$ git clone -n https://src.fedoraproject.org/rpms/kf5-kjs.git /var/lib/mock/f38-build-716435-96033/root/chroot_tmpdir/scmroot/kf5-kjs
Cloning into '/var/lib/mock/f38-build-716435-96033/root/chroot_tmpdir/scmroot/kf5-kjs'...
$ git fetch origin 00853caa4388060b7a65aa5cae638d668da82a88:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kf5-kjs
 * [new ref]         00853caa4388060b7a65aa5cae638d668da82a88 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 00853ca 5.106.0