tvl-depot/ops/pipelines/fetch-parent-targets.sh
Vincent Ambo 9596c642d5 feat(ops/pipelines): Fetch parent target map for pipeline generation
Change-Id: I1c7d48fc0974549d67146a15f79ddb0b6ddfe805
Reviewed-on: https://cl.tvl.fyi/c/depot/+/4947
Tested-by: BuildkiteCI
Reviewed-by: sterni <sternenseemann@systemli.org>
2022-01-17 11:49:01 +00:00

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