Clone and Process Multiple Codebases in the Same Pipeline

Updated 2 weeks ago by Doug Bothwell

You can clone multiple codebases in the same Pipeline and then build artifacts from multiple repositories. This enables use cases such as:

  • You use Packer and Ansible to build artifacts automatically. Your organization maintains separate repos for Packer, Ansible, and code. You set up a Run Step that clones all three repos and then builds artifacts from a common workspace.
  • Your code files are in one repo managed by the Engineering team. Your Docker files are in a separate repo managed by the Security team. Your Pipeline clones both repos and then builds a Docker image from a common workspace.

This topic uses the second use case to illustrate how to clone and combine multiple repos into one workspace. The example Pipeline works as follows:

  • The Build Stage specifies the code repo as the default Codebase. The Build setup process clones this repo into the build workspace automatically.
  • A Run Step clones the Docker repo into the workspace.
  • A Build Step builds and pushes an image using files from both repos in the build workspace.

Before You Begin

To go through this workflow, you need the following:

Step 1: Set Up the Build Stage

In the first Build Stage of your Pipeline, do the following:

  1. Configure the default Codebase.
    You set up the Codebase when you create the first Build Stage in your Pipeline. To edit a Codebase after you create it, click Codebase on the right side of the Pipeline Studio. See Create and Configure a Codebase.
  2. In the Overview tab, verify that Clone Codebase is selected.
    With this option selected (the default), a Build clones the default codebase into its workspace as part of the setup process. You can clone additional codebases into the workspace, as described below.

Step 2: Define the Build Farm Infrastructure

In the CI stage Infrastructure, define the build farm for the codebase. See Set Up Build Infrastructure.

Step 4: Add Run Steps to Clone Additional Repos

You can create one or more Run Steps to clone additional repos into the build workspace. Note the following:

  • Depending on the image you use for the Run Step, you might need to install Git before you clone any repos.
  • You might want to define Stage Variables for the names and URLs of the codebases that you clone into the workspace. These variables are accessible across all Steps in the Stage.

Here's some example code that installs git, verifies that it's working, and clones the repo with the Dockerfile needed to build an image:

apk add git
git --version
git clone https://github.com/$GITHUB_USERNAME/$DOCKER_REPO

Step 5: Move Files and Folders as Needed

You now have your default Codebase and additional codebases cloned into the same workspace. Note that the default Codebase files are in the root folder, while other codebase files are in subfolders. If you run a find or a recursive ls in the Run step after you clone your codebases, you see something like this:

# Files from default codebase:
87 info 4/26/2022 10:43:31 AM ./setup-be-service.sh
88 info 4/26/2022 10:43:31 AM ./default-be-template.json
89 info 4/26/2022 10:43:31 AM ./core/
90 info 4/26/2022 10:43:31 AM ./core/src/
...
# Files from $DOCKER_REPO codebase:
146 info 4/26/2022 10:43:31 AM ./myDockerRepo/myBackendService
147 info 4/26/2022 10:43:31 AM ./myDockerRepo/myBackendService/Dockerfile

In this example workflow, you need to copy the Dockerfile for the back-end service into the root workspace folder:

# This assumes that Dockerfiles are arranged by app-repo name in the Docker repo:
cp $DOCKER_REPO/$APP_REPO/Dockerfile .

Now the Dockerfile is in the correct location to build the image:

./setup-backend-service.sh
./default-be-template.json
./Dockerfile
./core/
...

Step 5: Add a Build and Push Step

Now that the files from your repos are in one common workspace, you can add a Build Step (in this case, Build and Push an Image to Docker Registry) to your Stage.

Step 5: Run the Pipeline

Now you can run your Pipeline.

  1. Click Save.
  2. Click Run.
  3. If prompted, specify a Git branch, tag, or PR number.
  4. Click Run Pipeline and check the console output to verify that the Pipeline runs as intended.

Configure As Code: YAML

To configure your pipeline as YAML in CI, go to Harness Pipeline Studio, click YAML. Here’s a working example of the use case described in this topic. Modify the YAML attributes such as name, identifiers, codebase, connector refs, and variables as needed.

pipeline:
name: build-from-multiple-repos-example
identifier: buildfrommultiplereposexample
allowStageExecutions: false
projectIdentifier: docexampleproject
orgIdentifier: wtd
description: Git clone, copy Dockerfile from myDockerRepo to workspace root, build image
tags: {}
properties:
ci:
codebase:
connectorRef: mygithubconnector
repoName: myBackendService
build: <+input>
stages:
- stage:
name: Build myBackendService
identifier: Build_Test_and_Push
type: CI
spec:
cloneCodebase: true
infrastructure:
type: KubernetesDirect
spec:
connectorRef: mydelegateconnector
namespace: harness-delegate-ng
automountServiceAccountToken: true
execution:
steps:
- step:
type: Run
name: git-clone-and-copy-dockerfile
identifier: echotriggervarscustom
spec:
connectorRef: mydockerhubconnector
image: alpine:latest
shell: Sh
command: |+
# Clone Codebase is enabled, which copies all
# files and folders to the current folder.
# Before we can build an image, we need to clone the
# Docker repo and copy the corresponding Dockerfile
# to the current folder

apk add git
git --version
git clone https://github.com/$GITHUB_USERNAME/$DOCKER_REPO

# We now have Docker repo at the current folder:
find .

# Copy Dockerfile to current folder, where the Docker Build
# step can find it:
cp $DOCKER_REPO/$APP_REPO/Dockerfile .

privileged: true
- step:
type: BuildAndPushDockerRegistry
name: build-my-backend-service
identifier: buildmybackendservice
spec:
connectorRef: mydockerhubconnector
repo: <+input>
tags:
- <+pipeline.sequenceId>
- latest
optimize: true
variables:
- name: GITHUB_USERNAME
type: Secret
value: msharmadgithubuname
- name: APP_REPO
type: String
value: myBackendService
- name: DOCKER_REPO
type: String
value: myDockerRepo
failureStrategies: []

See Also


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