forked from zhurui/management
96 lines
2.8 KiB
JavaScript
96 lines
2.8 KiB
JavaScript
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module.exports = LinkWriter
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var fs = require('graceful-fs')
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var Writer = require('./writer.js')
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var inherits = require('inherits')
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var path = require('path')
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var rimraf = require('rimraf')
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inherits(LinkWriter, Writer)
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function LinkWriter (props) {
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var self = this
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if (!(self instanceof LinkWriter)) {
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throw new Error('LinkWriter must be called as constructor.')
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}
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// should already be established as a Link type
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if (!((props.type === 'Link' && props.Link) ||
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(props.type === 'SymbolicLink' && props.SymbolicLink))) {
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throw new Error('Non-link type ' + props.type)
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}
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if (props.linkpath === '') props.linkpath = '.'
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if (!props.linkpath) {
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self.error('Need linkpath property to create ' + props.type)
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}
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Writer.call(this, props)
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}
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LinkWriter.prototype._create = function () {
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// console.error(" LW _create")
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var self = this
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var hard = self.type === 'Link' || process.platform === 'win32'
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var link = hard ? 'link' : 'symlink'
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var lp = hard ? path.resolve(self.dirname, self.linkpath) : self.linkpath
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// can only change the link path by clobbering
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// For hard links, let's just assume that's always the case, since
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// there's no good way to read them if we don't already know.
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if (hard) return clobber(self, lp, link)
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fs.readlink(self._path, function (er, p) {
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// only skip creation if it's exactly the same link
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if (p && p === lp) return finish(self)
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clobber(self, lp, link)
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})
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}
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function clobber (self, lp, link) {
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rimraf(self._path, function (er) {
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if (er) return self.error(er)
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create(self, lp, link)
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})
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}
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function create (self, lp, link) {
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fs[link](lp, self._path, function (er) {
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// if this is a hard link, and we're in the process of writing out a
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// directory, it's very possible that the thing we're linking to
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// doesn't exist yet (especially if it was intended as a symlink),
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// so swallow ENOENT errors here and just soldier in.
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// Additionally, an EPERM or EACCES can happen on win32 if it's trying
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// to make a link to a directory. Again, just skip it.
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// A better solution would be to have fs.symlink be supported on
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// windows in some nice fashion.
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if (er) {
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if ((er.code === 'ENOENT' ||
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er.code === 'EACCES' ||
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er.code === 'EPERM') && process.platform === 'win32') {
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self.ready = true
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self.emit('ready')
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self.emit('end')
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self.emit('close')
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self.end = self._finish = function () {}
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} else return self.error(er)
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}
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finish(self)
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})
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}
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function finish (self) {
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self.ready = true
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self.emit('ready')
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if (self._ended && !self._finished) self._finish()
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}
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LinkWriter.prototype.end = function () {
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// console.error("LW finish in end")
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this._ended = true
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if (this.ready) {
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this._finished = true
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this._finish()
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}
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}
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