Fix cross-device rename

common/async.js

@@ -72,4 +72,15 @@ function askAsync (rl, q) {
   })
 }
 
-export default {getFiles, promiseExec, askAsync, insertDB}
+function copyAsync (fsrc, fdst) {
+  return new Promise((resolve, reject) => {
+    let source = fs.createReadStream(path.resolve(fsrc))
+    let dest = fs.createWriteStream(path.resolve(fdst))
+
+    source.pipe(dest)
+    source.on('end', resolve)
+    source.on('error', reject)
+  })
+}
+
+export default {getFiles, promiseExec, askAsync, insertDB, copyAsync}

download.js

@@ -49,7 +49,8 @@ async function download (furl) {
   }
 
   let fn = path.join(musicdir, filename)
-  await fs.rename(file.source, fn)
+  await asn.copyAsync(file.source, fn)
+  await fs.unlink(file.source)
 
   let id3 = await asn.promiseExec(`id3 -a "${clean.artist}" -t "${clean.title}" "${fn}"`)