$ git clone -n https://src.fedoraproject.org/rpms/libudfread.git /var/lib/mock/f45-build-17148-496/root/chroot_tmpdir/scmroot/libudfread
Cloning into '/var/lib/mock/f45-build-17148-496/root/chroot_tmpdir/scmroot/libudfread'...
$ git fetch origin d55350673727a8f91dd13a261eeedc5b05f9b2d8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libudfread
 * [new ref]         d55350673727a8f91dd13a261eeedc5b05f9b2d8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d553506 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild