Current File : //opt/alt/alt-nodejs12/root/lib/node_modules/npm/node_modules.bundled/tar/lib/unpack.js
'use strict'
// the PEND/UNPEND stuff tracks whether we're ready to emit end/close yet.
// but the path reservations are required to avoid race conditions where
// parallelized unpack ops may mess with one another, due to dependencies
// (like a Link depending on its target) or destructive operations (like
// clobbering an fs object to create one of a different type.)
const assert = require('assert')
const EE = require('events').EventEmitter
const Parser = require('./parse.js')
const fs = require('fs')
const fsm = require('fs-minipass')
const path = require('path')
const mkdir = require('./mkdir.js')
const mkdirSync = mkdir.sync
const wc = require('./winchars.js')
const stripAbsolutePath = require('./strip-absolute-path.js')
const pathReservations = require('./path-reservations.js')
const normPath = require('./normalize-windows-path.js')
const stripSlash = require('./strip-trailing-slashes.js')
const ONENTRY = Symbol('onEntry')
const CHECKFS = Symbol('checkFs')
const CHECKFS2 = Symbol('checkFs2')
const PRUNECACHE = Symbol('pruneCache')
const ISREUSABLE = Symbol('isReusable')
const MAKEFS = Symbol('makeFs')
const FILE = Symbol('file')
const DIRECTORY = Symbol('directory')
const LINK = Symbol('link')
const SYMLINK = Symbol('symlink')
const HARDLINK = Symbol('hardlink')
const UNSUPPORTED = Symbol('unsupported')
const UNKNOWN = Symbol('unknown')
const CHECKPATH = Symbol('checkPath')
const MKDIR = Symbol('mkdir')
const ONERROR = Symbol('onError')
const PENDING = Symbol('pending')
const PEND = Symbol('pend')
const UNPEND = Symbol('unpend')
const ENDED = Symbol('ended')
const MAYBECLOSE = Symbol('maybeClose')
const SKIP = Symbol('skip')
const DOCHOWN = Symbol('doChown')
const UID = Symbol('uid')
const GID = Symbol('gid')
const CHECKED_CWD = Symbol('checkedCwd')
const crypto = require('crypto')
const platform = process.env.TESTING_TAR_FAKE_PLATFORM || process.platform
const isWindows = platform === 'win32'
// Unlinks on Windows are not atomic.
//
// This means that if you have a file entry, followed by another
// file entry with an identical name, and you cannot re-use the file
// (because it's a hardlink, or because unlink:true is set, or it's
// Windows, which does not have useful nlink values), then the unlink
// will be committed to the disk AFTER the new file has been written
// over the old one, deleting the new file.
//
// To work around this, on Windows systems, we rename the file and then
// delete the renamed file. It's a sloppy kludge, but frankly, I do not
// know of a better way to do this, given windows' non-atomic unlink
// semantics.
//
// See: https://github.com/npm/node-tar/issues/183
/* istanbul ignore next */
const unlinkFile = (path, cb) => {
if (!isWindows)
return fs.unlink(path, cb)
const name = path + '.DELETE.' + crypto.randomBytes(16).toString('hex')
fs.rename(path, name, er => {
if (er)
return cb(er)
fs.unlink(name, cb)
})
}
/* istanbul ignore next */
const unlinkFileSync = path => {
if (!isWindows)
return fs.unlinkSync(path)
const name = path + '.DELETE.' + crypto.randomBytes(16).toString('hex')
fs.renameSync(path, name)
fs.unlinkSync(name)
}
// this.gid, entry.gid, this.processUid
const uint32 = (a, b, c) =>
a === a >>> 0 ? a
: b === b >>> 0 ? b
: c
// clear the cache if it's a case-insensitive unicode-squashing match.
// we can't know if the current file system is case-sensitive or supports
// unicode fully, so we check for similarity on the maximally compatible
// representation. Err on the side of pruning, since all it's doing is
// preventing lstats, and it's not the end of the world if we get a false
// positive.
// Note that on windows, we always drop the entire cache whenever a
// symbolic link is encountered, because 8.3 filenames are impossible
// to reason about, and collisions are hazards rather than just failures.
const cacheKeyNormalize = path => stripSlash(normPath(path))
.normalize('NFKD')
.toLowerCase()
const pruneCache = (cache, abs) => {
abs = cacheKeyNormalize(abs)
for (const path of cache.keys()) {
const pnorm = cacheKeyNormalize(path)
if (pnorm === abs || pnorm.indexOf(abs + '/') === 0)
cache.delete(path)
}
}
const dropCache = cache => {
for (const key of cache.keys())
cache.delete(key)
}
class Unpack extends Parser {
constructor (opt) {
if (!opt)
opt = {}
opt.ondone = _ => {
this[ENDED] = true
this[MAYBECLOSE]()
}
super(opt)
this[CHECKED_CWD] = false
this.reservations = pathReservations()
this.transform = typeof opt.transform === 'function' ? opt.transform : null
this.writable = true
this.readable = false
this[PENDING] = 0
this[ENDED] = false
this.dirCache = opt.dirCache || new Map()
if (typeof opt.uid === 'number' || typeof opt.gid === 'number') {
// need both or neither
if (typeof opt.uid !== 'number' || typeof opt.gid !== 'number')
throw new TypeError('cannot set owner without number uid and gid')
if (opt.preserveOwner)
throw new TypeError(
'cannot preserve owner in archive and also set owner explicitly')
this.uid = opt.uid
this.gid = opt.gid
this.setOwner = true
} else {
this.uid = null
this.gid = null
this.setOwner = false
}
// default true for root
if (opt.preserveOwner === undefined && typeof opt.uid !== 'number')
this.preserveOwner = process.getuid && process.getuid() === 0
else
this.preserveOwner = !!opt.preserveOwner
this.processUid = (this.preserveOwner || this.setOwner) && process.getuid ?
process.getuid() : null
this.processGid = (this.preserveOwner || this.setOwner) && process.getgid ?
process.getgid() : null
// mostly just for testing, but useful in some cases.
// Forcibly trigger a chown on every entry, no matter what
this.forceChown = opt.forceChown === true
// turn ><?| in filenames into 0xf000-higher encoded forms
this.win32 = !!opt.win32 || isWindows
// do not unpack over files that are newer than what's in the archive
this.newer = !!opt.newer
// do not unpack over ANY files
this.keep = !!opt.keep
// do not set mtime/atime of extracted entries
this.noMtime = !!opt.noMtime
// allow .., absolute path entries, and unpacking through symlinks
// without this, warn and skip .., relativize absolutes, and error
// on symlinks in extraction path
this.preservePaths = !!opt.preservePaths
// unlink files and links before writing. This breaks existing hard
// links, and removes symlink directories rather than erroring
this.unlink = !!opt.unlink
this.cwd = normPath(path.resolve(opt.cwd || process.cwd()))
this.strip = +opt.strip || 0
this.processUmask = process.umask()
this.umask = typeof opt.umask === 'number' ? opt.umask : this.processUmask
// default mode for dirs created as parents
this.dmode = opt.dmode || (0o0777 & (~this.umask))
this.fmode = opt.fmode || (0o0666 & (~this.umask))
this.on('entry', entry => this[ONENTRY](entry))
}
[MAYBECLOSE] () {
if (this[ENDED] && this[PENDING] === 0) {
this.emit('prefinish')
this.emit('finish')
this.emit('end')
this.emit('close')
}
}
[CHECKPATH] (entry) {
if (this.strip) {
const parts = normPath(entry.path).split('/')
if (parts.length < this.strip)
return false
entry.path = parts.slice(this.strip).join('/')
if (entry.type === 'Link') {
const linkparts = normPath(entry.linkpath).split('/')
if (linkparts.length >= this.strip)
entry.linkpath = linkparts.slice(this.strip).join('/')
else
return false
}
}
if (!this.preservePaths) {
const p = normPath(entry.path)
const parts = p.split('/')
if (parts.includes('..') || isWindows && /^[a-z]:\.\.$/i.test(parts[0])) {
this.warn(`path contains '..'`, p)
return false
}
// strip off the root
const s = stripAbsolutePath(p)
if (s[0]) {
entry.path = s[1]
this.warn(`stripping ${s[0]} from absolute path`, p)
}
}
if (path.isAbsolute(entry.path))
entry.absolute = normPath(path.resolve(entry.path))
else
entry.absolute = normPath(path.resolve(this.cwd, entry.path))
// if we somehow ended up with a path that escapes the cwd, and we are
// not in preservePaths mode, then something is fishy! This should have
// been prevented above, so ignore this for coverage.
/* istanbul ignore if - defense in depth */
if (!this.preservePaths &&
entry.absolute.indexOf(this.cwd + '/') !== 0 &&
entry.absolute !== this.cwd) {
this.warn('TAR_ENTRY_ERROR', 'path escaped extraction target', {
entry,
path: normPath(entry.path),
resolvedPath: entry.absolute,
cwd: this.cwd,
})
return false
}
// an archive can set properties on the extraction directory, but it
// may not replace the cwd with a different kind of thing entirely.
if (entry.absolute === this.cwd &&
entry.type !== 'Directory' &&
entry.type !== 'GNUDumpDir')
return false
// only encode : chars that aren't drive letter indicators
if (this.win32) {
const { root: aRoot } = path.win32.parse(entry.absolute)
entry.absolute = aRoot + wc.encode(entry.absolute.substr(aRoot.length))
const { root: pRoot } = path.win32.parse(entry.path)
entry.path = pRoot + wc.encode(entry.path.substr(pRoot.length))
}
return true
}
[ONENTRY] (entry) {
if (!this[CHECKPATH](entry))
return entry.resume()
assert.equal(typeof entry.absolute, 'string')
switch (entry.type) {
case 'Directory':
case 'GNUDumpDir':
if (entry.mode)
entry.mode = entry.mode | 0o700
case 'File':
case 'OldFile':
case 'ContiguousFile':
case 'Link':
case 'SymbolicLink':
return this[CHECKFS](entry)
case 'CharacterDevice':
case 'BlockDevice':
case 'FIFO':
return this[UNSUPPORTED](entry)
}
}
[ONERROR] (er, entry) {
// Cwd has to exist, or else nothing works. That's serious.
// Other errors are warnings, which raise the error in strict
// mode, but otherwise continue on.
if (er.name === 'CwdError')
this.emit('error', er)
else {
this.warn(er.message, er)
this[UNPEND]()
entry.resume()
}
}
[MKDIR] (dir, mode, cb) {
mkdir(normPath(dir), {
uid: this.uid,
gid: this.gid,
processUid: this.processUid,
processGid: this.processGid,
umask: this.processUmask,
preserve: this.preservePaths,
unlink: this.unlink,
cache: this.dirCache,
cwd: this.cwd,
mode: mode
}, cb)
}
[DOCHOWN] (entry) {
// in preserve owner mode, chown if the entry doesn't match process
// in set owner mode, chown if setting doesn't match process
return this.forceChown ||
this.preserveOwner &&
( typeof entry.uid === 'number' && entry.uid !== this.processUid ||
typeof entry.gid === 'number' && entry.gid !== this.processGid )
||
( typeof this.uid === 'number' && this.uid !== this.processUid ||
typeof this.gid === 'number' && this.gid !== this.processGid )
}
[UID] (entry) {
return uint32(this.uid, entry.uid, this.processUid)
}
[GID] (entry) {
return uint32(this.gid, entry.gid, this.processGid)
}
[FILE] (entry, fullyDone) {
const mode = entry.mode & 0o7777 || this.fmode
const stream = new fsm.WriteStream(entry.absolute, {
mode: mode,
autoClose: false
})
stream.on('error', er => {
if (stream.fd)
fs.close(stream.fd, () => {})
// flush all the data out so that we aren't left hanging
// if the error wasn't actually fatal. otherwise the parse
// is blocked, and we never proceed.
/* istanbul ignore next */
stream.write = () => true
this[ONERROR](er, entry)
fullyDone()
})
let actions = 1
const done = er => {
if (er) {
/* istanbul ignore else - we should always have a fd by now */
if (stream.fd)
fs.close(stream.fd, () => {})
this[ONERROR](er, entry)
fullyDone()
return
}
if (--actions === 0) {
fs.close(stream.fd, er => {
fullyDone()
/* istanbul ignore next */
er ? this[ONERROR](er, entry) : this[UNPEND]()
})
}
}
stream.on('finish', _ => {
// if futimes fails, try utimes
// if utimes fails, fail with the original error
// same for fchown/chown
const abs = entry.absolute
const fd = stream.fd
if (entry.mtime && !this.noMtime) {
actions++
const atime = entry.atime || new Date()
const mtime = entry.mtime
fs.futimes(fd, atime, mtime, er =>
er ? fs.utimes(abs, atime, mtime, er2 => done(er2 && er))
: done())
}
if (this[DOCHOWN](entry)) {
actions++
const uid = this[UID](entry)
const gid = this[GID](entry)
fs.fchown(fd, uid, gid, er =>
er ? fs.chown(abs, uid, gid, er2 => done(er2 && er))
: done())
}
done()
})
const tx = this.transform ? this.transform(entry) || entry : entry
if (tx !== entry) {
tx.on('error', er => this[ONERROR](er, entry))
entry.pipe(tx)
}
tx.pipe(stream)
}
[DIRECTORY] (entry, fullyDone) {
const mode = entry.mode & 0o7777 || this.dmode
this[MKDIR](entry.absolute, mode, er => {
if (er) {
fullyDone()
return this[ONERROR](er, entry)
}
let actions = 1
const done = _ => {
if (--actions === 0) {
fullyDone()
this[UNPEND]()
entry.resume()
}
}
if (entry.mtime && !this.noMtime) {
actions++
fs.utimes(entry.absolute, entry.atime || new Date(), entry.mtime, done)
}
if (this[DOCHOWN](entry)) {
actions++
fs.chown(entry.absolute, this[UID](entry), this[GID](entry), done)
}
done()
})
}
[UNSUPPORTED] (entry) {
this.warn('unsupported entry type: ' + entry.type, entry)
entry.resume()
}
[SYMLINK] (entry, done) {
this[LINK](entry, entry.linkpath, 'symlink', done)
}
[HARDLINK] (entry, done) {
const linkpath = normPath(path.resolve(this.cwd, entry.linkpath))
this[LINK](entry, linkpath, 'link', done)
}
[PEND] () {
this[PENDING]++
}
[UNPEND] () {
this[PENDING]--
this[MAYBECLOSE]()
}
[SKIP] (entry) {
this[UNPEND]()
entry.resume()
}
// Check if we can reuse an existing filesystem entry safely and
// overwrite it, rather than unlinking and recreating
// Windows doesn't report a useful nlink, so we just never reuse entries
[ISREUSABLE] (entry, st) {
return entry.type === 'File' &&
!this.unlink &&
st.isFile() &&
st.nlink <= 1 &&
!isWindows
}
// check if a thing is there, and if so, try to clobber it
[CHECKFS] (entry) {
this[PEND]()
const paths = [entry.path]
if (entry.linkpath)
paths.push(entry.linkpath)
this.reservations.reserve(paths, done => this[CHECKFS2](entry, done))
}
[PRUNECACHE] (entry) {
// if we are not creating a directory, and the path is in the dirCache,
// then that means we are about to delete the directory we created
// previously, and it is no longer going to be a directory, and neither
// is any of its children.
// If a symbolic link is encountered, all bets are off. There is no
// reasonable way to sanitize the cache in such a way we will be able to
// avoid having filesystem collisions. If this happens with a non-symlink
// entry, it'll just fail to unpack, but a symlink to a directory, using an
// 8.3 shortname or certain unicode attacks, can evade detection and lead
// to arbitrary writes to anywhere on the system.
if (entry.type === 'SymbolicLink')
dropCache(this.dirCache)
else if (entry.type !== 'Directory')
pruneCache(this.dirCache, entry.absolute)
}
[CHECKFS2] (entry, fullyDone) {
this[PRUNECACHE](entry)
const done = er => {
this[PRUNECACHE](entry)
fullyDone(er)
}
const checkCwd = () => {
this[MKDIR](this.cwd, this.dmode, er => {
if (er) {
this[ONERROR](er, entry)
done()
return
}
this[CHECKED_CWD] = true
start()
})
}
const start = () => {
if (entry.absolute !== this.cwd) {
const parent = normPath(path.dirname(entry.absolute))
if (parent !== this.cwd) {
return this[MKDIR](parent, this.dmode, er => {
if (er) {
this[ONERROR](er, entry)
done()
return
}
afterMakeParent()
})
}
}
afterMakeParent()
}
const afterMakeParent = () => {
fs.lstat(entry.absolute, (lstatEr, st) => {
if (st && (this.keep || this.newer && st.mtime > entry.mtime)) {
this[SKIP](entry)
done()
return
}
if (lstatEr || this[ISREUSABLE](entry, st))
return this[MAKEFS](null, entry, done)
if (st.isDirectory()) {
if (entry.type === 'Directory') {
const needChmod = !this.noChmod &&
entry.mode &&
(st.mode & 0o7777) !== entry.mode
const afterChmod = er => this[MAKEFS](er, entry, done)
if (!needChmod)
return afterChmod()
return fs.chmod(entry.absolute, entry.mode, afterChmod)
}
// Not a dir entry, have to remove it.
// NB: the only way to end up with an entry that is the cwd
// itself, in such a way that == does not detect, is a
// tricky windows absolute path with UNC or 8.3 parts (and
// preservePaths:true, or else it will have been stripped).
// In that case, the user has opted out of path protections
// explicitly, so if they blow away the cwd, c'est la vie.
if (entry.absolute !== this.cwd) {
return fs.rmdir(entry.absolute, er =>
this[MAKEFS](er, entry, done))
}
}
// not a dir, and not reusable
// don't remove if the cwd, we want that error
if (entry.absolute === this.cwd)
return this[MAKEFS](null, entry, done)
unlinkFile(entry.absolute, er =>
this[MAKEFS](er, entry, done))
})
}
if (this[CHECKED_CWD])
start()
else
checkCwd()
}
[MAKEFS] (er, entry, done) {
if (er)
return this[ONERROR](er, entry)
switch (entry.type) {
case 'File':
case 'OldFile':
case 'ContiguousFile':
return this[FILE](entry, done)
case 'Link':
return this[HARDLINK](entry, done)
case 'SymbolicLink':
return this[SYMLINK](entry, done)
case 'Directory':
case 'GNUDumpDir':
return this[DIRECTORY](entry, done)
}
}
[LINK] (entry, linkpath, link, done) {
// XXX: get the type ('symlink' or 'junction') for windows
fs[link](linkpath, entry.absolute, er => {
if (er)
return this[ONERROR](er, entry)
done()
this[UNPEND]()
entry.resume()
})
}
}
const callSync = fn => {
try {
return [null, fn()]
} catch (er) {
return [er, null]
}
}
class UnpackSync extends Unpack {
[MAKEFS] (er, entry) {
return super[MAKEFS](er, entry, /* istanbul ignore next */ () => {})
}
[CHECKFS] (entry) {
this[PRUNECACHE](entry)
if (!this[CHECKED_CWD]) {
const er = this[MKDIR](this.cwd, this.dmode)
if (er)
return this[ONERROR](er, entry)
this[CHECKED_CWD] = true
}
// don't bother to make the parent if the current entry is the cwd,
// we've already checked it.
if (entry.absolute !== this.cwd) {
const parent = normPath(path.dirname(entry.absolute))
if (parent !== this.cwd) {
const mkParent = this[MKDIR](parent, this.dmode)
if (mkParent)
return this[ONERROR](mkParent, entry)
}
}
const [lstatEr, st] = callSync(() => fs.lstatSync(entry.absolute))
if (st && (this.keep || this.newer && st.mtime > entry.mtime))
return this[SKIP](entry)
if (lstatEr || this[ISREUSABLE](entry, st))
return this[MAKEFS](null, entry)
if (st.isDirectory()) {
if (entry.type === 'Directory') {
const needChmod = !this.noChmod &&
entry.mode &&
(st.mode & 0o7777) !== entry.mode
const [er] = needChmod ? callSync(() => {
fs.chmodSync(entry.absolute, entry.mode)
}) : []
return this[MAKEFS](er, entry)
}
// not a dir entry, have to remove it
const [er] = callSync(() => fs.rmdirSync(entry.absolute))
this[MAKEFS](er, entry)
}
// not a dir, and not reusable.
// don't remove if it's the cwd, since we want that error.
const [er] = entry.absolute === this.cwd ? []
: callSync(() => unlinkFileSync(entry.absolute))
this[MAKEFS](er, entry)
}
[FILE] (entry, done) {
const mode = entry.mode & 0o7777 || this.fmode
const oner = er => {
let closeError
try {
fs.closeSync(fd)
} catch (e) {
closeError = e
}
if (er || closeError)
this[ONERROR](er || closeError, entry)
done()
}
let stream
let fd
try {
fd = fs.openSync(entry.absolute, 'w', mode)
} catch (er) {
return oner(er)
}
const tx = this.transform ? this.transform(entry) || entry : entry
if (tx !== entry) {
tx.on('error', er => this[ONERROR](er, entry))
entry.pipe(tx)
}
tx.on('data', chunk => {
try {
fs.writeSync(fd, chunk, 0, chunk.length)
} catch (er) {
oner(er)
}
})
tx.on('end', _ => {
let er = null
// try both, falling futimes back to utimes
// if either fails, handle the first error
if (entry.mtime && !this.noMtime) {
const atime = entry.atime || new Date()
const mtime = entry.mtime
try {
fs.futimesSync(fd, atime, mtime)
} catch (futimeser) {
try {
fs.utimesSync(entry.absolute, atime, mtime)
} catch (utimeser) {
er = futimeser
}
}
}
if (this[DOCHOWN](entry)) {
const uid = this[UID](entry)
const gid = this[GID](entry)
try {
fs.fchownSync(fd, uid, gid)
} catch (fchowner) {
try {
fs.chownSync(entry.absolute, uid, gid)
} catch (chowner) {
er = er || fchowner
}
}
}
oner(er)
})
}
[DIRECTORY] (entry, done) {
const mode = entry.mode & 0o7777 || this.dmode
const er = this[MKDIR](entry.absolute, mode)
if (er) {
this[ONERROR](er, entry)
done()
return
}
if (entry.mtime && !this.noMtime) {
try {
fs.utimesSync(entry.absolute, entry.atime || new Date(), entry.mtime)
} catch (er) {}
}
if (this[DOCHOWN](entry)) {
try {
fs.chownSync(entry.absolute, this[UID](entry), this[GID](entry))
} catch (er) {}
}
done()
entry.resume()
}
[MKDIR] (dir, mode) {
try {
return mkdir.sync(normPath(dir), {
uid: this.uid,
gid: this.gid,
processUid: this.processUid,
processGid: this.processGid,
umask: this.processUmask,
preserve: this.preservePaths,
unlink: this.unlink,
cache: this.dirCache,
cwd: this.cwd,
mode: mode
})
} catch (er) {
return er
}
}
[LINK] (entry, linkpath, link, done) {
try {
fs[link + 'Sync'](linkpath, entry.absolute)
done()
entry.resume()
} catch (er) {
return this[ONERROR](er, entry)
}
}
}
Unpack.Sync = UnpackSync
module.exports = Unpack
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