--- lib/rpmscript.c

+++ lib/rpmscript.c

@@ -390,7 +390,7 @@ rpmRC rpmScriptRun(rpmScript script, int

     if (script == NULL) return RPMRC_OK;

     ARGV_t args = NULL;

-    rpmlogLvl lvl = (script->flags & RPMSCRIPT_FLAG_CRITICAL) ?

+    rpmlogLvl lvl = (rpmScriptFlags(script) & RPMSCRIPT_FLAG_CRITICAL) ?

 		    RPMLOG_ERR : RPMLOG_WARNING;

     rpmRC rc;

     int script_type = RPMSCRIPTLET_FORK | RPMSCRIPTLET_EXEC;

@@ -637,5 +637,8 @@ rpmscriptTypes rpmScriptType(rpmScript s

 rpmscriptFlags rpmScriptFlags(rpmScript script)

 {

-    return (script != NULL) ? script->flags : 0;

+    rpmscriptFlags flags = (script != NULL) ? script->flags : 0;

+    if (script && script->tag == RPMTAG_POSTIN && rpmExpandNumeric("%{_fail_on_postinstall_errors}"))

+	flags |= RPMSCRIPT_FLAG_CRITICAL;

+    return flags;

 }

--- macros.in

+++ macros.in

@@ -1293,5 +1293,10 @@ 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

 #*/