103 lines
3.5 KiB
JavaScript
103 lines
3.5 KiB
JavaScript
/**
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* @license
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* Copyright Google LLC All Rights Reserved.
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*
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* Use of this source code is governed by an MIT-style license that can be
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* found in the LICENSE file at https://angular.io/license
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*/
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/**
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* **Usage:**
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* ```
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* node rebase-pr <github-repository> <pull-request-number>
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* ```
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* **Example:**
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* ```
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* node rebase-pr angular/angular 123
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* ```
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*
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* Rebases the current branch on top of the GitHub PR target branch.
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*
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* **Context:**
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* Since a GitHub PR is not necessarily up to date with its target branch, it is useful to rebase
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* prior to testing it on CI to ensure more up to date test results.
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*
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* **Implementation details:**
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* This script obtains the base for a GitHub PR via the
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* [GitHub PR API](https://developer.github.com/v3/pulls/#get-a-single-pull-request), then
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* fetches that branch, and rebases the current branch on top of it.
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*
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* **NOTE:**
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* This script cannot use external dependencies or be compiled because it needs to run before the
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* environment is setup.
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* Use only features supported by the NodeJS versions used in the environment.
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*/
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// This script uses `console` to print messages to the user.
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// tslint:disable:no-console
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// Imports
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const util = require('util');
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const child_process = require('child_process');
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const exec = util.promisify(child_process.exec);
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const getRefsAndShasForChange = require('./utils/git-get-changeset-refs');
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// Run
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_main().catch(err => {
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console.log('Failed to rebase on top of target branch.\n');
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console.error(err);
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process.exitCode = 1;
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});
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// Helpers
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async function _main() {
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const refs = await getRefsAndShasForChange();
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// Log known refs and shas
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console.log(`--------------------------------`);
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console.log(` Target Branch: ${refs.base.ref}`);
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console.log(` Latest Commit for Target Branch: ${refs.target.latestSha}`);
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console.log(` Latest Commit for PR: ${refs.base.latestSha}`);
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console.log(` First Common Ancestor SHA: ${refs.commonAncestorSha}`);
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console.log(`--------------------------------`);
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console.log();
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// Get the count of commits between the latest commit from origin and the common ancestor SHA.
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const {stdout: commitCount} =
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await exec(`git rev-list --count origin/${refs.base.ref}...${refs.commonAncestorSha}`);
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console.log(`Checking ${commitCount.trim()} commits for changes in the CircleCI config file.`);
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// Check if the files changed between the latest commit from origin and the common ancestor SHA
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// includes the CircleCI config.
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const {stdout: circleCIConfigChanged} = await exec(`git diff --name-only origin/${
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refs.base.ref} ${refs.commonAncestorSha} -- .circleci/config.yml`);
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if (!!circleCIConfigChanged) {
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throw Error(`
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CircleCI config on ${refs.base.ref} has been modified since commit ${
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refs.commonAncestorSha.slice(0, 7)},
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which this PR is based on.
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Please rebase the PR on ${refs.base.ref} after fetching from upstream.
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Rebase instructions for PR Author, please run the following commands:
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git fetch upstream ${refs.base.ref};
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git checkout ${refs.target.ref};
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git rebase upstream/${refs.base.ref};
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git push --force-with-lease;
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`);
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} else {
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console.log('No change found in the CircleCI config file, continuing.');
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}
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console.log();
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// Rebase the PR.
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console.log(`Rebasing current branch on ${refs.base.ref}.`);
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await exec(`git rebase origin/${refs.base.ref}`);
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console.log('Rebase successful.');
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}
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