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#!/usr/bin/env bash
set -euo pipefail
shopt -s inherit_errexit
exec 3>&1 # New file descriptor to stdout
BASE_URL="https://dev.azure.com/\
python-discord/${SYSTEM_TEAMPROJECTID}/_apis/build/builds?\
queryOrder=finishTimeDescending&\
resultFilter=succeeded&\
\$top=1&\
repositoryType=${BUILD_REPOSITORY_PROVIDER}&\
repositoryId=${BUILD_REPOSITORY_NAME}&\
api-version=5.0"
get_build() {
local branch="${1:?"get_build: argument 1 'branch' is unset"}"
local url="${BASE_URL}&branchName=${branch}"
printf '%s\n' "Retrieving the latest successful build using ${url}" >&3
local response
response="$(curl -sSL "${url}")"
if [[ -z "${response}" ]] \
|| ! count="$(printf '%s' "${response}" | jq -re '.count')" \
|| (( "${count}" < 1 ))
then
return 1
else
printf '%s' "${response}"
fi
}
# Get the previous commit
if [[ "${BUILD_REASON}" = "PullRequest" ]]; then
if ! prev_commit="$(
get_build "${BUILD_SOURCEBRANCH}" \
| jq -re '.value[0].triggerInfo."pr.sourceSha"'
)"
then
echo \
"Could not retrieve the previous build's commit." \
"Falling back to the head of the target branch."
prev_commit="origin/${SYSTEM_PULLREQUEST_TARGETBRANCH}"
fi
elif ! prev_commit="$(
get_build "${BUILD_SOURCEBRANCH}" \
| jq -re '.value[0].sourceVersion'
)"
then
echo \
"No previous build was found." \
"Either the previous build is too old and was deleted" \
"or the branch was empty before this build." \
"All images will be built."
exit 0
fi
# Compare diffs
head="$(git rev-parse HEAD)"
printf '%s\n' "Comparing HEAD (${head}) against ${prev_commit}."
if git diff --quiet "${prev_commit}" -- docker/base.Dockerfile; then
echo "No changes detected in docker/base.Dockerfile."
echo "##vso[task.setvariable variable=BASE_CHANGED]False"
else
# Always rebuild the venv if the base changes.
echo "Changes detected in docker/base.Dockerfile; all images will be built."
exit 0
fi
if git diff --quiet "${prev_commit}" -- docker/venv.Dockerfile Pipfile*; then
echo "No changes detected in docker/venv.Dockerfile or the Pipfiles."
echo "##vso[task.setvariable variable=VENV_CHANGED]False"
else
echo \
"Changes detected in docker/venv.Dockerfile or the Pipfiles;" \
"the venv image will be built."
# Though base image hasn't changed, it's still needed to build the venv.
if master_commit="$(
get_build "refs/heads/master" \
| jq -re '.value[0].sourceVersion'
)" \
&& git diff --quiet "${master_commit}" -- docker/base.Dockerfile
then
echo "Can pull base image from Docker Hub; no changes since master."
echo "##vso[task.setvariable variable=BASE_PULL]True"
else
echo \
"Cannot pull base image from Docker Hub due to detected changes;" \
"the base image will be built."
fi
fi
|
