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 <a href="../../index.html">All files</a> / <a href="index.html">tar/lib</a> unpack.js
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&nbsp;</td><td class="text"><pre class="prettyprint lang-js">'use strict'
&nbsp;
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')
&nbsp;
const ONENTRY = Symbol('onEntry')
const CHECKFS = Symbol('checkFs')
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')
&nbsp;
// this.gid, entry.gid, this.processUid
const uint32 = (a, b, c) =&gt;
 a === a &gt;&gt;&gt; 0 ? a
 : b === b &gt;&gt;&gt; 0 ? b
 : c
&nbsp;
class Unpack extends Parser {
 constructor (opt) {
 if (!opt)
 opt = {}
&nbsp;
 opt.ondone = _ =&gt; {
 this[ENDED] = true
 this[MAYBECLOSE]()
 }
&nbsp;
 super(opt)
&nbsp;
 this.writable = true
 this.readable = false
&nbsp;
 this[PENDING] = 0
 this[ENDED] = false
&nbsp;
 this.dirCache = opt.dirCache || new Map()
&nbsp;
 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
 }
&nbsp;
 // default true for root
 if (opt.preserveOwner === undefined &amp;&amp; typeof opt.uid !== 'number')
 this.preserveOwner = process.getuid &amp;&amp; process.getuid() === 0
 else
 this.preserveOwner = !!opt.preserveOwner
&nbsp;
 this.processUid = (this.preserveOwner || this.setOwner) &amp;&amp; process.getuid ?
 process.getuid() : null
 this.processGid = (this.preserveOwner || this.setOwner) &amp;&amp; process.getgid ?
 process.getgid() : null
&nbsp;
 // turn &gt;&lt;?| in filenames into 0xf000-higher encoded forms
 this.win32 = !!opt.win32 || process.platform === 'win32'
&nbsp;
 // do not unpack over files that are newer than what's in the archive
 this.newer = !!opt.newer
&nbsp;
 // do not unpack over ANY files
 this.keep = !!opt.keep
&nbsp;
 // do not set mtime/atime of extracted entries
 this.noMtime = !!opt.noMtime
&nbsp;
 // 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
&nbsp;
 // unlink files and links before writing. This breaks existing hard
 // links, and removes symlink directories rather than erroring
 this.unlink = !!opt.unlink
&nbsp;
 this.cwd = 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 &amp; (~this.umask))
 this.fmode = opt.fmode || (0o0666 &amp; (~this.umask))
 this.on('entry', entry =&gt; this[ONENTRY](entry))
 }
&nbsp;
 [MAYBECLOSE] () {
 if (this[ENDED] &amp;&amp; this[PENDING] === 0) {
 this.emit('prefinish')
 this.emit('finish')
 this.emit('end')
 this.emit('close')
 }
 }
&nbsp;
 [CHECKPATH] (entry) {
 if (this.strip) {
 const parts = entry.path.split(/\/|\\/)
 if (parts.length &lt; this.strip)
 return false
 entry.path = parts.slice(this.strip).join('/')
 }
&nbsp;
 if (!this.preservePaths) {
 const p = entry.path
 if (p.match(/(^|\/|\\)\.\.(\\|\/|$)/)) {
 this.warn('path contains \'..\'', p)
 return false
 }
&nbsp;
 // absolutes on posix are also absolutes on win32
 // so we only need to test this one to get both
 if (path.win32.isAbsolute(p)) {
 const parsed = path.win32.parse(p)
 this.warn('stripping ' + parsed.root + ' from absolute path', p)
 entry.path = p.substr(parsed.root.length)
 }
 }
&nbsp;
 // only encode : chars that aren't drive letter indicators
 if (this.win32) {
 const parsed = path.win32.parse(entry.path)
 entry.path = parsed.root === '' ? wc.encode(entry.path)
 : parsed.root + wc.encode(entry.path.substr(parsed.root.length))
 }
&nbsp;
 if (path.isAbsolute(entry.path))
 entry.absolute = entry.path
 else
 entry.absolute = path.resolve(this.cwd, entry.path)
&nbsp;
 return true
 }
&nbsp;
 [ONENTRY] (entry) {
 if (!this[CHECKPATH](entry))
 return entry.resume()
&nbsp;
 assert.equal(typeof entry.absolute, 'string')
&nbsp;
 switch (entry.type) {
 case 'Directory':
 case 'GNUDumpDir':
 if (entry.mode)
 entry.mode = entry.mode | 0o700
&nbsp;
 case 'File':
 case 'OldFile':
 case 'ContiguousFile':
 case 'Link':
 case 'SymbolicLink':
 return this[CHECKFS](entry)
&nbsp;
 case 'CharacterDevice':
 case 'BlockDevice':
 case 'FIFO':
 return this[UNSUPPORTED](entry)
 }
 }
&nbsp;
 [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()
 }
 }
&nbsp;
 [MKDIR] (dir, mode, cb) {
 mkdir(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)
 }
&nbsp;
 [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.preserveOwner &amp;&amp;
 ( typeof entry.uid === 'number' &amp;&amp; entry.uid !== this.processUid ||
 typeof entry.gid === 'number' &amp;&amp; entry.gid !== this.processGid )
 ||
 ( typeof this.uid === 'number' &amp;&amp; this.uid !== this.processUid ||
 typeof this.gid === 'number' &amp;&amp; this.gid !== this.processGid )
 }
&nbsp;
 [UID] (entry) {
 return uint32(this.uid, entry.uid, this.processUid)
 }
&nbsp;
 [GID] (entry) {
 return uint32(this.gid, entry.gid, this.processGid)
 }
&nbsp;
 [FILE] (entry) {
 const mode = entry.mode &amp; 0o7777 || this.fmode
 const stream = new fsm.WriteStream(entry.absolute, {
 mode: mode,
 autoClose: false
 })
 stream.on('error', er =&gt; this[ONERROR](er, entry))
&nbsp;
 let actions = 1
 const done = er =&gt; {
 if (er) {
 this[ONERROR](er, entry)
 actions = 1
 }
&nbsp;
 if (--actions === 0)
 fs.close(stream.fd, _ =&gt; this[UNPEND]())
 }
&nbsp;
 stream.on('finish', _ =&gt; {
 if (entry.mtime &amp;&amp; !this.noMtime) {
 actions++
 fs.futimes(stream.fd, entry.atime || new Date(), entry.mtime, done)
 }
&nbsp;
 if (this[DOCHOWN](entry)) {
 actions++
 fs.fchown(stream.fd, this[UID](entry), this[GID](entry), done)
 }
&nbsp;
 done()
 })
&nbsp;
 entry.pipe(stream)
 }
&nbsp;
 [DIRECTORY] (entry) {
 const mode = entry.mode &amp; 0o7777 || this.dmode
 this[MKDIR](entry.absolute, mode, er =&gt; {
 if (er)
 return this[ONERROR](er, entry)
&nbsp;
 let actions = 1
 const done = _ =&gt; {
 if (--actions === 0) {
 this[UNPEND]()
 entry.resume()
 }
 }
&nbsp;
 if (entry.mtime &amp;&amp; !this.noMtime) {
 actions++
 fs.utimes(entry.absolute, entry.atime || new Date(), entry.mtime, done)
 }
&nbsp;
 if (this[DOCHOWN](entry)) {
 actions++
 fs.chown(entry.absolute, this[UID](entry), this[GID](entry), done)
 }
&nbsp;
 done()
 })
 }
&nbsp;
 [UNSUPPORTED] (entry) {
 this.warn('unsupported entry type: ' + entry.type, entry)
 entry.resume()
 }
&nbsp;
 [SYMLINK] (entry) {
 this[LINK](entry, entry.linkpath, 'symlink')
 }
&nbsp;
 [HARDLINK] (entry) {
 this[LINK](entry, path.resolve(this.cwd, entry.linkpath), 'link')
 }
&nbsp;
 [PEND] () {
 this[PENDING]++
 }
&nbsp;
 [UNPEND] () {
 this[PENDING]--
 this[MAYBECLOSE]()
 }
&nbsp;
 [SKIP] (entry) {
 this[UNPEND]()
 entry.resume()
 }
&nbsp;
 // check if a thing is there, and if so, try to clobber it
 [CHECKFS] (entry) {
 this[PEND]()
 this[MKDIR](path.dirname(entry.absolute), this.dmode, er =&gt; {
 if (er)
 return this[ONERROR](er, entry)
 fs.lstat(entry.absolute, (er, st) =&gt; {
 if (st &amp;&amp; (this.keep || this.newer &amp;&amp; st.mtime &gt; entry.mtime))
 this[SKIP](entry)
 else if (er || (entry.type === 'File' &amp;&amp; !this.unlink &amp;&amp; st.isFile()))
 this[MAKEFS](null, entry)
 else if (st.isDirectory()) {
 if (entry.type === 'Directory') {
 if (!entry.mode || (st.mode &amp; 0o7777) === entry.mode)
 this[MAKEFS](null, entry)
 else
 fs.chmod(entry.absolute, entry.mode, er =&gt; this[MAKEFS](er, entry))
 } else
 fs.rmdir(entry.absolute, er =&gt; this[MAKEFS](er, entry))
 } else
 fs.unlink(entry.absolute, er =&gt; this[MAKEFS](er, entry))
 })
 })
 }
&nbsp;
 [MAKEFS] (er, entry) {
 if (er)
 return this[ONERROR](er, entry)
&nbsp;
 switch (entry.type) {
 case 'File':
 case 'OldFile':
 case 'ContiguousFile':
 return this[FILE](entry)
&nbsp;
 case 'Link':
 return this[HARDLINK](entry)
&nbsp;
 case 'SymbolicLink':
 return this[SYMLINK](entry)
&nbsp;
 case 'Directory':
 case 'GNUDumpDir':
 return this[DIRECTORY](entry)
 }
 }
&nbsp;
 [LINK] (entry, linkpath, link) {
 // XXX: get the type ('file' or 'dir') for windows
 fs[link](linkpath, entry.absolute, er =&gt; {
 if (er)
 return this[ONERROR](er, entry)
 this[UNPEND]()
 entry.resume()
 })
 }
}
&nbsp;
class UnpackSync extends Unpack {
 constructor (opt) {
 super(opt)
 }
&nbsp;
 [CHECKFS] (entry) {
 const er = this[MKDIR](path.dirname(entry.absolute), this.dmode)
 if (er)
 return this[ONERROR](er, entry)
 try {
 const st = fs.lstatSync(entry.absolute)
 if (this.keep || this.newer &amp;&amp; st.mtime &gt; entry.mtime)
 return this[SKIP](entry)
 else if (entry.type === 'File' &amp;&amp; !this.unlink &amp;&amp; st.isFile())
 return this[MAKEFS](null, entry)
 else {
 try {
 if (st.isDirectory()) {
 if (entry.type === 'Directory') {
 if (entry.mode &amp;&amp; (st.mode &amp; 0o7777) !== entry.mode)
 fs.chmodSync(entry.absolute, entry.mode)
 } else
 fs.rmdirSync(entry.absolute)
 } else
 fs.unlinkSync(entry.absolute)
 return this[MAKEFS](null, entry)
 } catch (er) {
 return this[ONERROR](er, entry)
 }
 }
 } catch (er) {
 return this[MAKEFS](null, entry)
 }
 }
&nbsp;
 [FILE] (entry) {
 const mode = entry.mode &amp; 0o7777 || this.fmode
&nbsp;
 const oner = er =&gt; {
 try { fs.closeSync(fd) } catch (_) {}
 this[ONERROR](er, entry)
 }
&nbsp;
 let stream
 let fd
 try {
 fd = fs.openSync(entry.absolute, 'w', mode)
 } catch (er) {
 return oner(er)
 }
&nbsp;
 entry.on('data', chunk =&gt; {
 try {
 fs.writeSync(fd, chunk, 0, chunk.length)
 } catch (er) {
 oner(er)
 }
 })
&nbsp;
 entry.on('end', _ =&gt; {
 try {
 if (entry.mtime &amp;&amp; !this.noMtime)
 fs.futimesSync(fd, entry.atime || new Date(), entry.mtime)
&nbsp;
 if (this[DOCHOWN](entry))
 fs.fchownSync(fd, this[UID](entry), this[GID](entry))
&nbsp;
 fs.closeSync(fd)
 } catch (er) {
 return oner(er)
 }
 })
&nbsp;
 }
&nbsp;
 [DIRECTORY] (entry) {
 const mode = entry.mode &amp; 0o7777 || this.dmode
 const er = this[MKDIR](entry.absolute, mode)
 if (er)
 return this[ONERROR](er, entry)
 if (entry.mtime &amp;&amp; !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()
 }
&nbsp;
 [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
 }
 }
&nbsp;
 [LINK] (entry, linkpath, link) {
 try {
 fs[link + 'Sync'](linkpath, entry.absolute)
 entry.resume()
 } catch (er) {
 return this[ONERROR](er, entry)
 }
 }
}
&nbsp;
Unpack.Sync = UnpackSync
module.exports = Unpack
&nbsp;</pre></td></tr>
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