On 02/22/2013 09:06 PM, Kevin Knowles wrote:
Hi all,
I have the following dependency structure:
A depends on B depends on C
The dependencies are being set in each RPM as requires. So, A requires B
and B requires C.
When doing a yum install A, I would expect the install order to always be
C, B, A. But we are seeing B being installed before C some times. The
problem is B has a post install script that calls an executable installed
by C. What will I need to set in RPM or Yum to guarantee that C is always
installed before B? I am using RPM v4.8 if that matters.
Simple requires are always sufficient to guarantee install order, unless
there are dependency loops. If B and C order sometimes changes it
indicates a loop between them, ie B requires C and C requires B (whether
its manually or automatically added dependencies doesn't matter)
So you'll want to check the dependencies of C and B packages carefully.
Loops are always best avoided in the first place, but if its not easy to
break up the loop (eg by further splitting up packages) adding a
scriptlet dependency "Requires(post): C" to B will help to cut the loop
in the right direction, as long as there's no "competing" scriptlet
dependency in C.
- Panu -
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