# All files / tar/lib write-entry.js

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97.87% Branches 184/188
100% Functions 31/31
99.53% Lines 210/211

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     'use strict'
    const MiniPass = require('minipass')
    const Pax = require('./pax.js')
    const Header = require('./header.js')
    const ReadEntry = require('./read-entry.js')
    const fs = require('fs')
    const path = require('path')

    const types = require('./types.js')
    const maxReadSize = 16 * 1024 * 1024
    const PROCESS = Symbol('process')
    const FILE = Symbol('file')
    const DIRECTORY = Symbol('directory')
    const SYMLINK = Symbol('symlink')
    const HARDLINK = Symbol('hardlink')
    const HEADER = Symbol('header')
    const READ = Symbol('read')
    const LSTAT = Symbol('lstat')
    const ONLSTAT = Symbol('onlstat')
    const ONREAD = Symbol('onread')
    const ONREADLINK = Symbol('onreadlink')
    const OPENFILE = Symbol('openfile')
    const ONOPENFILE = Symbol('onopenfile')
    const CLOSE = Symbol('close')
    const warner = require('./warn-mixin.js')
    const winchars = require('./winchars.js')

    const WriteEntry = warner(class WriteEntry extends MiniPass {
      constructor (p, opt) {
        opt = opt || {}
        super(opt)
        if (typeof p !== 'string')
          throw new TypeError('path is required')
        this.path = p
        // suppress atime, ctime, uid, gid, uname, gname
        this.portable = !!opt.portable
        // until node has builtin pwnam functions, this'll have to do
        this.myuid = process.getuid && process.getuid()
        this.myuser = process.env.USER || ''
        this.maxReadSize = opt.maxReadSize || maxReadSize
        this.linkCache = opt.linkCache || new Map()
        this.statCache = opt.statCache || new Map()
        this.preservePaths = !!opt.preservePaths
        this.cwd = opt.cwd || process.cwd()
        this.strict = !!opt.strict
        this.noPax = !!opt.noPax
        this.noMtime = !!opt.noMtime

        if (typeof opt.onwarn === 'function')
          this.on('warn', opt.onwarn)

        if (!this.preservePaths && path.win32.isAbsolute(p)) {
          // absolutes on posix are also absolutes on win32
          // so we only need to test this one to get both
          const parsed = path.win32.parse(p)
          this.warn('stripping ' + parsed.root + ' from absolute path', p)
          this.path = p.substr(parsed.root.length)
        }

        this.win32 = !!opt.win32 || process.platform === 'win32'
        if (this.win32) {
          this.path = winchars.decode(this.path.replace(/\\/g, '/'))
          p = p.replace(/\\/g, '/')
        }

        this.absolute = opt.absolute || path.resolve(this.cwd, p)

        if (this.path === '')
          this.path = './'

        if (this.statCache.has(this.absolute))
          this[ONLSTAT](this.statCache.get(this.absolute))
        else
          this[LSTAT]()
      }

      [LSTAT] () {
        fs.lstat(this.absolute, (er, stat) => {
          if (er)
            return this.emit('error', er)
          this[ONLSTAT](stat)
        })
      }

      [ONLSTAT] (stat) {
        this.statCache.set(this.absolute, stat)
        this.stat = stat
        if (!stat.isFile())
          stat.size = 0
        this.type = getType(stat)
        this.emit('stat', stat)
        this[PROCESS]()
      }

      [PROCESS] () {
        switch (this.type) {
          case 'File': return this[FILE]()
          case 'Directory': return this[DIRECTORY]()
          case 'SymbolicLink': return this[SYMLINK]()
          // unsupported types are ignored.
          default: return this.end()
        }
      }

      [HEADER] () {
        if (this.type === 'Directory' && this.portable)
          this.noMtime = true

        this.header = new Header({
          path: this.path,
          linkpath: this.linkpath,
          // only the permissions and setuid/setgid/sticky bitflags
          // not the higher-order bits that specify file type
          mode: this.stat.mode & 0o7777,
          uid: this.portable ? null : this.stat.uid,
          gid: this.portable ? null : this.stat.gid,
          size: this.stat.size,
          mtime: this.noMtime ? null : this.stat.mtime,
          type: this.type,
          uname: this.portable ? null :
            this.stat.uid === this.myuid ? this.myuser : '',
          atime: this.portable ? null : this.stat.atime,
          ctime: this.portable ? null : this.stat.ctime
        })

        if (this.header.encode() && !this.noPax)
          this.write(new Pax({
            atime: this.portable ? null : this.header.atime,
            ctime: this.portable ? null : this.header.ctime,
            gid: this.portable ? null : this.header.gid,
            mtime: this.noMtime ? null : this.header.mtime,
            path: this.path,
            linkpath: this.linkpath,
            size: this.header.size,
            uid: this.portable ? null : this.header.uid,
            uname: this.portable ? null : this.header.uname,
            dev: this.portable ? null : this.stat.dev,
            ino: this.portable ? null : this.stat.ino,
            nlink: this.portable ? null : this.stat.nlink
          }).encode())
        this.write(this.header.block)
      }

      [DIRECTORY] () {
        if (this.path.substr(-1) !== '/')
          this.path += '/'
        this.stat.size = 0
        this[HEADER]()
        this.end()
      }

      [SYMLINK] () {
        fs.readlink(this.absolute, (er, linkpath) => {
          if (er)
            return this.emit('error', er)
          this[ONREADLINK](linkpath)
        })
      }

      [ONREADLINK] (linkpath) {
        this.linkpath = linkpath
        this[HEADER]()
        this.end()
      }

      [HARDLINK] (linkpath) {
        this.type = 'Link'
        this.linkpath = path.relative(this.cwd, linkpath)
        this.stat.size = 0
        this[HEADER]()
        this.end()
      }

      [FILE] () {
        if (this.stat.nlink > 1) {
          const linkKey = this.stat.dev + ':' + this.stat.ino
          if (this.linkCache.has(linkKey)) {
            const linkpath = this.linkCache.get(linkKey)
            if (linkpath.indexOf(this.cwd) === 0)
              return this[HARDLINK](linkpath)
          }
          this.linkCache.set(linkKey, this.absolute)
        }

        this[HEADER]()
        if (this.stat.size === 0)
          return this.end()

        this[OPENFILE]()
      }

      [OPENFILE] () {
        fs.open(this.absolute, 'r', (er, fd) => {
          if (er)
            return this.emit('error', er)
          this[ONOPENFILE](fd)
        })
      }

      [ONOPENFILE] (fd) {
        const blockLen = 512 * Math.ceil(this.stat.size / 512)
        const bufLen = Math.min(blockLen, this.maxReadSize)
        const buf = Buffer.allocUnsafe(bufLen)
        this[READ](fd, buf, 0, buf.length, 0, this.stat.size, blockLen)
      }

      [READ] (fd, buf, offset, length, pos, remain, blockRemain) {
        fs.read(fd, buf, offset, length, pos, (er, bytesRead) => {
          if (er)
            return this[CLOSE](fd, _ => this.emit('error', er))
          this[ONREAD](fd, buf, offset, length, pos, remain, blockRemain, bytesRead)
        })
      }

      [CLOSE] (fd, cb) {
        fs.close(fd, cb)
      }

      [ONREAD] (fd, buf, offset, length, pos, remain, blockRemain, bytesRead) {
        if (bytesRead <= 0 && remain > 0) {
          const er = new Error('unexpected EOF')
          er.path = this.absolute
          er.syscall = 'read'
          er.code = 'EOF'
          this.emit('error', er)
        }

        // null out the rest of the buffer, if we could fit the block padding
        if (bytesRead === remain) {
          for (let i = bytesRead; i < length && bytesRead < blockRemain; i++) {
            buf[i + offset] = 0
            bytesRead ++
            remain ++
          }
        }

        const writeBuf = offset === 0 && bytesRead === buf.length ?
          buf : buf.slice(offset, offset + bytesRead)
        remain -= bytesRead
        blockRemain -= bytesRead
        pos += bytesRead
        offset += bytesRead

        this.write(writeBuf)

        if (!remain) {
          if (blockRemain)
            this.write(Buffer.alloc(blockRemain))
          this.end()
          this[CLOSE](fd, _ => _)
          return
        }

        if (offset >= length) {
          buf = Buffer.allocUnsafe(length)
          offset = 0
        }
        length = buf.length - offset
        this[READ](fd, buf, offset, length, pos, remain, blockRemain)
      }
    })

    class WriteEntrySync extends WriteEntry {
      constructor (path, opt) {
        super(path, opt)
      }

      [LSTAT] () {
        this[ONLSTAT](fs.lstatSync(this.absolute))
      }

      [SYMLINK] () {
        this[ONREADLINK](fs.readlinkSync(this.absolute))
      }

      [OPENFILE] () {
        this[ONOPENFILE](fs.openSync(this.absolute, 'r'))
      }

      [READ] (fd, buf, offset, length, pos, remain, blockRemain) {
        let threw = true
        try {
          const bytesRead = fs.readSync(fd, buf, offset, length, pos)
          this[ONREAD](fd, buf, offset, length, pos, remain, blockRemain, bytesRead)
          threw = false
        } finally {
          if (threw)
            try { this[CLOSE](fd) } catch (er) {}
        }
      }

      [CLOSE] (fd) {
        fs.closeSync(fd)
      }
    }

    const WriteEntryTar = warner(class WriteEntryTar extends MiniPass {
      constructor (readEntry, opt) {
        opt = opt || {}
        super(opt)
        this.preservePaths = !!opt.preservePaths
        this.portable = !!opt.portable
        this.strict = !!opt.strict
        this.noPax = !!opt.noPax
        this.noMtime = !!opt.noMtime

        this.readEntry = readEntry
        this.type = readEntry.type
        Iif (this.type === 'Directory' && this.portable)
          this.noMtime = true

        this.path = readEntry.path
        this.mode = readEntry.mode
        if (this.mode)
          this.mode = this.mode & 0o7777
        this.uid = this.portable ? null : readEntry.uid
        this.gid = this.portable ? null : readEntry.gid
        this.uname = this.portable ? null : readEntry.uname
        this.gname = this.portable ? null : readEntry.gname
        this.size = readEntry.size
        this.mtime = this.noMtime ? null : readEntry.mtime
        this.atime = this.portable ? null : readEntry.atime
        this.ctime = this.portable ? null : readEntry.ctime
        this.linkpath = readEntry.linkpath

        if (typeof opt.onwarn === 'function')
          this.on('warn', opt.onwarn)

        if (path.isAbsolute(this.path) && !this.preservePaths) {
          const parsed = path.parse(this.path)
          this.warn(
            'stripping ' + parsed.root + ' from absolute path',
            this.path
          )
          this.path = this.path.substr(parsed.root.length)
        }

        this.remain = readEntry.size
        this.blockRemain = readEntry.startBlockSize

        this.header = new Header({
          path: this.path,
          linkpath: this.linkpath,
          // only the permissions and setuid/setgid/sticky bitflags
          // not the higher-order bits that specify file type
          mode: this.mode,
          uid: this.portable ? null : this.uid,
          gid: this.portable ? null : this.gid,
          size: this.size,
          mtime: this.noMtime ? null : this.mtime,
          type: this.type,
          uname: this.portable ? null : this.uname,
          atime: this.portable ? null : this.atime,
          ctime: this.portable ? null : this.ctime
        })

        if (this.header.encode() && !this.noPax)
          super.write(new Pax({
            atime: this.portable ? null : this.atime,
            ctime: this.portable ? null : this.ctime,
            gid: this.portable ? null : this.gid,
            mtime: this.noMtime ? null : this.mtime,
            path: this.path,
            linkpath: this.linkpath,
            size: this.size,
            uid: this.portable ? null : this.uid,
            uname: this.portable ? null : this.uname,
            dev: this.portable ? null : this.readEntry.dev,
            ino: this.portable ? null : this.readEntry.ino,
            nlink: this.portable ? null : this.readEntry.nlink
          }).encode())

        super.write(this.header.block)
        readEntry.pipe(this)
      }

      write (data) {
        const writeLen = data.length
        if (writeLen > this.blockRemain)
          throw new Error('writing more to entry than is appropriate')
        this.blockRemain -= writeLen
        return super.write(data)
      }

      end () {
        if (this.blockRemain)
          this.write(Buffer.alloc(this.blockRemain))
        return super.end()
      }
    })

    WriteEntry.Sync = WriteEntrySync
    WriteEntry.Tar = WriteEntryTar

    const getType = stat =>
      stat.isFile() ? 'File'
      : stat.isDirectory() ? 'Directory'
      : stat.isSymbolicLink() ? 'SymbolicLink'
      : 'Unsupported'

    module.exports = WriteEntry