first commit

build/node_modules/fstream/lib/link-reader.js

@@ -0,0 +1,53 @@
+// 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
+  }
+}