this could be handled natively by poldek
but implement as "pm command" hack for now

--- /dev/null	2015-05-20 12:11:30.089022100 +0300
+++ poldek/scripts/pm-command.sh	2015-05-31 18:21:15.748917981 +0300
@@ -0,0 +1,11 @@
+#!/bin/sh
+# wrapper to add pre-install.d and post-install.d support for pm command in poldek
+
+/bin/run-parts /etc/poldek/pre-install.d
+
+/bin/rpm "$@"
+rc=$?
+
+/bin/run-parts /etc/poldek/post-install.d
+
+exit $rc
--- /dev/null	2015-05-20 12:11:30.089022100 +0300
+++ poldek/conf/pre-install.d/README	2015-05-31 18:18:35.539100326 +0300
@@ -0,0 +1,2 @@
+Files in this directory are run before packages are installed, upgraded,
+etc.
--- /dev/null	2015-05-20 12:11:30.089022100 +0300
+++ poldek/conf/post-install.d/README	2015-05-31 18:18:45.883922914 +0300
@@ -0,0 +1 @@
+Files in this directory are run after packages are installed, upgraded, etc.
--- poldek-0.30.1/conf/poldek.conf~	2015-05-31 18:25:35.000000000 +0300
+++ poldek-0.30.1/conf/poldek.conf	2015-05-31 18:26:28.410188923 +0300
@@ -56,7 +56,7 @@
 #exclude path = 
 
 # Full path name to a PM (rpm for now) binary.
-#pm command = /bin/rpm
+pm command = /usr/lib/poldek/pm-command.sh
 
 # Full path name to sudo binary.
 #sudo command = /usr/bin/sudo
--- poldek-0.30.1/conf/Makefile.am	2015-05-31 18:28:29.319806773 +0300
+++ poldek-0.30.1/conf/Makefile.am	2015-05-31 19:12:22.206571793 +0300
@@ -26,6 +26,10 @@

 install-data-local: $(GENCONFIGS)
 	 $(MKDIR_P) $(DESTDIR)$(sysconfdir)/$(PACKAGE)/repos.d
+	 $(MKDIR_P) $(DESTDIR)$(sysconfdir)/$(PACKAGE)/pre-install.d
+	 $(INSTALL_DATA) pre-install.d/README $(DESTDIR)$(sysconfdir)/$(PACKAGE)/pre-install.d
+	 $(MKDIR_P) $(DESTDIR)$(sysconfdir)/$(PACKAGE)/post-install.d
+	 $(INSTALL_DATA) post-install.d/README $(DESTDIR)$(sysconfdir)/$(PACKAGE)/post-install.d
 	 for a in $(CONFIGS); do \
 	 	$(INSTALL_DATA) $(srcdir)/$$a $(DESTDIR)$(sysconfdir)/$(PACKAGE); \
 	 done
--- poldek-0.30.1/Makefile.am~	2014-03-26 00:32:25.000000000 +0200
+++ poldek-0.30.1/Makefile.am	2015-05-31 19:10:22.240340180 +0300
@@ -79,7 +79,7 @@
 LDADD_              = @INTLLIBS@

 vfscriptsdir = $(PKGLIBDIR)
-vfscripts_SCRIPTS = scripts/zlib-in-rpm.sh scripts/vfjuggle scripts/vfcompr scripts/vfsmb scripts/poldekuser-setup.sh
+vfscripts_SCRIPTS = scripts/zlib-in-rpm.sh scripts/vfjuggle scripts/vfcompr scripts/vfsmb scripts/poldekuser-setup.sh scripts/pm-command.sh

 EXTRA_DIST = \
 	     $(vfscripts_SCRIPTS) \