nixpkgs/ci/request-reviews/get-reviewers.sh

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#!/usr/bin/env bash
# Get the code owners of the files changed by a PR,
# suitable to be consumed by the API endpoint to request reviews:
# https://docs.github.com/en/rest/pulls/review-requests?apiVersion=2022-11-28#request-reviewers-for-a-pull-request
set -euo pipefail
log() {
echo "$@" >&2
}
if (( "$#" < 7 )); then
log "Usage: $0 GIT_REPO OWNERS_FILE BASE_REPO BASE_REF HEAD_REF PR_NUMBER PR_AUTHOR"
exit 1
fi
gitRepo=$1
ownersFile=$2
baseRepo=$3
baseRef=$4
headRef=$5
prNumber=$6
prAuthor=$7
tmp=$(mktemp -d)
trap 'rm -rf "$tmp"' exit
git -C "$gitRepo" diff --name-only --merge-base "$baseRef" "$headRef" > "$tmp/touched-files"
readarray -t touchedFiles < "$tmp/touched-files"
log "This PR touches ${#touchedFiles[@]} files"
# Get the owners file from the base, because we don't want to allow PRs to
# remove code owners to avoid pinging them
git -C "$gitRepo" show "$baseRef":"$ownersFile" > "$tmp"/codeowners
# Associative array with the user as the key for easy de-duplication
# Make sure to always lowercase keys to avoid duplicates with different casings
declare -A users=()
for file in "${touchedFiles[@]}"; do
result=$(codeowners --file "$tmp"/codeowners "$file")
read -r file owners <<< "$result"
if [[ "$owners" == "(unowned)" ]]; then
log "File $file is unowned"
continue
fi
log "File $file is owned by $owners"
# Split up multiple owners, separated by arbitrary amounts of spaces
IFS=" " read -r -a entries <<< "$owners"
for entry in "${entries[@]}"; do
# GitHub technically also supports Emails as code owners,
# but we can't easily support that, so let's not
if [[ ! "$entry" =~ @(.*) ]]; then
warn -e "\e[33mCodeowner \"$entry\" for file $file is not valid: Must start with \"@\"\e[0m" >&2
# Don't fail, because the PR for which this script runs can't fix it,
# it has to be fixed in the base branch
continue
fi
# The first regex match is everything after the @
entry=${BASH_REMATCH[1]}
if [[ "$entry" =~ (.*)/(.*) ]]; then
# Teams look like $org/$team
org=${BASH_REMATCH[1]}
team=${BASH_REMATCH[2]}
# Instead of requesting a review from the team itself,
# we request reviews from the individual users.
# This is because once somebody from a team reviewed the PR,
# the API doesn't expose that the team was already requested for a review,
# so we wouldn't be able to avoid rerequesting reviews
# without saving some some extra state somewhere
# We could also consider implementing a more advanced heuristic
# in the future that e.g. only pings one team member,
# but escalates to somebody else if that member doesn't respond in time.
gh api \
--cache=1h \
-H "Accept: application/vnd.github+json" \
-H "X-GitHub-Api-Version: 2022-11-28" \
"/orgs/$org/teams/$team/members" \
--jq '.[].login' > "$tmp/team-members"
readarray -t members < "$tmp/team-members"
log "Team $entry has these members: ${members[*]}"
for user in "${members[@]}"; do
users[${user,,}]=
done
else
# Everything else is a user
users[${entry,,}]=
fi
done
done
# Cannot request a review from the author
if [[ -v users[${prAuthor,,}] ]]; then
log "One or more files are owned by the PR author, ignoring"
unset 'users[${prAuthor,,}]'
fi
gh api \
-H "Accept: application/vnd.github+json" \
-H "X-GitHub-Api-Version: 2022-11-28" \
"/repos/$baseRepo/pulls/$prNumber/reviews" \
--jq '.[].user.login' > "$tmp/already-reviewed-by"
# And we don't want to rerequest reviews from people who already reviewed
while read -r user; do
if [[ -v users[${user,,}] ]]; then
log "User $user is a code owner but has already left a review, ignoring"
unset 'users[${user,,}]'
fi
done < "$tmp/already-reviewed-by"
# Turn it into a JSON for the GitHub API call to request PR reviewers
jq -n \
--arg users "${!users[*]}" \
'{
reviewers: $users | split(" "),
}'