$ git clone -n https://src.fedoraproject.org/rpms/kcalc.git /var/lib/mock/f38-build-side-42-init-devel-786856-27974/root/chroot_tmpdir/scmroot/kcalc
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-786856-27974/root/chroot_tmpdir/scmroot/kcalc'...
$ git fetch origin b9840d8511cbec6ecbb4f1d69175637857102ce3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kcalc
 * [new ref]         b9840d8511cbec6ecbb4f1d69175637857102ce3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b9840d8 Merge branch 'rawhide' into f38