$ git clone -n https://src.fedoraproject.org/rpms/libva-v4l2-request.git /var/lib/mock/f38-build-side-42-init-devel-1388475-30706/root/chroot_tmpdir/scmroot/libva-v4l2-request
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1388475-30706/root/chroot_tmpdir/scmroot/libva-v4l2-request'...
$ git fetch origin 393593a3c0823553f6361401a6ea0a199273b9d3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libva-v4l2-request
 * [new ref]         393593a3c0823553f6361401a6ea0a199273b9d3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 393593a Rebuilt