GitHub Action to Sync S3 Bucket & Invalidate a Cloudfront Distribution 🔄

This simple action uses the vanilla AWS CLI to sync a directory (either from your repository or generated during your workflow) with a remote S3 bucket. After the sync, the same profile invalidates a cloudfront distribution. This is a common pattern when an S3 bucket is the origin for the corresponding distribution.

Usage

workflow.yml Example

Place in a .yml file such as this one in your .github/workflows folder. Refer to the documentation on workflow YAML syntax here.

As of v0.1.1, all aws s3 sync flags are optional and must be provided by you via args:.

The following example includes optimal defaults for a public static website:

• --acl public-read makes your files publicly readable (make sure your bucket settings are also set to public).
• --follow-symlinks won't hurt and fixes some weird symbolic link problems that may come up.
• Most importantly, --delete permanently deletes files in the S3 bucket that are not present in the latest version of your repository/build.
• Optional tip: If you're uploading the root of your repository, adding --exclude '.git/*' prevents your .git folder from syncing, which would expose your source code history if your project is closed-source. (To exclude more than one pattern, you must have one --exclude flag per exclusion. The single quotes are also important!)

name: Upload Website & Invalidate

on:
  push:
    branches:
    - master

jobs:
  deploy:
    runs-on: ubuntu-latest
    steps:
    - uses: actions/checkout@master
    - uses: digital-scarcity/s3-sync-action@master
      with:
        args: --acl public-read --follow-symlinks --delete
      env:
        AWS_S3_BUCKET: ${{ secrets.AWS_S3_BUCKET }}
        AWS_ACCESS_KEY_ID: ${{ secrets.AWS_ACCESS_KEY_ID }}
        AWS_SECRET_ACCESS_KEY: ${{ secrets.AWS_SECRET_ACCESS_KEY }}
        AWS_REGION: 'us-west-1'   # optional: defaults to us-east-1
        SOURCE_DIR: 'public'      # optional: defaults to entire repository
        AWS_DISTRIBUTION_ID: ${{ secrets.AWS_DISTRIBUTION_ID }}

Configuration

The following settings must be passed as environment variables as shown in the example. Sensitive information, especially AWS_ACCESS_KEY_ID and AWS_SECRET_ACCESS_KEY, should be set as encrypted secrets — otherwise, they'll be public to anyone browsing your repository's source code and CI logs.

Key	Value	Suggested Type	Required	Default
AWS_ACCESS_KEY_ID	Your AWS Access Key. More info here.	secret env	Yes	N/A
AWS_SECRET_ACCESS_KEY	Your AWS Secret Access Key. More info here.	secret env	Yes	N/A
AWS_S3_BUCKET	The name of the bucket you're syncing to. For example, jarv.is or my-app-releases.	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.	env	No	us-east-1
AWS_S3_ENDPOINT	The endpoint URL of the bucket you're syncing to. Can be used for VPC scenarios or for non-AWS services using the S3 API, like DigitalOcean Spaces.	env	No	Automatic (s3.amazonaws.com or AWS's region-specific equivalent)
SOURCE_DIR	The local directory (or file) you wish to sync/upload to S3. For example, public. Defaults to your entire repository.	env	No	./ (root of cloned repository)
DEST_DIR	The directory inside of the S3 bucket you wish to sync/upload to. For example, my_project/assets. Defaults to the root of the bucket.	env	No	/ (root of bucket)
AWS_DISTRIBUTION_ID	The distribution ID found in the Cloudfront section of AWS Console	env	Yes	N/A

License

This project is distributed under the MIT license.