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add multi-branch workflow example
Signed-off-by: Aidan Oldershaw <aoldershaw@pivotal.io>
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‎pipelines/multi-branch/template.yml

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resource_types:
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- name: terraform
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type: registry-image
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source:
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repository: ljfranklin/terraform-resource
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- name: gcs
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type: registry-image
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source:
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repository: frodenas/gcs-resource
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resources:
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- name: branch
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type: git
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source:
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uri: https://github.com/concourse/examples
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branch: ((branch))
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- name: examples
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type: git
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source:
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uri: https://github.com/concourse/examples
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- name: build-artifact
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type: gcs
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source:
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bucket: concourse-examples
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json_key: ((concourse_artifacts_json_key))
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regexp: multi-branch/features/((feature))/my-app-(.+)\.tgz
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- name: staging-env
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type: terraform
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source:
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env_name: ((feature))
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backend_type: gcs
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backend_config:
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bucket: concourse-examples
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prefix: multi-branch/terraform
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credentials: ((concourse_artifacts_json_key))
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jobs:
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- name: test
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plan:
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- in_parallel:
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- get: branch
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trigger: true
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- get: examples
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- task: unit
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file: examples/tasks/go-test.yml
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input_mapping: {repo: branch}
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params: {MODULE: apps/golang}
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- name: build
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plan:
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- in_parallel:
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- get: branch
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passed: [test]
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trigger: true
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- get: examples
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- task: build
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file: examples/tasks/go-build.yml
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params:
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MODULE: apps/golang
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BINARY_NAME: my-app
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input_mapping: {repo: branch}
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- put: build-artifact
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params: {file: "binary/my-app-*.tgz"}
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- name: deploy
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plan:
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- in_parallel:
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- get: build-artifact
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passed: [build]
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trigger: true
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- get: examples
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- load_var: bundle_url
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file: build-artifact/url
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- put: staging-env
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params:
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terraform_source: examples/terraform/staging
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vars: {bundle_url: ((.:bundle_url))}

‎pipelines/multi-branch/tracker.yml

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resource_types:
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- name: git-branches
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type: registry-image
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source:
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repository: aoldershaw/git-branches-resource
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resources:
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- name: feature-branches
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type: git-branches
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source:
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uri: https://github.com/concourse/examples
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branch_regex: 'feature/(?P<feature>.*)'
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- name: examples
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type: git
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source:
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uri: https://github.com/concourse/examples
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jobs:
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- name: set-feature-pipelines
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plan:
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- in_parallel:
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- get: feature-branches
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trigger: true
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- get: examples
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- load_var: branches
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file: feature-branches/branches.json
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- across:
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- var: branch
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values: ((.:branches))
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set_pipeline: dev
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file: examples/pipelines/multi-branch/template.yml
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instance_vars: {feature: ((.:branch.groups.feature))}
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vars: {branch: ((.:branch.name))}
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- name: cleanup-inactive-workspaces
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plan:
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- get: feature-branches
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passed: [set-feature-pipelines]
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trigger: true
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- load_var: active_branches
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file: feature-branches/branches.json
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- task: cleanup
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config:
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platform: linux
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image_resource:
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type: registry-image
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source: {repository: hashicorp/terraform}
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params:
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ACTIVE_BRANCHES: ((.:active_branches))
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TERRAFORM_BACKEND_CONFIG:
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terraform:
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backend:
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gcs:
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bucket: concourse-examples
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prefix: multi-branch/terraform
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credentials: ((concourse_artifacts_json_key))
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run:
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path: sh
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args:
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- -c
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- |
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set -euo pipefail
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apk add jq
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active_features="$(echo "$ACTIVE_BRANCHES" | jq '[.[].groups.feature]')"
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echo "$TERRAFORM_BACKEND_CONFIG" > backend.tf.json
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terraform init
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active_workspaces="$(terraform workspace list | grep -v '^[*]' | tr -d ' ' | jq --raw-input --slurp 'split("\n") | map(select(. != ""))')"
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jq -nr "$active_workspaces - $active_features | .[]" | while read extra_workspace
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do
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echo "deleting workspace $extra_workspace"
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terraform workspace select "$extra_workspace"
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terraform init
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terraform destroy -auto-approve
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terraform workspace select default
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terraform workspace delete "$extra_workspace"
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done

‎tasks/go-build.yml

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platform: linux
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image_resource:
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type: registry-image
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source: { repository: golang }
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inputs:
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- name: repo
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path: .
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outputs:
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- name: binary
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params:
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MODULE:
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BINARY_NAME:
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run:
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path: sh
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args:
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- -ce
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- |
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root=$(pwd)
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cd "$MODULE"
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go build -o "/tmp/$BINARY_NAME"
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timestamp=$(date '+%Y%m%d%H%M%S')
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tar czf "$root/binary/$BINARY_NAME-$timestamp.tgz" -C /tmp "$BINARY_NAME"

‎tasks/go-test.yml

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platform: linux
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image_resource:
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type: registry-image
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source: { repository: golang }
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inputs:
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- name: repo
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path: .
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params:
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MODULE:
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run:
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path: sh
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args:
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- -ce
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- |
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cd "$MODULE"
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go test -v ./...

‎terraform/staging/main.tf

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variable "bundle_url" {
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type = string
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}
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resource "null_resource" "fake_deployment" {
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triggers = {
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bundle_url = var.bundle_url
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}
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provisioner "local-exec" {
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command = "echo \"pretending to deploy from ${var.bundle_url}\"..."
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}
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}

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