diff --git a/lib/pkgfs.lua b/lib/pkgfs.lua
index 81332b5..c8016ba 100644
--- a/lib/pkgfs.lua
+++ b/lib/pkgfs.lua
@@ -99,7 +99,10 @@ function pkgfs.component.close(handle)
 end
 
 function pkgfs.add(fname,comp)
+ local fname = "/"..fnormalize(os.getenv("PWD").."/"..fname)
  local f = fopen(fname,comp)
+ if not fname then error("unable to open file") end
+ print(fname)
  for name, read, fsize in mtar.iter(f) do
   findex[fnormalize(name)] = {fname,comp}
  end