Deal with different types of runniing, and output snyk version

setup/action.yml

@@ -8,8 +8,15 @@ inputs:
   snyk-version:
     description: "Which Snyk version to install"
     default: latest
+outputs:
+  version:
+    description: "The version of Snyk installed"
+    value: ${{ steps.version.outputs.version }}
 runs:
   using: "composite"
   steps:
-    - run: ${{ github.action_path }}/setup_snyk.sh ${{ inputs.snyk-version }}
+    - run: ${{ github.action_path }}/setup_snyk.sh ${{ inputs.snyk-version }} ${{ runner.os }}
       shell: bash
+    - id: version
+      shell: bash
+      run: echo "::set-output name=version::$(snyk version)"

setup/setup_snyk.sh

@@ -6,29 +6,42 @@ die () {
     exit 1
 }
 
-[ "$#" -eq 1 ] || die "Setup Snyk requires a single argument, $# provided"
+[ "$#" -eq 2 ] || die "Setup Snyk requires two argument, $# provided"
 
-echo "Installing the $1 version of Snyk"
+echo "Installing the $1 version of Snyk on $2"
 
 if [ "$1" == "latest" ]; then
     URL="https://api.github.com/repos/snyk/snyk/releases/${1}"
 else
     URL="https://api.github.com/repos/snyk/snyk/releases/tags/${1}"
 fi
 
+case "$2" in
+    Linux)
+        PREFIX=linux
+        ;;
+    Windows)
+        die "Windows runner not currently supported"
+        ;;
+    macOS)
+        PREFIX=macos
+        ;;
+    *)
+        die "Invalid running specified: $2"
+esac
+
 {
     echo "#!/bin/bash"
     echo export SNYK_INTEGRATION_NAME="GITHUB_ACTIONS"
-    echo export SNYK_INTEGRATION_VERSION="setup"
-    echo eval snyk-linux \$@
+    echo export SNYK_INTEGRATION_VERSION="setup (${2})"
+    echo eval snyk-${PREFIX} \$@
 } > snyk
 
 chmod +x snyk
 sudo mv snyk /usr/local/bin
 
-wget -qO- ${URL} | grep "browser_download_url" | grep linux | cut -d '"' -f 4 | wget --progress=bar:force:noscroll -i -
-
-sha256sum -c snyk-linux.sha256
-chmod +x snyk-linux
-sudo mv snyk-linux /usr/local/bin
+wget -qO- ${URL} | grep "browser_download_url" | grep $PREFIX | cut -d '"' -f 4 | wget --progress=bar:force:noscroll -i -
 
+sha256sum -c snyk-${PREFIX}.sha256
+chmod +x snyk-${PREFIX}
+sudo mv snyk-${PREFIX} /usr/local/bin