Vendor dependencies with dep

vendor/github.com/pkg/sftp/server_stubs.go

@@ -0,0 +1,12 @@
+// +build !cgo,!plan9 windows android
+
+package sftp
+
+import (
+	"os"
+	"path"
+)
+
+func runLs(dirname string, dirent os.FileInfo) string {
+	return path.Join(dirname, dirent.Name())
+}