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246 lines
7.8 KiB
246 lines
7.8 KiB
'use strict'
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const fs = require('graceful-fs')
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const path = require('path')
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const mkdirp = require('../mkdirs').mkdirs
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const pathExists = require('../path-exists').pathExists
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const utimes = require('../util/utimes').utimesMillis
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const notExist = Symbol('notExist')
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function copy (src, dest, opts, cb) {
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if (typeof opts === 'function' && !cb) {
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cb = opts
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opts = {}
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} else if (typeof opts === 'function') {
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opts = {filter: opts}
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}
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cb = cb || function () {}
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opts = opts || {}
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opts.clobber = 'clobber' in opts ? !!opts.clobber : true // default to true for now
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opts.overwrite = 'overwrite' in opts ? !!opts.overwrite : opts.clobber // overwrite falls back to clobber
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// Warn about using preserveTimestamps on 32-bit node
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if (opts.preserveTimestamps && process.arch === 'ia32') {
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console.warn(`fs-extra: Using the preserveTimestamps option in 32-bit node is not recommended;\n
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see https://github.com/jprichardson/node-fs-extra/issues/269`)
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}
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checkPaths(src, dest, (err, destStat) => {
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if (err) return cb(err)
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if (opts.filter) return handleFilter(checkParentDir, destStat, src, dest, opts, cb)
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return checkParentDir(destStat, src, dest, opts, cb)
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})
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}
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function checkParentDir (destStat, src, dest, opts, cb) {
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const destParent = path.dirname(dest)
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pathExists(destParent, (err, dirExists) => {
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if (err) return cb(err)
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if (dirExists) return startCopy(destStat, src, dest, opts, cb)
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mkdirp(destParent, err => {
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if (err) return cb(err)
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return startCopy(destStat, src, dest, opts, cb)
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})
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})
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}
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function handleFilter (onInclude, destStat, src, dest, opts, cb) {
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Promise.resolve(opts.filter(src, dest)).then(include => {
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if (include) {
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if (destStat) return onInclude(destStat, src, dest, opts, cb)
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return onInclude(src, dest, opts, cb)
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}
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return cb()
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}, error => cb(error))
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}
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function startCopy (destStat, src, dest, opts, cb) {
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if (opts.filter) return handleFilter(getStats, destStat, src, dest, opts, cb)
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return getStats(destStat, src, dest, opts, cb)
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}
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function getStats (destStat, src, dest, opts, cb) {
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const stat = opts.dereference ? fs.stat : fs.lstat
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stat(src, (err, srcStat) => {
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if (err) return cb(err)
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if (srcStat.isDirectory()) return onDir(srcStat, destStat, src, dest, opts, cb)
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else if (srcStat.isFile() ||
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srcStat.isCharacterDevice() ||
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srcStat.isBlockDevice()) return onFile(srcStat, destStat, src, dest, opts, cb)
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else if (srcStat.isSymbolicLink()) return onLink(destStat, src, dest, opts, cb)
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})
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}
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function onFile (srcStat, destStat, src, dest, opts, cb) {
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if (destStat === notExist) return copyFile(srcStat, src, dest, opts, cb)
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return mayCopyFile(srcStat, src, dest, opts, cb)
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}
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function mayCopyFile (srcStat, src, dest, opts, cb) {
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if (opts.overwrite) {
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fs.unlink(dest, err => {
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if (err) return cb(err)
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return copyFile(srcStat, src, dest, opts, cb)
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})
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} else if (opts.errorOnExist) {
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return cb(new Error(`'${dest}' already exists`))
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} else return cb()
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}
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function copyFile (srcStat, src, dest, opts, cb) {
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if (typeof fs.copyFile === 'function') {
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return fs.copyFile(src, dest, err => {
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if (err) return cb(err)
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return setDestModeAndTimestamps(srcStat, dest, opts, cb)
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})
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}
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return copyFileFallback(srcStat, src, dest, opts, cb)
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}
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function copyFileFallback (srcStat, src, dest, opts, cb) {
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const rs = fs.createReadStream(src)
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rs.on('error', err => cb(err)).once('open', () => {
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const ws = fs.createWriteStream(dest, { mode: srcStat.mode })
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ws.on('error', err => cb(err))
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.on('open', () => rs.pipe(ws))
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.once('close', () => setDestModeAndTimestamps(srcStat, dest, opts, cb))
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})
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}
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function setDestModeAndTimestamps (srcStat, dest, opts, cb) {
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fs.chmod(dest, srcStat.mode, err => {
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if (err) return cb(err)
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if (opts.preserveTimestamps) {
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return utimes(dest, srcStat.atime, srcStat.mtime, cb)
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}
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return cb()
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})
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}
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function onDir (srcStat, destStat, src, dest, opts, cb) {
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if (destStat === notExist) return mkDirAndCopy(srcStat, src, dest, opts, cb)
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if (destStat && !destStat.isDirectory()) {
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return cb(new Error(`Cannot overwrite non-directory '${dest}' with directory '${src}'.`))
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}
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return copyDir(src, dest, opts, cb)
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}
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function mkDirAndCopy (srcStat, src, dest, opts, cb) {
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fs.mkdir(dest, err => {
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if (err) return cb(err)
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copyDir(src, dest, opts, err => {
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if (err) return cb(err)
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return fs.chmod(dest, srcStat.mode, cb)
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})
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})
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}
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function copyDir (src, dest, opts, cb) {
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fs.readdir(src, (err, items) => {
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if (err) return cb(err)
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return copyDirItems(items, src, dest, opts, cb)
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})
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}
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function copyDirItems (items, src, dest, opts, cb) {
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const item = items.pop()
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if (!item) return cb()
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return copyDirItem(items, item, src, dest, opts, cb)
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}
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function copyDirItem (items, item, src, dest, opts, cb) {
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const srcItem = path.join(src, item)
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const destItem = path.join(dest, item)
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checkPaths(srcItem, destItem, (err, destStat) => {
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if (err) return cb(err)
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startCopy(destStat, srcItem, destItem, opts, err => {
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if (err) return cb(err)
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return copyDirItems(items, src, dest, opts, cb)
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})
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})
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}
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function onLink (destStat, src, dest, opts, cb) {
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fs.readlink(src, (err, resolvedSrc) => {
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if (err) return cb(err)
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if (opts.dereference) {
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resolvedSrc = path.resolve(process.cwd(), resolvedSrc)
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}
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if (destStat === notExist) {
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return fs.symlink(resolvedSrc, dest, cb)
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} else {
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fs.readlink(dest, (err, resolvedDest) => {
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if (err) {
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// dest exists and is a regular file or directory,
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// Windows may throw UNKNOWN error. If dest already exists,
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// fs throws error anyway, so no need to guard against it here.
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if (err.code === 'EINVAL' || err.code === 'UNKNOWN') return fs.symlink(resolvedSrc, dest, cb)
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return cb(err)
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}
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if (opts.dereference) {
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resolvedDest = path.resolve(process.cwd(), resolvedDest)
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}
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if (isSrcSubdir(resolvedSrc, resolvedDest)) {
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return cb(new Error(`Cannot copy '${resolvedSrc}' to a subdirectory of itself, '${resolvedDest}'.`))
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}
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// do not copy if src is a subdir of dest since unlinking
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// dest in this case would result in removing src contents
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// and therefore a broken symlink would be created.
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if (destStat.isDirectory() && isSrcSubdir(resolvedDest, resolvedSrc)) {
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return cb(new Error(`Cannot overwrite '${resolvedDest}' with '${resolvedSrc}'.`))
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}
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return copyLink(resolvedSrc, dest, cb)
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})
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}
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})
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}
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function copyLink (resolvedSrc, dest, cb) {
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fs.unlink(dest, err => {
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if (err) return cb(err)
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return fs.symlink(resolvedSrc, dest, cb)
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})
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}
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// return true if dest is a subdir of src, otherwise false.
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function isSrcSubdir (src, dest) {
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const srcArray = path.resolve(src).split(path.sep)
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const destArray = path.resolve(dest).split(path.sep)
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return srcArray.reduce((acc, current, i) => acc && destArray[i] === current, true)
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}
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function checkStats (src, dest, cb) {
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fs.stat(src, (err, srcStat) => {
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if (err) return cb(err)
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fs.stat(dest, (err, destStat) => {
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if (err) {
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if (err.code === 'ENOENT') return cb(null, {srcStat, destStat: notExist})
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return cb(err)
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}
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return cb(null, {srcStat, destStat})
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})
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})
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}
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function checkPaths (src, dest, cb) {
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checkStats(src, dest, (err, stats) => {
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if (err) return cb(err)
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const {srcStat, destStat} = stats
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if (destStat.ino && destStat.ino === srcStat.ino) {
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return cb(new Error('Source and destination must not be the same.'))
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}
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if (srcStat.isDirectory() && isSrcSubdir(src, dest)) {
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return cb(new Error(`Cannot copy '${src}' to a subdirectory of itself, '${dest}'.`))
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}
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return cb(null, destStat)
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})
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}
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module.exports = copy
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