Recent RPM considers non-zero %post exit status a warning and return a non-zero exit status

build-falsepackage.log

$ ./test.sh 
Created package {:path=>"falsepackage-1.0-1.x86_64.rpm"}
postinstall scriptlet (using /bin/sh):
false
(contains no files)

build-falsepackage.sh

#!/bin/bash

set -e

rm -f falsepackage-1.0-1.x86_64.rpm

echo false > postinst

args=(
	--name falsepackage

	--input-type dir
	--output-type rpm

	--after-install postinst

	--chdir src
	.
)
bundle install --path=.bundle/
bundle exec fpm "${args[@]}"

rpm -qpl --scripts falsepackage-1.0-1.x86_64.rpm

CentOS6.log

[root@centos6-box ~]# rpm --version                                                                                                                                              
RPM version 4.8.0   

[root@centos6-box ~]# rpm -i falsepackage-1.0-1.x86_64.rpm; echo $?
warning: %post(falsepackage-1.0-1.x86_64) scriptlet failed, exit status 1                                                                                                   
0

[root@otrs32 ~]# yum install falsepackage-1.0-1.x86_64.rpm; echo $?
Loaded plugins: fastestmirror, security
Setting up Install Process
Examining falsepackage-1.0-1.x86_64.rpm: falsepackage-1.0-1.x86_64
Marking falsepackage-1.0-1.x86_64.rpm to be installed
Determining fastest mirrors
epel/metalink                                                                                                                                        |  28 kB     00:00     
 * base: mirror1.hs-esslingen.de
 * epel: ftp.uni-bayreuth.de
 * extras: ftp.uni-bayreuth.de
 * updates: centos.mirror.iphh.net
base                                                                                                                                                 | 3.7 kB     00:00     
epel                                                                                                                                                 | 4.7 kB     00:00     
epel/primary_db                                                                                                                                      | 6.0 MB     00:01     
extras                                                                                                                                               | 3.4 kB     00:00     
updates                                                                                                                                              | 3.4 kB     00:00     
Resolving Dependencies
--> Running transaction check
---> Package falsepackage.x86_64 0:1.0-1 will be installed
--> Finished Dependency Resolution

Dependencies Resolved

============================================================================================================================================================================
 Package                                  Arch                               Version                           Repository                                              Size
============================================================================================================================================================================
Installing:
 falsepackage                             x86_64                             1.0-1                             /falsepackage-1.0-1.x86_64                             0.0  

Transaction Summary
============================================================================================================================================================================
Install       1 Package(s)

Installed size: 0  
Is this ok [y/N]: y
Downloading Packages:
Running rpm_check_debug
Running Transaction Test
Transaction Test Succeeded
Running Transaction
  Installing : falsepackage-1.0-1.x86_64                                                                                                                                1/1 
warning: %post(falsepackage-1.0-1.x86_64) scriptlet failed, exit status 1
Non-fatal POSTIN scriptlet failure in rpm package falsepackage-1.0-1.x86_64
  Verifying  : falsepackage-1.0-1.x86_64                                                                                                                                1/1 

Installed:
  falsepackage.x86_64 0:1.0-1                                                                                                                                               

Complete!
0

CentOS7.log

[root@centos7-box ~]# rpm --version
RPM version 4.11.3

[root@centos7-box ~]# rpm -i falsepackage-1.0-1.x86_64.rpm; echo $?
warning: %post(falsepackage-1.0-1.x86_64) scriptlet failed, exit status 1
0

Gemfile

source "https://rubygems.org"

gem "fpm"

SLES11.log

vagrant@sles11-box:~> rpm --version
RPM version 4.4.2.3

vagrant@sles11-box:~> sudo rpm -i /vagrant/falsepackage-1.0-1.x86_64.rpm; echo $?
error: %post(falsepackage-1.0-1.x86_64) scriptlet failed, exit status 1
1

SLES12.log

vagrant@sles12-box:~> rpm --version
RPM version 4.11.2

vagrant@sles12-box:~> sudo rpm -i /vagrant/falsepackage-1.0-1.x86_64.rpm; echo $?
warning: %post(falsepackage-1.0-1.x86_64) scriptlet failed, exit status 1
0