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95 lines
2.8 KiB
95 lines
2.8 KiB
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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