$ git clone -n https://src.fedoraproject.org/rpms/perl-XML-Grove.git /var/lib/mock/f45-build-27494-624/root/chroot_tmpdir/scmroot/perl-XML-Grove
Cloning into '/var/lib/mock/f45-build-27494-624/root/chroot_tmpdir/scmroot/perl-XML-Grove'...
$ git fetch origin 975383393b824c02079256758dc8d2ea67e3a8e0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-XML-Grove
 * [new ref]         975383393b824c02079256758dc8d2ea67e3a8e0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9753833 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild