Red Hat Bugzilla – Bug 156035
Autofs uses local /etc file map in preference to NIS if one exists
Last modified: 2007-11-30 17:07:07 EST
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Description of problem:
The autofs RPM included in RHEL 3.0 U5 beta (autofs-4.1.3-104) will use a local /etc file map in preference to NIS if one exists, regardless of /etc/nsswitch.conf settings or the configuration of the master map.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. Create an auto.master map (NIS or /etc/auto.master) with an entry for an NIS map. E.g.,
/home auto_home -rw,nosuid,nobrowse,intr
2. Create a file in /etc with the same name as the NIS map. E.g.,
3. Start autofs (service autofs start).
4. Run ps to verify that the automounter is using the /etc map when it should be using the NIS map:
% ps -auxww | fgrep auto_home
root 12687 1.2 0.0 1844 844 tty1 S 14:50 0:00 /usr/sbin/automount --timeout=60 /home file /etc/auto_home -rw,nosuid,nobrowse,intr
Note that it will use the /etc map regardless of the settings in /etc/nsswitch.conf.
Actual Results: The automount executable uses the /etc file map.
Expected Results: The automount executable should use the NIS map.
This may cause unexpected failures for users when they upgrade to U5 if they happen to have old map files sitting in /etc that they expect the automounter to ignore.
The logic in the init script does not appear to have changed. How is this a
change in behaviour from U4?
I just answered my own question. Before if a map name was not an absolute path,
you would just look for it in the current working directory. This was reported
as a bug, and we fixed this by attempting to read it from /etc. Now, because of
this, a failure to find a file map results in success, whereas before you would
fall through to the yp case.
This is tricky. Fix one bug, and you break things for others. The only way to
make everybody happy is to do this the right way (by consulting
/etc/nsswitch.conf). For U5, however, this isn't in the cards. I will attempt
to put this logic after the yp case.
The specific behaviour described in this bug is fixed in autofs-4.1.3-130 as
officially released in RHEL 3.0 U5.
Therefore, this bug should probably be closed.
Whoops. Never mind. Somebody re-imaged my U5 test machine back to U4. This
problem DOES still exist in autofs-4.1.3-130 -- drop a file in /etc with the
same name as an NIS automount map and watch it override the NIS map.
Paul, I think this is a dup of your bug 145152. However, I am going to leave
this bug open, since it documents a regression that has not been addresses in
U5. If this is really causing you pain, please let me know. Otherwise, I'm
going to work on the proper fix for this problem for Update 6.
Same basic bug as 145152. Deferring work.
This issue is on Red Hat Engineering's list of planned work items
for the upcoming Red Hat Enterprise Linux 3.8 release. Engineering
resources have been assigned and barring unforeseen circumstances, Red
Hat intends to include this item in the 3.8 release.
A fix for this issue has just been committed to the RHEL 3 U8 pool. It will be
available in autofs versions 4.1.3-178 and later.
An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on the solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.