45 lines
1.7 KiB
Bash
45 lines
1.7 KiB
Bash
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#!/usr/bin/env bash
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set -ueo pipefail
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# Each Buildkite build stores the derivation target map as a pipeline
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# artifact. This script determines the most appropriate commit (the
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# fork point of the current chain from HEAD) and fetches the artifact.
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#
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# New builds can be based on HEAD before the pipeline for the last
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# commit has finished, in which case it is possible that the fork
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# point has no derivation map. To account for this, up to 3 commits
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# prior to HEAD are also queried to find a map.
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#
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# If no map is found, the failure mode is not critical: We simply
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# build all targets.
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: ${DRVMAP_PATH:=pipeline/drvmap.json}
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: ${BUILDKITE_TOKEN_PATH:=~/buildkite-token}
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git fetch -v origin "${BUILDKITE_PIPELINE_DEFAULT_BRANCH}"
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FIRST=$(git merge-base FETCH_HEAD "${BUILDKITE_COMMIT}")
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SECOND=$(git rev-parse "$FIRST~1")
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THIRD=$(git rev-parse "$FIRST~2")
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function most_relevant_builds {
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set -u
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curl 'https://graphql.buildkite.com/v1' \
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--silent \
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-H "Authorization: Bearer $(cat ${BUILDKITE_TOKEN_PATH})" \
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-d "{\"query\": \"query { pipeline(slug: \\\"$BUILDKITE_ORGANIZATION_SLUG/$BUILDKITE_PIPELINE_SLUG\\\") { builds(commit: [\\\"$FIRST\\\",\\\"$SECOND\\\",\\\"$THIRD\\\"]) { edges { node { uuid }}}}}\"}" | \
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jq -r '.data.pipeline.builds.edges[] | .node.uuid'
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}
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mkdir -p tmp
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for build in $(most_relevant_builds); do
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echo "Checking artifacts for build $build"
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buildkite-agent artifact download --build "${build}" "${DRVMAP_PATH}" 'tmp/' || true
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if [[ -f "tmp/${DRVMAP_PATH}" ]]; then
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echo "Fetched target map from build ${build}"
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mv "tmp/${DRVMAP_PATH}" tmp/parent-target-map.json
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break
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fi
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done
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