%{systemd_svcs} rpm macro bug in zfs-0.7.3-1.el7_4.x86_64.rpm from zfs-kmod repo

[makhomed]

System information

Type	Version/Name
Distribution Name	CentOS
Distribution Version	7.4.1708
Linux Kernel	3.10.0-693.5.2.el7.x86_64
Architecture	x86_64
ZFS Version	0.7.3-1
SPL Version	0.7.3-1

Describe the problem you're observing

RPM postinstall scriptlet and preuninstall scriptlet not work as expected,
macro %{systemd_svcs} not expanded.

Describe how to reproduce the problem

1. enable [zfs-kmod] repo
2. yum install yum-utils
3. run yumdownloader zfs
4. view file zfs-0.7.3-1.el7_4.x86_64.rpm in Midnight Commander, press F3 on this file

As result you will see this:

postinstall scriptlet (using /bin/sh):

if [ $1 -eq 1 ] ; then
        # Initial installation
        systemctl preset %{systemd_svcs} >/dev/null 2>&1 || :
fi
exit 0

preuninstall scriptlet (using /bin/sh):

if [ $1 -eq 0 ] ; then
        # Package removal, not upgrade
        systemctl --no-reload disable %{systemd_svcs} > /dev/null 2>&1 || :
        systemctl stop %{systemd_svcs} > /dev/null 2>&1 || :
fi
exit 0

As you can see, macro %{systemd_svcs} is not expanded,
and systemctl preset will not work as expected:

# systemctl preset %{systemd_svcs}
Failed to execute operation: No such file or directory

%{systemd_svcs} is RPM macro, bash know nothing about it.
%{systemd_svcs} should be expanded in scriptlets to list of services and targets,
as it described in rpm spec:

%define systemd_svcs zfs-import-cache.service zfs-import-scan.service zfs-mount.service zfs-share.service zfs-zed.service zfs.target