change OS to get pass because of Docker's issue

classes/elphel-misc-functions.bbclass

@@ -24,9 +24,11 @@ def version_update(path,file,evr):
     
 def revision_update(path,file):
     import subprocess, os# , pwd for some reasons  pwd.getpwall() show some 3-user default, so read and parse etc/passwd
+    import getpass
     pef = None # , preexec_fn=pefuid
     if (os.getuid() == 0):
-        uname = os.getlogin()
+        #uname = os.getlogin()
+        uname = getpass.getuser()
         with open("/etc/passwd") as f:
             for line in f:
                 line = line.strip()