* @param {string[]} files - the gitStream's files context variable
 * @param {Object} pr - the gitStream's pr context variable
 * @param {string} token - access token with repo:read scope, used to read the CODEOWNERS file
 * @param {string} pathToCodeOwners - path from repo root to CODEOWNERS file
 * @returns {Map} - Map from owner name to list of files they own

			link(path, link, callback) { callback(enosys()); },
			lstat(path, callback) { callback(enosys()); },
			mkdir(path, perm, callback) { callback(enosys()); },
			open(path, flags, mode, callback) { callback(enosys()); },
			read(fd, buffer, offset, length, position, callback) { callback(enosys()); },
			readdir(path, callback) { callback(enosys()); },
			readlink(path, callback) { callback(enosys()); },
			rename(from, to, callback) { callback(enosys()); },

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/**
* @preserve HTML5 Shiv 3.7.3 | @afarkas @jdalton @jon_neal @rem | MIT/GPL2 Licensed
*/

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,d)},100);var e=function(b,c){var e=a.split(b),f=e.length,g=function(){f--,0===f&&(a.formUtils.isLoadingModules=!1,"function"==typeof d&&d())};f>0&&(a.formUtils.isLoadingModules=!0);var h="?_="+(new Date).getTime(),i=document.getElementsByTagName("head")[0]||document.getElementsByTagName("body")[0];a.each(e,function(b,d){if(d=a.trim(d),0===d.length||a.formUtils.hasLoadedModule(d))g();else{var e=c+d+(".js"===d.slice(-3)?"":".js"),f=document.createElement("SCRIPT");"function"==typeof define&&defin...

*/
module.exports = async ({github, context}) => {
  const rollback_commit = context.payload.head_commit.id;
  const pr_match_groups = context.payload.head_commit.message.match(/\Rollback of PR #(\d+).*/) || [];
  if (pr_match_groups.length != 2) {
    console.log(`PR Number not found in ${context.payload.head_commit.message}`);
    throw "Error extracting PR Number from commit message";
  }

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