forked from lix-project/lix-website
54 lines
1.5 KiB
JavaScript
54 lines
1.5 KiB
JavaScript
// Basically just a wrapper around an fs.readlink
|
|
//
|
|
// XXX: Enhance this to support the Link type, by keeping
|
|
// a lookup table of {<dev+inode>:<path>}, so that hardlinks
|
|
// can be preserved in tarballs.
|
|
|
|
module.exports = LinkReader
|
|
|
|
var fs = require('graceful-fs')
|
|
var inherits = require('inherits')
|
|
var Reader = require('./reader.js')
|
|
|
|
inherits(LinkReader, Reader)
|
|
|
|
function LinkReader (props) {
|
|
var self = this
|
|
if (!(self instanceof LinkReader)) {
|
|
throw new Error('LinkReader must be called as constructor.')
|
|
}
|
|
|
|
if (!((props.type === 'Link' && props.Link) ||
|
|
(props.type === 'SymbolicLink' && props.SymbolicLink))) {
|
|
throw new Error('Non-link type ' + props.type)
|
|
}
|
|
|
|
Reader.call(self, props)
|
|
}
|
|
|
|
// When piping a LinkReader into a LinkWriter, we have to
|
|
// already have the linkpath property set, so that has to
|
|
// happen *before* the "ready" event, which means we need to
|
|
// override the _stat method.
|
|
LinkReader.prototype._stat = function (currentStat) {
|
|
var self = this
|
|
fs.readlink(self._path, function (er, linkpath) {
|
|
if (er) return self.error(er)
|
|
self.linkpath = self.props.linkpath = linkpath
|
|
self.emit('linkpath', linkpath)
|
|
Reader.prototype._stat.call(self, currentStat)
|
|
})
|
|
}
|
|
|
|
LinkReader.prototype._read = function () {
|
|
var self = this
|
|
if (self._paused) return
|
|
// basically just a no-op, since we got all the info we need
|
|
// from the _stat method
|
|
if (!self._ended) {
|
|
self.emit('end')
|
|
self.emit('close')
|
|
self._ended = true
|
|
}
|
|
}
|