/
stat.js
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/
stat.js
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'use strict'
const fs = require('../fs')
const path = require('path')
const util = require('util')
const atLeastNode = require('at-least-node')
const nodeSupportsBigInt = atLeastNode('10.5.0')
const stat = (file) => nodeSupportsBigInt ? fs.stat(file, { bigint: true }) : fs.stat(file)
const lstat = (file) => nodeSupportsBigInt ? fs.lstat(file, { bigint: true }) : fs.lstat(file)
const statSync = (file) => nodeSupportsBigInt ? fs.statSync(file, { bigint: true }) : fs.statSync(file)
const lstatSync = (file) => nodeSupportsBigInt ? fs.lstatSync(file, { bigint: true }) : fs.lstatSync(file)
function getStats (src, dest, opts) {
const statFunc = opts.dereference ? stat : lstat
return Promise.all([
statFunc(src),
statFunc(dest).catch(err => {
if (err.code === 'ENOENT') return null
throw err
})
]).then(([srcStat, destStat]) => ({ srcStat, destStat }))
}
function getStatsSync (src, dest, opts) {
let destStat
const statFunc = opts.dereference ? statSync : lstatSync
const srcStat = statFunc(src)
try {
destStat = statFunc(dest)
} catch (err) {
if (err.code === 'ENOENT') return { srcStat, destStat: null }
throw err
}
return { srcStat, destStat }
}
function checkPaths (src, dest, funcName, opts, cb) {
util.callbackify(getStats)(src, dest, opts, (err, stats) => {
if (err) return cb(err)
const { srcStat, destStat } = stats
if (destStat) {
if (areIdentical(srcStat, destStat)) {
const srcBaseName = path.basename(src)
const destBaseName = path.basename(dest)
if (funcName === 'move' &&
srcBaseName !== destBaseName &&
srcBaseName.toLowerCase() === destBaseName.toLowerCase()) {
return cb(null, { srcStat, destStat, isChangingCase: true })
}
return cb(new Error('Source and destination must not be the same.'))
}
if (srcStat.isDirectory() && !destStat.isDirectory()) {
return cb(new Error(`Cannot overwrite non-directory '${dest}' with directory '${src}'.`))
}
if (!srcStat.isDirectory() && destStat.isDirectory()) {
return cb(new Error(`Cannot overwrite directory '${dest}' with non-directory '${src}'.`))
}
}
if (srcStat.isDirectory() && isSrcSubdir(src, dest)) {
return cb(new Error(errMsg(src, dest, funcName)))
}
return cb(null, { srcStat, destStat })
})
}
function checkPathsSync (src, dest, funcName, opts) {
const { srcStat, destStat } = getStatsSync(src, dest, opts)
if (destStat) {
if (areIdentical(srcStat, destStat)) {
const srcBaseName = path.basename(src)
const destBaseName = path.basename(dest)
if (funcName === 'move' &&
srcBaseName !== destBaseName &&
srcBaseName.toLowerCase() === destBaseName.toLowerCase()) {
return { srcStat, destStat, isChangingCase: true }
}
throw new Error('Source and destination must not be the same.')
}
if (srcStat.isDirectory() && !destStat.isDirectory()) {
throw new Error(`Cannot overwrite non-directory '${dest}' with directory '${src}'.`)
}
if (!srcStat.isDirectory() && destStat.isDirectory()) {
throw new Error(`Cannot overwrite directory '${dest}' with non-directory '${src}'.`)
}
}
if (srcStat.isDirectory() && isSrcSubdir(src, dest)) {
throw new Error(errMsg(src, dest, funcName))
}
return { srcStat, destStat }
}
// 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.
function checkParentPaths (src, srcStat, dest, funcName, cb) {
const srcParent = path.resolve(path.dirname(src))
const destParent = path.resolve(path.dirname(dest))
if (destParent === srcParent || destParent === path.parse(destParent).root) return cb()
const callback = (err, destStat) => {
if (err) {
if (err.code === 'ENOENT') return cb()
return cb(err)
}
if (areIdentical(srcStat, destStat)) {
return cb(new Error(errMsg(src, dest, funcName)))
}
return checkParentPaths(src, srcStat, destParent, funcName, cb)
}
if (nodeSupportsBigInt) fs.stat(destParent, { bigint: true }, callback)
else fs.stat(destParent, callback)
}
function checkParentPathsSync (src, srcStat, dest, funcName) {
const srcParent = path.resolve(path.dirname(src))
const destParent = path.resolve(path.dirname(dest))
if (destParent === srcParent || destParent === path.parse(destParent).root) return
let destStat
try {
destStat = statSync(destParent)
} catch (err) {
if (err.code === 'ENOENT') return
throw err
}
if (areIdentical(srcStat, destStat)) {
throw new Error(errMsg(src, dest, funcName))
}
return checkParentPathsSync(src, srcStat, destParent, funcName)
}
function areIdentical (srcStat, destStat) {
if (destStat.ino && destStat.dev && destStat.ino === srcStat.ino && destStat.dev === srcStat.dev) {
if (nodeSupportsBigInt || destStat.ino < Number.MAX_SAFE_INTEGER) {
// definitive answer
return true
}
// Use additional heuristics if we can't use 'bigint'.
// Different 'ino' could be represented the same if they are >= Number.MAX_SAFE_INTEGER
// See issue 657
if (destStat.size === srcStat.size &&
destStat.mode === srcStat.mode &&
destStat.nlink === srcStat.nlink &&
destStat.atimeMs === srcStat.atimeMs &&
destStat.mtimeMs === srcStat.mtimeMs &&
destStat.ctimeMs === srcStat.ctimeMs &&
destStat.birthtimeMs === srcStat.birthtimeMs) {
// heuristic answer
return true
}
}
return false
}
// return true if dest is a subdir of src, otherwise false.
// It only checks the path strings.
function isSrcSubdir (src, dest) {
const srcArr = path.resolve(src).split(path.sep).filter(i => i)
const destArr = path.resolve(dest).split(path.sep).filter(i => i)
return srcArr.reduce((acc, cur, i) => acc && destArr[i] === cur, true)
}
function errMsg (src, dest, funcName) {
return `Cannot ${funcName} '${src}' to a subdirectory of itself, '${dest}'.`
}
module.exports = {
checkPaths,
checkPathsSync,
checkParentPaths,
checkParentPathsSync,
isSrcSubdir,
areIdentical
}