Call rpm during rpmbuild

["Richard W.M. Jones" <rjones@xxxxxxxxxx>]

I'm right in thinking that it's bad to call rpm from rpmbuild?

During my find-requires script, I need to get the exact 
name-version-release of the ocaml compiler.  Obviously the compiler 
knows its name & version, but not its release.

At the moment I'm doing:

  if [ -n "$emit_compiler_version" ]; then
      # Every OCaml program depends on the precise version of the
      # compiler which was used to compile it.
      rpm -q --qf '%{NAME} = %{VERSION}-%{RELEASE}\n' ocaml
  fi

but if calling rpm like this is bad, I'm wondering how to fix it.  Best 
way I can see to do this is to store the name-version-release of the 
compiler in a special file in the ocaml RPM, something like:

  /usr/lib64/ocaml/fedora-ocaml-release

which would contain something like 3.09.0-3 or whatever, then the script 
can be changed to cat this file.

What do people think?

Rich.

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