architecture: $3"
 }
 
 check_command() {
-  command -v "$1" >/dev/null 2>&1
+	command -v "$1" >/dev/null 2>&1
 }
 
 if ! check_command jq; then
-  echo "jq not found, please install it, https://stedolan.github.io/jq/download/"
-  exit 1
+	echo "jq not found, please install it, https://stedolan.github.io/jq/download/"
+	exit 1
 fi
 
 CACHE_PATH=""
@@ -133,17 +133,21 @@ CACHE_KEY=""
 PRINT_MODE=""
 
 while getopts 'c:k:p:' flag; do
-  case "${flag}" in
-  c) CACHE_PATH="$OPTARG" ;;
-  k) CACHE_KEY="$OPTARG"  ;;
-  p) PRINT_MODE="$OPTARG" ;;
-  ?) exit 2 ;;
-  esac
+	case "$flag" in
+	c) CACHE_PATH="$OPTARG" ;;
+	k) CACHE_KEY="$OPTARG" ;;
+	p) PRINT_MODE="$OPTARG" ;;
+	?) exit 2 ;;
+	esac
 done
 
-CHANNEL="${@:$OPTIND:1}"
-VERSION="${@:$OPTIND+1:1}"
-ARCH=$(echo "${@:$OPTIND+2:1}" | awk '{print tolower($0)}')
+ARR_CHANNEL=("${@:$OPTIND:1}")
+ARR_VERSION=("${@:$OPTIND+1:1}")
+ARR_ARCH=("${@:$OPTIND+2:1}")
+
+CHANNEL="${ARR_CHANNEL[0]}"
+VERSION="${ARR_VERSION[0]}"
+ARCH=$(echo "${ARR_ARCH[0]}" | awk '{print tolower($0)}')
 
 # default values
 [[ -z $CHANNEL ]] && CHANNEL=stable
@@ -153,78 +157,74 @@ ARCH=$(echo "${@:$OPTIND+2:1}" | awk '{print tolower($0)}')
 [[ -z $CACHE_KEY ]] && CACHE_KEY="flutter-:os:-:arch:-:channel:-:version:-:hash:"
 
 if [[ -n "$PRINT_MODE" ]]; then
-  if [[ "$CHANNEL" == master ]]; then
-    if [[ "$PRINT_MODE" == version ]]; then
-      echo "master:master:$ARCH|master:master:$ARCH"
-      exit 0
-    fi
+	if [[ "$CHANNEL" == master ]]; then
+		if [[ "$PRINT_MODE" == version ]]; then
+			echo "master:master:$ARCH|master:master:$ARCH"
+			exit 0
+		fi
 
-    if [[ "$PRINT_MODE" == cache-key ]]; then
-      # MASTER_HASH=$(git ls-remote https://github.com/flutter/flutter.git | head -n 1 | awk '{print $1}')
+		if [[ "$PRINT_MODE" == cache-key ]]; then
+			VERSION_MANIFEST="{\"channel\":\"$CHANNEL\",\"version\":\"$CHANNEL\",\"dart_sdk_arch\":\"$ARCH\",\"hash\":\"$CHANNEL\",\"sha256\":\"$CHANNEL\"}"
+			EXPANDED_KEY=$(expand_key "$CACHE_KEY")
 
-      VERSION_MANIFEST="{
-        \"channel\":\"$CHANNEL\",
-        \"version\":\"$CHANNEL\",
-        \"dart_sdk_arch\":\"$ARCH\",
-        \"hash\":\"$CHANNEL\",
-        \"sha256\":\"$CHANNEL\"
-      }"
+			echo "$EXPANDED_KEY"
+			exit 0
+		fi
 
-      EXPANDED_KEY=$(expand_key "$CACHE_KEY")
-      echo "$EXPANDED_KEY"
-      exit 0
-    fi
+		exit 1
+	fi
 
-    exit 1
-  fi
+	RELEASE_MANIFEST=$(cat "$MANIFEST_TEST_PATH")
+	VERSION_MANIFEST=$(get_version_manifest "$CHANNEL" "$VERSION")
 
-  RELEASE_MANIFEST=$(cat "$MANIFEST_TEST_PATH")
-  VERSION_MANIFEST=$(get_version_manifest $CHANNEL $VERSION)
+	if [[ $VERSION_MANIFEST == null ]]; then
+		not_found_error "$CHANNEL" "$VERSION" "$ARCH"
+		exit 1
+	fi
 
-  if [[ $VERSION_MANIFEST == null ]]; then
-    not_found_error $CHANNEL $VERSION $ARCH
-    exit 1
-  fi
+	if [[ "$PRINT_MODE" == version ]]; then
+		VERSION_DEBUG=$(echo "$VERSION_MANIFEST" | jq -j '.channel,":",.version,":",.dart_sdk_arch')
 
-  if [[ "$PRINT_MODE" == version ]]; then
-    VERSION_DEBUG=$(echo "$VERSION_MANIFEST" | jq -j '.channel,":",.version,":",.dart_sdk_arch')
+		echo "$CHANNEL:$VERSION:$ARCH|$VERSION_DEBUG"
+		exit $?
+	fi
 
-    echo "$CHANNEL:$VERSION:$ARCH|$VERSION_DEBUG"
-    exit $?
-  fi
+	if [[ "$PRINT_MODE" == cache-key ]]; then
+		EXPANDED_KEY=$(expand_key "$CACHE_KEY")
 
-  if [[ "$PRINT_MODE" == cache-key ]]; then
-    EXPANDED_KEY=$(expand_key "$CACHE_KEY")
+		echo "$EXPANDED_KEY"
+		exit 0
+	fi
 
-    echo "$EXPANDED_KEY"
-    exit 0
-  fi
-
-  exit 1
+	exit 1
 fi
 
 CACHE_PATH=$(transform_path "$CACHE_PATH")
 SDK_CACHE=$(expand_key "$CACHE_PATH")
-PUB_CACHE=$(expand_key "${SDK_CACHE}/.pub-cache")
+PUB_CACHE=$(expand_key "$SDK_CACHE/.pub-cache")
 
-if [[ ! -x "${SDK_CACHE}/bin/flutter" ]]; then
-  if [[ $CHANNEL == master ]]; then
-    git clone -b master https://github.com/flutter/flutter.git "$SDK_CACHE"
-  else
-    RELEASE_MANIFEST=$(curl --silent --connect-timeout 15 --retry 5 "$MANIFEST_URL")
-    VERSION_MANIFEST=$(get_version_manifest $CHANNEL $VERSION)
-    if [[ $VERSION_MANIFEST == null ]]; then
-      not_found_error $CHANNEL $VERSION $ARCH
-      exit 1
-    fi
-    ARCHIVE_PATH=$(echo $VERSION_MANIFEST | jq -r '.archive')
-    download_archive "$ARCHIVE_PATH" "$SDK_CACHE"
-  fi
+if [[ ! -x "$SDK_CACHE/bin/flutter" ]]; then
+	if [[ $CHANNEL == master ]]; then
+		git clone -b master https://github.com/flutter/flutter.git "$SDK_CACHE"
+	else
+		RELEASE_MANIFEST=$(curl --silent --connect-timeout 15 --retry 5 "$MANIFEST_URL")
+		VERSION_MANIFEST=$(get_version_manifest "$CHANNEL" "$VERSION")
+		if [[ $VERSION_MANIFEST == null ]]; then
+			not_found_error "$CHANNEL" "$VERSION" "$ARCH"
+			exit 1
+		fi
+		ARCHIVE_PATH=$(echo "$VERSION_MANIFEST" | jq -r '.archive')
+		download_archive "$ARCHIVE_PATH" "$SDK_CACHE"
+	fi
 fi
 
-echo "FLUTTER_ROOT=${SDK_CACHE}" >>$GITHUB_ENV
-echo "PUB_CACHE=${PUB_CACHE}" >>$GITHUB_ENV
+{
+	echo "FLUTTER_ROOT=$SDK_CACHE"
+	echo "PUB_CACHE=$PUB_CACHE"
+} >>"$GITHUB_ENV"
 
-echo "${SDK_CACHE}/bin" >>$GITHUB_PATH
-echo "${SDK_CACHE}/bin/cache/dart-sdk/bin" >>$GITHUB_PATH
-echo "${PUB_CACHE}/bin" >>$GITHUB_PATH
+{
+	echo "$SDK_CACHE/bin"
+	echo "$SDK_CACHE/bin/cache/dart-sdk/bin"
+	echo "$PUB_CACHE/bin"
+} >>"$GITHUB_PATH"