$ git clone -n https://src.fedoraproject.org/rpms/perl-XML-SAX.git /var/lib/mock/f45-build-27531-624/root/chroot_tmpdir/scmroot/perl-XML-SAX
Cloning into '/var/lib/mock/f45-build-27531-624/root/chroot_tmpdir/scmroot/perl-XML-SAX'...
$ git fetch origin c495d0baa1b894263757eb216dd3181745dd669a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-XML-SAX
 * [new ref]         c495d0baa1b894263757eb216dd3181745dd669a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c495d0b Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild