Jason,
Thanks. I haven't seen the update, but was wondering if the crontab
string could be made into a configurable variable read from the config
file, rather than hard coded into the perl script?
If this is too much work for now, or your changes are equivalent, then
ignore my request. It is just that it could be handy for
debugging/testing.
Thanks
Frank
On Wed, 2003-11-26 at 06:06, Jason Brechin wrote:
> Alright... I've made some modifications to sync_users, and this new
> version will be checked into OSCAR after we've released OSCAR 3.0 (very
> very soon). I added support to not modify the crontab file (so that
> manual changes can be made). I fixed the crontab update routine to not
> modify/rewrite the crontab file unless there are changes.
>
> Jason
>
> On Tue, 2003-11-04 at 17:15, Frank Crawford wrote:
> > On Wed, 2003-11-05 at 09:54, Jason Brechin wrote:
> > > On Tue, 2003-11-04 at 16:42, Frank Crawford wrote:
> > > > Jason,
> > > > That is the output mailed to me from the run out of crontab when I took
> > > > off the redirect to /dev/null. When I run it as root, outside of cron,
> > > > it works fine. This is all for the version of sync_users in OSCAR 2.3
> > > > (sync_users-oscar-1.5-5).
> > >
> > > I'm willing to guess that it's due to c3 not handling the
> > > non-interactive shell properly...
> >
> > That's kind of the problem. Who's problem is it, opium (probably not
> > really, it is just affected), c3 (yes, but they are assuming something
> > about cron that works elsewhere) or crontab (ummm ...).
> >
> > > > > sync_users will check to see if it needs to change crontab, it does not
> > > > > change it every time (IIRC). It will change it to what is in the config
> > > > > file. If you want to change its run interval, change sync_users.conf,
> > > > > not /etc/crontab.
> > > >
> > > > No, it rewrites it every time. This is the crontab update routine in
> > > > the sync_users I've installed, which is always called as the last step
> > > > in sync_users:
> > >
> > > Alright... you got me there... it does rewrite it every time. I haven't
> > > looked at the code for quite a while.
> > >
> > > > You can see that every time it rewrites crontab, even if it is only with
> > > > what was previously there. Worse, if you change the sync_users line, it
> > > > puts it back to what it believes is the "correct one".
> > >
> > > This is intentional, since sync_users expects that it is managing the
> > > cron line. I suppose I could add an option to prevent cron updates or
> > > something, but that seems counter-productive. If you need to change the
> > > crontab line you can always edit sync_users and sync_users.conf
> >
> > All I'd really see to do here is not to rewrite the file if there is no
> > change. The rewrite also causes cron to reload the file, adding a (very
> > small) extra overhead in everything. It also does open a small window
> > where /etc/crontab could be corrupted, every 15 mins, when it isn't
> > needed.
> >
> > However, the only change available in sync_users.conf is to change the
> > timing. I wanted to remove the redirection, or following this, add a
> > variable to set USER=$LOGNAME for the sync_users in /etc/crontab. The
> > only place I can find the string defined is in sync_users itself.
> >
> > Is there some configuration option that allows me to change the full
> > line from sync_users.conf? What I wanted is to enter:
> >
> > */15 * * * * root USER=$LOGNAME /opt/opium/bin/sync_users >/dev/null
> > 2>&1
> >
> > which, I think, is a valid workaround for the original problem. But I
> > can't do this without changing sync_user, and as a bit of a purist (or
> > just being pedantic) I'd prefer not to do.
> >
> > > Jason
> >
> > Frank
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