525 lines
15 KiB
JavaScript
525 lines
15 KiB
JavaScript
'use strict'
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const MiniPass = require('minipass')
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const Pax = require('./pax.js')
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const Header = require('./header.js')
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const fs = require('fs')
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const path = require('path')
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const normPath = require('./normalize-windows-path.js')
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const stripSlash = require('./strip-trailing-slashes.js')
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const prefixPath = (path, prefix) => {
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if (!prefix)
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return normPath(path)
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path = normPath(path).replace(/^\.(\/|$)/, '')
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return stripSlash(prefix) + '/' + path
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}
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const maxReadSize = 16 * 1024 * 1024
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const PROCESS = Symbol('process')
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const FILE = Symbol('file')
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const DIRECTORY = Symbol('directory')
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const SYMLINK = Symbol('symlink')
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const HARDLINK = Symbol('hardlink')
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const HEADER = Symbol('header')
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const READ = Symbol('read')
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const LSTAT = Symbol('lstat')
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const ONLSTAT = Symbol('onlstat')
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const ONREAD = Symbol('onread')
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const ONREADLINK = Symbol('onreadlink')
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const OPENFILE = Symbol('openfile')
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const ONOPENFILE = Symbol('onopenfile')
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const CLOSE = Symbol('close')
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const MODE = Symbol('mode')
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const AWAITDRAIN = Symbol('awaitDrain')
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const ONDRAIN = Symbol('ondrain')
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const PREFIX = Symbol('prefix')
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const HAD_ERROR = Symbol('hadError')
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const warner = require('./warn-mixin.js')
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const winchars = require('./winchars.js')
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const stripAbsolutePath = require('./strip-absolute-path.js')
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const modeFix = require('./mode-fix.js')
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const WriteEntry = warner(class WriteEntry extends MiniPass {
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constructor (p, opt) {
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opt = opt || {}
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super(opt)
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if (typeof p !== 'string')
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throw new TypeError('path is required')
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this.path = normPath(p)
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// suppress atime, ctime, uid, gid, uname, gname
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this.portable = !!opt.portable
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// until node has builtin pwnam functions, this'll have to do
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this.myuid = process.getuid && process.getuid() || 0
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this.myuser = process.env.USER || ''
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this.maxReadSize = opt.maxReadSize || maxReadSize
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this.linkCache = opt.linkCache || new Map()
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this.statCache = opt.statCache || new Map()
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this.preservePaths = !!opt.preservePaths
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this.cwd = normPath(opt.cwd || process.cwd())
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this.strict = !!opt.strict
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this.noPax = !!opt.noPax
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this.noMtime = !!opt.noMtime
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this.mtime = opt.mtime || null
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this.prefix = opt.prefix ? normPath(opt.prefix) : null
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this.fd = null
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this.blockLen = null
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this.blockRemain = null
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this.buf = null
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this.offset = null
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this.length = null
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this.pos = null
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this.remain = null
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if (typeof opt.onwarn === 'function')
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this.on('warn', opt.onwarn)
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let pathWarn = false
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if (!this.preservePaths) {
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const [root, stripped] = stripAbsolutePath(this.path)
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if (root) {
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this.path = stripped
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pathWarn = root
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}
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}
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this.win32 = !!opt.win32 || process.platform === 'win32'
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if (this.win32) {
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// force the \ to / normalization, since we might not *actually*
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// be on windows, but want \ to be considered a path separator.
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this.path = winchars.decode(this.path.replace(/\\/g, '/'))
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p = p.replace(/\\/g, '/')
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}
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this.absolute = normPath(opt.absolute || path.resolve(this.cwd, p))
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if (this.path === '')
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this.path = './'
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if (pathWarn) {
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this.warn('TAR_ENTRY_INFO', `stripping ${pathWarn} from absolute path`, {
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entry: this,
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path: pathWarn + this.path,
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})
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}
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if (this.statCache.has(this.absolute))
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this[ONLSTAT](this.statCache.get(this.absolute))
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else
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this[LSTAT]()
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}
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emit (ev, ...data) {
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if (ev === 'error')
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this[HAD_ERROR] = true
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return super.emit(ev, ...data)
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}
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[LSTAT] () {
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fs.lstat(this.absolute, (er, stat) => {
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if (er)
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return this.emit('error', er)
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this[ONLSTAT](stat)
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})
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}
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[ONLSTAT] (stat) {
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this.statCache.set(this.absolute, stat)
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this.stat = stat
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if (!stat.isFile())
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stat.size = 0
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this.type = getType(stat)
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this.emit('stat', stat)
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this[PROCESS]()
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}
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[PROCESS] () {
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switch (this.type) {
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case 'File': return this[FILE]()
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case 'Directory': return this[DIRECTORY]()
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case 'SymbolicLink': return this[SYMLINK]()
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// unsupported types are ignored.
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default: return this.end()
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}
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}
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[MODE] (mode) {
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return modeFix(mode, this.type === 'Directory', this.portable)
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}
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[PREFIX] (path) {
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return prefixPath(path, this.prefix)
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}
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[HEADER] () {
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if (this.type === 'Directory' && this.portable)
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this.noMtime = true
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this.header = new Header({
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path: this[PREFIX](this.path),
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// only apply the prefix to hard links.
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linkpath: this.type === 'Link' ? this[PREFIX](this.linkpath)
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: this.linkpath,
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// only the permissions and setuid/setgid/sticky bitflags
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// not the higher-order bits that specify file type
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mode: this[MODE](this.stat.mode),
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uid: this.portable ? null : this.stat.uid,
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gid: this.portable ? null : this.stat.gid,
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size: this.stat.size,
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mtime: this.noMtime ? null : this.mtime || this.stat.mtime,
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type: this.type,
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uname: this.portable ? null :
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this.stat.uid === this.myuid ? this.myuser : '',
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atime: this.portable ? null : this.stat.atime,
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ctime: this.portable ? null : this.stat.ctime,
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})
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if (this.header.encode() && !this.noPax) {
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super.write(new Pax({
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atime: this.portable ? null : this.header.atime,
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ctime: this.portable ? null : this.header.ctime,
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gid: this.portable ? null : this.header.gid,
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mtime: this.noMtime ? null : this.mtime || this.header.mtime,
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path: this[PREFIX](this.path),
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linkpath: this.type === 'Link' ? this[PREFIX](this.linkpath)
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: this.linkpath,
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size: this.header.size,
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uid: this.portable ? null : this.header.uid,
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uname: this.portable ? null : this.header.uname,
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dev: this.portable ? null : this.stat.dev,
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ino: this.portable ? null : this.stat.ino,
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nlink: this.portable ? null : this.stat.nlink,
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}).encode())
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}
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super.write(this.header.block)
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}
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[DIRECTORY] () {
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if (this.path.substr(-1) !== '/')
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this.path += '/'
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this.stat.size = 0
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this[HEADER]()
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this.end()
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}
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[SYMLINK] () {
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fs.readlink(this.absolute, (er, linkpath) => {
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if (er)
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return this.emit('error', er)
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this[ONREADLINK](linkpath)
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})
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}
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[ONREADLINK] (linkpath) {
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this.linkpath = normPath(linkpath)
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this[HEADER]()
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this.end()
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}
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[HARDLINK] (linkpath) {
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this.type = 'Link'
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this.linkpath = normPath(path.relative(this.cwd, linkpath))
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this.stat.size = 0
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this[HEADER]()
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this.end()
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}
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[FILE] () {
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if (this.stat.nlink > 1) {
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const linkKey = this.stat.dev + ':' + this.stat.ino
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if (this.linkCache.has(linkKey)) {
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const linkpath = this.linkCache.get(linkKey)
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if (linkpath.indexOf(this.cwd) === 0)
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return this[HARDLINK](linkpath)
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}
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this.linkCache.set(linkKey, this.absolute)
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}
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this[HEADER]()
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if (this.stat.size === 0)
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return this.end()
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this[OPENFILE]()
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}
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[OPENFILE] () {
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fs.open(this.absolute, 'r', (er, fd) => {
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if (er)
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return this.emit('error', er)
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this[ONOPENFILE](fd)
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})
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}
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[ONOPENFILE] (fd) {
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this.fd = fd
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if (this[HAD_ERROR])
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return this[CLOSE]()
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this.blockLen = 512 * Math.ceil(this.stat.size / 512)
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this.blockRemain = this.blockLen
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const bufLen = Math.min(this.blockLen, this.maxReadSize)
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this.buf = Buffer.allocUnsafe(bufLen)
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this.offset = 0
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this.pos = 0
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this.remain = this.stat.size
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this.length = this.buf.length
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this[READ]()
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}
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[READ] () {
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const { fd, buf, offset, length, pos } = this
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fs.read(fd, buf, offset, length, pos, (er, bytesRead) => {
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if (er) {
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// ignoring the error from close(2) is a bad practice, but at
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// this point we already have an error, don't need another one
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return this[CLOSE](() => this.emit('error', er))
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}
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this[ONREAD](bytesRead)
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})
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}
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[CLOSE] (cb) {
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fs.close(this.fd, cb)
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}
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[ONREAD] (bytesRead) {
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if (bytesRead <= 0 && this.remain > 0) {
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const er = new Error('encountered unexpected EOF')
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er.path = this.absolute
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er.syscall = 'read'
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er.code = 'EOF'
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return this[CLOSE](() => this.emit('error', er))
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}
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if (bytesRead > this.remain) {
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const er = new Error('did not encounter expected EOF')
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er.path = this.absolute
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er.syscall = 'read'
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er.code = 'EOF'
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return this[CLOSE](() => this.emit('error', er))
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}
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// null out the rest of the buffer, if we could fit the block padding
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// at the end of this loop, we've incremented bytesRead and this.remain
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// to be incremented up to the blockRemain level, as if we had expected
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// to get a null-padded file, and read it until the end. then we will
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// decrement both remain and blockRemain by bytesRead, and know that we
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// reached the expected EOF, without any null buffer to append.
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if (bytesRead === this.remain) {
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for (let i = bytesRead; i < this.length && bytesRead < this.blockRemain; i++) {
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this.buf[i + this.offset] = 0
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bytesRead++
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this.remain++
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}
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}
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const writeBuf = this.offset === 0 && bytesRead === this.buf.length ?
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this.buf : this.buf.slice(this.offset, this.offset + bytesRead)
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const flushed = this.write(writeBuf)
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if (!flushed)
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this[AWAITDRAIN](() => this[ONDRAIN]())
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else
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this[ONDRAIN]()
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}
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[AWAITDRAIN] (cb) {
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this.once('drain', cb)
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}
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write (writeBuf) {
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if (this.blockRemain < writeBuf.length) {
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const er = new Error('writing more data than expected')
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er.path = this.absolute
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return this.emit('error', er)
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}
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this.remain -= writeBuf.length
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this.blockRemain -= writeBuf.length
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this.pos += writeBuf.length
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this.offset += writeBuf.length
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return super.write(writeBuf)
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}
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[ONDRAIN] () {
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if (!this.remain) {
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if (this.blockRemain)
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super.write(Buffer.alloc(this.blockRemain))
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return this[CLOSE](er => er ? this.emit('error', er) : this.end())
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}
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if (this.offset >= this.length) {
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// if we only have a smaller bit left to read, alloc a smaller buffer
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// otherwise, keep it the same length it was before.
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this.buf = Buffer.allocUnsafe(Math.min(this.blockRemain, this.buf.length))
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this.offset = 0
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}
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this.length = this.buf.length - this.offset
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this[READ]()
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}
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})
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class WriteEntrySync extends WriteEntry {
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[LSTAT] () {
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this[ONLSTAT](fs.lstatSync(this.absolute))
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}
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[SYMLINK] () {
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this[ONREADLINK](fs.readlinkSync(this.absolute))
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}
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[OPENFILE] () {
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this[ONOPENFILE](fs.openSync(this.absolute, 'r'))
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}
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[READ] () {
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let threw = true
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try {
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const { fd, buf, offset, length, pos } = this
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const bytesRead = fs.readSync(fd, buf, offset, length, pos)
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this[ONREAD](bytesRead)
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threw = false
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} finally {
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// ignoring the error from close(2) is a bad practice, but at
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// this point we already have an error, don't need another one
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if (threw) {
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try {
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this[CLOSE](() => {})
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} catch (er) {}
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}
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}
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}
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[AWAITDRAIN] (cb) {
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cb()
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}
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[CLOSE] (cb) {
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fs.closeSync(this.fd)
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cb()
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}
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}
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const WriteEntryTar = warner(class WriteEntryTar extends MiniPass {
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constructor (readEntry, opt) {
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opt = opt || {}
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super(opt)
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this.preservePaths = !!opt.preservePaths
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this.portable = !!opt.portable
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this.strict = !!opt.strict
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this.noPax = !!opt.noPax
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this.noMtime = !!opt.noMtime
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this.readEntry = readEntry
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this.type = readEntry.type
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if (this.type === 'Directory' && this.portable)
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this.noMtime = true
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this.prefix = opt.prefix || null
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this.path = normPath(readEntry.path)
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this.mode = this[MODE](readEntry.mode)
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this.uid = this.portable ? null : readEntry.uid
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this.gid = this.portable ? null : readEntry.gid
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this.uname = this.portable ? null : readEntry.uname
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this.gname = this.portable ? null : readEntry.gname
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this.size = readEntry.size
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this.mtime = this.noMtime ? null : opt.mtime || readEntry.mtime
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this.atime = this.portable ? null : readEntry.atime
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this.ctime = this.portable ? null : readEntry.ctime
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this.linkpath = normPath(readEntry.linkpath)
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if (typeof opt.onwarn === 'function')
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this.on('warn', opt.onwarn)
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let pathWarn = false
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if (!this.preservePaths) {
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const [root, stripped] = stripAbsolutePath(this.path)
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if (root) {
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this.path = stripped
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pathWarn = root
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}
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}
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this.remain = readEntry.size
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this.blockRemain = readEntry.startBlockSize
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this.header = new Header({
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path: this[PREFIX](this.path),
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linkpath: this.type === 'Link' ? this[PREFIX](this.linkpath)
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: this.linkpath,
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// only the permissions and setuid/setgid/sticky bitflags
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// not the higher-order bits that specify file type
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mode: this.mode,
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uid: this.portable ? null : this.uid,
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gid: this.portable ? null : this.gid,
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size: this.size,
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mtime: this.noMtime ? null : this.mtime,
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type: this.type,
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uname: this.portable ? null : this.uname,
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atime: this.portable ? null : this.atime,
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ctime: this.portable ? null : this.ctime,
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})
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if (pathWarn) {
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this.warn('TAR_ENTRY_INFO', `stripping ${pathWarn} from absolute path`, {
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entry: this,
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path: pathWarn + this.path,
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})
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}
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if (this.header.encode() && !this.noPax) {
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super.write(new Pax({
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atime: this.portable ? null : this.atime,
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ctime: this.portable ? null : this.ctime,
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gid: this.portable ? null : this.gid,
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mtime: this.noMtime ? null : this.mtime,
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path: this[PREFIX](this.path),
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linkpath: this.type === 'Link' ? this[PREFIX](this.linkpath)
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: this.linkpath,
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size: this.size,
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uid: this.portable ? null : this.uid,
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uname: this.portable ? null : this.uname,
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dev: this.portable ? null : this.readEntry.dev,
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ino: this.portable ? null : this.readEntry.ino,
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nlink: this.portable ? null : this.readEntry.nlink,
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}).encode())
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}
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super.write(this.header.block)
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readEntry.pipe(this)
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}
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[PREFIX] (path) {
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return prefixPath(path, this.prefix)
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}
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[MODE] (mode) {
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return modeFix(mode, this.type === 'Directory', this.portable)
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}
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write (data) {
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const writeLen = data.length
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if (writeLen > this.blockRemain)
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throw new Error('writing more to entry than is appropriate')
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this.blockRemain -= writeLen
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return super.write(data)
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}
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end () {
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if (this.blockRemain)
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super.write(Buffer.alloc(this.blockRemain))
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return super.end()
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}
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})
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WriteEntry.Sync = WriteEntrySync
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WriteEntry.Tar = WriteEntryTar
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const getType = stat =>
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stat.isFile() ? 'File'
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: stat.isDirectory() ? 'Directory'
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: stat.isSymbolicLink() ? 'SymbolicLink'
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: 'Unsupported'
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module.exports = WriteEntry
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