37 lines
1.4 KiB
JavaScript
37 lines
1.4 KiB
JavaScript
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#!/usr/bin/env node
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'use strict';
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/**
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* **Usage:**
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* ```
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* node get-vendored-yarn-path
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* ```
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*
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* Returns the path to the vendored `yarn.js` script, so that it can be used for setting up yarn
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* aliases/symlinks and use the local, vendored yarn script instead of a globally installed one.
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*
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* **Context:**
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* We keep a version of yarn in the repo, at `third_party/github.com/yarnpkg/`. All CI jobs should
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* use that version for consistency (and easier updates). The path to the actual `yarn.js` script,
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* however, changes depending on the version (e.g. `third_party/github.com/yarnpkg/v1.21.1/...`).
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*
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* This script infers the correct path, so that we don't have to update the path in several places,
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* when we update the version of yarn in `third_party/github.com/yarnpkg/`.
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*/
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const {readdirSync} = require('fs');
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const {normalize} = require('path');
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const yarnDownloadDir = `${__dirname}/../third_party/github.com/yarnpkg/yarn/releases/download`;
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const yarnVersionSubdirs = readdirSync(yarnDownloadDir);
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// Based on our current process, there should be exactly one sub-directory inside
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// `vendoredYarnDownloadDir` at all times. Throw, if that is not the case.
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if (yarnVersionSubdirs.length !== 1) {
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throw new Error(
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`Expected exactly 1 yarn version in '${yarnDownloadDir}', but found ` +
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`${yarnVersionSubdirs.length}: ${yarnVersionSubdirs.join(', ')}`);
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}
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console.log(normalize(`${yarnDownloadDir}/${yarnVersionSubdirs[0]}/bin/yarn.js`));
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