fixed filecap not working in container builder

pym/builder/builder.py

@@ -1212,12 +1212,19 @@ class Builder(Update):
         filecap = getProgPath("/usr/bin/filecap")
         p = process(filecap, chroot_path)
         with writeFile(pathJoin(chroot_path, self.cap_file)) as f:
+            column_shift = 0
             for line in (x.strip() for x in p):
                 if not line or line.startswith("file"):
                     continue
-                fn, caps = line.partition(" ")[::2]
+                if line.startswith("set"):
+                    # we don't need the first column at all
+                    column_shift = 1
+                    continue
+                line_split = line.split()
+                fn = line_split[0 + column_shift]
+                caps = line_split[1 + column_shift:]
                 fn = fn[len(chroot_path):]
-                f.write("%s %s\n"% (fn, " ".join(x.strip() for x in caps.split(","))))
+                f.write("%s %s\n"% (fn, " ".join(x.strip() for x in caps)))
         return True
 
     def clear_file_capabilities(self):