kernel requires

[Jeff Johnson]

On Oct 22, 2007, at 3:54 PM, Elan Ruusamäe wrote:

> %if %{with dist_kernel}
> %requires_releq_kernel
> Requires(postun):   %releq_kernel
> %endif
>
> $ rpm -E %requires_releq_kernel
> Requires: kernel = 3:2.6.22.10-1
> $ rpm -E %releq_kernel
> kernel = 3:2.6.22.10-1
>
> why both are there?
>

Both are there because the flags differ. If the
flags were the same, then rpm would have
collapsed the duplicate:. E.g. the clearly
redundant
      Requires: foo
      Requires: foo
leads to one, not 2, dependencies in a *.rpm.

> if plain requires is there, then (postun) makes no sense
> if only postun is needed, then plain shouldn't be there.
>

All depends on the "preun" context interpretation, which atm
is largely unspecified.

One cannot assume that
     Requires: kernel = 3:2.6.22.10-1
implies
     Requires(postun): kernel = 3:2.6.22.10-1

For perhaps a clearer and more well defined context
usage case example, look at
     Requires(pre)
     Requires(post)
which are both in a "install" context. After installing,
the dependencies are meaningless. And so "install"
dependencies are not indexed in an rpmdb.

hth

73 de Jeff