Pass PR labels to a triggered child build

Pipelines
3

Thanks Juanito.

In the meantime, I got something working by using build meta-data and dynamic pipeline.

On the first pipeline, I have one step that use the conditional to set metadata:

  - label: ":triangular_flag_on_post:"
    command: buildkite-agent meta-data set "my-flag" "true"
    if: "build.pull_request.labels includes \"my label\""

I’ve then modified my trigger step to dynamically upload itself to the pipeline and set the env variables based on the meta-data set in that previous step.

- command: ".buildkite/trigger-tests.sh"
  label: ":hammer: Test"

.buildkite/trigger-tests.sh:

#!/bin/bash

set -euo pipefail

# Set up a variable to hold the meta-data from previous steps
MY_FLAG="$(buildkite-agent meta-data get "my-flag" --default "")"

# Create a pipeline with the trigger step
PIPELINE="steps:
  - trigger: \"web-tests\"
    label: \":hammer: Test\"
    async: true
    build:
      message: ${BUILDKITE_MESSAGE}
      commit: ${BUILDKITE_COMMIT}
      branch: ${BUILDKITE_BRANCH}
      env:
        BUILDKITE_PULL_REQUEST: ${BUILDKITE_PULL_REQUEST}
        BUILDKITE_PULL_REQUEST_BASE_BRANCH: ${BUILDKITE_PULL_REQUEST_BASE_BRANCH}
        BUILDKITE_PULL_REQUEST_REPO: ${BUILDKITE_PULL_REQUEST_REPO}
        MY_FLAG: ${MY_FLAG}
"

# Upload the new pipeline and add it to the current build
echo "$PIPELINE" | buildkite-agent pipeline upload
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