Most Effective Way to Grant Access to Code Commit Repository

The most effective way to grant developers in another AWS account access to your Code Commit repository is to create a cross-account role, give the role the necessary privileges, and provide the role ARN to the developers.

Option A, creating IAM users for each developer and providing access to the repository, is not an effective solution because it requires manual management of users and their permissions. It also adds unnecessary complexity as the number of developers increases.

Option B, creating an IAM group and adding the IAM users, is better than Option A as it provides a better way to manage permissions for multiple users. However, it still requires manual management of IAM users, and the number of users increases over time.

Option D, enabling public access for the repository, is not a recommended option as it is not secure and may result in unauthorized access or data leaks.

Option C, creating a cross-account role, is the recommended and most effective option. The cross-account role allows users in another AWS account to assume the role and access the repository with the necessary permissions. This approach provides a secure and centralized way to manage access to the Code Commit repository, and it eliminates the need for managing individual IAM users or groups.

To implement this solution, follow these steps:

1. Create a new IAM role in the AWS account where the Code Commit repository exists.
2. Define the necessary permissions for the role, including access to the Code Commit repository.
3. Add a trust policy to the role, allowing users in the other AWS account to assume the role.
4. Share the role ARN with the developers in the other AWS account.
5. In the other AWS account, create an IAM user or group, and grant permission to assume the cross-account role.
6. Developers can then assume the cross-account role and access the Code Commit repository with the necessary permissions.