Fedora 28: Macro %_dracutdir has empty body

[tonyhutter]

System information

Type	Version/Name
Distribution Name	Fedora
Distribution Version	28 rawhide
Linux Kernel
Architecture x86-64
ZFS Version master
SPL Version master

Describe the problem you're observing

I'm unable to build pkg-utils on rawhide with --with-config=srpm:

$ ./autogen.sh && ./configure --with-config=srpm && make pkg-utils
make[3]: Entering directory '/home/hutter/fedora28'
sed -i 's/Release:[[:print:]]*/Release:      379_g272b5d730/' \
	zfs-0.7.0/META
make[3]: Leaving directory '/home/hutter/fedora28'
test -n "" \
|| find "zfs-0.7.0" -type d ! -perm -755 \
	-exec chmod u+rwx,go+rx {} \; -o \
  ! -type d ! -perm -444 -links 1 -exec chmod a+r {} \; -o \
  ! -type d ! -perm -400 -exec chmod a+r {} \; -o \
  ! -type d ! -perm -444 -exec /bin/sh /home/hutter/fedora28/config/install-sh -c -m a+r {} {} \; \
|| chmod -R a+r "zfs-0.7.0"
tardir=zfs-0.7.0 && ${TAR-tar} chof - "$tardir" | eval GZIP= gzip --best -c >zfs-0.7.0.tar.gz
make[2]: Leaving directory '/home/hutter/fedora28'
if test -d "zfs-0.7.0"; then find "zfs-0.7.0" -type d ! -perm -200 -exec chmod u+w {} ';' && rm -rf "zfs-0.7.0" || { sleep 5 && rm -rf "zfs-0.7.0"; }; else :; fi
make[2]: Entering directory '/home/hutter/fedora28'
make[2]: Leaving directory '/home/hutter/fedora28'
Wrote: /tmp/zfs-build-hutter-t97qZumm/SRPMS/zfs-0.7.0-379_g272b5d730.fc28.src.rpm
make[1]: Leaving directory '/home/hutter/fedora28'
make  pkg="zfs" \
	def='--define "_without_debug 1" --define "_without_debuginfo 1" --define "_without_asan 1" --define "_dracutdir " --define "_udevdir " --define "_udevruledir " --define "_initconfdir /etc/sysconfig"  ' rpm-common
make[1]: Entering directory '/home/hutter/fedora28'
make[2]: Entering directory '/home/hutter/fedora28'
make[2]: Leaving directory '/home/hutter/fedora28'
error: Macro %_dracutdir has empty body
make[1]: *** [Makefile:1226: rpm-common] Error 1
make[1]: Leaving directory '/home/hutter/fedora28'
make: *** [Makefile:1185: rpm-utils] Error 2

Describe how to reproduce the problem

./autogen.sh && ./configure --with-config=srpm && make pkg-utils

Include any warning/errors/backtraces from the system logs

[tonyhutter]

This looks to be caused by ZFS_AC_CONFIG_USER not being run for SRPM configs.

        case "$ZFS_CONFIG" in
                kernel) ZFS_AC_CONFIG_KERNEL ;;
                user)   ZFS_AC_CONFIG_USER   ;;
                all)    ZFS_AC_CONFIG_USER
                        ZFS_AC_CONFIG_KERNEL ;;
                srpm)                        ;;
                *)
                AC_MSG_RESULT([Error!])
                AC_MSG_ERROR([Bad value "$ZFS_CONFIG" for --with-config,
                              user kernel|user|all|srpm]) ;;
        esac

ZFS_AC_CONFIG_USER sets _dracutdir via ZFS_AC_CONFIG_USER_DRACUT.