$ git clone -n https://src.fedoraproject.org/rpms/xfce4-whiskermenu-plugin.git /var/lib/mock/f45-build-38836-728/root/chroot_tmpdir/scmroot/xfce4-whiskermenu-plugin
Cloning into '/var/lib/mock/f45-build-38836-728/root/chroot_tmpdir/scmroot/xfce4-whiskermenu-plugin'...
$ git fetch origin 797bff427a5e6a76953066047a1c04dcb2b39029:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xfce4-whiskermenu-plugin
 * [new ref]         797bff427a5e6a76953066047a1c04dcb2b39029 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 797bff4 switch from autotools to meson build system