Accepting request 477282 from home:wrosenauer:devel

Current Postfix breaks other packages' builds if they are relying on a working postfix configuration in buildroot (e.g. mailman).
Postfix tries to add users and groups w/o the proper requires.
I've converted the current lines with the ones documented currently here:
https://en.opensuse.org/openSUSE:Packaging_guidelines#Users_and_Groups

OBS-URL: https://build.opensuse.org/request/show/477282
OBS-URL: https://build.opensuse.org/package/show/server:mail/postfix?expand=0&rev=254

postfix.changes

@@ -1,3 +1,8 @@
+-------------------------------------------------------------------
+Mon Mar  6 14:04:13 UTC 2017 - wr@rosenauer.org
+
+- make sure that system users can be created in %pre
+
 -------------------------------------------------------------------
 Sat Feb 18 14:01:35 UTC 2017 - kukuk@suse.com
 

postfix.spec

@@ -92,9 +92,11 @@ BuildRequires:  openldap2-devel
 BuildRequires:  pcre-devel
 BuildRequires:  pkgconfig
 BuildRequires:  postgresql-devel
+BuildRequires:  shadow
 Requires:       iproute2
 Requires(pre):  permissions
 Requires(pre):  %fillup_prereq
+Requires(pre):  shadow
 Provides:       smtp_daemon
 BuildRoot:      %{_tmppath}/%{name}-%{version}-build
 Conflicts:      sendmail exim
@@ -396,10 +398,10 @@ if [ -z "$VERSIONTEST" -a -f %{pf_queue_directory}/pid/master.pid ]; then
      exit 1
   fi
 fi
-%{_sbindir}/groupadd -g %{pf_gid} -o -r %{name} 2> /dev/null || :
+getent group %{name} >/dev/null || groupadd -g %{pf_gid} -o -r %{name}
-%{_sbindir}/groupadd -g %{maildrop_gid} -o -r maildrop 2> /dev/null || :
+getent group maildrop >/dev/null || groupadd -g %{maildrop_gid} -o -r maildrop
-%{_sbindir}/useradd  -r -o -g %{name} -u %{pf_uid} -s /bin/false -c "Postfix Daemon" -d /%{pf_queue_directory} %{name} 2> /dev/null || :
+getent passwd %{name} >/dev/null || useradd -r -o -g %{name} -u %{pf_uid} -s /bin/false -c "Postfix Daemon" -d /%{pf_queue_directory} %{name}
-%{_sbindir}/usermod -G %{maildrop_gid},%{mail_gid} %{name} 2> /dev/null || :
+usermod -G %{maildrop_gid},%{mail_gid} %{name}
 # ---------------------------------------------------------------------------
 
 %pre mysql