61 lines
2.3 KiB
JavaScript
61 lines
2.3 KiB
JavaScript
// This file is a bit weird, so let me explain with some context: we're working
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// to implement a tool called "Corepack" in Node. This tool will allow us to
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// provide a Yarn shim to everyone using Node, meaning that they won't need to
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// run `npm install -g yarn`.
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//
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// Still, we don't want to break the experience of people that already use `npm
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// install -g yarn`! And one annoying thing with npm is that they install their
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// binaries directly inside the Node bin/ folder. And Because of this, they
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// refuse to overwrite binaries when they detect they don't belong to npm. Which
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// means that, since the "yarn" Corepack symlink belongs to Corepack and not npm,
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// running `npm install -g yarn` would crash by refusing to override the binary :/
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//
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// And thus we have this preinstall script, which checks whether Yarn is being
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// installed as a global binary, and remove the existing symlink if it detects
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// it belongs to Corepack. Since preinstall scripts run, in npm, before the global
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// symlink is created, we bypass this way the ownership check.
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//
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// More info:
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// https://github.com/arcanis/pmm/issues/6
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if (process.env.npm_config_global) {
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var cp = require('child_process');
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var fs = require('fs');
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var path = require('path');
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try {
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var targetPath = cp.execFileSync(process.execPath, [process.env.npm_execpath, 'bin', '-g'], {
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encoding: 'utf8',
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stdio: ['ignore', undefined, 'ignore'],
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}).replace(/\n/g, '');
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var manifest = require('./package.json');
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var binNames = typeof manifest.bin === 'string'
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? [manifest.name.replace(/^@[^\/]+\//, '')]
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: typeof manifest.bin === 'object' && manifest.bin !== null
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? Object.keys(manifest.bin)
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: [];
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binNames.forEach(function (binName) {
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var binPath = path.join(targetPath, binName);
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var binTarget;
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try {
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binTarget = fs.readlinkSync(binPath);
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} catch (err) {
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return;
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}
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if (binTarget.startsWith('../lib/node_modules/corepack/')) {
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try {
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fs.unlinkSync(binPath);
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} catch (err) {
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return;
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}
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}
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});
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} catch (err) {
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// ignore errors
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}
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}
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