# cdk-ecr-deployment

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CDK construct to synchronize single docker image between docker registries.

**Only use v3 of this package**

⚠️ Version 2.* is no longer supported, as the Go.1.x runtime is no longer supported in AWS Lambda.\
⚠️ Version 1.* is no longer supported, as CDK v1 has reached the end-of-life
stage.

## Features

- Copy image from ECR/external registry to (another) ECR/external registry
- Copy an archive tarball image from s3 to ECR/external registry

## Environment variables

Enable flags: `true`, `1`. e.g. `export CI=1`

- `CI` indicate if it's CI environment. This flag will enable building lambda from scratch.
- `NO_PREBUILT_LAMBDA` disable using prebuilt lambda.
- `FORCE_PREBUILT_LAMBDA` force using prebuilt lambda.

⚠️ If you want to force using prebuilt lambda in CI environment to reduce build time. Try `export FORCE_PREBUILT_LAMBDA=1`.

## Examples

```ts
import { DockerImageAsset } from 'aws-cdk-lib/aws-ecr-assets';

const image = new DockerImageAsset(this, 'CDKDockerImage', {
  directory: path.join(__dirname, 'docker'),
});

// Copy from cdk docker image asset to another ECR.
new ecrdeploy.ECRDeployment(this, 'DeployDockerImage1', {
  src: new ecrdeploy.DockerImageName(image.imageUri),
  dest: new ecrdeploy.DockerImageName(`${cdk.Aws.ACCOUNT_ID}.dkr.ecr.us-west-2.amazonaws.com/my-nginx:latest`),
});

// Copy from docker registry to ECR.
new ecrdeploy.ECRDeployment(this, 'DeployDockerImage2', {
  src: new ecrdeploy.DockerImageName('nginx:latest'),
  dest: new ecrdeploy.DockerImageName(`${cdk.Aws.ACCOUNT_ID}.dkr.ecr.us-west-2.amazonaws.com/my-nginx2:latest`),
});

// Copy from private docker registry to ECR.
// The format of secret in aws secrets manager must be either:
// - plain text in format <username>:<password>
// - json in format {"username":"<username>","password":"<password>"}
new ecrdeploy.ECRDeployment(this, 'DeployDockerImage3', {
  src: new ecrdeploy.DockerImageName('javacs3/nginx:latest', 'username:password'),
  // src: new ecrdeploy.DockerImageName('javacs3/nginx:latest', 'aws-secrets-manager-secret-name'),
  // src: new ecrdeploy.DockerImageName('javacs3/nginx:latest', 'arn:aws:secretsmanager:us-west-2:000000000000:secret:id'),
  dest: new ecrdeploy.DockerImageName(`${cdk.Aws.ACCOUNT_ID}.dkr.ecr.us-west-2.amazonaws.com/my-nginx3:latest`),
}).addToPrincipalPolicy(new iam.PolicyStatement({
  effect: iam.Effect.ALLOW,
  actions: [
    'secretsmanager:GetSecretValue',
  ],
  resources: ['*'],
}));
```

## Sample: [test/example.ecr-deployment.ts](./test/example.ecr-deployment.ts)

After cloning the repository, install dependencies and run a full build:

```console
yarn --frozen-lockfile --check-files
yarn build
```

Then run the example like this:

```shell
# Run the following command to try the sample.
NO_PREBUILT_LAMBDA=1 npx cdk deploy -a "npx ts-node -P tsconfig.dev.json --prefer-ts-exts test/example.ecr-deployment.ts"
```

To run the DockerHub example you will first need to setup a Secret in AWS Secrets Manager to provide DockerHub credentials.
Replace `username:access-token` with your credentials.
**Please note that Secrets will occur a cost.**

```console
aws secretsmanager create-secret --name DockerHubCredentials --secret-string "username:access-token"
```

From the output, copy the ARN of your new secret and export it as env variable

```console
export DOCKERHUB_SECRET_ARN="<ARN>"
```

Finally run:

```shell
# Run the following command to try the sample.
npx cdk deploy -a "npx ts-node -P tsconfig.dev.json --prefer-ts-exts test/dockerhub-example.ecr-deployment.ts"
```

If your Secret is encrypted, you might have to adjust the example to also grant decrypt permissions.

## [API](./API.md)

## Tech Details & Contribution

The core of this project relies on [containers/image](https://github.com/containers/image) which is used by [Skopeo](https://github.com/containers/skopeo).
Please take a look at those projects before contribution.

To support a new docker image source(like docker tarball in s3), you need to implement [image transport interface](https://github.com/containers/image/blob/master/types/types.go). You could take a look at [docker-archive](https://github.com/containers/image/blob/ccb87a8d0f45cf28846e307eb0ec2b9d38a458c2/docker/archive/transport.go) transport for a good start.

Any error in the custom resource provider will show up in the CloudFormation error log as `Invalid PhysicalResourceId`, because of this: <https://github.com/aws/aws-lambda-go/issues/107>. You need to go into the CloudWatch Log Group to find the real error.