angular-cn/tools/utils/get-refs-and-shas-for-targe...

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/**
* @license
* Copyright Google Inc. All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
// This script uses `console` to print messages to the user.
// tslint:disable:no-console
const https = require('https');
const util = require('util');
const child_process = require('child_process');
const exec = util.promisify(child_process.exec);
async function requestDataFromGithub(url) {
// GitHub requires a user agent: https://developer.github.com/v3/#user-agent-required
const options = {headers: {'User-Agent': 'angular'}};
return new Promise((resolve, reject) => {
https
.get(
url, options,
(res) => {
const {statusCode} = res;
const contentType = res.headers['content-type'];
let rawData = '';
res.on('data', (chunk) => { rawData += chunk; });
res.on('end', () => {
let error;
if (statusCode !== 200) {
error = new Error(
`Request Failed.\nStatus Code: ${statusCode}.\nResponse: ${rawData}`);
} else if (!/^application\/json/.test(contentType)) {
error = new Error(
'Invalid content-type.\n' +
`Expected application/json but received ${contentType}`);
}
if (error) {
reject(error);
return;
}
try {
resolve(JSON.parse(rawData));
} catch (e) {
reject(e);
}
});
})
.on('error', (e) => { reject(e); });
});
}
module.exports = async function getRefsAndShasForTarget(prNumber) {
console.log(`Getting refs and SHAs for PR ${prNumber} on angular/angular.`);
const pullsUrl = `https://api.github.com/repos/angular/angular/pulls/${prNumber}`;
const result = await requestDataFromGithub(pullsUrl);
// Ensure the base ref is up to date
await exec(`git fetch origin ${result.base.ref}`);
// The sha of the latest commit on the target branch.
const {stdout: latestShaOfTargetBranch} = await exec(`git rev-parse origin/${result.base.ref}`);
// The sha of the latest commit on the PR.
const {stdout: latestShaOfPrBranch} = await exec(`git rev-parse HEAD`);
// The first common SHA in the history of the target branch and the latest commit in the PR.
const {stdout: commonAncestorSha} =
await exec(`git merge-base origin/${result.base.ref} ${latestShaOfPrBranch}`);
const output = {
base: {
ref: result.base.ref,
sha: result.base.sha,
},
head: {
ref: result.head.ref,
sha: result.head.sha,
},
commonAncestorSha: commonAncestorSha.trim(),
latestShaOfTargetBranch: latestShaOfTargetBranch.trim(),
latestShaOfPrBranch: latestShaOfPrBranch.trim(),
};
return output;
};