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link.js
'use strict' const path = require('path') const fs = require('graceful-fs') const chain = require('slide').chain const mkdir = require('mkdirp') const rm = require('./rm.js') exports = module.exports = { link: link, linkIfExists: linkIfExists } function linkIfExists (from, to, opts, cb) { fs.stat(from, function (er) { if (er) return cb() fs.readlink(to, function (er, fromOnDisk) { // if the link already exists and matches what we would do, // we don't need to do anything if (!er) { var toDir = path.dirname(to) var absoluteFrom = path.resolve(toDir, from) var absoluteFromOnDisk = path.resolve(toDir, fromOnDisk) if (absoluteFrom === absoluteFromOnDisk) return cb() } link(from, to, opts, cb) }) }) } function resolveIfSymlink (maybeSymlinkPath, cb) { fs.lstat(maybeSymlinkPath, function (err, stat) { if (err) return cb.apply(this, arguments) if (!stat.isSymbolicLink()) return cb(null, maybeSymlinkPath) fs.readlink(maybeSymlinkPath, cb) }) } function ensureFromIsNotSource (from, to, cb) { resolveIfSymlink(from, function (err, fromDestination) { if (err) return cb.apply(this, arguments) if (path.resolve(path.dirname(from), fromDestination) === path.resolve(to)) { return cb(new Error('Link target resolves to the same directory as link source: ' + to)) } cb.apply(this, arguments) }) } function link (from, to, opts, cb) { to = path.resolve(to) opts.base = path.dirname(to) var absTarget = path.resolve(opts.base, from) var relativeTarget = path.relative(opts.base, absTarget) var target = opts.absolute ? absTarget : relativeTarget chain( [ [ensureFromIsNotSource, absTarget, to], [fs, 'stat', absTarget], [rm, to, opts], [mkdir, path.dirname(to)], [fs, 'symlink', target, to, 'junction'] ], cb ) }
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link.js
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2021-09-28 11:28:11
rm.js
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0644
2021-09-28 11:28:11