Description of problem:
authconfig --updateall fails with

Traceback (most recent call last):
  File "/sbin/authconfig", line 585, in <module>
    main()
  File "/sbin/authconfig", line 564, in main
    authcompat = AuthCompat()
  File "/sbin/authconfig", line 435, in __init__
    self.sysconfig = EnvironmentFile(Path.System('authconfig'))
  File "/usr/lib/python3.6/site-packages/authselect/authcompat_EnvironmentFile.py", line 42, in __init__
    self.read()
  File "/usr/lib/python3.6/site-packages/authselect/authcompat_EnvironmentFile.py", line 53, in read
    self.delimiter, self.quotes)
  File "/usr/lib/python3.6/site-packages/authselect/authcompat_EnvironmentFile.py", line 162, in Parse
    value = EnvironmentFile.Line.Unescape(match.group(6), quotes)
  File "/usr/lib/python3.6/site-packages/authselect/authcompat_EnvironmentFile.py", line 207, in Unescape
    if i + 1 >= length(value):
TypeError: 'int' object is not callable


The problem is due to this line:

if i + 1 >= length(value):

It should be this instead:

if i + 1 >= len(value):


Version-Release number of selected component (if applicable): 1.0-3.fc28.x86_64


How reproducible: Always


Steps to Reproduce:
1. From root shell, run authconfig --updateall

Actual results:
Crashes with above error.

Expected results:
Should not crash

Additional info:

Some analysis by other IBMers seems to be that this may be the cause of a problem during F27->F28 upgrade which resulted in /var/run/nologin being regenerated during boot and never cleared, preventing login via VT/sudo/etc. Part of the remediation was to boot in single-user mode and run authselect --updateall which is how I discovered this bug. After fixing the buggy Python code, I was able to run the command and then log in was fixed.