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#!/usr/bin/env bash
REQUEST_URL="https://dev.azure.com/python-discord/${SYSTEM_TEAMPROJECTID}/_apis/build/builds?queryOrder=finishTimeDescending&resultFilter=succeeded&\$top=1&repositoryType=${BUILD_REPOSITORY_PROVIDER}&repositoryId=${BUILD_REPOSITORY_NAME}&branchName=${BUILD_SOURCEBRANCH}&api-version=5.0"
echo "Retrieving previous build's commit using $REQUEST_URL"
RESPONSE="$(curl -sSL "${REQUEST_URL}")"
if [[ $BUILD_REASON = "PullRequest" ]]; then
PREV_COMMIT="$(echo "${RESPONSE}" | grep -Po '"pr\.sourceSha"\s*:\s*"\K.*?[^\\](?="\s*[,}])')"
if [[ -z $PREV_COMMIT ]]; then
echo "Could not retrieve the previous build's commit. Falling back to the head of the target branch."
PREV_COMMIT="origin/$SYSTEM_PULLREQUEST_TARGETBRANCH"
fi
else
PREV_COMMIT="$(echo "${RESPONSE}" | grep -Po '"sourceVersion"\s*:\s*"\K.*?[^\\](?="\s*[,}])')"
fi
if [[ -n $PREV_COMMIT ]]; then
echo "Using $PREV_COMMIT to compare diffs."
if [[ -z "$(git diff $PREV_COMMIT -- docker/base.Dockerfile)" ]]; then
echo "No changes detected in docker/base.Dockerfile. The base image will not be built."
echo "##vso[task.setvariable variable=BASE_CHANGED]false"
fi
if [[ -z "$(git diff $PREV_COMMIT -- docker/venv.Dockerfile Pipfile*)" ]]; then
echo "No changes detected in docker/venv.Dockerfile or the Pipfiles. The venv image will not be built."
echo "##vso[task.setvariable variable=VENV_CHANGED]false"
fi
else
echo "No previous commit was retrieved. Either the previous build is too old and was deleted or the branch was empty before this build. All images will be built."
fi
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