How to check and commit code to AWS CodeCommit

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Last updated: 22 Jul 2024

We use AWS CodeCommit as a backup for our GitHub repositories.

The mirror-repos.yml GitHub Actions workflow copies GitHub repositories tagged with govuk to CodeCommit 4 times daily Mon-Fri.

Accessing CodeCommit requires AWS credentials, which you can obtain in the usual ways via gds-cli.

Quick reference guide

This example demonstrates a simple workflow using the govuk-replatform-test-app repository in CodeCommit.

Follow the installation steps first.

# Clone the repo.
gds aws govuk-tools-poweruser git clone codecommit::eu-west-2://govuk-replatform-test-app

# Create a local branch.
cd govuk-replatform-test-app
git checkout -b mybranch

# Commit a change locally.
touch mychange
git commit -m "DO NOT MERGE: testing push to CodeCommit" -- mychange

# Push the branch to CodeCommit.
gds aws govuk-tools-poweruser git push origin mybranch

# Clean up by deleting the example branch we just created.
gds aws govuk-tools-poweruser git push -d origin mybranch

Install dependencies and set up local environment

You need to have first set up the GDS command line tools.

Install git-remote-codecommit:
```
brew install git-remote-codecommit
```
On a Linux machine, you may find it easier to install git-remote-codecommit via pip:
```
pip3 install git-remote-codecommit
```

Configure your git client to use git-remote-codecommit to authenticate to AWS. (See AWS CodeCommit docs for further info.)

git config --global credential.helper '!aws codecommit credential-helper $@'
git config --global credential.UseHttpPath true

This should automatically add the following entry to your ~/.gitconfig file.

[credential]
    helper = !aws codecommit credential-helper $@
    UseHttpPath = true

Find a repository in CodeCommit

Repository names should exactly match those in GitHub. If you are unsure whether a given repository exists in CodeCommit, you can browse the available repositories.

Log into the AWS console to see the available repositories using the GDS command line tool
```
gds aws govuk-tools-poweruser --login
```
Select the London (eu-west-2) region.
Go to the CodeCommit page. You can find it via the search bar or the navigation menu.
Find the repository you want to clone using the repository search bar.
Select the “HTTPS (GRC)” repository URL.

Clone a repository from CodeCommit

If you already have the repository checked out via github under /govuk, there will be a destination clash, so make sure to clone into a fresh directory.

In your shell, obtain AWS credentials and run git clone to clone the repository.

gds aws govuk-tools-poweruser git clone <repository url>

For example:

gds aws govuk-tools-poweruser git clone codecommit::eu-west-2://govuk-replatform-test-app

git clone on CodeCommit can sometimes be very slow initially. If git clone appears to hang at remote: or remote: Enumerating objects, it’s worth waiting several minutes as it may start working.

Pushing to a branch

Once you have cloned a repository from CodeCommit, you can create local branches and push changes as normal, provided you have valid AWS credentials in your shell.