$ git clone -n https://src.fedoraproject.org/rpms/blender.git /var/lib/mock/f39-build-1797061-41763/root/chroot_tmpdir/scmroot/blender
Cloning into '/var/lib/mock/f39-build-1797061-41763/root/chroot_tmpdir/scmroot/blender'...
$ git fetch origin 7d2971dadaebb7c82a808d5a3c79a4315ebd6377:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/blender
 * [new ref]         7d2971dadaebb7c82a808d5a3c79a4315ebd6377 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7d2971d Merge branch 'rawhide' into f39