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