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Mini Shell
Mini Shell
// this file is a modified version of the code in node 17.2.0
// which is, in turn, a modified version of the fs-extra module on npm
// node core changes:
// - Use of the assert module has been replaced with core's error system.
// - All code related to the glob dependency has been removed.
// - Bring your own custom fs module is not currently supported.
// - Some basic code cleanup.
// changes here:
// - remove all callback related code
// - drop sync support
// - change assertions back to non-internal methods (see options.js)
// - throws ENOTDIR when rmdir gets an ENOENT for a path that exists in Windows
'use strict'
const {
ERR_FS_CP_DIR_TO_NON_DIR,
ERR_FS_CP_EEXIST,
ERR_FS_CP_EINVAL,
ERR_FS_CP_FIFO_PIPE,
ERR_FS_CP_NON_DIR_TO_DIR,
ERR_FS_CP_SOCKET,
ERR_FS_CP_SYMLINK_TO_SUBDIRECTORY,
ERR_FS_CP_UNKNOWN,
ERR_FS_EISDIR,
ERR_INVALID_ARG_TYPE,
} = require('../errors.js')
const {
constants: {
errno: {
EEXIST,
EISDIR,
EINVAL,
ENOTDIR,
},
},
} = require('os')
const {
chmod,
copyFile,
lstat,
mkdir,
readdir,
readlink,
stat,
symlink,
unlink,
utimes,
} = require('../fs.js')
const {
dirname,
isAbsolute,
join,
parse,
resolve,
sep,
toNamespacedPath,
} = require('path')
const { fileURLToPath } = require('url')
const defaultOptions = {
dereference: false,
errorOnExist: false,
filter: undefined,
force: true,
preserveTimestamps: false,
recursive: false,
}
async function cp (src, dest, opts) {
if (opts != null && typeof opts !== 'object') {
throw new ERR_INVALID_ARG_TYPE('options', ['Object'], opts)
}
return cpFn(
toNamespacedPath(getValidatedPath(src)),
toNamespacedPath(getValidatedPath(dest)),
{ ...defaultOptions, ...opts })
}
function getValidatedPath (fileURLOrPath) {
const path = fileURLOrPath != null && fileURLOrPath.href
&& fileURLOrPath.origin
? fileURLToPath(fileURLOrPath)
: fileURLOrPath
return path
}
async function cpFn (src, dest, opts) {
// Warn about using preserveTimestamps on 32-bit node
// istanbul ignore next
if (opts.preserveTimestamps && process.arch === 'ia32') {
const warning = 'Using the preserveTimestamps option in 32-bit ' +
'node is not recommended'
process.emitWarning(warning, 'TimestampPrecisionWarning')
}
const stats = await checkPaths(src, dest, opts)
const { srcStat, destStat } = stats
await checkParentPaths(src, srcStat, dest)
if (opts.filter) {
return handleFilter(checkParentDir, destStat, src, dest, opts)
}
return checkParentDir(destStat, src, dest, opts)
}
async function checkPaths (src, dest, opts) {
const { 0: srcStat, 1: destStat } = await getStats(src, dest, opts)
if (destStat) {
if (areIdentical(srcStat, destStat)) {
throw new ERR_FS_CP_EINVAL({
message: 'src and dest cannot be the same',
path: dest,
syscall: 'cp',
errno: EINVAL,
})
}
if (srcStat.isDirectory() && !destStat.isDirectory()) {
throw new ERR_FS_CP_DIR_TO_NON_DIR({
message: `cannot overwrite directory ${src} ` +
`with non-directory ${dest}`,
path: dest,
syscall: 'cp',
errno: EISDIR,
})
}
if (!srcStat.isDirectory() && destStat.isDirectory()) {
throw new ERR_FS_CP_NON_DIR_TO_DIR({
message: `cannot overwrite non-directory ${src} ` +
`with directory ${dest}`,
path: dest,
syscall: 'cp',
errno: ENOTDIR,
})
}
}
if (srcStat.isDirectory() && isSrcSubdir(src, dest)) {
throw new ERR_FS_CP_EINVAL({
message: `cannot copy ${src} to a subdirectory of self ${dest}`,
path: dest,
syscall: 'cp',
errno: EINVAL,
})
}
return { srcStat, destStat }
}
function areIdentical (srcStat, destStat) {
return destStat.ino && destStat.dev && destStat.ino === srcStat.ino &&
destStat.dev === srcStat.dev
}
function getStats (src, dest, opts) {
const statFunc = opts.dereference ?
(file) => stat(file, { bigint: true }) :
(file) => lstat(file, { bigint: true })
return Promise.all([
statFunc(src),
statFunc(dest).catch((err) => {
// istanbul ignore next: unsure how to cover.
if (err.code === 'ENOENT') {
return null
}
// istanbul ignore next: unsure how to cover.
throw err
}),
])
}
async function checkParentDir (destStat, src, dest, opts) {
const destParent = dirname(dest)
const dirExists = await pathExists(destParent)
if (dirExists) {
return getStatsForCopy(destStat, src, dest, opts)
}
await mkdir(destParent, { recursive: true })
return getStatsForCopy(destStat, src, dest, opts)
}
function pathExists (dest) {
return stat(dest).then(
() => true,
// istanbul ignore next: not sure when this would occur
(err) => (err.code === 'ENOENT' ? false : Promise.reject(err)))
}
// Recursively check if dest parent is a subdirectory of src.
// It works for all file types including symlinks since it
// checks the src and dest inodes. It starts from the deepest
// parent and stops once it reaches the src parent or the root path.
async function checkParentPaths (src, srcStat, dest) {
const srcParent = resolve(dirname(src))
const destParent = resolve(dirname(dest))
if (destParent === srcParent || destParent === parse(destParent).root) {
return
}
let destStat
try {
destStat = await stat(destParent, { bigint: true })
} catch (err) {
// istanbul ignore else: not sure when this would occur
if (err.code === 'ENOENT') {
return
}
// istanbul ignore next: not sure when this would occur
throw err
}
if (areIdentical(srcStat, destStat)) {
throw new ERR_FS_CP_EINVAL({
message: `cannot copy ${src} to a subdirectory of self ${dest}`,
path: dest,
syscall: 'cp',
errno: EINVAL,
})
}
return checkParentPaths(src, srcStat, destParent)
}
const normalizePathToArray = (path) =>
resolve(path).split(sep).filter(Boolean)
// Return true if dest is a subdir of src, otherwise false.
// It only checks the path strings.
function isSrcSubdir (src, dest) {
const srcArr = normalizePathToArray(src)
const destArr = normalizePathToArray(dest)
return srcArr.every((cur, i) => destArr[i] === cur)
}
async function handleFilter (onInclude, destStat, src, dest, opts, cb) {
const include = await opts.filter(src, dest)
if (include) {
return onInclude(destStat, src, dest, opts, cb)
}
}
function startCopy (destStat, src, dest, opts) {
if (opts.filter) {
return handleFilter(getStatsForCopy, destStat, src, dest, opts)
}
return getStatsForCopy(destStat, src, dest, opts)
}
async function getStatsForCopy (destStat, src, dest, opts) {
const statFn = opts.dereference ? stat : lstat
const srcStat = await statFn(src)
// istanbul ignore else: can't portably test FIFO
if (srcStat.isDirectory() && opts.recursive) {
return onDir(srcStat, destStat, src, dest, opts)
} else if (srcStat.isDirectory()) {
throw new ERR_FS_EISDIR({
message: `${src} is a directory (not copied)`,
path: src,
syscall: 'cp',
errno: EINVAL,
})
} else if (srcStat.isFile() ||
srcStat.isCharacterDevice() ||
srcStat.isBlockDevice()) {
return onFile(srcStat, destStat, src, dest, opts)
} else if (srcStat.isSymbolicLink()) {
return onLink(destStat, src, dest)
} else if (srcStat.isSocket()) {
throw new ERR_FS_CP_SOCKET({
message: `cannot copy a socket file: ${dest}`,
path: dest,
syscall: 'cp',
errno: EINVAL,
})
} else if (srcStat.isFIFO()) {
throw new ERR_FS_CP_FIFO_PIPE({
message: `cannot copy a FIFO pipe: ${dest}`,
path: dest,
syscall: 'cp',
errno: EINVAL,
})
}
// istanbul ignore next: should be unreachable
throw new ERR_FS_CP_UNKNOWN({
message: `cannot copy an unknown file type: ${dest}`,
path: dest,
syscall: 'cp',
errno: EINVAL,
})
}
function onFile (srcStat, destStat, src, dest, opts) {
if (!destStat) {
return _copyFile(srcStat, src, dest, opts)
}
return mayCopyFile(srcStat, src, dest, opts)
}
async function mayCopyFile (srcStat, src, dest, opts) {
if (opts.force) {
await unlink(dest)
return _copyFile(srcStat, src, dest, opts)
} else if (opts.errorOnExist) {
throw new ERR_FS_CP_EEXIST({
message: `${dest} already exists`,
path: dest,
syscall: 'cp',
errno: EEXIST,
})
}
}
async function _copyFile (srcStat, src, dest, opts) {
await copyFile(src, dest)
if (opts.preserveTimestamps) {
return handleTimestampsAndMode(srcStat.mode, src, dest)
}
return setDestMode(dest, srcStat.mode)
}
async function handleTimestampsAndMode (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)) {
await makeFileWritable(dest, srcMode)
return setDestTimestampsAndMode(srcMode, src, dest)
}
return setDestTimestampsAndMode(srcMode, src, dest)
}
function fileIsNotWritable (srcMode) {
return (srcMode & 0o200) === 0
}
function makeFileWritable (dest, srcMode) {
return setDestMode(dest, srcMode | 0o200)
}
async function setDestTimestampsAndMode (srcMode, src, dest) {
await setDestTimestamps(src, dest)
return setDestMode(dest, srcMode)
}
function setDestMode (dest, srcMode) {
return chmod(dest, srcMode)
}
async 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 = await stat(src)
return utimes(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)
}
async function mkDirAndCopy (srcMode, src, dest, opts) {
await mkdir(dest)
await copyDir(src, dest, opts)
return setDestMode(dest, srcMode)
}
async function copyDir (src, dest, opts) {
const dir = await readdir(src)
for (let i = 0; i < dir.length; i++) {
const item = dir[i]
const srcItem = join(src, item)
const destItem = join(dest, item)
const { destStat } = await checkPaths(srcItem, destItem, opts)
await startCopy(destStat, srcItem, destItem, opts)
}
}
async function onLink (destStat, src, dest) {
let resolvedSrc = await readlink(src)
if (!isAbsolute(resolvedSrc)) {
resolvedSrc = resolve(dirname(src), resolvedSrc)
}
if (!destStat) {
return symlink(resolvedSrc, dest)
}
let resolvedDest
try {
resolvedDest = await readlink(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.
// istanbul ignore next: can only test on windows
if (err.code === 'EINVAL' || err.code === 'UNKNOWN') {
return symlink(resolvedSrc, dest)
}
// istanbul ignore next: should not be possible
throw err
}
if (!isAbsolute(resolvedDest)) {
resolvedDest = resolve(dirname(dest), resolvedDest)
}
if (isSrcSubdir(resolvedSrc, resolvedDest)) {
throw new ERR_FS_CP_EINVAL({
message: `cannot copy ${resolvedSrc} to a subdirectory of self ` +
`${resolvedDest}`,
path: dest,
syscall: 'cp',
errno: EINVAL,
})
}
// Do not 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.
const srcStat = await stat(src)
if (srcStat.isDirectory() && isSrcSubdir(resolvedDest, resolvedSrc)) {
throw new ERR_FS_CP_SYMLINK_TO_SUBDIRECTORY({
message: `cannot overwrite ${resolvedDest} with ${resolvedSrc}`,
path: dest,
syscall: 'cp',
errno: EINVAL,
})
}
return copyLink(resolvedSrc, dest)
}
async function copyLink (resolvedSrc, dest) {
await unlink(dest)
return symlink(resolvedSrc, dest)
}
module.exports = cp
Zerion Mini Shell 1.0