Use systemd sysusers to create saslauth user

Signed-off-by: Simo Sorce <simo@redhat.com>

cyrus-sasl.spec

@@ -1,6 +1,4 @@
 %global username    saslauth
-%global hint        Saslauthd user
-%global homedir     /run/saslauthd
 
 %global _plugindir2 %{_libdir}/sasl2
 %global bootstrap_cyrus_sasl 0
@@ -17,6 +15,7 @@ URL: https://www.cyrusimap.org/sasl/
 # make-no-dlcompatorsrp-tarball.sh removes the "dlcompat" subdirectory and builds a
 # new tarball.
 Source0: cyrus-sasl-%{version}-nodlcompatorsrp.tar.gz
+Source3: saslauth.sysusers
 Source5: saslauthd.service
 Source7: sasl-mechlist.c
 Source9: saslauthd.sysconfig
@@ -25,6 +24,7 @@ Source10: make-no-dlcompatorsrp-tarball.sh
 # https://raw.githubusercontent.com/cyrusimap/cyrus-sasl/master/autogen.sh
 Source11: autogen.sh
 
+
 Requires: %{name}-lib%{?_isa} = %{version}-%{release}
 Patch11: cyrus-sasl-2.1.25-no_rpath.patch
 Patch15: cyrus-sasl-2.1.20-saslauthd.conf-path.patch
@@ -304,6 +304,9 @@ install -m755 -d $RPM_BUILD_ROOT/%{_plugindir2}
 ./libtool --mode=install \
 install -m755 lib/sasl2-shared-mechlist $RPM_BUILD_ROOT/%{_sbindir}/
 
+# Sysusers file
+install -p -D -m 0644 %{SOURCE3} %{buildroot}%{_sysusersdir}/cyrus-sasl.conf
+
 # Remove unpackaged files from the buildroot.
 rm -f $RPM_BUILD_ROOT%{_libdir}/sasl2/libotp.*
 rm -f $RPM_BUILD_ROOT%{_libdir}/sasl2/*.a
@@ -315,8 +318,7 @@ rm -f $RPM_BUILD_ROOT%{_mandir}/cat8/saslauthd.8
 make check %{?_smp_mflags}
 
 %pre
-getent group %{username} >/dev/null || groupadd -g 76 -r %{username}
-getent passwd %{username} >/dev/null || useradd -r -g %{username} -d %{homedir} -s /sbin/nologin -c "%{hint}" %{username}
+%sysusers_create_compat %{SOURCE3}
 
 %post
 %systemd_post saslauthd.service
@@ -338,6 +340,7 @@ getent passwd %{username} >/dev/null || useradd -r -g %{username} -d %{homedir}
 %config(noreplace) /etc/sysconfig/saslauthd
 %{_unitdir}/saslauthd.service
 %ghost /run/saslauthd
+%{_sysusersdir}/cyrus-sasl.conf
 
 %files lib
 %license COPYING

saslauth.sysusers

@@ -0,0 +1,4 @@
+#Type Name       ID     GECOS              Home directory   Shell
+g     saslauth   76
+u     saslauth   -      "Saslauthd user"   /run/saslauthd   /sbin/nologin
+m     saslauth   saslauth