Granting a user read access to an Artifact Registry repository

Question

Pulumi · Accepted Answer

To grant a user read access to an Artifact Registry repository, you would use the `RepositoryIamMember` resource to attach a IAM policy to the repository, specifying the user's identity and the role allowing read access.

In the context of Google Cloud Platform, IAM policies define who (members) has what access (role) to which resource. For granting read access, the predefined role `roles/artifactregistry.reader` can be used. This role includes permissions to read the contents of repositories within Artifact Registry.

The `RepositoryIamMember` resource is a part of the `gcp` Pulumi package, which we'll use in this scenario because it provides a convenient abstraction for managing IAM policies on GCP resources.

Here is a program written in TypeScript that demonstrates how to grant a user read access to a specific Artifact Registry repository.

```typescript
import * as gcp from "@pulumi/gcp";

// Replace these variables with the actual IDs/names of your project and Artifact Registry Repository.
const projectId = "your-gcp-project-id";
const location = "your-artifact-registry-location"; // e.g., "us-central1"
const repositoryName = "your-artifact-registry-repo-name";

// The user's identity whom you want to grant read access to. 
// This could be an email address associated with a Google account or a service account.
const userEmail = "user-email@example.com";

const repositoryIamMember = new gcp.artifactregistry.RepositoryIamMember("repoReadAccess", {
    project: projectId,
    location: location,
    repository: repositoryName,
    role: "roles/artifactregistry.reader",
    member: `user:${userEmail}`,
});

export const repositoryIamMemberId = repositoryIamMember.id;
```

In this program:
- We import the `@pulumi/gcp` package which contains the necessary Google Cloud Platform (GCP) resource types.
- `projectId`, `location`, and `repositoryName` are variables to be replaced with your specific project ID, location, and repository name within your GCP Artifact Registry.
- `userEmail` should be substituted with the email of the user you wish to grant access to. This email can refer to either a Google account (like a G Suite or Gmail account) or a service account.
- We create a new `RepositoryIamMember` Pulumi resource which represents the IAM policy attachment to your repository. We specify the role as `roles/artifactregistry.reader`, which grants read permissions, and we set the `member` to the user's email address.
- `repositoryIamMemberId` is exported from the Pulumi program, which allows you to see the ID of the IAM policy attachment in your Pulumi stack outputs after deploying.

To run this Pulumi program, you would need to have Pulumi installed and a GCP project set up with credentials configured for Pulumi to access your project. Once those prerequisites are in place, you can place this code in a file named `index.ts` and use the Pulumi CLI to create a new stack and deploy it:

```sh
pulumi stack init dev
pulumi up
```

Always make sure you have appropriate permissions to make IAM changes in your GCP project, and understand the implications of granting access to ensure you do not unintentionally expose sensitive resources.