add reviewer, approve, and merge a PR via GH api

approve-merge.sh

#!/bin/bash
#
# Copyright (c) 2021 Red Hat, Inc.
# This program and the accompanying materials are made
# available under the terms of the Eclipse Public License 2.0
# which is available at https://www.eclipse.org/legal/epl-2.0/
#
# SPDX-License-Identifier: EPL-2.0
#
# Contributors:
#   Red Hat, Inc. - initial API and implementation
#
# push locally built asset* files to github

set -e

# defaults

usageGHT() {
    echo 'Setup:

First, export your GITHUB_TOKEN:

  export GITHUB_TOKEN="...github-token..."
'
  usage
}
usage () {
    echo "
Usage:
  $0 -u GITHUB_USER https://github.com/[org]/[project]/pull/[pr-num1] [https://github.com/[org]/[project]/pull/[pr-num2] ...]
"
}

while [[ "$#" -gt 0 ]]; do
  case $1 in
    '-ght') GITHUB_TOKEN="$2"; export GITHUB_TOKEN="${GITHUB_TOKEN}"; shift 1;;
    '-u') GITHUB_USERNAME="$2"; shift 1;;
    '-h'|'--help') usageGHT; exit 0;;
    *) URLs="${URLs} $1";;
  esac
  shift 1
done

if [[ ! "${GITHUB_TOKEN}" ]]; then usageGHT; exit 1; fi
if [[ ! "${GITHUB_USERNAME}" ]]; then usage; exit 1; fi

for URL in $URLs; do
    # compute org, repo, and PR number
    # URL=https://github.com/eclipse-che/che-server/pull/220#pullrequestreview-838533873
    URL=${URL%%#*}; URL=${URL##*:}; URL=${URL##*github.com/}; # echo $URL # eclipse-che/che-server/pull/220
    orgAndRepo=${URL%/pull/*}; # echo $orgAndRepo # eclipse-che/che-server
    PR=${URL#*/pull/}; # echo $PR # 220

    # Run 3 steps:
    curlAuthPostJSON="curl -sS -u ${GITHUB_USERNAME}:$GITHUB_TOKEN -X POST -H \"Accept: application/vnd.github.v3+json\""
    # add reviewer to PR
    $curlAuthPostJSON https://api.github.com/repos/${orgAndRepo}/pulls/${PR}/requested_reviewers \
    -d '{"reviewers":["'${GITHUB_USERNAME}'"]}' \
    | jq -r '.requested_reviewers[].login'

    # approve PR
    $curlAuthPostJSON https://api.github.com/repos/${orgAndRepo}/pulls/${PR}/reviews \
    -d '{"body":"approved via API", "event":"APPROVE"}' \
    | jq -r '[.state,.body,.html_url] | @tsv'
    
    # wait for ECA aproval
    sleep 5s 

    # merge PR (assuming no required PR checks are still running)
    curlAuthPutJSON="curl -sS -u ${GITHUB_USERNAME}:$GITHUB_TOKEN -X PUT -H \"Accept: application/vnd.github.v3+json\""
    $curlAuthPutJSON https://api.github.com/repos/${orgAndRepo}/pulls/${PR}/merge \
    -d '{"commit_message":"merged by API", "merge_method":"squash"}' 
    echo

done