87 lines
2.6 KiB
Bash
Executable file
87 lines
2.6 KiB
Bash
Executable file
#!/usr/bin/env bash
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# Get the code owners of the files changed by a PR,
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# suitable to be consumed by the API endpoint to request reviews:
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# https://docs.github.com/en/rest/pulls/review-requests?apiVersion=2022-11-28#request-reviewers-for-a-pull-request
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set -euo pipefail
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log() {
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echo "$@" >&2
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}
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if (( "$#" < 5 )); then
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log "Usage: $0 GIT_REPO BASE_REF HEAD_REF OWNERS_FILE PR_AUTHOR"
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exit 1
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fi
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gitRepo=$1
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baseRef=$2
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headRef=$3
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ownersFile=$4
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prAuthor=$5
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tmp=$(mktemp -d)
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trap 'rm -rf "$tmp"' exit
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git -C "$gitRepo" diff --name-only --merge-base "$baseRef" "$headRef" > "$tmp/touched-files"
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readarray -t touchedFiles < "$tmp/touched-files"
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log "This PR touches ${#touchedFiles[@]} files"
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# Get the owners file from the base, because we don't want to allow PRs to
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# remove code owners to avoid pinging them
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git -C "$gitRepo" show "$baseRef":"$ownersFile" > "$tmp"/codeowners
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# Associative arrays with the team/user as the key for easy deduplication
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declare -A teams users
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for file in "${touchedFiles[@]}"; do
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result=$(codeowners --file "$tmp"/codeowners "$file")
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read -r file owners <<< "$result"
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if [[ "$owners" == "(unowned)" ]]; then
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log "File $file is unowned"
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continue
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fi
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log "File $file is owned by $owners"
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# Split up multiple owners, separated by arbitrary amounts of spaces
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IFS=" " read -r -a entries <<< "$owners"
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for entry in "${entries[@]}"; do
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# GitHub technically also supports Emails as code owners,
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# but we can't easily support that, so let's not
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if [[ ! "$entry" =~ @(.*) ]]; then
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warn -e "\e[33mCodeowner \"$entry\" for file $file is not valid: Must start with \"@\"\e[0m" >&2
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# Don't fail, because the PR for which this script runs can't fix it,
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# it has to be fixed in the base branch
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continue
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fi
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# The first regex match is everything after the @
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entry=${BASH_REMATCH[1]}
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if [[ "$entry" =~ .*/(.*) ]]; then
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# Teams look like $org/$team, where we only need $team for the API
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# call to request reviews from teams
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teams[${BASH_REMATCH[1]}]=
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else
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# Everything else is a user
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users[$entry]=
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fi
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done
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done
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# Cannot request a review from the author
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if [[ -v users[$prAuthor] ]]; then
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log "One or more files are owned by the PR author, ignoring"
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unset 'users[$prAuthor]'
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fi
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# Turn it into a JSON for the GitHub API call to request PR reviewers
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jq -n \
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--arg users "${!users[*]}" \
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--arg teams "${!teams[*]}" \
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'{
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reviewers: $users | split(" "),
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team_reviewers: $teams | split(" ")
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}'
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