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'use strict'
const fs = require('graceful-fs')
const path = require('path')
const mkdirpSync = require('../mkdirs').mkdirsSync
const utimesSync = require('../util/utimes.js').utimesMillisSync
const notExist = Symbol('notExist')
const existsReg = Symbol('existsReg')
function copySync (src, dest, opts) {
if (typeof opts === 'function') {
opts = {filter: opts}
}
opts = opts || {}
opts.clobber = 'clobber' in opts ? !!opts.clobber : true // default to true for now
opts.overwrite = 'overwrite' in opts ? !!opts.overwrite : opts.clobber // overwrite falls back to clobber
// Warn about using preserveTimestamps on 32-bit node
if (opts.preserveTimestamps && process.arch === 'ia32') {
console.warn(`fs-extra: Using the preserveTimestamps option in 32-bit node is not recommended;\n
see https://github.com/jprichardson/node-fs-extra/issues/269`)
}
src = path.resolve(src)
dest = path.resolve(dest)
// don't allow src and dest to be the same
if (src === dest) throw new Error('Source and destination must not be the same.')
if (opts.filter && !opts.filter(src, dest)) return
const destParent = path.dirname(dest)
if (!fs.existsSync(destParent)) mkdirpSync(destParent)
return startCopy(src, dest, opts)
}
function startCopy (src, dest, opts) {
if (opts.filter && !opts.filter(src, dest)) return
return getStats(src, dest, opts)
}
function getStats (src, dest, opts) {
const statSync = opts.dereference ? fs.statSync : fs.lstatSync
const st = statSync(src)
if (st.isDirectory()) return onDir(st, src, dest, opts)
else if (st.isFile() ||
st.isCharacterDevice() ||
st.isBlockDevice()) return onFile(st, src, dest, opts)
else if (st.isSymbolicLink()) return onLink(src, dest, opts)
}
function onFile (srcStat, src, dest, opts) {
const resolvedPath = checkDest(dest)
if (resolvedPath === notExist) {
return copyFile(srcStat, src, dest, opts)
} else if (resolvedPath === existsReg) {
return mayCopyFile(srcStat, src, dest, opts)
} else {
if (src === resolvedPath) return
return mayCopyFile(srcStat, src, dest, opts)
}
}
function mayCopyFile (srcStat, src, dest, opts) {
if (opts.overwrite) {
fs.unlinkSync(dest)
return copyFile(srcStat, src, dest, opts)
} else if (opts.errorOnExist) {
throw new Error(`'${dest}' already exists`)
}
}
function copyFile (srcStat, src, dest, opts) {
if (typeof fs.copyFileSync === 'function') {
fs.copyFileSync(src, dest)
fs.chmodSync(dest, srcStat.mode)
if (opts.preserveTimestamps) {
return utimesSync(dest, srcStat.atime, srcStat.mtime)
}
return
}
return copyFileFallback(srcStat, src, dest, opts)
}
function copyFileFallback (srcStat, src, dest, opts) {
const BUF_LENGTH = 64 * 1024
const _buff = require('../util/buffer')(BUF_LENGTH)
const fdr = fs.openSync(src, 'r')
const fdw = fs.openSync(dest, 'w', srcStat.mode)
let bytesRead = 1
let pos = 0
while (bytesRead > 0) {
bytesRead = fs.readSync(fdr, _buff, 0, BUF_LENGTH, pos)
fs.writeSync(fdw, _buff, 0, bytesRead)
pos += bytesRead
}
if (opts.preserveTimestamps) fs.futimesSync(fdw, srcStat.atime, srcStat.mtime)
fs.closeSync(fdr)
fs.closeSync(fdw)
}
function onDir (srcStat, src, dest, opts) {
const resolvedPath = checkDest(dest)
if (resolvedPath === notExist) {
if (isSrcSubdir(src, dest)) {
throw new Error(`Cannot copy '${src}' to a subdirectory of itself, '${dest}'.`)
}
return mkDirAndCopy(srcStat, src, dest, opts)
} else if (resolvedPath === existsReg) {
if (isSrcSubdir(src, dest)) {
throw new Error(`Cannot copy '${src}' to a subdirectory of itself, '${dest}'.`)
}
return mayCopyDir(src, dest, opts)
} else {
if (src === resolvedPath) return
return copyDir(src, dest, opts)
}
}
function mayCopyDir (src, dest, opts) {
if (!fs.statSync(dest).isDirectory()) {
throw new Error(`Cannot overwrite non-directory '${dest}' with directory '${src}'.`)
}
return copyDir(src, dest, opts)
}
function mkDirAndCopy (srcStat, src, dest, opts) {
fs.mkdirSync(dest, srcStat.mode)
fs.chmodSync(dest, srcStat.mode)
return copyDir(src, dest, opts)
}
function copyDir (src, dest, opts) {
fs.readdirSync(src).forEach(item => {
startCopy(path.join(src, item), path.join(dest, item), opts)
})
}
function onLink (src, dest, opts) {
let resolvedSrcPath = fs.readlinkSync(src)
if (opts.dereference) {
resolvedSrcPath = path.resolve(process.cwd(), resolvedSrcPath)
}
let resolvedDestPath = checkDest(dest)
if (resolvedDestPath === notExist || resolvedDestPath === existsReg) {
// if dest already exists, fs throws error anyway,
// so no need to guard against it here.
return fs.symlinkSync(resolvedSrcPath, dest)
} else {
if (opts.dereference) {
resolvedDestPath = path.resolve(process.cwd(), resolvedDestPath)
}
if (resolvedDestPath === resolvedSrcPath) return
// prevent copy if src is a subdir of dest since unlinking
// dest in this case would result in removing src contents
// and therefore a broken symlink would be created.
if (fs.statSync(dest).isDirectory() && isSrcSubdir(resolvedDestPath, resolvedSrcPath)) {
throw new Error(`Cannot overwrite '${resolvedDestPath}' with '${resolvedSrcPath}'.`)
}
return copyLink(resolvedSrcPath, dest)
}
}
function copyLink (resolvedSrcPath, dest) {
fs.unlinkSync(dest)
return fs.symlinkSync(resolvedSrcPath, dest)
}
// check if dest exists and/or is a symlink
function checkDest (dest) {
let resolvedPath
try {
resolvedPath = fs.readlinkSync(dest)
} catch (err) {
if (err.code === 'ENOENT') return notExist
// dest exists and is a regular file or directory, Windows may throw UNKNOWN error
if (err.code === 'EINVAL' || err.code === 'UNKNOWN') return existsReg
throw err
}
return resolvedPath // dest exists and is a symlink
}
// return true if dest is a subdir of src, otherwise false.
// extract dest base dir and check if that is the same as src basename
function isSrcSubdir (src, dest) {
const baseDir = dest.split(path.dirname(src) + path.sep)[1]
if (baseDir) {
const destBasename = baseDir.split(path.sep)[0]
if (destBasename) {
return src !== dest && dest.indexOf(src) > -1 && destBasename === path.basename(src)
}
return false
}
return false
}
module.exports = copySync
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