$ git clone -n https://src.fedoraproject.org/rpms/libpipeline.git /var/lib/mock/f45-build-16791-491/root/chroot_tmpdir/scmroot/libpipeline
Cloning into '/var/lib/mock/f45-build-16791-491/root/chroot_tmpdir/scmroot/libpipeline'...
$ git fetch origin a662f50470b54f1e22a1af2fe813322bd5e8a3d0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libpipeline
 * [new ref]         a662f50470b54f1e22a1af2fe813322bd5e8a3d0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a662f50 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild