You do know that bash --rpm-requires will extract
dependencies for all scriptlets, not just %post and %preun,
automagically for several years now?

If you don't like the executable(...) probe, as in
	Requires: executable(grep)
form of the scriptlet dependencies, then reformat the dependencies  
however you wish
in the extraction script.

And if you really want control over automagic extraction from__ONLY__
%post and %preun, well add some control bits to the macro
that enables/disables
	%_use_internal_dependency_generator

hth

73 de Jeff

On Sep 24, 2008, at 12:14 PM, Alexey M. Tourbin wrote:

> Update of git://git.altlinux.org/people/at/packages/rpm.git
>
> Changes statistics since `4.0.4-alt95.M41.4-7-g3de7779' follows:
>  scripts/find-scriptlet-requires.in |   27 +++++++++++++++++++++++++++
>  1 files changed, 27 insertions(+), 0 deletions(-)
>
> Changelog since `4.0.4-alt95.M41.4-7-g3de7779' follows:
> commit 555b366b2df864b37878a989ce337078555316a4
> Author: Alexey Tourbin <at@altlinux.ru>
> Date:   Wed Sep 24 12:17:39 2008 +0000
>
>     find-scriptlet-requires: describe Requires(post) problem in % 
> post-scripts
>
> Full diff since `4.0.4-alt95.M41.4-7-g3de7779' follows:
> diff --git a/scripts/find-scriptlet-requires.in b/scripts/find- 
> scriptlet-requires.in
> index 85d432e..6d37605 100755
> --- a/scripts/find-scriptlet-requires.in
> +++ b/scripts/find-scriptlet-requires.in
> @@ -77,4 +77,31 @@ RunMethods req "$methods" RunMethod
>  PrintDeps >"$workdir"/deps0
>  if [ -s "$workdir"/deps0 ]; then
>  	cat "$workdir"/deps0
> +else
> +	exit
>  fi
> +
> +# Consider a program which is packaged into a package, and which gets
> +# called in %post or %preun scriptlet of the package (e.g. in  
> libgtk+2,
> +# gtk-update-icon-cache might be called in %post-script).  Packaged
> +# programs have "Requires" dependencies, and, for %post and %preun  
> scripts,
> +# the dependencies on packaged programs are optimized out (as well  
> as other
> +# dependencies provided by the package).  This is a problem: when  
> executing
> +# %post-script, its prerequisites might not be installed yet (e.g.
> +# gtk-update-icon-cache requires recent glib2 version installed/ 
> upgraded
> +# before libgtk+2).
> +
> +# The solution is: 1) to detect all packaged programs (and files),  
> recursively,
> +# which are used in %post-script; and 2) to find prerequisites for  
> such files
> +# and programs (which are not provided by the package itself), and  
> add them to
> +# Requires(post) dependencies.  Also, we want to ensure that 3)  
> the list of
> +# Requires(post) additional dependencies is only a subset of  
> original Requires.
> +
> +# The above applies only to %post and %preun scriptlets.
> +case "${script##*/}" in
> +	.post:* | .preun:* ) ;;
> +	*) exit ;;
> +esac
> +
> +# The above applies only if packaged programs can be used in scripts.
> +[ -s "$RPM_BUILD_ROOT/.files:${RPM_SUBPACKAGE_NAME:?}" ] || exit 0
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