$ git clone -n https://src.fedoraproject.org/rpms/libcddb.git /var/lib/mock/f45-build-15926-480/root/chroot_tmpdir/scmroot/libcddb
Cloning into '/var/lib/mock/f45-build-15926-480/root/chroot_tmpdir/scmroot/libcddb'...
$ git fetch origin d8e78fcb657d9f06fbf6acf84a67c2eb75dab1bf:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libcddb
 * [new ref]         d8e78fcb657d9f06fbf6acf84a67c2eb75dab1bf -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d8e78fc Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild