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'use strict' const path = require('path') const fs = require('graceful-fs') const chain = require('slide').chain const mkdir = require('./mkdir.js') const rm = require('./rm.js') const inferOwner = require('infer-owner') const chown = require('./chown.js') exports = module.exports = { link: link, linkIfExists: linkIfExists } function linkIfExists (from, to, opts, cb) { opts.currentIsLink = false opts.currentExists = false fs.stat(from, function (er) { if (er) return cb() fs.readlink(to, function (er, fromOnDisk) { if (!er || er.code !== 'ENOENT') { opts.currentExists = true } // if the link already exists and matches what we would do, // we don't need to do anything if (!er) { opts.currentIsLink = true var toDir = path.dirname(to) var absoluteFrom = path.resolve(toDir, from) var absoluteFromOnDisk = path.resolve(toDir, fromOnDisk) opts.currentTarget = absoluteFromOnDisk 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 const tasks = [ [ensureFromIsNotSource, absTarget, to], [fs, 'stat', absTarget], [clobberLinkGently, from, to, opts], [mkdir, path.dirname(to)], [fs, 'symlink', target, to, 'junction'] ] if (chown.selfOwner.uid !== 0) { chain(tasks, cb) } else { inferOwner(to).then(owner => { tasks.push([chown, to, owner.uid, owner.gid]) chain(tasks, cb) }) } } exports._clobberLinkGently = clobberLinkGently function clobberLinkGently (from, to, opts, cb) { if (opts.currentExists === false) { // nothing to clobber! opts.log.silly('gently link', 'link does not already exist', { link: to, target: from }) return cb() } if (!opts.clobberLinkGently || opts.force === true || !opts.gently || typeof opts.gently !== 'string') { opts.log.silly('gently link', 'deleting existing link forcefully', { link: to, target: from, force: opts.force, gently: opts.gently, clobberLinkGently: opts.clobberLinkGently }) return rm(to, opts, cb) } if (!opts.currentIsLink) { opts.log.verbose('gently link', 'cannot remove, not a link', to) // don't delete. it'll fail with EEXIST when it tries to symlink. return cb() } if (opts.currentTarget.indexOf(opts.gently) === 0) { opts.log.silly('gently link', 'delete existing link', to) return rm(to, opts, cb) } else { opts.log.verbose('gently link', 'refusing to delete existing link', { link: to, currentTarget: opts.currentTarget, newTarget: from, gently: opts.gently }) return cb() } }
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