prometheus/scripts/sync_makefiles.sh

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#!/usr/bin/env bash
# vim: ts=2 et
# Setting -x is absolutely forbidden as it could leak the GitHub token.
set -uo pipefail
# GITHUB_TOKEN required scope: repo.repo_public
git_mail="prometheus-team@googlegroups.com"
git_user="prombot"
branch="makefile_common"
commit_msg="makefile: update Makefile.common with newer version"
pr_title="Synchronize Makefile.common from prometheus/prometheus"
pr_msg="Propagating changes from master Makefile.common located in prometheus/prometheus."
orgs="prometheus prometheus-community"
GITHUB_TOKEN="${GITHUB_TOKEN:-}"
if [ -z "${GITHUB_TOKEN}" ]; then
echo -e "\e[31mGitHub token (GITHUB_TOKEN) not set. Terminating.\e[0m"
exit 1
fi
# Go to the root of the repo
cd "$(git rev-parse --show-cdup)" || exit 1
source_makefile="$(pwd)/Makefile.common"
source_checksum="$(sha256sum Makefile.common | cut -d' ' -f1)"
tmp_dir="$(mktemp -d)"
trap 'rm -rf "${tmp_dir}"' EXIT
fetch_repos() {
local url="https://api.github.com/users/${1}/repos?per_page=100"
curl --retry 5 --silent -u "${git_user}:${GITHUB_TOKEN}" "${url}" 2>/dev/null |
jq -r '.[] | select( .name != "prometheus" ) | .name'
}
push_branch() {
# stdout and stderr are redirected to /dev/null otherwise git-push could leak
# the token in the logs.
git push --quiet \
"https://${GITHUB_TOKEN}:@github.com/${1}" \
--set-upstream "${branch}" 1>/dev/null 2>&1
}
post_template='{"title":"%s","base":"master","head":"%s","body":"%s"}'
post_json="$(printf "${post_template}" "${pr_title}" "${branch}" "${pr_msg}")"
post_pull_request() {
curl --show-error --silent --fail \
-u "${git_user}:${GITHUB_TOKEN}" \
-d "${post_json}" \
"https://api.github.com/repos/${1}/pulls"
}
process_repo() {
local org_repo="$1"
echo -e "\e[32mAnalyzing '${org_repo}'\e[0m"
target_makefile="$(curl -s --fail "https://raw.githubusercontent.com/${org_repo}/master/Makefile.common")"
if [ -z "${target_makefile}" ]; then
echo "Makefile.common doesn't exist in ${org_repo}"
return
fi
target_checksum="$(echo "${target_makefile}" | sha256sum | cut -d' ' -f1)"
if [ "${source_checksum}" == "${target_checksum}" ]; then
echo "Makefile.common is already in sync."
return
fi
# Clone target repo to temporary directory and checkout to new branch
git clone --quiet "https://github.com/${org_repo}.git" "${tmp_dir}/${org_repo}"
cd "${tmp_dir}/${org_repo}" || return 1
git checkout -b "${branch}" || return 1
# Replace Makefile.common in target repo by one from prometheus/prometheus
cp -f "${source_makefile}" ./
if [ -n "$(git status --porcelain)" ]; then
git config user.email "${git_mail}"
git config user.name "${git_user}"
git add .
git commit -s -m "${commit_msg}"
if push_branch "${org_repo}"; then
post_pull_request "${org_repo}"
fi
fi
}
for org in ${orgs}; do
mkdir -p "${tmp_dir}/${org}"
# Iterate over all repositories in ${org}. The GitHub API can return 100 items
# at most but it should be enough for us as there are less than 40 repositories
# currently.
fetch_repos "${org}" | while read -r repo; do
if ! process_repo "${org}/${repo}"; then
echo "Failed to process '${org}/${repo}'"
exit 1
fi
done
done