60 lines
1.6 KiB
JavaScript
60 lines
1.6 KiB
JavaScript
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/**
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* Copyright (c) 2015-present, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under the BSD-style license found in the
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* LICENSE file in the root directory of this source tree. An additional grant
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* of patent rights can be found in the PATENTS file in the same directory.
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*/
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const path = require('path');
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const fs = require('fs');
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/**
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* Find and resolve symlinks in `lookupFolder`.
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* Ignore any descendants of the paths in `ignoredRoots`.
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*/
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module.exports = function findSymlinksPaths(lookupFolder, ignoredRoots) {
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const timeStart = Date.now();
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const folders = fs.readdirSync(lookupFolder);
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const resolvedSymlinks = [];
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folders.forEach(folder => {
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const visited = [];
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let symlink = path.resolve(lookupFolder, folder);
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while (fs.lstatSync(symlink).isSymbolicLink()) {
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const index = visited.indexOf(symlink);
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if (index !== -1) {
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throw Error(
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'Infinite symlink recursion detected:\n ' +
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visited.slice(index).join('\n ')
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);
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}
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visited.push(symlink);
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symlink = path.resolve(
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path.dirname(symlink),
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fs.readlinkSync(symlink)
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);
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}
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if (visited.length && !rootExists(ignoredRoots, symlink)) {
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resolvedSymlinks.push(symlink);
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}
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});
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const timeEnd = Date.now();
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console.log(`Scanning ${folders.length} folders for symlinks in ${lookupFolder} (${timeEnd - timeStart}ms)`);
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return resolvedSymlinks;
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};
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function rootExists(roots, child) {
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return roots.some(root => isDescendant(root, child));
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}
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function isDescendant(root, child) {
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return root === child || child.startsWith(root + path.sep);
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}
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