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'use strict'
const fs = require('graceful-fs')
const path = require('path')
const mkdirp = require('../mkdirs').mkdirs
const pathExists = require('../path-exists').pathExists
const utimes = require('../util/utimes').utimesMillis
const notExist = Symbol('notExist')
const existsReg = Symbol('existsReg')
function copy (src, dest, opts, cb) {
if (typeof opts === 'function' && !cb) {
cb = opts
opts = {}
} else if (typeof opts === 'function') {
opts = {filter: opts}
}
cb = cb || function () {}
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) return cb(new Error('Source and destination must not be the same.'))
if (opts.filter) return handleFilter(checkParentDir, src, dest, opts, cb)
return checkParentDir(src, dest, opts, cb)
}
function checkParentDir (src, dest, opts, cb) {
const destParent = path.dirname(dest)
pathExists(destParent, (err, dirExists) => {
if (err) return cb(err)
if (dirExists) return startCopy(src, dest, opts, cb)
mkdirp(destParent, err => {
if (err) return cb(err)
return startCopy(src, dest, opts, cb)
})
})
}
function startCopy (src, dest, opts, cb) {
if (opts.filter) return handleFilter(getStats, src, dest, opts, cb)
return getStats(src, dest, opts, cb)
}
function handleFilter (onInclude, src, dest, opts, cb) {
Promise.resolve(opts.filter(src, dest))
.then(include => {
if (include) return onInclude(src, dest, opts, cb)
return cb()
}, error => cb(error))
}
function getStats (src, dest, opts, cb) {
const stat = opts.dereference ? fs.stat : fs.lstat
stat(src, (err, st) => {
if (err) return cb(err)
if (st.isDirectory()) return onDir(st, src, dest, opts, cb)
else if (st.isFile() ||
st.isCharacterDevice() ||
st.isBlockDevice()) return onFile(st, src, dest, opts, cb)
else if (st.isSymbolicLink()) return onLink(src, dest, opts, cb)
})
}
function onFile (srcStat, src, dest, opts, cb) {
checkDest(dest, (err, resolvedPath) => {
if (err) return cb(err)
if (resolvedPath === notExist) {
return copyFile(srcStat, src, dest, opts, cb)
} else if (resolvedPath === existsReg) {
return mayCopyFile(srcStat, src, dest, opts, cb)
} else {
if (src === resolvedPath) return cb()
return mayCopyFile(srcStat, src, dest, opts, cb)
}
})
}
function mayCopyFile (srcStat, src, dest, opts, cb) {
if (opts.overwrite) {
fs.unlink(dest, err => {
if (err) return cb(err)
return copyFile(srcStat, src, dest, opts, cb)
})
} else if (opts.errorOnExist) {
return cb(new Error(`'${dest}' already exists`))
} else return cb()
}
function copyFile (srcStat, src, dest, opts, cb) {
if (typeof fs.copyFile === 'function') {
return fs.copyFile(src, dest, err => {
if (err) return cb(err)
return setDestModeAndTimestamps(srcStat, dest, opts, cb)
})
}
return copyFileFallback(srcStat, src, dest, opts, cb)
}
function copyFileFallback (srcStat, src, dest, opts, cb) {
const rs = fs.createReadStream(src)
rs.on('error', err => cb(err))
.once('open', () => {
const ws = fs.createWriteStream(dest, { mode: srcStat.mode })
ws.on('error', err => cb(err))
.on('open', () => rs.pipe(ws))
.once('close', () => setDestModeAndTimestamps(srcStat, dest, opts, cb))
})
}
function setDestModeAndTimestamps (srcStat, dest, opts, cb) {
fs.chmod(dest, srcStat.mode, err => {
if (err) return cb(err)
if (opts.preserveTimestamps) {
return utimes(dest, srcStat.atime, srcStat.mtime, cb)
}
return cb()
})
}
function onDir (srcStat, src, dest, opts, cb) {
checkDest(dest, (err, resolvedPath) => {
if (err) return cb(err)
if (resolvedPath === notExist) {
if (isSrcSubdir(src, dest)) {
return cb(new Error(`Cannot copy '${src}' to a subdirectory of itself, '${dest}'.`))
}
return mkDirAndCopy(srcStat, src, dest, opts, cb)
} else if (resolvedPath === existsReg) {
if (isSrcSubdir(src, dest)) {
return cb(new Error(`Cannot copy '${src}' to a subdirectory of itself, '${dest}'.`))
}
return mayCopyDir(src, dest, opts, cb)
} else {
if (src === resolvedPath) return cb()
return copyDir(src, dest, opts, cb)
}
})
}
function mayCopyDir (src, dest, opts, cb) {
fs.stat(dest, (err, st) => {
if (err) return cb(err)
if (!st.isDirectory()) {
return cb(new Error(`Cannot overwrite non-directory '${dest}' with directory '${src}'.`))
}
return copyDir(src, dest, opts, cb)
})
}
function mkDirAndCopy (srcStat, src, dest, opts, cb) {
fs.mkdir(dest, srcStat.mode, err => {
if (err) return cb(err)
fs.chmod(dest, srcStat.mode, err => {
if (err) return cb(err)
return copyDir(src, dest, opts, cb)
})
})
}
function copyDir (src, dest, opts, cb) {
fs.readdir(src, (err, items) => {
if (err) return cb(err)
return copyDirItems(items, src, dest, opts, cb)
})
}
function copyDirItems (items, src, dest, opts, cb) {
const item = items.pop()
if (!item) return cb()
startCopy(path.join(src, item), path.join(dest, item), opts, err => {
if (err) return cb(err)
return copyDirItems(items, src, dest, opts, cb)
})
}
function onLink (src, dest, opts, cb) {
fs.readlink(src, (err, resolvedSrcPath) => {
if (err) return cb(err)
if (opts.dereference) {
resolvedSrcPath = path.resolve(process.cwd(), resolvedSrcPath)
}
checkDest(dest, (err, resolvedDestPath) => {
if (err) return cb(err)
if (resolvedDestPath === notExist || resolvedDestPath === existsReg) {
// if dest already exists, fs throws error anyway,
// so no need to guard against it here.
return fs.symlink(resolvedSrcPath, dest, cb)
} else {
if (opts.dereference) {
resolvedDestPath = path.resolve(process.cwd(), resolvedDestPath)
}
if (resolvedDestPath === resolvedSrcPath) return cb()
// prevent copy if src is a subdir of dest since unlinking
// dest in this case would result in removing src contents
// and therefore a broken symlink would be created.
fs.stat(dest, (err, st) => {
if (err) return cb(err)
if (st.isDirectory() && isSrcSubdir(resolvedDestPath, resolvedSrcPath)) {
return cb(new Error(`Cannot overwrite '${resolvedDestPath}' with '${resolvedSrcPath}'.`))
}
return copyLink(resolvedSrcPath, dest, cb)
})
}
})
})
}
function copyLink (resolvedSrcPath, dest, cb) {
fs.unlink(dest, err => {
if (err) return cb(err)
return fs.symlink(resolvedSrcPath, dest, cb)
})
}
// check if dest exists and/or is a symlink
function checkDest (dest, cb) {
fs.readlink(dest, (err, resolvedPath) => {
if (err) {
if (err.code === 'ENOENT') return cb(null, notExist)
// dest exists and is a regular file or directory, Windows may throw UNKNOWN error.
if (err.code === 'EINVAL' || err.code === 'UNKNOWN') return cb(null, existsReg)
return cb(err)
}
return cb(null, 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 = copy
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