680 lines
18 KiB
JavaScript
680 lines
18 KiB
JavaScript
'use strict'
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// the PEND/UNPEND stuff tracks whether we're ready to emit end/close yet.
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// but the path reservations are required to avoid race conditions where
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// parallelized unpack ops may mess with one another, due to dependencies
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// (like a Link depending on its target) or destructive operations (like
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// clobbering an fs object to create one of a different type.)
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const assert = require('assert')
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const Parser = require('./parse.js')
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const fs = require('fs')
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const fsm = require('fs-minipass')
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const path = require('path')
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const mkdir = require('./mkdir.js')
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const wc = require('./winchars.js')
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const pathReservations = require('./path-reservations.js')
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const ONENTRY = Symbol('onEntry')
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const CHECKFS = Symbol('checkFs')
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const CHECKFS2 = Symbol('checkFs2')
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const ISREUSABLE = Symbol('isReusable')
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const MAKEFS = Symbol('makeFs')
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const FILE = Symbol('file')
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const DIRECTORY = Symbol('directory')
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const LINK = Symbol('link')
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const SYMLINK = Symbol('symlink')
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const HARDLINK = Symbol('hardlink')
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const UNSUPPORTED = Symbol('unsupported')
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const CHECKPATH = Symbol('checkPath')
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const MKDIR = Symbol('mkdir')
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const ONERROR = Symbol('onError')
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const PENDING = Symbol('pending')
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const PEND = Symbol('pend')
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const UNPEND = Symbol('unpend')
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const ENDED = Symbol('ended')
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const MAYBECLOSE = Symbol('maybeClose')
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const SKIP = Symbol('skip')
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const DOCHOWN = Symbol('doChown')
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const UID = Symbol('uid')
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const GID = Symbol('gid')
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const crypto = require('crypto')
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const getFlag = require('./get-write-flag.js')
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/* istanbul ignore next */
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const neverCalled = () => {
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throw new Error('sync function called cb somehow?!?')
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}
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// Unlinks on Windows are not atomic.
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//
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// This means that if you have a file entry, followed by another
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// file entry with an identical name, and you cannot re-use the file
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// (because it's a hardlink, or because unlink:true is set, or it's
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// Windows, which does not have useful nlink values), then the unlink
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// will be committed to the disk AFTER the new file has been written
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// over the old one, deleting the new file.
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//
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// To work around this, on Windows systems, we rename the file and then
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// delete the renamed file. It's a sloppy kludge, but frankly, I do not
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// know of a better way to do this, given windows' non-atomic unlink
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// semantics.
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//
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// See: https://github.com/npm/node-tar/issues/183
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/* istanbul ignore next */
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const unlinkFile = (path, cb) => {
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if (process.platform !== 'win32')
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return fs.unlink(path, cb)
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const name = path + '.DELETE.' + crypto.randomBytes(16).toString('hex')
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fs.rename(path, name, er => {
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if (er)
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return cb(er)
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fs.unlink(name, cb)
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})
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}
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/* istanbul ignore next */
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const unlinkFileSync = path => {
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if (process.platform !== 'win32')
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return fs.unlinkSync(path)
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const name = path + '.DELETE.' + crypto.randomBytes(16).toString('hex')
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fs.renameSync(path, name)
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fs.unlinkSync(name)
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}
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// this.gid, entry.gid, this.processUid
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const uint32 = (a, b, c) =>
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a === a >>> 0 ? a
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: b === b >>> 0 ? b
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: c
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class Unpack extends Parser {
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constructor (opt) {
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if (!opt)
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opt = {}
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opt.ondone = _ => {
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this[ENDED] = true
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this[MAYBECLOSE]()
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}
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super(opt)
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this.reservations = pathReservations()
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this.transform = typeof opt.transform === 'function' ? opt.transform : null
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this.writable = true
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this.readable = false
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this[PENDING] = 0
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this[ENDED] = false
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this.dirCache = opt.dirCache || new Map()
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if (typeof opt.uid === 'number' || typeof opt.gid === 'number') {
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// need both or neither
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if (typeof opt.uid !== 'number' || typeof opt.gid !== 'number')
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throw new TypeError('cannot set owner without number uid and gid')
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if (opt.preserveOwner) {
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throw new TypeError(
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'cannot preserve owner in archive and also set owner explicitly')
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}
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this.uid = opt.uid
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this.gid = opt.gid
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this.setOwner = true
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} else {
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this.uid = null
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this.gid = null
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this.setOwner = false
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}
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// default true for root
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if (opt.preserveOwner === undefined && typeof opt.uid !== 'number')
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this.preserveOwner = process.getuid && process.getuid() === 0
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else
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this.preserveOwner = !!opt.preserveOwner
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this.processUid = (this.preserveOwner || this.setOwner) && process.getuid ?
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process.getuid() : null
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this.processGid = (this.preserveOwner || this.setOwner) && process.getgid ?
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process.getgid() : null
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// mostly just for testing, but useful in some cases.
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// Forcibly trigger a chown on every entry, no matter what
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this.forceChown = opt.forceChown === true
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// turn ><?| in filenames into 0xf000-higher encoded forms
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this.win32 = !!opt.win32 || process.platform === 'win32'
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// do not unpack over files that are newer than what's in the archive
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this.newer = !!opt.newer
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// do not unpack over ANY files
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this.keep = !!opt.keep
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// do not set mtime/atime of extracted entries
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this.noMtime = !!opt.noMtime
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// allow .., absolute path entries, and unpacking through symlinks
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// without this, warn and skip .., relativize absolutes, and error
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// on symlinks in extraction path
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this.preservePaths = !!opt.preservePaths
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// unlink files and links before writing. This breaks existing hard
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// links, and removes symlink directories rather than erroring
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this.unlink = !!opt.unlink
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this.cwd = path.resolve(opt.cwd || process.cwd())
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this.strip = +opt.strip || 0
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// if we're not chmodding, then we don't need the process umask
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this.processUmask = opt.noChmod ? 0 : process.umask()
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this.umask = typeof opt.umask === 'number' ? opt.umask : this.processUmask
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// default mode for dirs created as parents
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this.dmode = opt.dmode || (0o0777 & (~this.umask))
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this.fmode = opt.fmode || (0o0666 & (~this.umask))
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this.on('entry', entry => this[ONENTRY](entry))
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}
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// a bad or damaged archive is a warning for Parser, but an error
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// when extracting. Mark those errors as unrecoverable, because
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// the Unpack contract cannot be met.
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warn (code, msg, data = {}) {
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if (code === 'TAR_BAD_ARCHIVE' || code === 'TAR_ABORT')
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data.recoverable = false
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return super.warn(code, msg, data)
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}
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[MAYBECLOSE] () {
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if (this[ENDED] && this[PENDING] === 0) {
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this.emit('prefinish')
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this.emit('finish')
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this.emit('end')
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this.emit('close')
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}
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}
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[CHECKPATH] (entry) {
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if (this.strip) {
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const parts = entry.path.split(/\/|\\/)
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if (parts.length < this.strip)
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return false
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entry.path = parts.slice(this.strip).join('/')
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if (entry.type === 'Link') {
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const linkparts = entry.linkpath.split(/\/|\\/)
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if (linkparts.length >= this.strip)
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entry.linkpath = linkparts.slice(this.strip).join('/')
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}
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}
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if (!this.preservePaths) {
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const p = entry.path
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if (p.match(/(^|\/|\\)\.\.(\\|\/|$)/)) {
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this.warn('TAR_ENTRY_ERROR', `path contains '..'`, {
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entry,
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path: p,
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})
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return false
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}
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// absolutes on posix are also absolutes on win32
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// so we only need to test this one to get both
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if (path.win32.isAbsolute(p)) {
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const parsed = path.win32.parse(p)
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entry.path = p.substr(parsed.root.length)
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const r = parsed.root
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this.warn('TAR_ENTRY_INFO', `stripping ${r} from absolute path`, {
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entry,
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path: p,
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})
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}
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}
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// only encode : chars that aren't drive letter indicators
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if (this.win32) {
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const parsed = path.win32.parse(entry.path)
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entry.path = parsed.root === '' ? wc.encode(entry.path)
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: parsed.root + wc.encode(entry.path.substr(parsed.root.length))
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}
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if (path.isAbsolute(entry.path))
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entry.absolute = entry.path
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else
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entry.absolute = path.resolve(this.cwd, entry.path)
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return true
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}
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[ONENTRY] (entry) {
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if (!this[CHECKPATH](entry))
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return entry.resume()
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assert.equal(typeof entry.absolute, 'string')
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switch (entry.type) {
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case 'Directory':
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case 'GNUDumpDir':
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if (entry.mode)
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entry.mode = entry.mode | 0o700
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case 'File':
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case 'OldFile':
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case 'ContiguousFile':
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case 'Link':
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case 'SymbolicLink':
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return this[CHECKFS](entry)
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case 'CharacterDevice':
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case 'BlockDevice':
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case 'FIFO':
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default:
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return this[UNSUPPORTED](entry)
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}
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}
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[ONERROR] (er, entry) {
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// Cwd has to exist, or else nothing works. That's serious.
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// Other errors are warnings, which raise the error in strict
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// mode, but otherwise continue on.
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if (er.name === 'CwdError')
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this.emit('error', er)
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else {
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this.warn('TAR_ENTRY_ERROR', er, {entry})
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this[UNPEND]()
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entry.resume()
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}
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}
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[MKDIR] (dir, mode, cb) {
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mkdir(dir, {
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uid: this.uid,
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gid: this.gid,
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processUid: this.processUid,
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processGid: this.processGid,
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umask: this.processUmask,
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preserve: this.preservePaths,
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unlink: this.unlink,
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cache: this.dirCache,
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cwd: this.cwd,
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mode: mode,
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noChmod: this.noChmod,
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}, cb)
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}
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[DOCHOWN] (entry) {
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// in preserve owner mode, chown if the entry doesn't match process
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// in set owner mode, chown if setting doesn't match process
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return this.forceChown ||
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this.preserveOwner &&
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(typeof entry.uid === 'number' && entry.uid !== this.processUid ||
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typeof entry.gid === 'number' && entry.gid !== this.processGid)
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||
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(typeof this.uid === 'number' && this.uid !== this.processUid ||
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typeof this.gid === 'number' && this.gid !== this.processGid)
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}
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[UID] (entry) {
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return uint32(this.uid, entry.uid, this.processUid)
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}
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[GID] (entry) {
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return uint32(this.gid, entry.gid, this.processGid)
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}
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[FILE] (entry, fullyDone) {
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const mode = entry.mode & 0o7777 || this.fmode
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const stream = new fsm.WriteStream(entry.absolute, {
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flags: getFlag(entry.size),
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mode: mode,
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autoClose: false,
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})
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stream.on('error', er => this[ONERROR](er, entry))
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let actions = 1
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const done = er => {
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if (er)
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return this[ONERROR](er, entry)
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if (--actions === 0) {
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fs.close(stream.fd, er => {
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fullyDone()
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er ? this[ONERROR](er, entry) : this[UNPEND]()
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})
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}
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}
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stream.on('finish', _ => {
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// if futimes fails, try utimes
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// if utimes fails, fail with the original error
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// same for fchown/chown
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const abs = entry.absolute
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const fd = stream.fd
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if (entry.mtime && !this.noMtime) {
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actions++
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const atime = entry.atime || new Date()
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const mtime = entry.mtime
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fs.futimes(fd, atime, mtime, er =>
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er ? fs.utimes(abs, atime, mtime, er2 => done(er2 && er))
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: done())
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}
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if (this[DOCHOWN](entry)) {
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actions++
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const uid = this[UID](entry)
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const gid = this[GID](entry)
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fs.fchown(fd, uid, gid, er =>
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er ? fs.chown(abs, uid, gid, er2 => done(er2 && er))
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: done())
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}
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done()
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})
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const tx = this.transform ? this.transform(entry) || entry : entry
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if (tx !== entry) {
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tx.on('error', er => this[ONERROR](er, entry))
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entry.pipe(tx)
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}
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tx.pipe(stream)
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}
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[DIRECTORY] (entry, fullyDone) {
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const mode = entry.mode & 0o7777 || this.dmode
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this[MKDIR](entry.absolute, mode, er => {
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if (er) {
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fullyDone()
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return this[ONERROR](er, entry)
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}
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let actions = 1
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const done = _ => {
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if (--actions === 0) {
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fullyDone()
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this[UNPEND]()
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entry.resume()
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}
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}
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if (entry.mtime && !this.noMtime) {
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actions++
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fs.utimes(entry.absolute, entry.atime || new Date(), entry.mtime, done)
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}
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if (this[DOCHOWN](entry)) {
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actions++
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fs.chown(entry.absolute, this[UID](entry), this[GID](entry), done)
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}
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done()
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})
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}
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[UNSUPPORTED] (entry) {
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entry.unsupported = true
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this.warn('TAR_ENTRY_UNSUPPORTED',
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`unsupported entry type: ${entry.type}`, {entry})
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entry.resume()
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}
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[SYMLINK] (entry, done) {
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this[LINK](entry, entry.linkpath, 'symlink', done)
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}
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[HARDLINK] (entry, done) {
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this[LINK](entry, path.resolve(this.cwd, entry.linkpath), 'link', done)
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}
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[PEND] () {
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this[PENDING]++
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}
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[UNPEND] () {
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this[PENDING]--
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this[MAYBECLOSE]()
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}
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[SKIP] (entry) {
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this[UNPEND]()
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entry.resume()
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}
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// Check if we can reuse an existing filesystem entry safely and
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// overwrite it, rather than unlinking and recreating
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// Windows doesn't report a useful nlink, so we just never reuse entries
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[ISREUSABLE] (entry, st) {
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return entry.type === 'File' &&
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!this.unlink &&
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st.isFile() &&
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st.nlink <= 1 &&
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process.platform !== 'win32'
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}
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// check if a thing is there, and if so, try to clobber it
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[CHECKFS] (entry) {
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this[PEND]()
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const paths = [entry.path]
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if (entry.linkpath)
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paths.push(entry.linkpath)
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this.reservations.reserve(paths, done => this[CHECKFS2](entry, done))
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}
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[CHECKFS2] (entry, done) {
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this[MKDIR](path.dirname(entry.absolute), this.dmode, er => {
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if (er) {
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done()
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return this[ONERROR](er, entry)
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}
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fs.lstat(entry.absolute, (er, st) => {
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if (st && (this.keep || this.newer && st.mtime > entry.mtime)) {
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this[SKIP](entry)
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done()
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} else if (er || this[ISREUSABLE](entry, st))
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this[MAKEFS](null, entry, done)
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else if (st.isDirectory()) {
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if (entry.type === 'Directory') {
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if (!this.noChmod && (!entry.mode || (st.mode & 0o7777) === entry.mode))
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this[MAKEFS](null, entry, done)
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else {
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fs.chmod(entry.absolute, entry.mode,
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er => this[MAKEFS](er, entry, done))
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}
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} else
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fs.rmdir(entry.absolute, er => this[MAKEFS](er, entry, done))
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} else
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unlinkFile(entry.absolute, er => this[MAKEFS](er, entry, done))
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})
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})
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}
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[MAKEFS] (er, entry, done) {
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if (er)
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return this[ONERROR](er, entry)
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switch (entry.type) {
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case 'File':
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case 'OldFile':
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case 'ContiguousFile':
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return this[FILE](entry, done)
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case 'Link':
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return this[HARDLINK](entry, done)
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case 'SymbolicLink':
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return this[SYMLINK](entry, done)
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case 'Directory':
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case 'GNUDumpDir':
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return this[DIRECTORY](entry, done)
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}
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}
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[LINK] (entry, linkpath, link, done) {
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// XXX: get the type ('file' or 'dir') for windows
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fs[link](linkpath, entry.absolute, er => {
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if (er)
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return this[ONERROR](er, entry)
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done()
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this[UNPEND]()
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entry.resume()
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})
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}
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}
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class UnpackSync extends Unpack {
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[CHECKFS] (entry) {
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const er = this[MKDIR](path.dirname(entry.absolute), this.dmode, neverCalled)
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if (er)
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return this[ONERROR](er, entry)
|
|
try {
|
|
const st = fs.lstatSync(entry.absolute)
|
|
if (this.keep || this.newer && st.mtime > entry.mtime)
|
|
return this[SKIP](entry)
|
|
else if (this[ISREUSABLE](entry, st))
|
|
return this[MAKEFS](null, entry, neverCalled)
|
|
else {
|
|
try {
|
|
if (st.isDirectory()) {
|
|
if (entry.type === 'Directory') {
|
|
if (!this.noChmod && entry.mode && (st.mode & 0o7777) !== entry.mode)
|
|
fs.chmodSync(entry.absolute, entry.mode)
|
|
} else
|
|
fs.rmdirSync(entry.absolute)
|
|
} else
|
|
unlinkFileSync(entry.absolute)
|
|
return this[MAKEFS](null, entry, neverCalled)
|
|
} catch (er) {
|
|
return this[ONERROR](er, entry)
|
|
}
|
|
}
|
|
} catch (er) {
|
|
return this[MAKEFS](null, entry, neverCalled)
|
|
}
|
|
}
|
|
|
|
[FILE] (entry, _) {
|
|
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)
|
|
}
|
|
|
|
let fd
|
|
try {
|
|
fd = fs.openSync(entry.absolute, getFlag(entry.size), 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, _) {
|
|
const mode = entry.mode & 0o7777 || this.dmode
|
|
const er = this[MKDIR](entry.absolute, mode)
|
|
if (er)
|
|
return this[ONERROR](er, entry)
|
|
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) {}
|
|
}
|
|
entry.resume()
|
|
}
|
|
|
|
[MKDIR] (dir, mode) {
|
|
try {
|
|
return mkdir.sync(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, _) {
|
|
try {
|
|
fs[link + 'Sync'](linkpath, entry.absolute)
|
|
entry.resume()
|
|
} catch (er) {
|
|
return this[ONERROR](er, entry)
|
|
}
|
|
}
|
|
}
|
|
|
|
Unpack.Sync = UnpackSync
|
|
module.exports = Unpack
|