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'use strict'
const fs = require('graceful-fs')
const path = require('path')
const mkdirsSync = require('../mkdirs').mkdirsSync
const utimesMillisSync = require('../util/utimes').utimesMillisSync
const stat = require('../util/stat')
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') {
process.emitWarning(
'Using the preserveTimestamps option in 32-bit node is not recommended;\n\n' +
'\tsee https://github.com/jprichardson/node-fs-extra/issues/269',
'Warning', 'fs-extra-WARN0002'
)
}
const { srcStat, destStat } = stat.checkPathsSync(src, dest, 'copy', opts)
stat.checkParentPathsSync(src, srcStat, dest, 'copy')
return handleFilterAndCopy(destStat, src, dest, opts)
}
function handleFilterAndCopy (destStat, src, dest, opts) {
if (opts.filter && !opts.filter(src, dest)) return
const destParent = path.dirname(dest)
if (!fs.existsSync(destParent)) mkdirsSync(destParent)
return getStats(destStat, src, dest, opts)
}
function startCopy (destStat, src, dest, opts) {
if (opts.filter && !opts.filter(src, dest)) return
return getStats(destStat, src, dest, opts)
}
function getStats (destStat, src, dest, opts) {
const statSync = opts.dereference ? fs.statSync : fs.lstatSync
const srcStat = statSync(src)
if (srcStat.isDirectory()) return onDir(srcStat, destStat, src, dest, opts)
else if (srcStat.isFile() ||
srcStat.isCharacterDevice() ||
srcStat.isBlockDevice()) return onFile(srcStat, destStat, src, dest, opts)
else if (srcStat.isSymbolicLink()) return onLink(destStat, src, dest, opts)
else if (srcStat.isSocket()) throw new Error(`Cannot copy a socket file: ${src}`)
else if (srcStat.isFIFO()) throw new Error(`Cannot copy a FIFO pipe: ${src}`)
throw new Error(`Unknown file: ${src}`)
}
function onFile (srcStat, destStat, src, dest, opts) {
if (!destStat) return copyFile(srcStat, src, dest, opts)
return mayCopyFile(srcStat, src, dest, opts)
}
function mayCopyFile (srcStat, src, dest, opts) {
if (opts.overwrite) {
fs.unlinkSync(dest)
return copyFile(srcStat, src, dest, opts)
} else if (opts.errorOnExist) {
throw new Error(`'${dest}' already exists`)
}
}
function copyFile (srcStat, src, dest, opts) {
fs.copyFileSync(src, dest)
if (opts.preserveTimestamps) handleTimestamps(srcStat.mode, src, dest)
return setDestMode(dest, srcStat.mode)
}
function handleTimestamps (srcMode, src, dest) {
// Make sure the file is writable before setting the timestamp
// otherwise open fails with EPERM when invoked with 'r+'
// (through utimes call)
if (fileIsNotWritable(srcMode)) makeFileWritable(dest, srcMode)
return setDestTimestamps(src, dest)
}
function fileIsNotWritable (srcMode) {
return (srcMode & 0o200) === 0
}
function makeFileWritable (dest, srcMode) {
return setDestMode(dest, srcMode | 0o200)
}
function setDestMode (dest, srcMode) {
return fs.chmodSync(dest, srcMode)
}
function setDestTimestamps (src, dest) {
// The initial srcStat.atime cannot be trusted
// because it is modified by the read(2) system call
// (See https://nodejs.org/api/fs.html#fs_stat_time_values)
const updatedSrcStat = fs.statSync(src)
return utimesMillisSync(dest, updatedSrcStat.atime, updatedSrcStat.mtime)
}
function onDir (srcStat, destStat, src, dest, opts) {
if (!destStat) return mkDirAndCopy(srcStat.mode, src, dest, opts)
return copyDir(src, dest, opts)
}
function mkDirAndCopy (srcMode, src, dest, opts) {
fs.mkdirSync(dest)
copyDir(src, dest, opts)
return setDestMode(dest, srcMode)
}
function copyDir (src, dest, opts) {
fs.readdirSync(src).forEach(item => copyDirItem(item, src, dest, opts))
}
function copyDirItem (item, src, dest, opts) {
const srcItem = path.join(src, item)
const destItem = path.join(dest, item)
const { destStat } = stat.checkPathsSync(srcItem, destItem, 'copy', opts)
return startCopy(destStat, srcItem, destItem, opts)
}
function onLink (destStat, src, dest, opts) {
let resolvedSrc = fs.readlinkSync(src)
if (opts.dereference) {
resolvedSrc = path.resolve(process.cwd(), resolvedSrc)
}
if (!destStat) {
return fs.symlinkSync(resolvedSrc, dest)
} else {
let resolvedDest
try {
resolvedDest = fs.readlinkSync(dest)
} catch (err) {
// dest exists and is a regular file or directory,
// Windows may throw UNKNOWN error. If dest already exists,
// fs throws error anyway, so no need to guard against it here.
if (err.code === 'EINVAL' || err.code === 'UNKNOWN') return fs.symlinkSync(resolvedSrc, dest)
throw err
}
if (opts.dereference) {
resolvedDest = path.resolve(process.cwd(), resolvedDest)
}
if (stat.isSrcSubdir(resolvedSrc, resolvedDest)) {
throw new Error(`Cannot copy '${resolvedSrc}' to a subdirectory of itself, '${resolvedDest}'.`)
}
// 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() && stat.isSrcSubdir(resolvedDest, resolvedSrc)) {
throw new Error(`Cannot overwrite '${resolvedDest}' with '${resolvedSrc}'.`)
}
return copyLink(resolvedSrc, dest)
}
}
function copyLink (resolvedSrc, dest) {
fs.unlinkSync(dest)
return fs.symlinkSync(resolvedSrc, dest)
}
module.exports = copySync