$ git clone -n https://src.fedoraproject.org/rpms/libgxps.git /var/lib/mock/f45-build-16272-485/root/chroot_tmpdir/scmroot/libgxps
Cloning into '/var/lib/mock/f45-build-16272-485/root/chroot_tmpdir/scmroot/libgxps'...
$ git fetch origin 4b453af742138ca4179a5a5fc9b475586f0beac8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libgxps
 * [new ref]         4b453af742138ca4179a5a5fc9b475586f0beac8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4b453af Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild