$ git clone -n https://src.fedoraproject.org/rpms/kommit.git /var/lib/mock/f39-build-1698507-41183/root/chroot_tmpdir/scmroot/kommit
Cloning into '/var/lib/mock/f39-build-1698507-41183/root/chroot_tmpdir/scmroot/kommit'...
$ git fetch origin 397f5db218853c13e0424a3d3c9d016b9ca3cd7e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kommit
 * [new ref]         397f5db218853c13e0424a3d3c9d016b9ca3cd7e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 397f5db Added BRs.