Re: lock

[Wes Hardaker <wjhns1@hardakers.net>]

>>>>> On Sun, 11 Dec 2005 23:44:56 -0500, Phil Shafer <phil@juniper.net> said:

Martin> *  the target configuration is 'candidate' and it has already
Martin> been modified and these changes have not been committed or
Martin> rolled  back.
Martin> 

Martin> What is the purpose of this condition?

Phil> To prevent applications from (a) stealing the lock while a human
Phil> user is in the process of making changes, and (b) preventing the
Phil> script from committing changes which it did not make.

Martin: Note that the case you brought up about a user locking himself
out of his own changes is one of many examples where locking can
actually be misused.  The more interesting cases, IMHO, are the ones
where user B has made changes to the candidate config that user A
isn't allowed to change.  In this case, A can no longer commit the
changes, get a lock, discard the changes, etc.  IE, B doesn't have to
lock the candidate configuration in order to make user A loose all
ability to deal with the candidate configuration set in any useful way.

>>> Then, before committing, A wants to do another change.  So A
>>> tries to grab the lock again - but this will fail since there are
>>> uncommitted changes.

Phil> "A" would have no idea what changes are outstanding when it re-aquired
Phil> the lock.  Its changes could have been discarded, committed, or added
Phil> to.  If you could release the lock with outstanding changes or aquire a
Phil> lock with outstanding changes the application would have no idea of the
Phil> state of the configuration.

Phil> Thanks,
Phil> Phil

Phil> --
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