Merge pull request #7 from sean-smith/backend-arn-optional

Don't require Backend Environment ARN

README.md

@@ -58,7 +58,7 @@ The following settings must be passed as environment variables as shown in the e
 | `AWS_SECRET_ACCESS_KEY` | Your AWS Secret Access Key. [More info here.](https://docs.aws.amazon.com/general/latest/gr/managing-aws-access-keys.html) | `secret env` | **Yes** | N/A |
 | `AWS_REGION` | The region where you created your bucket. Set to `us-east-1` by default. [Full list of regions here.](https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/using-regions-availability-zones.html#concepts-available-regions) | `env` | **Yes** | `us-east-1` |
 | `AmplifyAppId` | The unique ID for an Amplify app. For example, `d6a88fjhifqlks` | `secret env` | **Yes** | N/A |
-| `BackendEnvARN` | The Amazon Resource Name (ARN) for a backend environment that is part of an Amplify app. | `secret env` | **Yes** | N/A |
+| `BackendEnvARN` | The Amazon Resource Name (ARN) for a backend environment that is part of the Amplify app. If the Amplify App has no backend environment, don't set it. | `secret env` | **No** | N/A |
 | `GITHUB_TOKEN` | The `GITHUB_TOKEN`, should be supplied if a comment with the preview URL is to be posted on the PR.  GitHub automatically creates a `GITHUB_TOKEN` secret to use in your workflow. You can use it directly, see [About the GITHUB_TOKEN secret](https://docs.github.com/en/actions/configuring-and-managing-workflows/authenticating-with-the-github_token#about-the-github_token-secret) | `github env` | No | N/A |
 | `NewBackendEnvARN` | The Amazon Resource Name (ARN) for a backend environment that is part of an Amplify app. | `secret env` | No | N/A |
 

entrypoint.sh

@@ -20,9 +20,10 @@ if [ -z "$AmplifyAppId" ] ; then
   exit 1
 fi
 
-if [ -z "$BackendEnvARN" ] ; then
-  echo "You must provide BackendEnvARN environment variable in order to deploy"
-  exit 1
+if [[ ! -z "$BackendEnvARN" ]] ; then
+  backend_env_arg="--backend-environment-arn=${BackendEnvARN}"
+else
+  backend_env_arg=""
 fi
 
 if [ -z "$BRANCH_NAME" ] ; then
@@ -46,7 +47,7 @@ case $AMPLIFY_COMMAND in
 
   deploy)
     sh -c "aws amplify create-branch --app-id=${AmplifyAppId} --branch-name=$BRANCH_NAME  \
-              --backend-environment-arn=${BackendEnvARN} --region=${AWS_REGION}"
+              ${backend_env_arg} --region=${AWS_REGION}"
 
     sleep 10