Re: How to make RPM installation fail if post script fails ?

[John Runyan <johnrunyan1 yahoo com>]

In my case, the %pre only does a pre-condition check. 
Nothing else.  A single RPM is being installed.  Do I
still need the rollback procedure?

--- James Olin Oden <james oden gmail com> wrote:

> On 10/2/06, John Runyan <johnrunyan1 yahoo com>
> wrote:
> > How do you stop RPM installation in the %pre
> section?
> > It shouldn't require the rollback procedure you
> sent a
> > link to, James, should it?
> It absolutely does require that.   The reason is 
> multi-faceted:
> 
>    - Pre-scripts can do things.  They do not have
> the same semanic as a solaris
>      verify script which is only used to check for
> pre-conditions.
>    - Pre-scripts are not all ran at the begining of
> the transaction,
> but as each installed
>      package goes through  the package state machine
> (PSM) its
> pre-scriplet is ran such
>      that the system has necessarily been changes by
> the packages than
> ran before it
>      in the transaction.
>    - scriptlets are opaque to RPM, so there is no
> way to tell if a
> script has changed the
>      system or not.
> 
> When you stack these up you get that at the time of
> a %pre scriptlet
> failure the system could have been changed,
> therefore the transaction
> should be rolled back to bring the system back to
> the original state.
> Note, the therefore is based my environments rule of
> rolling back
> failed transactions.  One could have alternate
> policies.
> 
> Also, another thing to consider that my article does
> not discuss, is
> that sometimes an "upgrade" of a system requires
> multiple transactions
> (at least if you are using the rpm cli).   For
> instance, you might
> have one transaction with kernels and kernel modules
> that were
> installed, and then another with other packages that
> were upgraded.
> By the rules in my enviorment if a %pre failed in
> the second
> transaction, then you would want to roll back that
> transaction and the
> previous one.  That is what the --arbgoal switch is
> about (which is
> not documented), which allow you to specify a roll
> back goal to use in
> the event of a failure.
> 
> Cheers...james
> 
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