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writer.js

module.exports = Writer

var fs = require('graceful-fs')
var inherits = require('inherits')
var rimraf = require('rimraf')
var mkdir = require('mkdirp')
var path = require('path')
var umask = process.platform === 'win32' ? 0 : process.umask()
var getType = require('./get-type.js')
var Abstract = require('./abstract.js')

// Must do this *before* loading the child classes
inherits(Writer, Abstract)

Writer.dirmode = parseInt('0777', 8) & (~umask)
Writer.filemode = parseInt('0666', 8) & (~umask)

var DirWriter = require('./dir-writer.js')
var LinkWriter = require('./link-writer.js')
var FileWriter = require('./file-writer.js')
var ProxyWriter = require('./proxy-writer.js')

// props is the desired state.  current is optionally the current stat,
// provided here so that subclasses can avoid statting the target
// more than necessary.
function Writer (props, current) {
  var self = this

if (typeof props === 'string') {
    props = { path: props }
  }

// polymorphism.
  // call fstream.Writer(dir) to get a DirWriter object, etc.
  var type = getType(props)
  var ClassType = Writer

switch (type) {
    case 'Directory':
      ClassType = DirWriter
      break
    case 'File':
      ClassType = FileWriter
      break
    case 'Link':
    case 'SymbolicLink':
      ClassType = LinkWriter
      break
    case null:
    default:
      // Don't know yet what type to create, so we wrap in a proxy.
      ClassType = ProxyWriter
      break
  }

if (!(self instanceof ClassType)) return new ClassType(props)

// now get down to business.

Abstract.call(self)

if (!props.path) self.error('Must provide a path', null, true)

// props is what we want to set.
  // set some convenience properties as well.
  self.type = props.type
  self.props = props
  self.depth = props.depth || 0
  self.clobber = props.clobber === false ? props.clobber : true
  self.parent = props.parent || null
  self.root = props.root || (props.parent && props.parent.root) || self

self._path = self.path = path.resolve(props.path)
  if (process.platform === 'win32') {
    self.path = self._path = self.path.replace(/\?/g, '_')
    if (self._path.length >= 260) {
      self._swallowErrors = true
      self._path = '\\\\?\\' + self.path.replace(/\//g, '\\')
    }
  }
  self.basename = path.basename(props.path)
  self.dirname = path.dirname(props.path)
  self.linkpath = props.linkpath || null

props.parent = props.root = null

// console.error("\n\n\n%s setting size to", props.path, props.size)
  self.size = props.size

if (typeof props.mode === 'string') {
    props.mode = parseInt(props.mode, 8)
  }

self.readable = false
  self.writable = true

// buffer until ready, or while handling another entry
  self._buffer = []
  self.ready = false

self.filter = typeof props.filter === 'function' ? props.filter : null

// start the ball rolling.
  // this checks what's there already, and then calls
  // self._create() to call the impl-specific creation stuff.
  self._stat(current)
}

// Calling this means that it's something we can't create.
// Just assert that it's already there, otherwise raise a warning.
Writer.prototype._create = function () {
  var self = this
  fs[self.props.follow ? 'stat' : 'lstat'](self._path, function (er) {
    if (er) {
      return self.warn('Cannot create ' + self._path + '\n' +
        'Unsupported type: ' + self.type, 'ENOTSUP')
    }
    self._finish()
  })
}

Writer.prototype._stat = function (current) {
  var self = this
  var props = self.props
  var stat = props.follow ? 'stat' : 'lstat'
  var who = self._proxy || self

if (current) statCb(null, current)
  else fs[stat](self._path, statCb)

function statCb (er, current) {
    if (self.filter && !self.filter.call(who, who, current)) {
      self._aborted = true
      self.emit('end')
      self.emit('close')
      return
    }

// if it's not there, great.  We'll just create it.
    // if it is there, then we'll need to change whatever differs
    if (er || !current) {
      return create(self)
    }

self._old = current
    var currentType = getType(current)

// if it's a type change, then we need to clobber or error.
    // if it's not a type change, then let the impl take care of it.
    if (currentType !== self.type) {
      return rimraf(self._path, function (er) {
        if (er) return self.error(er)
        self._old = null
        create(self)
      })
    }

// otherwise, just handle in the app-specific way
    // this creates a fs.WriteStream, or mkdir's, or whatever
    create(self)
  }
}

function create (self) {
  // console.error("W create", self._path, Writer.dirmode)

// XXX Need to clobber non-dirs that are in the way,
  // unless { clobber: false } in the props.
  mkdir(path.dirname(self._path), Writer.dirmode, function (er, made) {
    // console.error("W created", path.dirname(self._path), er)
    if (er) return self.error(er)

// later on, we have to set the mode and owner for these
    self._madeDir = made
    return self._create()
  })
}

function endChmod (self, want, current, path, cb) {
  var wantMode = want.mode
  var chmod = want.follow || self.type !== 'SymbolicLink'
    ? 'chmod' : 'lchmod'

if (!fs[chmod]) return cb()
  if (typeof wantMode !== 'number') return cb()

var curMode = current.mode & parseInt('0777', 8)
  wantMode = wantMode & parseInt('0777', 8)
  if (wantMode === curMode) return cb()

fs[chmod](path, wantMode, cb)
}

function endChown (self, want, current, path, cb) {
  // Don't even try it unless root.  Too easy to EPERM.
  if (process.platform === 'win32') return cb()
  if (!process.getuid || process.getuid() !== 0) return cb()
  if (typeof want.uid !== 'number' &&
    typeof want.gid !== 'number') return cb()

if (current.uid === want.uid &&
    current.gid === want.gid) return cb()

var chown = (self.props.follow || self.type !== 'SymbolicLink')
    ? 'chown' : 'lchown'
  if (!fs[chown]) return cb()

if (typeof want.uid !== 'number') want.uid = current.uid
  if (typeof want.gid !== 'number') want.gid = current.gid

fs[chown](path, want.uid, want.gid, cb)
}

function endUtimes (self, want, current, path, cb) {
  if (!fs.utimes || process.platform === 'win32') return cb()

var utimes = (want.follow || self.type !== 'SymbolicLink')
    ? 'utimes' : 'lutimes'

if (utimes === 'lutimes' && !fs[utimes]) {
    utimes = 'utimes'
  }

if (!fs[utimes]) return cb()

var curA = current.atime
  var curM = current.mtime
  var meA = want.atime
  var meM = want.mtime

if (meA === undefined) meA = curA
  if (meM === undefined) meM = curM

if (!isDate(meA)) meA = new Date(meA)
  if (!isDate(meM)) meA = new Date(meM)

if (meA.getTime() === curA.getTime() &&
    meM.getTime() === curM.getTime()) return cb()

fs[utimes](path, meA, meM, cb)
}

// XXX This function is beastly.  Break it up!
Writer.prototype._finish = function () {
  var self = this

if (self._finishing) return
  self._finishing = true

// console.error(" W Finish", self._path, self.size)

// set up all the things.
  // At this point, we're already done writing whatever we've gotta write,
  // adding files to the dir, etc.
  var todo = 0
  var errState = null
  var done = false

if (self._old) {
    // the times will almost *certainly* have changed.
    // adds the utimes syscall, but remove another stat.
    self._old.atime = new Date(0)
    self._old.mtime = new Date(0)
    // console.error(" W Finish Stale Stat", self._path, self.size)
    setProps(self._old)
  } else {
    var stat = self.props.follow ? 'stat' : 'lstat'
    // console.error(" W Finish Stating", self._path, self.size)
    fs[stat](self._path, function (er, current) {
      // console.error(" W Finish Stated", self._path, self.size, current)
      if (er) {
        // if we're in the process of writing out a
        // directory, it's very possible that the thing we're linking to
        // doesn't exist yet (especially if it was intended as a symlink),
        // so swallow ENOENT errors here and just soldier on.
        if (er.code === 'ENOENT' &&
          (self.type === 'Link' || self.type === 'SymbolicLink') &&
          process.platform === 'win32') {
          self.ready = true
          self.emit('ready')
          self.emit('end')
          self.emit('close')
          self.end = self._finish = function () {}
          return
        } else return self.error(er)
      }
      setProps(self._old = current)
    })
  }

return

function setProps (current) {
    todo += 3
    endChmod(self, self.props, current, self._path, next('chmod'))
    endChown(self, self.props, current, self._path, next('chown'))
    endUtimes(self, self.props, current, self._path, next('utimes'))
  }

function next (what) {
    return function (er) {
      // console.error("   W Finish", what, todo)
      if (errState) return
      if (er) {
        er.fstream_finish_call = what
        return self.error(errState = er)
      }
      if (--todo > 0) return
      if (done) return
      done = true

// we may still need to set the mode/etc. on some parent dirs
      // that were created previously.  delay end/close until then.
      if (!self._madeDir) return end()
      else endMadeDir(self, self._path, end)

function end (er) {
        if (er) {
          er.fstream_finish_call = 'setupMadeDir'
          return self.error(er)
        }
        // all the props have been set, so we're completely done.
        self.emit('end')
        self.emit('close')
      }
    }
  }
}

function endMadeDir (self, p, cb) {
  var made = self._madeDir
  // everything *between* made and path.dirname(self._path)
  // needs to be set up.  Note that this may just be one dir.
  var d = path.dirname(p)

endMadeDir_(self, d, function (er) {
    if (er) return cb(er)
    if (d === made) {
      return cb()
    }
    endMadeDir(self, d, cb)
  })
}

function endMadeDir_ (self, p, cb) {
  var dirProps = {}
  Object.keys(self.props).forEach(function (k) {
    dirProps[k] = self.props[k]

// only make non-readable dirs if explicitly requested.
    if (k === 'mode' && self.type !== 'Directory') {
      dirProps[k] = dirProps[k] | parseInt('0111', 8)
    }
  })

var todo = 3
  var errState = null
  fs.stat(p, function (er, current) {
    if (er) return cb(errState = er)
    endChmod(self, dirProps, current, p, next)
    endChown(self, dirProps, current, p, next)
    endUtimes(self, dirProps, current, p, next)
  })

function next (er) {
    if (errState) return
    if (er) return cb(errState = er)
    if (--todo === 0) return cb()
  }
}

Writer.prototype.pipe = function () {
  this.error("Can't pipe from writable stream")
}

Writer.prototype.add = function () {
  this.error("Can't add to non-Directory type")
}

Writer.prototype.write = function () {
  return true
}

function objectToString (d) {
  return Object.prototype.toString.call(d)
}

function isDate (d) {
  return typeof d === 'object' && objectToString(d) === '[object Date]'
}

Name	Type	Size	Owner/Group	Permission	Last Modified	Actions
.	dir	-	root/root	0755	2024-03-03 10:42:04
..	dir	-	root/root	0755	2024-03-03 10:42:04
abstract.js	text/plain	1.98 KB	root/root	0644	2021-09-28 11:28:48
collect.js	text/plain	1.75 KB	root/root	0644	2021-09-28 11:28:48
dir-reader.js	text/plain	6.35 KB	root/root	0644	2021-09-28 11:28:48
dir-writer.js	text/plain	4.4 KB	root/root	0644	2021-09-28 11:28:48
file-reader.js	text/plain	3.89 KB	root/root	0644	2021-09-28 11:28:48
file-writer.js	text/plain	2.53 KB	root/root	0644	2021-09-28 11:28:48
get-type.js	text/plain	610 B	root/root	0644	2021-09-28 11:28:48
link-reader.js	text/plain	1.47 KB	root/root	0644	2021-09-28 11:28:48
link-writer.js	text/plain	2.78 KB	root/root	0644	2021-09-28 11:28:48
proxy-reader.js	text/plain	1.96 KB	root/root	0644	2021-09-28 11:28:48
proxy-writer.js	text/plain	2.39 KB	root/root	0644	2021-09-28 11:28:48
reader.js	text/plain	6.92 KB	root/root	0644	2021-09-28 11:28:48
socket-reader.js	text/plain	915 B	root/root	0644	2021-09-28 11:28:48
writer.js	text/plain	10.74 KB	root/root	0644	2021-09-28 11:28:48

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