aaac7fed
 liuqimichale
add
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// 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
}
}
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