$ git clone -n https://src.fedoraproject.org/rpms/bluedevil.git /var/lib/mock/f42-build-side-1-3580354-46823/root/chroot_tmpdir/scmroot/bluedevil
Cloning into '/var/lib/mock/f42-build-side-1-3580354-46823/root/chroot_tmpdir/scmroot/bluedevil'...
$ git fetch origin 264be85b9dcec2d850c90b21ad0adeed1aa38a28:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/bluedevil
 * [new ref]         264be85b9dcec2d850c90b21ad0adeed1aa38a28 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 264be85 6.4.1