--- ./lib/transaction.c.orig	2018-07-02 14:51:41.328051671 +0000

+++ ./lib/transaction.c	2018-07-02 14:51:46.264038824 +0000

@@ -1462,7 +1462,9 @@ rpmRC runScript(rpmts ts, rpmte te, Head

     int warn_only = (stag != RPMTAG_PREIN &&

 		     stag != RPMTAG_PREUN &&

 		     stag != RPMTAG_PRETRANS &&

-		     stag != RPMTAG_VERIFYSCRIPT);

+		     stag != RPMTAG_VERIFYSCRIPT &&

+		     !(stag == RPMTAG_POSTIN &&

+			rpmExpandNumeric("%{_fail_on_postinstall_errors}")));

     rpmdb rdb = rpmtsGetRdb(ts);

     /* Fake up a transaction element for triggers from rpmdb */

--- ./macros.in.orig	2018-07-02 14:51:41.340051640 +0000

+++ ./macros.in	2018-07-02 14:51:46.264038824 +0000

@@ -1290,5 +1290,10 @@ end}

 %{expand:%__scm_setup_%{__scm} %{!-v:-q}}\

 %{!-N:%autopatch %{-v} %{-p:-p%{-p*}}}

+# Should errors in %post scriptlet be propagated as errors? 

+#

+# Note: set to 1 for legacy compatibility.

+%_fail_on_postinstall_errors  0

+

 # \endverbatim

 #*/