$ git clone -n https://src.fedoraproject.org/rpms/libtheora.git /var/lib/mock/f45-build-17086-495/root/chroot_tmpdir/scmroot/libtheora
Cloning into '/var/lib/mock/f45-build-17086-495/root/chroot_tmpdir/scmroot/libtheora'...
$ git fetch origin aaf34ac26d00a0b579e736c12a16e0cd11706624:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libtheora
 * [new ref]         aaf34ac26d00a0b579e736c12a16e0cd11706624 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at aaf34ac Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild