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<a href="../../index.html">All files</a> / <a href="index.html">tar/lib</a> unpack.js
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<div class='fl pad1y space-right2'>
<span class="strong">100% </span>
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<span class="cline-any cline-neutral">&nbsp;</span></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>
</table></pre>
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