Provide rpmqpack, a fast way to list all installed packages are
check if some package is installed. This is a hack.

--- Makefile.am
+++ Makefile.am
@@ -48,7 +48,7 @@
 bin_SCRIPTS =		gendiff
 
 pkglibdir =		@RPMCONFIGDIR@
-pkglib_PROGRAMS =	rpmb rpmd rpmi rpmk rpmq
+pkglib_PROGRAMS =	rpmb rpmd rpmi rpmk rpmq rpmqpack
 pkglib_DATA =		rpmrc rpmpopt-$(VERSION) macros
 pkglib_SCRIPTS =	find-provides find-requires mkinstalldirs \
 			config.guess config.sub config.site
@@ -98,6 +98,12 @@
 rpm2cpio_LDFLAGS =	$(myLDFLAGS)
 rpm2cpio_LDADD =	$(myLDADD) @LIBMISC@
 
+rpmqpack_SOURCES =	rpmqpack.c
+rpmqpack_LDFLAGS =	$(myLDFLAGS)
+rpmqpack_LDADD =	$(top_builddir)/rpmdb/librpmdb.la \
+			$(top_builddir)/rpmio/librpmio.la \
+			$(top_builddir)/popt/libpopt.la
+
 $(PROGRAMS): 		$(myLDADD) @WITH_APIDOCS_TARGET@
 
 .PHONY:	splint
@@ -147,6 +153,8 @@
 	@LN_S@ ../lib/rpm/rpmv $(DESTDIR)$(bindir)/rpmverify
 	rm -f $(DESTDIR)$(bindir)/rpmsign
 	@LN_S@ ../lib/rpm/rpmk $(DESTDIR)$(bindir)/rpmsign
+	rm -f $(DESTDIR)$(bindir)/rpmqpack
+	@LN_S@ ../lib/rpm/rpmqpack $(DESTDIR)$(bindir)/rpmqpack
 	rm -f $(DESTDIR)$(bindir)/rpmdb ; \
 	@LN_S@ ../lib/rpm/rpmd $(DESTDIR)$(bindir)/rpmdb ; \
 	for bf in e i u ; do \
--- doc/Makefile.am
+++ doc/Makefile.am
@@ -2,6 +2,6 @@
 
 SUBDIRS		= manual fr ja ko pl ru sk
 
-man_MANS	= gendiff.1 rpm.8 rpmbuild.8 rpmcache.8 rpmdeps.8 rpmgraph.8 rpm2cpio.8
+man_MANS	= gendiff.1 rpm.8 rpmbuild.8 rpmcache.8 rpmdeps.8 rpmgraph.8 rpm2cpio.8 rpmqpack.8
 
 EXTRA_DIST	= $(man_MANS)
--- doc/rpmqpack.8
+++ doc/rpmqpack.8
@@ -0,0 +1,25 @@
+.TH RPMQPACK 8 "Mar 2002"
+.SH NAME
+rpmqpack \- check for installed rpm packages
+
+.SH SYNOPSIS
+.B rpmqpack
+.RI [ pack1 "] [" pack2 ]...
+
+.SH DESCRIPTION
+rpmqpack checks if packages given as arguments are installed in
+the system. It prints each installed package to stdout.
+If no arguments are given all installed packages are printed.
+
+.SH EXIT STATUS
+rpmqpack returns 0 if all given packages are installed, otherwise
+1.
+
+.SH SEE ALSO
+.BR rpm (1)
+
+.SH COPYRIGHT
+2002 SuSE Linux AG Nuernberg, Germany.
+
+.SH AUTHOR
+Michael Schroeder <mls@suse.de>
--- rpmqpack.c
+++ rpmqpack.c
@@ -0,0 +1,59 @@
+#include <sys/types.h>
+#include <limits.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <db.h>
+
+DBT key;
+DBT data;
+
+int
+main(int argc, char **argv)
+{
+  DB *db = 0;
+  DBC *dbc = 0;
+  int ret = 0;
+
+  if (db_create(&db, 0, 0))
+    {
+      perror("db_create");
+      exit(1);
+    }
+  if (db->open(db, 0, "/var/lib/rpm/Name", 0, DB_HASH, DB_RDONLY, 0664))
+    {
+      perror("db->open");
+      exit(1);
+    }
+  if (argc == 1)
+    {
+      if (db->cursor(db, NULL, &dbc, 0))
+	{
+	  perror("db->cursor");
+	  exit(1);
+	}
+      while (dbc->c_get(dbc, &key, &data, DB_NEXT) == 0)
+	printf("%*.*s\n", (int)key.size, (int)key.size, (char *)key.data);
+      dbc->c_close(dbc);
+    }
+  else
+    {
+      argc--;
+      while (argc--)
+	{
+	  argv++;
+	  key.data = (void *)*argv;
+	  key.size = strlen(*argv);
+	  data.data = NULL;
+	  data.size = 0;
+	  if (db->get(db, 0, &key, &data, 0) == 0)
+	    printf("%s\n", *argv);
+	  else
+	    ret = 1;
+	}
+    }
+  db->close(db, 0);
+  return ret;
+}